From: Darrick J. Wong <djwong@kernel.org>
Date: Thu, 15 Aug 2024 18:49:05 +0000 (-0700)
Subject: xfs: walk the rt reverse mapping tree when rebuilding rmap
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=ef7b80b54f7d49ae7d4320953fe824dc6cc31774;p=users%2Fhch%2Fxfs.git

xfs: walk the rt reverse mapping tree when rebuilding rmap

When we're rebuilding the data device rmap, if we encounter an "rmap"
format fork, we have to walk the (realtime) rmap btree inode to build
the appropriate mappings.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
---

diff --git a/fs/xfs/scrub/rmap_repair.c b/fs/xfs/scrub/rmap_repair.c
index 3ce0f2a442db..709b31137153 100644
--- a/fs/xfs/scrub/rmap_repair.c
+++ b/fs/xfs/scrub/rmap_repair.c
@@ -31,6 +31,8 @@
 #include "xfs_refcount.h"
 #include "xfs_refcount_btree.h"
 #include "xfs_ag.h"
+#include "xfs_rtrmap_btree.h"
+#include "xfs_rtgroup.h"
 #include "scrub/xfs_scrub.h"
 #include "scrub/scrub.h"
 #include "scrub/common.h"
@@ -499,6 +501,37 @@ xrep_rmap_scan_iext(
 	return xrep_rmap_stash_accumulated(rf);
 }
 
+static int
+xrep_rmap_scan_rtrmapbt(
+	struct xrep_rmap_ifork	*rf,
+	struct xfs_inode	*ip)
+{
+	struct xfs_scrub	*sc = rf->rr->sc;
+	struct xfs_rtgroup	*rtg = NULL;
+	struct xfs_btree_cur	*cur;
+	int			error;
+
+	if (rf->whichfork != XFS_DATA_FORK)
+		return -EFSCORRUPTED;
+
+	while ((rtg = xfs_rtgroup_next(sc->mp, rtg))) {
+		if (ip == rtg->rtg_inodes[XFS_RTGI_RMAP]) {
+			cur = xfs_rtrmapbt_init_cursor(sc->mp, sc->tp, rtg, ip);
+			error = xrep_rmap_scan_iroot_btree(rf, cur);
+			xfs_btree_del_cursor(cur, error);
+			xfs_rtgroup_rele(rtg);
+			return error;
+		}
+	}
+
+	/*
+	 * We shouldn't find an rmap format inode that isn't associated with
+	 * an rtgroup!
+	 */
+	ASSERT(0);
+	return -EFSCORRUPTED;
+}
+
 /* Find all the extents from a given AG in an inode fork. */
 STATIC int
 xrep_rmap_scan_ifork(
@@ -528,6 +561,8 @@ xrep_rmap_scan_ifork(
 		error = xrep_rmap_scan_bmbt(&rf, ip, &mappings_done);
 		if (error || mappings_done)
 			return error;
+	} else if (ifp->if_format == XFS_DINODE_FMT_RMAP) {
+		return xrep_rmap_scan_rtrmapbt(&rf, ip);
 	} else if (ifp->if_format != XFS_DINODE_FMT_EXTENTS) {
 		return 0;
 	}