Commit 3fd63727 authored by Josef Bacik's avatar Josef Bacik Committed by David Sterba
Browse files

btrfs: make the extent buffer leak check per fs info 



I'm going to make the entire destruction of btrfs_root's controlled by
their refcount, so it will be helpful to notice if we're leaking their
eb's on umount.

Signed-off-by: default avatarJosef Bacik <josef@toxicpanda.com>
Reviewed-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
parent 7b7b7431

fs/btrfs/ctree.h

+3 −0
Original line number Diff line number Diff line
@@ -949,6 +949,9 @@ struct btrfs_fs_info { 
	struct kobject *debug_kobj;

	struct kobject *discard_debug_kobj;

	struct list_head allocated_roots;



	spinlock_t eb_leak_lock;

	struct list_head allocated_ebs;

#endif

};

fs/btrfs/disk-io.c

+3 −0
Original line number Diff line number Diff line
@@ -1530,6 +1530,7 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info) 
	btrfs_put_root(fs_info->free_space_root);

	btrfs_put_root(fs_info->fs_root);

	btrfs_check_leaked_roots(fs_info);

	btrfs_extent_buffer_leak_debug_check(fs_info);

	kfree(fs_info->super_copy);

	kfree(fs_info->super_for_commit);

	kvfree(fs_info);
@@ -2656,6 +2657,8 @@ void btrfs_init_fs_info(struct btrfs_fs_info *fs_info) 
	INIT_LIST_HEAD(&fs_info->unused_bgs);

#ifdef CONFIG_BTRFS_DEBUG

	INIT_LIST_HEAD(&fs_info->allocated_roots);

	INIT_LIST_HEAD(&fs_info->allocated_ebs);

	spin_lock_init(&fs_info->eb_leak_lock);

#endif

	extent_map_tree_init(&fs_info->mapping_tree);

	btrfs_init_block_rsv(&fs_info->global_block_rsv,

fs/btrfs/extent_io.c

+23 −22
Original line number Diff line number Diff line
@@ -35,42 +35,45 @@ static inline bool extent_state_in_tree(const struct extent_state *state) 
}



#ifdef CONFIG_BTRFS_DEBUG

static LIST_HEAD(buffers);

static LIST_HEAD(states);



static DEFINE_SPINLOCK(leak_lock);



static inline

void btrfs_leak_debug_add(struct list_head *new, struct list_head *head)

static inline void btrfs_leak_debug_add(spinlock_t *lock,

					struct list_head *new,

					struct list_head *head)

{

	unsigned long flags;



	spin_lock_irqsave(&leak_lock, flags);

	spin_lock_irqsave(lock, flags);

	list_add(new, head);

	spin_unlock_irqrestore(&leak_lock, flags);

	spin_unlock_irqrestore(lock, flags);

}



static inline

void btrfs_leak_debug_del(struct list_head *entry)

static inline void btrfs_leak_debug_del(spinlock_t *lock,

					struct list_head *entry)

{

	unsigned long flags;



	spin_lock_irqsave(&leak_lock, flags);

	spin_lock_irqsave(lock, flags);

	list_del(entry);

	spin_unlock_irqrestore(&leak_lock, flags);

	spin_unlock_irqrestore(lock, flags);

}



static inline void btrfs_extent_buffer_leak_debug_check(void)

void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info)

{

	struct extent_buffer *eb;

	unsigned long flags;



	while (!list_empty(&buffers)) {

		eb = list_entry(buffers.next, struct extent_buffer, leak_list);

	spin_lock_irqsave(&fs_info->eb_leak_lock, flags);

	while (!list_empty(&fs_info->allocated_ebs)) {

		eb = list_first_entry(&fs_info->allocated_ebs,

				      struct extent_buffer, leak_list);

		pr_err("BTRFS: buffer leak start %llu len %lu refs %d bflags %lu\n",

		       eb->start, eb->len, atomic_read(&eb->refs), eb->bflags);

		list_del(&eb->leak_list);

		kmem_cache_free(extent_buffer_cache, eb);

	}

	spin_unlock_irqrestore(&fs_info->eb_leak_lock, flags);

}



static inline void btrfs_extent_state_leak_debug_check(void)
@@ -107,9 +110,8 @@ static inline void __btrfs_debug_check_extent_io_range(const char *caller, 
	}

}

#else

#define btrfs_leak_debug_add(new, head)	do {} while (0)

#define btrfs_leak_debug_del(entry)	do {} while (0)

#define btrfs_extent_buffer_leak_debug_check()	do {} while (0)

#define btrfs_leak_debug_add(lock, new, head)	do {} while (0)

#define btrfs_leak_debug_del(lock, entry)	do {} while (0)

#define btrfs_extent_state_leak_debug_check()	do {} while (0)

#define btrfs_debug_check_extent_io_range(c, s, e)	do {} while (0)

#endif
@@ -245,8 +247,6 @@ void __cold extent_state_cache_exit(void) 


void __cold extent_io_exit(void)

{

	btrfs_extent_buffer_leak_debug_check();



	/*

	 * Make sure all delayed rcu free are flushed before we

	 * destroy caches.
@@ -324,7 +324,7 @@ static struct extent_state *alloc_extent_state(gfp_t mask) 
	state->state = 0;

	state->failrec = NULL;

	RB_CLEAR_NODE(&state->rb_node);

	btrfs_leak_debug_add(&state->leak_list, &states);

	btrfs_leak_debug_add(&leak_lock, &state->leak_list, &states);

	refcount_set(&state->refs, 1);

	init_waitqueue_head(&state->wq);

	trace_alloc_extent_state(state, mask, _RET_IP_);
@@ -337,7 +337,7 @@ void free_extent_state(struct extent_state *state) 
		return;

	if (refcount_dec_and_test(&state->refs)) {

		WARN_ON(extent_state_in_tree(state));

		btrfs_leak_debug_del(&state->leak_list);

		btrfs_leak_debug_del(&leak_lock, &state->leak_list);

		trace_free_extent_state(state, _RET_IP_);

		kmem_cache_free(extent_state_cache, state);

	}
@@ -4875,7 +4875,7 @@ out_free_ulist: 


static void __free_extent_buffer(struct extent_buffer *eb)

{

	btrfs_leak_debug_del(&eb->leak_list);

	btrfs_leak_debug_del(&eb->fs_info->eb_leak_lock, &eb->leak_list);

	kmem_cache_free(extent_buffer_cache, eb);

}
@@ -4962,7 +4962,8 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, 
	init_waitqueue_head(&eb->write_lock_wq);

	init_waitqueue_head(&eb->read_lock_wq);



	btrfs_leak_debug_add(&eb->leak_list, &buffers);

	btrfs_leak_debug_add(&fs_info->eb_leak_lock, &eb->leak_list,

			     &fs_info->allocated_ebs);



	spin_lock_init(&eb->refs_lock);

	atomic_set(&eb->refs, 1);

fs/btrfs/extent_io.h

+7 −0
Original line number Diff line number Diff line
@@ -325,4 +325,11 @@ bool find_lock_delalloc_range(struct inode *inode, 
#endif

struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info,

					       u64 start);



#ifdef CONFIG_BTRFS_DEBUG

void btrfs_extent_buffer_leak_debug_check(struct btrfs_fs_info *fs_info);

#else

#define btrfs_extent_buffer_leak_debug_check(fs_info)	do {} while (0)

#endif



#endif

CRA Git | Maintained and supported by SUSTech CRA and CCSE