linux-kernel - Re: [f2fs-dev] [PATCH 1/6] f2fs: call f2fs_balance

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Message-ID: <0f842142-4931-dcb8-9843-47510851e93b@huawei.com>
Date:   Tue, 10 Dec 2019 10:09:22 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>, <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH 1/6] f2fs: call f2fs_balance_fs outside of
 locked page

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@...nel.org>

Reviewed-by: Chao Yu <yuchao0@...wei.com>

Thanks,