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fs/fscache/page.c
31 KB
b51088228 FS-Cache: Impleme... |
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/* Cache page management and data I/O routines * * Copyright (C) 2004-2008 Red Hat, Inc. All Rights Reserved. * Written by David Howells (dhowells@redhat.com) * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * as published by the Free Software Foundation; either version * 2 of the License, or (at your option) any later version. */ #define FSCACHE_DEBUG_LEVEL PAGE #include <linux/module.h> #include <linux/fscache-cache.h> #include <linux/buffer_head.h> #include <linux/pagevec.h> |
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#include <linux/slab.h> |
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#include "internal.h" /* * check to see if a page is being written to the cache */ bool __fscache_check_page_write(struct fscache_cookie *cookie, struct page *page) { void *val; rcu_read_lock(); val = radix_tree_lookup(&cookie->stores, page->index); rcu_read_unlock(); return val != NULL; } EXPORT_SYMBOL(__fscache_check_page_write); /* * wait for a page to finish being written to the cache */ void __fscache_wait_on_page_write(struct fscache_cookie *cookie, struct page *page) { wait_queue_head_t *wq = bit_waitqueue(&cookie->flags, 0); wait_event(*wq, !__fscache_check_page_write(cookie, page)); } EXPORT_SYMBOL(__fscache_wait_on_page_write); /* |
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* wait for a page to finish being written to the cache. Put a timeout here * since we might be called recursively via parent fs. */ static bool release_page_wait_timeout(struct fscache_cookie *cookie, struct page *page) { wait_queue_head_t *wq = bit_waitqueue(&cookie->flags, 0); return wait_event_timeout(*wq, !__fscache_check_page_write(cookie, page), HZ); } /* |
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* decide whether a page can be released, possibly by cancelling a store to it |
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* - we're allowed to sleep if __GFP_DIRECT_RECLAIM is flagged |
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*/ bool __fscache_maybe_release_page(struct fscache_cookie *cookie, struct page *page, gfp_t gfp) { struct page *xpage; void *val; _enter("%p,%p,%x", cookie, page, gfp); |
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try_again: |
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rcu_read_lock(); val = radix_tree_lookup(&cookie->stores, page->index); if (!val) { rcu_read_unlock(); fscache_stat(&fscache_n_store_vmscan_not_storing); __fscache_uncache_page(cookie, page); return true; } /* see if the page is actually undergoing storage - if so we can't get * rid of it till the cache has finished with it */ if (radix_tree_tag_get(&cookie->stores, page->index, FSCACHE_COOKIE_STORING_TAG)) { rcu_read_unlock(); goto page_busy; } /* the page is pending storage, so we attempt to cancel the store and * discard the store request so that the page can be reclaimed */ spin_lock(&cookie->stores_lock); rcu_read_unlock(); if (radix_tree_tag_get(&cookie->stores, page->index, FSCACHE_COOKIE_STORING_TAG)) { /* the page started to undergo storage whilst we were looking, * so now we can only wait or return */ spin_unlock(&cookie->stores_lock); goto page_busy; } xpage = radix_tree_delete(&cookie->stores, page->index); spin_unlock(&cookie->stores_lock); if (xpage) { fscache_stat(&fscache_n_store_vmscan_cancelled); fscache_stat(&fscache_n_store_radix_deletes); ASSERTCMP(xpage, ==, page); } else { fscache_stat(&fscache_n_store_vmscan_gone); } wake_up_bit(&cookie->flags, 0); if (xpage) |
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put_page(xpage); |
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__fscache_uncache_page(cookie, page); return true; page_busy: |
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/* We will wait here if we're allowed to, but that could deadlock the * allocator as the work threads writing to the cache may all end up * sleeping on memory allocation, so we may need to impose a timeout * too. */ |
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if (!(gfp & __GFP_DIRECT_RECLAIM) || !(gfp & __GFP_FS)) { |
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fscache_stat(&fscache_n_store_vmscan_busy); return false; } fscache_stat(&fscache_n_store_vmscan_wait); |
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if (!release_page_wait_timeout(cookie, page)) _debug("fscache writeout timeout page: %p{%lx}", page, page->index); |
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gfp &= ~__GFP_DIRECT_RECLAIM; |
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goto try_again; |
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} EXPORT_SYMBOL(__fscache_maybe_release_page); /* |
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* note that a page has finished being written to the cache */ |
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static void fscache_end_page_write(struct fscache_object *object, struct page *page) |
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{ |
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struct fscache_cookie *cookie; struct page *xpage = NULL; |
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|
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spin_lock(&object->lock); cookie = object->cookie; if (cookie) { /* delete the page from the tree if it is now no longer * pending */ spin_lock(&cookie->stores_lock); |
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radix_tree_tag_clear(&cookie->stores, page->index, FSCACHE_COOKIE_STORING_TAG); |
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if (!radix_tree_tag_get(&cookie->stores, page->index, FSCACHE_COOKIE_PENDING_TAG)) { fscache_stat(&fscache_n_store_radix_deletes); xpage = radix_tree_delete(&cookie->stores, page->index); } |
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spin_unlock(&cookie->stores_lock); wake_up_bit(&cookie->flags, 0); } spin_unlock(&object->lock); if (xpage) |
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put_page(xpage); |
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} /* * actually apply the changed attributes to a cache object */ static void fscache_attr_changed_op(struct fscache_operation *op) { struct fscache_object *object = op->object; |
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int ret; |
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_enter("{OBJ%x OP%x}", object->debug_id, op->debug_id); fscache_stat(&fscache_n_attr_changed_calls); |
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if (fscache_object_is_active(object)) { |
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fscache_stat(&fscache_n_cop_attr_changed); |
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ret = object->cache->ops->attr_changed(object); |
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fscache_stat_d(&fscache_n_cop_attr_changed); |
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if (ret < 0) fscache_abort_object(object); } |
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|
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fscache_op_complete(op, true); |
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_leave(""); } /* * notification that the attributes on an object have changed */ int __fscache_attr_changed(struct fscache_cookie *cookie) { struct fscache_operation *op; struct fscache_object *object; |
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bool wake_cookie = false; |
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_enter("%p", cookie); ASSERTCMP(cookie->def->type, !=, FSCACHE_COOKIE_TYPE_INDEX); fscache_stat(&fscache_n_attr_changed); op = kzalloc(sizeof(*op), GFP_KERNEL); if (!op) { fscache_stat(&fscache_n_attr_changed_nomem); _leave(" = -ENOMEM"); return -ENOMEM; } |
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fscache_operation_init(op, fscache_attr_changed_op, NULL, NULL); |
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op->flags = FSCACHE_OP_ASYNC | (1 << FSCACHE_OP_EXCLUSIVE) | (1 << FSCACHE_OP_UNUSE_COOKIE); |
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spin_lock(&cookie->lock); |
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if (!fscache_cookie_enabled(cookie) || hlist_empty(&cookie->backing_objects)) |
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goto nobufs; object = hlist_entry(cookie->backing_objects.first, struct fscache_object, cookie_link); |
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__fscache_use_cookie(cookie); |
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if (fscache_submit_exclusive_op(object, op) < 0) |
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goto nobufs_dec; |
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spin_unlock(&cookie->lock); fscache_stat(&fscache_n_attr_changed_ok); fscache_put_operation(op); _leave(" = 0"); return 0; |
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nobufs_dec: |
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wake_cookie = __fscache_unuse_cookie(cookie); |
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nobufs: |
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spin_unlock(&cookie->lock); |
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fscache_put_operation(op); |
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if (wake_cookie) __fscache_wake_unused_cookie(cookie); |
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fscache_stat(&fscache_n_attr_changed_nobufs); _leave(" = %d", -ENOBUFS); return -ENOBUFS; } EXPORT_SYMBOL(__fscache_attr_changed); /* |
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* Handle cancellation of a pending retrieval op */ static void fscache_do_cancel_retrieval(struct fscache_operation *_op) { struct fscache_retrieval *op = container_of(_op, struct fscache_retrieval, op); atomic_set(&op->n_pages, 0); } /* |
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* release a retrieval op reference */ static void fscache_release_retrieval_op(struct fscache_operation *_op) { struct fscache_retrieval *op = container_of(_op, struct fscache_retrieval, op); _enter("{OP%x}", op->op.debug_id); |
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ASSERTIFCMP(op->op.state != FSCACHE_OP_ST_INITIALISED, atomic_read(&op->n_pages), ==, 0); |
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|
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fscache_hist(fscache_retrieval_histogram, op->start_time); if (op->context) |
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fscache_put_context(op->cookie, op->context); |
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_leave(""); } /* * allocate a retrieval op */ static struct fscache_retrieval *fscache_alloc_retrieval( |
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struct fscache_cookie *cookie, |
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struct address_space *mapping, fscache_rw_complete_t end_io_func, void *context) { struct fscache_retrieval *op; /* allocate a retrieval operation and attempt to submit it */ op = kzalloc(sizeof(*op), GFP_NOIO); if (!op) { fscache_stat(&fscache_n_retrievals_nomem); return NULL; } |
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fscache_operation_init(&op->op, NULL, fscache_do_cancel_retrieval, fscache_release_retrieval_op); |
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op->op.flags = FSCACHE_OP_MYTHREAD | (1UL << FSCACHE_OP_WAITING) | (1UL << FSCACHE_OP_UNUSE_COOKIE); |
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op->cookie = cookie; |
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op->mapping = mapping; op->end_io_func = end_io_func; op->context = context; op->start_time = jiffies; |
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INIT_LIST_HEAD(&op->to_do); |
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/* Pin the netfs read context in case we need to do the actual netfs * read because we've encountered a cache read failure. */ if (context) fscache_get_context(op->cookie, context); |
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return op; } /* * wait for a deferred lookup to complete */ |
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int fscache_wait_for_deferred_lookup(struct fscache_cookie *cookie) |
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{ unsigned long jif; _enter(""); if (!test_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags)) { _leave(" = 0 [imm]"); return 0; } fscache_stat(&fscache_n_retrievals_wait); jif = jiffies; if (wait_on_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP, |
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TASK_INTERRUPTIBLE) != 0) { fscache_stat(&fscache_n_retrievals_intr); _leave(" = -ERESTARTSYS"); return -ERESTARTSYS; } ASSERT(!test_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags)); smp_rmb(); fscache_hist(fscache_retrieval_delay_histogram, jif); _leave(" = 0 [dly]"); return 0; } /* |
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* wait for an object to become active (or dead) */ |
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int fscache_wait_for_operation_activation(struct fscache_object *object, struct fscache_operation *op, atomic_t *stat_op_waits, |
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atomic_t *stat_object_dead) |
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{ int ret; |
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if (!test_bit(FSCACHE_OP_WAITING, &op->flags)) |
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goto check_if_dead; _debug(">>> WT"); |
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if (stat_op_waits) fscache_stat(stat_op_waits); if (wait_on_bit(&op->flags, FSCACHE_OP_WAITING, |
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TASK_INTERRUPTIBLE) != 0) { |
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ret = fscache_cancel_op(op, false); |
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if (ret == 0) return -ERESTARTSYS; /* it's been removed from the pending queue by another party, * so we should get to run shortly */ |
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wait_on_bit(&op->flags, FSCACHE_OP_WAITING, |
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TASK_UNINTERRUPTIBLE); |
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} _debug("<<< GO"); check_if_dead: |
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if (op->state == FSCACHE_OP_ST_CANCELLED) { if (stat_object_dead) fscache_stat(stat_object_dead); |
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_leave(" = -ENOBUFS [cancelled]"); return -ENOBUFS; } |
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if (unlikely(fscache_object_is_dying(object) || fscache_cache_is_broken(object))) { enum fscache_operation_state state = op->state; |
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fscache_cancel_op(op, true); |
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if (stat_object_dead) fscache_stat(stat_object_dead); |
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_leave(" = -ENOBUFS [obj dead %d]", state); |
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return -ENOBUFS; } return 0; } /* |
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* read a page from the cache or allocate a block in which to store it * - we return: * -ENOMEM - out of memory, nothing done * -ERESTARTSYS - interrupted * -ENOBUFS - no backing object available in which to cache the block * -ENODATA - no data available in the backing object for this block * 0 - dispatched a read - it'll call end_io_func() when finished */ int __fscache_read_or_alloc_page(struct fscache_cookie *cookie, struct page *page, fscache_rw_complete_t end_io_func, void *context, gfp_t gfp) { struct fscache_retrieval *op; struct fscache_object *object; |
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bool wake_cookie = false; |
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int ret; _enter("%p,%p,,,", cookie, page); fscache_stat(&fscache_n_retrievals); if (hlist_empty(&cookie->backing_objects)) goto nobufs; |
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if (test_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags)) { _leave(" = -ENOBUFS [invalidating]"); return -ENOBUFS; } |
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ASSERTCMP(cookie->def->type, !=, FSCACHE_COOKIE_TYPE_INDEX); ASSERTCMP(page, !=, NULL); if (fscache_wait_for_deferred_lookup(cookie) < 0) return -ERESTARTSYS; |
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op = fscache_alloc_retrieval(cookie, page->mapping, |
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end_io_func, context); |
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if (!op) { _leave(" = -ENOMEM"); return -ENOMEM; } |
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atomic_set(&op->n_pages, 1); |
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spin_lock(&cookie->lock); |
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if (!fscache_cookie_enabled(cookie) || hlist_empty(&cookie->backing_objects)) |
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goto nobufs_unlock; object = hlist_entry(cookie->backing_objects.first, struct fscache_object, cookie_link); |
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ASSERT(test_bit(FSCACHE_OBJECT_IS_LOOKED_UP, &object->flags)); |
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|
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__fscache_use_cookie(cookie); |
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atomic_inc(&object->n_reads); |
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__set_bit(FSCACHE_OP_DEC_READ_CNT, &op->op.flags); |
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|
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if (fscache_submit_op(object, &op->op) < 0) |
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goto nobufs_unlock_dec; |
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spin_unlock(&cookie->lock); fscache_stat(&fscache_n_retrieval_ops); |
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/* we wait for the operation to become active, and then process it * *here*, in this thread, and not in the thread pool */ |
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ret = fscache_wait_for_operation_activation( object, &op->op, |
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__fscache_stat(&fscache_n_retrieval_op_waits), |
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__fscache_stat(&fscache_n_retrievals_object_dead)); |
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if (ret < 0) goto error; |
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/* ask the cache to honour the operation */ if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->cookie->flags)) { |
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fscache_stat(&fscache_n_cop_allocate_page); |
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ret = object->cache->ops->allocate_page(op, page, gfp); |
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fscache_stat_d(&fscache_n_cop_allocate_page); |
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if (ret == 0) ret = -ENODATA; } else { |
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fscache_stat(&fscache_n_cop_read_or_alloc_page); |
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ret = object->cache->ops->read_or_alloc_page(op, page, gfp); |
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fscache_stat_d(&fscache_n_cop_read_or_alloc_page); |
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} |
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error: |
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if (ret == -ENOMEM) fscache_stat(&fscache_n_retrievals_nomem); else if (ret == -ERESTARTSYS) fscache_stat(&fscache_n_retrievals_intr); else if (ret == -ENODATA) fscache_stat(&fscache_n_retrievals_nodata); else if (ret < 0) fscache_stat(&fscache_n_retrievals_nobufs); else fscache_stat(&fscache_n_retrievals_ok); fscache_put_retrieval(op); _leave(" = %d", ret); return ret; |
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nobufs_unlock_dec: atomic_dec(&object->n_reads); |
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wake_cookie = __fscache_unuse_cookie(cookie); |
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nobufs_unlock: spin_unlock(&cookie->lock); |
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if (wake_cookie) __fscache_wake_unused_cookie(cookie); |
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fscache_put_retrieval(op); |
b51088228 FS-Cache: Impleme... |
495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 |
nobufs: fscache_stat(&fscache_n_retrievals_nobufs); _leave(" = -ENOBUFS"); return -ENOBUFS; } EXPORT_SYMBOL(__fscache_read_or_alloc_page); /* * read a list of page from the cache or allocate a block in which to store * them * - we return: * -ENOMEM - out of memory, some pages may be being read * -ERESTARTSYS - interrupted, some pages may be being read * -ENOBUFS - no backing object or space available in which to cache any * pages not being read * -ENODATA - no data available in the backing object for some or all of * the pages * 0 - dispatched a read on all pages * * end_io_func() will be called for each page read from the cache as it is * finishes being read * * any pages for which a read is dispatched will be removed from pages and * nr_pages */ int __fscache_read_or_alloc_pages(struct fscache_cookie *cookie, struct address_space *mapping, struct list_head *pages, unsigned *nr_pages, fscache_rw_complete_t end_io_func, void *context, gfp_t gfp) { |
b51088228 FS-Cache: Impleme... |
528 529 |
struct fscache_retrieval *op; struct fscache_object *object; |
8fb883f3e FS-Cache: Add use... |
530 |
bool wake_cookie = false; |
b51088228 FS-Cache: Impleme... |
531 532 533 534 535 536 537 538 |
int ret; _enter("%p,,%d,,,", cookie, *nr_pages); fscache_stat(&fscache_n_retrievals); if (hlist_empty(&cookie->backing_objects)) goto nobufs; |
ef778e7ae FS-Cache: Provide... |
539 540 541 542 |
if (test_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags)) { _leave(" = -ENOBUFS [invalidating]"); return -ENOBUFS; } |
b51088228 FS-Cache: Impleme... |
543 544 545 546 547 548 |
ASSERTCMP(cookie->def->type, !=, FSCACHE_COOKIE_TYPE_INDEX); ASSERTCMP(*nr_pages, >, 0); ASSERT(!list_empty(pages)); if (fscache_wait_for_deferred_lookup(cookie) < 0) return -ERESTARTSYS; |
1362729b1 FS-Cache: Simplif... |
549 |
op = fscache_alloc_retrieval(cookie, mapping, end_io_func, context); |
b51088228 FS-Cache: Impleme... |
550 551 |
if (!op) return -ENOMEM; |
1bb4b7f98 FS-Cache: The ret... |
552 |
atomic_set(&op->n_pages, *nr_pages); |
b51088228 FS-Cache: Impleme... |
553 554 |
spin_lock(&cookie->lock); |
94d30ae90 FS-Cache: Provide... |
555 556 |
if (!fscache_cookie_enabled(cookie) || hlist_empty(&cookie->backing_objects)) |
b51088228 FS-Cache: Impleme... |
557 558 559 |
goto nobufs_unlock; object = hlist_entry(cookie->backing_objects.first, struct fscache_object, cookie_link); |
8fb883f3e FS-Cache: Add use... |
560 |
__fscache_use_cookie(cookie); |
4fbf4291a FS-Cache: Allow t... |
561 |
atomic_inc(&object->n_reads); |
9f10523f8 FS-Cache: Fix ope... |
562 |
__set_bit(FSCACHE_OP_DEC_READ_CNT, &op->op.flags); |
4fbf4291a FS-Cache: Allow t... |
563 |
|
b51088228 FS-Cache: Impleme... |
564 |
if (fscache_submit_op(object, &op->op) < 0) |
9f10523f8 FS-Cache: Fix ope... |
565 |
goto nobufs_unlock_dec; |
b51088228 FS-Cache: Impleme... |
566 567 568 |
spin_unlock(&cookie->lock); fscache_stat(&fscache_n_retrieval_ops); |
b51088228 FS-Cache: Impleme... |
569 570 |
/* we wait for the operation to become active, and then process it * *here*, in this thread, and not in the thread pool */ |
da9803bc8 FS-Cache: Add int... |
571 572 |
ret = fscache_wait_for_operation_activation( object, &op->op, |
60d543ca7 FS-Cache: Start p... |
573 |
__fscache_stat(&fscache_n_retrieval_op_waits), |
d3b97ca4a FS-Cache: The ope... |
574 |
__fscache_stat(&fscache_n_retrievals_object_dead)); |
60d543ca7 FS-Cache: Start p... |
575 576 |
if (ret < 0) goto error; |
b51088228 FS-Cache: Impleme... |
577 578 |
/* ask the cache to honour the operation */ |
52bd75fdb FS-Cache: Add cou... |
579 580 581 582 583 584 585 586 587 588 589 |
if (test_bit(FSCACHE_COOKIE_NO_DATA_YET, &object->cookie->flags)) { fscache_stat(&fscache_n_cop_allocate_pages); ret = object->cache->ops->allocate_pages( op, pages, nr_pages, gfp); fscache_stat_d(&fscache_n_cop_allocate_pages); } else { fscache_stat(&fscache_n_cop_read_or_alloc_pages); ret = object->cache->ops->read_or_alloc_pages( op, pages, nr_pages, gfp); fscache_stat_d(&fscache_n_cop_read_or_alloc_pages); } |
b51088228 FS-Cache: Impleme... |
590 |
|
5753c4418 FS-Cache: Permit ... |
591 |
error: |
b51088228 FS-Cache: Impleme... |
592 593 594 595 596 597 598 599 600 601 602 603 604 605 |
if (ret == -ENOMEM) fscache_stat(&fscache_n_retrievals_nomem); else if (ret == -ERESTARTSYS) fscache_stat(&fscache_n_retrievals_intr); else if (ret == -ENODATA) fscache_stat(&fscache_n_retrievals_nodata); else if (ret < 0) fscache_stat(&fscache_n_retrievals_nobufs); else fscache_stat(&fscache_n_retrievals_ok); fscache_put_retrieval(op); _leave(" = %d", ret); return ret; |
9f10523f8 FS-Cache: Fix ope... |
606 607 |
nobufs_unlock_dec: atomic_dec(&object->n_reads); |
8fb883f3e FS-Cache: Add use... |
608 |
wake_cookie = __fscache_unuse_cookie(cookie); |
b51088228 FS-Cache: Impleme... |
609 610 |
nobufs_unlock: spin_unlock(&cookie->lock); |
a39caadf0 FS-Cache: Put an ... |
611 |
fscache_put_retrieval(op); |
8fb883f3e FS-Cache: Add use... |
612 613 |
if (wake_cookie) __fscache_wake_unused_cookie(cookie); |
b51088228 FS-Cache: Impleme... |
614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 |
nobufs: fscache_stat(&fscache_n_retrievals_nobufs); _leave(" = -ENOBUFS"); return -ENOBUFS; } EXPORT_SYMBOL(__fscache_read_or_alloc_pages); /* * allocate a block in the cache on which to store a page * - we return: * -ENOMEM - out of memory, nothing done * -ERESTARTSYS - interrupted * -ENOBUFS - no backing object available in which to cache the block * 0 - block allocated */ int __fscache_alloc_page(struct fscache_cookie *cookie, struct page *page, gfp_t gfp) { struct fscache_retrieval *op; struct fscache_object *object; |
8fb883f3e FS-Cache: Add use... |
635 |
bool wake_cookie = false; |
b51088228 FS-Cache: Impleme... |
636 637 638 639 640 641 642 643 644 645 646 |
int ret; _enter("%p,%p,,,", cookie, page); fscache_stat(&fscache_n_allocs); if (hlist_empty(&cookie->backing_objects)) goto nobufs; ASSERTCMP(cookie->def->type, !=, FSCACHE_COOKIE_TYPE_INDEX); ASSERTCMP(page, !=, NULL); |
ef778e7ae FS-Cache: Provide... |
647 648 649 650 |
if (test_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags)) { _leave(" = -ENOBUFS [invalidating]"); return -ENOBUFS; } |
b51088228 FS-Cache: Impleme... |
651 652 |
if (fscache_wait_for_deferred_lookup(cookie) < 0) return -ERESTARTSYS; |
1362729b1 FS-Cache: Simplif... |
653 |
op = fscache_alloc_retrieval(cookie, page->mapping, NULL, NULL); |
b51088228 FS-Cache: Impleme... |
654 655 |
if (!op) return -ENOMEM; |
1bb4b7f98 FS-Cache: The ret... |
656 |
atomic_set(&op->n_pages, 1); |
b51088228 FS-Cache: Impleme... |
657 658 |
spin_lock(&cookie->lock); |
94d30ae90 FS-Cache: Provide... |
659 660 |
if (!fscache_cookie_enabled(cookie) || hlist_empty(&cookie->backing_objects)) |
b51088228 FS-Cache: Impleme... |
661 662 663 |
goto nobufs_unlock; object = hlist_entry(cookie->backing_objects.first, struct fscache_object, cookie_link); |
8fb883f3e FS-Cache: Add use... |
664 |
__fscache_use_cookie(cookie); |
b51088228 FS-Cache: Impleme... |
665 |
if (fscache_submit_op(object, &op->op) < 0) |
8fb883f3e FS-Cache: Add use... |
666 |
goto nobufs_unlock_dec; |
b51088228 FS-Cache: Impleme... |
667 668 669 |
spin_unlock(&cookie->lock); fscache_stat(&fscache_n_alloc_ops); |
da9803bc8 FS-Cache: Add int... |
670 671 |
ret = fscache_wait_for_operation_activation( object, &op->op, |
60d543ca7 FS-Cache: Start p... |
672 |
__fscache_stat(&fscache_n_alloc_op_waits), |
d3b97ca4a FS-Cache: The ope... |
673 |
__fscache_stat(&fscache_n_allocs_object_dead)); |
60d543ca7 FS-Cache: Start p... |
674 675 |
if (ret < 0) goto error; |
b51088228 FS-Cache: Impleme... |
676 677 |
/* ask the cache to honour the operation */ |
52bd75fdb FS-Cache: Add cou... |
678 |
fscache_stat(&fscache_n_cop_allocate_page); |
b51088228 FS-Cache: Impleme... |
679 |
ret = object->cache->ops->allocate_page(op, page, gfp); |
52bd75fdb FS-Cache: Add cou... |
680 |
fscache_stat_d(&fscache_n_cop_allocate_page); |
b51088228 FS-Cache: Impleme... |
681 |
|
5753c4418 FS-Cache: Permit ... |
682 683 684 685 |
error: if (ret == -ERESTARTSYS) fscache_stat(&fscache_n_allocs_intr); else if (ret < 0) |
b51088228 FS-Cache: Impleme... |
686 687 688 689 690 691 692 |
fscache_stat(&fscache_n_allocs_nobufs); else fscache_stat(&fscache_n_allocs_ok); fscache_put_retrieval(op); _leave(" = %d", ret); return ret; |
8fb883f3e FS-Cache: Add use... |
693 694 |
nobufs_unlock_dec: wake_cookie = __fscache_unuse_cookie(cookie); |
b51088228 FS-Cache: Impleme... |
695 696 |
nobufs_unlock: spin_unlock(&cookie->lock); |
a39caadf0 FS-Cache: Put an ... |
697 |
fscache_put_retrieval(op); |
8fb883f3e FS-Cache: Add use... |
698 699 |
if (wake_cookie) __fscache_wake_unused_cookie(cookie); |
b51088228 FS-Cache: Impleme... |
700 701 702 703 704 705 706 707 |
nobufs: fscache_stat(&fscache_n_allocs_nobufs); _leave(" = -ENOBUFS"); return -ENOBUFS; } EXPORT_SYMBOL(__fscache_alloc_page); /* |
5a6f282a2 fscache: Netfs fu... |
708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 |
* Unmark pages allocate in the readahead code path (via: * fscache_readpages_or_alloc) after delegating to the base filesystem */ void __fscache_readpages_cancel(struct fscache_cookie *cookie, struct list_head *pages) { struct page *page; list_for_each_entry(page, pages, lru) { if (PageFsCache(page)) __fscache_uncache_page(cookie, page); } } EXPORT_SYMBOL(__fscache_readpages_cancel); /* |
b51088228 FS-Cache: Impleme... |
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 |
* release a write op reference */ static void fscache_release_write_op(struct fscache_operation *_op) { _enter("{OP%x}", _op->debug_id); } /* * perform the background storage of a page into the cache */ static void fscache_write_op(struct fscache_operation *_op) { struct fscache_storage *op = container_of(_op, struct fscache_storage, op); struct fscache_object *object = op->op.object; |
1bccf513a FS-Cache: Fix loc... |
739 |
struct fscache_cookie *cookie; |
b51088228 FS-Cache: Impleme... |
740 741 742 743 744 745 |
struct page *page; unsigned n; void *results[1]; int ret; _enter("{OP%x,%d}", op->op.debug_id, atomic_read(&op->op.usage)); |
22f1bde5d fscache: Fix hang... |
746 |
again: |
b51088228 FS-Cache: Impleme... |
747 |
spin_lock(&object->lock); |
1bccf513a FS-Cache: Fix loc... |
748 |
cookie = object->cookie; |
b51088228 FS-Cache: Impleme... |
749 |
|
7ef001e93 FS-Cache: One of ... |
750 751 752 753 |
if (!fscache_object_is_active(object)) { /* If we get here, then the on-disk cache object likely longer * exists, so we should just cancel this write operation. */ |
b51088228 FS-Cache: Impleme... |
754 |
spin_unlock(&object->lock); |
1f372dff1 FS-Cache: Mark ca... |
755 |
fscache_op_complete(&op->op, false); |
7ef001e93 FS-Cache: One of ... |
756 757 758 759 760 761 762 763 764 765 766 767 |
_leave(" [inactive]"); return; } if (!cookie) { /* If we get here, then the cookie belonging to the object was * detached, probably by the cookie being withdrawn due to * memory pressure, which means that the pages we might write * to the cache from no longer exist - therefore, we can just * cancel this write operation. */ spin_unlock(&object->lock); |
1f372dff1 FS-Cache: Mark ca... |
768 |
fscache_op_complete(&op->op, false); |
caaef6900 FS-Cache: Fix obj... |
769 770 771 |
_leave(" [cancel] op{f=%lx s=%u} obj{s=%s f=%lx}", _op->flags, _op->state, object->state->short_name, object->flags); |
b51088228 FS-Cache: Impleme... |
772 773 |
return; } |
1bccf513a FS-Cache: Fix loc... |
774 |
spin_lock(&cookie->stores_lock); |
b51088228 FS-Cache: Impleme... |
775 776 777 778 779 780 781 782 783 784 |
fscache_stat(&fscache_n_store_calls); /* find a page to store */ page = NULL; n = radix_tree_gang_lookup_tag(&cookie->stores, results, 0, 1, FSCACHE_COOKIE_PENDING_TAG); if (n != 1) goto superseded; page = results[0]; _debug("gang %d [%lx]", n, page->index); |
b51088228 FS-Cache: Impleme... |
785 |
|
08a66859e FS-Cache: Remove ... |
786 787 788 789 |
radix_tree_tag_set(&cookie->stores, page->index, FSCACHE_COOKIE_STORING_TAG); radix_tree_tag_clear(&cookie->stores, page->index, FSCACHE_COOKIE_PENDING_TAG); |
b51088228 FS-Cache: Impleme... |
790 |
|
1bccf513a FS-Cache: Fix loc... |
791 |
spin_unlock(&cookie->stores_lock); |
b51088228 FS-Cache: Impleme... |
792 |
spin_unlock(&object->lock); |
b51088228 FS-Cache: Impleme... |
793 |
|
22f1bde5d fscache: Fix hang... |
794 795 |
if (page->index >= op->store_limit) goto discard_page; |
08a66859e FS-Cache: Remove ... |
796 797 798 799 |
fscache_stat(&fscache_n_store_pages); fscache_stat(&fscache_n_cop_write_page); ret = object->cache->ops->write_page(op, page); fscache_stat_d(&fscache_n_cop_write_page); |
08a66859e FS-Cache: Remove ... |
800 801 |
fscache_end_page_write(object, page); if (ret < 0) { |
08a66859e FS-Cache: Remove ... |
802 |
fscache_abort_object(object); |
1f372dff1 FS-Cache: Mark ca... |
803 |
fscache_op_complete(&op->op, true); |
08a66859e FS-Cache: Remove ... |
804 805 |
} else { fscache_enqueue_operation(&op->op); |
b51088228 FS-Cache: Impleme... |
806 807 808 809 |
} _leave(""); return; |
22f1bde5d fscache: Fix hang... |
810 811 812 813 |
discard_page: fscache_stat(&fscache_n_store_pages_over_limit); fscache_end_page_write(object, page); goto again; |
b51088228 FS-Cache: Impleme... |
814 815 816 817 |
superseded: /* this writer is going away and there aren't any more things to * write */ _debug("cease"); |
1bccf513a FS-Cache: Fix loc... |
818 |
spin_unlock(&cookie->stores_lock); |
b51088228 FS-Cache: Impleme... |
819 820 |
clear_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags); spin_unlock(&object->lock); |
1f372dff1 FS-Cache: Mark ca... |
821 |
fscache_op_complete(&op->op, true); |
b51088228 FS-Cache: Impleme... |
822 823 824 825 |
_leave(""); } /* |
ef778e7ae FS-Cache: Provide... |
826 827 828 829 830 831 832 833 834 |
* Clear the pages pending writing for invalidation */ void fscache_invalidate_writes(struct fscache_cookie *cookie) { struct page *page; void *results[16]; int n, i; _enter(""); |
ee8be57bc fs/fscache: remov... |
835 836 837 838 839 840 841 842 843 |
for (;;) { spin_lock(&cookie->stores_lock); n = radix_tree_gang_lookup_tag(&cookie->stores, results, 0, ARRAY_SIZE(results), FSCACHE_COOKIE_PENDING_TAG); if (n == 0) { spin_unlock(&cookie->stores_lock); break; } |
ef778e7ae FS-Cache: Provide... |
844 845 846 847 848 849 850 851 |
for (i = n - 1; i >= 0; i--) { page = results[i]; radix_tree_delete(&cookie->stores, page->index); } spin_unlock(&cookie->stores_lock); for (i = n - 1; i >= 0; i--) |
09cbfeaf1 mm, fs: get rid o... |
852 |
put_page(results[i]); |
ef778e7ae FS-Cache: Provide... |
853 |
} |
d21384552 FS-Cache: wake wr... |
854 |
wake_up_bit(&cookie->flags, 0); |
ef778e7ae FS-Cache: Provide... |
855 856 857 858 |
_leave(""); } /* |
b51088228 FS-Cache: Impleme... |
859 860 861 862 863 864 865 866 867 868 869 870 |
* request a page be stored in the cache * - returns: * -ENOMEM - out of memory, nothing done * -ENOBUFS - no backing object available in which to cache the page * 0 - dispatched a write - it'll call end_io_func() when finished * * if the cookie still has a backing object at this point, that object can be * in one of a few states with respect to storage processing: * * (1) negative lookup, object not yet created (FSCACHE_COOKIE_CREATING is * set) * |
caaef6900 FS-Cache: Fix obj... |
871 |
* (a) no writes yet |
b51088228 FS-Cache: Impleme... |
872 873 874 875 876 |
* * (b) writes deferred till post-creation (mark page for writing and * return immediately) * * (2) negative lookup, object created, initial fill being made from netfs |
b51088228 FS-Cache: Impleme... |
877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 |
* * (a) fill point not yet reached this page (mark page for writing and * return) * * (b) fill point passed this page (queue op to store this page) * * (3) object extant (queue op to store this page) * * any other state is invalid */ int __fscache_write_page(struct fscache_cookie *cookie, struct page *page, gfp_t gfp) { struct fscache_storage *op; struct fscache_object *object; |
8fb883f3e FS-Cache: Add use... |
893 |
bool wake_cookie = false; |
b51088228 FS-Cache: Impleme... |
894 895 896 897 898 899 900 901 |
int ret; _enter("%p,%x,", cookie, (u32) page->flags); ASSERTCMP(cookie->def->type, !=, FSCACHE_COOKIE_TYPE_INDEX); ASSERT(PageFsCache(page)); fscache_stat(&fscache_n_stores); |
ef778e7ae FS-Cache: Provide... |
902 903 904 905 |
if (test_bit(FSCACHE_COOKIE_INVALIDATING, &cookie->flags)) { _leave(" = -ENOBUFS [invalidating]"); return -ENOBUFS; } |
5f4f9f4af CacheFiles: Downg... |
906 |
op = kzalloc(sizeof(*op), GFP_NOIO | __GFP_NOMEMALLOC | __GFP_NORETRY); |
b51088228 FS-Cache: Impleme... |
907 908 |
if (!op) goto nomem; |
d3b97ca4a FS-Cache: The ope... |
909 |
fscache_operation_init(&op->op, fscache_write_op, NULL, |
8af7c1243 fscache: convert ... |
910 |
fscache_release_write_op); |
1362729b1 FS-Cache: Simplif... |
911 912 913 |
op->op.flags = FSCACHE_OP_ASYNC | (1 << FSCACHE_OP_WAITING) | (1 << FSCACHE_OP_UNUSE_COOKIE); |
b51088228 FS-Cache: Impleme... |
914 |
|
5e4c0d974 lib/radix-tree.c:... |
915 |
ret = radix_tree_maybe_preload(gfp & ~__GFP_HIGHMEM); |
b51088228 FS-Cache: Impleme... |
916 917 918 919 920 |
if (ret < 0) goto nomem_free; ret = -ENOBUFS; spin_lock(&cookie->lock); |
94d30ae90 FS-Cache: Provide... |
921 922 |
if (!fscache_cookie_enabled(cookie) || hlist_empty(&cookie->backing_objects)) |
b51088228 FS-Cache: Impleme... |
923 924 925 926 927 928 929 930 931 |
goto nobufs; object = hlist_entry(cookie->backing_objects.first, struct fscache_object, cookie_link); if (test_bit(FSCACHE_IOERROR, &object->cache->flags)) goto nobufs; /* add the page to the pending-storage radix tree on the backing * object */ spin_lock(&object->lock); |
1bccf513a FS-Cache: Fix loc... |
932 |
spin_lock(&cookie->stores_lock); |
b51088228 FS-Cache: Impleme... |
933 934 935 936 937 938 939 940 941 942 943 944 945 |
_debug("store limit %llx", (unsigned long long) object->store_limit); ret = radix_tree_insert(&cookie->stores, page->index, page); if (ret < 0) { if (ret == -EEXIST) goto already_queued; _debug("insert failed %d", ret); goto nobufs_unlock_obj; } radix_tree_tag_set(&cookie->stores, page->index, FSCACHE_COOKIE_PENDING_TAG); |
09cbfeaf1 mm, fs: get rid o... |
946 |
get_page(page); |
b51088228 FS-Cache: Impleme... |
947 948 949 950 951 |
/* we only want one writer at a time, but we do need to queue new * writers after exclusive ops */ if (test_and_set_bit(FSCACHE_OBJECT_PENDING_WRITE, &object->flags)) goto already_pending; |
1bccf513a FS-Cache: Fix loc... |
952 |
spin_unlock(&cookie->stores_lock); |
b51088228 FS-Cache: Impleme... |
953 954 955 956 |
spin_unlock(&object->lock); op->op.debug_id = atomic_inc_return(&fscache_op_debug_id); op->store_limit = object->store_limit; |
8fb883f3e FS-Cache: Add use... |
957 |
__fscache_use_cookie(cookie); |
b51088228 FS-Cache: Impleme... |
958 959 960 961 962 963 964 |
if (fscache_submit_op(object, &op->op) < 0) goto submit_failed; spin_unlock(&cookie->lock); radix_tree_preload_end(); fscache_stat(&fscache_n_store_ops); fscache_stat(&fscache_n_stores_ok); |
8af7c1243 fscache: convert ... |
965 |
/* the work queue now carries its own ref on the object */ |
b51088228 FS-Cache: Impleme... |
966 967 968 969 970 971 972 |
fscache_put_operation(&op->op); _leave(" = 0"); return 0; already_queued: fscache_stat(&fscache_n_stores_again); already_pending: |
1bccf513a FS-Cache: Fix loc... |
973 |
spin_unlock(&cookie->stores_lock); |
b51088228 FS-Cache: Impleme... |
974 975 976 |
spin_unlock(&object->lock); spin_unlock(&cookie->lock); radix_tree_preload_end(); |
a39caadf0 FS-Cache: Put an ... |
977 |
fscache_put_operation(&op->op); |
b51088228 FS-Cache: Impleme... |
978 979 980 981 982 |
fscache_stat(&fscache_n_stores_ok); _leave(" = 0"); return 0; submit_failed: |
1bccf513a FS-Cache: Fix loc... |
983 |
spin_lock(&cookie->stores_lock); |
b51088228 FS-Cache: Impleme... |
984 |
radix_tree_delete(&cookie->stores, page->index); |
1bccf513a FS-Cache: Fix loc... |
985 |
spin_unlock(&cookie->stores_lock); |
8fb883f3e FS-Cache: Add use... |
986 |
wake_cookie = __fscache_unuse_cookie(cookie); |
09cbfeaf1 mm, fs: get rid o... |
987 |
put_page(page); |
b51088228 FS-Cache: Impleme... |
988 989 990 991 |
ret = -ENOBUFS; goto nobufs; nobufs_unlock_obj: |
1147d0f91 fscache: add miss... |
992 |
spin_unlock(&cookie->stores_lock); |
b51088228 FS-Cache: Impleme... |
993 994 995 996 |
spin_unlock(&object->lock); nobufs: spin_unlock(&cookie->lock); radix_tree_preload_end(); |
a39caadf0 FS-Cache: Put an ... |
997 |
fscache_put_operation(&op->op); |
8fb883f3e FS-Cache: Add use... |
998 999 |
if (wake_cookie) __fscache_wake_unused_cookie(cookie); |
b51088228 FS-Cache: Impleme... |
1000 1001 1002 1003 1004 |
fscache_stat(&fscache_n_stores_nobufs); _leave(" = -ENOBUFS"); return -ENOBUFS; nomem_free: |
a39caadf0 FS-Cache: Put an ... |
1005 |
fscache_put_operation(&op->op); |
b51088228 FS-Cache: Impleme... |
1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 |
nomem: fscache_stat(&fscache_n_stores_oom); _leave(" = -ENOMEM"); return -ENOMEM; } EXPORT_SYMBOL(__fscache_write_page); /* * remove a page from the cache */ void __fscache_uncache_page(struct fscache_cookie *cookie, struct page *page) { struct fscache_object *object; _enter(",%p", page); ASSERTCMP(cookie->def->type, !=, FSCACHE_COOKIE_TYPE_INDEX); ASSERTCMP(page, !=, NULL); fscache_stat(&fscache_n_uncaches); /* cache withdrawal may beat us to it */ if (!PageFsCache(page)) goto done; /* get the object */ spin_lock(&cookie->lock); if (hlist_empty(&cookie->backing_objects)) { ClearPageFsCache(page); goto done_unlock; } object = hlist_entry(cookie->backing_objects.first, struct fscache_object, cookie_link); /* there might now be stuff on disk we could read */ clear_bit(FSCACHE_COOKIE_NO_DATA_YET, &cookie->flags); /* only invoke the cache backend if we managed to mark the page * uncached here; this deals with synchronisation vs withdrawal */ if (TestClearPageFsCache(page) && object->cache->ops->uncache_page) { /* the cache backend releases the cookie lock */ |
52bd75fdb FS-Cache: Add cou... |
1050 |
fscache_stat(&fscache_n_cop_uncache_page); |
b51088228 FS-Cache: Impleme... |
1051 |
object->cache->ops->uncache_page(object, page); |
52bd75fdb FS-Cache: Add cou... |
1052 |
fscache_stat_d(&fscache_n_cop_uncache_page); |
b51088228 FS-Cache: Impleme... |
1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 |
goto done; } done_unlock: spin_unlock(&cookie->lock); done: _leave(""); } EXPORT_SYMBOL(__fscache_uncache_page); /** |
c4d6d8dbf CacheFiles: Fix t... |
1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 |
* fscache_mark_page_cached - Mark a page as being cached * @op: The retrieval op pages are being marked for * @page: The page to be marked * * Mark a netfs page as being cached. After this is called, the netfs * must call fscache_uncache_page() to remove the mark. */ void fscache_mark_page_cached(struct fscache_retrieval *op, struct page *page) { struct fscache_cookie *cookie = op->op.object->cookie; #ifdef CONFIG_FSCACHE_STATS atomic_inc(&fscache_n_marks); #endif _debug("- mark %p{%lx}", page, page->index); if (TestSetPageFsCache(page)) { static bool once_only; if (!once_only) { once_only = true; |
36dfd116e fs/fscache: conve... |
1084 1085 1086 |
pr_warn("Cookie type %s marked page %lx multiple times ", cookie->def->name, page->index); |
c4d6d8dbf CacheFiles: Fix t... |
1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 |
} } if (cookie->def->mark_page_cached) cookie->def->mark_page_cached(cookie->netfs_data, op->mapping, page); } EXPORT_SYMBOL(fscache_mark_page_cached); /** |
b51088228 FS-Cache: Impleme... |
1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 |
* fscache_mark_pages_cached - Mark pages as being cached * @op: The retrieval op pages are being marked for * @pagevec: The pages to be marked * * Mark a bunch of netfs pages as being cached. After this is called, * the netfs must call fscache_uncache_page() to remove the mark. */ void fscache_mark_pages_cached(struct fscache_retrieval *op, struct pagevec *pagevec) { |
b51088228 FS-Cache: Impleme... |
1107 |
unsigned long loop; |
c4d6d8dbf CacheFiles: Fix t... |
1108 1109 |
for (loop = 0; loop < pagevec->nr; loop++) fscache_mark_page_cached(op, pagevec->pages[loop]); |
b51088228 FS-Cache: Impleme... |
1110 |
|
b51088228 FS-Cache: Impleme... |
1111 1112 1113 |
pagevec_reinit(pagevec); } EXPORT_SYMBOL(fscache_mark_pages_cached); |
c902ce1bf FS-Cache: Add a h... |
1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 |
/* * Uncache all the pages in an inode that are marked PG_fscache, assuming them * to be associated with the given cookie. */ void __fscache_uncache_all_inode_pages(struct fscache_cookie *cookie, struct inode *inode) { struct address_space *mapping = inode->i_mapping; struct pagevec pvec; pgoff_t next; int i; _enter("%p,%p", cookie, inode); if (!mapping || mapping->nrpages == 0) { _leave(" [no pages]"); return; } pagevec_init(&pvec, 0); next = 0; |
b307d4655 FS-Cache: Fix __f... |
1136 |
do { |
397162ffa mm: remove nr_pag... |
1137 |
if (!pagevec_lookup(&pvec, mapping, &next)) |
b307d4655 FS-Cache: Fix __f... |
1138 |
break; |
c902ce1bf FS-Cache: Add a h... |
1139 1140 |
for (i = 0; i < pagevec_count(&pvec); i++) { struct page *page = pvec.pages[i]; |
c902ce1bf FS-Cache: Add a h... |
1141 1142 1143 1144 1145 1146 1147 |
if (PageFsCache(page)) { __fscache_wait_on_page_write(cookie, page); __fscache_uncache_page(cookie, page); } } pagevec_release(&pvec); cond_resched(); |
d72dc8a25 mm: make pagevec_... |
1148 |
} while (next); |
c902ce1bf FS-Cache: Add a h... |
1149 1150 1151 1152 |
_leave(""); } EXPORT_SYMBOL(__fscache_uncache_all_inode_pages); |