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Btrfs: Add leak debugging for extent_buffer and extent_state 

This also fixes one leak around the super block when failing to mount the
FS.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-03-26 16:24:23 -04:00
parent 83041add61
commit 2d2ae54797
3 changed files with 30 additions and 3 deletions
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2
fs/btrfs/disk-io.c
View File

@ -915,12 +915,14 @@ fail_tree_root:
free_extent_buffer(tree_root->node);
fail_sb_buffer:
free_extent_buffer(fs_info->sb_buffer);
extent_io_tree_empty_lru(&BTRFS_I(fs_info->btree_inode)->io_tree);
fail_iput:
iput(fs_info->btree_inode);
fail:
close_all_devices(fs_info);
kfree(extent_root);
kfree(tree_root);
bdi_destroy(&fs_info->bdi);
kfree(fs_info);
return ERR_PTR(err);
}

28
fs/btrfs/extent_io.c
View File

@ -26,6 +26,7 @@ static struct kmem_cache *extent_buffer_cache;
static LIST_HEAD(buffers);
static LIST_HEAD(states);
static spinlock_t leak_lock = SPIN_LOCK_UNLOCKED;
#define BUFFER_LRU_MAX 64
@ -64,15 +65,22 @@ free_state_cache:
void extent_io_exit(void)
{
struct extent_state *state;
struct extent_buffer *eb;
while (!list_empty(&states)) {
state = list_entry(states.next, struct extent_state, list);
state = list_entry(states.next, struct extent_state, leak_list);
printk("state leak: start %Lu end %Lu state %lu in tree %p refs %d\n", state->start, state->end, state->state, state->tree, atomic_read(&state->refs));
list_del(&state->list);
list_del(&state->leak_list);
kmem_cache_free(extent_state_cache, state);
}
while (!list_empty(&buffers)) {
eb = list_entry(buffers.next, struct extent_buffer, leak_list);
printk("buffer leak start %Lu len %lu refs %d\n", eb->start, eb->len, atomic_read(&eb->refs));
list_del(&eb->leak_list);
kmem_cache_free(extent_buffer_cache, eb);
}
if (extent_state_cache)
kmem_cache_destroy(extent_state_cache);
if (extent_buffer_cache)
@ -109,6 +117,7 @@ EXPORT_SYMBOL(extent_io_tree_empty_lru);
struct extent_state *alloc_extent_state(gfp_t mask)
{
struct extent_state *state;
unsigned long flags;
state = kmem_cache_alloc(extent_state_cache, mask);
if (!state || IS_ERR(state))
@ -116,6 +125,9 @@ struct extent_state *alloc_extent_state(gfp_t mask)
state->state = 0;
state->private = 0;
state->tree = NULL;
spin_lock_irqsave(&leak_lock, flags);
list_add(&state->leak_list, &states);
spin_unlock_irqrestore(&leak_lock, flags);
atomic_set(&state->refs, 1);
init_waitqueue_head(&state->wq);
@ -128,7 +140,11 @@ void free_extent_state(struct extent_state *state)
if (!state)
return;
if (atomic_dec_and_test(&state->refs)) {
unsigned long flags;
WARN_ON(state->tree);
spin_lock_irqsave(&leak_lock, flags);
list_del(&state->leak_list);
spin_unlock_irqrestore(&leak_lock, flags);
kmem_cache_free(extent_state_cache, state);
}
}
@ -2582,6 +2598,7 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
gfp_t mask)
{
struct extent_buffer *eb = NULL;
unsigned long flags;
spin_lock(&tree->lru_lock);
eb = find_lru(tree, start, len);
@ -2594,6 +2611,9 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
INIT_LIST_HEAD(&eb->lru);
eb->start = start;
eb->len = len;
spin_lock_irqsave(&leak_lock, flags);
list_add(&eb->leak_list, &buffers);
spin_unlock_irqrestore(&leak_lock, flags);
atomic_set(&eb->refs, 1);
return eb;
@ -2601,6 +2621,10 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
static void __free_extent_buffer(struct extent_buffer *eb)
{
unsigned long flags;
spin_lock_irqsave(&leak_lock, flags);
list_del(&eb->leak_list);
spin_unlock_irqrestore(&leak_lock, flags);
kmem_cache_free(extent_buffer_cache, eb);
}

3
fs/btrfs/extent_io.h
View File

@ -66,7 +66,7 @@ struct extent_state {
/* for use by the FS */
u64 private;
struct list_head list;
struct list_head leak_list;
};
struct extent_buffer {
@ -80,6 +80,7 @@ struct extent_buffer {
struct list_head lru;
atomic_t refs;
int flags;
struct list_head leak_list;
};
struct extent_map_tree;