[PATCH 6/7] xfs_repair: try not to trash qflags on metadir filesystems

["Darrick J. Wong" <djwong@xxxxxxxxxx>]

From: Darrick J. Wong <djwong@xxxxxxxxxx>

Try to preserve the accounting and enforcement quota flags when
repairing filesystems.

Signed-off-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
 repair/agheader.c |    3 ++-
 repair/phase4.c   |   20 ++++++++++++++++++++
 repair/sb.c       |    3 +++
 3 files changed, 25 insertions(+), 1 deletion(-)


diff --git a/repair/agheader.c b/repair/agheader.c
index e6fca07c6cb4c9..89a23a869a02e4 100644
--- a/repair/agheader.c
+++ b/repair/agheader.c
@@ -642,7 +642,8 @@ verify_set_agheader(xfs_mount_t *mp, struct xfs_buf *sbuf, xfs_sb_t *sb,
 			sb->sb_fdblocks = 0;
 			sb->sb_frextents = 0;
 
-			sb->sb_qflags = 0;
+			if (!xfs_has_metadir(mp))
+				sb->sb_qflags = 0;
 		}
 
 		rval |= XR_AG_SB;
diff --git a/repair/phase4.c b/repair/phase4.c
index a4183c557a1891..728d9ed84cdc7a 100644
--- a/repair/phase4.c
+++ b/repair/phase4.c
@@ -71,6 +71,26 @@ quotino_check(
 static void
 quota_sb_check(xfs_mount_t *mp)
 {
+	if (xfs_has_metadir(mp)) {
+		/*
+		 * Metadir filesystems try to preserve the quota accounting
+		 * and enforcement flags so that users don't have to remember
+		 * to supply quota mount options.  Phase 1 discovered the
+		 * QUOTABIT flag (fs_quotas) and phase 2 discovered the quota
+		 * inodes from the metadir for us.
+		 *
+		 * If QUOTABIT wasn't set but we found quota inodes, signal
+		 * phase 5 to add the feature bit for us.  We do not ever
+		 * downgrade the filesystem.
+		 */
+		if (!fs_quotas &&
+		    (has_quota_inode(XFS_DQTYPE_USER) ||
+		     has_quota_inode(XFS_DQTYPE_GROUP) ||
+		     has_quota_inode(XFS_DQTYPE_PROJ)))
+			fs_quotas = 1;
+		return;
+	}
+
 	/*
 	 * if the sb says we have quotas and we lost both,
 	 * signal a superblock downgrade.  that will cause
diff --git a/repair/sb.c b/repair/sb.c
index d52ab2ffeaf28c..0e4827e046780b 100644
--- a/repair/sb.c
+++ b/repair/sb.c
@@ -233,6 +233,9 @@ find_secondary_sb(xfs_sb_t *rsb)
         if (!retval)
                 retval = __find_secondary_sb(rsb, XFS_AG_MIN_BYTES, BSIZE);
 
+	if (retval && xfs_sb_version_hasmetadir(rsb))
+		do_warn(_("quota accounting and enforcement flags lost\n"));
+
 	return retval;
 }