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Re: [PATCH 5/9] repair: detect CRC errors in AG headers

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 5/9] repair: detect CRC errors in AG headers
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 21 Apr 2014 00:11:06 -0700
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1397550301-31883-6-git-send-email-david@xxxxxxxxxxxxx>
References: <1397550301-31883-1-git-send-email-david@xxxxxxxxxxxxx> <1397550301-31883-6-git-send-email-david@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Tue, Apr 15, 2014 at 06:24:57PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> 
> repair doesn't currently detect verifier errors in AG header
> blocks - apart from the primary superblock they are not detected.
> They are, fortunately, corrected in the important cases (AGF, AGI
> and AGFL) because these structures are rebuilt in phase 5, but if
> you run xfs_repair in checking mode it won't report them as bad.

Shouldn't we apply the same scheme as for directories here, that is if
it fails with a verifier error re-read without the verifier and then
still do the full check as well?

Btw, it might make sense to have special read_buf variants in libxfs
that always return a valid buffer even if the verifier fails, just
telling us about it without having to re-read.

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