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btrfs: make the extent buffer leak check per fs info

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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: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2020-02-14 16:11:40 -05:00 committed by David Sterba
parent 7b7b74315b
commit 3fd6372758
4 changed files with 36 additions and 22 deletions
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3
fs/btrfs/ctree.h
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@ -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
};

3
fs/btrfs/disk-io.c
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@ -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,

45
fs/btrfs/extent_io.c
View File

@ -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);

7
fs/btrfs/extent_io.h
View File

@ -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