Re: [f2fs-dev] [PATCH v2] f2fs: add a rw_sem to cover quota flag changes

[Chao Yu]

On 2019/5/31 1:57, Jaegeuk Kim wrote:
> thread 1:                        thread 2:
> writeback                        checkpoint
> set QUOTA_NEED_FLUSH
>                                  clear QUOTA_NEED_FLUSH
> f2fs_dquot_commit
> dquot_commit
> clear_dquot_dirty
>                                  f2fs_quota_sync
>                                  dquot_writeback_dquots
> 				 nothing to commit
> commit_dqblk
> quota_write
> f2fs_quota_write
> waiting for f2fs_lock_op()
> 				 pass __need_flush_quota
>                                  (no F2FS_DIRTY_QDATA)
> 
> -> up-to-date quota is not written
> 
> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>

Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>

Thanks,