From: Ben Myers <bpm@sgi.com>
To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com
Subject: Re: [PATCH 10/14] xfs: remote attribute read too short
Date: Mon, 20 May 2013 18:00:46 -0500 [thread overview]
Message-ID: <20130520230046.GH20028@sgi.com> (raw)
In-Reply-To: <1369007481-15185-11-git-send-email-david@fromorbit.com>
On Mon, May 20, 2013 at 09:51:17AM +1000, Dave Chinner wrote:
> From: Dave Chinner <dchinner@redhat.com>
>
> 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@redhat.com>
> ---
> fs/xfs/xfs_attr_remote.c | 15 +++++++++------
> 1 file changed, 9 insertions(+), 6 deletions(-)
>
> diff --git a/fs/xfs/xfs_attr_remote.c b/fs/xfs/xfs_attr_remote.c
> index aad95b0..bcdc07c 100644
> --- a/fs/xfs/xfs_attr_remote.c
> +++ b/fs/xfs/xfs_attr_remote.c
> @@ -52,9 +52,11 @@ xfs_attr3_rmt_blocks(
> struct xfs_mount *mp,
> int attrlen)
> {
> - int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp,
> - mp->m_sb.sb_blocksize);
> - return (attrlen + buflen - 1) / buflen;
> + if (xfs_sb_version_hascrc(&mp->m_sb)) {
> + int buflen = XFS_ATTR3_RMT_BUF_SPACE(mp, mp->m_sb.sb_blocksize);
> + return (attrlen + buflen - 1) / buflen;
> + }
> + return XFS_B_TO_FSB(mp, attrlen);
> }
xfs_attr_rmtval_set, previously the only caller of xfs_attr3_rmt_blocks already
checks for crcs. Can one of the two conditionals be dispensed with?
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next prev parent reply other threads:[~2013-05-20 23:00 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-05-19 23:51 [PATCH 00/14] xfs: fixes for 3.10-rc2 (update) Dave Chinner
2013-05-19 23:51 ` [PATCH 01/14] xfs: fix sub-page blocksize data integrity writes Dave Chinner
2013-05-20 18:02 ` Brian Foster
2013-05-20 19:18 ` Ben Myers
2013-05-19 23:51 ` [PATCH 02/14] xfs: fix rounding in xfs_free_file_space Dave Chinner
2013-05-20 18:03 ` Brian Foster
2013-05-19 23:51 ` [PATCH 03/14] xfs: Don't reference the EFI after it is freed Dave Chinner
2013-05-20 18:03 ` Brian Foster
2013-05-19 23:51 ` [PATCH 04/14] xfs: avoid nesting transactions in xfs_qm_scall_setqlim() Dave Chinner
2013-05-20 18:03 ` Brian Foster
2013-05-21 0:06 ` Dave Chinner
2013-05-21 0:36 ` [PATCH 04/14 V2] " Dave Chinner
2013-05-21 10:51 ` Brian Foster
2013-05-19 23:51 ` [PATCH 05/14] xfs: fix missing KM_NOFS tags to keep lockdep happy Dave Chinner
2013-05-20 21:16 ` Ben Myers
2013-05-21 0:08 ` Dave Chinner
2013-05-19 23:51 ` [PATCH 06/14] xfs: xfs_da3_node_read_verify() doesn't handle XFS_ATTR3_LEAF_MAGIC Dave Chinner
2013-05-20 21:32 ` Ben Myers
2013-05-19 23:51 ` [PATCH 07/14] xfs: xfs_attr_shortform_allfit() does not handle attr3 format Dave Chinner
2013-05-20 21:52 ` Ben Myers
2013-05-19 23:51 ` [PATCH 08/14] xfs: remote attribute allocation may be contiguous Dave Chinner
2013-05-20 19:03 ` Brian Foster
2013-05-20 22:04 ` Ben Myers
2013-05-21 0:25 ` Dave Chinner
2013-05-19 23:51 ` [PATCH 09/14] xfs: remote attribute lookups require the value length Dave Chinner
2013-05-20 22:15 ` Ben Myers
2013-05-19 23:51 ` [PATCH 10/14] xfs: remote attribute read too short Dave Chinner
2013-05-20 23:00 ` Ben Myers [this message]
2013-05-19 23:51 ` [PATCH 11/14] xfs: remote attribute tail zeroing does too much Dave Chinner
2013-05-20 23:01 ` Ben Myers
2013-05-19 23:51 ` [PATCH 12/14] xfs: correctly map remote attr buffers during removal Dave Chinner
2013-05-19 23:51 ` [PATCH 13/14] xfs: fully initialise temp leaf in xfs_attr3_leaf_unbalance Dave Chinner
2013-05-19 23:51 ` [PATCH 14/14] xfs: fully initialise temp leaf in xfs_attr3_leaf_compact Dave Chinner
2013-05-20 19:37 ` [PATCH 00/14] xfs: fixes for 3.10-rc2 (update) Ben Myers
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