linux-ext4 - Re: [PATCH] ext4: Detect already used quota file early

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Message-ID: <20201015145248.GD181507@mit.edu>
Date:   Thu, 15 Oct 2020 10:52:48 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org, Ritesh Harjani <riteshh@...ux.ibm.com>
Subject: Re: [PATCH] ext4: Detect already used quota file early

On Tue, Oct 13, 2020 at 03:22:21PM +0200, Jan Kara wrote:
> When we try to use file already used as a quota file again (for the same
> or different quota type), strange things can happen. At the very least
> lockdep annotations may be wrong but also inode flags may be wrongly set
> / reset. When the file is used for two quota types at once we can even
> corrupt the file and likely crash the kernel. Catch all these cases by
> checking whether passed file is already used as quota file and bail
> early in that case.
> 
> This fixes occasional generic/219 failure due to lockdep complaint.
> 
> Reported-by: Ritesh Harjani <riteshh@...ux.ibm.com>
> Signed-off-by: Jan Kara <jack@...e.cz>

Thanks, applied.

					- Ted