io_uring: import 5.15-stable io_uring

No upstream commit exists.

This imports the io_uring codebase from 5.15.85, wholesale. Changes
from that code base:

- Drop IOCB_ALLOC_CACHE, we don't have that in 5.10.
- Drop MKDIRAT/SYMLINKAT/LINKAT. Would require further VFS backports,
  and we don't support these in 5.10 to begin with.
- sock_from_file() old style calling convention.
- Use compat_get_bitmap() only for CONFIG_COMPAT=y

Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

4 files changed, 0 insertions, 11372 deletions

diff --git a/fs/Makefile b/fs/Makefile
index 999d1a23f036..c660ce28f149 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -32,8 +32,6 @@ obj-$(CONFIG_TIMERFD)		+= timerfd.o
 obj-$(CONFIG_EVENTFD)		+= eventfd.o
 obj-$(CONFIG_USERFAULTFD)	+= userfaultfd.o
 obj-$(CONFIG_AIO)               += aio.o
-obj-$(CONFIG_IO_URING)		+= io_uring.o
-obj-$(CONFIG_IO_WQ)		+= io-wq.o
 obj-$(CONFIG_FS_DAX)		+= dax.o
 obj-$(CONFIG_FS_ENCRYPTION)	+= crypto/
 obj-$(CONFIG_FS_VERITY)		+= verity/
diff --git a/fs/io-wq.c b/fs/io-wq.c
deleted file mode 100644
index 3d5fc76b92d0..000000000000
--- a/fs/io-wq.c
+++ /dev/null
@@ -1,1242 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Basic worker thread pool for io_uring
- *
- * Copyright (C) 2019 Jens Axboe
- *
- */
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/sched/signal.h>
-#include <linux/mm.h>
-#include <linux/sched/mm.h>
-#include <linux/percpu.h>
-#include <linux/slab.h>
-#include <linux/kthread.h>
-#include <linux/rculist_nulls.h>
-#include <linux/fs_struct.h>
-#include <linux/task_work.h>
-#include <linux/blk-cgroup.h>
-#include <linux/audit.h>
-#include <linux/cpu.h>
-
-#include "../kernel/sched/sched.h"
-#include "io-wq.h"
-
-#define WORKER_IDLE_TIMEOUT	(5 * HZ)
-
-enum {
-	IO_WORKER_F_UP		= 1,	/* up and active */
-	IO_WORKER_F_RUNNING	= 2,	/* account as running */
-	IO_WORKER_F_FREE	= 4,	/* worker on free list */
-	IO_WORKER_F_FIXED	= 8,	/* static idle worker */
-	IO_WORKER_F_BOUND	= 16,	/* is doing bounded work */
-};
-
-enum {
-	IO_WQ_BIT_EXIT		= 0,	/* wq exiting */
-	IO_WQ_BIT_CANCEL	= 1,	/* cancel work on list */
-	IO_WQ_BIT_ERROR		= 2,	/* error on setup */
-};
-
-enum {
-	IO_WQE_FLAG_STALLED	= 1,	/* stalled on hash */
-};
-
-/*
- * One for each thread in a wqe pool
- */
-struct io_worker {
-	refcount_t ref;
-	unsigned flags;
-	struct hlist_nulls_node nulls_node;
-	struct list_head all_list;
-	struct task_struct *task;
-	struct io_wqe *wqe;
-
-	struct io_wq_work *cur_work;
-	spinlock_t lock;
-
-	struct rcu_head rcu;
-	struct mm_struct *mm;
-#ifdef CONFIG_BLK_CGROUP
-	struct cgroup_subsys_state *blkcg_css;
-#endif
-	const struct cred *cur_creds;
-	const struct cred *saved_creds;
-	struct files_struct *restore_files;
-	struct nsproxy *restore_nsproxy;
-	struct fs_struct *restore_fs;
-};
-
-#if BITS_PER_LONG == 64
-#define IO_WQ_HASH_ORDER	6
-#else
-#define IO_WQ_HASH_ORDER	5
-#endif
-
-#define IO_WQ_NR_HASH_BUCKETS	(1u << IO_WQ_HASH_ORDER)
-
-struct io_wqe_acct {
-	unsigned nr_workers;
-	unsigned max_workers;
-	atomic_t nr_running;
-};
-
-enum {
-	IO_WQ_ACCT_BOUND,
-	IO_WQ_ACCT_UNBOUND,
-};
-
-/*
- * Per-node worker thread pool
- */
-struct io_wqe {
-	struct {
-		raw_spinlock_t lock;
-		struct io_wq_work_list work_list;
-		unsigned long hash_map;
-		unsigned flags;
-	} ____cacheline_aligned_in_smp;
-
-	int node;
-	struct io_wqe_acct acct[2];
-
-	struct hlist_nulls_head free_list;
-	struct list_head all_list;
-
-	struct io_wq *wq;
-	struct io_wq_work *hash_tail[IO_WQ_NR_HASH_BUCKETS];
-};
-
-/*
- * Per io_wq state
-  */
-struct io_wq {
-	struct io_wqe **wqes;
-	unsigned long state;
-
-	free_work_fn *free_work;
-	io_wq_work_fn *do_work;
-
-	struct task_struct *manager;
-	struct user_struct *user;
-	refcount_t refs;
-	struct completion done;
-
-	struct hlist_node cpuhp_node;
-
-	refcount_t use_refs;
-};
-
-static enum cpuhp_state io_wq_online;
-
-static bool io_worker_get(struct io_worker *worker)
-{
-	return refcount_inc_not_zero(&worker->ref);
-}
-
-static void io_worker_release(struct io_worker *worker)
-{
-	if (refcount_dec_and_test(&worker->ref))
-		wake_up_process(worker->task);
-}
-
-/*
- * Note: drops the wqe->lock if returning true! The caller must re-acquire
- * the lock in that case. Some callers need to restart handling if this
- * happens, so we can't just re-acquire the lock on behalf of the caller.
- */
-static bool __io_worker_unuse(struct io_wqe *wqe, struct io_worker *worker)
-{
-	bool dropped_lock = false;
-
-	if (worker->saved_creds) {
-		revert_creds(worker->saved_creds);
-		worker->cur_creds = worker->saved_creds = NULL;
-	}
-
-	if (current->files != worker->restore_files) {
-		__acquire(&wqe->lock);
-		raw_spin_unlock_irq(&wqe->lock);
-		dropped_lock = true;
-
-		task_lock(current);
-		current->files = worker->restore_files;
-		current->nsproxy = worker->restore_nsproxy;
-		task_unlock(current);
-	}
-
-	if (current->fs != worker->restore_fs)
-		current->fs = worker->restore_fs;
-
-	/*
-	 * If we have an active mm, we need to drop the wq lock before unusing
-	 * it. If we do, return true and let the caller retry the idle loop.
-	 */
-	if (worker->mm) {
-		if (!dropped_lock) {
-			__acquire(&wqe->lock);
-			raw_spin_unlock_irq(&wqe->lock);
-			dropped_lock = true;
-		}
-		__set_current_state(TASK_RUNNING);
-		kthread_unuse_mm(worker->mm);
-		mmput(worker->mm);
-		worker->mm = NULL;
-	}
-
-#ifdef CONFIG_BLK_CGROUP
-	if (worker->blkcg_css) {
-		kthread_associate_blkcg(NULL);
-		worker->blkcg_css = NULL;
-	}
-#endif
-	if (current->signal->rlim[RLIMIT_FSIZE].rlim_cur != RLIM_INFINITY)
-		current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
-	return dropped_lock;
-}
-
-static inline struct io_wqe_acct *io_work_get_acct(struct io_wqe *wqe,
-						   struct io_wq_work *work)
-{
-	if (work->flags & IO_WQ_WORK_UNBOUND)
-		return &wqe->acct[IO_WQ_ACCT_UNBOUND];
-
-	return &wqe->acct[IO_WQ_ACCT_BOUND];
-}
-
-static inline struct io_wqe_acct *io_wqe_get_acct(struct io_wqe *wqe,
-						  struct io_worker *worker)
-{
-	if (worker->flags & IO_WORKER_F_BOUND)
-		return &wqe->acct[IO_WQ_ACCT_BOUND];
-
-	return &wqe->acct[IO_WQ_ACCT_UNBOUND];
-}
-
-static void io_worker_exit(struct io_worker *worker)
-{
-	struct io_wqe *wqe = worker->wqe;
-	struct io_wqe_acct *acct = io_wqe_get_acct(wqe, worker);
-
-	/*
-	 * If we're not at zero, someone else is holding a brief reference
-	 * to the worker. Wait for that to go away.
-	 */
-	set_current_state(TASK_INTERRUPTIBLE);
-	if (!refcount_dec_and_test(&worker->ref))
-		schedule();
-	__set_current_state(TASK_RUNNING);
-
-	preempt_disable();
-	current->flags &= ~PF_IO_WORKER;
-	if (worker->flags & IO_WORKER_F_RUNNING)
-		atomic_dec(&acct->nr_running);
-	if (!(worker->flags & IO_WORKER_F_BOUND))
-		atomic_dec(&wqe->wq->user->processes);
-	worker->flags = 0;
-	preempt_enable();
-
-	raw_spin_lock_irq(&wqe->lock);
-	hlist_nulls_del_rcu(&worker->nulls_node);
-	list_del_rcu(&worker->all_list);
-	if (__io_worker_unuse(wqe, worker)) {
-		__release(&wqe->lock);
-		raw_spin_lock_irq(&wqe->lock);
-	}
-	acct->nr_workers--;
-	raw_spin_unlock_irq(&wqe->lock);
-
-	kfree_rcu(worker, rcu);
-	if (refcount_dec_and_test(&wqe->wq->refs))
-		complete(&wqe->wq->done);
-}
-
-static inline bool io_wqe_run_queue(struct io_wqe *wqe)
-	__must_hold(wqe->lock)
-{
-	if (!wq_list_empty(&wqe->work_list) &&
-	    !(wqe->flags & IO_WQE_FLAG_STALLED))
-		return true;
-	return false;
-}
-
-/*
- * Check head of free list for an available worker. If one isn't available,
- * caller must wake up the wq manager to create one.
- */
-static bool io_wqe_activate_free_worker(struct io_wqe *wqe)
-	__must_hold(RCU)
-{
-	struct hlist_nulls_node *n;
-	struct io_worker *worker;
-
-	n = rcu_dereference(hlist_nulls_first_rcu(&wqe->free_list));
-	if (is_a_nulls(n))
-		return false;
-
-	worker = hlist_nulls_entry(n, struct io_worker, nulls_node);
-	if (io_worker_get(worker)) {
-		wake_up_process(worker->task);
-		io_worker_release(worker);
-		return true;
-	}
-
-	return false;
-}
-
-/*
- * We need a worker. If we find a free one, we're good. If not, and we're
- * below the max number of workers, wake up the manager to create one.
- */
-static void io_wqe_wake_worker(struct io_wqe *wqe, struct io_wqe_acct *acct)
-{
-	bool ret;
-
-	/*
-	 * Most likely an attempt to queue unbounded work on an io_wq that
-	 * wasn't setup with any unbounded workers.
-	 */
-	if (unlikely(!acct->max_workers))
-		pr_warn_once("io-wq is not configured for unbound workers");
-
-	rcu_read_lock();
-	ret = io_wqe_activate_free_worker(wqe);
-	rcu_read_unlock();
-
-	if (!ret && acct->nr_workers < acct->max_workers)
-		wake_up_process(wqe->wq->manager);
-}
-
-static void io_wqe_inc_running(struct io_wqe *wqe, struct io_worker *worker)
-{
-	struct io_wqe_acct *acct = io_wqe_get_acct(wqe, worker);
-
-	atomic_inc(&acct->nr_running);
-}
-
-static void io_wqe_dec_running(struct io_wqe *wqe, struct io_worker *worker)
-	__must_hold(wqe->lock)
-{
-	struct io_wqe_acct *acct = io_wqe_get_acct(wqe, worker);
-
-	if (atomic_dec_and_test(&acct->nr_running) && io_wqe_run_queue(wqe))
-		io_wqe_wake_worker(wqe, acct);
-}
-
-static void io_worker_start(struct io_wqe *wqe, struct io_worker *worker)
-{
-	allow_kernel_signal(SIGINT);
-
-	current->flags |= PF_IO_WORKER;
-
-	worker->flags |= (IO_WORKER_F_UP | IO_WORKER_F_RUNNING);
-	worker->restore_files = current->files;
-	worker->restore_nsproxy = current->nsproxy;
-	worker->restore_fs = current->fs;
-	io_wqe_inc_running(wqe, worker);
-}
-
-/*
- * Worker will start processing some work. Move it to the busy list, if
- * it's currently on the freelist
- */
-static void __io_worker_busy(struct io_wqe *wqe, struct io_worker *worker,
-			     struct io_wq_work *work)
-	__must_hold(wqe->lock)
-{
-	bool worker_bound, work_bound;
-
-	if (worker->flags & IO_WORKER_F_FREE) {
-		worker->flags &= ~IO_WORKER_F_FREE;
-		hlist_nulls_del_init_rcu(&worker->nulls_node);
-	}
-
-	/*
-	 * If worker is moving from bound to unbound (or vice versa), then
-	 * ensure we update the running accounting.
-	 */
-	worker_bound = (worker->flags & IO_WORKER_F_BOUND) != 0;
-	work_bound = (work->flags & IO_WQ_WORK_UNBOUND) == 0;
-	if (worker_bound != work_bound) {
-		io_wqe_dec_running(wqe, worker);
-		if (work_bound) {
-			worker->flags |= IO_WORKER_F_BOUND;
-			wqe->acct[IO_WQ_ACCT_UNBOUND].nr_workers--;
-			wqe->acct[IO_WQ_ACCT_BOUND].nr_workers++;
-			atomic_dec(&wqe->wq->user->processes);
-		} else {
-			worker->flags &= ~IO_WORKER_F_BOUND;
-			wqe->acct[IO_WQ_ACCT_UNBOUND].nr_workers++;
-			wqe->acct[IO_WQ_ACCT_BOUND].nr_workers--;
-			atomic_inc(&wqe->wq->user->processes);
-		}
-		io_wqe_inc_running(wqe, worker);
-	 }
-}
-
-/*
- * No work, worker going to sleep. Move to freelist, and unuse mm if we
- * have one attached. Dropping the mm may potentially sleep, so we drop
- * the lock in that case and return success. Since the caller has to
- * retry the loop in that case (we changed task state), we don't regrab
- * the lock if we return success.
- */
-static bool __io_worker_idle(struct io_wqe *wqe, struct io_worker *worker)
-	__must_hold(wqe->lock)
-{
-	if (!(worker->flags & IO_WORKER_F_FREE)) {
-		worker->flags |= IO_WORKER_F_FREE;
-		hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list);
-	}
-
-	return __io_worker_unuse(wqe, worker);
-}
-
-static inline unsigned int io_get_work_hash(struct io_wq_work *work)
-{
-	return work->flags >> IO_WQ_HASH_SHIFT;
-}
-
-static struct io_wq_work *io_get_next_work(struct io_wqe *wqe)
-	__must_hold(wqe->lock)
-{
-	struct io_wq_work_node *node, *prev;
-	struct io_wq_work *work, *tail;
-	unsigned int hash;
-
-	wq_list_for_each(node, prev, &wqe->work_list) {
-		work = container_of(node, struct io_wq_work, list);
-
-		/* not hashed, can run anytime */
-		if (!io_wq_is_hashed(work)) {
-			wq_list_del(&wqe->work_list, node, prev);
-			return work;
-		}
-
-		/* hashed, can run if not already running */
-		hash = io_get_work_hash(work);
-		if (!(wqe->hash_map & BIT(hash))) {
-			wqe->hash_map |= BIT(hash);
-			/* all items with this hash lie in [work, tail] */
-			tail = wqe->hash_tail[hash];
-			wqe->hash_tail[hash] = NULL;
-			wq_list_cut(&wqe->work_list, &tail->list, prev);
-			return work;
-		}
-	}
-
-	return NULL;
-}
-
-static void io_wq_switch_mm(struct io_worker *worker, struct io_wq_work *work)
-{
-	if (worker->mm) {
-		kthread_unuse_mm(worker->mm);
-		mmput(worker->mm);
-		worker->mm = NULL;
-	}
-
-	if (mmget_not_zero(work->identity->mm)) {
-		kthread_use_mm(work->identity->mm);
-		worker->mm = work->identity->mm;
-		return;
-	}
-
-	/* failed grabbing mm, ensure work gets cancelled */
-	work->flags |= IO_WQ_WORK_CANCEL;
-}
-
-static inline void io_wq_switch_blkcg(struct io_worker *worker,
-				      struct io_wq_work *work)
-{
-#ifdef CONFIG_BLK_CGROUP
-	if (!(work->flags & IO_WQ_WORK_BLKCG))
-		return;
-	if (work->identity->blkcg_css != worker->blkcg_css) {
-		kthread_associate_blkcg(work->identity->blkcg_css);
-		worker->blkcg_css = work->identity->blkcg_css;
-	}
-#endif
-}
-
-static void io_wq_switch_creds(struct io_worker *worker,
-			       struct io_wq_work *work)
-{
-	const struct cred *old_creds = override_creds(work->identity->creds);
-
-	worker->cur_creds = work->identity->creds;
-	if (worker->saved_creds)
-		put_cred(old_creds); /* creds set by previous switch */
-	else
-		worker->saved_creds = old_creds;
-}
-
-static void io_impersonate_work(struct io_worker *worker,
-				struct io_wq_work *work)
-{
-	if ((work->flags & IO_WQ_WORK_FILES) &&
-	    current->files != work->identity->files) {
-		task_lock(current);
-		current->files = work->identity->files;
-		current->nsproxy = work->identity->nsproxy;
-		task_unlock(current);
-		if (!work->identity->files) {
-			/* failed grabbing files, ensure work gets cancelled */
-			work->flags |= IO_WQ_WORK_CANCEL;
-		}
-	}
-	if ((work->flags & IO_WQ_WORK_FS) && current->fs != work->identity->fs)
-		current->fs = work->identity->fs;
-	if ((work->flags & IO_WQ_WORK_MM) && work->identity->mm != worker->mm)
-		io_wq_switch_mm(worker, work);
-	if ((work->flags & IO_WQ_WORK_CREDS) &&
-	    worker->cur_creds != work->identity->creds)
-		io_wq_switch_creds(worker, work);
-	if (work->flags & IO_WQ_WORK_FSIZE)
-		current->signal->rlim[RLIMIT_FSIZE].rlim_cur = work->identity->fsize;
-	else if (current->signal->rlim[RLIMIT_FSIZE].rlim_cur != RLIM_INFINITY)
-		current->signal->rlim[RLIMIT_FSIZE].rlim_cur = RLIM_INFINITY;
-	io_wq_switch_blkcg(worker, work);
-#ifdef CONFIG_AUDIT
-	current->loginuid = work->identity->loginuid;
-	current->sessionid = work->identity->sessionid;
-#endif
-}
-
-static void io_assign_current_work(struct io_worker *worker,
-				   struct io_wq_work *work)
-{
-	if (work) {
-		/* flush pending signals before assigning new work */
-		if (signal_pending(current))
-			flush_signals(current);
-		cond_resched();
-	}
-
-#ifdef CONFIG_AUDIT
-	current->loginuid = KUIDT_INIT(AUDIT_UID_UNSET);
-	current->sessionid = AUDIT_SID_UNSET;
-#endif
-
-	spin_lock_irq(&worker->lock);
-	worker->cur_work = work;
-	spin_unlock_irq(&worker->lock);
-}
-
-static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work);
-
-static void io_worker_handle_work(struct io_worker *worker)
-	__releases(wqe->lock)
-{
-	struct io_wqe *wqe = worker->wqe;
-	struct io_wq *wq = wqe->wq;
-
-	do {
-		struct io_wq_work *work;
-get_next:
-		/*
-		 * If we got some work, mark us as busy. If we didn't, but
-		 * the list isn't empty, it means we stalled on hashed work.
-		 * Mark us stalled so we don't keep looking for work when we
-		 * can't make progress, any work completion or insertion will
-		 * clear the stalled flag.
-		 */
-		work = io_get_next_work(wqe);
-		if (work)
-			__io_worker_busy(wqe, worker, work);
-		else if (!wq_list_empty(&wqe->work_list))
-			wqe->flags |= IO_WQE_FLAG_STALLED;
-
-		raw_spin_unlock_irq(&wqe->lock);
-		if (!work)
-			break;
-		io_assign_current_work(worker, work);
-
-		/* handle a whole dependent link */
-		do {
-			struct io_wq_work *old_work, *next_hashed, *linked;
-			unsigned int hash = io_get_work_hash(work);
-
-			next_hashed = wq_next_work(work);
-			io_impersonate_work(worker, work);
-			/*
-			 * OK to set IO_WQ_WORK_CANCEL even for uncancellable
-			 * work, the worker function will do the right thing.
-			 */
-			if (test_bit(IO_WQ_BIT_CANCEL, &wq->state))
-				work->flags |= IO_WQ_WORK_CANCEL;
-
-			old_work = work;
-			linked = wq->do_work(work);
-
-			work = next_hashed;
-			if (!work && linked && !io_wq_is_hashed(linked)) {
-				work = linked;
-				linked = NULL;
-			}
-			io_assign_current_work(worker, work);
-			wq->free_work(old_work);
-
-			if (linked)
-				io_wqe_enqueue(wqe, linked);
-
-			if (hash != -1U && !next_hashed) {
-				raw_spin_lock_irq(&wqe->lock);
-				wqe->hash_map &= ~BIT_ULL(hash);
-				wqe->flags &= ~IO_WQE_FLAG_STALLED;
-				/* skip unnecessary unlock-lock wqe->lock */
-				if (!work)
-					goto get_next;
-				raw_spin_unlock_irq(&wqe->lock);
-			}
-		} while (work);
-
-		raw_spin_lock_irq(&wqe->lock);
-	} while (1);
-}
-
-static int io_wqe_worker(void *data)
-{
-	struct io_worker *worker = data;
-	struct io_wqe *wqe = worker->wqe;
-	struct io_wq *wq = wqe->wq;
-
-	io_worker_start(wqe, worker);
-
-	while (!test_bit(IO_WQ_BIT_EXIT, &wq->state)) {
-		set_current_state(TASK_INTERRUPTIBLE);
-loop:
-		raw_spin_lock_irq(&wqe->lock);
-		if (io_wqe_run_queue(wqe)) {
-			__set_current_state(TASK_RUNNING);
-			io_worker_handle_work(worker);
-			goto loop;
-		}
-		/* drops the lock on success, retry */
-		if (__io_worker_idle(wqe, worker)) {
-			__release(&wqe->lock);
-			goto loop;
-		}
-		raw_spin_unlock_irq(&wqe->lock);
-		if (signal_pending(current))
-			flush_signals(current);
-		if (schedule_timeout(WORKER_IDLE_TIMEOUT))
-			continue;
-		/* timed out, exit unless we're the fixed worker */
-		if (test_bit(IO_WQ_BIT_EXIT, &wq->state) ||
-		    !(worker->flags & IO_WORKER_F_FIXED))
-			break;
-	}
-
-	if (test_bit(IO_WQ_BIT_EXIT, &wq->state)) {
-		raw_spin_lock_irq(&wqe->lock);
-		if (!wq_list_empty(&wqe->work_list))
-			io_worker_handle_work(worker);
-		else
-			raw_spin_unlock_irq(&wqe->lock);
-	}
-
-	io_worker_exit(worker);
-	return 0;
-}
-
-/*
- * Called when a worker is scheduled in. Mark us as currently running.
- */
-void io_wq_worker_running(struct task_struct *tsk)
-{
-	struct io_worker *worker = kthread_data(tsk);
-	struct io_wqe *wqe = worker->wqe;
-
-	if (!(worker->flags & IO_WORKER_F_UP))
-		return;
-	if (worker->flags & IO_WORKER_F_RUNNING)
-		return;
-	worker->flags |= IO_WORKER_F_RUNNING;
-	io_wqe_inc_running(wqe, worker);
-}
-
-/*
- * Called when worker is going to sleep. If there are no workers currently
- * running and we have work pending, wake up a free one or have the manager
- * set one up.
- */
-void io_wq_worker_sleeping(struct task_struct *tsk)
-{
-	struct io_worker *worker = kthread_data(tsk);
-	struct io_wqe *wqe = worker->wqe;
-
-	if (!(worker->flags & IO_WORKER_F_UP))
-		return;
-	if (!(worker->flags & IO_WORKER_F_RUNNING))
-		return;
-
-	worker->flags &= ~IO_WORKER_F_RUNNING;
-
-	raw_spin_lock_irq(&wqe->lock);
-	io_wqe_dec_running(wqe, worker);
-	raw_spin_unlock_irq(&wqe->lock);
-}
-
-static bool create_io_worker(struct io_wq *wq, struct io_wqe *wqe, int index)
-{
-	struct io_wqe_acct *acct = &wqe->acct[index];
-	struct io_worker *worker;
-
-	worker = kzalloc_node(sizeof(*worker), GFP_KERNEL, wqe->node);
-	if (!worker)
-		return false;
-
-	refcount_set(&worker->ref, 1);
-	worker->nulls_node.pprev = NULL;
-	worker->wqe = wqe;
-	spin_lock_init(&worker->lock);
-
-	worker->task = kthread_create_on_node(io_wqe_worker, worker, wqe->node,
-				"io_wqe_worker-%d/%d", index, wqe->node);
-	if (IS_ERR(worker->task)) {
-		kfree(worker);
-		return false;
-	}
-	kthread_bind_mask(worker->task, cpumask_of_node(wqe->node));
-
-	raw_spin_lock_irq(&wqe->lock);
-	hlist_nulls_add_head_rcu(&worker->nulls_node, &wqe->free_list);
-	list_add_tail_rcu(&worker->all_list, &wqe->all_list);
-	worker->flags |= IO_WORKER_F_FREE;
-	if (index == IO_WQ_ACCT_BOUND)
-		worker->flags |= IO_WORKER_F_BOUND;
-	if (!acct->nr_workers && (worker->flags & IO_WORKER_F_BOUND))
-		worker->flags |= IO_WORKER_F_FIXED;
-	acct->nr_workers++;
-	raw_spin_unlock_irq(&wqe->lock);
-
-	if (index == IO_WQ_ACCT_UNBOUND)
-		atomic_inc(&wq->user->processes);
-
-	refcount_inc(&wq->refs);
-	wake_up_process(worker->task);
-	return true;
-}
-
-static inline bool io_wqe_need_worker(struct io_wqe *wqe, int index)
-	__must_hold(wqe->lock)
-{
-	struct io_wqe_acct *acct = &wqe->acct[index];
-
-	/* if we have available workers or no work, no need */
-	if (!hlist_nulls_empty(&wqe->free_list) || !io_wqe_run_queue(wqe))
-		return false;
-	return acct->nr_workers < acct->max_workers;
-}
-
-static bool io_wqe_worker_send_sig(struct io_worker *worker, void *data)
-{
-	send_sig(SIGINT, worker->task, 1);
-	return false;
-}
-
-/*
- * Iterate the passed in list and call the specific function for each
- * worker that isn't exiting
- */
-static bool io_wq_for_each_worker(struct io_wqe *wqe,
-				  bool (*func)(struct io_worker *, void *),
-				  void *data)
-{
-	struct io_worker *worker;
-	bool ret = false;
-
-	list_for_each_entry_rcu(worker, &wqe->all_list, all_list) {
-		if (io_worker_get(worker)) {
-			/* no task if node is/was offline */
-			if (worker->task)
-				ret = func(worker, data);
-			io_worker_release(worker);
-			if (ret)
-				break;
-		}
-	}
-
-	return ret;
-}
-
-static bool io_wq_worker_wake(struct io_worker *worker, void *data)
-{
-	wake_up_process(worker->task);
-	return false;
-}
-
-/*
- * Manager thread. Tasked with creating new workers, if we need them.
- */
-static int io_wq_manager(void *data)
-{
-	struct io_wq *wq = data;
-	int node;
-
-	/* create fixed workers */
-	refcount_set(&wq->refs, 1);
-	for_each_node(node) {
-		if (!node_online(node))
-			continue;
-		if (create_io_worker(wq, wq->wqes[node], IO_WQ_ACCT_BOUND))
-			continue;
-		set_bit(IO_WQ_BIT_ERROR, &wq->state);
-		set_bit(IO_WQ_BIT_EXIT, &wq->state);
-		goto out;
-	}
-
-	complete(&wq->done);
-
-	while (!kthread_should_stop()) {
-		if (current->task_works)
-			task_work_run();
-
-		for_each_node(node) {
-			struct io_wqe *wqe = wq->wqes[node];
-			bool fork_worker[2] = { false, false };
-
-			if (!node_online(node))
-				continue;
-
-			raw_spin_lock_irq(&wqe->lock);
-			if (io_wqe_need_worker(wqe, IO_WQ_ACCT_BOUND))
-				fork_worker[IO_WQ_ACCT_BOUND] = true;
-			if (io_wqe_need_worker(wqe, IO_WQ_ACCT_UNBOUND))
-				fork_worker[IO_WQ_ACCT_UNBOUND] = true;
-			raw_spin_unlock_irq(&wqe->lock);
-			if (fork_worker[IO_WQ_ACCT_BOUND])
-				create_io_worker(wq, wqe, IO_WQ_ACCT_BOUND);
-			if (fork_worker[IO_WQ_ACCT_UNBOUND])
-				create_io_worker(wq, wqe, IO_WQ_ACCT_UNBOUND);
-		}
-		set_current_state(TASK_INTERRUPTIBLE);
-		schedule_timeout(HZ);
-	}
-
-	if (current->task_works)
-		task_work_run();
-
-out:
-	if (refcount_dec_and_test(&wq->refs)) {
-		complete(&wq->done);
-		return 0;
-	}
-	/* if ERROR is set and we get here, we have workers to wake */
-	if (test_bit(IO_WQ_BIT_ERROR, &wq->state)) {
-		rcu_read_lock();
-		for_each_node(node)
-			io_wq_for_each_worker(wq->wqes[node], io_wq_worker_wake, NULL);
-		rcu_read_unlock();
-	}
-	return 0;
-}
-
-static bool io_wq_can_queue(struct io_wqe *wqe, struct io_wqe_acct *acct,
-			    struct io_wq_work *work)
-{
-	bool free_worker;
-
-	if (!(work->flags & IO_WQ_WORK_UNBOUND))
-		return true;
-	if (atomic_read(&acct->nr_running))
-		return true;
-
-	rcu_read_lock();
-	free_worker = !hlist_nulls_empty(&wqe->free_list);
-	rcu_read_unlock();
-	if (free_worker)
-		return true;
-
-	if (atomic_read(&wqe->wq->user->processes) >= acct->max_workers &&
-	    !(capable(CAP_SYS_RESOURCE) || capable(CAP_SYS_ADMIN)))
-		return false;
-
-	return true;
-}
-
-static void io_run_cancel(struct io_wq_work *work, struct io_wqe *wqe)
-{
-	struct io_wq *wq = wqe->wq;
-
-	do {
-		struct io_wq_work *old_work = work;
-
-		work->flags |= IO_WQ_WORK_CANCEL;
-		work = wq->do_work(work);
-		wq->free_work(old_work);
-	} while (work);
-}
-
-static void io_wqe_insert_work(struct io_wqe *wqe, struct io_wq_work *work)
-{
-	unsigned int hash;
-	struct io_wq_work *tail;
-
-	if (!io_wq_is_hashed(work)) {
-append:
-		wq_list_add_tail(&work->list, &wqe->work_list);
-		return;
-	}
-
-	hash = io_get_work_hash(work);
-	tail = wqe->hash_tail[hash];
-	wqe->hash_tail[hash] = work;
-	if (!tail)
-		goto append;
-
-	wq_list_add_after(&work->list, &tail->list, &wqe->work_list);
-}
-
-static void io_wqe_enqueue(struct io_wqe *wqe, struct io_wq_work *work)
-{
-	struct io_wqe_acct *acct = io_work_get_acct(wqe, work);
-	bool do_wake;
-	unsigned long flags;
-
-	/*
-	 * Do early check to see if we need a new unbound worker, and if we do,
-	 * if we're allowed to do so. This isn't 100% accurate as there's a
-	 * gap between this check and incrementing the value, but that's OK.
-	 * It's close enough to not be an issue, fork() has the same delay.
-	 */
-	if (unlikely(!io_wq_can_queue(wqe, acct, work))) {
-		io_run_cancel(work, wqe);
-		return;
-	}
-
-	raw_spin_lock_irqsave(&wqe->lock, flags);
-	io_wqe_insert_work(wqe, work);
-	wqe->flags &= ~IO_WQE_FLAG_STALLED;
-	do_wake = (work->flags & IO_WQ_WORK_CONCURRENT) ||
-			!atomic_read(&acct->nr_running);
-	raw_spin_unlock_irqrestore(&wqe->lock, flags);
-
-	if (do_wake)
-		io_wqe_wake_worker(wqe, acct);
-}
-
-void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work)
-{
-	struct io_wqe *wqe = wq->wqes[numa_node_id()];
-
-	io_wqe_enqueue(wqe, work);
-}
-
-/*
- * Work items that hash to the same value will not be done in parallel.
- * Used to limit concurrent writes, generally hashed by inode.
- */
-void io_wq_hash_work(struct io_wq_work *work, void *val)
-{
-	unsigned int bit;
-
-	bit = hash_ptr(val, IO_WQ_HASH_ORDER);
-	work->flags |= (IO_WQ_WORK_HASHED | (bit << IO_WQ_HASH_SHIFT));
-}
-
-void io_wq_cancel_all(struct io_wq *wq)
-{
-	int node;
-
-	set_bit(IO_WQ_BIT_CANCEL, &wq->state);
-
-	rcu_read_lock();
-	for_each_node(node) {
-		struct io_wqe *wqe = wq->wqes[node];
-
-		io_wq_for_each_worker(wqe, io_wqe_worker_send_sig, NULL);
-	}
-	rcu_read_unlock();
-}
-
-struct io_cb_cancel_data {
-	work_cancel_fn *fn;
-	void *data;
-	int nr_running;
-	int nr_pending;
-	bool cancel_all;
-};
-
-static bool io_wq_worker_cancel(struct io_worker *worker, void *data)
-{
-	struct io_cb_cancel_data *match = data;
-	unsigned long flags;
-
-	/*
-	 * Hold the lock to avoid ->cur_work going out of scope, caller
-	 * may dereference the passed in work.
-	 */
-	spin_lock_irqsave(&worker->lock, flags);
-	if (worker->cur_work &&
-	    !(worker->cur_work->flags & IO_WQ_WORK_NO_CANCEL) &&
-	    match->fn(worker->cur_work, match->data)) {
-		send_sig(SIGINT, worker->task, 1);
-		match->nr_running++;
-	}
-	spin_unlock_irqrestore(&worker->lock, flags);
-
-	return match->nr_running && !match->cancel_all;
-}
-
-static inline void io_wqe_remove_pending(struct io_wqe *wqe,
-					 struct io_wq_work *work,
-					 struct io_wq_work_node *prev)
-{
-	unsigned int hash = io_get_work_hash(work);
-	struct io_wq_work *prev_work = NULL;
-
-	if (io_wq_is_hashed(work) && work == wqe->hash_tail[hash]) {
-		if (prev)
-			prev_work = container_of(prev, struct io_wq_work, list);
-		if (prev_work && io_get_work_hash(prev_work) == hash)
-			wqe->hash_tail[hash] = prev_work;
-		else
-			wqe->hash_tail[hash] = NULL;
-	}
-	wq_list_del(&wqe->work_list, &work->list, prev);
-}
-
-static void io_wqe_cancel_pending_work(struct io_wqe *wqe,
-				       struct io_cb_cancel_data *match)
-{
-	struct io_wq_work_node *node, *prev;
-	struct io_wq_work *work;
-	unsigned long flags;
-
-retry:
-	raw_spin_lock_irqsave(&wqe->lock, flags);
-	wq_list_for_each(node, prev, &wqe->work_list) {
-		work = container_of(node, struct io_wq_work, list);
-		if (!match->fn(work, match->data))
-			continue;
-		io_wqe_remove_pending(wqe, work, prev);
-		raw_spin_unlock_irqrestore(&wqe->lock, flags);
-		io_run_cancel(work, wqe);
-		match->nr_pending++;
-		if (!match->cancel_all)
-			return;
-
-		/* not safe to continue after unlock */
-		goto retry;
-	}
-	raw_spin_unlock_irqrestore(&wqe->lock, flags);
-}
-
-static void io_wqe_cancel_running_work(struct io_wqe *wqe,
-				       struct io_cb_cancel_data *match)
-{
-	rcu_read_lock();
-	io_wq_for_each_worker(wqe, io_wq_worker_cancel, match);
-	rcu_read_unlock();
-}
-
-enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
-				  void *data, bool cancel_all)
-{
-	struct io_cb_cancel_data match = {
-		.fn		= cancel,
-		.data		= data,
-		.cancel_all	= cancel_all,
-	};
-	int node;
-
-	/*
-	 * First check pending list, if we're lucky we can just remove it
-	 * from there. CANCEL_OK means that the work is returned as-new,
-	 * no completion will be posted for it.
-	 */
-	for_each_node(node) {
-		struct io_wqe *wqe = wq->wqes[node];
-
-		io_wqe_cancel_pending_work(wqe, &match);
-		if (match.nr_pending && !match.cancel_all)
-			return IO_WQ_CANCEL_OK;
-	}
-
-	/*
-	 * Now check if a free (going busy) or busy worker has the work
-	 * currently running. If we find it there, we'll return CANCEL_RUNNING
-	 * as an indication that we attempt to signal cancellation. The
-	 * completion will run normally in this case.
-	 */
-	for_each_node(node) {
-		struct io_wqe *wqe = wq->wqes[node];
-
-		io_wqe_cancel_running_work(wqe, &match);
-		if (match.nr_running && !match.cancel_all)
-			return IO_WQ_CANCEL_RUNNING;
-	}
-
-	if (match.nr_running)
-		return IO_WQ_CANCEL_RUNNING;
-	if (match.nr_pending)
-		return IO_WQ_CANCEL_OK;
-	return IO_WQ_CANCEL_NOTFOUND;
-}
-
-struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data)
-{
-	int ret = -ENOMEM, node;
-	struct io_wq *wq;
-
-	if (WARN_ON_ONCE(!data->free_work || !data->do_work))
-		return ERR_PTR(-EINVAL);
-	if (WARN_ON_ONCE(!bounded))
-		return ERR_PTR(-EINVAL);
-
-	wq = kzalloc(sizeof(*wq), GFP_KERNEL);
-	if (!wq)
-		return ERR_PTR(-ENOMEM);
-
-	wq->wqes = kcalloc(nr_node_ids, sizeof(struct io_wqe *), GFP_KERNEL);
-	if (!wq->wqes)
-		goto err_wq;
-
-	ret = cpuhp_state_add_instance_nocalls(io_wq_online, &wq->cpuhp_node);
-	if (ret)
-		goto err_wqes;
-
-	wq->free_work = data->free_work;
-	wq->do_work = data->do_work;
-
-	/* caller must already hold a reference to this */
-	wq->user = data->user;
-
-	ret = -ENOMEM;
-	for_each_node(node) {
-		struct io_wqe *wqe;
-		int alloc_node = node;
-
-		if (!node_online(alloc_node))
-			alloc_node = NUMA_NO_NODE;
-		wqe = kzalloc_node(sizeof(struct io_wqe), GFP_KERNEL, alloc_node);
-		if (!wqe)
-			goto err;
-		wq->wqes[node] = wqe;
-		wqe->node = alloc_node;
-		wqe->acct[IO_WQ_ACCT_BOUND].max_workers = bounded;
-		atomic_set(&wqe->acct[IO_WQ_ACCT_BOUND].nr_running, 0);
-		if (wq->user) {
-			wqe->acct[IO_WQ_ACCT_UNBOUND].max_workers =
-					task_rlimit(current, RLIMIT_NPROC);
-		}
-		atomic_set(&wqe->acct[IO_WQ_ACCT_UNBOUND].nr_running, 0);
-		wqe->wq = wq;
-		raw_spin_lock_init(&wqe->lock);
-		INIT_WQ_LIST(&wqe->work_list);
-		INIT_HLIST_NULLS_HEAD(&wqe->free_list, 0);
-		INIT_LIST_HEAD(&wqe->all_list);
-	}
-
-	init_completion(&wq->done);
-
-	wq->manager = kthread_create(io_wq_manager, wq, "io_wq_manager");
-	if (!IS_ERR(wq->manager)) {
-		wake_up_process(wq->manager);
-		wait_for_completion(&wq->done);
-		if (test_bit(IO_WQ_BIT_ERROR, &wq->state)) {
-			ret = -ENOMEM;
-			goto err;
-		}
-		refcount_set(&wq->use_refs, 1);
-		reinit_completion(&wq->done);
-		return wq;
-	}
-
-	ret = PTR_ERR(wq->manager);
-	complete(&wq->done);
-err:
-	cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node);
-	for_each_node(node)
-		kfree(wq->wqes[node]);
-err_wqes:
-	kfree(wq->wqes);
-err_wq:
-	kfree(wq);
-	return ERR_PTR(ret);
-}
-
-bool io_wq_get(struct io_wq *wq, struct io_wq_data *data)
-{
-	if (data->free_work != wq->free_work || data->do_work != wq->do_work)
-		return false;
-
-	return refcount_inc_not_zero(&wq->use_refs);
-}
-
-static void __io_wq_destroy(struct io_wq *wq)
-{
-	int node;
-
-	cpuhp_state_remove_instance_nocalls(io_wq_online, &wq->cpuhp_node);
-
-	set_bit(IO_WQ_BIT_EXIT, &wq->state);
-	if (wq->manager)
-		kthread_stop(wq->manager);
-
-	rcu_read_lock();
-	for_each_node(node)
-		io_wq_for_each_worker(wq->wqes[node], io_wq_worker_wake, NULL);
-	rcu_read_unlock();
-
-	wait_for_completion(&wq->done);
-
-	for_each_node(node)
-		kfree(wq->wqes[node]);
-	kfree(wq->wqes);
-	kfree(wq);
-}
-
-void io_wq_destroy(struct io_wq *wq)
-{
-	if (refcount_dec_and_test(&wq->use_refs))
-		__io_wq_destroy(wq);
-}
-
-struct task_struct *io_wq_get_task(struct io_wq *wq)
-{
-	return wq->manager;
-}
-
-static bool io_wq_worker_affinity(struct io_worker *worker, void *data)
-{
-	struct task_struct *task = worker->task;
-	struct rq_flags rf;
-	struct rq *rq;
-
-	rq = task_rq_lock(task, &rf);
-	do_set_cpus_allowed(task, cpumask_of_node(worker->wqe->node));
-	task->flags |= PF_NO_SETAFFINITY;
-	task_rq_unlock(rq, task, &rf);
-	return false;
-}
-
-static int io_wq_cpu_online(unsigned int cpu, struct hlist_node *node)
-{
-	struct io_wq *wq = hlist_entry_safe(node, struct io_wq, cpuhp_node);
-	int i;
-
-	rcu_read_lock();
-	for_each_node(i)
-		io_wq_for_each_worker(wq->wqes[i], io_wq_worker_affinity, NULL);
-	rcu_read_unlock();
-	return 0;
-}
-
-static __init int io_wq_init(void)
-{
-	int ret;
-
-	ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, "io-wq/online",
-					io_wq_cpu_online, NULL);
-	if (ret < 0)
-		return ret;
-	io_wq_online = ret;
-	return 0;
-}
-subsys_initcall(io_wq_init);
diff --git a/fs/io-wq.h b/fs/io-wq.h
deleted file mode 100644
index 75113bcd5889..000000000000
--- a/fs/io-wq.h
+++ /dev/null
@@ -1,157 +0,0 @@
-#ifndef INTERNAL_IO_WQ_H
-#define INTERNAL_IO_WQ_H
-
-#include <linux/io_uring.h>
-
-struct io_wq;
-
-enum {
-	IO_WQ_WORK_CANCEL	= 1,
-	IO_WQ_WORK_HASHED	= 2,
-	IO_WQ_WORK_UNBOUND	= 4,
-	IO_WQ_WORK_NO_CANCEL	= 8,
-	IO_WQ_WORK_CONCURRENT	= 16,
-
-	IO_WQ_WORK_FILES	= 32,
-	IO_WQ_WORK_FS		= 64,
-	IO_WQ_WORK_MM		= 128,
-	IO_WQ_WORK_CREDS	= 256,
-	IO_WQ_WORK_BLKCG	= 512,
-	IO_WQ_WORK_FSIZE	= 1024,
-
-	IO_WQ_HASH_SHIFT	= 24,	/* upper 8 bits are used for hash key */
-};
-
-enum io_wq_cancel {
-	IO_WQ_CANCEL_OK,	/* cancelled before started */
-	IO_WQ_CANCEL_RUNNING,	/* found, running, and attempted cancelled */
-	IO_WQ_CANCEL_NOTFOUND,	/* work not found */
-};
-
-struct io_wq_work_node {
-	struct io_wq_work_node *next;
-};
-
-struct io_wq_work_list {
-	struct io_wq_work_node *first;
-	struct io_wq_work_node *last;
-};
-
-static inline void wq_list_add_after(struct io_wq_work_node *node,
-				     struct io_wq_work_node *pos,
-				     struct io_wq_work_list *list)
-{
-	struct io_wq_work_node *next = pos->next;
-
-	pos->next = node;
-	node->next = next;
-	if (!next)
-		list->last = node;
-}
-
-static inline void wq_list_add_tail(struct io_wq_work_node *node,
-				    struct io_wq_work_list *list)
-{
-	if (!list->first) {
-		list->last = node;
-		WRITE_ONCE(list->first, node);
-	} else {
-		list->last->next = node;
-		list->last = node;
-	}
-	node->next = NULL;
-}
-
-static inline void wq_list_cut(struct io_wq_work_list *list,
-			       struct io_wq_work_node *last,
-			       struct io_wq_work_node *prev)
-{
-	/* first in the list, if prev==NULL */
-	if (!prev)
-		WRITE_ONCE(list->first, last->next);
-	else
-		prev->next = last->next;
-
-	if (last == list->last)
-		list->last = prev;
-	last->next = NULL;
-}
-
-static inline void wq_list_del(struct io_wq_work_list *list,
-			       struct io_wq_work_node *node,
-			       struct io_wq_work_node *prev)
-{
-	wq_list_cut(list, node, prev);
-}
-
-#define wq_list_for_each(pos, prv, head)			\
-	for (pos = (head)->first, prv = NULL; pos; prv = pos, pos = (pos)->next)
-
-#define wq_list_empty(list)	(READ_ONCE((list)->first) == NULL)
-#define INIT_WQ_LIST(list)	do {				\
-	(list)->first = NULL;					\
-	(list)->last = NULL;					\
-} while (0)
-
-struct io_wq_work {
-	struct io_wq_work_node list;
-	struct io_identity *identity;
-	unsigned flags;
-};
-
-static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
-{
-	if (!work->list.next)
-		return NULL;
-
-	return container_of(work->list.next, struct io_wq_work, list);
-}
-
-typedef void (free_work_fn)(struct io_wq_work *);
-typedef struct io_wq_work *(io_wq_work_fn)(struct io_wq_work *);
-
-struct io_wq_data {
-	struct user_struct *user;
-
-	io_wq_work_fn *do_work;
-	free_work_fn *free_work;
-};
-
-struct io_wq *io_wq_create(unsigned bounded, struct io_wq_data *data);
-bool io_wq_get(struct io_wq *wq, struct io_wq_data *data);
-void io_wq_destroy(struct io_wq *wq);
-
-void io_wq_enqueue(struct io_wq *wq, struct io_wq_work *work);
-void io_wq_hash_work(struct io_wq_work *work, void *val);
-
-static inline bool io_wq_is_hashed(struct io_wq_work *work)
-{
-	return work->flags & IO_WQ_WORK_HASHED;
-}
-
-void io_wq_cancel_all(struct io_wq *wq);
-
-typedef bool (work_cancel_fn)(struct io_wq_work *, void *);
-
-enum io_wq_cancel io_wq_cancel_cb(struct io_wq *wq, work_cancel_fn *cancel,
-					void *data, bool cancel_all);
-
-struct task_struct *io_wq_get_task(struct io_wq *wq);
-
-#if defined(CONFIG_IO_WQ)
-extern void io_wq_worker_sleeping(struct task_struct *);
-extern void io_wq_worker_running(struct task_struct *);
-#else
-static inline void io_wq_worker_sleeping(struct task_struct *tsk)
-{
-}
-static inline void io_wq_worker_running(struct task_struct *tsk)
-{
-}
-#endif
-
-static inline bool io_wq_current_is_worker(void)
-{
-	return in_task() && (current->flags & PF_IO_WORKER);
-}
-#endif
diff --git a/fs/io_uring.c b/fs/io_uring.c
deleted file mode 100644
index 1d8173741310..000000000000
--- a/fs/io_uring.c
+++ /dev/null
@@ -1,9971 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Shared application/kernel submission and completion ring pairs, for
- * supporting fast/efficient IO.
- *
- * A note on the read/write ordering memory barriers that are matched between
- * the application and kernel side.
- *
- * After the application reads the CQ ring tail, it must use an
- * appropriate smp_rmb() to pair with the smp_wmb() the kernel uses
- * before writing the tail (using smp_load_acquire to read the tail will
- * do). It also needs a smp_mb() before updating CQ head (ordering the
- * entry load(s) with the head store), pairing with an implicit barrier
- * through a control-dependency in io_get_cqring (smp_store_release to
- * store head will do). Failure to do so could lead to reading invalid
- * CQ entries.
- *
- * Likewise, the application must use an appropriate smp_wmb() before
- * writing the SQ tail (ordering SQ entry stores with the tail store),
- * which pairs with smp_load_acquire in io_get_sqring (smp_store_release
- * to store the tail will do). And it needs a barrier ordering the SQ
- * head load before writing new SQ entries (smp_load_acquire to read
- * head will do).
- *
- * When using the SQ poll thread (IORING_SETUP_SQPOLL), the application
- * needs to check the SQ flags for IORING_SQ_NEED_WAKEUP *after*
- * updating the SQ tail; a full memory barrier smp_mb() is needed
- * between.
- *
- * Also see the examples in the liburing library:
- *
- *	git://git.kernel.dk/liburing
- *
- * io_uring also uses READ/WRITE_ONCE() for _any_ store or load that happens
- * from data shared between the kernel and application. This is done both
- * for ordering purposes, but also to ensure that once a value is loaded from
- * data that the application could potentially modify, it remains stable.
- *
- * Copyright (C) 2018-2019 Jens Axboe
- * Copyright (c) 2018-2019 Christoph Hellwig
- */
-#include <linux/kernel.h>
-#include <linux/init.h>
-#include <linux/errno.h>
-#include <linux/syscalls.h>
-#include <linux/compat.h>
-#include <net/compat.h>
-#include <linux/refcount.h>
-#include <linux/uio.h>
-#include <linux/bits.h>
-
-#include <linux/sched/signal.h>
-#include <linux/fs.h>
-#include <linux/file.h>
-#include <linux/fdtable.h>
-#include <linux/mm.h>
-#include <linux/mman.h>
-#include <linux/percpu.h>
-#include <linux/slab.h>
-#include <linux/kthread.h>
-#include <linux/blkdev.h>
-#include <linux/bvec.h>
-#include <linux/net.h>
-#include <net/sock.h>
-#include <net/af_unix.h>
-#include <net/scm.h>
-#include <linux/anon_inodes.h>
-#include <linux/sched/mm.h>
-#include <linux/uaccess.h>
-#include <linux/nospec.h>
-#include <linux/sizes.h>
-#include <linux/hugetlb.h>
-#include <linux/highmem.h>
-#include <linux/namei.h>
-#include <linux/fsnotify.h>
-#include <linux/fadvise.h>
-#include <linux/eventpoll.h>
-#include <linux/fs_struct.h>
-#include <linux/splice.h>
-#include <linux/task_work.h>
-#include <linux/pagemap.h>
-#include <linux/io_uring.h>
-#include <linux/blk-cgroup.h>
-#include <linux/audit.h>
-
-#define CREATE_TRACE_POINTS
-#include <trace/events/io_uring.h>
-
-#include <uapi/linux/io_uring.h>
-
-#include "internal.h"
-#include "io-wq.h"
-
-#define IORING_MAX_ENTRIES	32768
-#define IORING_MAX_CQ_ENTRIES	(2 * IORING_MAX_ENTRIES)
-
-/*
- * Shift of 9 is 512 entries, or exactly one page on 64-bit archs
- */
-#define IORING_FILE_TABLE_SHIFT	9
-#define IORING_MAX_FILES_TABLE	(1U << IORING_FILE_TABLE_SHIFT)
-#define IORING_FILE_TABLE_MASK	(IORING_MAX_FILES_TABLE - 1)
-#define IORING_MAX_FIXED_FILES	(64 * IORING_MAX_FILES_TABLE)
-#define IORING_MAX_RESTRICTIONS	(IORING_RESTRICTION_LAST + \
-				 IORING_REGISTER_LAST + IORING_OP_LAST)
-
-struct io_uring {
-	u32 head ____cacheline_aligned_in_smp;
-	u32 tail ____cacheline_aligned_in_smp;
-};
-
-/*
- * This data is shared with the application through the mmap at offsets
- * IORING_OFF_SQ_RING and IORING_OFF_CQ_RING.
- *
- * The offsets to the member fields are published through struct
- * io_sqring_offsets when calling io_uring_setup.
- */
-struct io_rings {
-	/*
-	 * Head and tail offsets into the ring; the offsets need to be
-	 * masked to get valid indices.
-	 *
-	 * The kernel controls head of the sq ring and the tail of the cq ring,
-	 * and the application controls tail of the sq ring and the head of the
-	 * cq ring.
-	 */
-	struct io_uring		sq, cq;
-	/*
-	 * Bitmasks to apply to head and tail offsets (constant, equals
-	 * ring_entries - 1)
-	 */
-	u32			sq_ring_mask, cq_ring_mask;
-	/* Ring sizes (constant, power of 2) */
-	u32			sq_ring_entries, cq_ring_entries;
-	/*
-	 * Number of invalid entries dropped by the kernel due to
-	 * invalid index stored in array
-	 *
-	 * Written by the kernel, shouldn't be modified by the
-	 * application (i.e. get number of "new events" by comparing to
-	 * cached value).
-	 *
-	 * After a new SQ head value was read by the application this
-	 * counter includes all submissions that were dropped reaching
-	 * the new SQ head (and possibly more).
-	 */
-	u32			sq_dropped;
-	/*
-	 * Runtime SQ flags
-	 *
-	 * Written by the kernel, shouldn't be modified by the
-	 * application.
-	 *
-	 * The application needs a full memory barrier before checking
-	 * for IORING_SQ_NEED_WAKEUP after updating the sq tail.
-	 */
-	u32			sq_flags;
-	/*
-	 * Runtime CQ flags
-	 *
-	 * Written by the application, shouldn't be modified by the
-	 * kernel.
-	 */
-	u32                     cq_flags;
-	/*
-	 * Number of completion events lost because the queue was full;
-	 * this should be avoided by the application by making sure
-	 * there are not more requests pending than there is space in
-	 * the completion queue.
-	 *
-	 * Written by the kernel, shouldn't be modified by the
-	 * application (i.e. get number of "new events" by comparing to
-	 * cached value).
-	 *
-	 * As completion events come in out of order this counter is not
-	 * ordered with any other data.
-	 */
-	u32			cq_overflow;
-	/*
-	 * Ring buffer of completion events.
-	 *
-	 * The kernel writes completion events fresh every time they are
-	 * produced, so the application is allowed to modify pending
-	 * entries.
-	 */
-	struct io_uring_cqe	cqes[] ____cacheline_aligned_in_smp;
-};
-
-struct io_mapped_ubuf {
-	u64		ubuf;
-	size_t		len;
-	struct		bio_vec *bvec;
-	unsigned int	nr_bvecs;
-	unsigned long	acct_pages;
-};
-
-struct fixed_file_table {
-	struct file		**files;
-};
-
-struct fixed_file_ref_node {
-	struct percpu_ref		refs;
-	struct list_head		node;
-	struct list_head		file_list;
-	struct fixed_file_data		*file_data;
-	struct llist_node		llist;
-	bool				done;
-};
-
-struct fixed_file_data {
-	struct fixed_file_table		*table;
-	struct io_ring_ctx		*ctx;
-
-	struct fixed_file_ref_node	*node;
-	struct percpu_ref		refs;
-	struct completion		done;
-	struct list_head		ref_list;
-	spinlock_t			lock;
-	bool				quiesce;
-};
-
-struct io_buffer {
-	struct list_head list;
-	__u64 addr;
-	__u32 len;
-	__u16 bid;
-};
-
-struct io_restriction {
-	DECLARE_BITMAP(register_op, IORING_REGISTER_LAST);
-	DECLARE_BITMAP(sqe_op, IORING_OP_LAST);
-	u8 sqe_flags_allowed;
-	u8 sqe_flags_required;
-	bool registered;
-};
-
-struct io_sq_data {
-	refcount_t		refs;
-	struct mutex		lock;
-
-	/* ctx's that are using this sqd */
-	struct list_head	ctx_list;
-	struct list_head	ctx_new_list;
-	struct mutex		ctx_lock;
-
-	struct task_struct	*thread;
-	struct wait_queue_head	wait;
-};
-
-struct io_ring_ctx {
-	struct {
-		struct percpu_ref	refs;
-	} ____cacheline_aligned_in_smp;
-
-	struct {
-		unsigned int		flags;
-		unsigned int		compat: 1;
-		unsigned int		limit_mem: 1;
-		unsigned int		cq_overflow_flushed: 1;
-		unsigned int		drain_next: 1;
-		unsigned int		eventfd_async: 1;
-		unsigned int		restricted: 1;
-		unsigned int		sqo_dead: 1;
-
-		/*
-		 * Ring buffer of indices into array of io_uring_sqe, which is
-		 * mmapped by the application using the IORING_OFF_SQES offset.
-		 *
-		 * This indirection could e.g. be used to assign fixed
-		 * io_uring_sqe entries to operations and only submit them to
-		 * the queue when needed.
-		 *
-		 * The kernel modifies neither the indices array nor the entries
-		 * array.
-		 */
-		u32			*sq_array;
-		unsigned		cached_sq_head;
-		unsigned		sq_entries;
-		unsigned		sq_mask;
-		unsigned		sq_thread_idle;
-		unsigned		cached_sq_dropped;
-		unsigned		cached_cq_overflow;
-		unsigned long		sq_check_overflow;
-
-		struct list_head	defer_list;
-		struct list_head	timeout_list;
-		struct list_head	cq_overflow_list;
-
-		struct io_uring_sqe	*sq_sqes;
-	} ____cacheline_aligned_in_smp;
-
-	struct io_rings	*rings;
-
-	/* IO offload */
-	struct io_wq		*io_wq;
-
-	/*
-	 * For SQPOLL usage - we hold a reference to the parent task, so we
-	 * have access to the ->files
-	 */
-	struct task_struct	*sqo_task;
-
-	/* Only used for accounting purposes */
-	struct mm_struct	*mm_account;
-
-#ifdef CONFIG_BLK_CGROUP
-	struct cgroup_subsys_state	*sqo_blkcg_css;
-#endif
-
-	struct io_sq_data	*sq_data;	/* if using sq thread polling */
-
-	struct wait_queue_head	sqo_sq_wait;
-	struct wait_queue_entry	sqo_wait_entry;
-	struct list_head	sqd_list;
-
-	/*
-	 * If used, fixed file set. Writers must ensure that ->refs is dead,
-	 * readers must ensure that ->refs is alive as long as the file* is
-	 * used. Only updated through io_uring_register(2).
-	 */
-	struct fixed_file_data	*file_data;
-	unsigned		nr_user_files;
-
-	/* if used, fixed mapped user buffers */
-	unsigned		nr_user_bufs;
-	struct io_mapped_ubuf	*user_bufs;
-
-	struct user_struct	*user;
-
-	const struct cred	*creds;
-
-#ifdef CONFIG_AUDIT
-	kuid_t			loginuid;
-	unsigned int		sessionid;
-#endif
-
-	struct completion	ref_comp;
-	struct completion	sq_thread_comp;
-
-	/* if all else fails... */
-	struct io_kiocb		*fallback_req;
-
-#if defined(CONFIG_UNIX)
-	struct socket		*ring_sock;
-#endif
-
-	struct xarray		io_buffers;
-
-	struct xarray		personalities;
-	u32			pers_next;
-
-	struct {
-		unsigned		cached_cq_tail;
-		unsigned		cq_entries;
-		unsigned		cq_mask;
-		atomic_t		cq_timeouts;
-		unsigned		cq_last_tm_flush;
-		unsigned long		cq_check_overflow;
-		struct wait_queue_head	cq_wait;
-		struct fasync_struct	*cq_fasync;
-		struct eventfd_ctx	*cq_ev_fd;
-	} ____cacheline_aligned_in_smp;
-
-	struct {
-		struct mutex		uring_lock;
-		wait_queue_head_t	wait;
-	} ____cacheline_aligned_in_smp;
-
-	struct {
-		spinlock_t		completion_lock;
-
-		/*
-		 * ->iopoll_list is protected by the ctx->uring_lock for
-		 * io_uring instances that don't use IORING_SETUP_SQPOLL.
-		 * For SQPOLL, only the single threaded io_sq_thread() will
-		 * manipulate the list, hence no extra locking is needed there.
-		 */
-		struct list_head	iopoll_list;
-		struct hlist_head	*cancel_hash;
-		unsigned		cancel_hash_bits;
-		bool			poll_multi_file;
-
-		spinlock_t		inflight_lock;
-		struct list_head	inflight_list;
-	} ____cacheline_aligned_in_smp;
-
-	struct delayed_work		file_put_work;
-	struct llist_head		file_put_llist;
-
-	struct work_struct		exit_work;
-	struct io_restriction		restrictions;
-};
-
-/*
- * First field must be the file pointer in all the
- * iocb unions! See also 'struct kiocb' in <linux/fs.h>
- */
-struct io_poll_iocb {
-	struct file			*file;
-	union {
-		struct wait_queue_head	*head;
-		u64			addr;
-	};
-	__poll_t			events;
-	bool				done;
-	bool				canceled;
-	struct wait_queue_entry		wait;
-};
-
-struct io_close {
-	struct file			*file;
-	struct file			*put_file;
-	int				fd;
-};
-
-struct io_timeout_data {
-	struct io_kiocb			*req;
-	struct hrtimer			timer;
-	struct timespec64		ts;
-	enum hrtimer_mode		mode;
-};
-
-struct io_accept {
-	struct file			*file;
-	struct sockaddr __user		*addr;
-	int __user			*addr_len;
-	int				flags;
-	unsigned long			nofile;
-};
-
-struct io_sync {
-	struct file			*file;
-	loff_t				len;
-	loff_t				off;
-	int				flags;
-	int				mode;
-};
-
-struct io_cancel {
-	struct file			*file;
-	u64				addr;
-};
-
-struct io_timeout {
-	struct file			*file;
-	u32				off;
-	u32				target_seq;
-	struct list_head		list;
-};
-
-struct io_timeout_rem {
-	struct file			*file;
-	u64				addr;
-};
-
-struct io_rw {
-	/* NOTE: kiocb has the file as the first member, so don't do it here */
-	struct kiocb			kiocb;
-	u64				addr;
-	u64				len;
-};
-
-struct io_connect {
-	struct file			*file;
-	struct sockaddr __user		*addr;
-	int				addr_len;
-};
-
-struct io_sr_msg {
-	struct file			*file;
-	union {
-		struct user_msghdr __user *umsg;
-		void __user		*buf;
-	};
-	int				msg_flags;
-	int				bgid;
-	size_t				len;
-	struct io_buffer		*kbuf;
-};
-
-struct io_open {
-	struct file			*file;
-	int				dfd;
-	bool				ignore_nonblock;
-	struct filename			*filename;
-	struct open_how			how;
-	unsigned long			nofile;
-};
-
-struct io_files_update {
-	struct file			*file;
-	u64				arg;
-	u32				nr_args;
-	u32				offset;
-};
-
-struct io_fadvise {
-	struct file			*file;
-	u64				offset;
-	u32				len;
-	u32				advice;
-};
-
-struct io_madvise {
-	struct file			*file;
-	u64				addr;
-	u32				len;
-	u32				advice;
-};
-
-struct io_epoll {
-	struct file			*file;
-	int				epfd;
-	int				op;
-	int				fd;
-	struct epoll_event		event;
-};
-
-struct io_splice {
-	struct file			*file_out;
-	struct file			*file_in;
-	loff_t				off_out;
-	loff_t				off_in;
-	u64				len;
-	unsigned int			flags;
-};
-
-struct io_provide_buf {
-	struct file			*file;
-	__u64				addr;
-	__u32				len;
-	__u32				bgid;
-	__u16				nbufs;
-	__u16				bid;
-};
-
-struct io_statx {
-	struct file			*file;
-	int				dfd;
-	unsigned int			mask;
-	unsigned int			flags;
-	const char __user		*filename;
-	struct statx __user		*buffer;
-};
-
-struct io_completion {
-	struct file			*file;
-	struct list_head		list;
-	u32				cflags;
-};
-
-struct io_async_connect {
-	struct sockaddr_storage		address;
-};
-
-struct io_async_msghdr {
-	struct iovec			fast_iov[UIO_FASTIOV];
-	struct iovec			*iov;
-	struct sockaddr __user		*uaddr;
-	struct msghdr			msg;
-	struct sockaddr_storage		addr;
-};
-
-struct io_async_rw {
-	struct iovec			fast_iov[UIO_FASTIOV];
-	const struct iovec		*free_iovec;
-	struct iov_iter			iter;
-	size_t				bytes_done;
-	struct wait_page_queue		wpq;
-};
-
-enum {
-	REQ_F_FIXED_FILE_BIT	= IOSQE_FIXED_FILE_BIT,
-	REQ_F_IO_DRAIN_BIT	= IOSQE_IO_DRAIN_BIT,
-	REQ_F_LINK_BIT		= IOSQE_IO_LINK_BIT,
-	REQ_F_HARDLINK_BIT	= IOSQE_IO_HARDLINK_BIT,
-	REQ_F_FORCE_ASYNC_BIT	= IOSQE_ASYNC_BIT,
-	REQ_F_BUFFER_SELECT_BIT	= IOSQE_BUFFER_SELECT_BIT,
-
-	REQ_F_LINK_HEAD_BIT,
-	REQ_F_FAIL_LINK_BIT,
-	REQ_F_INFLIGHT_BIT,
-	REQ_F_CUR_POS_BIT,
-	REQ_F_NOWAIT_BIT,
-	REQ_F_LINK_TIMEOUT_BIT,
-	REQ_F_ISREG_BIT,
-	REQ_F_NEED_CLEANUP_BIT,
-	REQ_F_POLLED_BIT,
-	REQ_F_BUFFER_SELECTED_BIT,
-	REQ_F_NO_FILE_TABLE_BIT,
-	REQ_F_WORK_INITIALIZED_BIT,
-	REQ_F_LTIMEOUT_ACTIVE_BIT,
-
-	/* not a real bit, just to check we're not overflowing the space */
-	__REQ_F_LAST_BIT,
-};
-
-enum {
-	/* ctx owns file */
-	REQ_F_FIXED_FILE	= BIT(REQ_F_FIXED_FILE_BIT),
-	/* drain existing IO first */
-	REQ_F_IO_DRAIN		= BIT(REQ_F_IO_DRAIN_BIT),
-	/* linked sqes */
-	REQ_F_LINK		= BIT(REQ_F_LINK_BIT),
-	/* doesn't sever on completion < 0 */
-	REQ_F_HARDLINK		= BIT(REQ_F_HARDLINK_BIT),
-	/* IOSQE_ASYNC */
-	REQ_F_FORCE_ASYNC	= BIT(REQ_F_FORCE_ASYNC_BIT),
-	/* IOSQE_BUFFER_SELECT */
-	REQ_F_BUFFER_SELECT	= BIT(REQ_F_BUFFER_SELECT_BIT),
-
-	/* head of a link */
-	REQ_F_LINK_HEAD		= BIT(REQ_F_LINK_HEAD_BIT),
-	/* fail rest of links */
-	REQ_F_FAIL_LINK		= BIT(REQ_F_FAIL_LINK_BIT),
-	/* on inflight list */
-	REQ_F_INFLIGHT		= BIT(REQ_F_INFLIGHT_BIT),
-	/* read/write uses file position */
-	REQ_F_CUR_POS		= BIT(REQ_F_CUR_POS_BIT),
-	/* must not punt to workers */
-	REQ_F_NOWAIT		= BIT(REQ_F_NOWAIT_BIT),
-	/* has or had linked timeout */
-	REQ_F_LINK_TIMEOUT	= BIT(REQ_F_LINK_TIMEOUT_BIT),
-	/* regular file */
-	REQ_F_ISREG		= BIT(REQ_F_ISREG_BIT),
-	/* needs cleanup */
-	REQ_F_NEED_CLEANUP	= BIT(REQ_F_NEED_CLEANUP_BIT),
-	/* already went through poll handler */
-	REQ_F_POLLED		= BIT(REQ_F_POLLED_BIT),
-	/* buffer already selected */
-	REQ_F_BUFFER_SELECTED	= BIT(REQ_F_BUFFER_SELECTED_BIT),
-	/* doesn't need file table for this request */
-	REQ_F_NO_FILE_TABLE	= BIT(REQ_F_NO_FILE_TABLE_BIT),
-	/* io_wq_work is initialized */
-	REQ_F_WORK_INITIALIZED	= BIT(REQ_F_WORK_INITIALIZED_BIT),
-	/* linked timeout is active, i.e. prepared by link's head */
-	REQ_F_LTIMEOUT_ACTIVE	= BIT(REQ_F_LTIMEOUT_ACTIVE_BIT),
-};
-
-struct async_poll {
-	struct io_poll_iocb	poll;
-	struct io_poll_iocb	*double_poll;
-};
-
-/*
- * NOTE! Each of the iocb union members has the file pointer
- * as the first entry in their struct definition. So you can
- * access the file pointer through any of the sub-structs,
- * or directly as just 'ki_filp' in this struct.
- */
-struct io_kiocb {
-	union {
-		struct file		*file;
-		struct io_rw		rw;
-		struct io_poll_iocb	poll;
-		struct io_accept	accept;
-		struct io_sync		sync;
-		struct io_cancel	cancel;
-		struct io_timeout	timeout;
-		struct io_timeout_rem	timeout_rem;
-		struct io_connect	connect;
-		struct io_sr_msg	sr_msg;
-		struct io_open		open;
-		struct io_close		close;
-		struct io_files_update	files_update;
-		struct io_fadvise	fadvise;
-		struct io_madvise	madvise;
-		struct io_epoll		epoll;
-		struct io_splice	splice;
-		struct io_provide_buf	pbuf;
-		struct io_statx		statx;
-		/* use only after cleaning per-op data, see io_clean_op() */
-		struct io_completion	compl;
-	};
-
-	/* opcode allocated if it needs to store data for async defer */
-	void				*async_data;
-	u8				opcode;
-	/* polled IO has completed */
-	u8				iopoll_completed;
-
-	u16				buf_index;
-	u32				result;
-
-	struct io_ring_ctx		*ctx;
-	unsigned int			flags;
-	refcount_t			refs;
-	struct task_struct		*task;
-	u64				user_data;
-
-	struct list_head		link_list;
-
-	/*
-	 * 1. used with ctx->iopoll_list with reads/writes
-	 * 2. to track reqs with ->files (see io_op_def::file_table)
-	 */
-	struct list_head		inflight_entry;
-
-	struct list_head		iopoll_entry;
-
-	struct percpu_ref		*fixed_file_refs;
-	struct callback_head		task_work;
-	/* for polled requests, i.e. IORING_OP_POLL_ADD and async armed poll */
-	struct hlist_node		hash_node;
-	struct async_poll		*apoll;
-	struct io_wq_work		work;
-};
-
-struct io_defer_entry {
-	struct list_head	list;
-	struct io_kiocb		*req;
-	u32			seq;
-};
-
-#define IO_IOPOLL_BATCH			8
-
-struct io_comp_state {
-	unsigned int		nr;
-	struct list_head	list;
-	struct io_ring_ctx	*ctx;
-};
-
-struct io_submit_state {
-	struct blk_plug		plug;
-
-	/*
-	 * io_kiocb alloc cache
-	 */
-	void			*reqs[IO_IOPOLL_BATCH];
-	unsigned int		free_reqs;
-
-	/*
-	 * Batch completion logic
-	 */
-	struct io_comp_state	comp;
-
-	/*
-	 * File reference cache
-	 */
-	struct file		*file;
-	unsigned int		fd;
-	unsigned int		has_refs;
-	unsigned int		ios_left;
-};
-
-struct io_op_def {
-	/* needs req->file assigned */
-	unsigned		needs_file : 1;
-	/* don't fail if file grab fails */
-	unsigned		needs_file_no_error : 1;
-	/* hash wq insertion if file is a regular file */
-	unsigned		hash_reg_file : 1;
-	/* unbound wq insertion if file is a non-regular file */
-	unsigned		unbound_nonreg_file : 1;
-	/* opcode is not supported by this kernel */
-	unsigned		not_supported : 1;
-	/* set if opcode supports polled "wait" */
-	unsigned		pollin : 1;
-	unsigned		pollout : 1;
-	/* op supports buffer selection */
-	unsigned		buffer_select : 1;
-	/* must always have async data allocated */
-	unsigned		needs_async_data : 1;
-	/* size of async data needed, if any */
-	unsigned short		async_size;
-	unsigned		work_flags;
-};
-
-static const struct io_op_def io_op_defs[] = {
-	[IORING_OP_NOP] = {},
-	[IORING_OP_READV] = {
-		.needs_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollin			= 1,
-		.buffer_select		= 1,
-		.needs_async_data	= 1,
-		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
-					  IO_WQ_WORK_FILES,
-	},
-	[IORING_OP_WRITEV] = {
-		.needs_file		= 1,
-		.hash_reg_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollout		= 1,
-		.needs_async_data	= 1,
-		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
-					  IO_WQ_WORK_FSIZE | IO_WQ_WORK_FILES,
-	},
-	[IORING_OP_FSYNC] = {
-		.needs_file		= 1,
-		.work_flags		= IO_WQ_WORK_BLKCG,
-	},
-	[IORING_OP_READ_FIXED] = {
-		.needs_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollin			= 1,
-		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_BLKCG | IO_WQ_WORK_MM |
-					  IO_WQ_WORK_FILES,
-	},
-	[IORING_OP_WRITE_FIXED] = {
-		.needs_file		= 1,
-		.hash_reg_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollout		= 1,
-		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE |
-					  IO_WQ_WORK_MM | IO_WQ_WORK_FILES,
-	},
-	[IORING_OP_POLL_ADD] = {
-		.needs_file		= 1,
-		.unbound_nonreg_file	= 1,
-	},
-	[IORING_OP_POLL_REMOVE] = {},
-	[IORING_OP_SYNC_FILE_RANGE] = {
-		.needs_file		= 1,
-		.work_flags		= IO_WQ_WORK_BLKCG,
-	},
-	[IORING_OP_SENDMSG] = {
-		.needs_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollout		= 1,
-		.needs_async_data	= 1,
-		.async_size		= sizeof(struct io_async_msghdr),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
-						IO_WQ_WORK_FS,
-	},
-	[IORING_OP_RECVMSG] = {
-		.needs_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollin			= 1,
-		.buffer_select		= 1,
-		.needs_async_data	= 1,
-		.async_size		= sizeof(struct io_async_msghdr),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
-						IO_WQ_WORK_FS,
-	},
-	[IORING_OP_TIMEOUT] = {
-		.needs_async_data	= 1,
-		.async_size		= sizeof(struct io_timeout_data),
-		.work_flags		= IO_WQ_WORK_MM,
-	},
-	[IORING_OP_TIMEOUT_REMOVE] = {},
-	[IORING_OP_ACCEPT] = {
-		.needs_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollin			= 1,
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_FILES,
-	},
-	[IORING_OP_ASYNC_CANCEL] = {},
-	[IORING_OP_LINK_TIMEOUT] = {
-		.needs_async_data	= 1,
-		.async_size		= sizeof(struct io_timeout_data),
-		.work_flags		= IO_WQ_WORK_MM,
-	},
-	[IORING_OP_CONNECT] = {
-		.needs_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollout		= 1,
-		.needs_async_data	= 1,
-		.async_size		= sizeof(struct io_async_connect),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_FS,
-	},
-	[IORING_OP_FALLOCATE] = {
-		.needs_file		= 1,
-		.work_flags		= IO_WQ_WORK_BLKCG | IO_WQ_WORK_FSIZE,
-	},
-	[IORING_OP_OPENAT] = {
-		.work_flags		= IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG |
-						IO_WQ_WORK_FS,
-	},
-	[IORING_OP_CLOSE] = {
-		.needs_file		= 1,
-		.needs_file_no_error	= 1,
-		.work_flags		= IO_WQ_WORK_FILES | IO_WQ_WORK_BLKCG,
-	},
-	[IORING_OP_FILES_UPDATE] = {
-		.work_flags		= IO_WQ_WORK_FILES | IO_WQ_WORK_MM,
-	},
-	[IORING_OP_STATX] = {
-		.work_flags		= IO_WQ_WORK_FILES | IO_WQ_WORK_MM |
-						IO_WQ_WORK_FS | IO_WQ_WORK_BLKCG,
-	},
-	[IORING_OP_READ] = {
-		.needs_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollin			= 1,
-		.buffer_select		= 1,
-		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
-					  IO_WQ_WORK_FILES,
-	},
-	[IORING_OP_WRITE] = {
-		.needs_file		= 1,
-		.hash_reg_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollout		= 1,
-		.async_size		= sizeof(struct io_async_rw),
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
-					  IO_WQ_WORK_FSIZE | IO_WQ_WORK_FILES,
-	},
-	[IORING_OP_FADVISE] = {
-		.needs_file		= 1,
-		.work_flags		= IO_WQ_WORK_BLKCG,
-	},
-	[IORING_OP_MADVISE] = {
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG,
-	},
-	[IORING_OP_SEND] = {
-		.needs_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollout		= 1,
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
-					  IO_WQ_WORK_FS,
-	},
-	[IORING_OP_RECV] = {
-		.needs_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.pollin			= 1,
-		.buffer_select		= 1,
-		.work_flags		= IO_WQ_WORK_MM | IO_WQ_WORK_BLKCG |
-					  IO_WQ_WORK_FS,
-	},
-	[IORING_OP_OPENAT2] = {
-		.work_flags		= IO_WQ_WORK_FILES | IO_WQ_WORK_FS |
-						IO_WQ_WORK_BLKCG,
-	},
-	[IORING_OP_EPOLL_CTL] = {
-		.unbound_nonreg_file	= 1,
-		.work_flags		= IO_WQ_WORK_FILES,
-	},
-	[IORING_OP_SPLICE] = {
-		.needs_file		= 1,
-		.hash_reg_file		= 1,
-		.unbound_nonreg_file	= 1,
-		.work_flags		= IO_WQ_WORK_BLKCG | IO_WQ_WORK_FILES,
-	},
-	[IORING_OP_PROVIDE_BUFFERS] = {},
-	[IORING_OP_REMOVE_BUFFERS] = {},
-	[IORING_OP_TEE] = {
-		.needs_file		= 1,
-		.hash_reg_file		= 1,
-		.unbound_nonreg_file	= 1,
-	},
-};
-
-enum io_mem_account {
-	ACCT_LOCKED,
-	ACCT_PINNED,
-};
-
-static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node);
-static struct fixed_file_ref_node *alloc_fixed_file_ref_node(
-			struct io_ring_ctx *ctx);
-
-static void __io_complete_rw(struct io_kiocb *req, long res, long res2,
-			     struct io_comp_state *cs);
-static void io_cqring_fill_event(struct io_kiocb *req, long res);
-static void io_put_req(struct io_kiocb *req);
-static void io_put_req_deferred(struct io_kiocb *req, int nr);
-static void io_double_put_req(struct io_kiocb *req);
-static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req);
-static void __io_queue_linked_timeout(struct io_kiocb *req);
-static void io_queue_linked_timeout(struct io_kiocb *req);
-static int __io_sqe_files_update(struct io_ring_ctx *ctx,
-				 struct io_uring_files_update *ip,
-				 unsigned nr_args);
-static void __io_clean_op(struct io_kiocb *req);
-static struct file *io_file_get(struct io_submit_state *state,
-				struct io_kiocb *req, int fd, bool fixed);
-static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs);
-static void io_file_put_work(struct work_struct *work);
-
-static ssize_t io_import_iovec(int rw, struct io_kiocb *req,
-			       struct iovec **iovec, struct iov_iter *iter,
-			       bool needs_lock);
-static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec,
-			     const struct iovec *fast_iov,
-			     struct iov_iter *iter, bool force);
-static void io_req_drop_files(struct io_kiocb *req);
-static void io_req_task_queue(struct io_kiocb *req);
-
-static struct kmem_cache *req_cachep;
-
-static const struct file_operations io_uring_fops;
-
-struct sock *io_uring_get_socket(struct file *file)
-{
-#if defined(CONFIG_UNIX)
-	if (file->f_op == &io_uring_fops) {
-		struct io_ring_ctx *ctx = file->private_data;
-
-		return ctx->ring_sock->sk;
-	}
-#endif
-	return NULL;
-}
-EXPORT_SYMBOL(io_uring_get_socket);
-
-static inline void io_clean_op(struct io_kiocb *req)
-{
-	if (req->flags & (REQ_F_NEED_CLEANUP | REQ_F_BUFFER_SELECTED))
-		__io_clean_op(req);
-}
-
-static inline bool __io_match_files(struct io_kiocb *req,
-				    struct files_struct *files)
-{
-	if (req->file && req->file->f_op == &io_uring_fops)
-		return true;
-
-	return ((req->flags & REQ_F_WORK_INITIALIZED) &&
-	        (req->work.flags & IO_WQ_WORK_FILES)) &&
-		req->work.identity->files == files;
-}
-
-static void io_refs_resurrect(struct percpu_ref *ref, struct completion *compl)
-{
-	bool got = percpu_ref_tryget(ref);
-
-	/* already at zero, wait for ->release() */
-	if (!got)
-		wait_for_completion(compl);
-	percpu_ref_resurrect(ref);
-	if (got)
-		percpu_ref_put(ref);
-}
-
-static bool io_match_task(struct io_kiocb *head,
-			  struct task_struct *task,
-			  struct files_struct *files)
-{
-	struct io_kiocb *link;
-
-	if (task && head->task != task) {
-		/* in terms of cancelation, always match if req task is dead */
-		if (head->task->flags & PF_EXITING)
-			return true;
-		return false;
-	}
-	if (!files)
-		return true;
-	if (__io_match_files(head, files))
-		return true;
-	if (head->flags & REQ_F_LINK_HEAD) {
-		list_for_each_entry(link, &head->link_list, link_list) {
-			if (__io_match_files(link, files))
-				return true;
-		}
-	}
-	return false;
-}
-
-
-static void io_sq_thread_drop_mm(void)
-{
-	struct mm_struct *mm = current->mm;
-
-	if (mm) {
-		kthread_unuse_mm(mm);
-		mmput(mm);
-		current->mm = NULL;
-	}
-}
-
-static int __io_sq_thread_acquire_mm(struct io_ring_ctx *ctx)
-{
-	struct mm_struct *mm;
-
-	if (current->flags & PF_EXITING)
-		return -EFAULT;
-	if (current->mm)
-		return 0;
-
-	/* Should never happen */
-	if (unlikely(!(ctx->flags & IORING_SETUP_SQPOLL)))
-		return -EFAULT;
-
-	task_lock(ctx->sqo_task);
-	mm = ctx->sqo_task->mm;
-	if (unlikely(!mm || !mmget_not_zero(mm)))
-		mm = NULL;
-	task_unlock(ctx->sqo_task);
-
-	if (mm) {
-		kthread_use_mm(mm);
-		return 0;
-	}
-
-	return -EFAULT;
-}
-
-static int io_sq_thread_acquire_mm(struct io_ring_ctx *ctx,
-				   struct io_kiocb *req)
-{
-	if (!(io_op_defs[req->opcode].work_flags & IO_WQ_WORK_MM))
-		return 0;
-	return __io_sq_thread_acquire_mm(ctx);
-}
-
-static void io_sq_thread_associate_blkcg(struct io_ring_ctx *ctx,
-					 struct cgroup_subsys_state **cur_css)
-
-{
-#ifdef CONFIG_BLK_CGROUP
-	/* puts the old one when swapping */
-	if (*cur_css != ctx->sqo_blkcg_css) {
-		kthread_associate_blkcg(ctx->sqo_blkcg_css);
-		*cur_css = ctx->sqo_blkcg_css;
-	}
-#endif
-}
-
-static void io_sq_thread_unassociate_blkcg(void)
-{
-#ifdef CONFIG_BLK_CGROUP
-	kthread_associate_blkcg(NULL);
-#endif
-}
-
-static inline void req_set_fail_links(struct io_kiocb *req)
-{
-	if ((req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) == REQ_F_LINK)
-		req->flags |= REQ_F_FAIL_LINK;
-}
-
-/*
- * None of these are dereferenced, they are simply used to check if any of
- * them have changed. If we're under current and check they are still the
- * same, we're fine to grab references to them for actual out-of-line use.
- */
-static void io_init_identity(struct io_identity *id)
-{
-	id->files = current->files;
-	id->mm = current->mm;
-#ifdef CONFIG_BLK_CGROUP
-	rcu_read_lock();
-	id->blkcg_css = blkcg_css();
-	rcu_read_unlock();
-#endif
-	id->creds = current_cred();
-	id->nsproxy = current->nsproxy;
-	id->fs = current->fs;
-	id->fsize = rlimit(RLIMIT_FSIZE);
-#ifdef CONFIG_AUDIT
-	id->loginuid = current->loginuid;
-	id->sessionid = current->sessionid;
-#endif
-	refcount_set(&id->count, 1);
-}
-
-static inline void __io_req_init_async(struct io_kiocb *req)
-{
-	memset(&req->work, 0, sizeof(req->work));
-	req->flags |= REQ_F_WORK_INITIALIZED;
-}
-
-/*
- * Note: must call io_req_init_async() for the first time you
- * touch any members of io_wq_work.
- */
-static inline void io_req_init_async(struct io_kiocb *req)
-{
-	struct io_uring_task *tctx = req->task->io_uring;
-
-	if (req->flags & REQ_F_WORK_INITIALIZED)
-		return;
-
-	__io_req_init_async(req);
-
-	/* Grab a ref if this isn't our static identity */
-	req->work.identity = tctx->identity;
-	if (tctx->identity != &tctx->__identity)
-		refcount_inc(&req->work.identity->count);
-}
-
-static inline bool io_async_submit(struct io_ring_ctx *ctx)
-{
-	return ctx->flags & IORING_SETUP_SQPOLL;
-}
-
-static void io_ring_ctx_ref_free(struct percpu_ref *ref)
-{
-	struct io_ring_ctx *ctx = container_of(ref, struct io_ring_ctx, refs);
-
-	complete(&ctx->ref_comp);
-}
-
-static inline bool io_is_timeout_noseq(struct io_kiocb *req)
-{
-	return !req->timeout.off;
-}
-
-static struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
-{
-	struct io_ring_ctx *ctx;
-	int hash_bits;
-
-	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
-	if (!ctx)
-		return NULL;
-
-	ctx->fallback_req = kmem_cache_alloc(req_cachep, GFP_KERNEL);
-	if (!ctx->fallback_req)
-		goto err;
-
-	/*
-	 * Use 5 bits less than the max cq entries, that should give us around
-	 * 32 entries per hash list if totally full and uniformly spread.
-	 */
-	hash_bits = ilog2(p->cq_entries);
-	hash_bits -= 5;
-	if (hash_bits <= 0)
-		hash_bits = 1;
-	ctx->cancel_hash_bits = hash_bits;
-	ctx->cancel_hash = kmalloc((1U << hash_bits) * sizeof(struct hlist_head),
-					GFP_KERNEL);
-	if (!ctx->cancel_hash)
-		goto err;
-	__hash_init(ctx->cancel_hash, 1U << hash_bits);
-
-	if (percpu_ref_init(&ctx->refs, io_ring_ctx_ref_free,
-			    PERCPU_REF_ALLOW_REINIT, GFP_KERNEL))
-		goto err;
-
-	ctx->flags = p->flags;
-	init_waitqueue_head(&ctx->sqo_sq_wait);
-	INIT_LIST_HEAD(&ctx->sqd_list);
-	init_waitqueue_head(&ctx->cq_wait);
-	INIT_LIST_HEAD(&ctx->cq_overflow_list);
-	init_completion(&ctx->ref_comp);
-	init_completion(&ctx->sq_thread_comp);
-	xa_init_flags(&ctx->io_buffers, XA_FLAGS_ALLOC1);
-	xa_init_flags(&ctx->personalities, XA_FLAGS_ALLOC1);
-	mutex_init(&ctx->uring_lock);
-	init_waitqueue_head(&ctx->wait);
-	spin_lock_init(&ctx->completion_lock);
-	INIT_LIST_HEAD(&ctx->iopoll_list);
-	INIT_LIST_HEAD(&ctx->defer_list);
-	INIT_LIST_HEAD(&ctx->timeout_list);
-	spin_lock_init(&ctx->inflight_lock);
-	INIT_LIST_HEAD(&ctx->inflight_list);
-	INIT_DELAYED_WORK(&ctx->file_put_work, io_file_put_work);
-	init_llist_head(&ctx->file_put_llist);
-	return ctx;
-err:
-	if (ctx->fallback_req)
-		kmem_cache_free(req_cachep, ctx->fallback_req);
-	kfree(ctx->cancel_hash);
-	kfree(ctx);
-	return NULL;
-}
-
-static bool req_need_defer(struct io_kiocb *req, u32 seq)
-{
-	if (unlikely(req->flags & REQ_F_IO_DRAIN)) {
-		struct io_ring_ctx *ctx = req->ctx;
-
-		return seq != ctx->cached_cq_tail
-				+ READ_ONCE(ctx->cached_cq_overflow);
-	}
-
-	return false;
-}
-
-static void __io_commit_cqring(struct io_ring_ctx *ctx)
-{
-	struct io_rings *rings = ctx->rings;
-
-	/* order cqe stores with ring update */
-	smp_store_release(&rings->cq.tail, ctx->cached_cq_tail);
-}
-
-static void io_put_identity(struct io_uring_task *tctx, struct io_kiocb *req)
-{
-	if (req->work.identity == &tctx->__identity)
-		return;
-	if (refcount_dec_and_test(&req->work.identity->count))
-		kfree(req->work.identity);
-}
-
-static void io_req_clean_work(struct io_kiocb *req)
-{
-	if (!(req->flags & REQ_F_WORK_INITIALIZED))
-		return;
-
-	req->flags &= ~REQ_F_WORK_INITIALIZED;
-
-	if (req->work.flags & IO_WQ_WORK_MM) {
-		mmdrop(req->work.identity->mm);
-		req->work.flags &= ~IO_WQ_WORK_MM;
-	}
-#ifdef CONFIG_BLK_CGROUP
-	if (req->work.flags & IO_WQ_WORK_BLKCG) {
-		css_put(req->work.identity->blkcg_css);
-		req->work.flags &= ~IO_WQ_WORK_BLKCG;
-	}
-#endif
-	if (req->work.flags & IO_WQ_WORK_CREDS) {
-		put_cred(req->work.identity->creds);
-		req->work.flags &= ~IO_WQ_WORK_CREDS;
-	}
-	if (req->work.flags & IO_WQ_WORK_FS) {
-		struct fs_struct *fs = req->work.identity->fs;
-
-		spin_lock(&req->work.identity->fs->lock);
-		if (--fs->users)
-			fs = NULL;
-		spin_unlock(&req->work.identity->fs->lock);
-		if (fs)
-			free_fs_struct(fs);
-		req->work.flags &= ~IO_WQ_WORK_FS;
-	}
-	if (req->flags & REQ_F_INFLIGHT)
-		io_req_drop_files(req);
-
-	io_put_identity(req->task->io_uring, req);
-}
-
-/*
- * Create a private copy of io_identity, since some fields don't match
- * the current context.
- */
-static bool io_identity_cow(struct io_kiocb *req)
-{
-	struct io_uring_task *tctx = req->task->io_uring;
-	const struct cred *creds = NULL;
-	struct io_identity *id;
-
-	if (req->work.flags & IO_WQ_WORK_CREDS)
-		creds = req->work.identity->creds;
-
-	id = kmemdup(req->work.identity, sizeof(*id), GFP_KERNEL);
-	if (unlikely(!id)) {
-		req->work.flags |= IO_WQ_WORK_CANCEL;
-		return false;
-	}
-
-	/*
-	 * We can safely just re-init the creds we copied  Either the field
-	 * matches the current one, or we haven't grabbed it yet. The only
-	 * exception is ->creds, through registered personalities, so handle
-	 * that one separately.
-	 */
-	io_init_identity(id);
-	if (creds)
-		id->creds = creds;
-
-	/* add one for this request */
-	refcount_inc(&id->count);
-
-	/* drop tctx and req identity references, if needed */
-	if (tctx->identity != &tctx->__identity &&
-	    refcount_dec_and_test(&tctx->identity->count))
-		kfree(tctx->identity);
-	if (req->work.identity != &tctx->__identity &&
-	    refcount_dec_and_test(&req->work.identity->count))
-		kfree(req->work.identity);
-
-	req->work.identity = id;
-	tctx->identity = id;
-	return true;
-}
-
-static bool io_grab_identity(struct io_kiocb *req)
-{
-	const struct io_op_def *def = &io_op_defs[req->opcode];
-	struct io_identity *id = req->work.identity;
-	struct io_ring_ctx *ctx = req->ctx;
-
-	if (def->work_flags & IO_WQ_WORK_FSIZE) {
-		if (id->fsize != rlimit(RLIMIT_FSIZE))
-			return false;
-		req->work.flags |= IO_WQ_WORK_FSIZE;
-	}
-#ifdef CONFIG_BLK_CGROUP
-	if (!(req->work.flags & IO_WQ_WORK_BLKCG) &&
-	    (def->work_flags & IO_WQ_WORK_BLKCG)) {
-		rcu_read_lock();
-		if (id->blkcg_css != blkcg_css()) {
-			rcu_read_unlock();
-			return false;
-		}
-		/*
-		 * This should be rare, either the cgroup is dying or the task
-		 * is moving cgroups. Just punt to root for the handful of ios.
-		 */
-		if (css_tryget_online(id->blkcg_css))
-			req->work.flags |= IO_WQ_WORK_BLKCG;
-		rcu_read_unlock();
-	}
-#endif
-	if (!(req->work.flags & IO_WQ_WORK_CREDS)) {
-		if (id->creds != current_cred())
-			return false;
-		get_cred(id->creds);
-		req->work.flags |= IO_WQ_WORK_CREDS;
-	}
-#ifdef CONFIG_AUDIT
-	if (!uid_eq(current->loginuid, id->loginuid) ||
-	    current->sessionid != id->sessionid)
-		return false;
-#endif
-	if (!(req->work.flags & IO_WQ_WORK_FS) &&
-	    (def->work_flags & IO_WQ_WORK_FS)) {
-		if (current->fs != id->fs)
-			return false;
-		spin_lock(&id->fs->lock);
-		if (!id->fs->in_exec) {
-			id->fs->users++;
-			req->work.flags |= IO_WQ_WORK_FS;
-		} else {
-			req->work.flags |= IO_WQ_WORK_CANCEL;
-		}
-		spin_unlock(&current->fs->lock);
-	}
-	if (!(req->work.flags & IO_WQ_WORK_FILES) &&
-	    (def->work_flags & IO_WQ_WORK_FILES) &&
-	    !(req->flags & REQ_F_NO_FILE_TABLE)) {
-		if (id->files != current->files ||
-		    id->nsproxy != current->nsproxy)
-			return false;
-		atomic_inc(&id->files->count);
-		get_nsproxy(id->nsproxy);
-
-		if (!(req->flags & REQ_F_INFLIGHT)) {
-			req->flags |= REQ_F_INFLIGHT;
-
-			spin_lock_irq(&ctx->inflight_lock);
-			list_add(&req->inflight_entry, &ctx->inflight_list);
-			spin_unlock_irq(&ctx->inflight_lock);
-		}
-		req->work.flags |= IO_WQ_WORK_FILES;
-	}
-	if (!(req->work.flags & IO_WQ_WORK_MM) &&
-	    (def->work_flags & IO_WQ_WORK_MM)) {
-		if (id->mm != current->mm)
-			return false;
-		mmgrab(id->mm);
-		req->work.flags |= IO_WQ_WORK_MM;
-	}
-
-	return true;
-}
-
-static void io_prep_async_work(struct io_kiocb *req)
-{
-	const struct io_op_def *def = &io_op_defs[req->opcode];
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_identity *id;
-
-	io_req_init_async(req);
-	id = req->work.identity;
-
-	if (req->flags & REQ_F_FORCE_ASYNC)
-		req->work.flags |= IO_WQ_WORK_CONCURRENT;
-
-	if (req->flags & REQ_F_ISREG) {
-		if (def->hash_reg_file || (ctx->flags & IORING_SETUP_IOPOLL))
-			io_wq_hash_work(&req->work, file_inode(req->file));
-	} else if (!req->file || !S_ISBLK(file_inode(req->file)->i_mode)) {
-		if (def->unbound_nonreg_file)
-			req->work.flags |= IO_WQ_WORK_UNBOUND;
-	}
-
-	/* if we fail grabbing identity, we must COW, regrab, and retry */
-	if (io_grab_identity(req))
-		return;
-
-	if (!io_identity_cow(req))
-		return;
-
-	/* can't fail at this point */
-	if (!io_grab_identity(req))
-		WARN_ON(1);
-}
-
-static void io_prep_async_link(struct io_kiocb *req)
-{
-	struct io_kiocb *cur;
-
-	io_prep_async_work(req);
-	if (req->flags & REQ_F_LINK_HEAD)
-		list_for_each_entry(cur, &req->link_list, link_list)
-			io_prep_async_work(cur);
-}
-
-static struct io_kiocb *__io_queue_async_work(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_kiocb *link = io_prep_linked_timeout(req);
-
-	trace_io_uring_queue_async_work(ctx, io_wq_is_hashed(&req->work), req,
-					&req->work, req->flags);
-	io_wq_enqueue(ctx->io_wq, &req->work);
-	return link;
-}
-
-static void io_queue_async_work(struct io_kiocb *req)
-{
-	struct io_kiocb *link;
-
-	/* init ->work of the whole link before punting */
-	io_prep_async_link(req);
-	link = __io_queue_async_work(req);
-
-	if (link)
-		io_queue_linked_timeout(link);
-}
-
-static void io_kill_timeout(struct io_kiocb *req, int status)
-{
-	struct io_timeout_data *io = req->async_data;
-	int ret;
-
-	ret = hrtimer_try_to_cancel(&io->timer);
-	if (ret != -1) {
-		if (status)
-			req_set_fail_links(req);
-		atomic_set(&req->ctx->cq_timeouts,
-			atomic_read(&req->ctx->cq_timeouts) + 1);
-		list_del_init(&req->timeout.list);
-		io_cqring_fill_event(req, status);
-		io_put_req_deferred(req, 1);
-	}
-}
-
-/*
- * Returns true if we found and killed one or more timeouts
- */
-static bool io_kill_timeouts(struct io_ring_ctx *ctx, struct task_struct *tsk,
-			     struct files_struct *files)
-{
-	struct io_kiocb *req, *tmp;
-	int canceled = 0;
-
-	spin_lock_irq(&ctx->completion_lock);
-	list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) {
-		if (io_match_task(req, tsk, files)) {
-			io_kill_timeout(req, -ECANCELED);
-			canceled++;
-		}
-	}
-	spin_unlock_irq(&ctx->completion_lock);
-	return canceled != 0;
-}
-
-static void __io_queue_deferred(struct io_ring_ctx *ctx)
-{
-	do {
-		struct io_defer_entry *de = list_first_entry(&ctx->defer_list,
-						struct io_defer_entry, list);
-
-		if (req_need_defer(de->req, de->seq))
-			break;
-		list_del_init(&de->list);
-		io_req_task_queue(de->req);
-		kfree(de);
-	} while (!list_empty(&ctx->defer_list));
-}
-
-static void io_flush_timeouts(struct io_ring_ctx *ctx)
-{
-	struct io_kiocb *req, *tmp;
-	u32 seq;
-
-	if (list_empty(&ctx->timeout_list))
-		return;
-
-	seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
-
-	list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) {
-		u32 events_needed, events_got;
-
-		if (io_is_timeout_noseq(req))
-			break;
-
-		/*
-		 * Since seq can easily wrap around over time, subtract
-		 * the last seq at which timeouts were flushed before comparing.
-		 * Assuming not more than 2^31-1 events have happened since,
-		 * these subtractions won't have wrapped, so we can check if
-		 * target is in [last_seq, current_seq] by comparing the two.
-		 */
-		events_needed = req->timeout.target_seq - ctx->cq_last_tm_flush;
-		events_got = seq - ctx->cq_last_tm_flush;
-		if (events_got < events_needed)
-			break;
-
-		io_kill_timeout(req, 0);
-	}
-
-	ctx->cq_last_tm_flush = seq;
-}
-
-static void io_commit_cqring(struct io_ring_ctx *ctx)
-{
-	io_flush_timeouts(ctx);
-	__io_commit_cqring(ctx);
-
-	if (unlikely(!list_empty(&ctx->defer_list)))
-		__io_queue_deferred(ctx);
-}
-
-static inline bool io_sqring_full(struct io_ring_ctx *ctx)
-{
-	struct io_rings *r = ctx->rings;
-
-	return READ_ONCE(r->sq.tail) - ctx->cached_sq_head == r->sq_ring_entries;
-}
-
-static struct io_uring_cqe *io_get_cqring(struct io_ring_ctx *ctx)
-{
-	struct io_rings *rings = ctx->rings;
-	unsigned tail;
-
-	tail = ctx->cached_cq_tail;
-	/*
-	 * writes to the cq entry need to come after reading head; the
-	 * control dependency is enough as we're using WRITE_ONCE to
-	 * fill the cq entry
-	 */
-	if (tail - READ_ONCE(rings->cq.head) == rings->cq_ring_entries)
-		return NULL;
-
-	ctx->cached_cq_tail++;
-	return &rings->cqes[tail & ctx->cq_mask];
-}
-
-static inline bool io_should_trigger_evfd(struct io_ring_ctx *ctx)
-{
-	if (!ctx->cq_ev_fd)
-		return false;
-	if (READ_ONCE(ctx->rings->cq_flags) & IORING_CQ_EVENTFD_DISABLED)
-		return false;
-	if (!ctx->eventfd_async)
-		return true;
-	return io_wq_current_is_worker();
-}
-
-static void io_cqring_ev_posted(struct io_ring_ctx *ctx)
-{
-	if (wq_has_sleeper(&ctx->cq_wait)) {
-		wake_up_interruptible(&ctx->cq_wait);
-		kill_fasync(&ctx->cq_fasync, SIGIO, POLL_IN);
-	}
-	if (waitqueue_active(&ctx->wait))
-		wake_up(&ctx->wait);
-	if (ctx->sq_data && waitqueue_active(&ctx->sq_data->wait))
-		wake_up(&ctx->sq_data->wait);
-	if (io_should_trigger_evfd(ctx))
-		eventfd_signal(ctx->cq_ev_fd, 1);
-}
-
-static void io_cqring_mark_overflow(struct io_ring_ctx *ctx)
-{
-	if (list_empty(&ctx->cq_overflow_list)) {
-		clear_bit(0, &ctx->sq_check_overflow);
-		clear_bit(0, &ctx->cq_check_overflow);
-		ctx->rings->sq_flags &= ~IORING_SQ_CQ_OVERFLOW;
-	}
-}
-
-/* Returns true if there are no backlogged entries after the flush */
-static bool __io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force,
-				       struct task_struct *tsk,
-				       struct files_struct *files)
-{
-	struct io_rings *rings = ctx->rings;
-	struct io_kiocb *req, *tmp;
-	struct io_uring_cqe *cqe;
-	unsigned long flags;
-	LIST_HEAD(list);
-
-	if (!force) {
-		if ((ctx->cached_cq_tail - READ_ONCE(rings->cq.head) ==
-		    rings->cq_ring_entries))
-			return false;
-	}
-
-	spin_lock_irqsave(&ctx->completion_lock, flags);
-
-	cqe = NULL;
-	list_for_each_entry_safe(req, tmp, &ctx->cq_overflow_list, compl.list) {
-		if (!io_match_task(req, tsk, files))
-			continue;
-
-		cqe = io_get_cqring(ctx);
-		if (!cqe && !force)
-			break;
-
-		list_move(&req->compl.list, &list);
-		if (cqe) {
-			WRITE_ONCE(cqe->user_data, req->user_data);
-			WRITE_ONCE(cqe->res, req->result);
-			WRITE_ONCE(cqe->flags, req->compl.cflags);
-		} else {
-			ctx->cached_cq_overflow++;
-			WRITE_ONCE(ctx->rings->cq_overflow,
-				   ctx->cached_cq_overflow);
-		}
-	}
-
-	io_commit_cqring(ctx);
-	io_cqring_mark_overflow(ctx);
-
-	spin_unlock_irqrestore(&ctx->completion_lock, flags);
-	io_cqring_ev_posted(ctx);
-
-	while (!list_empty(&list)) {
-		req = list_first_entry(&list, struct io_kiocb, compl.list);
-		list_del(&req->compl.list);
-		io_put_req(req);
-	}
-
-	return cqe != NULL;
-}
-
-static void io_cqring_overflow_flush(struct io_ring_ctx *ctx, bool force,
-				     struct task_struct *tsk,
-				     struct files_struct *files)
-{
-	if (test_bit(0, &ctx->cq_check_overflow)) {
-		/* iopoll syncs against uring_lock, not completion_lock */
-		if (ctx->flags & IORING_SETUP_IOPOLL)
-			mutex_lock(&ctx->uring_lock);
-		__io_cqring_overflow_flush(ctx, force, tsk, files);
-		if (ctx->flags & IORING_SETUP_IOPOLL)
-			mutex_unlock(&ctx->uring_lock);
-	}
-}
-
-static void __io_cqring_fill_event(struct io_kiocb *req, long res,
-				   unsigned int cflags)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_uring_cqe *cqe;
-
-	trace_io_uring_complete(ctx, req->user_data, res);
-
-	/*
-	 * If we can't get a cq entry, userspace overflowed the
-	 * submission (by quite a lot). Increment the overflow count in
-	 * the ring.
-	 */
-	cqe = io_get_cqring(ctx);
-	if (likely(cqe)) {
-		WRITE_ONCE(cqe->user_data, req->user_data);
-		WRITE_ONCE(cqe->res, res);
-		WRITE_ONCE(cqe->flags, cflags);
-	} else if (ctx->cq_overflow_flushed ||
-		   atomic_read(&req->task->io_uring->in_idle)) {
-		/*
-		 * If we're in ring overflow flush mode, or in task cancel mode,
-		 * then we cannot store the request for later flushing, we need
-		 * to drop it on the floor.
-		 */
-		ctx->cached_cq_overflow++;
-		WRITE_ONCE(ctx->rings->cq_overflow, ctx->cached_cq_overflow);
-	} else {
-		if (list_empty(&ctx->cq_overflow_list)) {
-			set_bit(0, &ctx->sq_check_overflow);
-			set_bit(0, &ctx->cq_check_overflow);
-			ctx->rings->sq_flags |= IORING_SQ_CQ_OVERFLOW;
-		}
-		io_clean_op(req);
-		req->result = res;
-		req->compl.cflags = cflags;
-		refcount_inc(&req->refs);
-		list_add_tail(&req->compl.list, &ctx->cq_overflow_list);
-	}
-}
-
-static void io_cqring_fill_event(struct io_kiocb *req, long res)
-{
-	__io_cqring_fill_event(req, res, 0);
-}
-
-static void io_cqring_add_event(struct io_kiocb *req, long res, long cflags)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ctx->completion_lock, flags);
-	__io_cqring_fill_event(req, res, cflags);
-	io_commit_cqring(ctx);
-	spin_unlock_irqrestore(&ctx->completion_lock, flags);
-
-	io_cqring_ev_posted(ctx);
-}
-
-static void io_submit_flush_completions(struct io_comp_state *cs)
-{
-	struct io_ring_ctx *ctx = cs->ctx;
-
-	spin_lock_irq(&ctx->completion_lock);
-	while (!list_empty(&cs->list)) {
-		struct io_kiocb *req;
-
-		req = list_first_entry(&cs->list, struct io_kiocb, compl.list);
-		list_del(&req->compl.list);
-		__io_cqring_fill_event(req, req->result, req->compl.cflags);
-
-		/*
-		 * io_free_req() doesn't care about completion_lock unless one
-		 * of these flags is set. REQ_F_WORK_INITIALIZED is in the list
-		 * because of a potential deadlock with req->work.fs->lock
-		 */
-		if (req->flags & (REQ_F_FAIL_LINK|REQ_F_LINK_TIMEOUT
-				 |REQ_F_WORK_INITIALIZED)) {
-			spin_unlock_irq(&ctx->completion_lock);
-			io_put_req(req);
-			spin_lock_irq(&ctx->completion_lock);
-		} else {
-			io_put_req(req);
-		}
-	}
-	io_commit_cqring(ctx);
-	spin_unlock_irq(&ctx->completion_lock);
-
-	io_cqring_ev_posted(ctx);
-	cs->nr = 0;
-}
-
-static void __io_req_complete(struct io_kiocb *req, long res, unsigned cflags,
-			      struct io_comp_state *cs)
-{
-	if (!cs) {
-		io_cqring_add_event(req, res, cflags);
-		io_put_req(req);
-	} else {
-		io_clean_op(req);
-		req->result = res;
-		req->compl.cflags = cflags;
-		list_add_tail(&req->compl.list, &cs->list);
-		if (++cs->nr >= 32)
-			io_submit_flush_completions(cs);
-	}
-}
-
-static void io_req_complete(struct io_kiocb *req, long res)
-{
-	__io_req_complete(req, res, 0, NULL);
-}
-
-static inline bool io_is_fallback_req(struct io_kiocb *req)
-{
-	return req == (struct io_kiocb *)
-			((unsigned long) req->ctx->fallback_req & ~1UL);
-}
-
-static struct io_kiocb *io_get_fallback_req(struct io_ring_ctx *ctx)
-{
-	struct io_kiocb *req;
-
-	req = ctx->fallback_req;
-	if (!test_and_set_bit_lock(0, (unsigned long *) &ctx->fallback_req))
-		return req;
-
-	return NULL;
-}
-
-static struct io_kiocb *io_alloc_req(struct io_ring_ctx *ctx,
-				     struct io_submit_state *state)
-{
-	if (!state->free_reqs) {
-		gfp_t gfp = GFP_KERNEL | __GFP_NOWARN;
-		size_t sz;
-		int ret;
-
-		sz = min_t(size_t, state->ios_left, ARRAY_SIZE(state->reqs));
-		ret = kmem_cache_alloc_bulk(req_cachep, gfp, sz, state->reqs);
-
-		/*
-		 * Bulk alloc is all-or-nothing. If we fail to get a batch,
-		 * retry single alloc to be on the safe side.
-		 */
-		if (unlikely(ret <= 0)) {
-			state->reqs[0] = kmem_cache_alloc(req_cachep, gfp);
-			if (!state->reqs[0])
-				goto fallback;
-			ret = 1;
-		}
-		state->free_reqs = ret;
-	}
-
-	state->free_reqs--;
-	return state->reqs[state->free_reqs];
-fallback:
-	return io_get_fallback_req(ctx);
-}
-
-static inline void io_put_file(struct io_kiocb *req, struct file *file,
-			  bool fixed)
-{
-	if (fixed)
-		percpu_ref_put(req->fixed_file_refs);
-	else
-		fput(file);
-}
-
-static void io_dismantle_req(struct io_kiocb *req)
-{
-	io_clean_op(req);
-
-	if (req->async_data)
-		kfree(req->async_data);
-	if (req->file)
-		io_put_file(req, req->file, (req->flags & REQ_F_FIXED_FILE));
-
-	io_req_clean_work(req);
-}
-
-static void __io_free_req(struct io_kiocb *req)
-{
-	struct io_uring_task *tctx = req->task->io_uring;
-	struct io_ring_ctx *ctx = req->ctx;
-
-	io_dismantle_req(req);
-
-	percpu_counter_dec(&tctx->inflight);
-	if (atomic_read(&tctx->in_idle))
-		wake_up(&tctx->wait);
-	put_task_struct(req->task);
-
-	if (likely(!io_is_fallback_req(req)))
-		kmem_cache_free(req_cachep, req);
-	else
-		clear_bit_unlock(0, (unsigned long *) &ctx->fallback_req);
-	percpu_ref_put(&ctx->refs);
-}
-
-static void io_kill_linked_timeout(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_kiocb *link;
-	bool cancelled = false;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ctx->completion_lock, flags);
-	link = list_first_entry_or_null(&req->link_list, struct io_kiocb,
-					link_list);
-	/*
-	 * Can happen if a linked timeout fired and link had been like
-	 * req -> link t-out -> link t-out [-> ...]
-	 */
-	if (link && (link->flags & REQ_F_LTIMEOUT_ACTIVE)) {
-		struct io_timeout_data *io = link->async_data;
-		int ret;
-
-		list_del_init(&link->link_list);
-		ret = hrtimer_try_to_cancel(&io->timer);
-		if (ret != -1) {
-			io_cqring_fill_event(link, -ECANCELED);
-			io_commit_cqring(ctx);
-			cancelled = true;
-		}
-	}
-	req->flags &= ~REQ_F_LINK_TIMEOUT;
-	spin_unlock_irqrestore(&ctx->completion_lock, flags);
-
-	if (cancelled) {
-		io_cqring_ev_posted(ctx);
-		io_put_req(link);
-	}
-}
-
-static struct io_kiocb *io_req_link_next(struct io_kiocb *req)
-{
-	struct io_kiocb *nxt;
-
-	/*
-	 * The list should never be empty when we are called here. But could
-	 * potentially happen if the chain is messed up, check to be on the
-	 * safe side.
-	 */
-	if (unlikely(list_empty(&req->link_list)))
-		return NULL;
-
-	nxt = list_first_entry(&req->link_list, struct io_kiocb, link_list);
-	list_del_init(&req->link_list);
-	if (!list_empty(&nxt->link_list))
-		nxt->flags |= REQ_F_LINK_HEAD;
-	return nxt;
-}
-
-/*
- * Called if REQ_F_LINK_HEAD is set, and we fail the head request
- */
-static void io_fail_links(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ctx->completion_lock, flags);
-	while (!list_empty(&req->link_list)) {
-		struct io_kiocb *link = list_first_entry(&req->link_list,
-						struct io_kiocb, link_list);
-
-		list_del_init(&link->link_list);
-		trace_io_uring_fail_link(req, link);
-
-		io_cqring_fill_event(link, -ECANCELED);
-
-		/*
-		 * It's ok to free under spinlock as they're not linked anymore,
-		 * but avoid REQ_F_WORK_INITIALIZED because it may deadlock on
-		 * work.fs->lock.
-		 */
-		if (link->flags & REQ_F_WORK_INITIALIZED)
-			io_put_req_deferred(link, 2);
-		else
-			io_double_put_req(link);
-	}
-
-	io_commit_cqring(ctx);
-	spin_unlock_irqrestore(&ctx->completion_lock, flags);
-
-	io_cqring_ev_posted(ctx);
-}
-
-static struct io_kiocb *__io_req_find_next(struct io_kiocb *req)
-{
-	req->flags &= ~REQ_F_LINK_HEAD;
-	if (req->flags & REQ_F_LINK_TIMEOUT)
-		io_kill_linked_timeout(req);
-
-	/*
-	 * If LINK is set, we have dependent requests in this chain. If we
-	 * didn't fail this request, queue the first one up, moving any other
-	 * dependencies to the next request. In case of failure, fail the rest
-	 * of the chain.
-	 */
-	if (likely(!(req->flags & REQ_F_FAIL_LINK)))
-		return io_req_link_next(req);
-	io_fail_links(req);
-	return NULL;
-}
-
-static struct io_kiocb *io_req_find_next(struct io_kiocb *req)
-{
-	if (likely(!(req->flags & REQ_F_LINK_HEAD)))
-		return NULL;
-	return __io_req_find_next(req);
-}
-
-static int io_req_task_work_add(struct io_kiocb *req, bool twa_signal_ok)
-{
-	struct task_struct *tsk = req->task;
-	struct io_ring_ctx *ctx = req->ctx;
-	enum task_work_notify_mode notify;
-	int ret;
-
-	if (tsk->flags & PF_EXITING)
-		return -ESRCH;
-
-	/*
-	 * SQPOLL kernel thread doesn't need notification, just a wakeup. For
-	 * all other cases, use TWA_SIGNAL unconditionally to ensure we're
-	 * processing task_work. There's no reliable way to tell if TWA_RESUME
-	 * will do the job.
-	 */
-	notify = TWA_NONE;
-	if (!(ctx->flags & IORING_SETUP_SQPOLL) && twa_signal_ok)
-		notify = TWA_SIGNAL;
-
-	ret = task_work_add(tsk, &req->task_work, notify);
-	if (!ret)
-		wake_up_process(tsk);
-
-	return ret;
-}
-
-static void __io_req_task_cancel(struct io_kiocb *req, int error)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-
-	spin_lock_irq(&ctx->completion_lock);
-	io_cqring_fill_event(req, error);
-	io_commit_cqring(ctx);
-	spin_unlock_irq(&ctx->completion_lock);
-
-	io_cqring_ev_posted(ctx);
-	req_set_fail_links(req);
-	io_double_put_req(req);
-}
-
-static void io_req_task_cancel(struct callback_head *cb)
-{
-	struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
-	struct io_ring_ctx *ctx = req->ctx;
-
-	mutex_lock(&ctx->uring_lock);
-	__io_req_task_cancel(req, -ECANCELED);
-	mutex_unlock(&ctx->uring_lock);
-	percpu_ref_put(&ctx->refs);
-}
-
-static void __io_req_task_submit(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-
-	mutex_lock(&ctx->uring_lock);
-	if (!ctx->sqo_dead && !__io_sq_thread_acquire_mm(ctx))
-		__io_queue_sqe(req, NULL);
-	else
-		__io_req_task_cancel(req, -EFAULT);
-	mutex_unlock(&ctx->uring_lock);
-
-	if (ctx->flags & IORING_SETUP_SQPOLL)
-		io_sq_thread_drop_mm();
-}
-
-static void io_req_task_submit(struct callback_head *cb)
-{
-	struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
-	struct io_ring_ctx *ctx = req->ctx;
-
-	__io_req_task_submit(req);
-	percpu_ref_put(&ctx->refs);
-}
-
-static void io_req_task_queue(struct io_kiocb *req)
-{
-	int ret;
-
-	init_task_work(&req->task_work, io_req_task_submit);
-	percpu_ref_get(&req->ctx->refs);
-
-	ret = io_req_task_work_add(req, true);
-	if (unlikely(ret)) {
-		struct task_struct *tsk;
-
-		init_task_work(&req->task_work, io_req_task_cancel);
-		tsk = io_wq_get_task(req->ctx->io_wq);
-		task_work_add(tsk, &req->task_work, TWA_NONE);
-		wake_up_process(tsk);
-	}
-}
-
-static void io_queue_next(struct io_kiocb *req)
-{
-	struct io_kiocb *nxt = io_req_find_next(req);
-
-	if (nxt)
-		io_req_task_queue(nxt);
-}
-
-static void io_free_req(struct io_kiocb *req)
-{
-	io_queue_next(req);
-	__io_free_req(req);
-}
-
-struct req_batch {
-	void *reqs[IO_IOPOLL_BATCH];
-	int to_free;
-
-	struct task_struct	*task;
-	int			task_refs;
-};
-
-static inline void io_init_req_batch(struct req_batch *rb)
-{
-	rb->to_free = 0;
-	rb->task_refs = 0;
-	rb->task = NULL;
-}
-
-static void __io_req_free_batch_flush(struct io_ring_ctx *ctx,
-				      struct req_batch *rb)
-{
-	kmem_cache_free_bulk(req_cachep, rb->to_free, rb->reqs);
-	percpu_ref_put_many(&ctx->refs, rb->to_free);
-	rb->to_free = 0;
-}
-
-static void io_req_free_batch_finish(struct io_ring_ctx *ctx,
-				     struct req_batch *rb)
-{
-	if (rb->to_free)
-		__io_req_free_batch_flush(ctx, rb);
-	if (rb->task) {
-		struct io_uring_task *tctx = rb->task->io_uring;
-
-		percpu_counter_sub(&tctx->inflight, rb->task_refs);
-		if (atomic_read(&tctx->in_idle))
-			wake_up(&tctx->wait);
-		put_task_struct_many(rb->task, rb->task_refs);
-		rb->task = NULL;
-	}
-}
-
-static void io_req_free_batch(struct req_batch *rb, struct io_kiocb *req)
-{
-	if (unlikely(io_is_fallback_req(req))) {
-		io_free_req(req);
-		return;
-	}
-	if (req->flags & REQ_F_LINK_HEAD)
-		io_queue_next(req);
-
-	if (req->task != rb->task) {
-		if (rb->task) {
-			struct io_uring_task *tctx = rb->task->io_uring;
-
-			percpu_counter_sub(&tctx->inflight, rb->task_refs);
-			if (atomic_read(&tctx->in_idle))
-				wake_up(&tctx->wait);
-			put_task_struct_many(rb->task, rb->task_refs);
-		}
-		rb->task = req->task;
-		rb->task_refs = 0;
-	}
-	rb->task_refs++;
-
-	io_dismantle_req(req);
-	rb->reqs[rb->to_free++] = req;
-	if (unlikely(rb->to_free == ARRAY_SIZE(rb->reqs)))
-		__io_req_free_batch_flush(req->ctx, rb);
-}
-
-/*
- * Drop reference to request, return next in chain (if there is one) if this
- * was the last reference to this request.
- */
-static struct io_kiocb *io_put_req_find_next(struct io_kiocb *req)
-{
-	struct io_kiocb *nxt = NULL;
-
-	if (refcount_dec_and_test(&req->refs)) {
-		nxt = io_req_find_next(req);
-		__io_free_req(req);
-	}
-	return nxt;
-}
-
-static void io_put_req(struct io_kiocb *req)
-{
-	if (refcount_dec_and_test(&req->refs))
-		io_free_req(req);
-}
-
-static void io_put_req_deferred_cb(struct callback_head *cb)
-{
-	struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
-
-	io_free_req(req);
-}
-
-static void io_free_req_deferred(struct io_kiocb *req)
-{
-	int ret;
-
-	init_task_work(&req->task_work, io_put_req_deferred_cb);
-	ret = io_req_task_work_add(req, true);
-	if (unlikely(ret)) {
-		struct task_struct *tsk;
-
-		tsk = io_wq_get_task(req->ctx->io_wq);
-		task_work_add(tsk, &req->task_work, TWA_NONE);
-		wake_up_process(tsk);
-	}
-}
-
-static inline void io_put_req_deferred(struct io_kiocb *req, int refs)
-{
-	if (refcount_sub_and_test(refs, &req->refs))
-		io_free_req_deferred(req);
-}
-
-static struct io_wq_work *io_steal_work(struct io_kiocb *req)
-{
-	struct io_kiocb *nxt;
-
-	/*
-	 * A ref is owned by io-wq in which context we're. So, if that's the
-	 * last one, it's safe to steal next work. False negatives are Ok,
-	 * it just will be re-punted async in io_put_work()
-	 */
-	if (refcount_read(&req->refs) != 1)
-		return NULL;
-
-	nxt = io_req_find_next(req);
-	return nxt ? &nxt->work : NULL;
-}
-
-static void io_double_put_req(struct io_kiocb *req)
-{
-	/* drop both submit and complete references */
-	if (refcount_sub_and_test(2, &req->refs))
-		io_free_req(req);
-}
-
-static unsigned io_cqring_events(struct io_ring_ctx *ctx)
-{
-	struct io_rings *rings = ctx->rings;
-
-	/* See comment at the top of this file */
-	smp_rmb();
-	return ctx->cached_cq_tail - READ_ONCE(rings->cq.head);
-}
-
-static inline unsigned int io_sqring_entries(struct io_ring_ctx *ctx)
-{
-	struct io_rings *rings = ctx->rings;
-
-	/* make sure SQ entry isn't read before tail */
-	return smp_load_acquire(&rings->sq.tail) - ctx->cached_sq_head;
-}
-
-static unsigned int io_put_kbuf(struct io_kiocb *req, struct io_buffer *kbuf)
-{
-	unsigned int cflags;
-
-	cflags = kbuf->bid << IORING_CQE_BUFFER_SHIFT;
-	cflags |= IORING_CQE_F_BUFFER;
-	req->flags &= ~REQ_F_BUFFER_SELECTED;
-	kfree(kbuf);
-	return cflags;
-}
-
-static inline unsigned int io_put_rw_kbuf(struct io_kiocb *req)
-{
-	struct io_buffer *kbuf;
-
-	kbuf = (struct io_buffer *) (unsigned long) req->rw.addr;
-	return io_put_kbuf(req, kbuf);
-}
-
-static inline bool io_run_task_work(void)
-{
-	/*
-	 * Not safe to run on exiting task, and the task_work handling will
-	 * not add work to such a task.
-	 */
-	if (unlikely(current->flags & PF_EXITING))
-		return false;
-	if (current->task_works) {
-		__set_current_state(TASK_RUNNING);
-		task_work_run();
-		return true;
-	}
-
-	return false;
-}
-
-static void io_iopoll_queue(struct list_head *again)
-{
-	struct io_kiocb *req;
-
-	do {
-		req = list_first_entry(again, struct io_kiocb, iopoll_entry);
-		list_del(&req->iopoll_entry);
-		__io_complete_rw(req, -EAGAIN, 0, NULL);
-	} while (!list_empty(again));
-}
-
-/*
- * Find and free completed poll iocbs
- */
-static void io_iopoll_complete(struct io_ring_ctx *ctx, unsigned int *nr_events,
-			       struct list_head *done)
-{
-	struct req_batch rb;
-	struct io_kiocb *req;
-	LIST_HEAD(again);
-
-	/* order with ->result store in io_complete_rw_iopoll() */
-	smp_rmb();
-
-	io_init_req_batch(&rb);
-	while (!list_empty(done)) {
-		int cflags = 0;
-
-		req = list_first_entry(done, struct io_kiocb, iopoll_entry);
-		if (READ_ONCE(req->result) == -EAGAIN) {
-			req->result = 0;
-			req->iopoll_completed = 0;
-			list_move_tail(&req->iopoll_entry, &again);
-			continue;
-		}
-		list_del(&req->iopoll_entry);
-
-		if (req->flags & REQ_F_BUFFER_SELECTED)
-			cflags = io_put_rw_kbuf(req);
-
-		__io_cqring_fill_event(req, req->result, cflags);
-		(*nr_events)++;
-
-		if (refcount_dec_and_test(&req->refs))
-			io_req_free_batch(&rb, req);
-	}
-
-	io_commit_cqring(ctx);
-	if (ctx->flags & IORING_SETUP_SQPOLL)
-		io_cqring_ev_posted(ctx);
-	io_req_free_batch_finish(ctx, &rb);
-
-	if (!list_empty(&again))
-		io_iopoll_queue(&again);
-}
-
-static int io_do_iopoll(struct io_ring_ctx *ctx, unsigned int *nr_events,
-			long min)
-{
-	struct io_kiocb *req, *tmp;
-	LIST_HEAD(done);
-	bool spin;
-	int ret;
-
-	/*
-	 * Only spin for completions if we don't have multiple devices hanging
-	 * off our complete list, and we're under the requested amount.
-	 */
-	spin = !ctx->poll_multi_file && *nr_events < min;
-
-	ret = 0;
-	list_for_each_entry_safe(req, tmp, &ctx->iopoll_list, iopoll_entry) {
-		struct kiocb *kiocb = &req->rw.kiocb;
-
-		/*
-		 * Move completed and retryable entries to our local lists.
-		 * If we find a request that requires polling, break out
-		 * and complete those lists first, if we have entries there.
-		 */
-		if (READ_ONCE(req->iopoll_completed)) {
-			list_move_tail(&req->iopoll_entry, &done);
-			continue;
-		}
-		if (!list_empty(&done))
-			break;
-
-		ret = kiocb->ki_filp->f_op->iopoll(kiocb, spin);
-		if (ret < 0)
-			break;
-
-		/* iopoll may have completed current req */
-		if (READ_ONCE(req->iopoll_completed))
-			list_move_tail(&req->iopoll_entry, &done);
-
-		if (ret && spin)
-			spin = false;
-		ret = 0;
-	}
-
-	if (!list_empty(&done))
-		io_iopoll_complete(ctx, nr_events, &done);
-
-	return ret;
-}
-
-/*
- * Poll for a minimum of 'min' events. Note that if min == 0 we consider that a
- * non-spinning poll check - we'll still enter the driver poll loop, but only
- * as a non-spinning completion check.
- */
-static int io_iopoll_getevents(struct io_ring_ctx *ctx, unsigned int *nr_events,
-				long min)
-{
-	while (!list_empty(&ctx->iopoll_list) && !need_resched()) {
-		int ret;
-
-		ret = io_do_iopoll(ctx, nr_events, min);
-		if (ret < 0)
-			return ret;
-		if (*nr_events >= min)
-			return 0;
-	}
-
-	return 1;
-}
-
-/*
- * We can't just wait for polled events to come to us, we have to actively
- * find and complete them.
- */
-static void io_iopoll_try_reap_events(struct io_ring_ctx *ctx)
-{
-	if (!(ctx->flags & IORING_SETUP_IOPOLL))
-		return;
-
-	mutex_lock(&ctx->uring_lock);
-	while (!list_empty(&ctx->iopoll_list)) {
-		unsigned int nr_events = 0;
-
-		io_do_iopoll(ctx, &nr_events, 0);
-
-		/* let it sleep and repeat later if can't complete a request */
-		if (nr_events == 0)
-			break;
-		/*
-		 * Ensure we allow local-to-the-cpu processing to take place,
-		 * in this case we need to ensure that we reap all events.
-		 * Also let task_work, etc. to progress by releasing the mutex
-		 */
-		if (need_resched()) {
-			mutex_unlock(&ctx->uring_lock);
-			cond_resched();
-			mutex_lock(&ctx->uring_lock);
-		}
-	}
-	mutex_unlock(&ctx->uring_lock);
-}
-
-static int io_iopoll_check(struct io_ring_ctx *ctx, long min)
-{
-	unsigned int nr_events = 0;
-	int iters = 0, ret = 0;
-
-	/*
-	 * We disallow the app entering submit/complete with polling, but we
-	 * still need to lock the ring to prevent racing with polled issue
-	 * that got punted to a workqueue.
-	 */
-	mutex_lock(&ctx->uring_lock);
-	do {
-		/*
-		 * Don't enter poll loop if we already have events pending.
-		 * If we do, we can potentially be spinning for commands that
-		 * already triggered a CQE (eg in error).
-		 */
-		if (test_bit(0, &ctx->cq_check_overflow))
-			__io_cqring_overflow_flush(ctx, false, NULL, NULL);
-		if (io_cqring_events(ctx))
-			break;
-
-		/*
-		 * If a submit got punted to a workqueue, we can have the
-		 * application entering polling for a command before it gets
-		 * issued. That app will hold the uring_lock for the duration
-		 * of the poll right here, so we need to take a breather every
-		 * now and then to ensure that the issue has a chance to add
-		 * the poll to the issued list. Otherwise we can spin here
-		 * forever, while the workqueue is stuck trying to acquire the
-		 * very same mutex.
-		 */
-		if (!(++iters & 7)) {
-			mutex_unlock(&ctx->uring_lock);
-			io_run_task_work();
-			mutex_lock(&ctx->uring_lock);
-		}
-
-		ret = io_iopoll_getevents(ctx, &nr_events, min);
-		if (ret <= 0)
-			break;
-		ret = 0;
-	} while (min && !nr_events && !need_resched());
-
-	mutex_unlock(&ctx->uring_lock);
-	return ret;
-}
-
-static void kiocb_end_write(struct io_kiocb *req)
-{
-	/*
-	 * Tell lockdep we inherited freeze protection from submission
-	 * thread.
-	 */
-	if (req->flags & REQ_F_ISREG) {
-		struct inode *inode = file_inode(req->file);
-
-		__sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
-	}
-	file_end_write(req->file);
-}
-
-static void io_complete_rw_common(struct kiocb *kiocb, long res,
-				  struct io_comp_state *cs)
-{
-	struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
-	int cflags = 0;
-
-	if (kiocb->ki_flags & IOCB_WRITE)
-		kiocb_end_write(req);
-
-	if (res != req->result)
-		req_set_fail_links(req);
-	if (req->flags & REQ_F_BUFFER_SELECTED)
-		cflags = io_put_rw_kbuf(req);
-	__io_req_complete(req, res, cflags, cs);
-}
-
-#ifdef CONFIG_BLOCK
-static bool io_resubmit_prep(struct io_kiocb *req, int error)
-{
-	req_set_fail_links(req);
-	return false;
-}
-#endif
-
-static bool io_rw_reissue(struct io_kiocb *req, long res)
-{
-#ifdef CONFIG_BLOCK
-	umode_t mode = file_inode(req->file)->i_mode;
-	int ret;
-
-	if (!S_ISBLK(mode) && !S_ISREG(mode))
-		return false;
-	if ((res != -EAGAIN && res != -EOPNOTSUPP) || io_wq_current_is_worker())
-		return false;
-	/*
-	 * If ref is dying, we might be running poll reap from the exit work.
-	 * Don't attempt to reissue from that path, just let it fail with
-	 * -EAGAIN.
-	 */
-	if (percpu_ref_is_dying(&req->ctx->refs))
-		return false;
-
-	ret = io_sq_thread_acquire_mm(req->ctx, req);
-
-	if (io_resubmit_prep(req, ret)) {
-		refcount_inc(&req->refs);
-		io_queue_async_work(req);
-		return true;
-	}
-
-#endif
-	return false;
-}
-
-static void __io_complete_rw(struct io_kiocb *req, long res, long res2,
-			     struct io_comp_state *cs)
-{
-	if (!io_rw_reissue(req, res))
-		io_complete_rw_common(&req->rw.kiocb, res, cs);
-}
-
-static void io_complete_rw(struct kiocb *kiocb, long res, long res2)
-{
-	struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
-
-	__io_complete_rw(req, res, res2, NULL);
-}
-
-static void io_complete_rw_iopoll(struct kiocb *kiocb, long res, long res2)
-{
-	struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
-
-	if (kiocb->ki_flags & IOCB_WRITE)
-		kiocb_end_write(req);
-
-	if (res != -EAGAIN && res != req->result)
-		req_set_fail_links(req);
-
-	WRITE_ONCE(req->result, res);
-	/* order with io_poll_complete() checking ->result */
-	smp_wmb();
-	WRITE_ONCE(req->iopoll_completed, 1);
-}
-
-/*
- * After the iocb has been issued, it's safe to be found on the poll list.
- * Adding the kiocb to the list AFTER submission ensures that we don't
- * find it from a io_iopoll_getevents() thread before the issuer is done
- * accessing the kiocb cookie.
- */
-static void io_iopoll_req_issued(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-
-	/*
-	 * Track whether we have multiple files in our lists. This will impact
-	 * how we do polling eventually, not spinning if we're on potentially
-	 * different devices.
-	 */
-	if (list_empty(&ctx->iopoll_list)) {
-		ctx->poll_multi_file = false;
-	} else if (!ctx->poll_multi_file) {
-		struct io_kiocb *list_req;
-
-		list_req = list_first_entry(&ctx->iopoll_list, struct io_kiocb,
-						iopoll_entry);
-		if (list_req->file != req->file)
-			ctx->poll_multi_file = true;
-	}
-
-	/*
-	 * For fast devices, IO may have already completed. If it has, add
-	 * it to the front so we find it first.
-	 */
-	if (READ_ONCE(req->iopoll_completed))
-		list_add(&req->iopoll_entry, &ctx->iopoll_list);
-	else
-		list_add_tail(&req->iopoll_entry, &ctx->iopoll_list);
-
-	if ((ctx->flags & IORING_SETUP_SQPOLL) &&
-	    wq_has_sleeper(&ctx->sq_data->wait))
-		wake_up(&ctx->sq_data->wait);
-}
-
-static void __io_state_file_put(struct io_submit_state *state)
-{
-	if (state->has_refs)
-		fput_many(state->file, state->has_refs);
-	state->file = NULL;
-}
-
-static inline void io_state_file_put(struct io_submit_state *state)
-{
-	if (state->file)
-		__io_state_file_put(state);
-}
-
-/*
- * Get as many references to a file as we have IOs left in this submission,
- * assuming most submissions are for one file, or at least that each file
- * has more than one submission.
- */
-static struct file *__io_file_get(struct io_submit_state *state, int fd)
-{
-	if (!state)
-		return fget(fd);
-
-	if (state->file) {
-		if (state->fd == fd) {
-			state->has_refs--;
-			return state->file;
-		}
-		__io_state_file_put(state);
-	}
-	state->file = fget_many(fd, state->ios_left);
-	if (!state->file)
-		return NULL;
-
-	state->fd = fd;
-	state->has_refs = state->ios_left - 1;
-	return state->file;
-}
-
-static bool io_bdev_nowait(struct block_device *bdev)
-{
-#ifdef CONFIG_BLOCK
-	return !bdev || blk_queue_nowait(bdev_get_queue(bdev));
-#else
-	return true;
-#endif
-}
-
-/*
- * If we tracked the file through the SCM inflight mechanism, we could support
- * any file. For now, just ensure that anything potentially problematic is done
- * inline.
- */
-static bool io_file_supports_async(struct file *file, int rw)
-{
-	umode_t mode = file_inode(file)->i_mode;
-
-	if (S_ISBLK(mode)) {
-		if (io_bdev_nowait(file->f_inode->i_bdev))
-			return true;
-		return false;
-	}
-	if (S_ISSOCK(mode))
-		return true;
-	if (S_ISREG(mode)) {
-		if (io_bdev_nowait(file->f_inode->i_sb->s_bdev) &&
-		    file->f_op != &io_uring_fops)
-			return true;
-		return false;
-	}
-
-	/* any ->read/write should understand O_NONBLOCK */
-	if (file->f_flags & O_NONBLOCK)
-		return true;
-
-	if (!(file->f_mode & FMODE_NOWAIT))
-		return false;
-
-	if (rw == READ)
-		return file->f_op->read_iter != NULL;
-
-	return file->f_op->write_iter != NULL;
-}
-
-static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	struct kiocb *kiocb = &req->rw.kiocb;
-	unsigned ioprio;
-	int ret;
-
-	if (S_ISREG(file_inode(req->file)->i_mode))
-		req->flags |= REQ_F_ISREG;
-
-	kiocb->ki_pos = READ_ONCE(sqe->off);
-	if (kiocb->ki_pos == -1 && !(req->file->f_mode & FMODE_STREAM)) {
-		req->flags |= REQ_F_CUR_POS;
-		kiocb->ki_pos = req->file->f_pos;
-	}
-	kiocb->ki_hint = ki_hint_validate(file_write_hint(kiocb->ki_filp));
-	kiocb->ki_flags = iocb_flags(kiocb->ki_filp);
-	ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags));
-	if (unlikely(ret))
-		return ret;
-
-	ioprio = READ_ONCE(sqe->ioprio);
-	if (ioprio) {
-		ret = ioprio_check_cap(ioprio);
-		if (ret)
-			return ret;
-
-		kiocb->ki_ioprio = ioprio;
-	} else
-		kiocb->ki_ioprio = get_current_ioprio();
-
-	/* don't allow async punt if RWF_NOWAIT was requested */
-	if (kiocb->ki_flags & IOCB_NOWAIT)
-		req->flags |= REQ_F_NOWAIT;
-
-	if (ctx->flags & IORING_SETUP_IOPOLL) {
-		if (!(kiocb->ki_flags & IOCB_DIRECT) ||
-		    !kiocb->ki_filp->f_op->iopoll)
-			return -EOPNOTSUPP;
-
-		kiocb->ki_flags |= IOCB_HIPRI;
-		kiocb->ki_complete = io_complete_rw_iopoll;
-		req->iopoll_completed = 0;
-	} else {
-		if (kiocb->ki_flags & IOCB_HIPRI)
-			return -EINVAL;
-		kiocb->ki_complete = io_complete_rw;
-	}
-
-	req->rw.addr = READ_ONCE(sqe->addr);
-	req->rw.len = READ_ONCE(sqe->len);
-	req->buf_index = READ_ONCE(sqe->buf_index);
-	return 0;
-}
-
-static inline void io_rw_done(struct kiocb *kiocb, ssize_t ret)
-{
-	switch (ret) {
-	case -EIOCBQUEUED:
-		break;
-	case -ERESTARTSYS:
-	case -ERESTARTNOINTR:
-	case -ERESTARTNOHAND:
-	case -ERESTART_RESTARTBLOCK:
-		/*
-		 * We can't just restart the syscall, since previously
-		 * submitted sqes may already be in progress. Just fail this
-		 * IO with EINTR.
-		 */
-		ret = -EINTR;
-		fallthrough;
-	default:
-		kiocb->ki_complete(kiocb, ret, 0);
-	}
-}
-
-static void kiocb_done(struct kiocb *kiocb, ssize_t ret,
-		       struct io_comp_state *cs)
-{
-	struct io_kiocb *req = container_of(kiocb, struct io_kiocb, rw.kiocb);
-	struct io_async_rw *io = req->async_data;
-
-	/* add previously done IO, if any */
-	if (io && io->bytes_done > 0) {
-		if (ret < 0)
-			ret = io->bytes_done;
-		else
-			ret += io->bytes_done;
-	}
-
-	if (req->flags & REQ_F_CUR_POS)
-		req->file->f_pos = kiocb->ki_pos;
-	if (ret >= 0 && kiocb->ki_complete == io_complete_rw)
-		__io_complete_rw(req, ret, 0, cs);
-	else
-		io_rw_done(kiocb, ret);
-}
-
-static ssize_t io_import_fixed(struct io_kiocb *req, int rw,
-			       struct iov_iter *iter)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	size_t len = req->rw.len;
-	struct io_mapped_ubuf *imu;
-	u16 index, buf_index = req->buf_index;
-	size_t offset;
-	u64 buf_addr;
-
-	if (unlikely(buf_index >= ctx->nr_user_bufs))
-		return -EFAULT;
-	index = array_index_nospec(buf_index, ctx->nr_user_bufs);
-	imu = &ctx->user_bufs[index];
-	buf_addr = req->rw.addr;
-
-	/* overflow */
-	if (buf_addr + len < buf_addr)
-		return -EFAULT;
-	/* not inside the mapped region */
-	if (buf_addr < imu->ubuf || buf_addr + len > imu->ubuf + imu->len)
-		return -EFAULT;
-
-	/*
-	 * May not be a start of buffer, set size appropriately
-	 * and advance us to the beginning.
-	 */
-	offset = buf_addr - imu->ubuf;
-	iov_iter_bvec(iter, rw, imu->bvec, imu->nr_bvecs, offset + len);
-
-	if (offset) {
-		/*
-		 * Don't use iov_iter_advance() here, as it's really slow for
-		 * using the latter parts of a big fixed buffer - it iterates
-		 * over each segment manually. We can cheat a bit here, because
-		 * we know that:
-		 *
-		 * 1) it's a BVEC iter, we set it up
-		 * 2) all bvecs are PAGE_SIZE in size, except potentially the
-		 *    first and last bvec
-		 *
-		 * So just find our index, and adjust the iterator afterwards.
-		 * If the offset is within the first bvec (or the whole first
-		 * bvec, just use iov_iter_advance(). This makes it easier
-		 * since we can just skip the first segment, which may not
-		 * be PAGE_SIZE aligned.
-		 */
-		const struct bio_vec *bvec = imu->bvec;
-
-		if (offset <= bvec->bv_len) {
-			iov_iter_advance(iter, offset);
-		} else {
-			unsigned long seg_skip;
-
-			/* skip first vec */
-			offset -= bvec->bv_len;
-			seg_skip = 1 + (offset >> PAGE_SHIFT);
-
-			iter->bvec = bvec + seg_skip;
-			iter->nr_segs -= seg_skip;
-			iter->count -= bvec->bv_len + offset;
-			iter->iov_offset = offset & ~PAGE_MASK;
-		}
-	}
-
-	return len;
-}
-
-static void io_ring_submit_unlock(struct io_ring_ctx *ctx, bool needs_lock)
-{
-	if (needs_lock)
-		mutex_unlock(&ctx->uring_lock);
-}
-
-static void io_ring_submit_lock(struct io_ring_ctx *ctx, bool needs_lock)
-{
-	/*
-	 * "Normal" inline submissions always hold the uring_lock, since we
-	 * grab it from the system call. Same is true for the SQPOLL offload.
-	 * The only exception is when we've detached the request and issue it
-	 * from an async worker thread, grab the lock for that case.
-	 */
-	if (needs_lock)
-		mutex_lock(&ctx->uring_lock);
-}
-
-static struct io_buffer *io_buffer_select(struct io_kiocb *req, size_t *len,
-					  int bgid, struct io_buffer *kbuf,
-					  bool needs_lock)
-{
-	struct io_buffer *head;
-
-	if (req->flags & REQ_F_BUFFER_SELECTED)
-		return kbuf;
-
-	io_ring_submit_lock(req->ctx, needs_lock);
-
-	lockdep_assert_held(&req->ctx->uring_lock);
-
-	head = xa_load(&req->ctx->io_buffers, bgid);
-	if (head) {
-		if (!list_empty(&head->list)) {
-			kbuf = list_last_entry(&head->list, struct io_buffer,
-							list);
-			list_del(&kbuf->list);
-		} else {
-			kbuf = head;
-			xa_erase(&req->ctx->io_buffers, bgid);
-		}
-		if (*len > kbuf->len)
-			*len = kbuf->len;
-	} else {
-		kbuf = ERR_PTR(-ENOBUFS);
-	}
-
-	io_ring_submit_unlock(req->ctx, needs_lock);
-
-	return kbuf;
-}
-
-static void __user *io_rw_buffer_select(struct io_kiocb *req, size_t *len,
-					bool needs_lock)
-{
-	struct io_buffer *kbuf;
-	u16 bgid;
-
-	kbuf = (struct io_buffer *) (unsigned long) req->rw.addr;
-	bgid = req->buf_index;
-	kbuf = io_buffer_select(req, len, bgid, kbuf, needs_lock);
-	if (IS_ERR(kbuf))
-		return kbuf;
-	req->rw.addr = (u64) (unsigned long) kbuf;
-	req->flags |= REQ_F_BUFFER_SELECTED;
-	return u64_to_user_ptr(kbuf->addr);
-}
-
-#ifdef CONFIG_COMPAT
-static ssize_t io_compat_import(struct io_kiocb *req, struct iovec *iov,
-				bool needs_lock)
-{
-	struct compat_iovec __user *uiov;
-	compat_ssize_t clen;
-	void __user *buf;
-	ssize_t len;
-
-	uiov = u64_to_user_ptr(req->rw.addr);
-	if (!access_ok(uiov, sizeof(*uiov)))
-		return -EFAULT;
-	if (__get_user(clen, &uiov->iov_len))
-		return -EFAULT;
-	if (clen < 0)
-		return -EINVAL;
-
-	len = clen;
-	buf = io_rw_buffer_select(req, &len, needs_lock);
-	if (IS_ERR(buf))
-		return PTR_ERR(buf);
-	iov[0].iov_base = buf;
-	iov[0].iov_len = (compat_size_t) len;
-	return 0;
-}
-#endif
-
-static ssize_t __io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov,
-				      bool needs_lock)
-{
-	struct iovec __user *uiov = u64_to_user_ptr(req->rw.addr);
-	void __user *buf;
-	ssize_t len;
-
-	if (copy_from_user(iov, uiov, sizeof(*uiov)))
-		return -EFAULT;
-
-	len = iov[0].iov_len;
-	if (len < 0)
-		return -EINVAL;
-	buf = io_rw_buffer_select(req, &len, needs_lock);
-	if (IS_ERR(buf))
-		return PTR_ERR(buf);
-	iov[0].iov_base = buf;
-	iov[0].iov_len = len;
-	return 0;
-}
-
-static ssize_t io_iov_buffer_select(struct io_kiocb *req, struct iovec *iov,
-				    bool needs_lock)
-{
-	if (req->flags & REQ_F_BUFFER_SELECTED) {
-		struct io_buffer *kbuf;
-
-		kbuf = (struct io_buffer *) (unsigned long) req->rw.addr;
-		iov[0].iov_base = u64_to_user_ptr(kbuf->addr);
-		iov[0].iov_len = kbuf->len;
-		return 0;
-	}
-	if (req->rw.len != 1)
-		return -EINVAL;
-
-#ifdef CONFIG_COMPAT
-	if (req->ctx->compat)
-		return io_compat_import(req, iov, needs_lock);
-#endif
-
-	return __io_iov_buffer_select(req, iov, needs_lock);
-}
-
-static ssize_t __io_import_iovec(int rw, struct io_kiocb *req,
-				 struct iovec **iovec, struct iov_iter *iter,
-				 bool needs_lock)
-{
-	void __user *buf = u64_to_user_ptr(req->rw.addr);
-	size_t sqe_len = req->rw.len;
-	ssize_t ret;
-	u8 opcode;
-
-	opcode = req->opcode;
-	if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) {
-		*iovec = NULL;
-		return io_import_fixed(req, rw, iter);
-	}
-
-	/* buffer index only valid with fixed read/write, or buffer select  */
-	if (req->buf_index && !(req->flags & REQ_F_BUFFER_SELECT))
-		return -EINVAL;
-
-	if (opcode == IORING_OP_READ || opcode == IORING_OP_WRITE) {
-		if (req->flags & REQ_F_BUFFER_SELECT) {
-			buf = io_rw_buffer_select(req, &sqe_len, needs_lock);
-			if (IS_ERR(buf))
-				return PTR_ERR(buf);
-			req->rw.len = sqe_len;
-		}
-
-		ret = import_single_range(rw, buf, sqe_len, *iovec, iter);
-		*iovec = NULL;
-		return ret;
-	}
-
-	if (req->flags & REQ_F_BUFFER_SELECT) {
-		ret = io_iov_buffer_select(req, *iovec, needs_lock);
-		if (!ret) {
-			ret = (*iovec)->iov_len;
-			iov_iter_init(iter, rw, *iovec, 1, ret);
-		}
-		*iovec = NULL;
-		return ret;
-	}
-
-	return __import_iovec(rw, buf, sqe_len, UIO_FASTIOV, iovec, iter,
-			      req->ctx->compat);
-}
-
-static ssize_t io_import_iovec(int rw, struct io_kiocb *req,
-			       struct iovec **iovec, struct iov_iter *iter,
-			       bool needs_lock)
-{
-	struct io_async_rw *iorw = req->async_data;
-
-	if (!iorw)
-		return __io_import_iovec(rw, req, iovec, iter, needs_lock);
-	*iovec = NULL;
-	return 0;
-}
-
-static inline loff_t *io_kiocb_ppos(struct kiocb *kiocb)
-{
-	return (kiocb->ki_filp->f_mode & FMODE_STREAM) ? NULL : &kiocb->ki_pos;
-}
-
-/*
- * For files that don't have ->read_iter() and ->write_iter(), handle them
- * by looping over ->read() or ->write() manually.
- */
-static ssize_t loop_rw_iter(int rw, struct io_kiocb *req, struct iov_iter *iter)
-{
-	struct kiocb *kiocb = &req->rw.kiocb;
-	struct file *file = req->file;
-	ssize_t ret = 0;
-
-	/*
-	 * Don't support polled IO through this interface, and we can't
-	 * support non-blocking either. For the latter, this just causes
-	 * the kiocb to be handled from an async context.
-	 */
-	if (kiocb->ki_flags & IOCB_HIPRI)
-		return -EOPNOTSUPP;
-	if (kiocb->ki_flags & IOCB_NOWAIT)
-		return -EAGAIN;
-
-	while (iov_iter_count(iter)) {
-		struct iovec iovec;
-		ssize_t nr;
-
-		if (!iov_iter_is_bvec(iter)) {
-			iovec = iov_iter_iovec(iter);
-		} else {
-			iovec.iov_base = u64_to_user_ptr(req->rw.addr);
-			iovec.iov_len = req->rw.len;
-		}
-
-		if (rw == READ) {
-			nr = file->f_op->read(file, iovec.iov_base,
-					      iovec.iov_len, io_kiocb_ppos(kiocb));
-		} else {
-			nr = file->f_op->write(file, iovec.iov_base,
-					       iovec.iov_len, io_kiocb_ppos(kiocb));
-		}
-
-		if (nr < 0) {
-			if (!ret)
-				ret = nr;
-			break;
-		}
-		ret += nr;
-		if (!iov_iter_is_bvec(iter)) {
-			iov_iter_advance(iter, nr);
-		} else {
-			req->rw.addr += nr;
-			req->rw.len -= nr;
-			if (!req->rw.len)
-				break;
-		}
-		if (nr != iovec.iov_len)
-			break;
-	}
-
-	return ret;
-}
-
-static void io_req_map_rw(struct io_kiocb *req, const struct iovec *iovec,
-			  const struct iovec *fast_iov, struct iov_iter *iter)
-{
-	struct io_async_rw *rw = req->async_data;
-
-	memcpy(&rw->iter, iter, sizeof(*iter));
-	rw->free_iovec = iovec;
-	rw->bytes_done = 0;
-	/* can only be fixed buffers, no need to do anything */
-	if (iov_iter_is_bvec(iter))
-		return;
-	if (!iovec) {
-		unsigned iov_off = 0;
-
-		rw->iter.iov = rw->fast_iov;
-		if (iter->iov != fast_iov) {
-			iov_off = iter->iov - fast_iov;
-			rw->iter.iov += iov_off;
-		}
-		if (rw->fast_iov != fast_iov)
-			memcpy(rw->fast_iov + iov_off, fast_iov + iov_off,
-			       sizeof(struct iovec) * iter->nr_segs);
-	} else {
-		req->flags |= REQ_F_NEED_CLEANUP;
-	}
-}
-
-static inline int __io_alloc_async_data(struct io_kiocb *req)
-{
-	WARN_ON_ONCE(!io_op_defs[req->opcode].async_size);
-	req->async_data = kmalloc(io_op_defs[req->opcode].async_size, GFP_KERNEL);
-	return req->async_data == NULL;
-}
-
-static int io_alloc_async_data(struct io_kiocb *req)
-{
-	if (!io_op_defs[req->opcode].needs_async_data)
-		return 0;
-
-	return  __io_alloc_async_data(req);
-}
-
-static int io_setup_async_rw(struct io_kiocb *req, const struct iovec *iovec,
-			     const struct iovec *fast_iov,
-			     struct iov_iter *iter, bool force)
-{
-	if (!force && !io_op_defs[req->opcode].needs_async_data)
-		return 0;
-	if (!req->async_data) {
-		if (__io_alloc_async_data(req))
-			return -ENOMEM;
-
-		io_req_map_rw(req, iovec, fast_iov, iter);
-	}
-	return 0;
-}
-
-static inline int io_rw_prep_async(struct io_kiocb *req, int rw)
-{
-	struct io_async_rw *iorw = req->async_data;
-	struct iovec *iov = iorw->fast_iov;
-	ssize_t ret;
-
-	ret = __io_import_iovec(rw, req, &iov, &iorw->iter, false);
-	if (unlikely(ret < 0))
-		return ret;
-
-	iorw->bytes_done = 0;
-	iorw->free_iovec = iov;
-	if (iov)
-		req->flags |= REQ_F_NEED_CLEANUP;
-	return 0;
-}
-
-static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	ssize_t ret;
-
-	ret = io_prep_rw(req, sqe);
-	if (ret)
-		return ret;
-
-	if (unlikely(!(req->file->f_mode & FMODE_READ)))
-		return -EBADF;
-
-	/* either don't need iovec imported or already have it */
-	if (!req->async_data)
-		return 0;
-	return io_rw_prep_async(req, READ);
-}
-
-/*
- * This is our waitqueue callback handler, registered through lock_page_async()
- * when we initially tried to do the IO with the iocb armed our waitqueue.
- * This gets called when the page is unlocked, and we generally expect that to
- * happen when the page IO is completed and the page is now uptodate. This will
- * queue a task_work based retry of the operation, attempting to copy the data
- * again. If the latter fails because the page was NOT uptodate, then we will
- * do a thread based blocking retry of the operation. That's the unexpected
- * slow path.
- */
-static int io_async_buf_func(struct wait_queue_entry *wait, unsigned mode,
-			     int sync, void *arg)
-{
-	struct wait_page_queue *wpq;
-	struct io_kiocb *req = wait->private;
-	struct wait_page_key *key = arg;
-	int ret;
-
-	wpq = container_of(wait, struct wait_page_queue, wait);
-
-	if (!wake_page_match(wpq, key))
-		return 0;
-
-	req->rw.kiocb.ki_flags &= ~IOCB_WAITQ;
-	list_del_init(&wait->entry);
-
-	init_task_work(&req->task_work, io_req_task_submit);
-	percpu_ref_get(&req->ctx->refs);
-
-	/* submit ref gets dropped, acquire a new one */
-	refcount_inc(&req->refs);
-	ret = io_req_task_work_add(req, true);
-	if (unlikely(ret)) {
-		struct task_struct *tsk;
-
-		/* queue just for cancelation */
-		init_task_work(&req->task_work, io_req_task_cancel);
-		tsk = io_wq_get_task(req->ctx->io_wq);
-		task_work_add(tsk, &req->task_work, TWA_NONE);
-		wake_up_process(tsk);
-	}
-	return 1;
-}
-
-/*
- * This controls whether a given IO request should be armed for async page
- * based retry. If we return false here, the request is handed to the async
- * worker threads for retry. If we're doing buffered reads on a regular file,
- * we prepare a private wait_page_queue entry and retry the operation. This
- * will either succeed because the page is now uptodate and unlocked, or it
- * will register a callback when the page is unlocked at IO completion. Through
- * that callback, io_uring uses task_work to setup a retry of the operation.
- * That retry will attempt the buffered read again. The retry will generally
- * succeed, or in rare cases where it fails, we then fall back to using the
- * async worker threads for a blocking retry.
- */
-static bool io_rw_should_retry(struct io_kiocb *req)
-{
-	struct io_async_rw *rw = req->async_data;
-	struct wait_page_queue *wait = &rw->wpq;
-	struct kiocb *kiocb = &req->rw.kiocb;
-
-	/* never retry for NOWAIT, we just complete with -EAGAIN */
-	if (req->flags & REQ_F_NOWAIT)
-		return false;
-
-	/* Only for buffered IO */
-	if (kiocb->ki_flags & (IOCB_DIRECT | IOCB_HIPRI))
-		return false;
-
-	/*
-	 * just use poll if we can, and don't attempt if the fs doesn't
-	 * support callback based unlocks
-	 */
-	if (file_can_poll(req->file) || !(req->file->f_mode & FMODE_BUF_RASYNC))
-		return false;
-
-	wait->wait.func = io_async_buf_func;
-	wait->wait.private = req;
-	wait->wait.flags = 0;
-	INIT_LIST_HEAD(&wait->wait.entry);
-	kiocb->ki_flags |= IOCB_WAITQ;
-	kiocb->ki_flags &= ~IOCB_NOWAIT;
-	kiocb->ki_waitq = wait;
-	return true;
-}
-
-static int io_iter_do_read(struct io_kiocb *req, struct iov_iter *iter)
-{
-	if (req->file->f_op->read_iter)
-		return call_read_iter(req->file, &req->rw.kiocb, iter);
-	else if (req->file->f_op->read)
-		return loop_rw_iter(READ, req, iter);
-	else
-		return -EINVAL;
-}
-
-static int io_read(struct io_kiocb *req, bool force_nonblock,
-		   struct io_comp_state *cs)
-{
-	struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
-	struct kiocb *kiocb = &req->rw.kiocb;
-	struct iov_iter __iter, *iter = &__iter;
-	struct iov_iter iter_cp;
-	struct io_async_rw *rw = req->async_data;
-	ssize_t io_size, ret, ret2;
-	bool no_async;
-
-	if (rw)
-		iter = &rw->iter;
-
-	ret = io_import_iovec(READ, req, &iovec, iter, !force_nonblock);
-	if (ret < 0)
-		return ret;
-	iter_cp = *iter;
-	io_size = iov_iter_count(iter);
-	req->result = io_size;
-	ret = 0;
-
-	/* Ensure we clear previously set non-block flag */
-	if (!force_nonblock)
-		kiocb->ki_flags &= ~IOCB_NOWAIT;
-	else
-		kiocb->ki_flags |= IOCB_NOWAIT;
-
-
-	/* If the file doesn't support async, just async punt */
-	no_async = force_nonblock && !io_file_supports_async(req->file, READ);
-	if (no_async)
-		goto copy_iov;
-
-	ret = rw_verify_area(READ, req->file, io_kiocb_ppos(kiocb), io_size);
-	if (unlikely(ret))
-		goto out_free;
-
-	ret = io_iter_do_read(req, iter);
-
-	if (!ret) {
-		goto done;
-	} else if (ret == -EIOCBQUEUED) {
-		ret = 0;
-		goto out_free;
-	} else if (ret == -EAGAIN) {
-		/* IOPOLL retry should happen for io-wq threads */
-		if (!force_nonblock && !(req->ctx->flags & IORING_SETUP_IOPOLL))
-			goto done;
-		/* no retry on NONBLOCK marked file */
-		if (req->file->f_flags & O_NONBLOCK)
-			goto done;
-		/* some cases will consume bytes even on error returns */
-		*iter = iter_cp;
-		ret = 0;
-		goto copy_iov;
-	} else if (ret < 0) {
-		/* make sure -ERESTARTSYS -> -EINTR is done */
-		goto done;
-	}
-
-	/* read it all, or we did blocking attempt. no retry. */
-	if (!iov_iter_count(iter) || !force_nonblock ||
-	    (req->file->f_flags & O_NONBLOCK) || !(req->flags & REQ_F_ISREG))
-		goto done;
-
-	io_size -= ret;
-copy_iov:
-	ret2 = io_setup_async_rw(req, iovec, inline_vecs, iter, true);
-	if (ret2) {
-		ret = ret2;
-		goto out_free;
-	}
-	if (no_async)
-		return -EAGAIN;
-	rw = req->async_data;
-	/* it's copied and will be cleaned with ->io */
-	iovec = NULL;
-	/* now use our persistent iterator, if we aren't already */
-	iter = &rw->iter;
-retry:
-	rw->bytes_done += ret;
-	/* if we can retry, do so with the callbacks armed */
-	if (!io_rw_should_retry(req)) {
-		kiocb->ki_flags &= ~IOCB_WAITQ;
-		return -EAGAIN;
-	}
-
-	/*
-	 * Now retry read with the IOCB_WAITQ parts set in the iocb. If we
-	 * get -EIOCBQUEUED, then we'll get a notification when the desired
-	 * page gets unlocked. We can also get a partial read here, and if we
-	 * do, then just retry at the new offset.
-	 */
-	ret = io_iter_do_read(req, iter);
-	if (ret == -EIOCBQUEUED) {
-		ret = 0;
-		goto out_free;
-	} else if (ret > 0 && ret < io_size) {
-		/* we got some bytes, but not all. retry. */
-		kiocb->ki_flags &= ~IOCB_WAITQ;
-		goto retry;
-	}
-done:
-	kiocb_done(kiocb, ret, cs);
-	ret = 0;
-out_free:
-	/* it's reportedly faster than delegating the null check to kfree() */
-	if (iovec)
-		kfree(iovec);
-	return ret;
-}
-
-static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	ssize_t ret;
-
-	ret = io_prep_rw(req, sqe);
-	if (ret)
-		return ret;
-
-	if (unlikely(!(req->file->f_mode & FMODE_WRITE)))
-		return -EBADF;
-
-	/* either don't need iovec imported or already have it */
-	if (!req->async_data)
-		return 0;
-	return io_rw_prep_async(req, WRITE);
-}
-
-static int io_write(struct io_kiocb *req, bool force_nonblock,
-		    struct io_comp_state *cs)
-{
-	struct iovec inline_vecs[UIO_FASTIOV], *iovec = inline_vecs;
-	struct kiocb *kiocb = &req->rw.kiocb;
-	struct iov_iter __iter, *iter = &__iter;
-	struct iov_iter iter_cp;
-	struct io_async_rw *rw = req->async_data;
-	ssize_t ret, ret2, io_size;
-
-	if (rw)
-		iter = &rw->iter;
-
-	ret = io_import_iovec(WRITE, req, &iovec, iter, !force_nonblock);
-	if (ret < 0)
-		return ret;
-	iter_cp = *iter;
-	io_size = iov_iter_count(iter);
-	req->result = io_size;
-
-	/* Ensure we clear previously set non-block flag */
-	if (!force_nonblock)
-		kiocb->ki_flags &= ~IOCB_NOWAIT;
-	else
-		kiocb->ki_flags |= IOCB_NOWAIT;
-
-	/* If the file doesn't support async, just async punt */
-	if (force_nonblock && !io_file_supports_async(req->file, WRITE))
-		goto copy_iov;
-
-	/* file path doesn't support NOWAIT for non-direct_IO */
-	if (force_nonblock && !(kiocb->ki_flags & IOCB_DIRECT) &&
-	    (req->flags & REQ_F_ISREG))
-		goto copy_iov;
-
-	ret = rw_verify_area(WRITE, req->file, io_kiocb_ppos(kiocb), io_size);
-	if (unlikely(ret))
-		goto out_free;
-
-	/*
-	 * Open-code file_start_write here to grab freeze protection,
-	 * which will be released by another thread in
-	 * io_complete_rw().  Fool lockdep by telling it the lock got
-	 * released so that it doesn't complain about the held lock when
-	 * we return to userspace.
-	 */
-	if (req->flags & REQ_F_ISREG) {
-		sb_start_write(file_inode(req->file)->i_sb);
-		__sb_writers_release(file_inode(req->file)->i_sb,
-					SB_FREEZE_WRITE);
-	}
-	kiocb->ki_flags |= IOCB_WRITE;
-
-	if (req->file->f_op->write_iter)
-		ret2 = call_write_iter(req->file, kiocb, iter);
-	else if (req->file->f_op->write)
-		ret2 = loop_rw_iter(WRITE, req, iter);
-	else
-		ret2 = -EINVAL;
-
-	/*
-	 * Raw bdev writes will return -EOPNOTSUPP for IOCB_NOWAIT. Just
-	 * retry them without IOCB_NOWAIT.
-	 */
-	if (ret2 == -EOPNOTSUPP && (kiocb->ki_flags & IOCB_NOWAIT))
-		ret2 = -EAGAIN;
-	/* no retry on NONBLOCK marked file */
-	if (ret2 == -EAGAIN && (req->file->f_flags & O_NONBLOCK))
-		goto done;
-	if (!force_nonblock || ret2 != -EAGAIN) {
-		/* IOPOLL retry should happen for io-wq threads */
-		if ((req->ctx->flags & IORING_SETUP_IOPOLL) && ret2 == -EAGAIN)
-			goto copy_iov;
-done:
-		kiocb_done(kiocb, ret2, cs);
-	} else {
-copy_iov:
-		/* some cases will consume bytes even on error returns */
-		*iter = iter_cp;
-		ret = io_setup_async_rw(req, iovec, inline_vecs, iter, false);
-		if (!ret)
-			return -EAGAIN;
-	}
-out_free:
-	/* it's reportedly faster than delegating the null check to kfree() */
-	if (iovec)
-		kfree(iovec);
-	return ret;
-}
-
-static int __io_splice_prep(struct io_kiocb *req,
-			    const struct io_uring_sqe *sqe)
-{
-	struct io_splice* sp = &req->splice;
-	unsigned int valid_flags = SPLICE_F_FD_IN_FIXED | SPLICE_F_ALL;
-
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-
-	sp->file_in = NULL;
-	sp->len = READ_ONCE(sqe->len);
-	sp->flags = READ_ONCE(sqe->splice_flags);
-
-	if (unlikely(sp->flags & ~valid_flags))
-		return -EINVAL;
-
-	sp->file_in = io_file_get(NULL, req, READ_ONCE(sqe->splice_fd_in),
-				  (sp->flags & SPLICE_F_FD_IN_FIXED));
-	if (!sp->file_in)
-		return -EBADF;
-	req->flags |= REQ_F_NEED_CLEANUP;
-
-	if (!S_ISREG(file_inode(sp->file_in)->i_mode)) {
-		/*
-		 * Splice operation will be punted aync, and here need to
-		 * modify io_wq_work.flags, so initialize io_wq_work firstly.
-		 */
-		io_req_init_async(req);
-		req->work.flags |= IO_WQ_WORK_UNBOUND;
-	}
-
-	return 0;
-}
-
-static int io_tee_prep(struct io_kiocb *req,
-		       const struct io_uring_sqe *sqe)
-{
-	if (READ_ONCE(sqe->splice_off_in) || READ_ONCE(sqe->off))
-		return -EINVAL;
-	return __io_splice_prep(req, sqe);
-}
-
-static int io_tee(struct io_kiocb *req, bool force_nonblock)
-{
-	struct io_splice *sp = &req->splice;
-	struct file *in = sp->file_in;
-	struct file *out = sp->file_out;
-	unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
-	long ret = 0;
-
-	if (force_nonblock)
-		return -EAGAIN;
-	if (sp->len)
-		ret = do_tee(in, out, sp->len, flags);
-
-	io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED));
-	req->flags &= ~REQ_F_NEED_CLEANUP;
-
-	if (ret != sp->len)
-		req_set_fail_links(req);
-	io_req_complete(req, ret);
-	return 0;
-}
-
-static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	struct io_splice* sp = &req->splice;
-
-	sp->off_in = READ_ONCE(sqe->splice_off_in);
-	sp->off_out = READ_ONCE(sqe->off);
-	return __io_splice_prep(req, sqe);
-}
-
-static int io_splice(struct io_kiocb *req, bool force_nonblock)
-{
-	struct io_splice *sp = &req->splice;
-	struct file *in = sp->file_in;
-	struct file *out = sp->file_out;
-	unsigned int flags = sp->flags & ~SPLICE_F_FD_IN_FIXED;
-	loff_t *poff_in, *poff_out;
-	long ret = 0;
-
-	if (force_nonblock)
-		return -EAGAIN;
-
-	poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
-	poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;
-
-	if (sp->len)
-		ret = do_splice(in, poff_in, out, poff_out, sp->len, flags);
-
-	io_put_file(req, in, (sp->flags & SPLICE_F_FD_IN_FIXED));
-	req->flags &= ~REQ_F_NEED_CLEANUP;
-
-	if (ret != sp->len)
-		req_set_fail_links(req);
-	io_req_complete(req, ret);
-	return 0;
-}
-
-/*
- * IORING_OP_NOP just posts a completion event, nothing else.
- */
-static int io_nop(struct io_kiocb *req, struct io_comp_state *cs)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-
-	if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-
-	__io_req_complete(req, 0, 0, cs);
-	return 0;
-}
-
-static int io_prep_fsync(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-
-	if (!req->file)
-		return -EBADF;
-
-	if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-	if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index ||
-		     sqe->splice_fd_in))
-		return -EINVAL;
-
-	req->sync.flags = READ_ONCE(sqe->fsync_flags);
-	if (unlikely(req->sync.flags & ~IORING_FSYNC_DATASYNC))
-		return -EINVAL;
-
-	req->sync.off = READ_ONCE(sqe->off);
-	req->sync.len = READ_ONCE(sqe->len);
-	return 0;
-}
-
-static int io_fsync(struct io_kiocb *req, bool force_nonblock)
-{
-	loff_t end = req->sync.off + req->sync.len;
-	int ret;
-
-	/* fsync always requires a blocking context */
-	if (force_nonblock)
-		return -EAGAIN;
-
-	ret = vfs_fsync_range(req->file, req->sync.off,
-				end > 0 ? end : LLONG_MAX,
-				req->sync.flags & IORING_FSYNC_DATASYNC);
-	if (ret < 0)
-		req_set_fail_links(req);
-	io_req_complete(req, ret);
-	return 0;
-}
-
-static int io_fallocate_prep(struct io_kiocb *req,
-			     const struct io_uring_sqe *sqe)
-{
-	if (sqe->ioprio || sqe->buf_index || sqe->rw_flags ||
-	    sqe->splice_fd_in)
-		return -EINVAL;
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-
-	req->sync.off = READ_ONCE(sqe->off);
-	req->sync.len = READ_ONCE(sqe->addr);
-	req->sync.mode = READ_ONCE(sqe->len);
-	return 0;
-}
-
-static int io_fallocate(struct io_kiocb *req, bool force_nonblock)
-{
-	int ret;
-
-	/* fallocate always requiring blocking context */
-	if (force_nonblock)
-		return -EAGAIN;
-	ret = vfs_fallocate(req->file, req->sync.mode, req->sync.off,
-				req->sync.len);
-	if (ret < 0)
-		req_set_fail_links(req);
-	io_req_complete(req, ret);
-	return 0;
-}
-
-static int __io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	const char __user *fname;
-	int ret;
-
-	if (unlikely(sqe->ioprio || sqe->buf_index || sqe->splice_fd_in))
-		return -EINVAL;
-	if (unlikely(req->flags & REQ_F_FIXED_FILE))
-		return -EBADF;
-
-	/* open.how should be already initialised */
-	if (!(req->open.how.flags & O_PATH) && force_o_largefile())
-		req->open.how.flags |= O_LARGEFILE;
-
-	req->open.dfd = READ_ONCE(sqe->fd);
-	fname = u64_to_user_ptr(READ_ONCE(sqe->addr));
-	req->open.filename = getname(fname);
-	if (IS_ERR(req->open.filename)) {
-		ret = PTR_ERR(req->open.filename);
-		req->open.filename = NULL;
-		return ret;
-	}
-	req->open.nofile = rlimit(RLIMIT_NOFILE);
-	req->open.ignore_nonblock = false;
-	req->flags |= REQ_F_NEED_CLEANUP;
-	return 0;
-}
-
-static int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	u64 flags, mode;
-
-	if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
-		return -EINVAL;
-	mode = READ_ONCE(sqe->len);
-	flags = READ_ONCE(sqe->open_flags);
-	req->open.how = build_open_how(flags, mode);
-	return __io_openat_prep(req, sqe);
-}
-
-static int io_openat2_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	struct open_how __user *how;
-	size_t len;
-	int ret;
-
-	if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
-		return -EINVAL;
-	how = u64_to_user_ptr(READ_ONCE(sqe->addr2));
-	len = READ_ONCE(sqe->len);
-	if (len < OPEN_HOW_SIZE_VER0)
-		return -EINVAL;
-
-	ret = copy_struct_from_user(&req->open.how, sizeof(req->open.how), how,
-					len);
-	if (ret)
-		return ret;
-
-	return __io_openat_prep(req, sqe);
-}
-
-static int io_openat2(struct io_kiocb *req, bool force_nonblock)
-{
-	struct open_flags op;
-	struct file *file;
-	int ret;
-
-	if (force_nonblock && !req->open.ignore_nonblock)
-		return -EAGAIN;
-
-	ret = build_open_flags(&req->open.how, &op);
-	if (ret)
-		goto err;
-
-	ret = __get_unused_fd_flags(req->open.how.flags, req->open.nofile);
-	if (ret < 0)
-		goto err;
-
-	file = do_filp_open(req->open.dfd, req->open.filename, &op);
-	if (IS_ERR(file)) {
-		put_unused_fd(ret);
-		ret = PTR_ERR(file);
-		/*
-		 * A work-around to ensure that /proc/self works that way
-		 * that it should - if we get -EOPNOTSUPP back, then assume
-		 * that proc_self_get_link() failed us because we're in async
-		 * context. We should be safe to retry this from the task
-		 * itself with force_nonblock == false set, as it should not
-		 * block on lookup. Would be nice to know this upfront and
-		 * avoid the async dance, but doesn't seem feasible.
-		 */
-		if (ret == -EOPNOTSUPP && io_wq_current_is_worker()) {
-			req->open.ignore_nonblock = true;
-			refcount_inc(&req->refs);
-			io_req_task_queue(req);
-			return 0;
-		}
-	} else {
-		fsnotify_open(file);
-		fd_install(ret, file);
-	}
-err:
-	putname(req->open.filename);
-	req->flags &= ~REQ_F_NEED_CLEANUP;
-	if (ret < 0)
-		req_set_fail_links(req);
-	io_req_complete(req, ret);
-	return 0;
-}
-
-static int io_openat(struct io_kiocb *req, bool force_nonblock)
-{
-	return io_openat2(req, force_nonblock);
-}
-
-static int io_remove_buffers_prep(struct io_kiocb *req,
-				  const struct io_uring_sqe *sqe)
-{
-	struct io_provide_buf *p = &req->pbuf;
-	u64 tmp;
-
-	if (sqe->ioprio || sqe->rw_flags || sqe->addr || sqe->len || sqe->off ||
-	    sqe->splice_fd_in)
-		return -EINVAL;
-
-	tmp = READ_ONCE(sqe->fd);
-	if (!tmp || tmp > USHRT_MAX)
-		return -EINVAL;
-
-	memset(p, 0, sizeof(*p));
-	p->nbufs = tmp;
-	p->bgid = READ_ONCE(sqe->buf_group);
-	return 0;
-}
-
-static int __io_remove_buffers(struct io_ring_ctx *ctx, struct io_buffer *buf,
-			       int bgid, unsigned nbufs)
-{
-	unsigned i = 0;
-
-	/* shouldn't happen */
-	if (!nbufs)
-		return 0;
-
-	/* the head kbuf is the list itself */
-	while (!list_empty(&buf->list)) {
-		struct io_buffer *nxt;
-
-		nxt = list_first_entry(&buf->list, struct io_buffer, list);
-		list_del(&nxt->list);
-		kfree(nxt);
-		if (++i == nbufs)
-			return i;
-	}
-	i++;
-	kfree(buf);
-	xa_erase(&ctx->io_buffers, bgid);
-
-	return i;
-}
-
-static int io_remove_buffers(struct io_kiocb *req, bool force_nonblock,
-			     struct io_comp_state *cs)
-{
-	struct io_provide_buf *p = &req->pbuf;
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_buffer *head;
-	int ret = 0;
-
-	io_ring_submit_lock(ctx, !force_nonblock);
-
-	lockdep_assert_held(&ctx->uring_lock);
-
-	ret = -ENOENT;
-	head = xa_load(&ctx->io_buffers, p->bgid);
-	if (head)
-		ret = __io_remove_buffers(ctx, head, p->bgid, p->nbufs);
-	if (ret < 0)
-		req_set_fail_links(req);
-
-	/* need to hold the lock to complete IOPOLL requests */
-	if (ctx->flags & IORING_SETUP_IOPOLL) {
-		__io_req_complete(req, ret, 0, cs);
-		io_ring_submit_unlock(ctx, !force_nonblock);
-	} else {
-		io_ring_submit_unlock(ctx, !force_nonblock);
-		__io_req_complete(req, ret, 0, cs);
-	}
-	return 0;
-}
-
-static int io_provide_buffers_prep(struct io_kiocb *req,
-				   const struct io_uring_sqe *sqe)
-{
-	unsigned long size, tmp_check;
-	struct io_provide_buf *p = &req->pbuf;
-	u64 tmp;
-
-	if (sqe->ioprio || sqe->rw_flags || sqe->splice_fd_in)
-		return -EINVAL;
-
-	tmp = READ_ONCE(sqe->fd);
-	if (!tmp || tmp > USHRT_MAX)
-		return -E2BIG;
-	p->nbufs = tmp;
-	p->addr = READ_ONCE(sqe->addr);
-	p->len = READ_ONCE(sqe->len);
-
-	if (check_mul_overflow((unsigned long)p->len, (unsigned long)p->nbufs,
-				&size))
-		return -EOVERFLOW;
-	if (check_add_overflow((unsigned long)p->addr, size, &tmp_check))
-		return -EOVERFLOW;
-
-	size = (unsigned long)p->len * p->nbufs;
-	if (!access_ok(u64_to_user_ptr(p->addr), size))
-		return -EFAULT;
-
-	p->bgid = READ_ONCE(sqe->buf_group);
-	tmp = READ_ONCE(sqe->off);
-	if (tmp > USHRT_MAX)
-		return -E2BIG;
-	p->bid = tmp;
-	return 0;
-}
-
-static int io_add_buffers(struct io_provide_buf *pbuf, struct io_buffer **head)
-{
-	struct io_buffer *buf;
-	u64 addr = pbuf->addr;
-	int i, bid = pbuf->bid;
-
-	for (i = 0; i < pbuf->nbufs; i++) {
-		buf = kmalloc(sizeof(*buf), GFP_KERNEL_ACCOUNT);
-		if (!buf)
-			break;
-
-		buf->addr = addr;
-		buf->len = min_t(__u32, pbuf->len, MAX_RW_COUNT);
-		buf->bid = bid;
-		addr += pbuf->len;
-		bid++;
-		if (!*head) {
-			INIT_LIST_HEAD(&buf->list);
-			*head = buf;
-		} else {
-			list_add_tail(&buf->list, &(*head)->list);
-		}
-		cond_resched();
-	}
-
-	return i ? i : -ENOMEM;
-}
-
-static int io_provide_buffers(struct io_kiocb *req, bool force_nonblock,
-			      struct io_comp_state *cs)
-{
-	struct io_provide_buf *p = &req->pbuf;
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_buffer *head, *list;
-	int ret = 0;
-
-	io_ring_submit_lock(ctx, !force_nonblock);
-
-	lockdep_assert_held(&ctx->uring_lock);
-
-	list = head = xa_load(&ctx->io_buffers, p->bgid);
-
-	ret = io_add_buffers(p, &head);
-	if (ret >= 0 && !list) {
-		ret = xa_insert(&ctx->io_buffers, p->bgid, head, GFP_KERNEL);
-		if (ret < 0)
-			__io_remove_buffers(ctx, head, p->bgid, -1U);
-	}
-	if (ret < 0)
-		req_set_fail_links(req);
-
-	/* need to hold the lock to complete IOPOLL requests */
-	if (ctx->flags & IORING_SETUP_IOPOLL) {
-		__io_req_complete(req, ret, 0, cs);
-		io_ring_submit_unlock(ctx, !force_nonblock);
-	} else {
-		io_ring_submit_unlock(ctx, !force_nonblock);
-		__io_req_complete(req, ret, 0, cs);
-	}
-	return 0;
-}
-
-static int io_epoll_ctl_prep(struct io_kiocb *req,
-			     const struct io_uring_sqe *sqe)
-{
-#if defined(CONFIG_EPOLL)
-	if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in)
-		return -EINVAL;
-	if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL)))
-		return -EINVAL;
-
-	req->epoll.epfd = READ_ONCE(sqe->fd);
-	req->epoll.op = READ_ONCE(sqe->len);
-	req->epoll.fd = READ_ONCE(sqe->off);
-
-	if (ep_op_has_event(req->epoll.op)) {
-		struct epoll_event __user *ev;
-
-		ev = u64_to_user_ptr(READ_ONCE(sqe->addr));
-		if (copy_from_user(&req->epoll.event, ev, sizeof(*ev)))
-			return -EFAULT;
-	}
-
-	return 0;
-#else
-	return -EOPNOTSUPP;
-#endif
-}
-
-static int io_epoll_ctl(struct io_kiocb *req, bool force_nonblock,
-			struct io_comp_state *cs)
-{
-#if defined(CONFIG_EPOLL)
-	struct io_epoll *ie = &req->epoll;
-	int ret;
-
-	ret = do_epoll_ctl(ie->epfd, ie->op, ie->fd, &ie->event, force_nonblock);
-	if (force_nonblock && ret == -EAGAIN)
-		return -EAGAIN;
-
-	if (ret < 0)
-		req_set_fail_links(req);
-	__io_req_complete(req, ret, 0, cs);
-	return 0;
-#else
-	return -EOPNOTSUPP;
-#endif
-}
-
-static int io_madvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
-	if (sqe->ioprio || sqe->buf_index || sqe->off || sqe->splice_fd_in)
-		return -EINVAL;
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-
-	req->madvise.addr = READ_ONCE(sqe->addr);
-	req->madvise.len = READ_ONCE(sqe->len);
-	req->madvise.advice = READ_ONCE(sqe->fadvise_advice);
-	return 0;
-#else
-	return -EOPNOTSUPP;
-#endif
-}
-
-static int io_madvise(struct io_kiocb *req, bool force_nonblock)
-{
-#if defined(CONFIG_ADVISE_SYSCALLS) && defined(CONFIG_MMU)
-	struct io_madvise *ma = &req->madvise;
-	int ret;
-
-	if (force_nonblock)
-		return -EAGAIN;
-
-	ret = do_madvise(current->mm, ma->addr, ma->len, ma->advice);
-	if (ret < 0)
-		req_set_fail_links(req);
-	io_req_complete(req, ret);
-	return 0;
-#else
-	return -EOPNOTSUPP;
-#endif
-}
-
-static int io_fadvise_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	if (sqe->ioprio || sqe->buf_index || sqe->addr || sqe->splice_fd_in)
-		return -EINVAL;
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-
-	req->fadvise.offset = READ_ONCE(sqe->off);
-	req->fadvise.len = READ_ONCE(sqe->len);
-	req->fadvise.advice = READ_ONCE(sqe->fadvise_advice);
-	return 0;
-}
-
-static int io_fadvise(struct io_kiocb *req, bool force_nonblock)
-{
-	struct io_fadvise *fa = &req->fadvise;
-	int ret;
-
-	if (force_nonblock) {
-		switch (fa->advice) {
-		case POSIX_FADV_NORMAL:
-		case POSIX_FADV_RANDOM:
-		case POSIX_FADV_SEQUENTIAL:
-			break;
-		default:
-			return -EAGAIN;
-		}
-	}
-
-	ret = vfs_fadvise(req->file, fa->offset, fa->len, fa->advice);
-	if (ret < 0)
-		req_set_fail_links(req);
-	io_req_complete(req, ret);
-	return 0;
-}
-
-static int io_statx_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL)))
-		return -EINVAL;
-	if (sqe->ioprio || sqe->buf_index || sqe->splice_fd_in)
-		return -EINVAL;
-	if (req->flags & REQ_F_FIXED_FILE)
-		return -EBADF;
-
-	req->statx.dfd = READ_ONCE(sqe->fd);
-	req->statx.mask = READ_ONCE(sqe->len);
-	req->statx.filename = u64_to_user_ptr(READ_ONCE(sqe->addr));
-	req->statx.buffer = u64_to_user_ptr(READ_ONCE(sqe->addr2));
-	req->statx.flags = READ_ONCE(sqe->statx_flags);
-
-	return 0;
-}
-
-static int io_statx(struct io_kiocb *req, bool force_nonblock)
-{
-	struct io_statx *ctx = &req->statx;
-	int ret;
-
-	if (force_nonblock)
-		return -EAGAIN;
-
-	ret = do_statx(ctx->dfd, ctx->filename, ctx->flags, ctx->mask,
-		       ctx->buffer);
-
-	if (ret < 0)
-		req_set_fail_links(req);
-	io_req_complete(req, ret);
-	return 0;
-}
-
-static int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	/*
-	 * If we queue this for async, it must not be cancellable. That would
-	 * leave the 'file' in an undeterminate state, and here need to modify
-	 * io_wq_work.flags, so initialize io_wq_work firstly.
-	 */
-	io_req_init_async(req);
-
-	if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
-		return -EINVAL;
-	if (sqe->ioprio || sqe->off || sqe->addr || sqe->len ||
-	    sqe->rw_flags || sqe->buf_index || sqe->splice_fd_in)
-		return -EINVAL;
-	if (req->flags & REQ_F_FIXED_FILE)
-		return -EBADF;
-
-	req->close.fd = READ_ONCE(sqe->fd);
-	if ((req->file && req->file->f_op == &io_uring_fops))
-		return -EBADF;
-
-	req->close.put_file = NULL;
-	return 0;
-}
-
-static int io_close(struct io_kiocb *req, bool force_nonblock,
-		    struct io_comp_state *cs)
-{
-	struct io_close *close = &req->close;
-	int ret;
-
-	/* might be already done during nonblock submission */
-	if (!close->put_file) {
-		ret = close_fd_get_file(close->fd, &close->put_file);
-		if (ret < 0)
-			return (ret == -ENOENT) ? -EBADF : ret;
-	}
-
-	/* if the file has a flush method, be safe and punt to async */
-	if (close->put_file->f_op->flush && force_nonblock) {
-		/* not safe to cancel at this point */
-		req->work.flags |= IO_WQ_WORK_NO_CANCEL;
-		/* was never set, but play safe */
-		req->flags &= ~REQ_F_NOWAIT;
-		/* avoid grabbing files - we don't need the files */
-		req->flags |= REQ_F_NO_FILE_TABLE;
-		return -EAGAIN;
-	}
-
-	/* No ->flush() or already async, safely close from here */
-	ret = filp_close(close->put_file, req->work.identity->files);
-	if (ret < 0)
-		req_set_fail_links(req);
-	fput(close->put_file);
-	close->put_file = NULL;
-	__io_req_complete(req, ret, 0, cs);
-	return 0;
-}
-
-static int io_prep_sfr(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-
-	if (!req->file)
-		return -EBADF;
-
-	if (unlikely(ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-	if (unlikely(sqe->addr || sqe->ioprio || sqe->buf_index ||
-		     sqe->splice_fd_in))
-		return -EINVAL;
-
-	req->sync.off = READ_ONCE(sqe->off);
-	req->sync.len = READ_ONCE(sqe->len);
-	req->sync.flags = READ_ONCE(sqe->sync_range_flags);
-	return 0;
-}
-
-static int io_sync_file_range(struct io_kiocb *req, bool force_nonblock)
-{
-	int ret;
-
-	/* sync_file_range always requires a blocking context */
-	if (force_nonblock)
-		return -EAGAIN;
-
-	ret = sync_file_range(req->file, req->sync.off, req->sync.len,
-				req->sync.flags);
-	if (ret < 0)
-		req_set_fail_links(req);
-	io_req_complete(req, ret);
-	return 0;
-}
-
-#if defined(CONFIG_NET)
-static int io_setup_async_msg(struct io_kiocb *req,
-			      struct io_async_msghdr *kmsg)
-{
-	struct io_async_msghdr *async_msg = req->async_data;
-
-	if (async_msg)
-		return -EAGAIN;
-	if (io_alloc_async_data(req)) {
-		if (kmsg->iov != kmsg->fast_iov)
-			kfree(kmsg->iov);
-		return -ENOMEM;
-	}
-	async_msg = req->async_data;
-	req->flags |= REQ_F_NEED_CLEANUP;
-	memcpy(async_msg, kmsg, sizeof(*kmsg));
-	return -EAGAIN;
-}
-
-static int io_sendmsg_copy_hdr(struct io_kiocb *req,
-			       struct io_async_msghdr *iomsg)
-{
-	iomsg->iov = iomsg->fast_iov;
-	iomsg->msg.msg_name = &iomsg->addr;
-	return sendmsg_copy_msghdr(&iomsg->msg, req->sr_msg.umsg,
-				   req->sr_msg.msg_flags, &iomsg->iov);
-}
-
-static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	struct io_async_msghdr *async_msg = req->async_data;
-	struct io_sr_msg *sr = &req->sr_msg;
-	int ret;
-
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-	if (unlikely(sqe->addr2 || sqe->splice_fd_in || sqe->ioprio))
-		return -EINVAL;
-
-	sr->msg_flags = READ_ONCE(sqe->msg_flags);
-	sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
-	sr->len = READ_ONCE(sqe->len);
-
-#ifdef CONFIG_COMPAT
-	if (req->ctx->compat)
-		sr->msg_flags |= MSG_CMSG_COMPAT;
-#endif
-
-	if (!async_msg || !io_op_defs[req->opcode].needs_async_data)
-		return 0;
-	ret = io_sendmsg_copy_hdr(req, async_msg);
-	if (!ret)
-		req->flags |= REQ_F_NEED_CLEANUP;
-	return ret;
-}
-
-static int io_sendmsg(struct io_kiocb *req, bool force_nonblock,
-		      struct io_comp_state *cs)
-{
-	struct io_async_msghdr iomsg, *kmsg;
-	struct socket *sock;
-	unsigned flags;
-	int min_ret = 0;
-	int ret;
-
-	sock = sock_from_file(req->file, &ret);
-	if (unlikely(!sock))
-		return ret;
-
-	if (req->async_data) {
-		kmsg = req->async_data;
-		kmsg->msg.msg_name = &kmsg->addr;
-		/* if iov is set, it's allocated already */
-		if (!kmsg->iov)
-			kmsg->iov = kmsg->fast_iov;
-		kmsg->msg.msg_iter.iov = kmsg->iov;
-	} else {
-		ret = io_sendmsg_copy_hdr(req, &iomsg);
-		if (ret)
-			return ret;
-		kmsg = &iomsg;
-	}
-
-	flags = req->sr_msg.msg_flags | MSG_NOSIGNAL;
-	if (flags & MSG_DONTWAIT)
-		req->flags |= REQ_F_NOWAIT;
-	else if (force_nonblock)
-		flags |= MSG_DONTWAIT;
-
-	if (flags & MSG_WAITALL)
-		min_ret = iov_iter_count(&kmsg->msg.msg_iter);
-
-	ret = __sys_sendmsg_sock(sock, &kmsg->msg, flags);
-	if (force_nonblock && ret == -EAGAIN)
-		return io_setup_async_msg(req, kmsg);
-	if (ret == -ERESTARTSYS)
-		ret = -EINTR;
-
-	if (kmsg->iov != kmsg->fast_iov)
-		kfree(kmsg->iov);
-	req->flags &= ~REQ_F_NEED_CLEANUP;
-	if (ret < min_ret)
-		req_set_fail_links(req);
-	__io_req_complete(req, ret, 0, cs);
-	return 0;
-}
-
-static int io_send(struct io_kiocb *req, bool force_nonblock,
-		   struct io_comp_state *cs)
-{
-	struct io_sr_msg *sr = &req->sr_msg;
-	struct msghdr msg;
-	struct iovec iov;
-	struct socket *sock;
-	unsigned flags;
-	int min_ret = 0;
-	int ret;
-
-	sock = sock_from_file(req->file, &ret);
-	if (unlikely(!sock))
-		return ret;
-
-	ret = import_single_range(WRITE, sr->buf, sr->len, &iov, &msg.msg_iter);
-	if (unlikely(ret))
-		return ret;
-
-	msg.msg_name = NULL;
-	msg.msg_control = NULL;
-	msg.msg_controllen = 0;
-	msg.msg_namelen = 0;
-
-	flags = req->sr_msg.msg_flags | MSG_NOSIGNAL;
-	if (flags & MSG_DONTWAIT)
-		req->flags |= REQ_F_NOWAIT;
-	else if (force_nonblock)
-		flags |= MSG_DONTWAIT;
-
-	if (flags & MSG_WAITALL)
-		min_ret = iov_iter_count(&msg.msg_iter);
-
-	msg.msg_flags = flags;
-	ret = sock_sendmsg(sock, &msg);
-	if (force_nonblock && ret == -EAGAIN)
-		return -EAGAIN;
-	if (ret == -ERESTARTSYS)
-		ret = -EINTR;
-
-	if (ret < min_ret)
-		req_set_fail_links(req);
-	__io_req_complete(req, ret, 0, cs);
-	return 0;
-}
-
-static int __io_recvmsg_copy_hdr(struct io_kiocb *req,
-				 struct io_async_msghdr *iomsg)
-{
-	struct io_sr_msg *sr = &req->sr_msg;
-	struct iovec __user *uiov;
-	size_t iov_len;
-	int ret;
-
-	ret = __copy_msghdr_from_user(&iomsg->msg, sr->umsg,
-					&iomsg->uaddr, &uiov, &iov_len);
-	if (ret)
-		return ret;
-
-	if (req->flags & REQ_F_BUFFER_SELECT) {
-		if (iov_len > 1)
-			return -EINVAL;
-		if (copy_from_user(iomsg->iov, uiov, sizeof(*uiov)))
-			return -EFAULT;
-		sr->len = iomsg->iov[0].iov_len;
-		iov_iter_init(&iomsg->msg.msg_iter, READ, iomsg->iov, 1,
-				sr->len);
-		iomsg->iov = NULL;
-	} else {
-		ret = __import_iovec(READ, uiov, iov_len, UIO_FASTIOV,
-				     &iomsg->iov, &iomsg->msg.msg_iter,
-				     false);
-		if (ret > 0)
-			ret = 0;
-	}
-
-	return ret;
-}
-
-#ifdef CONFIG_COMPAT
-static int __io_compat_recvmsg_copy_hdr(struct io_kiocb *req,
-					struct io_async_msghdr *iomsg)
-{
-	struct compat_msghdr __user *msg_compat;
-	struct io_sr_msg *sr = &req->sr_msg;
-	struct compat_iovec __user *uiov;
-	compat_uptr_t ptr;
-	compat_size_t len;
-	int ret;
-
-	msg_compat = (struct compat_msghdr __user *) sr->umsg;
-	ret = __get_compat_msghdr(&iomsg->msg, msg_compat, &iomsg->uaddr,
-					&ptr, &len);
-	if (ret)
-		return ret;
-
-	uiov = compat_ptr(ptr);
-	if (req->flags & REQ_F_BUFFER_SELECT) {
-		compat_ssize_t clen;
-
-		if (len > 1)
-			return -EINVAL;
-		if (!access_ok(uiov, sizeof(*uiov)))
-			return -EFAULT;
-		if (__get_user(clen, &uiov->iov_len))
-			return -EFAULT;
-		if (clen < 0)
-			return -EINVAL;
-		sr->len = clen;
-		iomsg->iov[0].iov_len = clen;
-		iomsg->iov = NULL;
-	} else {
-		ret = __import_iovec(READ, (struct iovec __user *)uiov, len,
-				   UIO_FASTIOV, &iomsg->iov,
-				   &iomsg->msg.msg_iter, true);
-		if (ret < 0)
-			return ret;
-	}
-
-	return 0;
-}
-#endif
-
-static int io_recvmsg_copy_hdr(struct io_kiocb *req,
-			       struct io_async_msghdr *iomsg)
-{
-	iomsg->msg.msg_name = &iomsg->addr;
-	iomsg->iov = iomsg->fast_iov;
-
-#ifdef CONFIG_COMPAT
-	if (req->ctx->compat)
-		return __io_compat_recvmsg_copy_hdr(req, iomsg);
-#endif
-
-	return __io_recvmsg_copy_hdr(req, iomsg);
-}
-
-static struct io_buffer *io_recv_buffer_select(struct io_kiocb *req,
-					       bool needs_lock)
-{
-	struct io_sr_msg *sr = &req->sr_msg;
-	struct io_buffer *kbuf;
-
-	kbuf = io_buffer_select(req, &sr->len, sr->bgid, sr->kbuf, needs_lock);
-	if (IS_ERR(kbuf))
-		return kbuf;
-
-	sr->kbuf = kbuf;
-	req->flags |= REQ_F_BUFFER_SELECTED;
-	return kbuf;
-}
-
-static inline unsigned int io_put_recv_kbuf(struct io_kiocb *req)
-{
-	return io_put_kbuf(req, req->sr_msg.kbuf);
-}
-
-static int io_recvmsg_prep(struct io_kiocb *req,
-			   const struct io_uring_sqe *sqe)
-{
-	struct io_async_msghdr *async_msg = req->async_data;
-	struct io_sr_msg *sr = &req->sr_msg;
-	int ret;
-
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-	if (unlikely(sqe->addr2 || sqe->splice_fd_in || sqe->ioprio))
-		return -EINVAL;
-
-	sr->msg_flags = READ_ONCE(sqe->msg_flags);
-	sr->umsg = u64_to_user_ptr(READ_ONCE(sqe->addr));
-	sr->len = READ_ONCE(sqe->len);
-	sr->bgid = READ_ONCE(sqe->buf_group);
-
-#ifdef CONFIG_COMPAT
-	if (req->ctx->compat)
-		sr->msg_flags |= MSG_CMSG_COMPAT;
-#endif
-
-	if (!async_msg || !io_op_defs[req->opcode].needs_async_data)
-		return 0;
-	ret = io_recvmsg_copy_hdr(req, async_msg);
-	if (!ret)
-		req->flags |= REQ_F_NEED_CLEANUP;
-	return ret;
-}
-
-static int io_recvmsg(struct io_kiocb *req, bool force_nonblock,
-		      struct io_comp_state *cs)
-{
-	struct io_async_msghdr iomsg, *kmsg;
-	struct socket *sock;
-	struct io_buffer *kbuf;
-	unsigned flags;
-	int min_ret = 0;
-	int ret, cflags = 0;
-
-	sock = sock_from_file(req->file, &ret);
-	if (unlikely(!sock))
-		return ret;
-
-	if (req->async_data) {
-		kmsg = req->async_data;
-		kmsg->msg.msg_name = &kmsg->addr;
-		/* if iov is set, it's allocated already */
-		if (!kmsg->iov)
-			kmsg->iov = kmsg->fast_iov;
-		kmsg->msg.msg_iter.iov = kmsg->iov;
-	} else {
-		ret = io_recvmsg_copy_hdr(req, &iomsg);
-		if (ret)
-			return ret;
-		kmsg = &iomsg;
-	}
-
-	if (req->flags & REQ_F_BUFFER_SELECT) {
-		kbuf = io_recv_buffer_select(req, !force_nonblock);
-		if (IS_ERR(kbuf))
-			return PTR_ERR(kbuf);
-		kmsg->fast_iov[0].iov_base = u64_to_user_ptr(kbuf->addr);
-		iov_iter_init(&kmsg->msg.msg_iter, READ, kmsg->iov,
-				1, req->sr_msg.len);
-	}
-
-	flags = req->sr_msg.msg_flags | MSG_NOSIGNAL;
-	if (flags & MSG_DONTWAIT)
-		req->flags |= REQ_F_NOWAIT;
-	else if (force_nonblock)
-		flags |= MSG_DONTWAIT;
-
-	if (flags & MSG_WAITALL)
-		min_ret = iov_iter_count(&kmsg->msg.msg_iter);
-
-	ret = __sys_recvmsg_sock(sock, &kmsg->msg, req->sr_msg.umsg,
-					kmsg->uaddr, flags);
-	if (force_nonblock && ret == -EAGAIN)
-		return io_setup_async_msg(req, kmsg);
-	if (ret == -ERESTARTSYS)
-		ret = -EINTR;
-
-	if (req->flags & REQ_F_BUFFER_SELECTED)
-		cflags = io_put_recv_kbuf(req);
-	if (kmsg->iov != kmsg->fast_iov)
-		kfree(kmsg->iov);
-	req->flags &= ~REQ_F_NEED_CLEANUP;
-	if (ret < min_ret || ((flags & MSG_WAITALL) && (kmsg->msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))))
-		req_set_fail_links(req);
-	__io_req_complete(req, ret, cflags, cs);
-	return 0;
-}
-
-static int io_recv(struct io_kiocb *req, bool force_nonblock,
-		   struct io_comp_state *cs)
-{
-	struct io_buffer *kbuf;
-	struct io_sr_msg *sr = &req->sr_msg;
-	struct msghdr msg;
-	void __user *buf = sr->buf;
-	struct socket *sock;
-	struct iovec iov;
-	unsigned flags;
-	int min_ret = 0;
-	int ret, cflags = 0;
-
-	sock = sock_from_file(req->file, &ret);
-	if (unlikely(!sock))
-		return ret;
-
-	if (req->flags & REQ_F_BUFFER_SELECT) {
-		kbuf = io_recv_buffer_select(req, !force_nonblock);
-		if (IS_ERR(kbuf))
-			return PTR_ERR(kbuf);
-		buf = u64_to_user_ptr(kbuf->addr);
-	}
-
-	ret = import_single_range(READ, buf, sr->len, &iov, &msg.msg_iter);
-	if (unlikely(ret))
-		goto out_free;
-
-	msg.msg_name = NULL;
-	msg.msg_control = NULL;
-	msg.msg_controllen = 0;
-	msg.msg_namelen = 0;
-	msg.msg_iocb = NULL;
-	msg.msg_flags = 0;
-
-	flags = req->sr_msg.msg_flags | MSG_NOSIGNAL;
-	if (flags & MSG_DONTWAIT)
-		req->flags |= REQ_F_NOWAIT;
-	else if (force_nonblock)
-		flags |= MSG_DONTWAIT;
-
-	if (flags & MSG_WAITALL)
-		min_ret = iov_iter_count(&msg.msg_iter);
-
-	ret = sock_recvmsg(sock, &msg, flags);
-	if (force_nonblock && ret == -EAGAIN)
-		return -EAGAIN;
-	if (ret == -ERESTARTSYS)
-		ret = -EINTR;
-out_free:
-	if (req->flags & REQ_F_BUFFER_SELECTED)
-		cflags = io_put_recv_kbuf(req);
-	if (ret < min_ret || ((flags & MSG_WAITALL) && (msg.msg_flags & (MSG_TRUNC | MSG_CTRUNC))))
-		req_set_fail_links(req);
-	__io_req_complete(req, ret, cflags, cs);
-	return 0;
-}
-
-static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	struct io_accept *accept = &req->accept;
-
-	if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
-		return -EINVAL;
-	if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->splice_fd_in)
-		return -EINVAL;
-
-	accept->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
-	accept->addr_len = u64_to_user_ptr(READ_ONCE(sqe->addr2));
-	accept->flags = READ_ONCE(sqe->accept_flags);
-	accept->nofile = rlimit(RLIMIT_NOFILE);
-	return 0;
-}
-
-static int io_accept(struct io_kiocb *req, bool force_nonblock,
-		     struct io_comp_state *cs)
-{
-	struct io_accept *accept = &req->accept;
-	unsigned int file_flags = force_nonblock ? O_NONBLOCK : 0;
-	int ret;
-
-	if (req->file->f_flags & O_NONBLOCK)
-		req->flags |= REQ_F_NOWAIT;
-
-	ret = __sys_accept4_file(req->file, file_flags, accept->addr,
-					accept->addr_len, accept->flags,
-					accept->nofile);
-	if (ret == -EAGAIN && force_nonblock)
-		return -EAGAIN;
-	if (ret < 0) {
-		if (ret == -ERESTARTSYS)
-			ret = -EINTR;
-		req_set_fail_links(req);
-	}
-	__io_req_complete(req, ret, 0, cs);
-	return 0;
-}
-
-static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	struct io_connect *conn = &req->connect;
-	struct io_async_connect *io = req->async_data;
-
-	if (unlikely(req->ctx->flags & (IORING_SETUP_IOPOLL|IORING_SETUP_SQPOLL)))
-		return -EINVAL;
-	if (sqe->ioprio || sqe->len || sqe->buf_index || sqe->rw_flags ||
-	    sqe->splice_fd_in)
-		return -EINVAL;
-
-	conn->addr = u64_to_user_ptr(READ_ONCE(sqe->addr));
-	conn->addr_len =  READ_ONCE(sqe->addr2);
-
-	if (!io)
-		return 0;
-
-	return move_addr_to_kernel(conn->addr, conn->addr_len,
-					&io->address);
-}
-
-static int io_connect(struct io_kiocb *req, bool force_nonblock,
-		      struct io_comp_state *cs)
-{
-	struct io_async_connect __io, *io;
-	unsigned file_flags;
-	int ret;
-
-	if (req->async_data) {
-		io = req->async_data;
-	} else {
-		ret = move_addr_to_kernel(req->connect.addr,
-						req->connect.addr_len,
-						&__io.address);
-		if (ret)
-			goto out;
-		io = &__io;
-	}
-
-	file_flags = force_nonblock ? O_NONBLOCK : 0;
-
-	ret = __sys_connect_file(req->file, &io->address,
-					req->connect.addr_len, file_flags);
-	if ((ret == -EAGAIN || ret == -EINPROGRESS) && force_nonblock) {
-		if (req->async_data)
-			return -EAGAIN;
-		if (io_alloc_async_data(req)) {
-			ret = -ENOMEM;
-			goto out;
-		}
-		io = req->async_data;
-		memcpy(req->async_data, &__io, sizeof(__io));
-		return -EAGAIN;
-	}
-	if (ret == -ERESTARTSYS)
-		ret = -EINTR;
-out:
-	if (ret < 0)
-		req_set_fail_links(req);
-	__io_req_complete(req, ret, 0, cs);
-	return 0;
-}
-#else /* !CONFIG_NET */
-static int io_sendmsg_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	return -EOPNOTSUPP;
-}
-
-static int io_sendmsg(struct io_kiocb *req, bool force_nonblock,
-		      struct io_comp_state *cs)
-{
-	return -EOPNOTSUPP;
-}
-
-static int io_send(struct io_kiocb *req, bool force_nonblock,
-		   struct io_comp_state *cs)
-{
-	return -EOPNOTSUPP;
-}
-
-static int io_recvmsg_prep(struct io_kiocb *req,
-			   const struct io_uring_sqe *sqe)
-{
-	return -EOPNOTSUPP;
-}
-
-static int io_recvmsg(struct io_kiocb *req, bool force_nonblock,
-		      struct io_comp_state *cs)
-{
-	return -EOPNOTSUPP;
-}
-
-static int io_recv(struct io_kiocb *req, bool force_nonblock,
-		   struct io_comp_state *cs)
-{
-	return -EOPNOTSUPP;
-}
-
-static int io_accept_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	return -EOPNOTSUPP;
-}
-
-static int io_accept(struct io_kiocb *req, bool force_nonblock,
-		     struct io_comp_state *cs)
-{
-	return -EOPNOTSUPP;
-}
-
-static int io_connect_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	return -EOPNOTSUPP;
-}
-
-static int io_connect(struct io_kiocb *req, bool force_nonblock,
-		      struct io_comp_state *cs)
-{
-	return -EOPNOTSUPP;
-}
-#endif /* CONFIG_NET */
-
-struct io_poll_table {
-	struct poll_table_struct pt;
-	struct io_kiocb *req;
-	int nr_entries;
-	int error;
-};
-
-static int __io_async_wake(struct io_kiocb *req, struct io_poll_iocb *poll,
-			   __poll_t mask, task_work_func_t func)
-{
-	bool twa_signal_ok;
-	int ret;
-
-	/* for instances that support it check for an event match first: */
-	if (mask && !(mask & poll->events))
-		return 0;
-
-	trace_io_uring_task_add(req->ctx, req->opcode, req->user_data, mask);
-
-	list_del_init(&poll->wait.entry);
-
-	req->result = mask;
-	init_task_work(&req->task_work, func);
-	percpu_ref_get(&req->ctx->refs);
-
-	/*
-	 * If we using the signalfd wait_queue_head for this wakeup, then
-	 * it's not safe to use TWA_SIGNAL as we could be recursing on the
-	 * tsk->sighand->siglock on doing the wakeup. Should not be needed
-	 * either, as the normal wakeup will suffice.
-	 */
-	twa_signal_ok = (poll->head != &req->task->sighand->signalfd_wqh);
-
-	/*
-	 * If this fails, then the task is exiting. When a task exits, the
-	 * work gets canceled, so just cancel this request as well instead
-	 * of executing it. We can't safely execute it anyway, as we may not
-	 * have the needed state needed for it anyway.
-	 */
-	ret = io_req_task_work_add(req, twa_signal_ok);
-	if (unlikely(ret)) {
-		struct task_struct *tsk;
-
-		WRITE_ONCE(poll->canceled, true);
-		tsk = io_wq_get_task(req->ctx->io_wq);
-		task_work_add(tsk, &req->task_work, TWA_NONE);
-		wake_up_process(tsk);
-	}
-	return 1;
-}
-
-static bool io_poll_rewait(struct io_kiocb *req, struct io_poll_iocb *poll)
-	__acquires(&req->ctx->completion_lock)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-
-	if (!req->result && !READ_ONCE(poll->canceled)) {
-		struct poll_table_struct pt = { ._key = poll->events };
-
-		req->result = vfs_poll(req->file, &pt) & poll->events;
-	}
-
-	spin_lock_irq(&ctx->completion_lock);
-	if (!req->result && !READ_ONCE(poll->canceled)) {
-		add_wait_queue(poll->head, &poll->wait);
-		return true;
-	}
-
-	return false;
-}
-
-static struct io_poll_iocb *io_poll_get_double(struct io_kiocb *req)
-{
-	/* pure poll stashes this in ->async_data, poll driven retry elsewhere */
-	if (req->opcode == IORING_OP_POLL_ADD)
-		return req->async_data;
-	return req->apoll->double_poll;
-}
-
-static struct io_poll_iocb *io_poll_get_single(struct io_kiocb *req)
-{
-	if (req->opcode == IORING_OP_POLL_ADD)
-		return &req->poll;
-	return &req->apoll->poll;
-}
-
-static void io_poll_remove_double(struct io_kiocb *req)
-{
-	struct io_poll_iocb *poll = io_poll_get_double(req);
-
-	lockdep_assert_held(&req->ctx->completion_lock);
-
-	if (poll && poll->head) {
-		struct wait_queue_head *head = poll->head;
-
-		spin_lock(&head->lock);
-		list_del_init(&poll->wait.entry);
-		if (poll->wait.private)
-			refcount_dec(&req->refs);
-		poll->head = NULL;
-		spin_unlock(&head->lock);
-	}
-}
-
-static void io_poll_complete(struct io_kiocb *req, __poll_t mask, int error)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-
-	io_poll_remove_double(req);
-	req->poll.done = true;
-	io_cqring_fill_event(req, error ? error : mangle_poll(mask));
-	io_commit_cqring(ctx);
-}
-
-static void io_poll_task_func(struct callback_head *cb)
-{
-	struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_kiocb *nxt;
-
-	if (io_poll_rewait(req, &req->poll)) {
-		spin_unlock_irq(&ctx->completion_lock);
-	} else {
-		hash_del(&req->hash_node);
-		io_poll_complete(req, req->result, 0);
-		spin_unlock_irq(&ctx->completion_lock);
-
-		nxt = io_put_req_find_next(req);
-		io_cqring_ev_posted(ctx);
-		if (nxt)
-			__io_req_task_submit(nxt);
-	}
-
-	percpu_ref_put(&ctx->refs);
-}
-
-static int io_poll_double_wake(struct wait_queue_entry *wait, unsigned mode,
-			       int sync, void *key)
-{
-	struct io_kiocb *req = wait->private;
-	struct io_poll_iocb *poll = io_poll_get_single(req);
-	__poll_t mask = key_to_poll(key);
-
-	/* for instances that support it check for an event match first: */
-	if (mask && !(mask & poll->events))
-		return 0;
-
-	list_del_init(&wait->entry);
-
-	if (poll && poll->head) {
-		bool done;
-
-		spin_lock(&poll->head->lock);
-		done = list_empty(&poll->wait.entry);
-		if (!done)
-			list_del_init(&poll->wait.entry);
-		/* make sure double remove sees this as being gone */
-		wait->private = NULL;
-		spin_unlock(&poll->head->lock);
-		if (!done) {
-			/* use wait func handler, so it matches the rq type */
-			poll->wait.func(&poll->wait, mode, sync, key);
-		}
-	}
-	refcount_dec(&req->refs);
-	return 1;
-}
-
-static void io_init_poll_iocb(struct io_poll_iocb *poll, __poll_t events,
-			      wait_queue_func_t wake_func)
-{
-	poll->head = NULL;
-	poll->done = false;
-	poll->canceled = false;
-	poll->events = events;
-	INIT_LIST_HEAD(&poll->wait.entry);
-	init_waitqueue_func_entry(&poll->wait, wake_func);
-}
-
-static void __io_queue_proc(struct io_poll_iocb *poll, struct io_poll_table *pt,
-			    struct wait_queue_head *head,
-			    struct io_poll_iocb **poll_ptr)
-{
-	struct io_kiocb *req = pt->req;
-
-	/*
-	 * The file being polled uses multiple waitqueues for poll handling
-	 * (e.g. one for read, one for write). Setup a separate io_poll_iocb
-	 * if this happens.
-	 */
-	if (unlikely(pt->nr_entries)) {
-		struct io_poll_iocb *poll_one = poll;
-
-		/* already have a 2nd entry, fail a third attempt */
-		if (*poll_ptr) {
-			pt->error = -EINVAL;
-			return;
-		}
-		/* double add on the same waitqueue head, ignore */
-		if (poll->head == head)
-			return;
-		poll = kmalloc(sizeof(*poll), GFP_ATOMIC);
-		if (!poll) {
-			pt->error = -ENOMEM;
-			return;
-		}
-		io_init_poll_iocb(poll, poll_one->events, io_poll_double_wake);
-		refcount_inc(&req->refs);
-		poll->wait.private = req;
-		*poll_ptr = poll;
-	}
-
-	pt->nr_entries++;
-	poll->head = head;
-
-	if (poll->events & EPOLLEXCLUSIVE)
-		add_wait_queue_exclusive(head, &poll->wait);
-	else
-		add_wait_queue(head, &poll->wait);
-}
-
-static void io_async_queue_proc(struct file *file, struct wait_queue_head *head,
-			       struct poll_table_struct *p)
-{
-	struct io_poll_table *pt = container_of(p, struct io_poll_table, pt);
-	struct async_poll *apoll = pt->req->apoll;
-
-	__io_queue_proc(&apoll->poll, pt, head, &apoll->double_poll);
-}
-
-static void io_async_task_func(struct callback_head *cb)
-{
-	struct io_kiocb *req = container_of(cb, struct io_kiocb, task_work);
-	struct async_poll *apoll = req->apoll;
-	struct io_ring_ctx *ctx = req->ctx;
-
-	trace_io_uring_task_run(req->ctx, req->opcode, req->user_data);
-
-	if (io_poll_rewait(req, &apoll->poll)) {
-		spin_unlock_irq(&ctx->completion_lock);
-		percpu_ref_put(&ctx->refs);
-		return;
-	}
-
-	/* If req is still hashed, it cannot have been canceled. Don't check. */
-	if (hash_hashed(&req->hash_node))
-		hash_del(&req->hash_node);
-
-	io_poll_remove_double(req);
-	spin_unlock_irq(&ctx->completion_lock);
-
-	if (!READ_ONCE(apoll->poll.canceled))
-		__io_req_task_submit(req);
-	else
-		__io_req_task_cancel(req, -ECANCELED);
-
-	percpu_ref_put(&ctx->refs);
-	kfree(apoll->double_poll);
-	kfree(apoll);
-}
-
-static int io_async_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
-			void *key)
-{
-	struct io_kiocb *req = wait->private;
-	struct io_poll_iocb *poll = &req->apoll->poll;
-
-	trace_io_uring_poll_wake(req->ctx, req->opcode, req->user_data,
-					key_to_poll(key));
-
-	return __io_async_wake(req, poll, key_to_poll(key), io_async_task_func);
-}
-
-static void io_poll_req_insert(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	struct hlist_head *list;
-
-	list = &ctx->cancel_hash[hash_long(req->user_data, ctx->cancel_hash_bits)];
-	hlist_add_head(&req->hash_node, list);
-}
-
-static __poll_t __io_arm_poll_handler(struct io_kiocb *req,
-				      struct io_poll_iocb *poll,
-				      struct io_poll_table *ipt, __poll_t mask,
-				      wait_queue_func_t wake_func)
-	__acquires(&ctx->completion_lock)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	bool cancel = false;
-
-	if (req->file->f_op->may_pollfree) {
-		spin_lock_irq(&ctx->completion_lock);
-		return -EOPNOTSUPP;
-	}
-
-	INIT_HLIST_NODE(&req->hash_node);
-	io_init_poll_iocb(poll, mask, wake_func);
-	poll->file = req->file;
-	poll->wait.private = req;
-
-	ipt->pt._key = mask;
-	ipt->req = req;
-	ipt->error = 0;
-	ipt->nr_entries = 0;
-
-	mask = vfs_poll(req->file, &ipt->pt) & poll->events;
-	if (unlikely(!ipt->nr_entries) && !ipt->error)
-		ipt->error = -EINVAL;
-
-	spin_lock_irq(&ctx->completion_lock);
-	if (ipt->error)
-		io_poll_remove_double(req);
-	if (likely(poll->head)) {
-		spin_lock(&poll->head->lock);
-		if (unlikely(list_empty(&poll->wait.entry))) {
-			if (ipt->error)
-				cancel = true;
-			ipt->error = 0;
-			mask = 0;
-		}
-		if (mask || ipt->error)
-			list_del_init(&poll->wait.entry);
-		else if (cancel)
-			WRITE_ONCE(poll->canceled, true);
-		else if (!poll->done) /* actually waiting for an event */
-			io_poll_req_insert(req);
-		spin_unlock(&poll->head->lock);
-	}
-
-	return mask;
-}
-
-static bool io_arm_poll_handler(struct io_kiocb *req)
-{
-	const struct io_op_def *def = &io_op_defs[req->opcode];
-	struct io_ring_ctx *ctx = req->ctx;
-	struct async_poll *apoll;
-	struct io_poll_table ipt;
-	__poll_t mask, ret;
-	int rw;
-
-	if (!req->file || !file_can_poll(req->file))
-		return false;
-	if (req->flags & REQ_F_POLLED)
-		return false;
-	if (def->pollin)
-		rw = READ;
-	else if (def->pollout)
-		rw = WRITE;
-	else
-		return false;
-	/* if we can't nonblock try, then no point in arming a poll handler */
-	if (!io_file_supports_async(req->file, rw))
-		return false;
-
-	apoll = kmalloc(sizeof(*apoll), GFP_ATOMIC);
-	if (unlikely(!apoll))
-		return false;
-	apoll->double_poll = NULL;
-
-	req->flags |= REQ_F_POLLED;
-	req->apoll = apoll;
-
-	mask = 0;
-	if (def->pollin)
-		mask |= POLLIN | POLLRDNORM;
-	if (def->pollout)
-		mask |= POLLOUT | POLLWRNORM;
-
-	/* If reading from MSG_ERRQUEUE using recvmsg, ignore POLLIN */
-	if ((req->opcode == IORING_OP_RECVMSG) &&
-	    (req->sr_msg.msg_flags & MSG_ERRQUEUE))
-		mask &= ~POLLIN;
-
-	mask |= POLLERR | POLLPRI;
-
-	ipt.pt._qproc = io_async_queue_proc;
-
-	ret = __io_arm_poll_handler(req, &apoll->poll, &ipt, mask,
-					io_async_wake);
-	if (ret || ipt.error) {
-		io_poll_remove_double(req);
-		spin_unlock_irq(&ctx->completion_lock);
-		kfree(apoll->double_poll);
-		kfree(apoll);
-		return false;
-	}
-	spin_unlock_irq(&ctx->completion_lock);
-	trace_io_uring_poll_arm(ctx, req->opcode, req->user_data, mask,
-					apoll->poll.events);
-	return true;
-}
-
-static bool __io_poll_remove_one(struct io_kiocb *req,
-				 struct io_poll_iocb *poll)
-{
-	bool do_complete = false;
-
-	spin_lock(&poll->head->lock);
-	WRITE_ONCE(poll->canceled, true);
-	if (!list_empty(&poll->wait.entry)) {
-		list_del_init(&poll->wait.entry);
-		do_complete = true;
-	}
-	spin_unlock(&poll->head->lock);
-	hash_del(&req->hash_node);
-	return do_complete;
-}
-
-static bool io_poll_remove_one(struct io_kiocb *req)
-{
-	bool do_complete;
-
-	io_poll_remove_double(req);
-
-	if (req->opcode == IORING_OP_POLL_ADD) {
-		do_complete = __io_poll_remove_one(req, &req->poll);
-	} else {
-		struct async_poll *apoll = req->apoll;
-
-		/* non-poll requests have submit ref still */
-		do_complete = __io_poll_remove_one(req, &apoll->poll);
-		if (do_complete) {
-			io_put_req(req);
-			kfree(apoll->double_poll);
-			kfree(apoll);
-		}
-	}
-
-	if (do_complete) {
-		io_cqring_fill_event(req, -ECANCELED);
-		io_commit_cqring(req->ctx);
-		req_set_fail_links(req);
-		io_put_req_deferred(req, 1);
-	}
-
-	return do_complete;
-}
-
-/*
- * Returns true if we found and killed one or more poll requests
- */
-static bool io_poll_remove_all(struct io_ring_ctx *ctx, struct task_struct *tsk,
-			       struct files_struct *files)
-{
-	struct hlist_node *tmp;
-	struct io_kiocb *req;
-	int posted = 0, i;
-
-	spin_lock_irq(&ctx->completion_lock);
-	for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) {
-		struct hlist_head *list;
-
-		list = &ctx->cancel_hash[i];
-		hlist_for_each_entry_safe(req, tmp, list, hash_node) {
-			if (io_match_task(req, tsk, files))
-				posted += io_poll_remove_one(req);
-		}
-	}
-	spin_unlock_irq(&ctx->completion_lock);
-
-	if (posted)
-		io_cqring_ev_posted(ctx);
-
-	return posted != 0;
-}
-
-static int io_poll_cancel(struct io_ring_ctx *ctx, __u64 sqe_addr)
-{
-	struct hlist_head *list;
-	struct io_kiocb *req;
-
-	list = &ctx->cancel_hash[hash_long(sqe_addr, ctx->cancel_hash_bits)];
-	hlist_for_each_entry(req, list, hash_node) {
-		if (sqe_addr != req->user_data)
-			continue;
-		if (io_poll_remove_one(req))
-			return 0;
-		return -EALREADY;
-	}
-
-	return -ENOENT;
-}
-
-static int io_poll_remove_prep(struct io_kiocb *req,
-			       const struct io_uring_sqe *sqe)
-{
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-	if (sqe->ioprio || sqe->off || sqe->len || sqe->buf_index ||
-	    sqe->poll_events)
-		return -EINVAL;
-
-	req->poll.addr = READ_ONCE(sqe->addr);
-	return 0;
-}
-
-/*
- * Find a running poll command that matches one specified in sqe->addr,
- * and remove it if found.
- */
-static int io_poll_remove(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	u64 addr;
-	int ret;
-
-	addr = req->poll.addr;
-	spin_lock_irq(&ctx->completion_lock);
-	ret = io_poll_cancel(ctx, addr);
-	spin_unlock_irq(&ctx->completion_lock);
-
-	if (ret < 0)
-		req_set_fail_links(req);
-	io_req_complete(req, ret);
-	return 0;
-}
-
-static int io_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync,
-			void *key)
-{
-	struct io_kiocb *req = wait->private;
-	struct io_poll_iocb *poll = &req->poll;
-
-	return __io_async_wake(req, poll, key_to_poll(key), io_poll_task_func);
-}
-
-static void io_poll_queue_proc(struct file *file, struct wait_queue_head *head,
-			       struct poll_table_struct *p)
-{
-	struct io_poll_table *pt = container_of(p, struct io_poll_table, pt);
-
-	__io_queue_proc(&pt->req->poll, pt, head, (struct io_poll_iocb **) &pt->req->async_data);
-}
-
-static int io_poll_add_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	struct io_poll_iocb *poll = &req->poll;
-	u32 events;
-
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-	if (sqe->addr || sqe->ioprio || sqe->off || sqe->len || sqe->buf_index)
-		return -EINVAL;
-
-	events = READ_ONCE(sqe->poll32_events);
-#ifdef __BIG_ENDIAN
-	events = swahw32(events);
-#endif
-	poll->events = demangle_poll(events) | EPOLLERR | EPOLLHUP |
-		       (events & EPOLLEXCLUSIVE);
-	return 0;
-}
-
-static int io_poll_add(struct io_kiocb *req)
-{
-	struct io_poll_iocb *poll = &req->poll;
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_poll_table ipt;
-	__poll_t mask;
-
-	ipt.pt._qproc = io_poll_queue_proc;
-
-	mask = __io_arm_poll_handler(req, &req->poll, &ipt, poll->events,
-					io_poll_wake);
-
-	if (mask) { /* no async, we'd stolen it */
-		ipt.error = 0;
-		io_poll_complete(req, mask, 0);
-	}
-	spin_unlock_irq(&ctx->completion_lock);
-
-	if (mask) {
-		io_cqring_ev_posted(ctx);
-		io_put_req(req);
-	}
-	return ipt.error;
-}
-
-static enum hrtimer_restart io_timeout_fn(struct hrtimer *timer)
-{
-	struct io_timeout_data *data = container_of(timer,
-						struct io_timeout_data, timer);
-	struct io_kiocb *req = data->req;
-	struct io_ring_ctx *ctx = req->ctx;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ctx->completion_lock, flags);
-	list_del_init(&req->timeout.list);
-	atomic_set(&req->ctx->cq_timeouts,
-		atomic_read(&req->ctx->cq_timeouts) + 1);
-
-	io_cqring_fill_event(req, -ETIME);
-	io_commit_cqring(ctx);
-	spin_unlock_irqrestore(&ctx->completion_lock, flags);
-
-	io_cqring_ev_posted(ctx);
-	req_set_fail_links(req);
-	io_put_req(req);
-	return HRTIMER_NORESTART;
-}
-
-static int __io_timeout_cancel(struct io_kiocb *req)
-{
-	struct io_timeout_data *io = req->async_data;
-	int ret;
-
-	ret = hrtimer_try_to_cancel(&io->timer);
-	if (ret == -1)
-		return -EALREADY;
-	list_del_init(&req->timeout.list);
-
-	req_set_fail_links(req);
-	io_cqring_fill_event(req, -ECANCELED);
-	io_put_req_deferred(req, 1);
-	return 0;
-}
-
-static int io_timeout_cancel(struct io_ring_ctx *ctx, __u64 user_data)
-{
-	struct io_kiocb *req;
-	int ret = -ENOENT;
-
-	list_for_each_entry(req, &ctx->timeout_list, timeout.list) {
-		if (user_data == req->user_data) {
-			ret = 0;
-			break;
-		}
-	}
-
-	if (ret == -ENOENT)
-		return ret;
-
-	return __io_timeout_cancel(req);
-}
-
-static int io_timeout_remove_prep(struct io_kiocb *req,
-				  const struct io_uring_sqe *sqe)
-{
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-	if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT)))
-		return -EINVAL;
-	if (sqe->ioprio || sqe->buf_index || sqe->len || sqe->timeout_flags ||
-	    sqe->splice_fd_in)
-		return -EINVAL;
-
-	req->timeout_rem.addr = READ_ONCE(sqe->addr);
-	return 0;
-}
-
-/*
- * Remove or update an existing timeout command
- */
-static int io_timeout_remove(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	int ret;
-
-	spin_lock_irq(&ctx->completion_lock);
-	ret = io_timeout_cancel(ctx, req->timeout_rem.addr);
-
-	io_cqring_fill_event(req, ret);
-	io_commit_cqring(ctx);
-	spin_unlock_irq(&ctx->completion_lock);
-	io_cqring_ev_posted(ctx);
-	if (ret < 0)
-		req_set_fail_links(req);
-	io_put_req(req);
-	return 0;
-}
-
-static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe,
-			   bool is_timeout_link)
-{
-	struct io_timeout_data *data;
-	unsigned flags;
-	u32 off = READ_ONCE(sqe->off);
-
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-	if (sqe->ioprio || sqe->buf_index || sqe->len != 1 ||
-	    sqe->splice_fd_in)
-		return -EINVAL;
-	if (off && is_timeout_link)
-		return -EINVAL;
-	flags = READ_ONCE(sqe->timeout_flags);
-	if (flags & ~IORING_TIMEOUT_ABS)
-		return -EINVAL;
-
-	req->timeout.off = off;
-
-	if (!req->async_data && io_alloc_async_data(req))
-		return -ENOMEM;
-
-	data = req->async_data;
-	data->req = req;
-
-	if (get_timespec64(&data->ts, u64_to_user_ptr(sqe->addr)))
-		return -EFAULT;
-
-	if (flags & IORING_TIMEOUT_ABS)
-		data->mode = HRTIMER_MODE_ABS;
-	else
-		data->mode = HRTIMER_MODE_REL;
-
-	INIT_LIST_HEAD(&req->timeout.list);
-	hrtimer_init(&data->timer, CLOCK_MONOTONIC, data->mode);
-	return 0;
-}
-
-static int io_timeout(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_timeout_data *data = req->async_data;
-	struct list_head *entry;
-	u32 tail, off = req->timeout.off;
-
-	spin_lock_irq(&ctx->completion_lock);
-
-	/*
-	 * sqe->off holds how many events that need to occur for this
-	 * timeout event to be satisfied. If it isn't set, then this is
-	 * a pure timeout request, sequence isn't used.
-	 */
-	if (io_is_timeout_noseq(req)) {
-		entry = ctx->timeout_list.prev;
-		goto add;
-	}
-
-	tail = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
-	req->timeout.target_seq = tail + off;
-
-	/* Update the last seq here in case io_flush_timeouts() hasn't.
-	 * This is safe because ->completion_lock is held, and submissions
-	 * and completions are never mixed in the same ->completion_lock section.
-	 */
-	ctx->cq_last_tm_flush = tail;
-
-	/*
-	 * Insertion sort, ensuring the first entry in the list is always
-	 * the one we need first.
-	 */
-	list_for_each_prev(entry, &ctx->timeout_list) {
-		struct io_kiocb *nxt = list_entry(entry, struct io_kiocb,
-						  timeout.list);
-
-		if (io_is_timeout_noseq(nxt))
-			continue;
-		/* nxt.seq is behind @tail, otherwise would've been completed */
-		if (off >= nxt->timeout.target_seq - tail)
-			break;
-	}
-add:
-	list_add(&req->timeout.list, entry);
-	data->timer.function = io_timeout_fn;
-	hrtimer_start(&data->timer, timespec64_to_ktime(data->ts), data->mode);
-	spin_unlock_irq(&ctx->completion_lock);
-	return 0;
-}
-
-static bool io_cancel_cb(struct io_wq_work *work, void *data)
-{
-	struct io_kiocb *req = container_of(work, struct io_kiocb, work);
-
-	return req->user_data == (unsigned long) data;
-}
-
-static int io_async_cancel_one(struct io_ring_ctx *ctx, void *sqe_addr)
-{
-	enum io_wq_cancel cancel_ret;
-	int ret = 0;
-
-	cancel_ret = io_wq_cancel_cb(ctx->io_wq, io_cancel_cb, sqe_addr, false);
-	switch (cancel_ret) {
-	case IO_WQ_CANCEL_OK:
-		ret = 0;
-		break;
-	case IO_WQ_CANCEL_RUNNING:
-		ret = -EALREADY;
-		break;
-	case IO_WQ_CANCEL_NOTFOUND:
-		ret = -ENOENT;
-		break;
-	}
-
-	return ret;
-}
-
-static void io_async_find_and_cancel(struct io_ring_ctx *ctx,
-				     struct io_kiocb *req, __u64 sqe_addr,
-				     int success_ret)
-{
-	unsigned long flags;
-	int ret;
-
-	ret = io_async_cancel_one(ctx, (void *) (unsigned long) sqe_addr);
-	if (ret != -ENOENT) {
-		spin_lock_irqsave(&ctx->completion_lock, flags);
-		goto done;
-	}
-
-	spin_lock_irqsave(&ctx->completion_lock, flags);
-	ret = io_timeout_cancel(ctx, sqe_addr);
-	if (ret != -ENOENT)
-		goto done;
-	ret = io_poll_cancel(ctx, sqe_addr);
-done:
-	if (!ret)
-		ret = success_ret;
-	io_cqring_fill_event(req, ret);
-	io_commit_cqring(ctx);
-	spin_unlock_irqrestore(&ctx->completion_lock, flags);
-	io_cqring_ev_posted(ctx);
-
-	if (ret < 0)
-		req_set_fail_links(req);
-	io_put_req(req);
-}
-
-static int io_async_cancel_prep(struct io_kiocb *req,
-				const struct io_uring_sqe *sqe)
-{
-	if (unlikely(req->ctx->flags & IORING_SETUP_IOPOLL))
-		return -EINVAL;
-	if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT)))
-		return -EINVAL;
-	if (sqe->ioprio || sqe->off || sqe->len || sqe->cancel_flags ||
-	    sqe->splice_fd_in)
-		return -EINVAL;
-
-	req->cancel.addr = READ_ONCE(sqe->addr);
-	return 0;
-}
-
-static int io_async_cancel(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-
-	io_async_find_and_cancel(ctx, req, req->cancel.addr, 0);
-	return 0;
-}
-
-static int io_files_update_prep(struct io_kiocb *req,
-				const struct io_uring_sqe *sqe)
-{
-	if (unlikely(req->ctx->flags & IORING_SETUP_SQPOLL))
-		return -EINVAL;
-	if (unlikely(req->flags & (REQ_F_FIXED_FILE | REQ_F_BUFFER_SELECT)))
-		return -EINVAL;
-	if (sqe->ioprio || sqe->rw_flags)
-		return -EINVAL;
-
-	req->files_update.offset = READ_ONCE(sqe->off);
-	req->files_update.nr_args = READ_ONCE(sqe->len);
-	if (!req->files_update.nr_args)
-		return -EINVAL;
-	req->files_update.arg = READ_ONCE(sqe->addr);
-	return 0;
-}
-
-static int io_files_update(struct io_kiocb *req, bool force_nonblock,
-			   struct io_comp_state *cs)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_uring_files_update up;
-	int ret;
-
-	if (force_nonblock)
-		return -EAGAIN;
-
-	up.offset = req->files_update.offset;
-	up.fds = req->files_update.arg;
-
-	mutex_lock(&ctx->uring_lock);
-	ret = __io_sqe_files_update(ctx, &up, req->files_update.nr_args);
-	mutex_unlock(&ctx->uring_lock);
-
-	if (ret < 0)
-		req_set_fail_links(req);
-	__io_req_complete(req, ret, 0, cs);
-	return 0;
-}
-
-static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	switch (req->opcode) {
-	case IORING_OP_NOP:
-		return 0;
-	case IORING_OP_READV:
-	case IORING_OP_READ_FIXED:
-	case IORING_OP_READ:
-		return io_read_prep(req, sqe);
-	case IORING_OP_WRITEV:
-	case IORING_OP_WRITE_FIXED:
-	case IORING_OP_WRITE:
-		return io_write_prep(req, sqe);
-	case IORING_OP_POLL_ADD:
-		return io_poll_add_prep(req, sqe);
-	case IORING_OP_POLL_REMOVE:
-		return io_poll_remove_prep(req, sqe);
-	case IORING_OP_FSYNC:
-		return io_prep_fsync(req, sqe);
-	case IORING_OP_SYNC_FILE_RANGE:
-		return io_prep_sfr(req, sqe);
-	case IORING_OP_SENDMSG:
-	case IORING_OP_SEND:
-		return io_sendmsg_prep(req, sqe);
-	case IORING_OP_RECVMSG:
-	case IORING_OP_RECV:
-		return io_recvmsg_prep(req, sqe);
-	case IORING_OP_CONNECT:
-		return io_connect_prep(req, sqe);
-	case IORING_OP_TIMEOUT:
-		return io_timeout_prep(req, sqe, false);
-	case IORING_OP_TIMEOUT_REMOVE:
-		return io_timeout_remove_prep(req, sqe);
-	case IORING_OP_ASYNC_CANCEL:
-		return io_async_cancel_prep(req, sqe);
-	case IORING_OP_LINK_TIMEOUT:
-		return io_timeout_prep(req, sqe, true);
-	case IORING_OP_ACCEPT:
-		return io_accept_prep(req, sqe);
-	case IORING_OP_FALLOCATE:
-		return io_fallocate_prep(req, sqe);
-	case IORING_OP_OPENAT:
-		return io_openat_prep(req, sqe);
-	case IORING_OP_CLOSE:
-		return io_close_prep(req, sqe);
-	case IORING_OP_FILES_UPDATE:
-		return io_files_update_prep(req, sqe);
-	case IORING_OP_STATX:
-		return io_statx_prep(req, sqe);
-	case IORING_OP_FADVISE:
-		return io_fadvise_prep(req, sqe);
-	case IORING_OP_MADVISE:
-		return io_madvise_prep(req, sqe);
-	case IORING_OP_OPENAT2:
-		return io_openat2_prep(req, sqe);
-	case IORING_OP_EPOLL_CTL:
-		return io_epoll_ctl_prep(req, sqe);
-	case IORING_OP_SPLICE:
-		return io_splice_prep(req, sqe);
-	case IORING_OP_PROVIDE_BUFFERS:
-		return io_provide_buffers_prep(req, sqe);
-	case IORING_OP_REMOVE_BUFFERS:
-		return io_remove_buffers_prep(req, sqe);
-	case IORING_OP_TEE:
-		return io_tee_prep(req, sqe);
-	}
-
-	printk_once(KERN_WARNING "io_uring: unhandled opcode %d\n",
-			req->opcode);
-	return-EINVAL;
-}
-
-static int io_req_defer_prep(struct io_kiocb *req,
-			     const struct io_uring_sqe *sqe)
-{
-	if (!sqe)
-		return 0;
-	if (io_alloc_async_data(req))
-		return -EAGAIN;
-	return io_req_prep(req, sqe);
-}
-
-static u32 io_get_sequence(struct io_kiocb *req)
-{
-	struct io_kiocb *pos;
-	struct io_ring_ctx *ctx = req->ctx;
-	u32 total_submitted, nr_reqs = 1;
-
-	if (req->flags & REQ_F_LINK_HEAD)
-		list_for_each_entry(pos, &req->link_list, link_list)
-			nr_reqs++;
-
-	total_submitted = ctx->cached_sq_head - ctx->cached_sq_dropped;
-	return total_submitted - nr_reqs;
-}
-
-static int io_req_defer(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_defer_entry *de;
-	int ret;
-	u32 seq;
-
-	/* Still need defer if there is pending req in defer list. */
-	if (likely(list_empty_careful(&ctx->defer_list) &&
-		!(req->flags & REQ_F_IO_DRAIN)))
-		return 0;
-
-	seq = io_get_sequence(req);
-	/* Still a chance to pass the sequence check */
-	if (!req_need_defer(req, seq) && list_empty_careful(&ctx->defer_list))
-		return 0;
-
-	if (!req->async_data) {
-		ret = io_req_defer_prep(req, sqe);
-		if (ret)
-			return ret;
-	}
-	io_prep_async_link(req);
-	de = kmalloc(sizeof(*de), GFP_KERNEL);
-	if (!de)
-		return -ENOMEM;
-
-	spin_lock_irq(&ctx->completion_lock);
-	if (!req_need_defer(req, seq) && list_empty(&ctx->defer_list)) {
-		spin_unlock_irq(&ctx->completion_lock);
-		kfree(de);
-		io_queue_async_work(req);
-		return -EIOCBQUEUED;
-	}
-
-	trace_io_uring_defer(ctx, req, req->user_data);
-	de->req = req;
-	de->seq = seq;
-	list_add_tail(&de->list, &ctx->defer_list);
-	spin_unlock_irq(&ctx->completion_lock);
-	return -EIOCBQUEUED;
-}
-
-static void io_req_drop_files(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_uring_task *tctx = req->task->io_uring;
-	unsigned long flags;
-
-	if (req->work.flags & IO_WQ_WORK_FILES) {
-		put_files_struct(req->work.identity->files);
-		put_nsproxy(req->work.identity->nsproxy);
-	}
-	spin_lock_irqsave(&ctx->inflight_lock, flags);
-	list_del(&req->inflight_entry);
-	spin_unlock_irqrestore(&ctx->inflight_lock, flags);
-	req->flags &= ~REQ_F_INFLIGHT;
-	req->work.flags &= ~IO_WQ_WORK_FILES;
-	if (atomic_read(&tctx->in_idle))
-		wake_up(&tctx->wait);
-}
-
-static void __io_clean_op(struct io_kiocb *req)
-{
-	if (req->flags & REQ_F_BUFFER_SELECTED) {
-		switch (req->opcode) {
-		case IORING_OP_READV:
-		case IORING_OP_READ_FIXED:
-		case IORING_OP_READ:
-			kfree((void *)(unsigned long)req->rw.addr);
-			break;
-		case IORING_OP_RECVMSG:
-		case IORING_OP_RECV:
-			kfree(req->sr_msg.kbuf);
-			break;
-		}
-		req->flags &= ~REQ_F_BUFFER_SELECTED;
-	}
-
-	if (req->flags & REQ_F_NEED_CLEANUP) {
-		switch (req->opcode) {
-		case IORING_OP_READV:
-		case IORING_OP_READ_FIXED:
-		case IORING_OP_READ:
-		case IORING_OP_WRITEV:
-		case IORING_OP_WRITE_FIXED:
-		case IORING_OP_WRITE: {
-			struct io_async_rw *io = req->async_data;
-			if (io->free_iovec)
-				kfree(io->free_iovec);
-			break;
-			}
-		case IORING_OP_RECVMSG:
-		case IORING_OP_SENDMSG: {
-			struct io_async_msghdr *io = req->async_data;
-			if (io->iov != io->fast_iov)
-				kfree(io->iov);
-			break;
-			}
-		case IORING_OP_SPLICE:
-		case IORING_OP_TEE:
-			io_put_file(req, req->splice.file_in,
-				    (req->splice.flags & SPLICE_F_FD_IN_FIXED));
-			break;
-		case IORING_OP_OPENAT:
-		case IORING_OP_OPENAT2:
-			if (req->open.filename)
-				putname(req->open.filename);
-			break;
-		}
-		req->flags &= ~REQ_F_NEED_CLEANUP;
-	}
-}
-
-static int io_issue_sqe(struct io_kiocb *req, bool force_nonblock,
-			struct io_comp_state *cs)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	int ret;
-
-	switch (req->opcode) {
-	case IORING_OP_NOP:
-		ret = io_nop(req, cs);
-		break;
-	case IORING_OP_READV:
-	case IORING_OP_READ_FIXED:
-	case IORING_OP_READ:
-		ret = io_read(req, force_nonblock, cs);
-		break;
-	case IORING_OP_WRITEV:
-	case IORING_OP_WRITE_FIXED:
-	case IORING_OP_WRITE:
-		ret = io_write(req, force_nonblock, cs);
-		break;
-	case IORING_OP_FSYNC:
-		ret = io_fsync(req, force_nonblock);
-		break;
-	case IORING_OP_POLL_ADD:
-		ret = io_poll_add(req);
-		break;
-	case IORING_OP_POLL_REMOVE:
-		ret = io_poll_remove(req);
-		break;
-	case IORING_OP_SYNC_FILE_RANGE:
-		ret = io_sync_file_range(req, force_nonblock);
-		break;
-	case IORING_OP_SENDMSG:
-		ret = io_sendmsg(req, force_nonblock, cs);
-		break;
-	case IORING_OP_SEND:
-		ret = io_send(req, force_nonblock, cs);
-		break;
-	case IORING_OP_RECVMSG:
-		ret = io_recvmsg(req, force_nonblock, cs);
-		break;
-	case IORING_OP_RECV:
-		ret = io_recv(req, force_nonblock, cs);
-		break;
-	case IORING_OP_TIMEOUT:
-		ret = io_timeout(req);
-		break;
-	case IORING_OP_TIMEOUT_REMOVE:
-		ret = io_timeout_remove(req);
-		break;
-	case IORING_OP_ACCEPT:
-		ret = io_accept(req, force_nonblock, cs);
-		break;
-	case IORING_OP_CONNECT:
-		ret = io_connect(req, force_nonblock, cs);
-		break;
-	case IORING_OP_ASYNC_CANCEL:
-		ret = io_async_cancel(req);
-		break;
-	case IORING_OP_FALLOCATE:
-		ret = io_fallocate(req, force_nonblock);
-		break;
-	case IORING_OP_OPENAT:
-		ret = io_openat(req, force_nonblock);
-		break;
-	case IORING_OP_CLOSE:
-		ret = io_close(req, force_nonblock, cs);
-		break;
-	case IORING_OP_FILES_UPDATE:
-		ret = io_files_update(req, force_nonblock, cs);
-		break;
-	case IORING_OP_STATX:
-		ret = io_statx(req, force_nonblock);
-		break;
-	case IORING_OP_FADVISE:
-		ret = io_fadvise(req, force_nonblock);
-		break;
-	case IORING_OP_MADVISE:
-		ret = io_madvise(req, force_nonblock);
-		break;
-	case IORING_OP_OPENAT2:
-		ret = io_openat2(req, force_nonblock);
-		break;
-	case IORING_OP_EPOLL_CTL:
-		ret = io_epoll_ctl(req, force_nonblock, cs);
-		break;
-	case IORING_OP_SPLICE:
-		ret = io_splice(req, force_nonblock);
-		break;
-	case IORING_OP_PROVIDE_BUFFERS:
-		ret = io_provide_buffers(req, force_nonblock, cs);
-		break;
-	case IORING_OP_REMOVE_BUFFERS:
-		ret = io_remove_buffers(req, force_nonblock, cs);
-		break;
-	case IORING_OP_TEE:
-		ret = io_tee(req, force_nonblock);
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-	if (ret)
-		return ret;
-
-	/* If the op doesn't have a file, we're not polling for it */
-	if ((ctx->flags & IORING_SETUP_IOPOLL) && req->file) {
-		const bool in_async = io_wq_current_is_worker();
-
-		/* workqueue context doesn't hold uring_lock, grab it now */
-		if (in_async)
-			mutex_lock(&ctx->uring_lock);
-
-		io_iopoll_req_issued(req);
-
-		if (in_async)
-			mutex_unlock(&ctx->uring_lock);
-	}
-
-	return 0;
-}
-
-static struct io_wq_work *io_wq_submit_work(struct io_wq_work *work)
-{
-	struct io_kiocb *req = container_of(work, struct io_kiocb, work);
-	struct io_kiocb *timeout;
-	int ret = 0;
-
-	timeout = io_prep_linked_timeout(req);
-	if (timeout)
-		io_queue_linked_timeout(timeout);
-
-	/* if NO_CANCEL is set, we must still run the work */
-	if ((work->flags & (IO_WQ_WORK_CANCEL|IO_WQ_WORK_NO_CANCEL)) ==
-				IO_WQ_WORK_CANCEL) {
-		ret = -ECANCELED;
-	}
-
-	if (!ret) {
-		do {
-			ret = io_issue_sqe(req, false, NULL);
-			/*
-			 * We can get EAGAIN for polled IO even though we're
-			 * forcing a sync submission from here, since we can't
-			 * wait for request slots on the block side.
-			 */
-			if (ret != -EAGAIN)
-				break;
-			cond_resched();
-		} while (1);
-	}
-
-	if (ret) {
-		struct io_ring_ctx *lock_ctx = NULL;
-
-		if (req->ctx->flags & IORING_SETUP_IOPOLL)
-			lock_ctx = req->ctx;
-
-		/*
-		 * io_iopoll_complete() does not hold completion_lock to
-		 * complete polled io, so here for polled io, we can not call
-		 * io_req_complete() directly, otherwise there maybe concurrent
-		 * access to cqring, defer_list, etc, which is not safe. Given
-		 * that io_iopoll_complete() is always called under uring_lock,
-		 * so here for polled io, we also get uring_lock to complete
-		 * it.
-		 */
-		if (lock_ctx)
-			mutex_lock(&lock_ctx->uring_lock);
-
-		req_set_fail_links(req);
-		io_req_complete(req, ret);
-
-		if (lock_ctx)
-			mutex_unlock(&lock_ctx->uring_lock);
-	}
-
-	return io_steal_work(req);
-}
-
-static inline struct file *io_file_from_index(struct io_ring_ctx *ctx,
-					      int index)
-{
-	struct fixed_file_table *table;
-
-	table = &ctx->file_data->table[index >> IORING_FILE_TABLE_SHIFT];
-	return table->files[index & IORING_FILE_TABLE_MASK];
-}
-
-static struct file *io_file_get(struct io_submit_state *state,
-				struct io_kiocb *req, int fd, bool fixed)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	struct file *file;
-
-	if (fixed) {
-		if (unlikely((unsigned int)fd >= ctx->nr_user_files))
-			return NULL;
-		fd = array_index_nospec(fd, ctx->nr_user_files);
-		file = io_file_from_index(ctx, fd);
-		if (file) {
-			req->fixed_file_refs = &ctx->file_data->node->refs;
-			percpu_ref_get(req->fixed_file_refs);
-		}
-	} else {
-		trace_io_uring_file_get(ctx, fd);
-		file = __io_file_get(state, fd);
-	}
-
-	if (file && file->f_op == &io_uring_fops &&
-	    !(req->flags & REQ_F_INFLIGHT)) {
-		io_req_init_async(req);
-		req->flags |= REQ_F_INFLIGHT;
-
-		spin_lock_irq(&ctx->inflight_lock);
-		list_add(&req->inflight_entry, &ctx->inflight_list);
-		spin_unlock_irq(&ctx->inflight_lock);
-	}
-
-	return file;
-}
-
-static int io_req_set_file(struct io_submit_state *state, struct io_kiocb *req,
-			   int fd)
-{
-	bool fixed;
-
-	fixed = (req->flags & REQ_F_FIXED_FILE) != 0;
-	if (unlikely(!fixed && io_async_submit(req->ctx)))
-		return -EBADF;
-
-	req->file = io_file_get(state, req, fd, fixed);
-	if (req->file || io_op_defs[req->opcode].needs_file_no_error)
-		return 0;
-	return -EBADF;
-}
-
-static enum hrtimer_restart io_link_timeout_fn(struct hrtimer *timer)
-{
-	struct io_timeout_data *data = container_of(timer,
-						struct io_timeout_data, timer);
-	struct io_kiocb *req = data->req;
-	struct io_ring_ctx *ctx = req->ctx;
-	struct io_kiocb *prev = NULL;
-	unsigned long flags;
-
-	spin_lock_irqsave(&ctx->completion_lock, flags);
-
-	/*
-	 * We don't expect the list to be empty, that will only happen if we
-	 * race with the completion of the linked work.
-	 */
-	if (!list_empty(&req->link_list)) {
-		prev = list_entry(req->link_list.prev, struct io_kiocb,
-				  link_list);
-		list_del_init(&req->link_list);
-		if (!refcount_inc_not_zero(&prev->refs))
-			prev = NULL;
-	}
-
-	list_del(&req->timeout.list);
-	spin_unlock_irqrestore(&ctx->completion_lock, flags);
-
-	if (prev) {
-		io_async_find_and_cancel(ctx, req, prev->user_data, -ETIME);
-		io_put_req_deferred(prev, 1);
-	} else {
-		io_cqring_add_event(req, -ETIME, 0);
-		io_put_req_deferred(req, 1);
-	}
-	return HRTIMER_NORESTART;
-}
-
-static void __io_queue_linked_timeout(struct io_kiocb *req)
-{
-	/*
-	 * If the list is now empty, then our linked request finished before
-	 * we got a chance to setup the timer
-	 */
-	if (!list_empty(&req->link_list)) {
-		struct io_timeout_data *data = req->async_data;
-
-		data->timer.function = io_link_timeout_fn;
-		hrtimer_start(&data->timer, timespec64_to_ktime(data->ts),
-				data->mode);
-	}
-}
-
-static void io_queue_linked_timeout(struct io_kiocb *req)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-
-	spin_lock_irq(&ctx->completion_lock);
-	__io_queue_linked_timeout(req);
-	spin_unlock_irq(&ctx->completion_lock);
-
-	/* drop submission reference */
-	io_put_req(req);
-}
-
-static struct io_kiocb *io_prep_linked_timeout(struct io_kiocb *req)
-{
-	struct io_kiocb *nxt;
-
-	if (!(req->flags & REQ_F_LINK_HEAD))
-		return NULL;
-	if (req->flags & REQ_F_LINK_TIMEOUT)
-		return NULL;
-
-	nxt = list_first_entry_or_null(&req->link_list, struct io_kiocb,
-					link_list);
-	if (!nxt || nxt->opcode != IORING_OP_LINK_TIMEOUT)
-		return NULL;
-
-	nxt->flags |= REQ_F_LTIMEOUT_ACTIVE;
-	req->flags |= REQ_F_LINK_TIMEOUT;
-	return nxt;
-}
-
-static void __io_queue_sqe(struct io_kiocb *req, struct io_comp_state *cs)
-{
-	struct io_kiocb *linked_timeout;
-	const struct cred *old_creds = NULL;
-	int ret;
-
-again:
-	linked_timeout = io_prep_linked_timeout(req);
-
-	if ((req->flags & REQ_F_WORK_INITIALIZED) &&
-	    (req->work.flags & IO_WQ_WORK_CREDS) &&
-	    req->work.identity->creds != current_cred()) {
-		if (old_creds)
-			revert_creds(old_creds);
-		if (old_creds == req->work.identity->creds)
-			old_creds = NULL; /* restored original creds */
-		else
-			old_creds = override_creds(req->work.identity->creds);
-	}
-
-	ret = io_issue_sqe(req, true, cs);
-
-	/*
-	 * We async punt it if the file wasn't marked NOWAIT, or if the file
-	 * doesn't support non-blocking read/write attempts
-	 */
-	if (ret == -EAGAIN && !(req->flags & REQ_F_NOWAIT)) {
-		if (!io_arm_poll_handler(req)) {
-			/*
-			 * Queued up for async execution, worker will release
-			 * submit reference when the iocb is actually submitted.
-			 */
-			io_queue_async_work(req);
-		}
-
-		if (linked_timeout)
-			io_queue_linked_timeout(linked_timeout);
-	} else if (likely(!ret)) {
-		/* drop submission reference */
-		req = io_put_req_find_next(req);
-		if (linked_timeout)
-			io_queue_linked_timeout(linked_timeout);
-
-		if (req) {
-			if (!(req->flags & REQ_F_FORCE_ASYNC))
-				goto again;
-			io_queue_async_work(req);
-		}
-	} else {
-		/* un-prep timeout, so it'll be killed as any other linked */
-		req->flags &= ~REQ_F_LINK_TIMEOUT;
-		req_set_fail_links(req);
-		io_put_req(req);
-		io_req_complete(req, ret);
-	}
-
-	if (old_creds)
-		revert_creds(old_creds);
-}
-
-static void io_queue_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
-			 struct io_comp_state *cs)
-{
-	int ret;
-
-	ret = io_req_defer(req, sqe);
-	if (ret) {
-		if (ret != -EIOCBQUEUED) {
-fail_req:
-			req_set_fail_links(req);
-			io_put_req(req);
-			io_req_complete(req, ret);
-		}
-	} else if (req->flags & REQ_F_FORCE_ASYNC) {
-		if (!req->async_data) {
-			ret = io_req_defer_prep(req, sqe);
-			if (unlikely(ret))
-				goto fail_req;
-		}
-		io_queue_async_work(req);
-	} else {
-		if (sqe) {
-			ret = io_req_prep(req, sqe);
-			if (unlikely(ret))
-				goto fail_req;
-		}
-		__io_queue_sqe(req, cs);
-	}
-}
-
-static inline void io_queue_link_head(struct io_kiocb *req,
-				      struct io_comp_state *cs)
-{
-	if (unlikely(req->flags & REQ_F_FAIL_LINK)) {
-		io_put_req(req);
-		io_req_complete(req, -ECANCELED);
-	} else
-		io_queue_sqe(req, NULL, cs);
-}
-
-static int io_submit_sqe(struct io_kiocb *req, const struct io_uring_sqe *sqe,
-			 struct io_kiocb **link, struct io_comp_state *cs)
-{
-	struct io_ring_ctx *ctx = req->ctx;
-	int ret;
-
-	/*
-	 * If we already have a head request, queue this one for async
-	 * submittal once the head completes. If we don't have a head but
-	 * IOSQE_IO_LINK is set in the sqe, start a new head. This one will be
-	 * submitted sync once the chain is complete. If none of those
-	 * conditions are true (normal request), then just queue it.
-	 */
-	if (*link) {
-		struct io_kiocb *head = *link;
-
-		/*
-		 * Taking sequential execution of a link, draining both sides
-		 * of the link also fullfils IOSQE_IO_DRAIN semantics for all
-		 * requests in the link. So, it drains the head and the
-		 * next after the link request. The last one is done via
-		 * drain_next flag to persist the effect across calls.
-		 */
-		if (req->flags & REQ_F_IO_DRAIN) {
-			head->flags |= REQ_F_IO_DRAIN;
-			ctx->drain_next = 1;
-		}
-		ret = io_req_defer_prep(req, sqe);
-		if (unlikely(ret)) {
-			/* fail even hard links since we don't submit */
-			head->flags |= REQ_F_FAIL_LINK;
-			return ret;
-		}
-		trace_io_uring_link(ctx, req, head);
-		list_add_tail(&req->link_list, &head->link_list);
-
-		/* last request of a link, enqueue the link */
-		if (!(req->flags & (REQ_F_LINK | REQ_F_HARDLINK))) {
-			io_queue_link_head(head, cs);
-			*link = NULL;
-		}
-	} else {
-		if (unlikely(ctx->drain_next)) {
-			req->flags |= REQ_F_IO_DRAIN;
-			ctx->drain_next = 0;
-		}
-		if (req->flags & (REQ_F_LINK | REQ_F_HARDLINK)) {
-			req->flags |= REQ_F_LINK_HEAD;
-			INIT_LIST_HEAD(&req->link_list);
-
-			ret = io_req_defer_prep(req, sqe);
-			if (unlikely(ret))
-				req->flags |= REQ_F_FAIL_LINK;
-			*link = req;
-		} else {
-			io_queue_sqe(req, sqe, cs);
-		}
-	}
-
-	return 0;
-}
-
-/*
- * Batched submission is done, ensure local IO is flushed out.
- */
-static void io_submit_state_end(struct io_submit_state *state)
-{
-	if (!list_empty(&state->comp.list))
-		io_submit_flush_completions(&state->comp);
-	blk_finish_plug(&state->plug);
-	io_state_file_put(state);
-	if (state->free_reqs)
-		kmem_cache_free_bulk(req_cachep, state->free_reqs, state->reqs);
-}
-
-/*
- * Start submission side cache.
- */
-static void io_submit_state_start(struct io_submit_state *state,
-				  struct io_ring_ctx *ctx, unsigned int max_ios)
-{
-	blk_start_plug(&state->plug);
-	state->comp.nr = 0;
-	INIT_LIST_HEAD(&state->comp.list);
-	state->comp.ctx = ctx;
-	state->free_reqs = 0;
-	state->file = NULL;
-	state->ios_left = max_ios;
-}
-
-static void io_commit_sqring(struct io_ring_ctx *ctx)
-{
-	struct io_rings *rings = ctx->rings;
-
-	/*
-	 * Ensure any loads from the SQEs are done at this point,
-	 * since once we write the new head, the application could
-	 * write new data to them.
-	 */
-	smp_store_release(&rings->sq.head, ctx->cached_sq_head);
-}
-
-/*
- * Fetch an sqe, if one is available. Note that sqe_ptr will point to memory
- * that is mapped by userspace. This means that care needs to be taken to
- * ensure that reads are stable, as we cannot rely on userspace always
- * being a good citizen. If members of the sqe are validated and then later
- * used, it's important that those reads are done through READ_ONCE() to
- * prevent a re-load down the line.
- */
-static const struct io_uring_sqe *io_get_sqe(struct io_ring_ctx *ctx)
-{
-	u32 *sq_array = ctx->sq_array;
-	unsigned head;
-
-	/*
-	 * The cached sq head (or cq tail) serves two purposes:
-	 *
-	 * 1) allows us to batch the cost of updating the user visible
-	 *    head updates.
-	 * 2) allows the kernel side to track the head on its own, even
-	 *    though the application is the one updating it.
-	 */
-	head = READ_ONCE(sq_array[ctx->cached_sq_head & ctx->sq_mask]);
-	if (likely(head < ctx->sq_entries))
-		return &ctx->sq_sqes[head];
-
-	/* drop invalid entries */
-	ctx->cached_sq_dropped++;
-	WRITE_ONCE(ctx->rings->sq_dropped, ctx->cached_sq_dropped);
-	return NULL;
-}
-
-static inline void io_consume_sqe(struct io_ring_ctx *ctx)
-{
-	ctx->cached_sq_head++;
-}
-
-/*
- * Check SQE restrictions (opcode and flags).
- *
- * Returns 'true' if SQE is allowed, 'false' otherwise.
- */
-static inline bool io_check_restriction(struct io_ring_ctx *ctx,
-					struct io_kiocb *req,
-					unsigned int sqe_flags)
-{
-	if (!ctx->restricted)
-		return true;
-
-	if (!test_bit(req->opcode, ctx->restrictions.sqe_op))
-		return false;
-
-	if ((sqe_flags & ctx->restrictions.sqe_flags_required) !=
-	    ctx->restrictions.sqe_flags_required)
-		return false;
-
-	if (sqe_flags & ~(ctx->restrictions.sqe_flags_allowed |
-			  ctx->restrictions.sqe_flags_required))
-		return false;
-
-	return true;
-}
-
-#define SQE_VALID_FLAGS	(IOSQE_FIXED_FILE|IOSQE_IO_DRAIN|IOSQE_IO_LINK|	\
-				IOSQE_IO_HARDLINK | IOSQE_ASYNC | \
-				IOSQE_BUFFER_SELECT)
-
-static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
-		       const struct io_uring_sqe *sqe,
-		       struct io_submit_state *state)
-{
-	unsigned int sqe_flags;
-	int id, ret;
-
-	req->opcode = READ_ONCE(sqe->opcode);
-	req->user_data = READ_ONCE(sqe->user_data);
-	req->async_data = NULL;
-	req->file = NULL;
-	req->ctx = ctx;
-	req->flags = 0;
-	/* one is dropped after submission, the other at completion */
-	refcount_set(&req->refs, 2);
-	req->task = current;
-	req->result = 0;
-
-	if (unlikely(req->opcode >= IORING_OP_LAST))
-		return -EINVAL;
-
-	if (unlikely(io_sq_thread_acquire_mm(ctx, req)))
-		return -EFAULT;
-
-	sqe_flags = READ_ONCE(sqe->flags);
-	/* enforce forwards compatibility on users */
-	if (unlikely(sqe_flags & ~SQE_VALID_FLAGS))
-		return -EINVAL;
-
-	if (unlikely(!io_check_restriction(ctx, req, sqe_flags)))
-		return -EACCES;
-
-	if ((sqe_flags & IOSQE_BUFFER_SELECT) &&
-	    !io_op_defs[req->opcode].buffer_select)
-		return -EOPNOTSUPP;
-
-	id = READ_ONCE(sqe->personality);
-	if (id) {
-		struct io_identity *iod;
-
-		iod = xa_load(&ctx->personalities, id);
-		if (unlikely(!iod))
-			return -EINVAL;
-		refcount_inc(&iod->count);
-
-		__io_req_init_async(req);
-		get_cred(iod->creds);
-		req->work.identity = iod;
-		req->work.flags |= IO_WQ_WORK_CREDS;
-	}
-
-	/* same numerical values with corresponding REQ_F_*, safe to copy */
-	req->flags |= sqe_flags;
-
-	if (!io_op_defs[req->opcode].needs_file)
-		return 0;
-
-	ret = io_req_set_file(state, req, READ_ONCE(sqe->fd));
-	state->ios_left--;
-	return ret;
-}
-
-static int io_submit_sqes(struct io_ring_ctx *ctx, unsigned int nr)
-{
-	struct io_submit_state state;
-	struct io_kiocb *link = NULL;
-	int i, submitted = 0;
-
-	/* if we have a backlog and couldn't flush it all, return BUSY */
-	if (test_bit(0, &ctx->sq_check_overflow)) {
-		if (!__io_cqring_overflow_flush(ctx, false, NULL, NULL))
-			return -EBUSY;
-	}
-
-	/* make sure SQ entry isn't read before tail */
-	nr = min3(nr, ctx->sq_entries, io_sqring_entries(ctx));
-
-	if (!percpu_ref_tryget_many(&ctx->refs, nr))
-		return -EAGAIN;
-
-	percpu_counter_add(&current->io_uring->inflight, nr);
-	refcount_add(nr, &current->usage);
-
-	io_submit_state_start(&state, ctx, nr);
-
-	for (i = 0; i < nr; i++) {
-		const struct io_uring_sqe *sqe;
-		struct io_kiocb *req;
-		int err;
-
-		sqe = io_get_sqe(ctx);
-		if (unlikely(!sqe)) {
-			io_consume_sqe(ctx);
-			break;
-		}
-		req = io_alloc_req(ctx, &state);
-		if (unlikely(!req)) {
-			if (!submitted)
-				submitted = -EAGAIN;
-			break;
-		}
-		io_consume_sqe(ctx);
-		/* will complete beyond this point, count as submitted */
-		submitted++;
-
-		err = io_init_req(ctx, req, sqe, &state);
-		if (unlikely(err)) {
-fail_req:
-			io_put_req(req);
-			io_req_complete(req, err);
-			break;
-		}
-
-		trace_io_uring_submit_sqe(ctx, req->opcode, req->user_data,
-						true, io_async_submit(ctx));
-		err = io_submit_sqe(req, sqe, &link, &state.comp);
-		if (err)
-			goto fail_req;
-	}
-
-	if (unlikely(submitted != nr)) {
-		int ref_used = (submitted == -EAGAIN) ? 0 : submitted;
-		struct io_uring_task *tctx = current->io_uring;
-		int unused = nr - ref_used;
-
-		percpu_ref_put_many(&ctx->refs, unused);
-		percpu_counter_sub(&tctx->inflight, unused);
-		put_task_struct_many(current, unused);
-	}
-	if (link)
-		io_queue_link_head(link, &state.comp);
-	io_submit_state_end(&state);
-
-	 /* Commit SQ ring head once we've consumed and submitted all SQEs */
-	io_commit_sqring(ctx);
-
-	return submitted;
-}
-
-static inline void io_ring_set_wakeup_flag(struct io_ring_ctx *ctx)
-{
-	/* Tell userspace we may need a wakeup call */
-	spin_lock_irq(&ctx->completion_lock);
-	ctx->rings->sq_flags |= IORING_SQ_NEED_WAKEUP;
-	spin_unlock_irq(&ctx->completion_lock);
-}
-
-static inline void io_ring_clear_wakeup_flag(struct io_ring_ctx *ctx)
-{
-	spin_lock_irq(&ctx->completion_lock);
-	ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP;
-	spin_unlock_irq(&ctx->completion_lock);
-}
-
-static int io_sq_wake_function(struct wait_queue_entry *wqe, unsigned mode,
-			       int sync, void *key)
-{
-	struct io_ring_ctx *ctx = container_of(wqe, struct io_ring_ctx, sqo_wait_entry);
-	int ret;
-
-	ret = autoremove_wake_function(wqe, mode, sync, key);
-	if (ret) {
-		unsigned long flags;
-
-		spin_lock_irqsave(&ctx->completion_lock, flags);
-		ctx->rings->sq_flags &= ~IORING_SQ_NEED_WAKEUP;
-		spin_unlock_irqrestore(&ctx->completion_lock, flags);
-	}
-	return ret;
-}
-
-enum sq_ret {
-	SQT_IDLE	= 1,
-	SQT_SPIN	= 2,
-	SQT_DID_WORK	= 4,
-};
-
-static enum sq_ret __io_sq_thread(struct io_ring_ctx *ctx,
-				  unsigned long start_jiffies, bool cap_entries)
-{
-	unsigned long timeout = start_jiffies + ctx->sq_thread_idle;
-	struct io_sq_data *sqd = ctx->sq_data;
-	unsigned int to_submit;
-	int ret = 0;
-
-again:
-	if (!list_empty(&ctx->iopoll_list)) {
-		unsigned nr_events = 0;
-
-		mutex_lock(&ctx->uring_lock);
-		if (!list_empty(&ctx->iopoll_list) && !need_resched())
-			io_do_iopoll(ctx, &nr_events, 0);
-		mutex_unlock(&ctx->uring_lock);
-	}
-
-	to_submit = io_sqring_entries(ctx);
-
-	/*
-	 * If submit got -EBUSY, flag us as needing the application
-	 * to enter the kernel to reap and flush events.
-	 */
-	if (!to_submit || ret == -EBUSY || need_resched()) {
-		/*
-		 * Drop cur_mm before scheduling, we can't hold it for
-		 * long periods (or over schedule()). Do this before
-		 * adding ourselves to the waitqueue, as the unuse/drop
-		 * may sleep.
-		 */
-		io_sq_thread_drop_mm();
-
-		/*
-		 * We're polling. If we're within the defined idle
-		 * period, then let us spin without work before going
-		 * to sleep. The exception is if we got EBUSY doing
-		 * more IO, we should wait for the application to
-		 * reap events and wake us up.
-		 */
-		if (!list_empty(&ctx->iopoll_list) || need_resched() ||
-		    (!time_after(jiffies, timeout) && ret != -EBUSY &&
-		    !percpu_ref_is_dying(&ctx->refs)))
-			return SQT_SPIN;
-
-		prepare_to_wait(&sqd->wait, &ctx->sqo_wait_entry,
-					TASK_INTERRUPTIBLE);
-
-		/*
-		 * While doing polled IO, before going to sleep, we need
-		 * to check if there are new reqs added to iopoll_list,
-		 * it is because reqs may have been punted to io worker
-		 * and will be added to iopoll_list later, hence check
-		 * the iopoll_list again.
-		 */
-		if ((ctx->flags & IORING_SETUP_IOPOLL) &&
-		    !list_empty_careful(&ctx->iopoll_list)) {
-			finish_wait(&sqd->wait, &ctx->sqo_wait_entry);
-			goto again;
-		}
-
-		to_submit = io_sqring_entries(ctx);
-		if (!to_submit || ret == -EBUSY)
-			return SQT_IDLE;
-	}
-
-	finish_wait(&sqd->wait, &ctx->sqo_wait_entry);
-	io_ring_clear_wakeup_flag(ctx);
-
-	/* if we're handling multiple rings, cap submit size for fairness */
-	if (cap_entries && to_submit > 8)
-		to_submit = 8;
-
-	mutex_lock(&ctx->uring_lock);
-	if (likely(!percpu_ref_is_dying(&ctx->refs) && !ctx->sqo_dead))
-		ret = io_submit_sqes(ctx, to_submit);
-	mutex_unlock(&ctx->uring_lock);
-
-	if (!io_sqring_full(ctx) && wq_has_sleeper(&ctx->sqo_sq_wait))
-		wake_up(&ctx->sqo_sq_wait);
-
-	return SQT_DID_WORK;
-}
-
-static void io_sqd_init_new(struct io_sq_data *sqd)
-{
-	struct io_ring_ctx *ctx;
-
-	while (!list_empty(&sqd->ctx_new_list)) {
-		ctx = list_first_entry(&sqd->ctx_new_list, struct io_ring_ctx, sqd_list);
-		init_wait(&ctx->sqo_wait_entry);
-		ctx->sqo_wait_entry.func = io_sq_wake_function;
-		list_move_tail(&ctx->sqd_list, &sqd->ctx_list);
-		complete(&ctx->sq_thread_comp);
-	}
-}
-
-static int io_sq_thread(void *data)
-{
-	struct cgroup_subsys_state *cur_css = NULL;
-	const struct cred *old_cred = NULL;
-	struct io_sq_data *sqd = data;
-	struct io_ring_ctx *ctx;
-	unsigned long start_jiffies;
-
-	start_jiffies = jiffies;
-	while (!kthread_should_stop()) {
-		enum sq_ret ret = 0;
-		bool cap_entries;
-
-		/*
-		 * Any changes to the sqd lists are synchronized through the
-		 * kthread parking. This synchronizes the thread vs users,
-		 * the users are synchronized on the sqd->ctx_lock.
-		 */
-		if (kthread_should_park()) {
-			kthread_parkme();
-			/*
-			 * When sq thread is unparked, in case the previous park operation
-			 * comes from io_put_sq_data(), which means that sq thread is going
-			 * to be stopped, so here needs to have a check.
-			 */
-			if (kthread_should_stop())
-				break;
-		}
-
-		if (unlikely(!list_empty(&sqd->ctx_new_list)))
-			io_sqd_init_new(sqd);
-
-		cap_entries = !list_is_singular(&sqd->ctx_list);
-
-		list_for_each_entry(ctx, &sqd->ctx_list, sqd_list) {
-			if (current->cred != ctx->creds) {
-				if (old_cred)
-					revert_creds(old_cred);
-				old_cred = override_creds(ctx->creds);
-			}
-			io_sq_thread_associate_blkcg(ctx, &cur_css);
-#ifdef CONFIG_AUDIT
-			current->loginuid = ctx->loginuid;
-			current->sessionid = ctx->sessionid;
-#endif
-
-			ret |= __io_sq_thread(ctx, start_jiffies, cap_entries);
-
-			io_sq_thread_drop_mm();
-		}
-
-		if (ret & SQT_SPIN) {
-			io_run_task_work();
-			io_sq_thread_drop_mm();
-			cond_resched();
-		} else if (ret == SQT_IDLE) {
-			if (kthread_should_park())
-				continue;
-			list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
-				io_ring_set_wakeup_flag(ctx);
-			schedule();
-			start_jiffies = jiffies;
-			list_for_each_entry(ctx, &sqd->ctx_list, sqd_list)
-				io_ring_clear_wakeup_flag(ctx);
-		}
-	}
-
-	io_run_task_work();
-	io_sq_thread_drop_mm();
-
-	if (cur_css)
-		io_sq_thread_unassociate_blkcg();
-	if (old_cred)
-		revert_creds(old_cred);
-
-	kthread_parkme();
-
-	return 0;
-}
-
-struct io_wait_queue {
-	struct wait_queue_entry wq;
-	struct io_ring_ctx *ctx;
-	unsigned to_wait;
-	unsigned nr_timeouts;
-};
-
-static inline bool io_should_wake(struct io_wait_queue *iowq)
-{
-	struct io_ring_ctx *ctx = iowq->ctx;
-
-	/*
-	 * Wake up if we have enough events, or if a timeout occurred since we
-	 * started waiting. For timeouts, we always want to return to userspace,
-	 * regardless of event count.
-	 */
-	return io_cqring_events(ctx) >= iowq->to_wait ||
-			atomic_read(&ctx->cq_timeouts) != iowq->nr_timeouts;
-}
-
-static int io_wake_function(struct wait_queue_entry *curr, unsigned int mode,
-			    int wake_flags, void *key)
-{
-	struct io_wait_queue *iowq = container_of(curr, struct io_wait_queue,
-							wq);
-
-	/*
-	 * Cannot safely flush overflowed CQEs from here, ensure we wake up
-	 * the task, and the next invocation will do it.
-	 */
-	if (io_should_wake(iowq) || test_bit(0, &iowq->ctx->cq_check_overflow))
-		return autoremove_wake_function(curr, mode, wake_flags, key);
-	return -1;
-}
-
-static int io_run_task_work_sig(void)
-{
-	if (io_run_task_work())
-		return 1;
-	if (!signal_pending(current))
-		return 0;
-	if (current->jobctl & JOBCTL_TASK_WORK) {
-		spin_lock_irq(&current->sighand->siglock);
-		current->jobctl &= ~JOBCTL_TASK_WORK;
-		recalc_sigpending();
-		spin_unlock_irq(&current->sighand->siglock);
-		return 1;
-	}
-	return -EINTR;
-}
-
-/*
- * Wait until events become available, if we don't already have some. The
- * application must reap them itself, as they reside on the shared cq ring.
- */
-static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
-			  const sigset_t __user *sig, size_t sigsz)
-{
-	struct io_wait_queue iowq = {
-		.wq = {
-			.private	= current,
-			.func		= io_wake_function,
-			.entry		= LIST_HEAD_INIT(iowq.wq.entry),
-		},
-		.ctx		= ctx,
-		.to_wait	= min_events,
-	};
-	struct io_rings *rings = ctx->rings;
-	int ret = 0;
-
-	do {
-		io_cqring_overflow_flush(ctx, false, NULL, NULL);
-		if (io_cqring_events(ctx) >= min_events)
-			return 0;
-		if (!io_run_task_work())
-			break;
-	} while (1);
-
-	if (sig) {
-#ifdef CONFIG_COMPAT
-		if (in_compat_syscall())
-			ret = set_compat_user_sigmask((const compat_sigset_t __user *)sig,
-						      sigsz);
-		else
-#endif
-			ret = set_user_sigmask(sig, sigsz);
-
-		if (ret)
-			return ret;
-	}
-
-	iowq.nr_timeouts = atomic_read(&ctx->cq_timeouts);
-	trace_io_uring_cqring_wait(ctx, min_events);
-	do {
-		io_cqring_overflow_flush(ctx, false, NULL, NULL);
-		prepare_to_wait_exclusive(&ctx->wait, &iowq.wq,
-						TASK_INTERRUPTIBLE);
-		/* make sure we run task_work before checking for signals */
-		ret = io_run_task_work_sig();
-		if (ret > 0) {
-			finish_wait(&ctx->wait, &iowq.wq);
-			continue;
-		}
-		else if (ret < 0)
-			break;
-		if (io_should_wake(&iowq))
-			break;
-		if (test_bit(0, &ctx->cq_check_overflow)) {
-			finish_wait(&ctx->wait, &iowq.wq);
-			continue;
-		}
-		schedule();
-	} while (1);
-	finish_wait(&ctx->wait, &iowq.wq);
-
-	restore_saved_sigmask_unless(ret == -EINTR);
-
-	return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0;
-}
-
-static void __io_sqe_files_unregister(struct io_ring_ctx *ctx)
-{
-#if defined(CONFIG_UNIX)
-	if (ctx->ring_sock) {
-		struct sock *sock = ctx->ring_sock->sk;
-		struct sk_buff *skb;
-
-		while ((skb = skb_dequeue(&sock->sk_receive_queue)) != NULL)
-			kfree_skb(skb);
-	}
-#else
-	int i;
-
-	for (i = 0; i < ctx->nr_user_files; i++) {
-		struct file *file;
-
-		file = io_file_from_index(ctx, i);
-		if (file)
-			fput(file);
-	}
-#endif
-}
-
-static void io_file_ref_kill(struct percpu_ref *ref)
-{
-	struct fixed_file_data *data;
-
-	data = container_of(ref, struct fixed_file_data, refs);
-	complete(&data->done);
-}
-
-static void io_sqe_files_set_node(struct fixed_file_data *file_data,
-				  struct fixed_file_ref_node *ref_node)
-{
-	spin_lock_bh(&file_data->lock);
-	file_data->node = ref_node;
-	list_add_tail(&ref_node->node, &file_data->ref_list);
-	spin_unlock_bh(&file_data->lock);
-	percpu_ref_get(&file_data->refs);
-}
-
-
-static void io_sqe_files_kill_node(struct fixed_file_data *data)
-{
-	struct fixed_file_ref_node *ref_node = NULL;
-
-	spin_lock_bh(&data->lock);
-	ref_node = data->node;
-	spin_unlock_bh(&data->lock);
-	if (ref_node)
-		percpu_ref_kill(&ref_node->refs);
-}
-
-static int io_file_ref_quiesce(struct fixed_file_data *data,
-			       struct io_ring_ctx *ctx)
-{
-	int ret;
-	struct fixed_file_ref_node *backup_node;
-
-	if (data->quiesce)
-		return -ENXIO;
-
-	data->quiesce = true;
-	do {
-		backup_node = alloc_fixed_file_ref_node(ctx);
-		if (!backup_node)
-			break;
-
-		io_sqe_files_kill_node(data);
-		percpu_ref_kill(&data->refs);
-		flush_delayed_work(&ctx->file_put_work);
-
-		ret = wait_for_completion_interruptible(&data->done);
-		if (!ret)
-			break;
-
-		percpu_ref_resurrect(&data->refs);
-		io_sqe_files_set_node(data, backup_node);
-		backup_node = NULL;
-		reinit_completion(&data->done);
-		mutex_unlock(&ctx->uring_lock);
-		ret = io_run_task_work_sig();
-		mutex_lock(&ctx->uring_lock);
-
-		if (ret < 0)
-			break;
-		backup_node = alloc_fixed_file_ref_node(ctx);
-		ret = -ENOMEM;
-		if (!backup_node)
-			break;
-	} while (1);
-	data->quiesce = false;
-
-	if (backup_node)
-		destroy_fixed_file_ref_node(backup_node);
-	return ret;
-}
-
-static int io_sqe_files_unregister(struct io_ring_ctx *ctx)
-{
-	struct fixed_file_data *data = ctx->file_data;
-	unsigned nr_tables, i;
-	int ret;
-
-	/*
-	 * percpu_ref_is_dying() is to stop parallel files unregister
-	 * Since we possibly drop uring lock later in this function to
-	 * run task work.
-	 */
-	if (!data || percpu_ref_is_dying(&data->refs))
-		return -ENXIO;
-	ret = io_file_ref_quiesce(data, ctx);
-	if (ret)
-		return ret;
-
-	__io_sqe_files_unregister(ctx);
-	nr_tables = DIV_ROUND_UP(ctx->nr_user_files, IORING_MAX_FILES_TABLE);
-	for (i = 0; i < nr_tables; i++)
-		kfree(data->table[i].files);
-	kfree(data->table);
-	percpu_ref_exit(&data->refs);
-	kfree(data);
-	ctx->file_data = NULL;
-	ctx->nr_user_files = 0;
-	return 0;
-}
-
-static void io_put_sq_data(struct io_sq_data *sqd)
-{
-	if (refcount_dec_and_test(&sqd->refs)) {
-		/*
-		 * The park is a bit of a work-around, without it we get
-		 * warning spews on shutdown with SQPOLL set and affinity
-		 * set to a single CPU.
-		 */
-		if (sqd->thread) {
-			kthread_park(sqd->thread);
-			kthread_stop(sqd->thread);
-		}
-
-		kfree(sqd);
-	}
-}
-
-static struct io_sq_data *io_attach_sq_data(struct io_uring_params *p)
-{
-	struct io_ring_ctx *ctx_attach;
-	struct io_sq_data *sqd;
-	struct fd f;
-
-	f = fdget(p->wq_fd);
-	if (!f.file)
-		return ERR_PTR(-ENXIO);
-	if (f.file->f_op != &io_uring_fops) {
-		fdput(f);
-		return ERR_PTR(-EINVAL);
-	}
-
-	ctx_attach = f.file->private_data;
-	sqd = ctx_attach->sq_data;
-	if (!sqd) {
-		fdput(f);
-		return ERR_PTR(-EINVAL);
-	}
-
-	refcount_inc(&sqd->refs);
-	fdput(f);
-	return sqd;
-}
-
-static struct io_sq_data *io_get_sq_data(struct io_uring_params *p)
-{
-	struct io_sq_data *sqd;
-
-	if (p->flags & IORING_SETUP_ATTACH_WQ)
-		return io_attach_sq_data(p);
-
-	sqd = kzalloc(sizeof(*sqd), GFP_KERNEL);
-	if (!sqd)
-		return ERR_PTR(-ENOMEM);
-
-	refcount_set(&sqd->refs, 1);
-	INIT_LIST_HEAD(&sqd->ctx_list);
-	INIT_LIST_HEAD(&sqd->ctx_new_list);
-	mutex_init(&sqd->ctx_lock);
-	mutex_init(&sqd->lock);
-	init_waitqueue_head(&sqd->wait);
-	return sqd;
-}
-
-static void io_sq_thread_unpark(struct io_sq_data *sqd)
-	__releases(&sqd->lock)
-{
-	if (!sqd->thread)
-		return;
-	kthread_unpark(sqd->thread);
-	mutex_unlock(&sqd->lock);
-}
-
-static void io_sq_thread_park(struct io_sq_data *sqd)
-	__acquires(&sqd->lock)
-{
-	if (!sqd->thread)
-		return;
-	mutex_lock(&sqd->lock);
-	kthread_park(sqd->thread);
-}
-
-static void io_sq_thread_stop(struct io_ring_ctx *ctx)
-{
-	struct io_sq_data *sqd = ctx->sq_data;
-
-	if (sqd) {
-		if (sqd->thread) {
-			/*
-			 * We may arrive here from the error branch in
-			 * io_sq_offload_create() where the kthread is created
-			 * without being waked up, thus wake it up now to make
-			 * sure the wait will complete.
-			 */
-			wake_up_process(sqd->thread);
-			wait_for_completion(&ctx->sq_thread_comp);
-
-			io_sq_thread_park(sqd);
-		}
-
-		mutex_lock(&sqd->ctx_lock);
-		list_del(&ctx->sqd_list);
-		mutex_unlock(&sqd->ctx_lock);
-
-		if (sqd->thread) {
-			finish_wait(&sqd->wait, &ctx->sqo_wait_entry);
-			io_sq_thread_unpark(sqd);
-		}
-
-		io_put_sq_data(sqd);
-		ctx->sq_data = NULL;
-	}
-}
-
-static void io_finish_async(struct io_ring_ctx *ctx)
-{
-	io_sq_thread_stop(ctx);
-
-	if (ctx->io_wq) {
-		io_wq_destroy(ctx->io_wq);
-		ctx->io_wq = NULL;
-	}
-}
-
-#if defined(CONFIG_UNIX)
-/*
- * Ensure the UNIX gc is aware of our file set, so we are certain that
- * the io_uring can be safely unregistered on process exit, even if we have
- * loops in the file referencing.
- */
-static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset)
-{
-	struct sock *sk = ctx->ring_sock->sk;
-	struct scm_fp_list *fpl;
-	struct sk_buff *skb;
-	int i, nr_files;
-
-	fpl = kzalloc(sizeof(*fpl), GFP_KERNEL);
-	if (!fpl)
-		return -ENOMEM;
-
-	skb = alloc_skb(0, GFP_KERNEL);
-	if (!skb) {
-		kfree(fpl);
-		return -ENOMEM;
-	}
-
-	skb->sk = sk;
-	skb->scm_io_uring = 1;
-
-	nr_files = 0;
-	fpl->user = get_uid(ctx->user);
-	for (i = 0; i < nr; i++) {
-		struct file *file = io_file_from_index(ctx, i + offset);
-
-		if (!file)
-			continue;
-		fpl->fp[nr_files] = get_file(file);
-		unix_inflight(fpl->user, fpl->fp[nr_files]);
-		nr_files++;
-	}
-
-	if (nr_files) {
-		fpl->max = SCM_MAX_FD;
-		fpl->count = nr_files;
-		UNIXCB(skb).fp = fpl;
-		skb->destructor = unix_destruct_scm;
-		refcount_add(skb->truesize, &sk->sk_wmem_alloc);
-		skb_queue_head(&sk->sk_receive_queue, skb);
-
-		for (i = 0; i < nr; i++) {
-			struct file *file = io_file_from_index(ctx, i + offset);
-
-			if (file)
-				fput(file);
-		}
-	} else {
-		kfree_skb(skb);
-		free_uid(fpl->user);
-		kfree(fpl);
-	}
-
-	return 0;
-}
-
-/*
- * If UNIX sockets are enabled, fd passing can cause a reference cycle which
- * causes regular reference counting to break down. We rely on the UNIX
- * garbage collection to take care of this problem for us.
- */
-static int io_sqe_files_scm(struct io_ring_ctx *ctx)
-{
-	unsigned left, total;
-	int ret = 0;
-
-	total = 0;
-	left = ctx->nr_user_files;
-	while (left) {
-		unsigned this_files = min_t(unsigned, left, SCM_MAX_FD);
-
-		ret = __io_sqe_files_scm(ctx, this_files, total);
-		if (ret)
-			break;
-		left -= this_files;
-		total += this_files;
-	}
-
-	if (!ret)
-		return 0;
-
-	while (total < ctx->nr_user_files) {
-		struct file *file = io_file_from_index(ctx, total);
-
-		if (file)
-			fput(file);
-		total++;
-	}
-
-	return ret;
-}
-#else
-static int io_sqe_files_scm(struct io_ring_ctx *ctx)
-{
-	return 0;
-}
-#endif
-
-static int io_sqe_alloc_file_tables(struct fixed_file_data *file_data,
-				    unsigned nr_tables, unsigned nr_files)
-{
-	int i;
-
-	for (i = 0; i < nr_tables; i++) {
-		struct fixed_file_table *table = &file_data->table[i];
-		unsigned this_files;
-
-		this_files = min(nr_files, IORING_MAX_FILES_TABLE);
-		table->files = kcalloc(this_files, sizeof(struct file *),
-					GFP_KERNEL_ACCOUNT);
-		if (!table->files)
-			break;
-		nr_files -= this_files;
-	}
-
-	if (i == nr_tables)
-		return 0;
-
-	for (i = 0; i < nr_tables; i++) {
-		struct fixed_file_table *table = &file_data->table[i];
-		kfree(table->files);
-	}
-	return 1;
-}
-
-static void io_ring_file_put(struct io_ring_ctx *ctx, struct file *file)
-{
-#if defined(CONFIG_UNIX)
-	struct sock *sock = ctx->ring_sock->sk;
-	struct sk_buff_head list, *head = &sock->sk_receive_queue;
-	struct sk_buff *skb;
-	int i;
-
-	__skb_queue_head_init(&list);
-
-	/*
-	 * Find the skb that holds this file in its SCM_RIGHTS. When found,
-	 * remove this entry and rearrange the file array.
-	 */
-	skb = skb_dequeue(head);
-	while (skb) {
-		struct scm_fp_list *fp;
-
-		fp = UNIXCB(skb).fp;
-		for (i = 0; i < fp->count; i++) {
-			int left;
-
-			if (fp->fp[i] != file)
-				continue;
-
-			unix_notinflight(fp->user, fp->fp[i]);
-			left = fp->count - 1 - i;
-			if (left) {
-				memmove(&fp->fp[i], &fp->fp[i + 1],
-						left * sizeof(struct file *));
-			}
-			fp->count--;
-			if (!fp->count) {
-				kfree_skb(skb);
-				skb = NULL;
-			} else {
-				__skb_queue_tail(&list, skb);
-			}
-			fput(file);
-			file = NULL;
-			break;
-		}
-
-		if (!file)
-			break;
-
-		__skb_queue_tail(&list, skb);
-
-		skb = skb_dequeue(head);
-	}
-
-	if (skb_peek(&list)) {
-		spin_lock_irq(&head->lock);
-		while ((skb = __skb_dequeue(&list)) != NULL)
-			__skb_queue_tail(head, skb);
-		spin_unlock_irq(&head->lock);
-	}
-#else
-	fput(file);
-#endif
-}
-
-struct io_file_put {
-	struct list_head list;
-	struct file *file;
-};
-
-static void __io_file_put_work(struct fixed_file_ref_node *ref_node)
-{
-	struct fixed_file_data *file_data = ref_node->file_data;
-	struct io_ring_ctx *ctx = file_data->ctx;
-	struct io_file_put *pfile, *tmp;
-
-	list_for_each_entry_safe(pfile, tmp, &ref_node->file_list, list) {
-		list_del(&pfile->list);
-		io_ring_file_put(ctx, pfile->file);
-		kfree(pfile);
-	}
-
-	percpu_ref_exit(&ref_node->refs);
-	kfree(ref_node);
-	percpu_ref_put(&file_data->refs);
-}
-
-static void io_file_put_work(struct work_struct *work)
-{
-	struct io_ring_ctx *ctx;
-	struct llist_node *node;
-
-	ctx = container_of(work, struct io_ring_ctx, file_put_work.work);
-	node = llist_del_all(&ctx->file_put_llist);
-
-	while (node) {
-		struct fixed_file_ref_node *ref_node;
-		struct llist_node *next = node->next;
-
-		ref_node = llist_entry(node, struct fixed_file_ref_node, llist);
-		__io_file_put_work(ref_node);
-		node = next;
-	}
-}
-
-static void io_file_data_ref_zero(struct percpu_ref *ref)
-{
-	struct fixed_file_ref_node *ref_node;
-	struct fixed_file_data *data;
-	struct io_ring_ctx *ctx;
-	bool first_add = false;
-	int delay = HZ;
-
-	ref_node = container_of(ref, struct fixed_file_ref_node, refs);
-	data = ref_node->file_data;
-	ctx = data->ctx;
-
-	spin_lock_bh(&data->lock);
-	ref_node->done = true;
-
-	while (!list_empty(&data->ref_list)) {
-		ref_node = list_first_entry(&data->ref_list,
-					struct fixed_file_ref_node, node);
-		/* recycle ref nodes in order */
-		if (!ref_node->done)
-			break;
-		list_del(&ref_node->node);
-		first_add |= llist_add(&ref_node->llist, &ctx->file_put_llist);
-	}
-	spin_unlock_bh(&data->lock);
-
-	if (percpu_ref_is_dying(&data->refs))
-		delay = 0;
-
-	if (!delay)
-		mod_delayed_work(system_wq, &ctx->file_put_work, 0);
-	else if (first_add)
-		queue_delayed_work(system_wq, &ctx->file_put_work, delay);
-}
-
-static struct fixed_file_ref_node *alloc_fixed_file_ref_node(
-			struct io_ring_ctx *ctx)
-{
-	struct fixed_file_ref_node *ref_node;
-
-	ref_node = kzalloc(sizeof(*ref_node), GFP_KERNEL);
-	if (!ref_node)
-		return NULL;
-
-	if (percpu_ref_init(&ref_node->refs, io_file_data_ref_zero,
-			    0, GFP_KERNEL)) {
-		kfree(ref_node);
-		return NULL;
-	}
-	INIT_LIST_HEAD(&ref_node->node);
-	INIT_LIST_HEAD(&ref_node->file_list);
-	ref_node->file_data = ctx->file_data;
-	ref_node->done = false;
-	return ref_node;
-}
-
-static void destroy_fixed_file_ref_node(struct fixed_file_ref_node *ref_node)
-{
-	percpu_ref_exit(&ref_node->refs);
-	kfree(ref_node);
-}
-
-static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
-				 unsigned nr_args)
-{
-	__s32 __user *fds = (__s32 __user *) arg;
-	unsigned nr_tables, i;
-	struct file *file;
-	int fd, ret = -ENOMEM;
-	struct fixed_file_ref_node *ref_node;
-	struct fixed_file_data *file_data;
-
-	if (ctx->file_data)
-		return -EBUSY;
-	if (!nr_args)
-		return -EINVAL;
-	if (nr_args > IORING_MAX_FIXED_FILES)
-		return -EMFILE;
-	if (nr_args > rlimit(RLIMIT_NOFILE))
-		return -EMFILE;
-
-	file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL_ACCOUNT);
-	if (!file_data)
-		return -ENOMEM;
-	file_data->ctx = ctx;
-	init_completion(&file_data->done);
-	INIT_LIST_HEAD(&file_data->ref_list);
-	spin_lock_init(&file_data->lock);
-
-	nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE);
-	file_data->table = kcalloc(nr_tables, sizeof(*file_data->table),
-				   GFP_KERNEL_ACCOUNT);
-	if (!file_data->table)
-		goto out_free;
-
-	if (percpu_ref_init(&file_data->refs, io_file_ref_kill,
-				PERCPU_REF_ALLOW_REINIT, GFP_KERNEL))
-		goto out_free;
-
-	if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args))
-		goto out_ref;
-	ctx->file_data = file_data;
-
-	for (i = 0; i < nr_args; i++, ctx->nr_user_files++) {
-		struct fixed_file_table *table;
-		unsigned index;
-
-		if (copy_from_user(&fd, &fds[i], sizeof(fd))) {
-			ret = -EFAULT;
-			goto out_fput;
-		}
-		/* allow sparse sets */
-		if (fd == -1)
-			continue;
-
-		file = fget(fd);
-		ret = -EBADF;
-		if (!file)
-			goto out_fput;
-
-		/*
-		 * Don't allow io_uring instances to be registered. If UNIX
-		 * isn't enabled, then this causes a reference cycle and this
-		 * instance can never get freed. If UNIX is enabled we'll
-		 * handle it just fine, but there's still no point in allowing
-		 * a ring fd as it doesn't support regular read/write anyway.
-		 */
-		if (file->f_op == &io_uring_fops) {
-			fput(file);
-			goto out_fput;
-		}
-		table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT];
-		index = i & IORING_FILE_TABLE_MASK;
-		table->files[index] = file;
-	}
-
-	ret = io_sqe_files_scm(ctx);
-	if (ret) {
-		io_sqe_files_unregister(ctx);
-		return ret;
-	}
-
-	ref_node = alloc_fixed_file_ref_node(ctx);
-	if (!ref_node) {
-		io_sqe_files_unregister(ctx);
-		return -ENOMEM;
-	}
-
-	io_sqe_files_set_node(file_data, ref_node);
-	return ret;
-out_fput:
-	for (i = 0; i < ctx->nr_user_files; i++) {
-		file = io_file_from_index(ctx, i);
-		if (file)
-			fput(file);
-	}
-	for (i = 0; i < nr_tables; i++)
-		kfree(file_data->table[i].files);
-	ctx->nr_user_files = 0;
-out_ref:
-	percpu_ref_exit(&file_data->refs);
-out_free:
-	kfree(file_data->table);
-	kfree(file_data);
-	ctx->file_data = NULL;
-	return ret;
-}
-
-static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file,
-				int index)
-{
-#if defined(CONFIG_UNIX)
-	struct sock *sock = ctx->ring_sock->sk;
-	struct sk_buff_head *head = &sock->sk_receive_queue;
-	struct sk_buff *skb;
-
-	/*
-	 * See if we can merge this file into an existing skb SCM_RIGHTS
-	 * file set. If there's no room, fall back to allocating a new skb
-	 * and filling it in.
-	 */
-	spin_lock_irq(&head->lock);
-	skb = skb_peek(head);
-	if (skb) {
-		struct scm_fp_list *fpl = UNIXCB(skb).fp;
-
-		if (fpl->count < SCM_MAX_FD) {
-			__skb_unlink(skb, head);
-			spin_unlock_irq(&head->lock);
-			fpl->fp[fpl->count] = get_file(file);
-			unix_inflight(fpl->user, fpl->fp[fpl->count]);
-			fpl->count++;
-			spin_lock_irq(&head->lock);
-			__skb_queue_head(head, skb);
-		} else {
-			skb = NULL;
-		}
-	}
-	spin_unlock_irq(&head->lock);
-
-	if (skb) {
-		fput(file);
-		return 0;
-	}
-
-	return __io_sqe_files_scm(ctx, 1, index);
-#else
-	return 0;
-#endif
-}
-
-static int io_queue_file_removal(struct fixed_file_data *data,
-				 struct file *file)
-{
-	struct io_file_put *pfile;
-	struct fixed_file_ref_node *ref_node = data->node;
-
-	pfile = kzalloc(sizeof(*pfile), GFP_KERNEL);
-	if (!pfile)
-		return -ENOMEM;
-
-	pfile->file = file;
-	list_add(&pfile->list, &ref_node->file_list);
-
-	return 0;
-}
-
-static int __io_sqe_files_update(struct io_ring_ctx *ctx,
-				 struct io_uring_files_update *up,
-				 unsigned nr_args)
-{
-	struct fixed_file_data *data = ctx->file_data;
-	struct fixed_file_ref_node *ref_node;
-	struct file *file;
-	__s32 __user *fds;
-	int fd, i, err;
-	__u32 done;
-	bool needs_switch = false;
-
-	if (check_add_overflow(up->offset, nr_args, &done))
-		return -EOVERFLOW;
-	if (done > ctx->nr_user_files)
-		return -EINVAL;
-
-	ref_node = alloc_fixed_file_ref_node(ctx);
-	if (!ref_node)
-		return -ENOMEM;
-
-	done = 0;
-	fds = u64_to_user_ptr(up->fds);
-	while (nr_args) {
-		struct fixed_file_table *table;
-		unsigned index;
-
-		err = 0;
-		if (copy_from_user(&fd, &fds[done], sizeof(fd))) {
-			err = -EFAULT;
-			break;
-		}
-		i = array_index_nospec(up->offset, ctx->nr_user_files);
-		table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
-		index = i & IORING_FILE_TABLE_MASK;
-		if (table->files[index]) {
-			file = table->files[index];
-			err = io_queue_file_removal(data, file);
-			if (err)
-				break;
-			table->files[index] = NULL;
-			needs_switch = true;
-		}
-		if (fd != -1) {
-			file = fget(fd);
-			if (!file) {
-				err = -EBADF;
-				break;
-			}
-			/*
-			 * Don't allow io_uring instances to be registered. If
-			 * UNIX isn't enabled, then this causes a reference
-			 * cycle and this instance can never get freed. If UNIX
-			 * is enabled we'll handle it just fine, but there's
-			 * still no point in allowing a ring fd as it doesn't
-			 * support regular read/write anyway.
-			 */
-			if (file->f_op == &io_uring_fops) {
-				fput(file);
-				err = -EBADF;
-				break;
-			}
-			table->files[index] = file;
-			err = io_sqe_file_register(ctx, file, i);
-			if (err) {
-				table->files[index] = NULL;
-				fput(file);
-				break;
-			}
-		}
-		nr_args--;
-		done++;
-		up->offset++;
-	}
-
-	if (needs_switch) {
-		percpu_ref_kill(&data->node->refs);
-		io_sqe_files_set_node(data, ref_node);
-	} else
-		destroy_fixed_file_ref_node(ref_node);
-
-	return done ? done : err;
-}
-
-static int io_sqe_files_update(struct io_ring_ctx *ctx, void __user *arg,
-			       unsigned nr_args)
-{
-	struct io_uring_files_update up;
-
-	if (!ctx->file_data)
-		return -ENXIO;
-	if (!nr_args)
-		return -EINVAL;
-	if (copy_from_user(&up, arg, sizeof(up)))
-		return -EFAULT;
-	if (up.resv)
-		return -EINVAL;
-
-	return __io_sqe_files_update(ctx, &up, nr_args);
-}
-
-static void io_free_work(struct io_wq_work *work)
-{
-	struct io_kiocb *req = container_of(work, struct io_kiocb, work);
-
-	/* Consider that io_steal_work() relies on this ref */
-	io_put_req(req);
-}
-
-static int io_init_wq_offload(struct io_ring_ctx *ctx,
-			      struct io_uring_params *p)
-{
-	struct io_wq_data data;
-	struct fd f;
-	struct io_ring_ctx *ctx_attach;
-	unsigned int concurrency;
-	int ret = 0;
-
-	data.user = ctx->user;
-	data.free_work = io_free_work;
-	data.do_work = io_wq_submit_work;
-
-	if (!(p->flags & IORING_SETUP_ATTACH_WQ)) {
-		/* Do QD, or 4 * CPUS, whatever is smallest */
-		concurrency = min(ctx->sq_entries, 4 * num_online_cpus());
-
-		ctx->io_wq = io_wq_create(concurrency, &data);
-		if (IS_ERR(ctx->io_wq)) {
-			ret = PTR_ERR(ctx->io_wq);
-			ctx->io_wq = NULL;
-		}
-		return ret;
-	}
-
-	f = fdget(p->wq_fd);
-	if (!f.file)
-		return -EBADF;
-
-	if (f.file->f_op != &io_uring_fops) {
-		ret = -EINVAL;
-		goto out_fput;
-	}
-
-	ctx_attach = f.file->private_data;
-	/* @io_wq is protected by holding the fd */
-	if (!io_wq_get(ctx_attach->io_wq, &data)) {
-		ret = -EINVAL;
-		goto out_fput;
-	}
-
-	ctx->io_wq = ctx_attach->io_wq;
-out_fput:
-	fdput(f);
-	return ret;
-}
-
-static int io_uring_alloc_task_context(struct task_struct *task)
-{
-	struct io_uring_task *tctx;
-	int ret;
-
-	tctx = kmalloc(sizeof(*tctx), GFP_KERNEL);
-	if (unlikely(!tctx))
-		return -ENOMEM;
-
-	ret = percpu_counter_init(&tctx->inflight, 0, GFP_KERNEL);
-	if (unlikely(ret)) {
-		kfree(tctx);
-		return ret;
-	}
-
-	xa_init(&tctx->xa);
-	init_waitqueue_head(&tctx->wait);
-	tctx->last = NULL;
-	atomic_set(&tctx->in_idle, 0);
-	tctx->sqpoll = false;
-	io_init_identity(&tctx->__identity);
-	tctx->identity = &tctx->__identity;
-	task->io_uring = tctx;
-	return 0;
-}
-
-void __io_uring_free(struct task_struct *tsk)
-{
-	struct io_uring_task *tctx = tsk->io_uring;
-
-	WARN_ON_ONCE(!xa_empty(&tctx->xa));
-	WARN_ON_ONCE(refcount_read(&tctx->identity->count) != 1);
-	if (tctx->identity != &tctx->__identity)
-		kfree(tctx->identity);
-	percpu_counter_destroy(&tctx->inflight);
-	kfree(tctx);
-	tsk->io_uring = NULL;
-}
-
-static int io_sq_offload_create(struct io_ring_ctx *ctx,
-				struct io_uring_params *p)
-{
-	int ret;
-
-	if (ctx->flags & IORING_SETUP_SQPOLL) {
-		struct io_sq_data *sqd;
-
-		ret = -EPERM;
-		if (!capable(CAP_SYS_ADMIN))
-			goto err;
-
-		sqd = io_get_sq_data(p);
-		if (IS_ERR(sqd)) {
-			ret = PTR_ERR(sqd);
-			goto err;
-		}
-
-		ctx->sq_data = sqd;
-		io_sq_thread_park(sqd);
-		mutex_lock(&sqd->ctx_lock);
-		list_add(&ctx->sqd_list, &sqd->ctx_new_list);
-		mutex_unlock(&sqd->ctx_lock);
-		io_sq_thread_unpark(sqd);
-
-		ctx->sq_thread_idle = msecs_to_jiffies(p->sq_thread_idle);
-		if (!ctx->sq_thread_idle)
-			ctx->sq_thread_idle = HZ;
-
-		if (sqd->thread)
-			goto done;
-
-		if (p->flags & IORING_SETUP_SQ_AFF) {
-			int cpu = p->sq_thread_cpu;
-
-			ret = -EINVAL;
-			if (cpu >= nr_cpu_ids)
-				goto err;
-			if (!cpu_online(cpu))
-				goto err;
-
-			sqd->thread = kthread_create_on_cpu(io_sq_thread, sqd,
-							cpu, "io_uring-sq");
-		} else {
-			sqd->thread = kthread_create(io_sq_thread, sqd,
-							"io_uring-sq");
-		}
-		if (IS_ERR(sqd->thread)) {
-			ret = PTR_ERR(sqd->thread);
-			sqd->thread = NULL;
-			goto err;
-		}
-		ret = io_uring_alloc_task_context(sqd->thread);
-		if (ret)
-			goto err;
-	} else if (p->flags & IORING_SETUP_SQ_AFF) {
-		/* Can't have SQ_AFF without SQPOLL */
-		ret = -EINVAL;
-		goto err;
-	}
-
-done:
-	ret = io_init_wq_offload(ctx, p);
-	if (ret)
-		goto err;
-
-	return 0;
-err:
-	io_finish_async(ctx);
-	return ret;
-}
-
-static void io_sq_offload_start(struct io_ring_ctx *ctx)
-{
-	struct io_sq_data *sqd = ctx->sq_data;
-
-	ctx->flags &= ~IORING_SETUP_R_DISABLED;
-	if ((ctx->flags & IORING_SETUP_SQPOLL) && sqd && sqd->thread)
-		wake_up_process(sqd->thread);
-}
-
-static inline void __io_unaccount_mem(struct user_struct *user,
-				      unsigned long nr_pages)
-{
-	atomic_long_sub(nr_pages, &user->locked_vm);
-}
-
-static inline int __io_account_mem(struct user_struct *user,
-				   unsigned long nr_pages)
-{
-	unsigned long page_limit, cur_pages, new_pages;
-
-	/* Don't allow more pages than we can safely lock */
-	page_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
-
-	do {
-		cur_pages = atomic_long_read(&user->locked_vm);
-		new_pages = cur_pages + nr_pages;
-		if (new_pages > page_limit)
-			return -ENOMEM;
-	} while (atomic_long_cmpxchg(&user->locked_vm, cur_pages,
-					new_pages) != cur_pages);
-
-	return 0;
-}
-
-static void io_unaccount_mem(struct io_ring_ctx *ctx, unsigned long nr_pages,
-			     enum io_mem_account acct)
-{
-	if (ctx->limit_mem)
-		__io_unaccount_mem(ctx->user, nr_pages);
-
-	if (ctx->mm_account) {
-		if (acct == ACCT_LOCKED)
-			ctx->mm_account->locked_vm -= nr_pages;
-		else if (acct == ACCT_PINNED)
-			atomic64_sub(nr_pages, &ctx->mm_account->pinned_vm);
-	}
-}
-
-static int io_account_mem(struct io_ring_ctx *ctx, unsigned long nr_pages,
-			  enum io_mem_account acct)
-{
-	int ret;
-
-	if (ctx->limit_mem) {
-		ret = __io_account_mem(ctx->user, nr_pages);
-		if (ret)
-			return ret;
-	}
-
-	if (ctx->mm_account) {
-		if (acct == ACCT_LOCKED)
-			ctx->mm_account->locked_vm += nr_pages;
-		else if (acct == ACCT_PINNED)
-			atomic64_add(nr_pages, &ctx->mm_account->pinned_vm);
-	}
-
-	return 0;
-}
-
-static void io_mem_free(void *ptr)
-{
-	struct page *page;
-
-	if (!ptr)
-		return;
-
-	page = virt_to_head_page(ptr);
-	if (put_page_testzero(page))
-		free_compound_page(page);
-}
-
-static void *io_mem_alloc(size_t size)
-{
-	gfp_t gfp_flags = GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN | __GFP_COMP |
-				__GFP_NORETRY;
-
-	return (void *) __get_free_pages(gfp_flags, get_order(size));
-}
-
-static unsigned long rings_size(unsigned sq_entries, unsigned cq_entries,
-				size_t *sq_offset)
-{
-	struct io_rings *rings;
-	size_t off, sq_array_size;
-
-	off = struct_size(rings, cqes, cq_entries);
-	if (off == SIZE_MAX)
-		return SIZE_MAX;
-
-#ifdef CONFIG_SMP
-	off = ALIGN(off, SMP_CACHE_BYTES);
-	if (off == 0)
-		return SIZE_MAX;
-#endif
-
-	if (sq_offset)
-		*sq_offset = off;
-
-	sq_array_size = array_size(sizeof(u32), sq_entries);
-	if (sq_array_size == SIZE_MAX)
-		return SIZE_MAX;
-
-	if (check_add_overflow(off, sq_array_size, &off))
-		return SIZE_MAX;
-
-	return off;
-}
-
-static unsigned long ring_pages(unsigned sq_entries, unsigned cq_entries)
-{
-	size_t pages;
-
-	pages = (size_t)1 << get_order(
-		rings_size(sq_entries, cq_entries, NULL));
-	pages += (size_t)1 << get_order(
-		array_size(sizeof(struct io_uring_sqe), sq_entries));
-
-	return pages;
-}
-
-static int io_sqe_buffer_unregister(struct io_ring_ctx *ctx)
-{
-	int i, j;
-
-	if (!ctx->user_bufs)
-		return -ENXIO;
-
-	for (i = 0; i < ctx->nr_user_bufs; i++) {
-		struct io_mapped_ubuf *imu = &ctx->user_bufs[i];
-
-		for (j = 0; j < imu->nr_bvecs; j++)
-			unpin_user_page(imu->bvec[j].bv_page);
-
-		if (imu->acct_pages)
-			io_unaccount_mem(ctx, imu->acct_pages, ACCT_PINNED);
-		kvfree(imu->bvec);
-		imu->nr_bvecs = 0;
-	}
-
-	kfree(ctx->user_bufs);
-	ctx->user_bufs = NULL;
-	ctx->nr_user_bufs = 0;
-	return 0;
-}
-
-static int io_copy_iov(struct io_ring_ctx *ctx, struct iovec *dst,
-		       void __user *arg, unsigned index)
-{
-	struct iovec __user *src;
-
-#ifdef CONFIG_COMPAT
-	if (ctx->compat) {
-		struct compat_iovec __user *ciovs;
-		struct compat_iovec ciov;
-
-		ciovs = (struct compat_iovec __user *) arg;
-		if (copy_from_user(&ciov, &ciovs[index], sizeof(ciov)))
-			return -EFAULT;
-
-		dst->iov_base = u64_to_user_ptr((u64)ciov.iov_base);
-		dst->iov_len = ciov.iov_len;
-		return 0;
-	}
-#endif
-	src = (struct iovec __user *) arg;
-	if (copy_from_user(dst, &src[index], sizeof(*dst)))
-		return -EFAULT;
-	return 0;
-}
-
-/*
- * Not super efficient, but this is just a registration time. And we do cache
- * the last compound head, so generally we'll only do a full search if we don't
- * match that one.
- *
- * We check if the given compound head page has already been accounted, to
- * avoid double accounting it. This allows us to account the full size of the
- * page, not just the constituent pages of a huge page.
- */
-static bool headpage_already_acct(struct io_ring_ctx *ctx, struct page **pages,
-				  int nr_pages, struct page *hpage)
-{
-	int i, j;
-
-	/* check current page array */
-	for (i = 0; i < nr_pages; i++) {
-		if (!PageCompound(pages[i]))
-			continue;
-		if (compound_head(pages[i]) == hpage)
-			return true;
-	}
-
-	/* check previously registered pages */
-	for (i = 0; i < ctx->nr_user_bufs; i++) {
-		struct io_mapped_ubuf *imu = &ctx->user_bufs[i];
-
-		for (j = 0; j < imu->nr_bvecs; j++) {
-			if (!PageCompound(imu->bvec[j].bv_page))
-				continue;
-			if (compound_head(imu->bvec[j].bv_page) == hpage)
-				return true;
-		}
-	}
-
-	return false;
-}
-
-static int io_buffer_account_pin(struct io_ring_ctx *ctx, struct page **pages,
-				 int nr_pages, struct io_mapped_ubuf *imu,
-				 struct page **last_hpage)
-{
-	int i, ret;
-
-	for (i = 0; i < nr_pages; i++) {
-		if (!PageCompound(pages[i])) {
-			imu->acct_pages++;
-		} else {
-			struct page *hpage;
-
-			hpage = compound_head(pages[i]);
-			if (hpage == *last_hpage)
-				continue;
-			*last_hpage = hpage;
-			if (headpage_already_acct(ctx, pages, i, hpage))
-				continue;
-			imu->acct_pages += page_size(hpage) >> PAGE_SHIFT;
-		}
-	}
-
-	if (!imu->acct_pages)
-		return 0;
-
-	ret = io_account_mem(ctx, imu->acct_pages, ACCT_PINNED);
-	if (ret)
-		imu->acct_pages = 0;
-	return ret;
-}
-
-static int io_sqe_buffer_register(struct io_ring_ctx *ctx, void __user *arg,
-				  unsigned nr_args)
-{
-	struct vm_area_struct **vmas = NULL;
-	struct page **pages = NULL;
-	struct page *last_hpage = NULL;
-	int i, j, got_pages = 0;
-	int ret = -EINVAL;
-
-	if (ctx->user_bufs)
-		return -EBUSY;
-	if (!nr_args || nr_args > UIO_MAXIOV)
-		return -EINVAL;
-
-	ctx->user_bufs = kcalloc(nr_args, sizeof(struct io_mapped_ubuf),
-					GFP_KERNEL);
-	if (!ctx->user_bufs)
-		return -ENOMEM;
-
-	for (i = 0; i < nr_args; i++) {
-		struct io_mapped_ubuf *imu = &ctx->user_bufs[i];
-		unsigned long off, start, end, ubuf;
-		int pret, nr_pages;
-		struct iovec iov;
-		size_t size;
-
-		ret = io_copy_iov(ctx, &iov, arg, i);
-		if (ret)
-			goto err;
-
-		/*
-		 * Don't impose further limits on the size and buffer
-		 * constraints here, we'll -EINVAL later when IO is
-		 * submitted if they are wrong.
-		 */
-		ret = -EFAULT;
-		if (!iov.iov_base || !iov.iov_len)
-			goto err;
-
-		/* arbitrary limit, but we need something */
-		if (iov.iov_len > SZ_1G)
-			goto err;
-
-		ubuf = (unsigned long) iov.iov_base;
-		end = (ubuf + iov.iov_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
-		start = ubuf >> PAGE_SHIFT;
-		nr_pages = end - start;
-
-		ret = 0;
-		if (!pages || nr_pages > got_pages) {
-			kvfree(vmas);
-			kvfree(pages);
-			pages = kvmalloc_array(nr_pages, sizeof(struct page *),
-						GFP_KERNEL);
-			vmas = kvmalloc_array(nr_pages,
-					sizeof(struct vm_area_struct *),
-					GFP_KERNEL);
-			if (!pages || !vmas) {
-				ret = -ENOMEM;
-				goto err;
-			}
-			got_pages = nr_pages;
-		}
-
-		imu->bvec = kvmalloc_array(nr_pages, sizeof(struct bio_vec),
-						GFP_KERNEL);
-		ret = -ENOMEM;
-		if (!imu->bvec)
-			goto err;
-
-		ret = 0;
-		mmap_read_lock(current->mm);
-		pret = pin_user_pages(ubuf, nr_pages,
-				      FOLL_WRITE | FOLL_LONGTERM,
-				      pages, vmas);
-		if (pret == nr_pages) {
-			/* don't support file backed memory */
-			for (j = 0; j < nr_pages; j++) {
-				struct vm_area_struct *vma = vmas[j];
-
-				if (vma->vm_file &&
-				    !is_file_hugepages(vma->vm_file)) {
-					ret = -EOPNOTSUPP;
-					break;
-				}
-			}
-		} else {
-			ret = pret < 0 ? pret : -EFAULT;
-		}
-		mmap_read_unlock(current->mm);
-		if (ret) {
-			/*
-			 * if we did partial map, or found file backed vmas,
-			 * release any pages we did get
-			 */
-			if (pret > 0)
-				unpin_user_pages(pages, pret);
-			kvfree(imu->bvec);
-			goto err;
-		}
-
-		ret = io_buffer_account_pin(ctx, pages, pret, imu, &last_hpage);
-		if (ret) {
-			unpin_user_pages(pages, pret);
-			kvfree(imu->bvec);
-			goto err;
-		}
-
-		off = ubuf & ~PAGE_MASK;
-		size = iov.iov_len;
-		for (j = 0; j < nr_pages; j++) {
-			size_t vec_len;
-
-			vec_len = min_t(size_t, size, PAGE_SIZE - off);
-			imu->bvec[j].bv_page = pages[j];
-			imu->bvec[j].bv_len = vec_len;
-			imu->bvec[j].bv_offset = off;
-			off = 0;
-			size -= vec_len;
-		}
-		/* store original address for later verification */
-		imu->ubuf = ubuf;
-		imu->len = iov.iov_len;
-		imu->nr_bvecs = nr_pages;
-
-		ctx->nr_user_bufs++;
-	}
-	kvfree(pages);
-	kvfree(vmas);
-	return 0;
-err:
-	kvfree(pages);
-	kvfree(vmas);
-	io_sqe_buffer_unregister(ctx);
-	return ret;
-}
-
-static int io_eventfd_register(struct io_ring_ctx *ctx, void __user *arg)
-{
-	__s32 __user *fds = arg;
-	int fd;
-
-	if (ctx->cq_ev_fd)
-		return -EBUSY;
-
-	if (copy_from_user(&fd, fds, sizeof(*fds)))
-		return -EFAULT;
-
-	ctx->cq_ev_fd = eventfd_ctx_fdget(fd);
-	if (IS_ERR(ctx->cq_ev_fd)) {
-		int ret = PTR_ERR(ctx->cq_ev_fd);
-		ctx->cq_ev_fd = NULL;
-		return ret;
-	}
-
-	return 0;
-}
-
-static int io_eventfd_unregister(struct io_ring_ctx *ctx)
-{
-	if (ctx->cq_ev_fd) {
-		eventfd_ctx_put(ctx->cq_ev_fd);
-		ctx->cq_ev_fd = NULL;
-		return 0;
-	}
-
-	return -ENXIO;
-}
-
-static void io_destroy_buffers(struct io_ring_ctx *ctx)
-{
-	struct io_buffer *buf;
-	unsigned long index;
-
-	xa_for_each(&ctx->io_buffers, index, buf)
-		__io_remove_buffers(ctx, buf, index, -1U);
-}
-
-static void io_ring_ctx_free(struct io_ring_ctx *ctx)
-{
-	io_finish_async(ctx);
-	io_sqe_buffer_unregister(ctx);
-
-	if (ctx->sqo_task) {
-		put_task_struct(ctx->sqo_task);
-		ctx->sqo_task = NULL;
-	}
-
-#ifdef CONFIG_BLK_CGROUP
-	if (ctx->sqo_blkcg_css)
-		css_put(ctx->sqo_blkcg_css);
-#endif
-
-	mutex_lock(&ctx->uring_lock);
-	io_sqe_files_unregister(ctx);
-	mutex_unlock(&ctx->uring_lock);
-	io_eventfd_unregister(ctx);
-	io_destroy_buffers(ctx);
-
-#if defined(CONFIG_UNIX)
-	if (ctx->ring_sock) {
-		ctx->ring_sock->file = NULL; /* so that iput() is called */
-		sock_release(ctx->ring_sock);
-	}
-#endif
-
-	if (ctx->mm_account) {
-		mmdrop(ctx->mm_account);
-		ctx->mm_account = NULL;
-	}
-
-	io_mem_free(ctx->rings);
-	io_mem_free(ctx->sq_sqes);
-
-	percpu_ref_exit(&ctx->refs);
-	free_uid(ctx->user);
-	put_cred(ctx->creds);
-	kfree(ctx->cancel_hash);
-	kmem_cache_free(req_cachep, ctx->fallback_req);
-	kfree(ctx);
-}
-
-static __poll_t io_uring_poll(struct file *file, poll_table *wait)
-{
-	struct io_ring_ctx *ctx = file->private_data;
-	__poll_t mask = 0;
-
-	poll_wait(file, &ctx->cq_wait, wait);
-	/*
-	 * synchronizes with barrier from wq_has_sleeper call in
-	 * io_commit_cqring
-	 */
-	smp_rmb();
-	if (!io_sqring_full(ctx))
-		mask |= EPOLLOUT | EPOLLWRNORM;
-
-	/*
-	 * Don't flush cqring overflow list here, just do a simple check.
-	 * Otherwise there could possible be ABBA deadlock:
-	 *      CPU0                    CPU1
-	 *      ----                    ----
-	 * lock(&ctx->uring_lock);
-	 *                              lock(&ep->mtx);
-	 *                              lock(&ctx->uring_lock);
-	 * lock(&ep->mtx);
-	 *
-	 * Users may get EPOLLIN meanwhile seeing nothing in cqring, this
-	 * pushs them to do the flush.
-	 */
-	if (io_cqring_events(ctx) || test_bit(0, &ctx->cq_check_overflow))
-		mask |= EPOLLIN | EPOLLRDNORM;
-
-	return mask;
-}
-
-static int io_uring_fasync(int fd, struct file *file, int on)
-{
-	struct io_ring_ctx *ctx = file->private_data;
-
-	return fasync_helper(fd, file, on, &ctx->cq_fasync);
-}
-
-static int io_unregister_personality(struct io_ring_ctx *ctx, unsigned id)
-{
-	struct io_identity *iod;
-
-	iod = xa_erase(&ctx->personalities, id);
-	if (iod) {
-		put_cred(iod->creds);
-		if (refcount_dec_and_test(&iod->count))
-			kfree(iod);
-		return 0;
-	}
-
-	return -EINVAL;
-}
-
-static void io_ring_exit_work(struct work_struct *work)
-{
-	struct io_ring_ctx *ctx = container_of(work, struct io_ring_ctx,
-					       exit_work);
-
-	/*
-	 * If we're doing polled IO and end up having requests being
-	 * submitted async (out-of-line), then completions can come in while
-	 * we're waiting for refs to drop. We need to reap these manually,
-	 * as nobody else will be looking for them.
-	 */
-	do {
-		io_iopoll_try_reap_events(ctx);
-	} while (!wait_for_completion_timeout(&ctx->ref_comp, HZ/20));
-	io_ring_ctx_free(ctx);
-}
-
-static bool io_cancel_ctx_cb(struct io_wq_work *work, void *data)
-{
-	struct io_kiocb *req = container_of(work, struct io_kiocb, work);
-
-	return req->ctx == data;
-}
-
-static void io_ring_ctx_wait_and_kill(struct io_ring_ctx *ctx)
-{
-	unsigned long index;
-	struct io_identify *iod;
-
-	mutex_lock(&ctx->uring_lock);
-	percpu_ref_kill(&ctx->refs);
-	/* if force is set, the ring is going away. always drop after that */
-
-	if (WARN_ON_ONCE((ctx->flags & IORING_SETUP_SQPOLL) && !ctx->sqo_dead))
-		ctx->sqo_dead = 1;
-
-	ctx->cq_overflow_flushed = 1;
-	if (ctx->rings)
-		__io_cqring_overflow_flush(ctx, true, NULL, NULL);
-	mutex_unlock(&ctx->uring_lock);
-
-	io_kill_timeouts(ctx, NULL, NULL);
-	io_poll_remove_all(ctx, NULL, NULL);
-
-	if (ctx->io_wq)
-		io_wq_cancel_cb(ctx->io_wq, io_cancel_ctx_cb, ctx, true);
-
-	/* if we failed setting up the ctx, we might not have any rings */
-	io_iopoll_try_reap_events(ctx);
-	xa_for_each(&ctx->personalities, index, iod)
-		 io_unregister_personality(ctx, index);
-
-	/*
-	 * Do this upfront, so we won't have a grace period where the ring
-	 * is closed but resources aren't reaped yet. This can cause
-	 * spurious failure in setting up a new ring.
-	 */
-	io_unaccount_mem(ctx, ring_pages(ctx->sq_entries, ctx->cq_entries),
-			 ACCT_LOCKED);
-
-	INIT_WORK(&ctx->exit_work, io_ring_exit_work);
-	/*
-	 * Use system_unbound_wq to avoid spawning tons of event kworkers
-	 * if we're exiting a ton of rings at the same time. It just adds
-	 * noise and overhead, there's no discernable change in runtime
-	 * over using system_wq.
-	 */
-	queue_work(system_unbound_wq, &ctx->exit_work);
-}
-
-static int io_uring_release(struct inode *inode, struct file *file)
-{
-	struct io_ring_ctx *ctx = file->private_data;
-
-	file->private_data = NULL;
-	io_ring_ctx_wait_and_kill(ctx);
-	return 0;
-}
-
-struct io_task_cancel {
-	struct task_struct *task;
-	struct files_struct *files;
-};
-
-static bool io_cancel_task_cb(struct io_wq_work *work, void *data)
-{
-	struct io_kiocb *req = container_of(work, struct io_kiocb, work);
-	struct io_task_cancel *cancel = data;
-	bool ret;
-
-	if (cancel->files && (req->flags & REQ_F_LINK_TIMEOUT)) {
-		unsigned long flags;
-		struct io_ring_ctx *ctx = req->ctx;
-
-		/* protect against races with linked timeouts */
-		spin_lock_irqsave(&ctx->completion_lock, flags);
-		ret = io_match_task(req, cancel->task, cancel->files);
-		spin_unlock_irqrestore(&ctx->completion_lock, flags);
-	} else {
-		ret = io_match_task(req, cancel->task, cancel->files);
-	}
-	return ret;
-}
-
-static void io_cancel_defer_files(struct io_ring_ctx *ctx,
-				  struct task_struct *task,
-				  struct files_struct *files)
-{
-	struct io_defer_entry *de = NULL;
-	LIST_HEAD(list);
-
-	spin_lock_irq(&ctx->completion_lock);
-	list_for_each_entry_reverse(de, &ctx->defer_list, list) {
-		if (io_match_task(de->req, task, files)) {
-			list_cut_position(&list, &ctx->defer_list, &de->list);
-			break;
-		}
-	}
-	spin_unlock_irq(&ctx->completion_lock);
-
-	while (!list_empty(&list)) {
-		de = list_first_entry(&list, struct io_defer_entry, list);
-		list_del_init(&de->list);
-		req_set_fail_links(de->req);
-		io_put_req(de->req);
-		io_req_complete(de->req, -ECANCELED);
-		kfree(de);
-	}
-}
-
-static int io_uring_count_inflight(struct io_ring_ctx *ctx,
-				   struct task_struct *task,
-				   struct files_struct *files)
-{
-	struct io_kiocb *req;
-	int cnt = 0;
-
-	spin_lock_irq(&ctx->inflight_lock);
-	list_for_each_entry(req, &ctx->inflight_list, inflight_entry)
-		cnt += io_match_task(req, task, files);
-	spin_unlock_irq(&ctx->inflight_lock);
-	return cnt;
-}
-
-static void io_uring_cancel_files(struct io_ring_ctx *ctx,
-				  struct task_struct *task,
-				  struct files_struct *files)
-{
-	while (!list_empty_careful(&ctx->inflight_list)) {
-		struct io_task_cancel cancel = { .task = task, .files = files };
-		DEFINE_WAIT(wait);
-		int inflight;
-
-		inflight = io_uring_count_inflight(ctx, task, files);
-		if (!inflight)
-			break;
-
-		io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true);
-		io_poll_remove_all(ctx, task, files);
-		io_kill_timeouts(ctx, task, files);
-		/* cancellations _may_ trigger task work */
-		io_run_task_work();
-
-		prepare_to_wait(&task->io_uring->wait, &wait,
-				TASK_UNINTERRUPTIBLE);
-		if (inflight == io_uring_count_inflight(ctx, task, files))
-			schedule();
-		finish_wait(&task->io_uring->wait, &wait);
-	}
-}
-
-static void __io_uring_cancel_task_requests(struct io_ring_ctx *ctx,
-					    struct task_struct *task)
-{
-	while (1) {
-		struct io_task_cancel cancel = { .task = task, .files = NULL, };
-		enum io_wq_cancel cret;
-		bool ret = false;
-
-		cret = io_wq_cancel_cb(ctx->io_wq, io_cancel_task_cb, &cancel, true);
-		if (cret != IO_WQ_CANCEL_NOTFOUND)
-			ret = true;
-
-		/* SQPOLL thread does its own polling */
-		if (!(ctx->flags & IORING_SETUP_SQPOLL)) {
-			while (!list_empty_careful(&ctx->iopoll_list)) {
-				io_iopoll_try_reap_events(ctx);
-				ret = true;
-			}
-		}
-
-		ret |= io_poll_remove_all(ctx, task, NULL);
-		ret |= io_kill_timeouts(ctx, task, NULL);
-		if (!ret)
-			break;
-		io_run_task_work();
-		cond_resched();
-	}
-}
-
-static void io_disable_sqo_submit(struct io_ring_ctx *ctx)
-{
-	mutex_lock(&ctx->uring_lock);
-	ctx->sqo_dead = 1;
-	if (ctx->flags & IORING_SETUP_R_DISABLED)
-		io_sq_offload_start(ctx);
-	mutex_unlock(&ctx->uring_lock);
-
-	/* make sure callers enter the ring to get error */
-	if (ctx->rings)
-		io_ring_set_wakeup_flag(ctx);
-}
-
-/*
- * We need to iteratively cancel requests, in case a request has dependent
- * hard links. These persist even for failure of cancelations, hence keep
- * looping until none are found.
- */
-static void io_uring_cancel_task_requests(struct io_ring_ctx *ctx,
-					  struct files_struct *files)
-{
-	struct task_struct *task = current;
-
-	if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) {
-		io_disable_sqo_submit(ctx);
-		task = ctx->sq_data->thread;
-		atomic_inc(&task->io_uring->in_idle);
-		io_sq_thread_park(ctx->sq_data);
-	}
-
-	io_cancel_defer_files(ctx, task, files);
-	io_cqring_overflow_flush(ctx, true, task, files);
-
-	if (!files)
-		__io_uring_cancel_task_requests(ctx, task);
-	else
-		io_uring_cancel_files(ctx, task, files);
-
-	if ((ctx->flags & IORING_SETUP_SQPOLL) && ctx->sq_data) {
-		atomic_dec(&task->io_uring->in_idle);
-		io_sq_thread_unpark(ctx->sq_data);
-	}
-}
-
-/*
- * Note that this task has used io_uring. We use it for cancelation purposes.
- */
-static int io_uring_add_task_file(struct io_ring_ctx *ctx, struct file *file)
-{
-	struct io_uring_task *tctx = current->io_uring;
-	int ret;
-
-	if (unlikely(!tctx)) {
-		ret = io_uring_alloc_task_context(current);
-		if (unlikely(ret))
-			return ret;
-		tctx = current->io_uring;
-	}
-	if (tctx->last != file) {
-		void *old = xa_load(&tctx->xa, (unsigned long)file);
-
-		if (!old) {
-			get_file(file);
-			ret = xa_err(xa_store(&tctx->xa, (unsigned long)file,
-						file, GFP_KERNEL));
-			if (ret) {
-				fput(file);
-				return ret;
-			}
-		}
-		tctx->last = file;
-	}
-
-	/*
-	 * This is race safe in that the task itself is doing this, hence it
-	 * cannot be going through the exit/cancel paths at the same time.
-	 * This cannot be modified while exit/cancel is running.
-	 */
-	if (!tctx->sqpoll && (ctx->flags & IORING_SETUP_SQPOLL))
-		tctx->sqpoll = true;
-
-	return 0;
-}
-
-/*
- * Remove this io_uring_file -> task mapping.
- */
-static void io_uring_del_task_file(struct file *file)
-{
-	struct io_uring_task *tctx = current->io_uring;
-
-	if (tctx->last == file)
-		tctx->last = NULL;
-	file = xa_erase(&tctx->xa, (unsigned long)file);
-	if (file)
-		fput(file);
-}
-
-static void io_uring_remove_task_files(struct io_uring_task *tctx)
-{
-	struct file *file;
-	unsigned long index;
-
-	xa_for_each(&tctx->xa, index, file)
-		io_uring_del_task_file(file);
-}
-
-void __io_uring_files_cancel(struct files_struct *files)
-{
-	struct io_uring_task *tctx = current->io_uring;
-	struct file *file;
-	unsigned long index;
-
-	/* make sure overflow events are dropped */
-	atomic_inc(&tctx->in_idle);
-	xa_for_each(&tctx->xa, index, file)
-		io_uring_cancel_task_requests(file->private_data, files);
-	atomic_dec(&tctx->in_idle);
-
-	if (files)
-		io_uring_remove_task_files(tctx);
-}
-
-static s64 tctx_inflight(struct io_uring_task *tctx)
-{
-	unsigned long index;
-	struct file *file;
-	s64 inflight;
-
-	inflight = percpu_counter_sum(&tctx->inflight);
-	if (!tctx->sqpoll)
-		return inflight;
-
-	/*
-	 * If we have SQPOLL rings, then we need to iterate and find them, and
-	 * add the pending count for those.
-	 */
-	xa_for_each(&tctx->xa, index, file) {
-		struct io_ring_ctx *ctx = file->private_data;
-
-		if (ctx->flags & IORING_SETUP_SQPOLL) {
-			struct io_uring_task *__tctx = ctx->sqo_task->io_uring;
-
-			inflight += percpu_counter_sum(&__tctx->inflight);
-		}
-	}
-
-	return inflight;
-}
-
-/*
- * Find any io_uring fd that this task has registered or done IO on, and cancel
- * requests.
- */
-void __io_uring_task_cancel(void)
-{
-	struct io_uring_task *tctx = current->io_uring;
-	DEFINE_WAIT(wait);
-	s64 inflight;
-
-	/* make sure overflow events are dropped */
-	atomic_inc(&tctx->in_idle);
-
-	/* trigger io_disable_sqo_submit() */
-	if (tctx->sqpoll)
-		__io_uring_files_cancel(NULL);
-
-	do {
-		/* read completions before cancelations */
-		inflight = tctx_inflight(tctx);
-		if (!inflight)
-			break;
-		__io_uring_files_cancel(NULL);
-
-		prepare_to_wait(&tctx->wait, &wait, TASK_UNINTERRUPTIBLE);
-
-		/*
-		 * If we've seen completions, retry without waiting. This
-		 * avoids a race where a completion comes in before we did
-		 * prepare_to_wait().
-		 */
-		if (inflight == tctx_inflight(tctx))
-			schedule();
-		finish_wait(&tctx->wait, &wait);
-	} while (1);
-
-	atomic_dec(&tctx->in_idle);
-
-	io_uring_remove_task_files(tctx);
-}
-
-static int io_uring_flush(struct file *file, void *data)
-{
-	struct io_uring_task *tctx = current->io_uring;
-	struct io_ring_ctx *ctx = file->private_data;
-
-	if (fatal_signal_pending(current) || (current->flags & PF_EXITING))
-		io_uring_cancel_task_requests(ctx, NULL);
-
-	if (!tctx)
-		return 0;
-
-	/* we should have cancelled and erased it before PF_EXITING */
-	WARN_ON_ONCE((current->flags & PF_EXITING) &&
-		     xa_load(&tctx->xa, (unsigned long)file));
-
-	/*
-	 * fput() is pending, will be 2 if the only other ref is our potential
-	 * task file note. If the task is exiting, drop regardless of count.
-	 */
-	if (atomic_long_read(&file->f_count) != 2)
-		return 0;
-
-	if (ctx->flags & IORING_SETUP_SQPOLL) {
-		/* there is only one file note, which is owned by sqo_task */
-		WARN_ON_ONCE(ctx->sqo_task != current &&
-			     xa_load(&tctx->xa, (unsigned long)file));
-		/* sqo_dead check is for when this happens after cancellation */
-		WARN_ON_ONCE(ctx->sqo_task == current && !ctx->sqo_dead &&
-			     !xa_load(&tctx->xa, (unsigned long)file));
-
-		io_disable_sqo_submit(ctx);
-	}
-
-	if (!(ctx->flags & IORING_SETUP_SQPOLL) || ctx->sqo_task == current)
-		io_uring_del_task_file(file);
-	return 0;
-}
-
-static void *io_uring_validate_mmap_request(struct file *file,
-					    loff_t pgoff, size_t sz)
-{
-	struct io_ring_ctx *ctx = file->private_data;
-	loff_t offset = pgoff << PAGE_SHIFT;
-	struct page *page;
-	void *ptr;
-
-	switch (offset) {
-	case IORING_OFF_SQ_RING:
-	case IORING_OFF_CQ_RING:
-		ptr = ctx->rings;
-		break;
-	case IORING_OFF_SQES:
-		ptr = ctx->sq_sqes;
-		break;
-	default:
-		return ERR_PTR(-EINVAL);
-	}
-
-	page = virt_to_head_page(ptr);
-	if (sz > page_size(page))
-		return ERR_PTR(-EINVAL);
-
-	return ptr;
-}
-
-#ifdef CONFIG_MMU
-
-static int io_uring_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	size_t sz = vma->vm_end - vma->vm_start;
-	unsigned long pfn;
-	void *ptr;
-
-	ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz);
-	if (IS_ERR(ptr))
-		return PTR_ERR(ptr);
-
-	pfn = virt_to_phys(ptr) >> PAGE_SHIFT;
-	return remap_pfn_range(vma, vma->vm_start, pfn, sz, vma->vm_page_prot);
-}
-
-#else /* !CONFIG_MMU */
-
-static int io_uring_mmap(struct file *file, struct vm_area_struct *vma)
-{
-	return vma->vm_flags & (VM_SHARED | VM_MAYSHARE) ? 0 : -EINVAL;
-}
-
-static unsigned int io_uring_nommu_mmap_capabilities(struct file *file)
-{
-	return NOMMU_MAP_DIRECT | NOMMU_MAP_READ | NOMMU_MAP_WRITE;
-}
-
-static unsigned long io_uring_nommu_get_unmapped_area(struct file *file,
-	unsigned long addr, unsigned long len,
-	unsigned long pgoff, unsigned long flags)
-{
-	void *ptr;
-
-	ptr = io_uring_validate_mmap_request(file, pgoff, len);
-	if (IS_ERR(ptr))
-		return PTR_ERR(ptr);
-
-	return (unsigned long) ptr;
-}
-
-#endif /* !CONFIG_MMU */
-
-static int io_sqpoll_wait_sq(struct io_ring_ctx *ctx)
-{
-	int ret = 0;
-	DEFINE_WAIT(wait);
-
-	do {
-		if (!io_sqring_full(ctx))
-			break;
-
-		prepare_to_wait(&ctx->sqo_sq_wait, &wait, TASK_INTERRUPTIBLE);
-
-		if (unlikely(ctx->sqo_dead)) {
-			ret = -EOWNERDEAD;
-			break;
-		}
-
-		if (!io_sqring_full(ctx))
-			break;
-
-		schedule();
-	} while (!signal_pending(current));
-
-	finish_wait(&ctx->sqo_sq_wait, &wait);
-	return ret;
-}
-
-SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
-		u32, min_complete, u32, flags, const sigset_t __user *, sig,
-		size_t, sigsz)
-{
-	struct io_ring_ctx *ctx;
-	long ret = -EBADF;
-	int submitted = 0;
-	struct fd f;
-
-	io_run_task_work();
-
-	if (flags & ~(IORING_ENTER_GETEVENTS | IORING_ENTER_SQ_WAKEUP |
-			IORING_ENTER_SQ_WAIT))
-		return -EINVAL;
-
-	f = fdget(fd);
-	if (!f.file)
-		return -EBADF;
-
-	ret = -EOPNOTSUPP;
-	if (f.file->f_op != &io_uring_fops)
-		goto out_fput;
-
-	ret = -ENXIO;
-	ctx = f.file->private_data;
-	if (!percpu_ref_tryget(&ctx->refs))
-		goto out_fput;
-
-	ret = -EBADFD;
-	if (ctx->flags & IORING_SETUP_R_DISABLED)
-		goto out;
-
-	/*
-	 * For SQ polling, the thread will do all submissions and completions.
-	 * Just return the requested submit count, and wake the thread if
-	 * we were asked to.
-	 */
-	ret = 0;
-	if (ctx->flags & IORING_SETUP_SQPOLL) {
-		io_cqring_overflow_flush(ctx, false, NULL, NULL);
-
-		if (unlikely(ctx->sqo_dead)) {
-			ret = -EOWNERDEAD;
-			goto out;
-		}
-		if (flags & IORING_ENTER_SQ_WAKEUP)
-			wake_up(&ctx->sq_data->wait);
-		if (flags & IORING_ENTER_SQ_WAIT) {
-			ret = io_sqpoll_wait_sq(ctx);
-			if (ret)
-				goto out;
-		}
-		submitted = to_submit;
-	} else if (to_submit) {
-		ret = io_uring_add_task_file(ctx, f.file);
-		if (unlikely(ret))
-			goto out;
-		mutex_lock(&ctx->uring_lock);
-		submitted = io_submit_sqes(ctx, to_submit);
-		mutex_unlock(&ctx->uring_lock);
-
-		if (submitted != to_submit)
-			goto out;
-	}
-	if (flags & IORING_ENTER_GETEVENTS) {
-		min_complete = min(min_complete, ctx->cq_entries);
-
-		/*
-		 * When SETUP_IOPOLL and SETUP_SQPOLL are both enabled, user
-		 * space applications don't need to do io completion events
-		 * polling again, they can rely on io_sq_thread to do polling
-		 * work, which can reduce cpu usage and uring_lock contention.
-		 */
-		if (ctx->flags & IORING_SETUP_IOPOLL &&
-		    !(ctx->flags & IORING_SETUP_SQPOLL)) {
-			ret = io_iopoll_check(ctx, min_complete);
-		} else {
-			ret = io_cqring_wait(ctx, min_complete, sig, sigsz);
-		}
-	}
-
-out:
-	percpu_ref_put(&ctx->refs);
-out_fput:
-	fdput(f);
-	return submitted ? submitted : ret;
-}
-
-#ifdef CONFIG_PROC_FS
-static int io_uring_show_cred(struct seq_file *m, unsigned int id,
-		const struct io_identity *iod)
-{
-	const struct cred *cred = iod->creds;
-	struct user_namespace *uns = seq_user_ns(m);
-	struct group_info *gi;
-	kernel_cap_t cap;
-	unsigned __capi;
-	int g;
-
-	seq_printf(m, "%5d\n", id);
-	seq_put_decimal_ull(m, "\tUid:\t", from_kuid_munged(uns, cred->uid));
-	seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->euid));
-	seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->suid));
-	seq_put_decimal_ull(m, "\t\t", from_kuid_munged(uns, cred->fsuid));
-	seq_put_decimal_ull(m, "\n\tGid:\t", from_kgid_munged(uns, cred->gid));
-	seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->egid));
-	seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->sgid));
-	seq_put_decimal_ull(m, "\t\t", from_kgid_munged(uns, cred->fsgid));
-	seq_puts(m, "\n\tGroups:\t");
-	gi = cred->group_info;
-	for (g = 0; g < gi->ngroups; g++) {
-		seq_put_decimal_ull(m, g ? " " : "",
-					from_kgid_munged(uns, gi->gid[g]));
-	}
-	seq_puts(m, "\n\tCapEff:\t");
-	cap = cred->cap_effective;
-	CAP_FOR_EACH_U32(__capi)
-		seq_put_hex_ll(m, NULL, cap.cap[CAP_LAST_U32 - __capi], 8);
-	seq_putc(m, '\n');
-	return 0;
-}
-
-static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m)
-{
-	struct io_sq_data *sq = NULL;
-	bool has_lock;
-	int i;
-
-	/*
-	 * Avoid ABBA deadlock between the seq lock and the io_uring mutex,
-	 * since fdinfo case grabs it in the opposite direction of normal use
-	 * cases. If we fail to get the lock, we just don't iterate any
-	 * structures that could be going away outside the io_uring mutex.
-	 */
-	has_lock = mutex_trylock(&ctx->uring_lock);
-
-	if (has_lock && (ctx->flags & IORING_SETUP_SQPOLL))
-		sq = ctx->sq_data;
-
-	seq_printf(m, "SqThread:\t%d\n", sq ? task_pid_nr(sq->thread) : -1);
-	seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1);
-	seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files);
-	for (i = 0; has_lock && i < ctx->nr_user_files; i++) {
-		struct fixed_file_table *table;
-		struct file *f;
-
-		table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
-		f = table->files[i & IORING_FILE_TABLE_MASK];
-		if (f)
-			seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname);
-		else
-			seq_printf(m, "%5u: <none>\n", i);
-	}
-	seq_printf(m, "UserBufs:\t%u\n", ctx->nr_user_bufs);
-	for (i = 0; has_lock && i < ctx->nr_user_bufs; i++) {
-		struct io_mapped_ubuf *buf = &ctx->user_bufs[i];
-
-		seq_printf(m, "%5u: 0x%llx/%u\n", i, buf->ubuf,
-						(unsigned int) buf->len);
-	}
-	if (has_lock && !xa_empty(&ctx->personalities)) {
-		unsigned long index;
-		const struct io_identity *iod;
-
-		seq_printf(m, "Personalities:\n");
-		xa_for_each(&ctx->personalities, index, iod)
-			io_uring_show_cred(m, index, iod);
-	}
-	seq_printf(m, "PollList:\n");
-	spin_lock_irq(&ctx->completion_lock);
-	for (i = 0; i < (1U << ctx->cancel_hash_bits); i++) {
-		struct hlist_head *list = &ctx->cancel_hash[i];
-		struct io_kiocb *req;
-
-		hlist_for_each_entry(req, list, hash_node)
-			seq_printf(m, "  op=%d, task_works=%d\n", req->opcode,
-					req->task->task_works != NULL);
-	}
-	spin_unlock_irq(&ctx->completion_lock);
-	if (has_lock)
-		mutex_unlock(&ctx->uring_lock);
-}
-
-static void io_uring_show_fdinfo(struct seq_file *m, struct file *f)
-{
-	struct io_ring_ctx *ctx = f->private_data;
-
-	if (percpu_ref_tryget(&ctx->refs)) {
-		__io_uring_show_fdinfo(ctx, m);
-		percpu_ref_put(&ctx->refs);
-	}
-}
-#endif
-
-static const struct file_operations io_uring_fops = {
-	.release	= io_uring_release,
-	.flush		= io_uring_flush,
-	.mmap		= io_uring_mmap,
-#ifndef CONFIG_MMU
-	.get_unmapped_area = io_uring_nommu_get_unmapped_area,
-	.mmap_capabilities = io_uring_nommu_mmap_capabilities,
-#endif
-	.poll		= io_uring_poll,
-	.fasync		= io_uring_fasync,
-#ifdef CONFIG_PROC_FS
-	.show_fdinfo	= io_uring_show_fdinfo,
-#endif
-};
-
-static int io_allocate_scq_urings(struct io_ring_ctx *ctx,
-				  struct io_uring_params *p)
-{
-	struct io_rings *rings;
-	size_t size, sq_array_offset;
-
-	/* make sure these are sane, as we already accounted them */
-	ctx->sq_entries = p->sq_entries;
-	ctx->cq_entries = p->cq_entries;
-
-	size = rings_size(p->sq_entries, p->cq_entries, &sq_array_offset);
-	if (size == SIZE_MAX)
-		return -EOVERFLOW;
-
-	rings = io_mem_alloc(size);
-	if (!rings)
-		return -ENOMEM;
-
-	ctx->rings = rings;
-	ctx->sq_array = (u32 *)((char *)rings + sq_array_offset);
-	rings->sq_ring_mask = p->sq_entries - 1;
-	rings->cq_ring_mask = p->cq_entries - 1;
-	rings->sq_ring_entries = p->sq_entries;
-	rings->cq_ring_entries = p->cq_entries;
-	ctx->sq_mask = rings->sq_ring_mask;
-	ctx->cq_mask = rings->cq_ring_mask;
-
-	size = array_size(sizeof(struct io_uring_sqe), p->sq_entries);
-	if (size == SIZE_MAX) {
-		io_mem_free(ctx->rings);
-		ctx->rings = NULL;
-		return -EOVERFLOW;
-	}
-
-	ctx->sq_sqes = io_mem_alloc(size);
-	if (!ctx->sq_sqes) {
-		io_mem_free(ctx->rings);
-		ctx->rings = NULL;
-		return -ENOMEM;
-	}
-
-	return 0;
-}
-
-static int io_uring_install_fd(struct io_ring_ctx *ctx, struct file *file)
-{
-	int ret, fd;
-
-	fd = get_unused_fd_flags(O_RDWR | O_CLOEXEC);
-	if (fd < 0)
-		return fd;
-
-	ret = io_uring_add_task_file(ctx, file);
-	if (ret) {
-		put_unused_fd(fd);
-		return ret;
-	}
-	fd_install(fd, file);
-	return fd;
-}
-
-/*
- * Allocate an anonymous fd, this is what constitutes the application
- * visible backing of an io_uring instance. The application mmaps this
- * fd to gain access to the SQ/CQ ring details. If UNIX sockets are enabled,
- * we have to tie this fd to a socket for file garbage collection purposes.
- */
-static struct file *io_uring_get_file(struct io_ring_ctx *ctx)
-{
-	struct file *file;
-#if defined(CONFIG_UNIX)
-	int ret;
-
-	ret = sock_create_kern(&init_net, PF_UNIX, SOCK_RAW, IPPROTO_IP,
-				&ctx->ring_sock);
-	if (ret)
-		return ERR_PTR(ret);
-#endif
-
-	file = anon_inode_getfile("[io_uring]", &io_uring_fops, ctx,
-					O_RDWR | O_CLOEXEC);
-#if defined(CONFIG_UNIX)
-	if (IS_ERR(file)) {
-		sock_release(ctx->ring_sock);
-		ctx->ring_sock = NULL;
-	} else {
-		ctx->ring_sock->file = file;
-	}
-#endif
-	return file;
-}
-
-static int io_uring_create(unsigned entries, struct io_uring_params *p,
-			   struct io_uring_params __user *params)
-{
-	struct user_struct *user = NULL;
-	struct io_ring_ctx *ctx;
-	struct file *file;
-	bool limit_mem;
-	int ret;
-
-	if (!entries)
-		return -EINVAL;
-	if (entries > IORING_MAX_ENTRIES) {
-		if (!(p->flags & IORING_SETUP_CLAMP))
-			return -EINVAL;
-		entries = IORING_MAX_ENTRIES;
-	}
-
-	/*
-	 * Use twice as many entries for the CQ ring. It's possible for the
-	 * application to drive a higher depth than the size of the SQ ring,
-	 * since the sqes are only used at submission time. This allows for
-	 * some flexibility in overcommitting a bit. If the application has
-	 * set IORING_SETUP_CQSIZE, it will have passed in the desired number
-	 * of CQ ring entries manually.
-	 */
-	p->sq_entries = roundup_pow_of_two(entries);
-	if (p->flags & IORING_SETUP_CQSIZE) {
-		/*
-		 * If IORING_SETUP_CQSIZE is set, we do the same roundup
-		 * to a power-of-two, if it isn't already. We do NOT impose
-		 * any cq vs sq ring sizing.
-		 */
-		if (!p->cq_entries)
-			return -EINVAL;
-		if (p->cq_entries > IORING_MAX_CQ_ENTRIES) {
-			if (!(p->flags & IORING_SETUP_CLAMP))
-				return -EINVAL;
-			p->cq_entries = IORING_MAX_CQ_ENTRIES;
-		}
-		p->cq_entries = roundup_pow_of_two(p->cq_entries);
-		if (p->cq_entries < p->sq_entries)
-			return -EINVAL;
-	} else {
-		p->cq_entries = 2 * p->sq_entries;
-	}
-
-	user = get_uid(current_user());
-	limit_mem = !capable(CAP_IPC_LOCK);
-
-	if (limit_mem) {
-		ret = __io_account_mem(user,
-				ring_pages(p->sq_entries, p->cq_entries));
-		if (ret) {
-			free_uid(user);
-			return ret;
-		}
-	}
-
-	ctx = io_ring_ctx_alloc(p);
-	if (!ctx) {
-		if (limit_mem)
-			__io_unaccount_mem(user, ring_pages(p->sq_entries,
-								p->cq_entries));
-		free_uid(user);
-		return -ENOMEM;
-	}
-	ctx->compat = in_compat_syscall();
-	ctx->user = user;
-	ctx->creds = get_current_cred();
-#ifdef CONFIG_AUDIT
-	ctx->loginuid = current->loginuid;
-	ctx->sessionid = current->sessionid;
-#endif
-	ctx->sqo_task = get_task_struct(current);
-
-	/*
-	 * This is just grabbed for accounting purposes. When a process exits,
-	 * the mm is exited and dropped before the files, hence we need to hang
-	 * on to this mm purely for the purposes of being able to unaccount
-	 * memory (locked/pinned vm). It's not used for anything else.
-	 */
-	mmgrab(current->mm);
-	ctx->mm_account = current->mm;
-
-#ifdef CONFIG_BLK_CGROUP
-	/*
-	 * The sq thread will belong to the original cgroup it was inited in.
-	 * If the cgroup goes offline (e.g. disabling the io controller), then
-	 * issued bios will be associated with the closest cgroup later in the
-	 * block layer.
-	 */
-	rcu_read_lock();
-	ctx->sqo_blkcg_css = blkcg_css();
-	ret = css_tryget_online(ctx->sqo_blkcg_css);
-	rcu_read_unlock();
-	if (!ret) {
-		/* don't init against a dying cgroup, have the user try again */
-		ctx->sqo_blkcg_css = NULL;
-		ret = -ENODEV;
-		goto err;
-	}
-#endif
-
-	/*
-	 * Account memory _before_ installing the file descriptor. Once
-	 * the descriptor is installed, it can get closed at any time. Also
-	 * do this before hitting the general error path, as ring freeing
-	 * will un-account as well.
-	 */
-	io_account_mem(ctx, ring_pages(p->sq_entries, p->cq_entries),
-		       ACCT_LOCKED);
-	ctx->limit_mem = limit_mem;
-
-	ret = io_allocate_scq_urings(ctx, p);
-	if (ret)
-		goto err;
-
-	ret = io_sq_offload_create(ctx, p);
-	if (ret)
-		goto err;
-
-	if (!(p->flags & IORING_SETUP_R_DISABLED))
-		io_sq_offload_start(ctx);
-
-	memset(&p->sq_off, 0, sizeof(p->sq_off));
-	p->sq_off.head = offsetof(struct io_rings, sq.head);
-	p->sq_off.tail = offsetof(struct io_rings, sq.tail);
-	p->sq_off.ring_mask = offsetof(struct io_rings, sq_ring_mask);
-	p->sq_off.ring_entries = offsetof(struct io_rings, sq_ring_entries);
-	p->sq_off.flags = offsetof(struct io_rings, sq_flags);
-	p->sq_off.dropped = offsetof(struct io_rings, sq_dropped);
-	p->sq_off.array = (char *)ctx->sq_array - (char *)ctx->rings;
-
-	memset(&p->cq_off, 0, sizeof(p->cq_off));
-	p->cq_off.head = offsetof(struct io_rings, cq.head);
-	p->cq_off.tail = offsetof(struct io_rings, cq.tail);
-	p->cq_off.ring_mask = offsetof(struct io_rings, cq_ring_mask);
-	p->cq_off.ring_entries = offsetof(struct io_rings, cq_ring_entries);
-	p->cq_off.overflow = offsetof(struct io_rings, cq_overflow);
-	p->cq_off.cqes = offsetof(struct io_rings, cqes);
-	p->cq_off.flags = offsetof(struct io_rings, cq_flags);
-
-	p->features = IORING_FEAT_SINGLE_MMAP | IORING_FEAT_NODROP |
-			IORING_FEAT_SUBMIT_STABLE | IORING_FEAT_RW_CUR_POS |
-			IORING_FEAT_CUR_PERSONALITY | IORING_FEAT_FAST_POLL |
-			IORING_FEAT_POLL_32BITS;
-
-	if (copy_to_user(params, p, sizeof(*p))) {
-		ret = -EFAULT;
-		goto err;
-	}
-
-	file = io_uring_get_file(ctx);
-	if (IS_ERR(file)) {
-		ret = PTR_ERR(file);
-		goto err;
-	}
-
-	/*
-	 * Install ring fd as the very last thing, so we don't risk someone
-	 * having closed it before we finish setup
-	 */
-	ret = io_uring_install_fd(ctx, file);
-	if (ret < 0) {
-		io_disable_sqo_submit(ctx);
-		/* fput will clean it up */
-		fput(file);
-		return ret;
-	}
-
-	trace_io_uring_create(ret, ctx, p->sq_entries, p->cq_entries, p->flags);
-	return ret;
-err:
-	io_disable_sqo_submit(ctx);
-	io_ring_ctx_wait_and_kill(ctx);
-	return ret;
-}
-
-/*
- * Sets up an aio uring context, and returns the fd. Applications asks for a
- * ring size, we return the actual sq/cq ring sizes (among other things) in the
- * params structure passed in.
- */
-static long io_uring_setup(u32 entries, struct io_uring_params __user *params)
-{
-	struct io_uring_params p;
-	int i;
-
-	if (copy_from_user(&p, params, sizeof(p)))
-		return -EFAULT;
-	for (i = 0; i < ARRAY_SIZE(p.resv); i++) {
-		if (p.resv[i])
-			return -EINVAL;
-	}
-
-	if (p.flags & ~(IORING_SETUP_IOPOLL | IORING_SETUP_SQPOLL |
-			IORING_SETUP_SQ_AFF | IORING_SETUP_CQSIZE |
-			IORING_SETUP_CLAMP | IORING_SETUP_ATTACH_WQ |
-			IORING_SETUP_R_DISABLED))
-		return -EINVAL;
-
-	return  io_uring_create(entries, &p, params);
-}
-
-SYSCALL_DEFINE2(io_uring_setup, u32, entries,
-		struct io_uring_params __user *, params)
-{
-	return io_uring_setup(entries, params);
-}
-
-static int io_probe(struct io_ring_ctx *ctx, void __user *arg, unsigned nr_args)
-{
-	struct io_uring_probe *p;
-	size_t size;
-	int i, ret;
-
-	size = struct_size(p, ops, nr_args);
-	if (size == SIZE_MAX)
-		return -EOVERFLOW;
-	p = kzalloc(size, GFP_KERNEL);
-	if (!p)
-		return -ENOMEM;
-
-	ret = -EFAULT;
-	if (copy_from_user(p, arg, size))
-		goto out;
-	ret = -EINVAL;
-	if (memchr_inv(p, 0, size))
-		goto out;
-
-	p->last_op = IORING_OP_LAST - 1;
-	if (nr_args > IORING_OP_LAST)
-		nr_args = IORING_OP_LAST;
-
-	for (i = 0; i < nr_args; i++) {
-		p->ops[i].op = i;
-		if (!io_op_defs[i].not_supported)
-			p->ops[i].flags = IO_URING_OP_SUPPORTED;
-	}
-	p->ops_len = i;
-
-	ret = 0;
-	if (copy_to_user(arg, p, size))
-		ret = -EFAULT;
-out:
-	kfree(p);
-	return ret;
-}
-
-static int io_register_personality(struct io_ring_ctx *ctx)
-{
-	struct io_identity *iod;
-	u32 id;
-	int ret;
-
-	iod = kmalloc(sizeof(*iod), GFP_KERNEL);
-	if (unlikely(!iod))
-		return -ENOMEM;
-
-	io_init_identity(iod);
-	iod->creds = get_current_cred();
-
-	ret = xa_alloc_cyclic(&ctx->personalities, &id, (void *)iod,
-			XA_LIMIT(0, USHRT_MAX), &ctx->pers_next, GFP_KERNEL);
-	if (ret < 0) {
-		put_cred(iod->creds);
-		kfree(iod);
-		return ret;
-	}
-	return id;
-}
-
-static int io_register_restrictions(struct io_ring_ctx *ctx, void __user *arg,
-				    unsigned int nr_args)
-{
-	struct io_uring_restriction *res;
-	size_t size;
-	int i, ret;
-
-	/* Restrictions allowed only if rings started disabled */
-	if (!(ctx->flags & IORING_SETUP_R_DISABLED))
-		return -EBADFD;
-
-	/* We allow only a single restrictions registration */
-	if (ctx->restrictions.registered)
-		return -EBUSY;
-
-	if (!arg || nr_args > IORING_MAX_RESTRICTIONS)
-		return -EINVAL;
-
-	size = array_size(nr_args, sizeof(*res));
-	if (size == SIZE_MAX)
-		return -EOVERFLOW;
-
-	res = memdup_user(arg, size);
-	if (IS_ERR(res))
-		return PTR_ERR(res);
-
-	ret = 0;
-
-	for (i = 0; i < nr_args; i++) {
-		switch (res[i].opcode) {
-		case IORING_RESTRICTION_REGISTER_OP:
-			if (res[i].register_op >= IORING_REGISTER_LAST) {
-				ret = -EINVAL;
-				goto out;
-			}
-
-			__set_bit(res[i].register_op,
-				  ctx->restrictions.register_op);
-			break;
-		case IORING_RESTRICTION_SQE_OP:
-			if (res[i].sqe_op >= IORING_OP_LAST) {
-				ret = -EINVAL;
-				goto out;
-			}
-
-			__set_bit(res[i].sqe_op, ctx->restrictions.sqe_op);
-			break;
-		case IORING_RESTRICTION_SQE_FLAGS_ALLOWED:
-			ctx->restrictions.sqe_flags_allowed = res[i].sqe_flags;
-			break;
-		case IORING_RESTRICTION_SQE_FLAGS_REQUIRED:
-			ctx->restrictions.sqe_flags_required = res[i].sqe_flags;
-			break;
-		default:
-			ret = -EINVAL;
-			goto out;
-		}
-	}
-
-out:
-	/* Reset all restrictions if an error happened */
-	if (ret != 0)
-		memset(&ctx->restrictions, 0, sizeof(ctx->restrictions));
-	else
-		ctx->restrictions.registered = true;
-
-	kfree(res);
-	return ret;
-}
-
-static int io_register_enable_rings(struct io_ring_ctx *ctx)
-{
-	if (!(ctx->flags & IORING_SETUP_R_DISABLED))
-		return -EBADFD;
-
-	if (ctx->restrictions.registered)
-		ctx->restricted = 1;
-
-	io_sq_offload_start(ctx);
-	return 0;
-}
-
-static bool io_register_op_must_quiesce(int op)
-{
-	switch (op) {
-	case IORING_UNREGISTER_FILES:
-	case IORING_REGISTER_FILES_UPDATE:
-	case IORING_REGISTER_PROBE:
-	case IORING_REGISTER_PERSONALITY:
-	case IORING_UNREGISTER_PERSONALITY:
-		return false;
-	default:
-		return true;
-	}
-}
-
-static int __io_uring_register(struct io_ring_ctx *ctx, unsigned opcode,
-			       void __user *arg, unsigned nr_args)
-	__releases(ctx->uring_lock)
-	__acquires(ctx->uring_lock)
-{
-	int ret;
-
-	/*
-	 * We're inside the ring mutex, if the ref is already dying, then
-	 * someone else killed the ctx or is already going through
-	 * io_uring_register().
-	 */
-	if (percpu_ref_is_dying(&ctx->refs))
-		return -ENXIO;
-
-	if (io_register_op_must_quiesce(opcode)) {
-		percpu_ref_kill(&ctx->refs);
-
-		/*
-		 * Drop uring mutex before waiting for references to exit. If
-		 * another thread is currently inside io_uring_enter() it might
-		 * need to grab the uring_lock to make progress. If we hold it
-		 * here across the drain wait, then we can deadlock. It's safe
-		 * to drop the mutex here, since no new references will come in
-		 * after we've killed the percpu ref.
-		 */
-		mutex_unlock(&ctx->uring_lock);
-		do {
-			ret = wait_for_completion_interruptible(&ctx->ref_comp);
-			if (!ret)
-				break;
-			ret = io_run_task_work_sig();
-			if (ret < 0)
-				break;
-		} while (1);
-		mutex_lock(&ctx->uring_lock);
-
-		if (ret) {
-			io_refs_resurrect(&ctx->refs, &ctx->ref_comp);
-			return ret;
-		}
-	}
-
-	if (ctx->restricted) {
-		if (opcode >= IORING_REGISTER_LAST) {
-			ret = -EINVAL;
-			goto out;
-		}
-
-		if (!test_bit(opcode, ctx->restrictions.register_op)) {
-			ret = -EACCES;
-			goto out;
-		}
-	}
-
-	switch (opcode) {
-	case IORING_REGISTER_BUFFERS:
-		ret = io_sqe_buffer_register(ctx, arg, nr_args);
-		break;
-	case IORING_UNREGISTER_BUFFERS:
-		ret = -EINVAL;
-		if (arg || nr_args)
-			break;
-		ret = io_sqe_buffer_unregister(ctx);
-		break;
-	case IORING_REGISTER_FILES:
-		ret = io_sqe_files_register(ctx, arg, nr_args);
-		break;
-	case IORING_UNREGISTER_FILES:
-		ret = -EINVAL;
-		if (arg || nr_args)
-			break;
-		ret = io_sqe_files_unregister(ctx);
-		break;
-	case IORING_REGISTER_FILES_UPDATE:
-		ret = io_sqe_files_update(ctx, arg, nr_args);
-		break;
-	case IORING_REGISTER_EVENTFD:
-	case IORING_REGISTER_EVENTFD_ASYNC:
-		ret = -EINVAL;
-		if (nr_args != 1)
-			break;
-		ret = io_eventfd_register(ctx, arg);
-		if (ret)
-			break;
-		if (opcode == IORING_REGISTER_EVENTFD_ASYNC)
-			ctx->eventfd_async = 1;
-		else
-			ctx->eventfd_async = 0;
-		break;
-	case IORING_UNREGISTER_EVENTFD:
-		ret = -EINVAL;
-		if (arg || nr_args)
-			break;
-		ret = io_eventfd_unregister(ctx);
-		break;
-	case IORING_REGISTER_PROBE:
-		ret = -EINVAL;
-		if (!arg || nr_args > 256)
-			break;
-		ret = io_probe(ctx, arg, nr_args);
-		break;
-	case IORING_REGISTER_PERSONALITY:
-		ret = -EINVAL;
-		if (arg || nr_args)
-			break;
-		ret = io_register_personality(ctx);
-		break;
-	case IORING_UNREGISTER_PERSONALITY:
-		ret = -EINVAL;
-		if (arg)
-			break;
-		ret = io_unregister_personality(ctx, nr_args);
-		break;
-	case IORING_REGISTER_ENABLE_RINGS:
-		ret = -EINVAL;
-		if (arg || nr_args)
-			break;
-		ret = io_register_enable_rings(ctx);
-		break;
-	case IORING_REGISTER_RESTRICTIONS:
-		ret = io_register_restrictions(ctx, arg, nr_args);
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-
-out:
-	if (io_register_op_must_quiesce(opcode)) {
-		/* bring the ctx back to life */
-		percpu_ref_reinit(&ctx->refs);
-		reinit_completion(&ctx->ref_comp);
-	}
-	return ret;
-}
-
-SYSCALL_DEFINE4(io_uring_register, unsigned int, fd, unsigned int, opcode,
-		void __user *, arg, unsigned int, nr_args)
-{
-	struct io_ring_ctx *ctx;
-	long ret = -EBADF;
-	struct fd f;
-
-	f = fdget(fd);
-	if (!f.file)
-		return -EBADF;
-
-	ret = -EOPNOTSUPP;
-	if (f.file->f_op != &io_uring_fops)
-		goto out_fput;
-
-	ctx = f.file->private_data;
-
-	mutex_lock(&ctx->uring_lock);
-	ret = __io_uring_register(ctx, opcode, arg, nr_args);
-	mutex_unlock(&ctx->uring_lock);
-	trace_io_uring_register(ctx, opcode, ctx->nr_user_files, ctx->nr_user_bufs,
-							ctx->cq_ev_fd != NULL, ret);
-out_fput:
-	fdput(f);
-	return ret;
-}
-
-static int __init io_uring_init(void)
-{
-#define __BUILD_BUG_VERIFY_ELEMENT(stype, eoffset, etype, ename) do { \
-	BUILD_BUG_ON(offsetof(stype, ename) != eoffset); \
-	BUILD_BUG_ON(sizeof(etype) != sizeof_field(stype, ename)); \
-} while (0)
-
-#define BUILD_BUG_SQE_ELEM(eoffset, etype, ename) \
-	__BUILD_BUG_VERIFY_ELEMENT(struct io_uring_sqe, eoffset, etype, ename)
-	BUILD_BUG_ON(sizeof(struct io_uring_sqe) != 64);
-	BUILD_BUG_SQE_ELEM(0,  __u8,   opcode);
-	BUILD_BUG_SQE_ELEM(1,  __u8,   flags);
-	BUILD_BUG_SQE_ELEM(2,  __u16,  ioprio);
-	BUILD_BUG_SQE_ELEM(4,  __s32,  fd);
-	BUILD_BUG_SQE_ELEM(8,  __u64,  off);
-	BUILD_BUG_SQE_ELEM(8,  __u64,  addr2);
-	BUILD_BUG_SQE_ELEM(16, __u64,  addr);
-	BUILD_BUG_SQE_ELEM(16, __u64,  splice_off_in);
-	BUILD_BUG_SQE_ELEM(24, __u32,  len);
-	BUILD_BUG_SQE_ELEM(28,     __kernel_rwf_t, rw_flags);
-	BUILD_BUG_SQE_ELEM(28, /* compat */   int, rw_flags);
-	BUILD_BUG_SQE_ELEM(28, /* compat */ __u32, rw_flags);
-	BUILD_BUG_SQE_ELEM(28, __u32,  fsync_flags);
-	BUILD_BUG_SQE_ELEM(28, /* compat */ __u16,  poll_events);
-	BUILD_BUG_SQE_ELEM(28, __u32,  poll32_events);
-	BUILD_BUG_SQE_ELEM(28, __u32,  sync_range_flags);
-	BUILD_BUG_SQE_ELEM(28, __u32,  msg_flags);
-	BUILD_BUG_SQE_ELEM(28, __u32,  timeout_flags);
-	BUILD_BUG_SQE_ELEM(28, __u32,  accept_flags);
-	BUILD_BUG_SQE_ELEM(28, __u32,  cancel_flags);
-	BUILD_BUG_SQE_ELEM(28, __u32,  open_flags);
-	BUILD_BUG_SQE_ELEM(28, __u32,  statx_flags);
-	BUILD_BUG_SQE_ELEM(28, __u32,  fadvise_advice);
-	BUILD_BUG_SQE_ELEM(28, __u32,  splice_flags);
-	BUILD_BUG_SQE_ELEM(32, __u64,  user_data);
-	BUILD_BUG_SQE_ELEM(40, __u16,  buf_index);
-	BUILD_BUG_SQE_ELEM(42, __u16,  personality);
-	BUILD_BUG_SQE_ELEM(44, __s32,  splice_fd_in);
-
-	BUILD_BUG_ON(ARRAY_SIZE(io_op_defs) != IORING_OP_LAST);
-	BUILD_BUG_ON(__REQ_F_LAST_BIT >= 8 * sizeof(int));
-	req_cachep = KMEM_CACHE(io_kiocb, SLAB_HWCACHE_ALIGN | SLAB_PANIC);
-	return 0;
-};
-__initcall(io_uring_init);