Re: [f2fs-dev] [PATCH 1/6] f2fs: call f2fs_balance_fs outside of locked page

[Chao Yu]

On 2019/12/10 6:23, Jaegeuk Kim wrote:
> Otherwise, we can hit deadlock by waiting for the locked page in
> move_data_block in GC.
> 
>  Thread A                     Thread B
>  - do_page_mkwrite
>   - f2fs_vm_page_mkwrite
>    - lock_page
>                               - f2fs_balance_fs
>                                   - mutex_lock(gc_mutex)
>                                - f2fs_gc
>                                 - do_garbage_collect
>                                  - ra_data_block
>                                   - grab_cache_page
>    - f2fs_balance_fs
>     - mutex_lock(gc_mutex)
> 
> Fixes: 39a8695824510 ("f2fs: refactor ->page_mkwrite() flow")
> Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>

Reviewed-by: Chao Yu <yuchao0@xxxxxxxxxx>

Thanks,