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-rw-r--r--fs/fscache/operation.c633
1 files changed, 0 insertions, 633 deletions
diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
deleted file mode 100644
index e002cdfaf3cc..000000000000
--- a/fs/fscache/operation.c
+++ /dev/null
@@ -1,633 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* FS-Cache worker operation management routines
- *
- * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- *
- * See Documentation/filesystems/caching/operations.rst
- */
-
-#define FSCACHE_DEBUG_LEVEL OPERATION
-#include <linux/module.h>
-#include <linux/seq_file.h>
-#include <linux/slab.h>
-#include "internal.h"
-
-atomic_t fscache_op_debug_id;
-EXPORT_SYMBOL(fscache_op_debug_id);
-
-static void fscache_operation_dummy_cancel(struct fscache_operation *op)
-{
-}
-
-/**
- * fscache_operation_init - Do basic initialisation of an operation
- * @cookie: The cookie to operate on
- * @op: The operation to initialise
- * @processor: The function to perform the operation
- * @cancel: A function to handle operation cancellation
- * @release: The release function to assign
- *
- * Do basic initialisation of an operation. The caller must still set flags,
- * object and processor if needed.
- */
-void fscache_operation_init(struct fscache_cookie *cookie,
- struct fscache_operation *op,
- fscache_operation_processor_t processor,
- fscache_operation_cancel_t cancel,
- fscache_operation_release_t release)
-{
- INIT_WORK(&op->work, fscache_op_work_func);
- atomic_set(&op->usage, 1);
- op->state = FSCACHE_OP_ST_INITIALISED;
- op->debug_id = atomic_inc_return(&fscache_op_debug_id);
- op->processor = processor;
- op->cancel = cancel ?: fscache_operation_dummy_cancel;
- op->release = release;
- INIT_LIST_HEAD(&op->pend_link);
- fscache_stat(&fscache_n_op_initialised);
- trace_fscache_op(cookie, op, fscache_op_init);
-}
-EXPORT_SYMBOL(fscache_operation_init);
-
-/**
- * fscache_enqueue_operation - Enqueue an operation for processing
- * @op: The operation to enqueue
- *
- * Enqueue an operation for processing by the FS-Cache thread pool.
- *
- * This will get its own ref on the object.
- */
-void fscache_enqueue_operation(struct fscache_operation *op)
-{
- struct fscache_cookie *cookie = op->object->cookie;
-
- _enter("{OBJ%x OP%x,%u}",
- op->object->debug_id, op->debug_id, atomic_read(&op->usage));
-
- ASSERT(list_empty(&op->pend_link));
- ASSERT(op->processor != NULL);
- ASSERT(fscache_object_is_available(op->object));
- ASSERTCMP(atomic_read(&op->usage), >, 0);
- ASSERTIFCMP(op->state != FSCACHE_OP_ST_IN_PROGRESS,
- op->state, ==, FSCACHE_OP_ST_CANCELLED);
-
- fscache_stat(&fscache_n_op_enqueue);
- switch (op->flags & FSCACHE_OP_TYPE) {
- case FSCACHE_OP_ASYNC:
- trace_fscache_op(cookie, op, fscache_op_enqueue_async);
- _debug("queue async");
- atomic_inc(&op->usage);
- if (!queue_work(fscache_op_wq, &op->work))
- fscache_put_operation(op);
- break;
- case FSCACHE_OP_MYTHREAD:
- trace_fscache_op(cookie, op, fscache_op_enqueue_mythread);
- _debug("queue for caller's attention");
- break;
- default:
- pr_err("Unexpected op type %lx", op->flags);
- BUG();
- break;
- }
-}
-EXPORT_SYMBOL(fscache_enqueue_operation);
-
-/*
- * start an op running
- */
-static void fscache_run_op(struct fscache_object *object,
- struct fscache_operation *op)
-{
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING);
-
- op->state = FSCACHE_OP_ST_IN_PROGRESS;
- object->n_in_progress++;
- if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
- wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
- if (op->processor)
- fscache_enqueue_operation(op);
- else
- trace_fscache_op(object->cookie, op, fscache_op_run);
- fscache_stat(&fscache_n_op_run);
-}
-
-/*
- * report an unexpected submission
- */
-static void fscache_report_unexpected_submission(struct fscache_object *object,
- struct fscache_operation *op,
- const struct fscache_state *ostate)
-{
- static bool once_only;
- struct fscache_operation *p;
- unsigned n;
-
- if (once_only)
- return;
- once_only = true;
-
- kdebug("unexpected submission OP%x [OBJ%x %s]",
- op->debug_id, object->debug_id, object->state->name);
- kdebug("objstate=%s [%s]", object->state->name, ostate->name);
- kdebug("objflags=%lx", object->flags);
- kdebug("objevent=%lx [%lx]", object->events, object->event_mask);
- kdebug("ops=%u inp=%u exc=%u",
- object->n_ops, object->n_in_progress, object->n_exclusive);
-
- if (!list_empty(&object->pending_ops)) {
- n = 0;
- list_for_each_entry(p, &object->pending_ops, pend_link) {
- ASSERTCMP(p->object, ==, object);
- kdebug("%p %p", op->processor, op->release);
- n++;
- }
-
- kdebug("n=%u", n);
- }
-
- dump_stack();
-}
-
-/*
- * submit an exclusive operation for an object
- * - other ops are excluded from running simultaneously with this one
- * - this gets any extra refs it needs on an op
- */
-int fscache_submit_exclusive_op(struct fscache_object *object,
- struct fscache_operation *op)
-{
- const struct fscache_state *ostate;
- unsigned long flags;
- int ret;
-
- _enter("{OBJ%x OP%x},", object->debug_id, op->debug_id);
-
- trace_fscache_op(object->cookie, op, fscache_op_submit_ex);
-
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED);
- ASSERTCMP(atomic_read(&op->usage), >, 0);
-
- spin_lock(&object->lock);
- ASSERTCMP(object->n_ops, >=, object->n_in_progress);
- ASSERTCMP(object->n_ops, >=, object->n_exclusive);
- ASSERT(list_empty(&op->pend_link));
-
- ostate = object->state;
- smp_rmb();
-
- op->state = FSCACHE_OP_ST_PENDING;
- flags = READ_ONCE(object->flags);
- if (unlikely(!(flags & BIT(FSCACHE_OBJECT_IS_LIVE)))) {
- fscache_stat(&fscache_n_op_rejected);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- } else if (unlikely(fscache_cache_is_broken(object))) {
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -EIO;
- } else if (flags & BIT(FSCACHE_OBJECT_IS_AVAILABLE)) {
- op->object = object;
- object->n_ops++;
- object->n_exclusive++; /* reads and writes must wait */
-
- if (object->n_in_progress > 0) {
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- } else if (!list_empty(&object->pending_ops)) {
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- fscache_start_operations(object);
- } else {
- ASSERTCMP(object->n_in_progress, ==, 0);
- fscache_run_op(object, op);
- }
-
- /* need to issue a new write op after this */
- clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags);
- ret = 0;
- } else if (flags & BIT(FSCACHE_OBJECT_IS_LOOKED_UP)) {
- op->object = object;
- object->n_ops++;
- object->n_exclusive++; /* reads and writes must wait */
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- ret = 0;
- } else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) {
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- } else {
- fscache_report_unexpected_submission(object, op, ostate);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- }
-
- spin_unlock(&object->lock);
- return ret;
-}
-
-/*
- * submit an operation for an object
- * - objects may be submitted only in the following states:
- * - during object creation (write ops may be submitted)
- * - whilst the object is active
- * - after an I/O error incurred in one of the two above states (op rejected)
- * - this gets any extra refs it needs on an op
- */
-int fscache_submit_op(struct fscache_object *object,
- struct fscache_operation *op)
-{
- const struct fscache_state *ostate;
- unsigned long flags;
- int ret;
-
- _enter("{OBJ%x OP%x},{%u}",
- object->debug_id, op->debug_id, atomic_read(&op->usage));
-
- trace_fscache_op(object->cookie, op, fscache_op_submit);
-
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED);
- ASSERTCMP(atomic_read(&op->usage), >, 0);
-
- spin_lock(&object->lock);
- ASSERTCMP(object->n_ops, >=, object->n_in_progress);
- ASSERTCMP(object->n_ops, >=, object->n_exclusive);
- ASSERT(list_empty(&op->pend_link));
-
- ostate = object->state;
- smp_rmb();
-
- op->state = FSCACHE_OP_ST_PENDING;
- flags = READ_ONCE(object->flags);
- if (unlikely(!(flags & BIT(FSCACHE_OBJECT_IS_LIVE)))) {
- fscache_stat(&fscache_n_op_rejected);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- } else if (unlikely(fscache_cache_is_broken(object))) {
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -EIO;
- } else if (flags & BIT(FSCACHE_OBJECT_IS_AVAILABLE)) {
- op->object = object;
- object->n_ops++;
-
- if (object->n_exclusive > 0) {
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- } else if (!list_empty(&object->pending_ops)) {
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- fscache_start_operations(object);
- } else {
- ASSERTCMP(object->n_exclusive, ==, 0);
- fscache_run_op(object, op);
- }
- ret = 0;
- } else if (flags & BIT(FSCACHE_OBJECT_IS_LOOKED_UP)) {
- op->object = object;
- object->n_ops++;
- atomic_inc(&op->usage);
- list_add_tail(&op->pend_link, &object->pending_ops);
- fscache_stat(&fscache_n_op_pend);
- ret = 0;
- } else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) {
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- } else {
- fscache_report_unexpected_submission(object, op, ostate);
- ASSERT(!fscache_object_is_active(object));
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- ret = -ENOBUFS;
- }
-
- spin_unlock(&object->lock);
- return ret;
-}
-
-/*
- * queue an object for withdrawal on error, aborting all following asynchronous
- * operations
- */
-void fscache_abort_object(struct fscache_object *object)
-{
- _enter("{OBJ%x}", object->debug_id);
-
- fscache_raise_event(object, FSCACHE_OBJECT_EV_ERROR);
-}
-
-/*
- * Jump start the operation processing on an object. The caller must hold
- * object->lock.
- */
-void fscache_start_operations(struct fscache_object *object)
-{
- struct fscache_operation *op;
- bool stop = false;
-
- while (!list_empty(&object->pending_ops) && !stop) {
- op = list_entry(object->pending_ops.next,
- struct fscache_operation, pend_link);
-
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) {
- if (object->n_in_progress > 0)
- break;
- stop = true;
- }
- list_del_init(&op->pend_link);
- fscache_run_op(object, op);
-
- /* the pending queue was holding a ref on the object */
- fscache_put_operation(op);
- }
-
- ASSERTCMP(object->n_in_progress, <=, object->n_ops);
-
- _debug("woke %d ops on OBJ%x",
- object->n_in_progress, object->debug_id);
-}
-
-/*
- * cancel an operation that's pending on an object
- */
-int fscache_cancel_op(struct fscache_operation *op,
- bool cancel_in_progress_op)
-{
- struct fscache_object *object = op->object;
- bool put = false;
- int ret;
-
- _enter("OBJ%x OP%x}", op->object->debug_id, op->debug_id);
-
- trace_fscache_op(object->cookie, op, fscache_op_cancel);
-
- ASSERTCMP(op->state, >=, FSCACHE_OP_ST_PENDING);
- ASSERTCMP(op->state, !=, FSCACHE_OP_ST_CANCELLED);
- ASSERTCMP(atomic_read(&op->usage), >, 0);
-
- spin_lock(&object->lock);
-
- ret = -EBUSY;
- if (op->state == FSCACHE_OP_ST_PENDING) {
- ASSERT(!list_empty(&op->pend_link));
- list_del_init(&op->pend_link);
- put = true;
-
- fscache_stat(&fscache_n_op_cancelled);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
- object->n_exclusive--;
- if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
- wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
- ret = 0;
- } else if (op->state == FSCACHE_OP_ST_IN_PROGRESS && cancel_in_progress_op) {
- ASSERTCMP(object->n_in_progress, >, 0);
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
- object->n_exclusive--;
- object->n_in_progress--;
- if (object->n_in_progress == 0)
- fscache_start_operations(object);
-
- fscache_stat(&fscache_n_op_cancelled);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
- object->n_exclusive--;
- if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
- wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
- ret = 0;
- }
-
- if (put)
- fscache_put_operation(op);
- spin_unlock(&object->lock);
- _leave(" = %d", ret);
- return ret;
-}
-
-/*
- * Cancel all pending operations on an object
- */
-void fscache_cancel_all_ops(struct fscache_object *object)
-{
- struct fscache_operation *op;
-
- _enter("OBJ%x", object->debug_id);
-
- spin_lock(&object->lock);
-
- while (!list_empty(&object->pending_ops)) {
- op = list_entry(object->pending_ops.next,
- struct fscache_operation, pend_link);
- fscache_stat(&fscache_n_op_cancelled);
- list_del_init(&op->pend_link);
-
- trace_fscache_op(object->cookie, op, fscache_op_cancel_all);
-
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING);
- op->cancel(op);
- op->state = FSCACHE_OP_ST_CANCELLED;
-
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
- object->n_exclusive--;
- if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags))
- wake_up_bit(&op->flags, FSCACHE_OP_WAITING);
- fscache_put_operation(op);
- cond_resched_lock(&object->lock);
- }
-
- spin_unlock(&object->lock);
- _leave("");
-}
-
-/*
- * Record the completion or cancellation of an in-progress operation.
- */
-void fscache_op_complete(struct fscache_operation *op, bool cancelled)
-{
- struct fscache_object *object = op->object;
-
- _enter("OBJ%x", object->debug_id);
-
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_IN_PROGRESS);
- ASSERTCMP(object->n_in_progress, >, 0);
- ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags),
- object->n_exclusive, >, 0);
- ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags),
- object->n_in_progress, ==, 1);
-
- spin_lock(&object->lock);
-
- if (!cancelled) {
- trace_fscache_op(object->cookie, op, fscache_op_completed);
- op->state = FSCACHE_OP_ST_COMPLETE;
- } else {
- op->cancel(op);
- trace_fscache_op(object->cookie, op, fscache_op_cancelled);
- op->state = FSCACHE_OP_ST_CANCELLED;
- }
-
- if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags))
- object->n_exclusive--;
- object->n_in_progress--;
- if (object->n_in_progress == 0)
- fscache_start_operations(object);
-
- spin_unlock(&object->lock);
- _leave("");
-}
-EXPORT_SYMBOL(fscache_op_complete);
-
-/*
- * release an operation
- * - queues pending ops if this is the last in-progress op
- */
-void fscache_put_operation(struct fscache_operation *op)
-{
- struct fscache_object *object;
- struct fscache_cache *cache;
-
- _enter("{OBJ%x OP%x,%d}",
- op->object ? op->object->debug_id : 0,
- op->debug_id, atomic_read(&op->usage));
-
- ASSERTCMP(atomic_read(&op->usage), >, 0);
-
- if (!atomic_dec_and_test(&op->usage))
- return;
-
- trace_fscache_op(op->object ? op->object->cookie : NULL, op, fscache_op_put);
-
- _debug("PUT OP");
- ASSERTIFCMP(op->state != FSCACHE_OP_ST_INITIALISED &&
- op->state != FSCACHE_OP_ST_COMPLETE,
- op->state, ==, FSCACHE_OP_ST_CANCELLED);
-
- fscache_stat(&fscache_n_op_release);
-
- if (op->release) {
- op->release(op);
- op->release = NULL;
- }
- op->state = FSCACHE_OP_ST_DEAD;
-
- object = op->object;
- if (likely(object)) {
- if (test_bit(FSCACHE_OP_DEC_READ_CNT, &op->flags))
- atomic_dec(&object->n_reads);
- if (test_bit(FSCACHE_OP_UNUSE_COOKIE, &op->flags))
- fscache_unuse_cookie(object);
-
- /* now... we may get called with the object spinlock held, so we
- * complete the cleanup here only if we can immediately acquire the
- * lock, and defer it otherwise */
- if (!spin_trylock(&object->lock)) {
- _debug("defer put");
- fscache_stat(&fscache_n_op_deferred_release);
-
- cache = object->cache;
- spin_lock(&cache->op_gc_list_lock);
- list_add_tail(&op->pend_link, &cache->op_gc_list);
- spin_unlock(&cache->op_gc_list_lock);
- schedule_work(&cache->op_gc);
- _leave(" [defer]");
- return;
- }
-
- ASSERTCMP(object->n_ops, >, 0);
- object->n_ops--;
- if (object->n_ops == 0)
- fscache_raise_event(object, FSCACHE_OBJECT_EV_CLEARED);
-
- spin_unlock(&object->lock);
- }
-
- kfree(op);
- _leave(" [done]");
-}
-EXPORT_SYMBOL(fscache_put_operation);
-
-/*
- * garbage collect operations that have had their release deferred
- */
-void fscache_operation_gc(struct work_struct *work)
-{
- struct fscache_operation *op;
- struct fscache_object *object;
- struct fscache_cache *cache =
- container_of(work, struct fscache_cache, op_gc);
- int count = 0;
-
- _enter("");
-
- do {
- spin_lock(&cache->op_gc_list_lock);
- if (list_empty(&cache->op_gc_list)) {
- spin_unlock(&cache->op_gc_list_lock);
- break;
- }
-
- op = list_entry(cache->op_gc_list.next,
- struct fscache_operation, pend_link);
- list_del(&op->pend_link);
- spin_unlock(&cache->op_gc_list_lock);
-
- object = op->object;
- trace_fscache_op(object->cookie, op, fscache_op_gc);
-
- spin_lock(&object->lock);
-
- _debug("GC DEFERRED REL OBJ%x OP%x",
- object->debug_id, op->debug_id);
- fscache_stat(&fscache_n_op_gc);
-
- ASSERTCMP(atomic_read(&op->usage), ==, 0);
- ASSERTCMP(op->state, ==, FSCACHE_OP_ST_DEAD);
-
- ASSERTCMP(object->n_ops, >, 0);
- object->n_ops--;
- if (object->n_ops == 0)
- fscache_raise_event(object, FSCACHE_OBJECT_EV_CLEARED);
-
- spin_unlock(&object->lock);
- kfree(op);
-
- } while (count++ < 20);
-
- if (!list_empty(&cache->op_gc_list))
- schedule_work(&cache->op_gc);
-
- _leave("");
-}
-
-/*
- * execute an operation using fs_op_wq to provide processing context -
- * the caller holds a ref to this object, so we don't need to hold one
- */
-void fscache_op_work_func(struct work_struct *work)
-{
- struct fscache_operation *op =
- container_of(work, struct fscache_operation, work);
-
- _enter("{OBJ%x OP%x,%d}",
- op->object->debug_id, op->debug_id, atomic_read(&op->usage));
-
- trace_fscache_op(op->object->cookie, op, fscache_op_work);
-
- ASSERT(op->processor != NULL);
- op->processor(op);
- fscache_put_operation(op);
-
- _leave("");
-}
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