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btrfs: move leak debug code to functions

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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
2013-04-22 16:12:31 +00:00
committed by Josef Bacik
parent ace68bac61
commit 6d49ba1b47
3 changed files with 72 additions and 56 deletions
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113
fs/btrfs/extent_io.c
View File

@ -24,12 +24,62 @@
static struct kmem_cache *extent_state_cache;
static struct kmem_cache *extent_buffer_cache;
#ifdef CONFIG_BTRFS_DEBUG
static LIST_HEAD(buffers);
static LIST_HEAD(states);
#define LEAK_DEBUG 0
#if LEAK_DEBUG
static DEFINE_SPINLOCK(leak_lock);
static inline
void btrfs_leak_debug_add(struct list_head *new, struct list_head *head)
{
unsigned long flags;
spin_lock_irqsave(&leak_lock, flags);
list_add(new, head);
spin_unlock_irqrestore(&leak_lock, flags);
}
static inline
void btrfs_leak_debug_del(struct list_head *entry)
{
unsigned long flags;
spin_lock_irqsave(&leak_lock, flags);
list_del(entry);
spin_unlock_irqrestore(&leak_lock, flags);
}
static inline
void btrfs_leak_debug_check(void)
{
struct extent_state *state;
struct extent_buffer *eb;
while (!list_empty(&states)) {
state = list_entry(states.next, struct extent_state, leak_list);
printk(KERN_ERR "btrfs state leak: start %llu end %llu "
"state %lu in tree %p refs %d\n",
(unsigned long long)state->start,
(unsigned long long)state->end,
state->state, state->tree, atomic_read(&state->refs));
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(KERN_ERR "btrfs buffer leak start %llu len %lu "
"refs %d\n", (unsigned long long)eb->start,
eb->len, atomic_read(&eb->refs));
list_del(&eb->leak_list);
kmem_cache_free(extent_buffer_cache, eb);
}
}
#else
#define btrfs_leak_debug_add(new, head) do {} while (0)
#define btrfs_leak_debug_del(entry) do {} while (0)
#define btrfs_leak_debug_check() do {} while (0)
#endif
#define BUFFER_LRU_MAX 64
@ -84,29 +134,7 @@ 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, leak_list);
printk(KERN_ERR "btrfs state leak: start %llu end %llu "
"state %lu in tree %p refs %d\n",
(unsigned long long)state->start,
(unsigned long long)state->end,
state->state, state->tree, atomic_read(&state->refs));
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(KERN_ERR "btrfs buffer leak start %llu len %lu "
"refs %d\n", (unsigned long long)eb->start,
eb->len, atomic_read(&eb->refs));
list_del(&eb->leak_list);
kmem_cache_free(extent_buffer_cache, eb);
}
btrfs_leak_debug_check();
/*
* Make sure all delayed rcu free are flushed before we
@ -134,9 +162,6 @@ void extent_io_tree_init(struct extent_io_tree *tree,
static struct extent_state *alloc_extent_state(gfp_t mask)
{
struct extent_state *state;
#if LEAK_DEBUG
unsigned long flags;
#endif
state = kmem_cache_alloc(extent_state_cache, mask);
if (!state)
@ -144,11 +169,7 @@ static struct extent_state *alloc_extent_state(gfp_t mask)
state->state = 0;
state->private = 0;
state->tree = NULL;
#if LEAK_DEBUG
spin_lock_irqsave(&leak_lock, flags);
list_add(&state->leak_list, &states);
spin_unlock_irqrestore(&leak_lock, flags);
#endif
btrfs_leak_debug_add(&state->leak_list, &states);
atomic_set(&state->refs, 1);
init_waitqueue_head(&state->wq);
trace_alloc_extent_state(state, mask, _RET_IP_);
@ -160,15 +181,8 @@ void free_extent_state(struct extent_state *state)
if (!state)
return;
if (atomic_dec_and_test(&state->refs)) {
#if LEAK_DEBUG
unsigned long flags;
#endif
WARN_ON(state->tree);
#if LEAK_DEBUG
spin_lock_irqsave(&leak_lock, flags);
list_del(&state->leak_list);
spin_unlock_irqrestore(&leak_lock, flags);
#endif
btrfs_leak_debug_del(&state->leak_list);
trace_free_extent_state(state, _RET_IP_);
kmem_cache_free(extent_state_cache, state);
}
@ -4065,12 +4079,7 @@ out:
static void __free_extent_buffer(struct extent_buffer *eb)
{
#if LEAK_DEBUG
unsigned long flags;
spin_lock_irqsave(&leak_lock, flags);
list_del(&eb->leak_list);
spin_unlock_irqrestore(&leak_lock, flags);
#endif
btrfs_leak_debug_del(&eb->leak_list);
kmem_cache_free(extent_buffer_cache, eb);
}
@ -4080,9 +4089,6 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
gfp_t mask)
{
struct extent_buffer *eb = NULL;
#if LEAK_DEBUG
unsigned long flags;
#endif
eb = kmem_cache_zalloc(extent_buffer_cache, mask);
if (eb == NULL)
@ -4102,11 +4108,8 @@ static struct extent_buffer *__alloc_extent_buffer(struct extent_io_tree *tree,
init_waitqueue_head(&eb->write_lock_wq);
init_waitqueue_head(&eb->read_lock_wq);
#if LEAK_DEBUG
spin_lock_irqsave(&leak_lock, flags);
list_add(&eb->leak_list, &buffers);
spin_unlock_irqrestore(&leak_lock, flags);
#endif
btrfs_leak_debug_add(&eb->leak_list, &buffers);
spin_lock_init(&eb->refs_lock);
atomic_set(&eb->refs, 1);
atomic_set(&eb->io_pages, 0);