linux-kernel - XFS / Quota Bug in 2.6.17.x and 2.6.18x

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Message-ID: <44C8A5F1.7060604@profihost.com>
Date:	Thu, 27 Jul 2006 13:39:29 +0200
From:	ProfiHost - Stefan Priebe <s.priebe@...fihost.com>
To:	linux-kernel@...r.kernel.org
Subject: XFS / Quota Bug in  2.6.17.x and 2.6.18x

Hello!

The crash only occurs if you use quota and IDE without barrier support.

The Problem is, that on a new mount of a root filesystem - the flag 
VFS_RDONLY is set - and so no barrier check is done before checking 
quota. With this patch barrier check is done always. The partition 
should not be mounted at that moment. For mount -o remount, rw or 
something like this it uses another function where VFS_RDONLY is checked.

Error Message:
ns2 Wed Jul 26 14:22:58 2006 "I/O error in filesystem ("hda6") meta-data 
dev
hda6 block 0x23db5ab       ("xlog_iodone") error 5 buf count 1024"
ns2 Wed Jul 26 14:22:58 2006 "xfs_force_shutdown(hda6,0x2) called from line
959 of file fs/xfs/xfs_log.c.  Return address = 0xc0211535"
ns2 Wed Jul 26 14:22:58 2006 "Filesystem "hda6": Log I/O Error Detected.
Shutting down filesystem: hda6"
ns2 Wed Jul 26 14:22:58 2006 "Please umount the filesystem, and rectify the
problem(s)"
ns2 Wed Jul 26 14:22:58 2006 "xfs_force_shutdown(hda6,0x1) called from line
338 of file fs/xfs/xfs_rw.c.  Return address = 0xc0211535"
ns2 Wed Jul 26 14:22:58 2006 "xfs_force_shutdown(hda6,0x1) called from line
338 of file fs/xfs/xfs_rw.c.  Return address = 0xc0211535"

Patch:
*** fs/xfs/xfs_vfsops.c.orig	Thu Jul 27 13:10:23 2006
--- fs/xfs/xfs_vfsops.c	Thu Jul 27 13:11:17 2006
*************** xfs_mount(
*** 524,528 ****
   		goto error2;

! 	if ((mp->m_flags & XFS_MOUNT_BARRIER) && !(vfsp->vfs_flag &
VFS_RDONLY))
   		xfs_mountfs_check_barriers(mp);

--- 524,528 ----
   		goto error2;

! 	if (mp->m_flags & XFS_MOUNT_BARRIER)
   		xfs_mountfs_check_barriers(mp);

Best regards,
Ihr ProfiHost Team
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