diff options
| author | Andrew Morton <akpm@osdl.org> | 2004-05-14 05:42:34 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2004-05-14 05:42:34 -0700 |
| commit | 70d1f017811daab3cdf75d69fa1e37b1a08f4bb8 (patch) | |
| tree | 066e6289ef3f7fdaf6b9a080466f8352c2e80dba /include/linux/buffer_head.h | |
| parent | 08aaf1cc54e61c4357828f7d029f9446144d0cc7 (diff) | |
[PATCH] filtered wakeups: apply to buffer_head functions
From: William Lee Irwin III <wli@holomorphy.com>
This patch implements wake-one semantics for buffer_head wakeups in a single
step. The buffer_head being waited on is passed to the waiter's wakeup
function by the waker, and the wakeup function compares that to the a pointer
stored in its on-stack structure and checking the readiness of the bit there
also. Wake-one semantics are achieved by using WQ_FLAG_EXCLUSIVE in the
codepaths waiting to acquire the bit for mutual exclusion.
Diffstat (limited to 'include/linux/buffer_head.h')
| -rw-r--r-- | include/linux/buffer_head.h | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h index 99cb4139354b..6d70bd5393e6 100644 --- a/include/linux/buffer_head.h +++ b/include/linux/buffer_head.h @@ -170,6 +170,7 @@ struct buffer_head *__bread(struct block_device *, sector_t block, int size); struct buffer_head *alloc_buffer_head(int gfp_flags); void free_buffer_head(struct buffer_head * bh); void FASTCALL(unlock_buffer(struct buffer_head *bh)); +void FASTCALL(__lock_buffer(struct buffer_head *bh)); void ll_rw_block(int, int, struct buffer_head * bh[]); void sync_dirty_buffer(struct buffer_head *bh); void submit_bh(int, struct buffer_head *); @@ -279,8 +280,8 @@ static inline void wait_on_buffer(struct buffer_head *bh) static inline void lock_buffer(struct buffer_head *bh) { - while (test_set_buffer_locked(bh)) - __wait_on_buffer(bh); + if (test_set_buffer_locked(bh)) + __lock_buffer(bh); } #endif /* _LINUX_BUFFER_HEAD_H */ |