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633 lines
17 KiB
633 lines
17 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* FS-Cache worker operation management routines |
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* |
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* Copyright (C) 2008 Red Hat, Inc. All Rights Reserved. |
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* Written by David Howells ([email protected]) |
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* |
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* See Documentation/filesystems/caching/operations.rst |
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*/ |
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#define FSCACHE_DEBUG_LEVEL OPERATION |
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#include <linux/module.h> |
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#include <linux/seq_file.h> |
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#include <linux/slab.h> |
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#include "internal.h" |
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atomic_t fscache_op_debug_id; |
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EXPORT_SYMBOL(fscache_op_debug_id); |
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static void fscache_operation_dummy_cancel(struct fscache_operation *op) |
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{ |
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} |
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/** |
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* fscache_operation_init - Do basic initialisation of an operation |
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* @cookie: The cookie to operate on |
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* @op: The operation to initialise |
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* @processor: The function to perform the operation |
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* @cancel: A function to handle operation cancellation |
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* @release: The release function to assign |
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* |
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* Do basic initialisation of an operation. The caller must still set flags, |
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* object and processor if needed. |
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*/ |
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void fscache_operation_init(struct fscache_cookie *cookie, |
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struct fscache_operation *op, |
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fscache_operation_processor_t processor, |
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fscache_operation_cancel_t cancel, |
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fscache_operation_release_t release) |
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{ |
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INIT_WORK(&op->work, fscache_op_work_func); |
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atomic_set(&op->usage, 1); |
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op->state = FSCACHE_OP_ST_INITIALISED; |
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op->debug_id = atomic_inc_return(&fscache_op_debug_id); |
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op->processor = processor; |
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op->cancel = cancel ?: fscache_operation_dummy_cancel; |
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op->release = release; |
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INIT_LIST_HEAD(&op->pend_link); |
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fscache_stat(&fscache_n_op_initialised); |
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trace_fscache_op(cookie, op, fscache_op_init); |
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} |
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EXPORT_SYMBOL(fscache_operation_init); |
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/** |
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* fscache_enqueue_operation - Enqueue an operation for processing |
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* @op: The operation to enqueue |
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* |
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* Enqueue an operation for processing by the FS-Cache thread pool. |
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* |
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* This will get its own ref on the object. |
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*/ |
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void fscache_enqueue_operation(struct fscache_operation *op) |
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{ |
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struct fscache_cookie *cookie = op->object->cookie; |
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_enter("{OBJ%x OP%x,%u}", |
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op->object->debug_id, op->debug_id, atomic_read(&op->usage)); |
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ASSERT(list_empty(&op->pend_link)); |
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ASSERT(op->processor != NULL); |
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ASSERT(fscache_object_is_available(op->object)); |
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ASSERTCMP(atomic_read(&op->usage), >, 0); |
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ASSERTIFCMP(op->state != FSCACHE_OP_ST_IN_PROGRESS, |
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op->state, ==, FSCACHE_OP_ST_CANCELLED); |
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fscache_stat(&fscache_n_op_enqueue); |
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switch (op->flags & FSCACHE_OP_TYPE) { |
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case FSCACHE_OP_ASYNC: |
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trace_fscache_op(cookie, op, fscache_op_enqueue_async); |
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_debug("queue async"); |
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atomic_inc(&op->usage); |
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if (!queue_work(fscache_op_wq, &op->work)) |
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fscache_put_operation(op); |
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break; |
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case FSCACHE_OP_MYTHREAD: |
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trace_fscache_op(cookie, op, fscache_op_enqueue_mythread); |
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_debug("queue for caller's attention"); |
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break; |
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default: |
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pr_err("Unexpected op type %lx", op->flags); |
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BUG(); |
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break; |
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} |
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} |
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EXPORT_SYMBOL(fscache_enqueue_operation); |
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/* |
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* start an op running |
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*/ |
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static void fscache_run_op(struct fscache_object *object, |
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struct fscache_operation *op) |
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{ |
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ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING); |
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op->state = FSCACHE_OP_ST_IN_PROGRESS; |
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object->n_in_progress++; |
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if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) |
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wake_up_bit(&op->flags, FSCACHE_OP_WAITING); |
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if (op->processor) |
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fscache_enqueue_operation(op); |
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else |
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trace_fscache_op(object->cookie, op, fscache_op_run); |
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fscache_stat(&fscache_n_op_run); |
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} |
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/* |
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* report an unexpected submission |
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*/ |
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static void fscache_report_unexpected_submission(struct fscache_object *object, |
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struct fscache_operation *op, |
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const struct fscache_state *ostate) |
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{ |
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static bool once_only; |
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struct fscache_operation *p; |
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unsigned n; |
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if (once_only) |
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return; |
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once_only = true; |
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kdebug("unexpected submission OP%x [OBJ%x %s]", |
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op->debug_id, object->debug_id, object->state->name); |
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kdebug("objstate=%s [%s]", object->state->name, ostate->name); |
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kdebug("objflags=%lx", object->flags); |
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kdebug("objevent=%lx [%lx]", object->events, object->event_mask); |
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kdebug("ops=%u inp=%u exc=%u", |
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object->n_ops, object->n_in_progress, object->n_exclusive); |
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if (!list_empty(&object->pending_ops)) { |
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n = 0; |
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list_for_each_entry(p, &object->pending_ops, pend_link) { |
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ASSERTCMP(p->object, ==, object); |
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kdebug("%p %p", op->processor, op->release); |
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n++; |
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} |
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kdebug("n=%u", n); |
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} |
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dump_stack(); |
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} |
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/* |
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* submit an exclusive operation for an object |
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* - other ops are excluded from running simultaneously with this one |
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* - this gets any extra refs it needs on an op |
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*/ |
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int fscache_submit_exclusive_op(struct fscache_object *object, |
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struct fscache_operation *op) |
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{ |
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const struct fscache_state *ostate; |
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unsigned long flags; |
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int ret; |
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_enter("{OBJ%x OP%x},", object->debug_id, op->debug_id); |
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trace_fscache_op(object->cookie, op, fscache_op_submit_ex); |
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ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED); |
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ASSERTCMP(atomic_read(&op->usage), >, 0); |
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spin_lock(&object->lock); |
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ASSERTCMP(object->n_ops, >=, object->n_in_progress); |
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ASSERTCMP(object->n_ops, >=, object->n_exclusive); |
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ASSERT(list_empty(&op->pend_link)); |
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ostate = object->state; |
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smp_rmb(); |
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op->state = FSCACHE_OP_ST_PENDING; |
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flags = READ_ONCE(object->flags); |
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if (unlikely(!(flags & BIT(FSCACHE_OBJECT_IS_LIVE)))) { |
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fscache_stat(&fscache_n_op_rejected); |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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ret = -ENOBUFS; |
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} else if (unlikely(fscache_cache_is_broken(object))) { |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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ret = -EIO; |
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} else if (flags & BIT(FSCACHE_OBJECT_IS_AVAILABLE)) { |
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op->object = object; |
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object->n_ops++; |
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object->n_exclusive++; /* reads and writes must wait */ |
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if (object->n_in_progress > 0) { |
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atomic_inc(&op->usage); |
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list_add_tail(&op->pend_link, &object->pending_ops); |
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fscache_stat(&fscache_n_op_pend); |
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} else if (!list_empty(&object->pending_ops)) { |
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atomic_inc(&op->usage); |
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list_add_tail(&op->pend_link, &object->pending_ops); |
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fscache_stat(&fscache_n_op_pend); |
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fscache_start_operations(object); |
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} else { |
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ASSERTCMP(object->n_in_progress, ==, 0); |
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fscache_run_op(object, op); |
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} |
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/* need to issue a new write op after this */ |
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clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags); |
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ret = 0; |
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} else if (flags & BIT(FSCACHE_OBJECT_IS_LOOKED_UP)) { |
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op->object = object; |
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object->n_ops++; |
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object->n_exclusive++; /* reads and writes must wait */ |
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atomic_inc(&op->usage); |
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list_add_tail(&op->pend_link, &object->pending_ops); |
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fscache_stat(&fscache_n_op_pend); |
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ret = 0; |
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} else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) { |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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ret = -ENOBUFS; |
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} else { |
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fscache_report_unexpected_submission(object, op, ostate); |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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ret = -ENOBUFS; |
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} |
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spin_unlock(&object->lock); |
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return ret; |
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} |
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/* |
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* submit an operation for an object |
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* - objects may be submitted only in the following states: |
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* - during object creation (write ops may be submitted) |
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* - whilst the object is active |
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* - after an I/O error incurred in one of the two above states (op rejected) |
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* - this gets any extra refs it needs on an op |
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*/ |
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int fscache_submit_op(struct fscache_object *object, |
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struct fscache_operation *op) |
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{ |
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const struct fscache_state *ostate; |
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unsigned long flags; |
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int ret; |
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_enter("{OBJ%x OP%x},{%u}", |
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object->debug_id, op->debug_id, atomic_read(&op->usage)); |
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trace_fscache_op(object->cookie, op, fscache_op_submit); |
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ASSERTCMP(op->state, ==, FSCACHE_OP_ST_INITIALISED); |
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ASSERTCMP(atomic_read(&op->usage), >, 0); |
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spin_lock(&object->lock); |
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ASSERTCMP(object->n_ops, >=, object->n_in_progress); |
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ASSERTCMP(object->n_ops, >=, object->n_exclusive); |
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ASSERT(list_empty(&op->pend_link)); |
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ostate = object->state; |
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smp_rmb(); |
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op->state = FSCACHE_OP_ST_PENDING; |
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flags = READ_ONCE(object->flags); |
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if (unlikely(!(flags & BIT(FSCACHE_OBJECT_IS_LIVE)))) { |
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fscache_stat(&fscache_n_op_rejected); |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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ret = -ENOBUFS; |
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} else if (unlikely(fscache_cache_is_broken(object))) { |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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ret = -EIO; |
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} else if (flags & BIT(FSCACHE_OBJECT_IS_AVAILABLE)) { |
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op->object = object; |
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object->n_ops++; |
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if (object->n_exclusive > 0) { |
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atomic_inc(&op->usage); |
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list_add_tail(&op->pend_link, &object->pending_ops); |
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fscache_stat(&fscache_n_op_pend); |
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} else if (!list_empty(&object->pending_ops)) { |
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atomic_inc(&op->usage); |
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list_add_tail(&op->pend_link, &object->pending_ops); |
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fscache_stat(&fscache_n_op_pend); |
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fscache_start_operations(object); |
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} else { |
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ASSERTCMP(object->n_exclusive, ==, 0); |
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fscache_run_op(object, op); |
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} |
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ret = 0; |
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} else if (flags & BIT(FSCACHE_OBJECT_IS_LOOKED_UP)) { |
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op->object = object; |
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object->n_ops++; |
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atomic_inc(&op->usage); |
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list_add_tail(&op->pend_link, &object->pending_ops); |
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fscache_stat(&fscache_n_op_pend); |
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ret = 0; |
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} else if (flags & BIT(FSCACHE_OBJECT_KILLED_BY_CACHE)) { |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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ret = -ENOBUFS; |
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} else { |
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fscache_report_unexpected_submission(object, op, ostate); |
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ASSERT(!fscache_object_is_active(object)); |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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ret = -ENOBUFS; |
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} |
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spin_unlock(&object->lock); |
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return ret; |
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} |
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/* |
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* queue an object for withdrawal on error, aborting all following asynchronous |
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* operations |
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*/ |
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void fscache_abort_object(struct fscache_object *object) |
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{ |
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_enter("{OBJ%x}", object->debug_id); |
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fscache_raise_event(object, FSCACHE_OBJECT_EV_ERROR); |
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} |
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/* |
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* Jump start the operation processing on an object. The caller must hold |
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* object->lock. |
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*/ |
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void fscache_start_operations(struct fscache_object *object) |
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{ |
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struct fscache_operation *op; |
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bool stop = false; |
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while (!list_empty(&object->pending_ops) && !stop) { |
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op = list_entry(object->pending_ops.next, |
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struct fscache_operation, pend_link); |
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if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) { |
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if (object->n_in_progress > 0) |
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break; |
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stop = true; |
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} |
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list_del_init(&op->pend_link); |
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fscache_run_op(object, op); |
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/* the pending queue was holding a ref on the object */ |
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fscache_put_operation(op); |
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} |
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ASSERTCMP(object->n_in_progress, <=, object->n_ops); |
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_debug("woke %d ops on OBJ%x", |
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object->n_in_progress, object->debug_id); |
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} |
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/* |
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* cancel an operation that's pending on an object |
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*/ |
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int fscache_cancel_op(struct fscache_operation *op, |
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bool cancel_in_progress_op) |
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{ |
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struct fscache_object *object = op->object; |
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bool put = false; |
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int ret; |
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_enter("OBJ%x OP%x}", op->object->debug_id, op->debug_id); |
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trace_fscache_op(object->cookie, op, fscache_op_cancel); |
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ASSERTCMP(op->state, >=, FSCACHE_OP_ST_PENDING); |
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ASSERTCMP(op->state, !=, FSCACHE_OP_ST_CANCELLED); |
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ASSERTCMP(atomic_read(&op->usage), >, 0); |
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spin_lock(&object->lock); |
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ret = -EBUSY; |
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if (op->state == FSCACHE_OP_ST_PENDING) { |
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ASSERT(!list_empty(&op->pend_link)); |
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list_del_init(&op->pend_link); |
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put = true; |
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fscache_stat(&fscache_n_op_cancelled); |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) |
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object->n_exclusive--; |
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if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) |
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wake_up_bit(&op->flags, FSCACHE_OP_WAITING); |
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ret = 0; |
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} else if (op->state == FSCACHE_OP_ST_IN_PROGRESS && cancel_in_progress_op) { |
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ASSERTCMP(object->n_in_progress, >, 0); |
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if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) |
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object->n_exclusive--; |
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object->n_in_progress--; |
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if (object->n_in_progress == 0) |
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fscache_start_operations(object); |
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fscache_stat(&fscache_n_op_cancelled); |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) |
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object->n_exclusive--; |
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if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) |
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wake_up_bit(&op->flags, FSCACHE_OP_WAITING); |
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ret = 0; |
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} |
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if (put) |
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fscache_put_operation(op); |
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spin_unlock(&object->lock); |
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_leave(" = %d", ret); |
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return ret; |
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} |
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/* |
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* Cancel all pending operations on an object |
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*/ |
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void fscache_cancel_all_ops(struct fscache_object *object) |
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{ |
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struct fscache_operation *op; |
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_enter("OBJ%x", object->debug_id); |
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spin_lock(&object->lock); |
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while (!list_empty(&object->pending_ops)) { |
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op = list_entry(object->pending_ops.next, |
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struct fscache_operation, pend_link); |
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fscache_stat(&fscache_n_op_cancelled); |
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list_del_init(&op->pend_link); |
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trace_fscache_op(object->cookie, op, fscache_op_cancel_all); |
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ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING); |
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op->cancel(op); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) |
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object->n_exclusive--; |
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if (test_and_clear_bit(FSCACHE_OP_WAITING, &op->flags)) |
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wake_up_bit(&op->flags, FSCACHE_OP_WAITING); |
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fscache_put_operation(op); |
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cond_resched_lock(&object->lock); |
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} |
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spin_unlock(&object->lock); |
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_leave(""); |
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} |
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/* |
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* Record the completion or cancellation of an in-progress operation. |
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*/ |
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void fscache_op_complete(struct fscache_operation *op, bool cancelled) |
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{ |
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struct fscache_object *object = op->object; |
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_enter("OBJ%x", object->debug_id); |
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ASSERTCMP(op->state, ==, FSCACHE_OP_ST_IN_PROGRESS); |
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ASSERTCMP(object->n_in_progress, >, 0); |
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ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags), |
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object->n_exclusive, >, 0); |
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ASSERTIFCMP(test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags), |
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object->n_in_progress, ==, 1); |
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spin_lock(&object->lock); |
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if (!cancelled) { |
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trace_fscache_op(object->cookie, op, fscache_op_completed); |
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op->state = FSCACHE_OP_ST_COMPLETE; |
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} else { |
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op->cancel(op); |
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trace_fscache_op(object->cookie, op, fscache_op_cancelled); |
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op->state = FSCACHE_OP_ST_CANCELLED; |
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} |
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if (test_bit(FSCACHE_OP_EXCLUSIVE, &op->flags)) |
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object->n_exclusive--; |
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object->n_in_progress--; |
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if (object->n_in_progress == 0) |
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fscache_start_operations(object); |
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spin_unlock(&object->lock); |
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_leave(""); |
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} |
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EXPORT_SYMBOL(fscache_op_complete); |
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/* |
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* release an operation |
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* - queues pending ops if this is the last in-progress op |
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*/ |
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void fscache_put_operation(struct fscache_operation *op) |
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{ |
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struct fscache_object *object; |
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struct fscache_cache *cache; |
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_enter("{OBJ%x OP%x,%d}", |
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op->object ? op->object->debug_id : 0, |
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op->debug_id, atomic_read(&op->usage)); |
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ASSERTCMP(atomic_read(&op->usage), >, 0); |
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if (!atomic_dec_and_test(&op->usage)) |
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return; |
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trace_fscache_op(op->object ? op->object->cookie : NULL, op, fscache_op_put); |
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_debug("PUT OP"); |
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ASSERTIFCMP(op->state != FSCACHE_OP_ST_INITIALISED && |
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op->state != FSCACHE_OP_ST_COMPLETE, |
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op->state, ==, FSCACHE_OP_ST_CANCELLED); |
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fscache_stat(&fscache_n_op_release); |
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if (op->release) { |
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op->release(op); |
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op->release = NULL; |
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} |
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op->state = FSCACHE_OP_ST_DEAD; |
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object = op->object; |
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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(""); |
|
}
|
|
|