From ec858afda857e361182ceafc3d2ba2b164b8e889 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Wed, 30 Mar 2022 11:06:02 -0600
Subject: io_uring: don't check req->file in io_fsync_prep()

This is a leftover from the really old days where we weren't able to
track and error early if we need a file and it wasn't assigned. Kill
the check.

Cc: stable@vger.kernel.org # v5.15+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 3 ---
 1 file changed, 3 deletions(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index a8413f006417..9108c56bff5b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -4513,9 +4513,6 @@ static int io_fsync_prep(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 ||
-- 
cgit v1.2.3


From a3e4bc23d5470b2beb7cc42a86b6a3e75b704c15 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Tue, 29 Mar 2022 10:59:20 -0600
Subject: io_uring: defer splice/tee file validity check until command issue

In preparation for not using the file at prep time, defer checking if this
file refers to a valid io_uring instance until issue time.

This also means we can get rid of the cleanup flag for splice and tee.

Cc: stable@vger.kernel.org # v5.15+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 49 +++++++++++++++++++++----------------------------
 1 file changed, 21 insertions(+), 28 deletions(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 9108c56bff5b..0152ef49cf46 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -654,10 +654,10 @@ struct io_epoll {
 
 struct io_splice {
 	struct file			*file_out;
-	struct file			*file_in;
 	loff_t				off_out;
 	loff_t				off_in;
 	u64				len;
+	int				splice_fd_in;
 	unsigned int			flags;
 };
 
@@ -1687,14 +1687,6 @@ static void io_prep_async_work(struct io_kiocb *req)
 		if (def->unbound_nonreg_file)
 			req->work.flags |= IO_WQ_WORK_UNBOUND;
 	}
-
-	switch (req->opcode) {
-	case IORING_OP_SPLICE:
-	case IORING_OP_TEE:
-		if (!S_ISREG(file_inode(req->splice.file_in)->i_mode))
-			req->work.flags |= IO_WQ_WORK_UNBOUND;
-		break;
-	}
 }
 
 static void io_prep_async_link(struct io_kiocb *req)
@@ -4369,18 +4361,11 @@ static int __io_splice_prep(struct io_kiocb *req,
 	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(req->ctx, 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;
+	sp->splice_fd_in = READ_ONCE(sqe->splice_fd_in);
 	return 0;
 }
 
@@ -4395,20 +4380,27 @@ static int io_tee_prep(struct io_kiocb *req,
 static int io_tee(struct io_kiocb *req, unsigned int issue_flags)
 {
 	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;
+	struct file *in;
 	long ret = 0;
 
 	if (issue_flags & IO_URING_F_NONBLOCK)
 		return -EAGAIN;
+
+	in = io_file_get(req->ctx, req, sp->splice_fd_in,
+				  (sp->flags & SPLICE_F_FD_IN_FIXED));
+	if (!in) {
+		ret = -EBADF;
+		goto done;
+	}
+
 	if (sp->len)
 		ret = do_tee(in, out, sp->len, flags);
 
 	if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
 		io_put_file(in);
-	req->flags &= ~REQ_F_NEED_CLEANUP;
-
+done:
 	if (ret != sp->len)
 		req_set_fail(req);
 	io_req_complete(req, ret);
@@ -4427,15 +4419,22 @@ static int io_splice_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 static int io_splice(struct io_kiocb *req, unsigned int issue_flags)
 {
 	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;
+	struct file *in;
 	long ret = 0;
 
 	if (issue_flags & IO_URING_F_NONBLOCK)
 		return -EAGAIN;
 
+	in = io_file_get(req->ctx, req, sp->splice_fd_in,
+				  (sp->flags & SPLICE_F_FD_IN_FIXED));
+	if (!in) {
+		ret = -EBADF;
+		goto done;
+	}
+
 	poff_in = (sp->off_in == -1) ? NULL : &sp->off_in;
 	poff_out = (sp->off_out == -1) ? NULL : &sp->off_out;
 
@@ -4444,8 +4443,7 @@ static int io_splice(struct io_kiocb *req, unsigned int issue_flags)
 
 	if (!(sp->flags & SPLICE_F_FD_IN_FIXED))
 		io_put_file(in);
-	req->flags &= ~REQ_F_NEED_CLEANUP;
-
+done:
 	if (ret != sp->len)
 		req_set_fail(req);
 	io_req_complete(req, ret);
@@ -7176,11 +7174,6 @@ static void io_clean_op(struct io_kiocb *req)
 			kfree(io->free_iov);
 			break;
 			}
-		case IORING_OP_SPLICE:
-		case IORING_OP_TEE:
-			if (!(req->splice.flags & SPLICE_F_FD_IN_FIXED))
-				io_put_file(req->splice.file_in);
-			break;
 		case IORING_OP_OPENAT:
 		case IORING_OP_OPENAT2:
 			if (req->open.filename)
-- 
cgit v1.2.3


From 584b0180f0f4d67d7145950fe68c625f06c88b10 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Tue, 29 Mar 2022 10:48:05 -0600
Subject: io_uring: move read/write file prep state into actual opcode handler

In preparation for not necessarily having a file assigned at prep time,
defer any initialization associated with the file to when the opcode
handler is run.

Cc: stable@vger.kernel.org # v5.15+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 101 ++++++++++++++++++++++++++++++----------------------------
 1 file changed, 53 insertions(+), 48 deletions(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 0152ef49cf46..969f65de9972 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -592,7 +592,8 @@ 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;
+	u32				len;
+	u32				flags;
 };
 
 struct io_connect {
@@ -3178,42 +3179,11 @@ static inline bool io_file_supports_nowait(struct io_kiocb *req)
 
 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;
-	struct file *file = req->file;
 	unsigned ioprio;
 	int ret;
 
-	if (!io_req_ffs_set(req))
-		req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT;
-
 	kiocb->ki_pos = READ_ONCE(sqe->off);
-	kiocb->ki_flags = iocb_flags(file);
-	ret = kiocb_set_rw_flags(kiocb, READ_ONCE(sqe->rw_flags));
-	if (unlikely(ret))
-		return ret;
-
-	/*
-	 * If the file is marked O_NONBLOCK, still allow retry for it if it
-	 * supports async. Otherwise it's impossible to use O_NONBLOCK files
-	 * reliably. If not, or it IOCB_NOWAIT is set, don't retry.
-	 */
-	if ((kiocb->ki_flags & IOCB_NOWAIT) ||
-	    ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req)))
-		req->flags |= REQ_F_NOWAIT;
-
-	if (ctx->flags & IORING_SETUP_IOPOLL) {
-		if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll)
-			return -EOPNOTSUPP;
-
-		kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE;
-		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;
-	}
 
 	ioprio = READ_ONCE(sqe->ioprio);
 	if (ioprio) {
@@ -3229,6 +3199,7 @@ static int io_prep_rw(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	req->imu = NULL;
 	req->rw.addr = READ_ONCE(sqe->addr);
 	req->rw.len = READ_ONCE(sqe->len);
+	req->rw.flags = READ_ONCE(sqe->rw_flags);
 	req->buf_index = READ_ONCE(sqe->buf_index);
 	return 0;
 }
@@ -3732,13 +3703,6 @@ static inline int io_rw_prep_async(struct io_kiocb *req, int rw)
 	return 0;
 }
 
-static int io_read_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	if (unlikely(!(req->file->f_mode & FMODE_READ)))
-		return -EBADF;
-	return io_prep_rw(req, sqe);
-}
-
 /*
  * This is our waitqueue callback handler, registered through __folio_lock_async()
  * when we initially tried to do the IO with the iocb armed our waitqueue.
@@ -3826,6 +3790,49 @@ static bool need_read_all(struct io_kiocb *req)
 		S_ISBLK(file_inode(req->file)->i_mode);
 }
 
+static int io_rw_init_file(struct io_kiocb *req, fmode_t mode)
+{
+	struct kiocb *kiocb = &req->rw.kiocb;
+	struct io_ring_ctx *ctx = req->ctx;
+	struct file *file = req->file;
+	int ret;
+
+	if (unlikely(!file || !(file->f_mode & mode)))
+		return -EBADF;
+
+	if (!io_req_ffs_set(req))
+		req->flags |= io_file_get_flags(file) << REQ_F_SUPPORT_NOWAIT_BIT;
+
+	kiocb->ki_flags = iocb_flags(file);
+	ret = kiocb_set_rw_flags(kiocb, req->rw.flags);
+	if (unlikely(ret))
+		return ret;
+
+	/*
+	 * If the file is marked O_NONBLOCK, still allow retry for it if it
+	 * supports async. Otherwise it's impossible to use O_NONBLOCK files
+	 * reliably. If not, or it IOCB_NOWAIT is set, don't retry.
+	 */
+	if ((kiocb->ki_flags & IOCB_NOWAIT) ||
+	    ((file->f_flags & O_NONBLOCK) && !io_file_supports_nowait(req)))
+		req->flags |= REQ_F_NOWAIT;
+
+	if (ctx->flags & IORING_SETUP_IOPOLL) {
+		if (!(kiocb->ki_flags & IOCB_DIRECT) || !file->f_op->iopoll)
+			return -EOPNOTSUPP;
+
+		kiocb->ki_flags |= IOCB_HIPRI | IOCB_ALLOC_CACHE;
+		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;
+	}
+
+	return 0;
+}
+
 static int io_read(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_rw_state __s, *s = &__s;
@@ -3861,6 +3868,9 @@ static int io_read(struct io_kiocb *req, unsigned int issue_flags)
 		iov_iter_restore(&s->iter, &s->iter_state);
 		iovec = NULL;
 	}
+	ret = io_rw_init_file(req, FMODE_READ);
+	if (unlikely(ret))
+		return ret;
 	req->result = iov_iter_count(&s->iter);
 
 	if (force_nonblock) {
@@ -3964,13 +3974,6 @@ out_free:
 	return 0;
 }
 
-static int io_write_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
-{
-	if (unlikely(!(req->file->f_mode & FMODE_WRITE)))
-		return -EBADF;
-	return io_prep_rw(req, sqe);
-}
-
 static int io_write(struct io_kiocb *req, unsigned int issue_flags)
 {
 	struct io_rw_state __s, *s = &__s;
@@ -3991,6 +3994,9 @@ static int io_write(struct io_kiocb *req, unsigned int issue_flags)
 		iov_iter_restore(&s->iter, &s->iter_state);
 		iovec = NULL;
 	}
+	ret = io_rw_init_file(req, FMODE_WRITE);
+	if (unlikely(ret))
+		return ret;
 	req->result = iov_iter_count(&s->iter);
 
 	if (force_nonblock) {
@@ -6987,11 +6993,10 @@ static int io_req_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)
 	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);
+		return io_prep_rw(req, sqe);
 	case IORING_OP_POLL_ADD:
 		return io_poll_add_prep(req, sqe);
 	case IORING_OP_POLL_REMOVE:
-- 
cgit v1.2.3


From 5106dd6e74ab6c94daac1c357094f11e6934b36f Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Mon, 4 Apr 2022 17:18:43 -0600
Subject: io_uring: propagate issue_flags state down to file assignment

We'll need this in a future patch, when we could be assigning the file
after the prep stage. While at it, get rid of the io_file_get() helper,
it just makes the code harder to read.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 82 ++++++++++++++++++++++++++++++++++-------------------------
 1 file changed, 47 insertions(+), 35 deletions(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 969f65de9972..398128db9728 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1183,8 +1183,9 @@ static int __io_register_rsrc_update(struct io_ring_ctx *ctx, unsigned type,
 				     struct io_uring_rsrc_update2 *up,
 				     unsigned nr_args);
 static void io_clean_op(struct io_kiocb *req);
-static struct file *io_file_get(struct io_ring_ctx *ctx,
-				struct io_kiocb *req, int fd, bool fixed);
+static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
+					     unsigned issue_flags);
+static inline struct file *io_file_get_normal(struct io_kiocb *req, int fd);
 static void __io_queue_sqe(struct io_kiocb *req);
 static void io_rsrc_put_work(struct work_struct *work);
 
@@ -1314,13 +1315,20 @@ static void io_rsrc_refs_refill(struct io_ring_ctx *ctx)
 }
 
 static inline void io_req_set_rsrc_node(struct io_kiocb *req,
-					struct io_ring_ctx *ctx)
+					struct io_ring_ctx *ctx,
+					unsigned int issue_flags)
 {
 	if (!req->fixed_rsrc_refs) {
 		req->fixed_rsrc_refs = &ctx->rsrc_node->refs;
-		ctx->rsrc_cached_refs--;
-		if (unlikely(ctx->rsrc_cached_refs < 0))
-			io_rsrc_refs_refill(ctx);
+
+		if (!(issue_flags & IO_URING_F_UNLOCKED)) {
+			lockdep_assert_held(&ctx->uring_lock);
+			ctx->rsrc_cached_refs--;
+			if (unlikely(ctx->rsrc_cached_refs < 0))
+				io_rsrc_refs_refill(ctx);
+		} else {
+			percpu_ref_get(req->fixed_rsrc_refs);
+		}
 	}
 }
 
@@ -3330,7 +3338,8 @@ static int __io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter
 	return 0;
 }
 
-static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter)
+static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter,
+			   unsigned int issue_flags)
 {
 	struct io_mapped_ubuf *imu = req->imu;
 	u16 index, buf_index = req->buf_index;
@@ -3340,7 +3349,7 @@ static int io_import_fixed(struct io_kiocb *req, int rw, struct iov_iter *iter)
 
 		if (unlikely(buf_index >= ctx->nr_user_bufs))
 			return -EFAULT;
-		io_req_set_rsrc_node(req, ctx);
+		io_req_set_rsrc_node(req, ctx, issue_flags);
 		index = array_index_nospec(buf_index, ctx->nr_user_bufs);
 		imu = READ_ONCE(ctx->user_bufs[index]);
 		req->imu = imu;
@@ -3502,7 +3511,7 @@ static struct iovec *__io_import_iovec(int rw, struct io_kiocb *req,
 	ssize_t ret;
 
 	if (opcode == IORING_OP_READ_FIXED || opcode == IORING_OP_WRITE_FIXED) {
-		ret = io_import_fixed(req, rw, iter);
+		ret = io_import_fixed(req, rw, iter, issue_flags);
 		if (ret)
 			return ERR_PTR(ret);
 		return NULL;
@@ -4394,8 +4403,10 @@ static int io_tee(struct io_kiocb *req, unsigned int issue_flags)
 	if (issue_flags & IO_URING_F_NONBLOCK)
 		return -EAGAIN;
 
-	in = io_file_get(req->ctx, req, sp->splice_fd_in,
-				  (sp->flags & SPLICE_F_FD_IN_FIXED));
+	if (sp->flags & SPLICE_F_FD_IN_FIXED)
+		in = io_file_get_fixed(req, sp->splice_fd_in, IO_URING_F_UNLOCKED);
+	else
+		in = io_file_get_normal(req, sp->splice_fd_in);
 	if (!in) {
 		ret = -EBADF;
 		goto done;
@@ -4434,8 +4445,10 @@ static int io_splice(struct io_kiocb *req, unsigned int issue_flags)
 	if (issue_flags & IO_URING_F_NONBLOCK)
 		return -EAGAIN;
 
-	in = io_file_get(req->ctx, req, sp->splice_fd_in,
-				  (sp->flags & SPLICE_F_FD_IN_FIXED));
+	if (sp->flags & SPLICE_F_FD_IN_FIXED)
+		in = io_file_get_fixed(req, sp->splice_fd_in, IO_URING_F_UNLOCKED);
+	else
+		in = io_file_get_normal(req, sp->splice_fd_in);
 	if (!in) {
 		ret = -EBADF;
 		goto done;
@@ -5973,7 +5986,7 @@ static void io_poll_remove_entries(struct io_kiocb *req)
  * either spurious wakeup or multishot CQE is served. 0 when it's done with
  * the request, then the mask is stored in req->result.
  */
-static int io_poll_check_events(struct io_kiocb *req)
+static int io_poll_check_events(struct io_kiocb *req, bool locked)
 {
 	struct io_ring_ctx *ctx = req->ctx;
 	struct io_poll_iocb *poll = io_poll_get_single(req);
@@ -6030,7 +6043,7 @@ static void io_poll_task_func(struct io_kiocb *req, bool *locked)
 	struct io_ring_ctx *ctx = req->ctx;
 	int ret;
 
-	ret = io_poll_check_events(req);
+	ret = io_poll_check_events(req, *locked);
 	if (ret > 0)
 		return;
 
@@ -6055,7 +6068,7 @@ static void io_apoll_task_func(struct io_kiocb *req, bool *locked)
 	struct io_ring_ctx *ctx = req->ctx;
 	int ret;
 
-	ret = io_poll_check_events(req);
+	ret = io_poll_check_events(req, *locked);
 	if (ret > 0)
 		return;
 
@@ -7460,30 +7473,36 @@ static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file
 	file_slot->file_ptr = file_ptr;
 }
 
-static inline struct file *io_file_get_fixed(struct io_ring_ctx *ctx,
-					     struct io_kiocb *req, int fd)
+static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
+					     unsigned int issue_flags)
 {
-	struct file *file;
+	struct io_ring_ctx *ctx = req->ctx;
+	struct file *file = NULL;
 	unsigned long file_ptr;
 
+	if (issue_flags & IO_URING_F_UNLOCKED)
+		mutex_lock(&ctx->uring_lock);
+
 	if (unlikely((unsigned int)fd >= ctx->nr_user_files))
-		return NULL;
+		goto out;
 	fd = array_index_nospec(fd, ctx->nr_user_files);
 	file_ptr = io_fixed_file_slot(&ctx->file_table, fd)->file_ptr;
 	file = (struct file *) (file_ptr & FFS_MASK);
 	file_ptr &= ~FFS_MASK;
 	/* mask in overlapping REQ_F and FFS bits */
 	req->flags |= (file_ptr << REQ_F_SUPPORT_NOWAIT_BIT);
-	io_req_set_rsrc_node(req, ctx);
+	io_req_set_rsrc_node(req, ctx, 0);
+out:
+	if (issue_flags & IO_URING_F_UNLOCKED)
+		mutex_unlock(&ctx->uring_lock);
 	return file;
 }
 
-static struct file *io_file_get_normal(struct io_ring_ctx *ctx,
-				       struct io_kiocb *req, int fd)
+static struct file *io_file_get_normal(struct io_kiocb *req, int fd)
 {
 	struct file *file = fget(fd);
 
-	trace_io_uring_file_get(ctx, req, req->user_data, fd);
+	trace_io_uring_file_get(req->ctx, req, req->user_data, fd);
 
 	/* we don't allow fixed io_uring files */
 	if (file && unlikely(file->f_op == &io_uring_fops))
@@ -7491,15 +7510,6 @@ static struct file *io_file_get_normal(struct io_ring_ctx *ctx,
 	return file;
 }
 
-static inline struct file *io_file_get(struct io_ring_ctx *ctx,
-				       struct io_kiocb *req, int fd, bool fixed)
-{
-	if (fixed)
-		return io_file_get_fixed(ctx, req, fd);
-	else
-		return io_file_get_normal(ctx, req, fd);
-}
-
 static void io_req_task_link_timeout(struct io_kiocb *req, bool *locked)
 {
 	struct io_kiocb *prev = req->timeout.prev;
@@ -7749,8 +7759,10 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
 			blk_start_plug_nr_ios(&state->plug, state->submit_nr);
 		}
 
-		req->file = io_file_get(ctx, req, READ_ONCE(sqe->fd),
-					(sqe_flags & IOSQE_FIXED_FILE));
+		if (req->flags & REQ_F_FIXED_FILE)
+			req->file = io_file_get_fixed(req, READ_ONCE(sqe->fd), 0);
+		else
+			req->file = io_file_get_normal(req, READ_ONCE(sqe->fd));
 		if (unlikely(!req->file))
 			return -EBADF;
 	}
-- 
cgit v1.2.3


From 6bf9c47a398911e0ab920e362115153596c80432 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Tue, 29 Mar 2022 10:10:08 -0600
Subject: io_uring: defer file assignment

If an application uses direct open or accept, it knows in advance what
direct descriptor value it will get as it picks it itself. This allows
combined requests such as:

sqe = io_uring_get_sqe(ring);
io_uring_prep_openat_direct(sqe, ..., file_slot);
sqe->flags |= IOSQE_IO_LINK | IOSQE_CQE_SKIP_SUCCESS;

sqe = io_uring_get_sqe(ring);
io_uring_prep_read(sqe,file_slot, buf, buf_size, 0);
sqe->flags |= IOSQE_FIXED_FILE;

io_uring_submit(ring);

where we prepare both a file open and read, and only get a completion
event for the read when both have completed successfully.

Currently links are fully prepared before the head is issued, but that
fails if the dependent link needs a file assigned that isn't valid until
the head has completed.

Conversely, if the same chain is performed but the fixed file slot is
already valid, then we would be unexpectedly returning data from the
old file slot rather than the newly opened one. Make sure we're
consistent here.

Allow deferral of file setup, which makes this documented case work.

Cc: stable@vger.kernel.org # v5.15+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io-wq.h    |  1 +
 fs/io_uring.c | 39 +++++++++++++++++++++++++++++----------
 2 files changed, 30 insertions(+), 10 deletions(-)

(limited to 'fs')

diff --git a/fs/io-wq.h b/fs/io-wq.h
index dbecd27656c7..04d374e65e54 100644
--- a/fs/io-wq.h
+++ b/fs/io-wq.h
@@ -155,6 +155,7 @@ struct io_wq_work_node *wq_stack_extract(struct io_wq_work_node *stack)
 struct io_wq_work {
 	struct io_wq_work_node list;
 	unsigned flags;
+	int fd;
 };
 
 static inline struct io_wq_work *wq_next_work(struct io_wq_work *work)
diff --git a/fs/io_uring.c b/fs/io_uring.c
index 398128db9728..bdc090fec29c 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -7240,6 +7240,23 @@ static void io_clean_op(struct io_kiocb *req)
 	req->flags &= ~IO_REQ_CLEAN_FLAGS;
 }
 
+static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags)
+{
+	if (req->file || !io_op_defs[req->opcode].needs_file)
+		return true;
+
+	if (req->flags & REQ_F_FIXED_FILE)
+		req->file = io_file_get_fixed(req, req->work.fd, issue_flags);
+	else
+		req->file = io_file_get_normal(req, req->work.fd);
+	if (req->file)
+		return true;
+
+	req_set_fail(req);
+	req->result = -EBADF;
+	return false;
+}
+
 static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
 {
 	const struct cred *creds = NULL;
@@ -7250,6 +7267,8 @@ static int io_issue_sqe(struct io_kiocb *req, unsigned int issue_flags)
 
 	if (!io_op_defs[req->opcode].audit_skip)
 		audit_uring_entry(req->opcode);
+	if (unlikely(!io_assign_file(req, issue_flags)))
+		return -EBADF;
 
 	switch (req->opcode) {
 	case IORING_OP_NOP:
@@ -7394,10 +7413,11 @@ static struct io_wq_work *io_wq_free_work(struct io_wq_work *work)
 static void io_wq_submit_work(struct io_wq_work *work)
 {
 	struct io_kiocb *req = container_of(work, struct io_kiocb, work);
+	const struct io_op_def *def = &io_op_defs[req->opcode];
 	unsigned int issue_flags = IO_URING_F_UNLOCKED;
 	bool needs_poll = false;
 	struct io_kiocb *timeout;
-	int ret = 0;
+	int ret = 0, err = -ECANCELED;
 
 	/* one will be dropped by ->io_free_work() after returning to io-wq */
 	if (!(req->flags & REQ_F_REFCOUNT))
@@ -7409,14 +7429,18 @@ static void io_wq_submit_work(struct io_wq_work *work)
 	if (timeout)
 		io_queue_linked_timeout(timeout);
 
+	if (!io_assign_file(req, issue_flags)) {
+		err = -EBADF;
+		work->flags |= IO_WQ_WORK_CANCEL;
+	}
+
 	/* either cancelled or io-wq is dying, so don't touch tctx->iowq */
 	if (work->flags & IO_WQ_WORK_CANCEL) {
-		io_req_task_queue_fail(req, -ECANCELED);
+		io_req_task_queue_fail(req, err);
 		return;
 	}
 
 	if (req->flags & REQ_F_FORCE_ASYNC) {
-		const struct io_op_def *def = &io_op_defs[req->opcode];
 		bool opcode_poll = def->pollin || def->pollout;
 
 		if (opcode_poll && file_can_poll(req->file)) {
@@ -7749,6 +7773,8 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
 	if (io_op_defs[opcode].needs_file) {
 		struct io_submit_state *state = &ctx->submit_state;
 
+		req->work.fd = READ_ONCE(sqe->fd);
+
 		/*
 		 * Plug now if we have more than 2 IO left after this, and the
 		 * target is potentially a read/write to block based storage.
@@ -7758,13 +7784,6 @@ static int io_init_req(struct io_ring_ctx *ctx, struct io_kiocb *req,
 			state->need_plug = false;
 			blk_start_plug_nr_ios(&state->plug, state->submit_nr);
 		}
-
-		if (req->flags & REQ_F_FIXED_FILE)
-			req->file = io_file_get_fixed(req, READ_ONCE(sqe->fd), 0);
-		else
-			req->file = io_file_get_normal(req, READ_ONCE(sqe->fd));
-		if (unlikely(!req->file))
-			return -EBADF;
 	}
 
 	personality = READ_ONCE(sqe->personality);
-- 
cgit v1.2.3


From d5361233e9ab920e135819f73dd8466355f1fddd Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Thu, 31 Mar 2022 12:38:46 -0600
Subject: io_uring: drop the old style inflight file tracking

io_uring tracks requests that are referencing an io_uring descriptor to
be able to cancel without worrying about loops in the references. Since
we now assign the file at execution time, the easier approach is to drop
a potentially problematic reference before we punt the request. This
eliminates the need to special case these types of files beyond just
marking them as such, and simplifies cancelation quite a bit.

This also fixes a recent issue where an async punted tee operation would
with the io_uring descriptor as the output file would crash when
attempting to get a reference to the file from the io-wq worker. We
could have worked around that, but this is the much cleaner fix.

Fixes: 6bf9c47a3989 ("io_uring: defer file assignment")
Reported-by: syzbot+c4b9303500a21750b250@syzkaller.appspotmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 85 +++++++++++++++++++----------------------------------------
 1 file changed, 27 insertions(+), 58 deletions(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index bdc090fec29c..ad0d99ffbf0a 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -112,8 +112,7 @@
 			IOSQE_IO_DRAIN | IOSQE_CQE_SKIP_SUCCESS)
 
 #define IO_REQ_CLEAN_FLAGS (REQ_F_BUFFER_SELECTED | REQ_F_NEED_CLEANUP | \
-				REQ_F_POLLED | REQ_F_INFLIGHT | REQ_F_CREDS | \
-				REQ_F_ASYNC_DATA)
+				REQ_F_POLLED | REQ_F_CREDS | REQ_F_ASYNC_DATA)
 
 #define IO_TCTX_REFS_CACHE_NR	(1U << 10)
 
@@ -500,7 +499,6 @@ struct io_uring_task {
 	const struct io_ring_ctx *last;
 	struct io_wq		*io_wq;
 	struct percpu_counter	inflight;
-	atomic_t		inflight_tracked;
 	atomic_t		in_idle;
 
 	spinlock_t		task_lock;
@@ -1186,6 +1184,8 @@ static void io_clean_op(struct io_kiocb *req);
 static inline struct file *io_file_get_fixed(struct io_kiocb *req, int fd,
 					     unsigned issue_flags);
 static inline struct file *io_file_get_normal(struct io_kiocb *req, int fd);
+static void io_drop_inflight_file(struct io_kiocb *req);
+static bool io_assign_file(struct io_kiocb *req, unsigned int issue_flags);
 static void __io_queue_sqe(struct io_kiocb *req);
 static void io_rsrc_put_work(struct work_struct *work);
 
@@ -1433,29 +1433,9 @@ static bool io_match_task(struct io_kiocb *head, struct task_struct *task,
 			  bool cancel_all)
 	__must_hold(&req->ctx->timeout_lock)
 {
-	struct io_kiocb *req;
-
 	if (task && head->task != task)
 		return false;
-	if (cancel_all)
-		return true;
-
-	io_for_each_link(req, head) {
-		if (req->flags & REQ_F_INFLIGHT)
-			return true;
-	}
-	return false;
-}
-
-static bool io_match_linked(struct io_kiocb *head)
-{
-	struct io_kiocb *req;
-
-	io_for_each_link(req, head) {
-		if (req->flags & REQ_F_INFLIGHT)
-			return true;
-	}
-	return false;
+	return cancel_all;
 }
 
 /*
@@ -1465,24 +1445,9 @@ static bool io_match_linked(struct io_kiocb *head)
 static bool io_match_task_safe(struct io_kiocb *head, struct task_struct *task,
 			       bool cancel_all)
 {
-	bool matched;
-
 	if (task && head->task != task)
 		return false;
-	if (cancel_all)
-		return true;
-
-	if (head->flags & REQ_F_LINK_TIMEOUT) {
-		struct io_ring_ctx *ctx = head->ctx;
-
-		/* protect against races with linked timeouts */
-		spin_lock_irq(&ctx->timeout_lock);
-		matched = io_match_linked(head);
-		spin_unlock_irq(&ctx->timeout_lock);
-	} else {
-		matched = io_match_linked(head);
-	}
-	return matched;
+	return cancel_all;
 }
 
 static inline bool req_has_async_data(struct io_kiocb *req)
@@ -1645,14 +1610,6 @@ static inline bool io_req_ffs_set(struct io_kiocb *req)
 	return req->flags & REQ_F_FIXED_FILE;
 }
 
-static inline void io_req_track_inflight(struct io_kiocb *req)
-{
-	if (!(req->flags & REQ_F_INFLIGHT)) {
-		req->flags |= REQ_F_INFLIGHT;
-		atomic_inc(&current->io_uring->inflight_tracked);
-	}
-}
-
 static struct io_kiocb *__io_prep_linked_timeout(struct io_kiocb *req)
 {
 	if (WARN_ON_ONCE(!req->link))
@@ -2563,6 +2520,8 @@ static void io_req_task_work_add(struct io_kiocb *req, bool priority)
 
 	WARN_ON_ONCE(!tctx);
 
+	io_drop_inflight_file(req);
+
 	spin_lock_irqsave(&tctx->task_lock, flags);
 	if (priority)
 		wq_list_add_tail(&req->io_task_work.node, &tctx->prior_task_list);
@@ -6008,7 +5967,10 @@ static int io_poll_check_events(struct io_kiocb *req, bool locked)
 		if (!req->result) {
 			struct poll_table_struct pt = { ._key = req->cflags };
 
-			req->result = vfs_poll(req->file, &pt) & req->cflags;
+			if (unlikely(!io_assign_file(req, IO_URING_F_UNLOCKED)))
+				req->result = -EBADF;
+			else
+				req->result = vfs_poll(req->file, &pt) & req->cflags;
 		}
 
 		/* multishot, just fill an CQE and proceed */
@@ -7226,11 +7188,6 @@ static void io_clean_op(struct io_kiocb *req)
 		kfree(req->apoll);
 		req->apoll = NULL;
 	}
-	if (req->flags & REQ_F_INFLIGHT) {
-		struct io_uring_task *tctx = req->task->io_uring;
-
-		atomic_dec(&tctx->inflight_tracked);
-	}
 	if (req->flags & REQ_F_CREDS)
 		put_cred(req->creds);
 	if (req->flags & REQ_F_ASYNC_DATA) {
@@ -7522,6 +7479,19 @@ out:
 	return file;
 }
 
+/*
+ * Drop the file for requeue operations. Only used of req->file is the
+ * io_uring descriptor itself.
+ */
+static void io_drop_inflight_file(struct io_kiocb *req)
+{
+	if (unlikely(req->flags & REQ_F_INFLIGHT)) {
+		fput(req->file);
+		req->file = NULL;
+		req->flags &= ~REQ_F_INFLIGHT;
+	}
+}
+
 static struct file *io_file_get_normal(struct io_kiocb *req, int fd)
 {
 	struct file *file = fget(fd);
@@ -7529,8 +7499,8 @@ static struct file *io_file_get_normal(struct io_kiocb *req, int fd)
 	trace_io_uring_file_get(req->ctx, req, req->user_data, fd);
 
 	/* we don't allow fixed io_uring files */
-	if (file && unlikely(file->f_op == &io_uring_fops))
-		io_req_track_inflight(req);
+	if (file && file->f_op == &io_uring_fops)
+		req->flags |= REQ_F_INFLIGHT;
 	return file;
 }
 
@@ -9437,7 +9407,6 @@ static __cold int io_uring_alloc_task_context(struct task_struct *task,
 	xa_init(&tctx->xa);
 	init_waitqueue_head(&tctx->wait);
 	atomic_set(&tctx->in_idle, 0);
-	atomic_set(&tctx->inflight_tracked, 0);
 	task->io_uring = tctx;
 	spin_lock_init(&tctx->task_lock);
 	INIT_WQ_LIST(&tctx->task_list);
@@ -10630,7 +10599,7 @@ static __cold void io_uring_clean_tctx(struct io_uring_task *tctx)
 static s64 tctx_inflight(struct io_uring_task *tctx, bool tracked)
 {
 	if (tracked)
-		return atomic_read(&tctx->inflight_tracked);
+		return 0;
 	return percpu_counter_sum(&tctx->inflight);
 }
 
-- 
cgit v1.2.3


From cb318216732579da80202fe3e622a504e55b3a0f Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Tue, 5 Apr 2022 10:31:43 -0600
Subject: Revert "io_uring: Add support for napi_busy_poll"

This reverts commit adc8682ec69012b68d5ab7123e246d2ad9a6f94b.

There's some discussion on the API not being as good as it can be.
Rather than ship something and be stuck with it forever, let's revert
the NAPI support for now and work on getting something sorted out
for the next kernel release instead.

Link: https://lore.kernel.org/io-uring/b7bbc124-8502-0ee9-d4c8-7c41b4487264@kernel.dk/
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 232 +---------------------------------------------------------
 1 file changed, 1 insertion(+), 231 deletions(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index ad0d99ffbf0a..60d6ac21519d 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -63,7 +63,6 @@
 #include <net/sock.h>
 #include <net/af_unix.h>
 #include <net/scm.h>
-#include <net/busy_poll.h>
 #include <linux/anon_inodes.h>
 #include <linux/sched/mm.h>
 #include <linux/uaccess.h>
@@ -411,11 +410,6 @@ struct io_ring_ctx {
 	struct list_head	sqd_list;
 
 	unsigned long		check_cq_overflow;
-#ifdef CONFIG_NET_RX_BUSY_POLL
-	/* used to track busy poll napi_id */
-	struct list_head	napi_list;
-	spinlock_t		napi_lock;	/* napi_list lock */
-#endif
 
 	struct {
 		unsigned		cached_cq_tail;
@@ -1569,10 +1563,6 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 	INIT_WQ_LIST(&ctx->locked_free_list);
 	INIT_DELAYED_WORK(&ctx->fallback_work, io_fallback_req_func);
 	INIT_WQ_LIST(&ctx->submit_state.compl_reqs);
-#ifdef CONFIG_NET_RX_BUSY_POLL
-	INIT_LIST_HEAD(&ctx->napi_list);
-	spin_lock_init(&ctx->napi_lock);
-#endif
 	return ctx;
 err:
 	kfree(ctx->dummy_ubuf);
@@ -5730,108 +5720,6 @@ IO_NETOP_FN(send);
 IO_NETOP_FN(recv);
 #endif /* CONFIG_NET */
 
-#ifdef CONFIG_NET_RX_BUSY_POLL
-
-#define NAPI_TIMEOUT			(60 * SEC_CONVERSION)
-
-struct napi_entry {
-	struct list_head	list;
-	unsigned int		napi_id;
-	unsigned long		timeout;
-};
-
-/*
- * Add busy poll NAPI ID from sk.
- */
-static void io_add_napi(struct file *file, struct io_ring_ctx *ctx)
-{
-	unsigned int napi_id;
-	struct socket *sock;
-	struct sock *sk;
-	struct napi_entry *ne;
-
-	if (!net_busy_loop_on())
-		return;
-
-	sock = sock_from_file(file);
-	if (!sock)
-		return;
-
-	sk = sock->sk;
-	if (!sk)
-		return;
-
-	napi_id = READ_ONCE(sk->sk_napi_id);
-
-	/* Non-NAPI IDs can be rejected */
-	if (napi_id < MIN_NAPI_ID)
-		return;
-
-	spin_lock(&ctx->napi_lock);
-	list_for_each_entry(ne, &ctx->napi_list, list) {
-		if (ne->napi_id == napi_id) {
-			ne->timeout = jiffies + NAPI_TIMEOUT;
-			goto out;
-		}
-	}
-
-	ne = kmalloc(sizeof(*ne), GFP_NOWAIT);
-	if (!ne)
-		goto out;
-
-	ne->napi_id = napi_id;
-	ne->timeout = jiffies + NAPI_TIMEOUT;
-	list_add_tail(&ne->list, &ctx->napi_list);
-out:
-	spin_unlock(&ctx->napi_lock);
-}
-
-static inline void io_check_napi_entry_timeout(struct napi_entry *ne)
-{
-	if (time_after(jiffies, ne->timeout)) {
-		list_del(&ne->list);
-		kfree(ne);
-	}
-}
-
-/*
- * Busy poll if globally on and supporting sockets found
- */
-static bool io_napi_busy_loop(struct list_head *napi_list)
-{
-	struct napi_entry *ne, *n;
-
-	list_for_each_entry_safe(ne, n, napi_list, list) {
-		napi_busy_loop(ne->napi_id, NULL, NULL, true,
-			       BUSY_POLL_BUDGET);
-		io_check_napi_entry_timeout(ne);
-	}
-	return !list_empty(napi_list);
-}
-
-static void io_free_napi_list(struct io_ring_ctx *ctx)
-{
-	spin_lock(&ctx->napi_lock);
-	while (!list_empty(&ctx->napi_list)) {
-		struct napi_entry *ne =
-			list_first_entry(&ctx->napi_list, struct napi_entry,
-					 list);
-
-		list_del(&ne->list);
-		kfree(ne);
-	}
-	spin_unlock(&ctx->napi_lock);
-}
-#else
-static inline void io_add_napi(struct file *file, struct io_ring_ctx *ctx)
-{
-}
-
-static inline void io_free_napi_list(struct io_ring_ctx *ctx)
-{
-}
-#endif /* CONFIG_NET_RX_BUSY_POLL */
-
 struct io_poll_table {
 	struct poll_table_struct pt;
 	struct io_kiocb *req;
@@ -5986,7 +5874,6 @@ static int io_poll_check_events(struct io_kiocb *req, bool locked)
 			if (unlikely(!filled))
 				return -ECANCELED;
 			io_cqring_ev_posted(ctx);
-			io_add_napi(req->file, ctx);
 		} else if (req->result) {
 			return 0;
 		}
@@ -6237,7 +6124,6 @@ static int __io_arm_poll_handler(struct io_kiocb *req,
 		__io_poll_execute(req, mask, poll->events);
 		return 0;
 	}
-	io_add_napi(req->file, req->ctx);
 
 	/*
 	 * Release ownership. If someone tried to queue a tw while it was
@@ -8028,13 +7914,7 @@ static int __io_sq_thread(struct io_ring_ctx *ctx, bool cap_entries)
 		    !(ctx->flags & IORING_SETUP_R_DISABLED))
 			ret = io_submit_sqes(ctx, to_submit);
 		mutex_unlock(&ctx->uring_lock);
-#ifdef CONFIG_NET_RX_BUSY_POLL
-		spin_lock(&ctx->napi_lock);
-		if (!list_empty(&ctx->napi_list) &&
-		    io_napi_busy_loop(&ctx->napi_list))
-			++ret;
-		spin_unlock(&ctx->napi_lock);
-#endif
+
 		if (to_submit && wq_has_sleeper(&ctx->sqo_sq_wait))
 			wake_up(&ctx->sqo_sq_wait);
 		if (creds)
@@ -8172,9 +8052,6 @@ struct io_wait_queue {
 	struct io_ring_ctx *ctx;
 	unsigned cq_tail;
 	unsigned nr_timeouts;
-#ifdef CONFIG_NET_RX_BUSY_POLL
-	unsigned busy_poll_to;
-#endif
 };
 
 static inline bool io_should_wake(struct io_wait_queue *iowq)
@@ -8236,87 +8113,6 @@ static inline int io_cqring_wait_schedule(struct io_ring_ctx *ctx,
 	return 1;
 }
 
-#ifdef CONFIG_NET_RX_BUSY_POLL
-static void io_adjust_busy_loop_timeout(struct timespec64 *ts,
-					struct io_wait_queue *iowq)
-{
-	unsigned busy_poll_to = READ_ONCE(sysctl_net_busy_poll);
-	struct timespec64 pollto = ns_to_timespec64(1000 * (s64)busy_poll_to);
-
-	if (timespec64_compare(ts, &pollto) > 0) {
-		*ts = timespec64_sub(*ts, pollto);
-		iowq->busy_poll_to = busy_poll_to;
-	} else {
-		u64 to = timespec64_to_ns(ts);
-
-		do_div(to, 1000);
-		iowq->busy_poll_to = to;
-		ts->tv_sec = 0;
-		ts->tv_nsec = 0;
-	}
-}
-
-static inline bool io_busy_loop_timeout(unsigned long start_time,
-					unsigned long bp_usec)
-{
-	if (bp_usec) {
-		unsigned long end_time = start_time + bp_usec;
-		unsigned long now = busy_loop_current_time();
-
-		return time_after(now, end_time);
-	}
-	return true;
-}
-
-static bool io_busy_loop_end(void *p, unsigned long start_time)
-{
-	struct io_wait_queue *iowq = p;
-
-	return signal_pending(current) ||
-	       io_should_wake(iowq) ||
-	       io_busy_loop_timeout(start_time, iowq->busy_poll_to);
-}
-
-static void io_blocking_napi_busy_loop(struct list_head *napi_list,
-				       struct io_wait_queue *iowq)
-{
-	unsigned long start_time =
-		list_is_singular(napi_list) ? 0 :
-		busy_loop_current_time();
-
-	do {
-		if (list_is_singular(napi_list)) {
-			struct napi_entry *ne =
-				list_first_entry(napi_list,
-						 struct napi_entry, list);
-
-			napi_busy_loop(ne->napi_id, io_busy_loop_end, iowq,
-				       true, BUSY_POLL_BUDGET);
-			io_check_napi_entry_timeout(ne);
-			break;
-		}
-	} while (io_napi_busy_loop(napi_list) &&
-		 !io_busy_loop_end(iowq, start_time));
-}
-
-static void io_putback_napi_list(struct io_ring_ctx *ctx,
-				 struct list_head *napi_list)
-{
-	struct napi_entry *cne, *lne;
-
-	spin_lock(&ctx->napi_lock);
-	list_for_each_entry(cne, &ctx->napi_list, list)
-		list_for_each_entry(lne, napi_list, list)
-			if (cne->napi_id == lne->napi_id) {
-				list_del(&lne->list);
-				kfree(lne);
-				break;
-			}
-	list_splice(napi_list, &ctx->napi_list);
-	spin_unlock(&ctx->napi_lock);
-}
-#endif /* CONFIG_NET_RX_BUSY_POLL */
-
 /*
  * 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.
@@ -8329,9 +8125,6 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
 	struct io_rings *rings = ctx->rings;
 	ktime_t timeout = KTIME_MAX;
 	int ret;
-#ifdef CONFIG_NET_RX_BUSY_POLL
-	LIST_HEAD(local_napi_list);
-#endif
 
 	do {
 		io_cqring_overflow_flush(ctx);
@@ -8354,29 +8147,13 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
 			return ret;
 	}
 
-#ifdef CONFIG_NET_RX_BUSY_POLL
-	iowq.busy_poll_to = 0;
-	if (!(ctx->flags & IORING_SETUP_SQPOLL)) {
-		spin_lock(&ctx->napi_lock);
-		list_splice_init(&ctx->napi_list, &local_napi_list);
-		spin_unlock(&ctx->napi_lock);
-	}
-#endif
 	if (uts) {
 		struct timespec64 ts;
 
 		if (get_timespec64(&ts, uts))
 			return -EFAULT;
-#ifdef CONFIG_NET_RX_BUSY_POLL
-		if (!list_empty(&local_napi_list))
-			io_adjust_busy_loop_timeout(&ts, &iowq);
-#endif
 		timeout = ktime_add_ns(timespec64_to_ktime(ts), ktime_get_ns());
 	}
-#ifdef CONFIG_NET_RX_BUSY_POLL
-	else if (!list_empty(&local_napi_list))
-		iowq.busy_poll_to = READ_ONCE(sysctl_net_busy_poll);
-#endif
 
 	init_waitqueue_func_entry(&iowq.wq, io_wake_function);
 	iowq.wq.private = current;
@@ -8386,12 +8163,6 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
 	iowq.cq_tail = READ_ONCE(ctx->rings->cq.head) + min_events;
 
 	trace_io_uring_cqring_wait(ctx, min_events);
-#ifdef CONFIG_NET_RX_BUSY_POLL
-	if (iowq.busy_poll_to)
-		io_blocking_napi_busy_loop(&local_napi_list, &iowq);
-	if (!list_empty(&local_napi_list))
-		io_putback_napi_list(ctx, &local_napi_list);
-#endif
 	do {
 		/* if we can't even flush overflow, don't wait for more */
 		if (!io_cqring_overflow_flush(ctx)) {
@@ -10176,7 +9947,6 @@ static __cold void io_ring_ctx_free(struct io_ring_ctx *ctx)
 	io_req_caches_free(ctx);
 	if (ctx->hash_map)
 		io_wq_put_hash(ctx->hash_map);
-	io_free_napi_list(ctx);
 	kfree(ctx->cancel_hash);
 	kfree(ctx->dummy_ubuf);
 	kfree(ctx->io_buffers);
-- 
cgit v1.2.3


From 0f5e4b83b37a96e3643951588ed7176b9b187c0a Mon Sep 17 00:00:00 2001
From: Eugene Syromiatnikov <esyr@redhat.com>
Date: Wed, 6 Apr 2022 13:55:33 +0200
Subject: io_uring: implement compat handling for IORING_REGISTER_IOWQ_AFF

Similarly to the way it is done im mbind syscall.

Cc: stable@vger.kernel.org # 5.14
Fixes: fe76421d1da1dcdb ("io_uring: allow user configurable IO thread CPU affinity")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 60d6ac21519d..a88eca3e0902 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -11472,7 +11472,15 @@ static __cold int io_register_iowq_aff(struct io_ring_ctx *ctx,
 	if (len > cpumask_size())
 		len = cpumask_size();
 
-	if (copy_from_user(new_mask, arg, len)) {
+	if (in_compat_syscall()) {
+		ret = compat_get_bitmap(cpumask_bits(new_mask),
+					(const compat_ulong_t __user *)arg,
+					len * 8 /* CHAR_BIT */);
+	} else {
+		ret = copy_from_user(new_mask, arg, len);
+	}
+
+	if (ret) {
 		free_cpumask_var(new_mask);
 		return -EFAULT;
 	}
-- 
cgit v1.2.3


From 34bb77184123ae401100a4d156584f12fa630e5c Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Wed, 6 Apr 2022 12:43:57 +0100
Subject: io_uring: nospec index for tags on files update

Don't forget to array_index_nospec() for indexes before updating rsrc
tags in __io_sqe_files_update(), just use already safe and precalculated
index @i.

Fixes: c3bdad0271834 ("io_uring: add generic rsrc update with tags")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index a88eca3e0902..b517fd9c3f60 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9094,7 +9094,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
 				err = -EBADF;
 				break;
 			}
-			*io_get_tag_slot(data, up->offset + done) = tag;
+			*io_get_tag_slot(data, i) = tag;
 			io_fixed_file_set(file_slot, file);
 			err = io_sqe_file_register(ctx, file, i);
 			if (err) {
-- 
cgit v1.2.3


From a07211e3001435fe8591b992464cd8d5e3c98c5a Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Wed, 6 Apr 2022 12:43:58 +0100
Subject: io_uring: don't touch scm_fp_list after queueing skb

It's safer to not touch scm_fp_list after we queued an skb to which it
was assigned, there might be races lurking if we screw subtle sync
guarantees on the io_uring side.

Fixes: 6b06314c47e14 ("io_uring: add file set registration")
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index b517fd9c3f60..7e672464dcb3 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8631,8 +8631,12 @@ static int __io_sqe_files_scm(struct io_ring_ctx *ctx, int nr, int offset)
 		refcount_add(skb->truesize, &sk->sk_wmem_alloc);
 		skb_queue_head(&sk->sk_receive_queue, skb);
 
-		for (i = 0; i < nr_files; i++)
-			fput(fpl->fp[i]);
+		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);
-- 
cgit v1.2.3


From 8f0a24801bb44aa58496945aabb904c729176772 Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Thu, 7 Apr 2022 14:05:04 +0100
Subject: io_uring: zero tag on rsrc removal

Automatically default rsrc tag in io_queue_rsrc_removal(), it's safer
than leaving it there and relying on the rest of the code to behave and
not use it.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1cf262a50df17478ea25b22494dcc19f3a80301f.1649336342.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index 7e672464dcb3..d62079e9096c 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -8927,13 +8927,15 @@ static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file,
 static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
 				 struct io_rsrc_node *node, void *rsrc)
 {
+	u64 *tag_slot = io_get_tag_slot(data, idx);
 	struct io_rsrc_put *prsrc;
 
 	prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL);
 	if (!prsrc)
 		return -ENOMEM;
 
-	prsrc->tag = *io_get_tag_slot(data, idx);
+	prsrc->tag = *tag_slot;
+	*tag_slot = 0;
 	prsrc->rsrc = rsrc;
 	list_add(&prsrc->list, &node->rsrc_list);
 	return 0;
-- 
cgit v1.2.3


From 4cdd158be9d09223737df83136a1fb65269d809a Mon Sep 17 00:00:00 2001
From: Pavel Begunkov <asml.silence@gmail.com>
Date: Thu, 7 Apr 2022 14:05:05 +0100
Subject: io_uring: use nospec annotation for more indexes

There are still several places that using pre array_index_nospec()
indexes, fix them up.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/b01ef5ee83f72ed35ad525912370b729f5d145f4.1649336342.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 11 +++++------
 1 file changed, 5 insertions(+), 6 deletions(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index d62079e9096c..fafd1ca4780b 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -9004,7 +9004,7 @@ static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags)
 	bool needs_lock = issue_flags & IO_URING_F_UNLOCKED;
 	struct io_fixed_file *file_slot;
 	struct file *file;
-	int ret, i;
+	int ret;
 
 	io_ring_submit_lock(ctx, needs_lock);
 	ret = -ENXIO;
@@ -9017,8 +9017,8 @@ static int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags)
 	if (ret)
 		goto out;
 
-	i = array_index_nospec(offset, ctx->nr_user_files);
-	file_slot = io_fixed_file_slot(&ctx->file_table, i);
+	offset = array_index_nospec(offset, ctx->nr_user_files);
+	file_slot = io_fixed_file_slot(&ctx->file_table, offset);
 	ret = -EBADF;
 	if (!file_slot->file_ptr)
 		goto out;
@@ -9074,8 +9074,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
 
 		if (file_slot->file_ptr) {
 			file = (struct file *)(file_slot->file_ptr & FFS_MASK);
-			err = io_queue_rsrc_removal(data, up->offset + done,
-						    ctx->rsrc_node, file);
+			err = io_queue_rsrc_removal(data, i, ctx->rsrc_node, file);
 			if (err)
 				break;
 			file_slot->file_ptr = 0;
@@ -9758,7 +9757,7 @@ static int __io_sqe_buffers_update(struct io_ring_ctx *ctx,
 
 		i = array_index_nospec(offset, ctx->nr_user_bufs);
 		if (ctx->user_bufs[i] != ctx->dummy_ubuf) {
-			err = io_queue_rsrc_removal(ctx->buf_data, offset,
+			err = io_queue_rsrc_removal(ctx->buf_data, i,
 						    ctx->rsrc_node, ctx->user_bufs[i]);
 			if (unlikely(err)) {
 				io_buffer_unmap(ctx, &imu);
-- 
cgit v1.2.3


From e677edbcabee849bfdd43f1602bccbecf736a646 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Fri, 8 Apr 2022 11:08:58 -0600
Subject: io_uring: fix race between timeout flush and removal

io_flush_timeouts() assumes the timeout isn't in progress of triggering
or being removed/canceled, so it unconditionally removes it from the
timeout list and attempts to cancel it.

Leave it on the list and let the normal timeout cancelation take care
of it.

Cc: stable@vger.kernel.org # 5.5+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
 fs/io_uring.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

(limited to 'fs')

diff --git a/fs/io_uring.c b/fs/io_uring.c
index fafd1ca4780b..659f8ecba5b7 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -1736,12 +1736,11 @@ static __cold void io_flush_timeouts(struct io_ring_ctx *ctx)
 	__must_hold(&ctx->completion_lock)
 {
 	u32 seq = ctx->cached_cq_tail - atomic_read(&ctx->cq_timeouts);
+	struct io_kiocb *req, *tmp;
 
 	spin_lock_irq(&ctx->timeout_lock);
-	while (!list_empty(&ctx->timeout_list)) {
+	list_for_each_entry_safe(req, tmp, &ctx->timeout_list, timeout.list) {
 		u32 events_needed, events_got;
-		struct io_kiocb *req = list_first_entry(&ctx->timeout_list,
-						struct io_kiocb, timeout.list);
 
 		if (io_is_timeout_noseq(req))
 			break;
@@ -1758,7 +1757,6 @@ static __cold void io_flush_timeouts(struct io_ring_ctx *ctx)
 		if (events_got < events_needed)
 			break;
 
-		list_del_init(&req->timeout.list);
 		io_kill_timeout(req, 0);
 	}
 	ctx->cq_last_tm_flush = seq;
@@ -6628,6 +6626,7 @@ static int io_timeout_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe,
 	if (data->ts.tv_sec < 0 || data->ts.tv_nsec < 0)
 		return -EINVAL;
 
+	INIT_LIST_HEAD(&req->timeout.list);
 	data->mode = io_translate_timeout_mode(flags);
 	hrtimer_init(&data->timer, io_timeout_get_clock(data), data->mode);
 
-- 
cgit v1.2.3