linux-kernel - Re: [PATCH v3] jbd2: Fix potential data lost in recovering journal raced with synchronizing fs bdev

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Message-Id: <169661554697.173366.17984924984447813917.b4-ty@mit.edu>
Date:   Fri,  6 Oct 2023 14:06:17 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     jack@...e.com, Zhihao Cheng <chengzhihao1@...wei.com>
Cc:     "Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org,
        linux-kernel@...r.kernel.org, yi.zhang@...wei.com
Subject: Re: [PATCH v3] jbd2: Fix potential data lost in recovering journal raced with synchronizing fs bdev


On Tue, 19 Sep 2023 09:25:25 +0800, Zhihao Cheng wrote:
> JBD2 makes sure journal data is fallen on fs device by sync_blockdev(),
> however, other process could intercept the EIO information from bdev's
> mapping, which leads journal recovering successful even EIO occurs during
> data written back to fs device.
> 
> We found this problem in our product, iscsi + multipath is chosen for block
> device of ext4. Unstable network may trigger kpartx to rescan partitions in
> device mapper layer. Detailed process is shown as following:
> 
> [...]

Applied, thanks!

[1/1] jbd2: Fix potential data lost in recovering journal raced with synchronizing fs bdev
      commit: 61187fce8600e8ef90e601be84f9d0f3222c1206

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