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Subject: Re: [f2fs-dev] [PATCH] f2fs: fix potential deadlock in gc_merge path
 of
 f2fs_balance_fs()
From: patchwork-bot+f2fs@kernel.org
Message-Id: 
 <177942420913.624124.6855697995437487075.git-patchwork-notify@kernel.org>
Date: Fri, 22 May 2026 04:30:09 +0000
References: <20260519011438.1168155-1-chao@kernel.org>
In-Reply-To: <20260519011438.1168155-1-chao@kernel.org>
To: Chao Yu <chao@kernel.org>
Cc: jaegeuk@kernel.org, chaseyu@google.com, ruipengqi3@gmail.com,
 linux-kernel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net,
 stable@kernel.org

Hello:

This patch was applied to jaegeuk/f2fs.git (dev)
by Jaegeuk Kim <jaegeuk@kernel.org>:

On Tue, 19 May 2026 01:14:38 +0000 you wrote:
> When we mount device w/ gc_merge mount option, we may suffer below
> potential deadlock:
> 
> Kworker					GC trehad			Truncator
> - f2fs_write_cache_pages
>  - f2fs_write_single_data_page
>   - f2fs_do_write_data_page
>    - folio_start_writeback  --- set writeback flag on folio
>    - f2fs_outplace_write_data
>    : cached folio in internal bio cache
>   - f2fs_balance_fs
>    - wake_up(gc_thread)
>    : wake up gc thread to run foreground GC
>    - finish_wait(fggc_wq)
>    : wait on the waitqueue --- wait on GC thread to finish the work
> 									- truncate_inode_pages_range
> 									 - __filemap_get_folio(, FGP_LOCK)  --- lock folio
> 									 - truncate_inode_partial_folio
> 									  - folio_wait_writeback            --- wait on writeback being cleared
> 					- do_garbage_collect
> 					 - move_data_page
> 					  - f2fs_get_lock_data_folio
> 					   - lock on folio  --- blocked on folio's lock
> 
> [...]

Here is the summary with links:
  - [f2fs-dev] f2fs: fix potential deadlock in gc_merge path of f2fs_balance_fs()
    https://git.kernel.org/jaegeuk/f2fs/c/cf69827e772c

You are awesome, thank you!
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