XFS bug in log recover with quota (bugzilla id 855)

Hi,
I was hit by a bug in linux 2.6.31 when XFS is not able to recover the
log after a crash if fs was mounted with quotas. Gory details in XFS
bugzilla: http://oss.sgi.com/bugzilla/show_bug.cgi?id=855.

It looks like wrong struct is used in buffer length check, and the following
patch should fix the problem.

xfs_dqblk_t has a size of 104+32 bytes, while xfs_disk_dquot_t is 104 bytes
long, and this is exactly what I see in system logs - "XFS: dquot too small
(104) in xlog_recover_do_dquot_trans."

Signed-off-by: Jan Rekorajski <baggins@sith.mimuw.edu.pl>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 1099395d7d6c..fb17f8226b09 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -1980,7 +1980,7 @@ xlog_recover_do_reg_buffer(
                                         "XFS: NULL dquot in %s.", __func__);
                                 goto next;
                         }
-                        if (item->ri_buf[i].i_len < sizeof(xfs_dqblk_t)) {
+                        if (item->ri_buf[i].i_len < sizeof(xfs_disk_dquot_t)) {
                                 cmn_err(CE_ALERT,
                                         "XFS: dquot too small (%d) in %s.",
                                         item->ri_buf[i].i_len, __func__);
@@ -2635,7 +2635,7 @@ xlog_recover_do_dquot_trans(
                         "XFS: NULL dquot in %s.", __func__);
                 return XFS_ERROR(EIO);
         }
-        if (item->ri_buf[1].i_len < sizeof(xfs_dqblk_t)) {
+        if (item->ri_buf[1].i_len < sizeof(xfs_disk_dquot_t)) {
                 cmn_err(CE_ALERT,
                         "XFS: dquot too small (%d) in %s.",
                         item->ri_buf[1].i_len, __func__);