xfs: Initialize all quota inodes to be NULLFSINO

mkfs doesn't initialize the quota inodes to NULLFSINO as it does for the
other internal inodes. This leads to two in-core values (0 and NULLFSINO)
to be checked against, to make sure if a quota inode is valid.

Solve that problem by initializing the in-core values of all quotaino
values to NULLFSINO if they are 0 in the disk.

Note that these values are not written back to on-disk superblock unless
some quota is enabled on the filesystem. Even in that case sb_pquotino is
written to disk only if the on-disk superblock supports pquotino

Signed-off-by: Chandra Seetharaman <sekharan@us.ibm.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 2b0ba358165619b87523315f1ca3940b4e2606c0..7263e1bb59f707ee4feb6fae9dbf68ee429a60d2 100644 (file)
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -572,6 +572,24 @@ out_unwind:
 static void
 xfs_sb_quota_from_disk(struct xfs_sb *sbp)
 {
+       /*
+        * older mkfs doesn't initialize quota inodes to NULLFSINO. This
+        * leads to in-core values having two different values for a quota
+        * inode to be invalid: 0 and NULLFSINO. Change it to a single value
+        * NULLFSINO.
+        *
+        * Note that this change affect only the in-core values. These
+        * values are not written back to disk unless any quota information
+        * is written to the disk. Even in that case, sb_pquotino field is
+        * not written to disk unless the superblock supports pquotino.
+        */
+       if (sbp->sb_uquotino == 0)
+               sbp->sb_uquotino = NULLFSINO;
+       if (sbp->sb_gquotino == 0)
+               sbp->sb_gquotino = NULLFSINO;
+       if (sbp->sb_pquotino == 0)
+               sbp->sb_pquotino = NULLFSINO;
+
        if (sbp->sb_qflags & XFS_OQUOTA_ENFD)
                sbp->sb_qflags |= (sbp->sb_qflags & XFS_PQUOTA_ACCT) ?
                                        XFS_PQUOTA_ENFD : XFS_GQUOTA_ENFD;