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| author | Jens Axboe <jens.axboe@oracle.com> | 2009-07-09 14:52:32 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@carl.(none)> | 2009-07-10 20:31:53 +0200 |
| commit | 8aa7e847d834ed937a9ad37a0f2ad5b8584c1ab0 (patch) | |
| tree | 76c8b4f1362a928d426f2201790ab5d128f57724 /mm/backing-dev.c | |
| parent | c2cc49a2f8a479dde96a599646d30b6cc9dbed78 (diff) | |
| download | blackbird-op-linux-8aa7e847d834ed937a9ad37a0f2ad5b8584c1ab0.tar.gz blackbird-op-linux-8aa7e847d834ed937a9ad37a0f2ad5b8584c1ab0.zip | |
Fix congestion_wait() sync/async vs read/write confusion
Commit 1faa16d22877f4839bd433547d770c676d1d964c accidentally broke
the bdi congestion wait queue logic, causing us to wait on congestion
for WRITE (== 1) when we really wanted BLK_RW_ASYNC (== 0) instead.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'mm/backing-dev.c')
| -rw-r--r-- | mm/backing-dev.c | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/mm/backing-dev.c b/mm/backing-dev.c index 493b468a5035..c86edd244294 100644 --- a/mm/backing-dev.c +++ b/mm/backing-dev.c @@ -283,7 +283,6 @@ static wait_queue_head_t congestion_wqh[2] = { __WAIT_QUEUE_HEAD_INITIALIZER(congestion_wqh[1]) }; - void clear_bdi_congested(struct backing_dev_info *bdi, int sync) { enum bdi_state bit; @@ -308,18 +307,18 @@ EXPORT_SYMBOL(set_bdi_congested); /** * congestion_wait - wait for a backing_dev to become uncongested - * @rw: READ or WRITE + * @sync: SYNC or ASYNC IO * @timeout: timeout in jiffies * * Waits for up to @timeout jiffies for a backing_dev (any backing_dev) to exit * write congestion. If no backing_devs are congested then just wait for the * next write to be completed. */ -long congestion_wait(int rw, long timeout) +long congestion_wait(int sync, long timeout) { long ret; DEFINE_WAIT(wait); - wait_queue_head_t *wqh = &congestion_wqh[rw]; + wait_queue_head_t *wqh = &congestion_wqh[sync]; prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE); ret = io_schedule_timeout(timeout); |
