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f2fs: use wq_has_sleeper for cp_wait wait_queue

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We need to use wq_has_sleeper including smp_mb to consider cp_wait concurrency.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2016-01-26 11:55:35 -08:00
parent 50e5d0bc0b
commit 5cb608f866
2 changed files with 22 additions and 2 deletions
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3
fs/f2fs/data.c
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@ -75,8 +75,7 @@ static void f2fs_write_end_io(struct bio *bio, int err)
dec_page_count(sbi, F2FS_WRITEBACK);
}
if (!get_pages(sbi, F2FS_WRITEBACK) &&
!list_empty(&sbi->cp_wait.task_list))
if (!get_pages(sbi, F2FS_WRITEBACK) && wq_has_sleeper(&sbi->cp_wait))
wake_up(&sbi->cp_wait);
bio_put(bio);

21
fs/f2fs/f2fs.h
View file

@ -105,6 +105,27 @@ static inline bool f2fs_crc_valid(__u32 blk_crc, void *buf, size_t buf_size)
return f2fs_crc32(buf, buf_size) == blk_crc;
}
/**
* wq_has_sleeper - check if there are any waiting processes
* @wq: wait queue head
*
* Returns true if wq has waiting processes
*
* Please refer to the comment for waitqueue_active.
*/
static inline bool wq_has_sleeper(wait_queue_head_t *wq)
{
/*
* We need to be sure we are in sync with the
* add_wait_queue modifications to the wait queue.
*
* This memory barrier should be paired with one on the
* waiting side.
*/
smp_mb();
return waitqueue_active(wq);
}
/*
* For checkpoint manager
*/