linux-kernel - Re: [f2fs-dev] [PATCH v3] f2fs: fix to avoid racing in between read and OPU dio write

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Message-Id: 
 <172290065212.2803.17197676609534608059.git-patchwork-notify@kernel.org>
Date: Mon, 05 Aug 2024 23:30:52 +0000
From: patchwork-bot+f2fs@...nel.org
To: Chao Yu <chao@...nel.org>
Cc: jaegeuk@...nel.org, linux-kernel@...r.kernel.org,
 linux-f2fs-devel@...ts.sourceforge.net
Subject: Re: [f2fs-dev] [PATCH v3] f2fs: fix to avoid racing in between read and
 OPU dio write

Hello:

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

On Thu, 27 Jun 2024 15:15:21 +0800 you wrote:
> If lfs mode is on, buffered read may race w/ OPU dio write as below,
> it may cause buffered read hits unwritten data unexpectly, and for
> dio read, the race condition exists as well.
> 
> Thread A			Thread B
> - f2fs_file_write_iter
>  - f2fs_dio_write_iter
>   - __iomap_dio_rw
>    - f2fs_iomap_begin
>     - f2fs_map_blocks
>      - __allocate_data_block
>       - allocated blkaddr #x
>        - iomap_dio_submit_bio
> 				- f2fs_file_read_iter
> 				 - filemap_read
> 				  - f2fs_read_data_folio
> 				   - f2fs_mpage_readpages
> 				    - f2fs_map_blocks
> 				     : get blkaddr #x
> 				    - f2fs_submit_read_bio
> 				IRQ
> 				- f2fs_read_end_io
> 				 : read IO on blkaddr #x complete
> IRQ
> - iomap_dio_bio_end_io
>  : direct write IO on blkaddr #x complete
> 
> [...]

Here is the summary with links:
  - [f2fs-dev,v3] f2fs: fix to avoid racing in between read and OPU dio write
    https://git.kernel.org/jaegeuk/f2fs/c/415ea641b020

You are awesome, thank you!
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