linux-ext4 - Re: [PATCH] e2fsck: Always probe filesystem blocksize with simple io

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Message-Id: <166022767028.3024810.4081400263352590556.b4-ty@mit.edu>
Date:   Thu, 11 Aug 2022 10:32:35 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     krisman@...labora.com
Cc:     "Theodore Ts'o" <tytso@....edu>, linux-ext4@...r.kernel.org,
        linux-ext4.vger.kernel.org@...anec.net
Subject: Re: [PATCH] e2fsck: Always probe filesystem blocksize with simple io_manager

On Mon, 25 Apr 2022 18:01:00 -0400, Gabriel Krisman Bertazi wrote:
>Combining superblock (-b) with undo file (-z) fails iff the block size
>is not specified (-B) and is different from the first blocksize probed
>in try_open_fs (1k).  The reason is as follows:
>
>try_open_fs() will probe different blocksizes if none is provided on
>the command line. It is done by opening and closing the filesystem
>until it finds a blocksize that makes sense. This is fine for all
>io_managers, but undo_io creates the undo file with that blocksize
>during ext2fs_open.  Once try_open_fs realizes it had the wrong
>blocksize and retries with a different blocksize, undo_io will read
>the previously created file and think it's corrupt for this
>filesystem.

Applied, thanks!

[1/1] e2fsck: Always probe filesystem blocksize with simple io_manager
      commit: 0ae0e93624a933a1c6ea4e4680ff5d609f267a43

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