When mounting an xfs disk that incompat with metadir and has no realtime
subvolume, if CONFIG_XFS_RT is not enabled in the kernel, the mount will
fail. During superblock log recovery, since mp->m_sb.sb_rgcount is greater
than 0, updating the last rtag in-core is required, however, without
CONFIG_XFS_RT enabled, xfs_update_last_rtgroup_size() always returns
-EOPNOTSUPP, leading to mount failure.
Initializing sb_rgcount as 1 is incorrect in this scenario. If no
realtime subvolume exists, the value of sb_rgcount should be set
to zero. Fix it by initializing sb_rgcount based on the actual number
of realtime blocks.
Fixes: 87fe4c34a383 ("xfs: create incore realtime group structures")
Signed-off-by: Long Li <leo.lilong@xxxxxxxxxx>
---
fs/xfs/libxfs/xfs_sb.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index 3b5623611eba..1ea28f04b75a 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -830,7 +830,7 @@ __xfs_sb_from_disk(
to->sb_rsumino = NULLFSINO;
} else {
to->sb_metadirino = NULLFSINO;
- to->sb_rgcount = 1;
+ to->sb_rgcount = to->sb_rblocks > 0 ? 1 : 0;
to->sb_rgextents = 0;
}
}
--
2.39.2
