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![David Howells](/assets/img/avatar_default.png)
Provide fscache_cancel_op() with a pointer to a function it should invoke under lock if it cancels an operation. Use this to clear the remaining page count upon cancellation of a pending retrieval operation so that fscache_release_retrieval_op() doesn't get an assertion failure (see below). This can happen when a signal occurs, say from CTRL-C being pressed during data retrieval. FS-Cache: Assertion failed 3 == 0 is false ------------[ cut here ]------------ kernel BUG at fs/fscache/page.c:237! invalid opcode: 0000 [#641] SMP Modules linked in: cachefiles(F) nfsv4(F) nfsv3(F) nfsv2(F) nfs(F) fscache(F) auth_rpcgss(F) nfs_acl(F) lockd(F) sunrpc(F) CPU 0 Pid: 6075, comm: slurp-q Tainted: GF D 3.7.0-rc8-fsdevel+ #411 /DG965RY RIP: 0010:[<ffffffffa007f328>] [<ffffffffa007f328>] fscache_release_retrieval_op+0x75/0xff [fscache] RSP: 0000:ffff88001c6d7988 EFLAGS: 00010296 RAX: 000000000000000f RBX: ffff880014cdfe00 RCX: ffffffff6c102000 RDX: ffffffff8102d1ad RSI: ffffffff6c102000 RDI: ffffffff8102d1d6 RBP: ffff88001c6d7998 R08: 0000000000000002 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000fffffe00 R13: ffff88001c6d7ab4 R14: ffff88001a8638a0 R15: ffff88001552b190 FS: 00007f877aaf0700(0000) GS:ffff88003bc00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b CR2: 00007fff11378fd2 CR3: 000000001c6c6000 CR4: 00000000000007f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 Process slurp-q (pid: 6075, threadinfo ffff88001c6d6000, task ffff88001c6c4080) Stack: ffffffffa007ec07 ffff880014cdfe00 ffff88001c6d79c8 ffffffffa007db4d ffffffffa007ec07 ffff880014cdfe00 00000000fffffe00 ffff88001c6d7ab4 ffff88001c6d7a38 ffffffffa008116d 0000000000000000 ffff88001c6c4080 Call Trace: [<ffffffffa007ec07>] ? fscache_cancel_op+0x194/0x1cf [fscache] [<ffffffffa007db4d>] fscache_put_operation+0x135/0x2ed [fscache] [<ffffffffa007ec07>] ? fscache_cancel_op+0x194/0x1cf [fscache] [<ffffffffa008116d>] __fscache_read_or_alloc_pages+0x413/0x4bc [fscache] [<ffffffff810ac8ae>] ? __alloc_pages_nodemask+0x195/0x75c [<ffffffffa00aab0f>] __nfs_readpages_from_fscache+0x86/0x13d [nfs] [<ffffffffa00a5fe0>] nfs_readpages+0x186/0x1bd [nfs] [<ffffffff810d23c8>] ? alloc_pages_current+0xc7/0xe4 [<ffffffff810a68b5>] ? __page_cache_alloc+0x84/0x91 [<ffffffff810af912>] ? __do_page_cache_readahead+0xa6/0x2e0 [<ffffffff810afaa3>] __do_page_cache_readahead+0x237/0x2e0 [<ffffffff810af912>] ? __do_page_cache_readahead+0xa6/0x2e0 [<ffffffff810afe3e>] ra_submit+0x1c/0x20 [<ffffffff810b019b>] ondemand_readahead+0x359/0x382 [<ffffffff810b0279>] page_cache_sync_readahead+0x38/0x3a [<ffffffff810a77b5>] generic_file_aio_read+0x26b/0x637 [<ffffffffa00f1852>] ? nfs_mark_delegation_referenced+0xb/0xb [nfsv4] [<ffffffffa009cc85>] nfs_file_read+0xaa/0xcf [nfs] [<ffffffff810db5b3>] do_sync_read+0x91/0xd1 [<ffffffff810dbb8b>] vfs_read+0x9b/0x144 [<ffffffff810dbc78>] sys_read+0x44/0x75 [<ffffffff81422892>] system_call_fastpath+0x16/0x1b Signed-off-by: David Howells <dhowells@redhat.com>
539 lines
14 KiB
C
539 lines
14 KiB
C
/* 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 (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* See Documentation/filesystems/caching/operations.txt
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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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/**
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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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_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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ASSERTCMP(op->object->state, >=, FSCACHE_OBJECT_AVAILABLE);
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ASSERTCMP(atomic_read(&op->usage), >, 0);
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ASSERTCMP(op->state, ==, FSCACHE_OP_ST_IN_PROGRESS);
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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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_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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_debug("queue for caller's attention");
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break;
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default:
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printk(KERN_ERR "FS-Cache: Unexpected op type %lx",
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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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fscache_stat(&fscache_n_op_run);
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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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int ret;
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_enter("{OBJ%x OP%x},", object->debug_id, op->debug_id);
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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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op->state = FSCACHE_OP_ST_PENDING;
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if (fscache_object_is_active(object)) {
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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 (object->state == FSCACHE_OBJECT_CREATING) {
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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 {
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/* If we're in any other state, there must have been an I/O
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* error of some nature.
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*/
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ASSERT(test_bit(FSCACHE_IOERROR, &object->cache->flags));
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ret = -EIO;
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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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* 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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unsigned long 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,
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fscache_object_states[object->state]);
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kdebug("objstate=%s [%s]",
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fscache_object_states[object->state],
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fscache_object_states[ostate]);
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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 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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unsigned long ostate;
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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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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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if (fscache_object_is_active(object)) {
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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 (object->state == FSCACHE_OBJECT_CREATING) {
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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 (object->state == FSCACHE_OBJECT_DYING ||
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object->state == FSCACHE_OBJECT_LC_DYING ||
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object->state == FSCACHE_OBJECT_WITHDRAWING) {
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fscache_stat(&fscache_n_op_rejected);
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op->state = FSCACHE_OP_ST_CANCELLED;
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ret = -ENOBUFS;
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} else if (!test_bit(FSCACHE_IOERROR, &object->cache->flags)) {
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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->state = FSCACHE_OP_ST_CANCELLED;
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ret = -ENOBUFS;
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} else {
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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
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* - caller must hold 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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void (*do_cancel)(struct fscache_operation *))
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{
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struct fscache_object *object = op->object;
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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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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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fscache_stat(&fscache_n_op_cancelled);
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list_del_init(&op->pend_link);
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if (do_cancel)
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do_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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ret = 0;
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}
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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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ASSERTCMP(op->state, ==, FSCACHE_OP_ST_PENDING);
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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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op->state = cancelled ?
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FSCACHE_OP_ST_CANCELLED : FSCACHE_OP_ST_COMPLETE;
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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->debug_id, op->debug_id, atomic_read(&op->usage));
|
|
|
|
ASSERTCMP(atomic_read(&op->usage), >, 0);
|
|
|
|
if (!atomic_dec_and_test(&op->usage))
|
|
return;
|
|
|
|
_debug("PUT OP");
|
|
ASSERTIFCMP(op->state != FSCACHE_OP_ST_COMPLETE,
|
|
op->state, ==, FSCACHE_OP_ST_CANCELLED);
|
|
op->state = FSCACHE_OP_ST_DEAD;
|
|
|
|
fscache_stat(&fscache_n_op_release);
|
|
|
|
if (op->release) {
|
|
op->release(op);
|
|
op->release = NULL;
|
|
}
|
|
|
|
object = op->object;
|
|
|
|
if (test_bit(FSCACHE_OP_DEC_READ_CNT, &op->flags)) {
|
|
if (atomic_dec_and_test(&object->n_reads)) {
|
|
clear_bit(FSCACHE_COOKIE_WAITING_ON_READS,
|
|
&object->cookie->flags);
|
|
wake_up_bit(&object->cookie->flags,
|
|
FSCACHE_COOKIE_WAITING_ON_READS);
|
|
}
|
|
}
|
|
|
|
/* 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;
|
|
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);
|
|
unsigned long start;
|
|
|
|
_enter("{OBJ%x OP%x,%d}",
|
|
op->object->debug_id, op->debug_id, atomic_read(&op->usage));
|
|
|
|
ASSERT(op->processor != NULL);
|
|
start = jiffies;
|
|
op->processor(op);
|
|
fscache_hist(fscache_ops_histogram, start);
|
|
fscache_put_operation(op);
|
|
|
|
_leave("");
|
|
}
|