xfs: repair the AGF

Regenerate the AGF from the rmap data.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>

fs/xfs/scrub/repair.c

@@ -128,8 +128,11 @@ xrep_roll_ag_trans(
 	int			error;
 
 	/* Keep the AG header buffers locked so we can keep going. */
+	if (sc->sa.agi_bp)
 		xfs_trans_bhold(sc->tp, sc->sa.agi_bp);
+	if (sc->sa.agf_bp)
 		xfs_trans_bhold(sc->tp, sc->sa.agf_bp);
+	if (sc->sa.agfl_bp)
 		xfs_trans_bhold(sc->tp, sc->sa.agfl_bp);
 
 	/* Roll the transaction. */
@@ -138,8 +141,11 @@ xrep_roll_ag_trans(
 		goto out_release;
 
 	/* Join AG headers to the new transaction. */
+	if (sc->sa.agi_bp)
 		xfs_trans_bjoin(sc->tp, sc->sa.agi_bp);
+	if (sc->sa.agf_bp)
 		xfs_trans_bjoin(sc->tp, sc->sa.agf_bp);
+	if (sc->sa.agfl_bp)
 		xfs_trans_bjoin(sc->tp, sc->sa.agfl_bp);
 
 	return 0;
@@ -150,8 +156,11 @@ xrep_roll_ag_trans(
 	 * buffers will be released during teardown on our way out
 	 * of the kernel.
 	 */
+	if (sc->sa.agi_bp)
 		xfs_trans_bhold_release(sc->tp, sc->sa.agi_bp);
+	if (sc->sa.agf_bp)
 		xfs_trans_bhold_release(sc->tp, sc->sa.agf_bp);
+	if (sc->sa.agfl_bp)
 		xfs_trans_bhold_release(sc->tp, sc->sa.agfl_bp);
 
 	return error;

fs/xfs/scrub/repair.h

@@ -58,6 +58,7 @@ int xrep_ino_dqattach(struct xfs_scrub *sc);
 
 int xrep_probe(struct xfs_scrub *sc);
 int xrep_superblock(struct xfs_scrub *sc);
+int xrep_agf(struct xfs_scrub *sc);
 
 #else
 
@@ -81,6 +82,7 @@ xrep_calc_ag_resblks(
 
 #define xrep_probe			xrep_notsupported
 #define xrep_superblock			xrep_notsupported
+#define xrep_agf			xrep_notsupported
 
 #endif /* CONFIG_XFS_ONLINE_REPAIR */
 

fs/xfs/scrub/scrub.c

@@ -214,7 +214,7 @@ static const struct xchk_meta_ops meta_scrub_ops[] = {
 		.type	= ST_PERAG,
 		.setup	= xchk_setup_fs,
 		.scrub	= xchk_agf,
-		.repair	= xrep_notsupported,
+		.repair	= xrep_agf,
 	},
 	[XFS_SCRUB_TYPE_AGFL]= {	/* agfl */
 		.type	= ST_PERAG,