linux-kernel - Re: [PATCH -next v2] ext4:fix file system corrupted when rmdir non empty directory with IO error

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Date:   Fri, 25 Feb 2022 21:23:37 -0500
From:   "Theodore Ts'o" <tytso@....edu>
To:     Ye Bin <yebin10@...wei.com>
Cc:     adilger.kernel@...ger.ca, linux-ext4@...r.kernel.org,
        jaegeuk@...nel.org, chao@...nel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org, jack@...e.cz, lczerner@...hat.com
Subject: Re: [PATCH -next v2] ext4:fix file system corrupted when rmdir non
 empty directory with IO error

On Fri, Feb 11, 2022 at 05:35:27PM +0800, Ye Bin wrote:
> Now if read directory block failed, 'ext4_empty_dir' will return true, assume
> directory is empty. Obviously, it will lead to above issue.
> To solve this issue, if read directory block failed 'ext4_empty_dir' just assume
> directory isn't empty. To avoid making things worse when file system is already
> corrupted, 'ext4_empty_dir' also assume directory isn't empty.
> To distinguish the error type, return the exact error code to the caller.
>

Does the same issue exist for f2fs and ubifs?  We could solve the
specific bug much more simply by having ext4_empty_dir() return FALSE
if we aren't able to read the directory block.  Yes, it means that we
don't return as specific an error code in the case of an I/O error ---
although I believe we do syslog a warning --- but it makes for a much
simpler patch that doesn't requiring getting acked-by's from the
fscrypt, f2fs and ubifs folks.

							- Ted