linux-ext4 - Re: [PATCH] jbd2: correct the end of the journal recovery scan range

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Date:   Fri, 18 Aug 2023 01:05:12 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     linux-ext4@...r.kernel.org, Zhang Yi <yi.zhang@...weicloud.com>
Cc:     "Theodore Ts'o" <tytso@....edu>, adilger.kernel@...ger.ca,
        jack@...e.cz, harshadshirwadkar@...il.com, yi.zhang@...wei.com,
        yukuai3@...wei.com, chengzhihao1@...wei.com
Subject: Re: [PATCH] jbd2: correct the end of the journal recovery scan range


On Mon, 26 Jun 2023 15:33:22 +0800, Zhang Yi wrote:
> We got a filesystem inconsistency issue below while running generic/475
> I/O failure pressure test with fast_commit feature enabled.
> 
>  Symlink /p3/d3/d1c/d6c/dd6/dce/l101 (inode #132605) is invalid.
> 
> If fast_commit feature is enabled, a special fast_commit journal area is
> appended to the end of the normal journal area. The journal->j_last
> point to the first unused block behind the normal journal area instead
> of the whole log area, and the journal->j_fc_last point to the first
> unused block behind the fast_commit journal area. While doing journal
> recovery, do_one_pass(PASS_SCAN) should first scan the normal journal
> area and turn around to the first block once it meet journal->j_last,
> but the wrap() macro misuse the journal->j_fc_last, so the recovering
> could not read the next magic block (commit block perhaps) and would end
> early mistakenly and missing tN and every transaction after it in the
> following example. Finally, it could lead to filesystem inconsistency.
> 
> [...]

Applied, thanks!

[1/1] jbd2: correct the end of the journal recovery scan range
      commit: 3aab2c3d9ef0b30dd41e20c336377c43b4ca513e

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