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Re: [PATCH 06/12] xfs: remote attribute read too short

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: [PATCH 06/12] xfs: remote attribute read too short
From: Ben Myers <bpm@xxxxxxx>
Date: Mon, 5 Aug 2013 16:57:19 -0500
Cc: xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <1370607901-11538-7-git-send-email-david@xxxxxxxxxxxxx>
References: <1370564771-4929-1-git-send-email-david@xxxxxxxxxxxxx> <1370607901-11538-1-git-send-email-david@xxxxxxxxxxxxx> <1370607901-11538-7-git-send-email-david@xxxxxxxxxxxxx>
User-agent: Mutt/1.5.20 (2009-06-14)
On Fri, Jun 07, 2013 at 10:24:55PM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@xxxxxxxxxx>
> Reading a maximally size remote attribute fails when CRCs are
> enabled with this verification error:
> XFS (vdb): remote attribute header does not match required off/len/owner)
> There are two reasons for this, the first being that the
> length of the buffer being read is determined from the
> args->rmtblkcnt which doesn't take into account CRC headers. Hence
> the mapped length ends up being too short and so we need to
> calculate it directly from the value length.
> The second is that the byte count of valid data within a buffer is
> capped by the length of the data and so doesn't take into account
> that the buffer might be longer due to headers. Hence we need to
> calculate the data space in the buffer first before calculating the
> actual byte count of data.
> Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>

Goes with commit 551b382f5368900d6d82983505cb52553c946a2b

Reviewed-by: Ben Myers <bpm@xxxxxxx>

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