linux-kernel - Re: [f2fs-dev] [PATCH v3] f2fs: fix to avoid mmap vs set_compress

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Date:   Mon, 17 Jul 2023 17:34:21 +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 mmap vs
 set_compress_option case

Hello:

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

On Thu,  6 Jul 2023 10:06:14 +0800 you wrote:
> Compression option in inode should not be changed after they have
> been used, however, it may happen in below race case:
> 
> Thread A				Thread B
> - f2fs_ioc_set_compress_option
>  - check f2fs_is_mmap_file()
>  - check get_dirty_pages()
>  - check F2FS_HAS_BLOCKS()
> 					- f2fs_file_mmap
> 					 - set_inode_flag(FI_MMAP_FILE)
> 					- fault
> 					 - do_page_mkwrite
> 					  - f2fs_vm_page_mkwrite
> 					  - f2fs_get_block_locked
> 					 - fault_dirty_shared_page
> 					  - set_page_dirty
>  - update i_compress_algorithm
>  - update i_log_cluster_size
>  - update i_cluster_size
> 
> [...]

Here is the summary with links:
  - [f2fs-dev,v3] f2fs: fix to avoid mmap vs set_compress_option case
    https://git.kernel.org/jaegeuk/f2fs/c/3174a6dbb945

You are awesome, thank you!
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