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fs: buffer lock use lock bitops 

trylock_buffer and unlock_buffer open and close a critical section.
Hence, we can use the lock bitops to get the desired memory ordering.

Signed-off-by: Nick Piggin <npiggin@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin 2008-10-18 20:27:00 -07:00 committed by Linus Torvalds
parent 8413ac9d8c
commit 51b07fc3c5
2 changed files with 2 additions and 3 deletions
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3
fs/buffer.c
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@ -76,8 +76,7 @@ EXPORT_SYMBOL(__lock_buffer);
void unlock_buffer(struct buffer_head *bh)
{
smp_mb__before_clear_bit();
clear_buffer_locked(bh);
clear_bit_unlock(BH_Lock, &bh->b_state);
smp_mb__after_clear_bit();
wake_up_bit(&bh->b_state, BH_Lock);
}

2
include/linux/buffer_head.h
View File

@ -322,7 +322,7 @@ static inline void wait_on_buffer(struct buffer_head *bh)
static inline int trylock_buffer(struct buffer_head *bh)
{
return likely(!test_and_set_bit(BH_Lock, &bh->b_state));
return likely(!test_and_set_bit_lock(BH_Lock, &bh->b_state));
}
static inline void lock_buffer(struct buffer_head *bh)