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| author | Chao Yu <yuchao0@huawei.com> | 2017-08-31 18:56:05 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2017-09-05 10:50:22 -0700 |
| commit | edd748e6c8e824a8281f8a8450f12c4a95ec61ee (patch) | |
| tree | 69d2f53faab82737599b1c93534721c716f214ff /mm | |
| parent | 025d63a486aad611b20fa39184fc86e4b76d260e (diff) | |
f2fs: avoid race in between atomic_read & atomic_inc
Previously, we will miss merging flush command during fsync due to below
race condition:
Thread A Thread B Thread C
- f2fs_issue_flush
- atomic_read(&issing_flush)
- f2fs_issue_flush
- atomic_read(&issing_flush)
- f2fs_issue_flush
- atomic_read(&issing_flush)
- atomic_inc(&issing_flush)
- atomic_inc(&issing_flush)
- atomic_inc(&issing_flush)
- submit_flush_wait
- submit_flush_wait
- submit_flush_wait
It needs to use atomic_inc_return instead to avoid such race.
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'mm')
0 files changed, 0 insertions, 0 deletions