[29/37] xfs: repair rmap btree inodes

Commit Message

Darrick J. Wong Dec. 19, 2024, 7:30 p.m. UTC

From: Darrick J. Wong <[e-mail]>

Teach the inode repair code how to deal with realtime rmap btree inodes
that won't load properly.  This is most likely moot since the filesystem
generally won't mount without the rtrmapbt inodes being usable, but
we'll add this for completeness.

Signed-off-by: "Darrick J. Wong" <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
---
 fs/xfs/scrub/inode_repair.c |   35 +++++++++++++++++++++++++++++++++++
 1 file changed, 35 insertions(+)

Patch

diff --git a/fs/xfs/scrub/inode_repair.c b/fs/xfs/scrub/inode_repair.c
index 816e81330ffc99..d7e3f033b16073 100644
--- a/fs/xfs/scrub/inode_repair.c
+++ b/fs/xfs/scrub/inode_repair.c
@@ -944,6 +944,34 @@  xrep_dinode_bad_bmbt_fork(
 	return false;
 }
 
+/* Return true if this rmap-format ifork looks like garbage. */
+STATIC bool
+xrep_dinode_bad_rtrmapbt_fork(
+	struct xfs_scrub	*sc,
+	struct xfs_dinode	*dip,
+	unsigned int		dfork_size)
+{
+	struct xfs_rtrmap_root	*dfp;
+	unsigned int		nrecs;
+	unsigned int		level;
+
+	if (dfork_size < sizeof(struct xfs_rtrmap_root))
+		return true;
+
+	dfp = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
+	nrecs = be16_to_cpu(dfp->bb_numrecs);
+	level = be16_to_cpu(dfp->bb_level);
+
+	if (level > sc->mp->m_rtrmap_maxlevels)
+		return true;
+	if (xfs_rtrmap_droot_space_calc(level, nrecs) > dfork_size)
+		return true;
+	if (level > 0 && nrecs == 0)
+		return true;
+
+	return false;
+}
+
 /* Check a metadata-btree fork. */
 STATIC bool
 xrep_dinode_bad_metabt_fork(
@@ -956,6 +984,8 @@  xrep_dinode_bad_metabt_fork(
 		return true;
 
 	switch (be16_to_cpu(dip->di_metatype)) {
+	case XFS_METAFILE_RTRMAP:
+		return xrep_dinode_bad_rtrmapbt_fork(sc, dip, dfork_size);
 	default:
 		return true;
 	}
@@ -1220,6 +1250,7 @@  xrep_dinode_ensure_forkoff(
 	uint16_t		mode)
 {
 	struct xfs_bmdr_block	*bmdr;
+	struct xfs_rtrmap_root	*rmdr;
 	struct xfs_scrub	*sc = ri->sc;
 	xfs_extnum_t		attr_extents, data_extents;
 	size_t			bmdr_minsz = xfs_bmdr_space_calc(1);
@@ -1328,6 +1359,10 @@  xrep_dinode_ensure_forkoff(
 		break;
 	case XFS_DINODE_FMT_META_BTREE:
 		switch (be16_to_cpu(dip->di_metatype)) {
+		case XFS_METAFILE_RTRMAP:
+			rmdr = XFS_DFORK_PTR(dip, XFS_DATA_FORK);
+			dfork_min = xfs_rtrmap_broot_space(sc->mp, rmdr);
+			break;
 		default:
 			dfork_min = 0;
 			break;