forked from Minki/linux
btrfs: move leak debug code to functions
Clean up the leak debugging in extent_io.c by moving the debug code into functions. This also removes the list_heads used for debugging from the extent_buffer and extent_state structures when debug is not enabled. Since we need a global debug config to do that last part, implement CONFIG_BTRFS_DEBUG to accommodate. Thanks to Dave Sterba for the Kconfig bit. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Reviewed-by: David Sterba <dsterba@suse.cz> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
This commit is contained in:
Eric Sandeen
Josef Bacik
parent
ace68bac61
commit
6d49ba1b47
@ -63,3 +63,12 @@ config BTRFS_FS_RUN_SANITY_TESTS
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If unsure, say N.
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config BTRFS_DEBUG
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bool "Btrfs debugging support"
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depends on BTRFS_FS
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help
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Enable run-time debugging support for the btrfs filesystem. This may
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enable additional and expensive checks with negative impact on
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performance, or export extra information via sysfs.
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If unsure, say N.
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@ -24,12 +24,62 @@
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static struct kmem_cache *extent_state_cache;
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static struct kmem_cache *extent_buffer_cache;
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#ifdef CONFIG_BTRFS_DEBUG
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static LIST_HEAD(buffers);
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static LIST_HEAD(states);
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#define LEAK_DEBUG 0
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#if LEAK_DEBUG
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static DEFINE_SPINLOCK(leak_lock);
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static inline
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void btrfs_leak_debug_add(struct list_head *new, struct list_head *head)
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{
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unsigned long flags;
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spin_lock_irqsave(&leak_lock, flags);
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list_add(new, head);
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spin_unlock_irqrestore(&leak_lock, flags);
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}
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static inline
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void btrfs_leak_debug_del(struct list_head *entry)
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{
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unsigned long flags;
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spin_lock_irqsave(&leak_lock, flags);
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list_del(entry);
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spin_unlock_irqrestore(&leak_lock, flags);
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}
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static inline
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void btrfs_leak_debug_check(void)
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{
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struct extent_state *state;
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struct extent_buffer *eb;
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while (!list_empty(&states)) {
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state = list_entry(states.next, struct extent_state, leak_list);
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printk(KERN_ERR "btrfs state leak: start %llu end %llu "
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"state %lu in tree %p refs %d\n",
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(unsigned long long)state->start,
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(unsigned long long)state->end,
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state->state, state->tree, atomic_read(&state->refs));
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list_del(&state->leak_list);
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kmem_cache_free(extent_state_cache, state);
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}
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while (!list_empty(&buffers)) {
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eb = list_entry(buffers.next, struct extent_buffer, leak_list);
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printk(KERN_ERR "btrfs buffer leak start %llu len %lu "
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"refs %d\n", (unsigned long long)eb->start,
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eb->len, atomic_read(&eb->refs));
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list_del(&eb->leak_list);
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kmem_cache_free(extent_buffer_cache, eb);
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}
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}
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#else
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#define btrfs_leak_debug_add(new, head) do {} while (0)
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#define btrfs_leak_debug_del(entry) do {} while (0)
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#define btrfs_leak_debug_check() do {} while (0)
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#endif
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#define BUFFER_LRU_MAX 64
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@ -84,29 +134,7 @@ free_state_cache:
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void extent_io_exit(void)
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{
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struct extent_state *state;
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struct extent_buffer *eb;
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while (!list_empty(&states)) {
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state = list_entry(states.next, struct extent_state, leak_list);
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printk(KERN_ERR "btrfs state leak: start %llu end %llu "
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"state %lu in tree %p refs %d\n",
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(unsigned long long)state->start,
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(unsigned long long)state->end,
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state->state, state->tree, atomic_read(&state->refs));
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list_del(&state->leak_list);
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kmem_cache_free(extent_state_cache, state);
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}
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while (!list_empty(&buffers)) {
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eb = list_entry(buffers.next, struct extent_buffer, leak_list);
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printk(KERN_ERR "btrfs buffer leak start %llu len %lu "
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"refs %d\n", (unsigned long long)eb->start,
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eb->len, atomic_read(&eb->refs));
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list_del(&eb->leak_list);
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kmem_cache_free(extent_buffer_cache, eb);
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}
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btrfs_leak_debug_check();
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/*
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* Make sure all delayed rcu free are flushed before we
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@ -134,9 +162,6 @@ void extent_io_tree_init(struct extent_io_tree *tree,
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static struct extent_state *alloc_extent_state(gfp_t mask)
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{
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struct extent_state *state;
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#if LEAK_DEBUG
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unsigned long flags;
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#endif
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state = kmem_cache_alloc(extent_state_cache, mask);
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if (!state)
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@ -144,11 +169,7 @@ static struct extent_state *alloc_extent_state(gfp_t mask)
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state->state = 0;
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state->private = 0;
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state->tree = NULL;
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#if LEAK_DEBUG
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spin_lock_irqsave(&leak_lock, flags);
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list_add(&state->leak_list, &states);
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spin_unlock_irqrestore(&leak_lock, flags);
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#endif
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btrfs_leak_debug_add(&state->leak_list, &states);
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atomic_set(&state->refs, 1);
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init_waitqueue_head(&state->wq);
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trace_alloc_extent_state(state, mask, _RET_IP_);
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@ -160,15 +181,8 @@ void free_extent_state(struct extent_state *state)
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if (!state)
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return;
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if (atomic_dec_and_test(&state->refs)) {
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#if LEAK_DEBUG
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unsigned long flags;
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#endif
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WARN_ON(state->tree);
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#if LEAK_DEBUG
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spin_lock_irqsave(&leak_lock, flags);
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list_del(&state->leak_list);
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spin_unlock_irqrestore(&leak_lock, flags);
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#endif
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btrfs_leak_debug_del(&state->leak_list);
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trace_free_extent_state(state, _RET_IP_);
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kmem_cache_free(extent_state_cache, state);
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}
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@ -4065,12 +4079,7 @@ out:
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static void __free_extent_buffer(struct extent_buffer *eb)
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{
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#if LEAK_DEBUG
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unsigned long flags;
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spin_lock_irqsave(&leak_lock, flags);
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list_del(&eb->leak_list);
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spin_unlock_irqrestore(&leak_lock, flags);
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#endif
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btrfs_leak_debug_del(&eb->leak_list);
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kmem_cache_free(extent_buffer_cache, eb);
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}
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@ -4080,9 +4089,6 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
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gfp_t mask)
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{
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struct extent_buffer *eb = NULL;
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#if LEAK_DEBUG
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unsigned long flags;
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#endif
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eb = kmem_cache_zalloc(extent_buffer_cache, mask);
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if (eb == NULL)
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@ -4102,11 +4108,8 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
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init_waitqueue_head(&eb->write_lock_wq);
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init_waitqueue_head(&eb->read_lock_wq);
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#if LEAK_DEBUG
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spin_lock_irqsave(&leak_lock, flags);
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list_add(&eb->leak_list, &buffers);
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spin_unlock_irqrestore(&leak_lock, flags);
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#endif
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btrfs_leak_debug_add(&eb->leak_list, &buffers);
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spin_lock_init(&eb->refs_lock);
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atomic_set(&eb->refs, 1);
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atomic_set(&eb->io_pages, 0);
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@ -116,7 +116,9 @@ struct extent_state {
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/* for use by the FS */
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u64 private;
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#ifdef CONFIG_BTRFS_DEBUG
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struct list_head leak_list;
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#endif
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};
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#define INLINE_EXTENT_BUFFER_PAGES 16
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@ -132,7 +134,6 @@ struct extent_buffer {
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atomic_t refs;
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atomic_t io_pages;
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int read_mirror;
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struct list_head leak_list;
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struct rcu_head rcu_head;
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pid_t lock_owner;
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@ -159,6 +160,9 @@ struct extent_buffer {
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wait_queue_head_t read_lock_wq;
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wait_queue_head_t lock_wq;
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struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
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#ifdef CONFIG_BTRFS_DEBUG
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struct list_head leak_list;
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#endif
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};
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static inline void extent_set_compress_type(unsigned long *bio_flags,
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