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>
diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
index 0f5374c..2b3b832 100644
--- a/fs/btrfs/Kconfig
+++ b/fs/btrfs/Kconfig
@@ -63,3 +63,12 @@
If unsure, say N.
+config BTRFS_DEBUG
+ bool "Btrfs debugging support"
+ depends on BTRFS_FS
+ help
+ Enable run-time debugging support for the btrfs filesystem. This may
+ enable additional and expensive checks with negative impact on
+ performance, or export extra information via sysfs.
+
+ If unsure, say N.
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index d9a82f2..f110d12 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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 @@
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);
diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h
index fa86861..59d883b 100644
--- a/fs/btrfs/extent_io.h
+++ b/fs/btrfs/extent_io.h
@@ -116,7 +116,9 @@
/* for use by the FS */
u64 private;
+#ifdef CONFIG_BTRFS_DEBUG
struct list_head leak_list;
+#endif
};
#define INLINE_EXTENT_BUFFER_PAGES 16
@@ -132,7 +134,6 @@
atomic_t refs;
atomic_t io_pages;
int read_mirror;
- struct list_head leak_list;
struct rcu_head rcu_head;
pid_t lock_owner;
@@ -159,6 +160,9 @@
wait_queue_head_t read_lock_wq;
wait_queue_head_t lock_wq;
struct page *pages[INLINE_EXTENT_BUFFER_PAGES];
+#ifdef CONFIG_BTRFS_DEBUG
+ struct list_head leak_list;
+#endif
};
static inline void extent_set_compress_type(unsigned long *bio_flags,