linux-ext4 - Re: [PATCH v3] ext4: Properly sync file size update after O

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Message-Id: <169802252287.2300216.15136208439429495793.b4-ty@mit.edu>
Date:   Sun, 22 Oct 2023 20:55:29 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     "Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org,
        "Ritesh Harjani (IBM)" <ritesh.list@...il.com>,
        Dave Chinner <david@...morbit.com>, stable@...r.kernel.org,
        Gao Xiang <xiang@...nel.org>
Subject: Re: [PATCH v3] ext4: Properly sync file size update after O_SYNC direct IO


On Fri, 13 Oct 2023 14:13:50 +0200, Jan Kara wrote:
> Gao Xiang has reported that on ext4 O_SYNC direct IO does not properly
> sync file size update and thus if we crash at unfortunate moment, the
> file can have smaller size although O_SYNC IO has reported successful
> completion. The problem happens because update of on-disk inode size is
> handled in ext4_dio_write_iter() *after* iomap_dio_rw() (and thus
> dio_complete() in particular) has returned and generic_file_sync() gets
> called by dio_complete(). Fix the problem by handling on-disk inode size
> update directly in our ->end_io completion handler.
> 
> [...]

Applied, thanks!

[1/1] ext4: Properly sync file size update after O_SYNC direct IO
      commit: c388da1dad59dc24801b61bc63539cab6cd83e23

Best regards,
-- 
Theodore Ts'o <tytso@....edu>