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Commit ef6dae6e authored by Andrew Morton's avatar Andrew Morton Committed by James Toy
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Detect bh refcount underflows. 

Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 5658ecb4
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Showing with 9 additions and 5 deletions
fs/buffer.c
View file @ ef6dae6e
...@@ -46,6 +46,14 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list); ...@@ -46,6 +46,14 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list);
#define BH_ENTRY(list) list_entry((list), struct buffer_head, b_assoc_buffers) #define BH_ENTRY(list) list_entry((list), struct buffer_head, b_assoc_buffers)
void put_bh(struct buffer_head *bh)
{
WARN_ON(atomic_read(&bh->b_count) <= 0);
smp_mb__before_atomic_dec();
atomic_dec(&bh->b_count);
}
EXPORT_SYMBOL(put_bh);
inline void inline void
init_buffer(struct buffer_head *bh, bh_end_io_t *handler, void *private) init_buffer(struct buffer_head *bh, bh_end_io_t *handler, void *private)
{ {
......
include/linux/buffer_head.h
View file @ ef6dae6e
...@@ -254,11 +254,7 @@ static inline void get_bh(struct buffer_head *bh) ...@@ -254,11 +254,7 @@ static inline void get_bh(struct buffer_head *bh)
atomic_inc(&bh->b_count); atomic_inc(&bh->b_count);
} }
static inline void put_bh(struct buffer_head *bh) void put_bh(struct buffer_head *bh);
{
smp_mb__before_atomic_dec();
atomic_dec(&bh->b_count);
}
static inline void brelse(struct buffer_head *bh) static inline void brelse(struct buffer_head *bh)
{ {
......
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