linux-ext4 - Re: [PATCH 20/22] jbd2: Make credit checking more strict

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Message-ID: <20191021222959.GE24015@mit.edu>
Date:   Mon, 21 Oct 2019 18:29:59 -0400
From:   "Theodore Y. Ts'o" <tytso@....edu>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: [PATCH 20/22] jbd2: Make credit checking more strict

On Fri, Oct 04, 2019 at 12:06:06AM +0200, Jan Kara wrote:
> Make checking of available credits in jbd2_journal_dirty_metadata() more
> strict. There should be always enough credits in the handle to write all
> potential revoke descriptors. Also we warn in case there are not enough
> credits since this is a bug in the filesystem.
> 
> Signed-off-by: Jan Kara <jack@...e.cz>

This is fine, but I wonder if we should also be returning an error in
jbd2_journal_revoke() --- of course, one problem is ext4_forget() is
getting called from ext4_free_blocks(), which currently doesn't return
an error.  But we can capture the error return in __ext4_forget(), and
at that point we can give a much more useful error message, since we
can print the function caller and line number.

Feel free to add:

Reviewed-by: Theodore Ts'o <tytso@....edu>