xfs: repair realtime group superblock

Repair the realtime superblock if it has become out of date with the
primary superblock.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>

Author: Darrick J. Wong

fs/xfs/scrub/repair.h

@@ -146,9 +146,11 @@ int xrep_metapath(struct xfs_scrub *sc);
 #ifdef CONFIG_XFS_RT
 int xrep_rtbitmap(struct xfs_scrub *sc);
 int xrep_rtsummary(struct xfs_scrub *sc);
+int xrep_rgsuperblock(struct xfs_scrub *sc);
 #else
 # define xrep_rtbitmap			xrep_notsupported
 # define xrep_rtsummary			xrep_notsupported
+# define xrep_rgsuperblock		xrep_notsupported
 #endif /* CONFIG_XFS_RT */
 
 #ifdef CONFIG_XFS_QUOTA
@@ -253,6 +255,7 @@ static inline int xrep_setup_symlink(struct xfs_scrub *sc, unsigned int *x)
 #define xrep_symlink			xrep_notsupported
 #define xrep_dirtree			xrep_notsupported
 #define xrep_metapath			xrep_notsupported
+#define xrep_rgsuperblock		xrep_notsupported
 
 #endif /* CONFIG_XFS_ONLINE_REPAIR */
 

fs/xfs/scrub/rgsuper.c

@@ -10,8 +10,12 @@
 #include "xfs_trans_resv.h"
 #include "xfs_mount.h"
 #include "xfs_rtgroup.h"
+#include "xfs_log_format.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
 #include "scrub/scrub.h"
 #include "scrub/common.h"
+#include "scrub/repair.h"
 
 /* Set us up with a transaction and an empty context. */
 int
@@ -66,3 +70,15 @@ xchk_rgsuperblock(
 	xchk_rgsuperblock_xref(sc);
 	return 0;
 }
+
+#ifdef CONFIG_XFS_ONLINE_REPAIR
+int
+xrep_rgsuperblock(
+	struct xfs_scrub	*sc)
+{
+	ASSERT(rtg_rgno(sc->sr.rtg) == 0);
+
+	xfs_log_sb(sc->tp);
+	return 0;
+}
+#endif /* CONFIG_XFS_ONLINE_REPAIR */

fs/xfs/scrub/scrub.c

@@ -456,7 +456,7 @@ static const struct xchk_meta_ops meta_scrub_ops[] = {
 		.setup	= xchk_setup_rgsuperblock,
 		.scrub	= xchk_rgsuperblock,
 		.has	= xfs_has_rtsb,
-		.repair = xrep_notsupported,
+		.repair = xrep_rgsuperblock,
 	},
 };