[PATCH] xfs: Initialize all quota inodes to be NULLFSINO

[Chandra Seetharaman <sekharan@xxxxxxxxxx>]

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

Solve that problem by initializing the values to NULLFSINO
if they are 0.

Note that these values are not written back to on-disk
superblock unless some quota is enabled on the filesystem.

Signed-off-by: Chandra Seetharaman <sekharan@xxxxxxxxxx>
---
 fs/xfs/xfs_mount.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 2b0ba35..8b95933 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -572,6 +572,18 @@ out_unwind:
 static void
 xfs_sb_quota_from_disk(struct xfs_sb *sbp)
 {
+       /*
+        * older mkfs doesn't initialize quota inodes to NULLFSINO,
+        * which leads to two values for a quota inode to be invalid:
+        * 0 and NULLFSINO. Fix it.
+        */
+       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;
-- 
1.7.1