linux-ext4 - Re: [PATCH] ext4: Fix mmap write protection for data=journal mode

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Message-ID: <20201028035643.GP5691@mit.edu>
Date:   Tue, 27 Oct 2020 23:56:43 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org,
        Mauricio Faria de Oliveira <mfo@...onical.com>
Subject: Re: [PATCH] ext4: Fix mmap write protection for data=journal mode

On Tue, Oct 27, 2020 at 02:27:51PM +0100, Jan Kara wrote:
> Commit afb585a97f81 "ext4: data=journal: write-protect pages on
> j_submit_inode_data_buffers()") added calls ext4_jbd2_inode_add_write()
> to track inode ranges whose mappings need to get write-protected during
> transaction commits. However the added calls use wrong start of a range
> (0 instead of page offset) and so write protection is not necessarily
> effective. Use correct range start to fix the problem.
> 
> Fixes: afb585a97f81 ("ext4: data=journal: write-protect pages on j_submit_inode_data_buffers()")
> Signed-off-by: Jan Kara <jack@...e.cz>

Thanks, applied.

					- Ted