[PATCH 1/2] xfs: validate that zoned RT devices are zone aligned

[Christoph Hellwig <hch@lst.de>]

Garbage collection assumes all zones contain the full amount of blocks.
Mkfs already ensures this happens, but make the kernel check it as well
to avoid getting into trouble due to fuzzers or mkfs bugs.

Fixes: 2167eaabe2fa ("xfs: define the zoned on-disk format")
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 fs/xfs/libxfs/xfs_sb.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c
index cdd16dd805d7..db5231f846ea 100644
--- a/fs/xfs/libxfs/xfs_sb.c
+++ b/fs/xfs/libxfs/xfs_sb.c
@@ -301,6 +301,19 @@ xfs_validate_rt_geometry(
 	    sbp->sb_rbmblocks != xfs_expected_rbmblocks(sbp))
 		return false;
 
+	if (xfs_sb_is_v5(sbp) &&
+	    (sbp->sb_features_incompat & XFS_SB_FEAT_INCOMPAT_ZONED)) {
+		uint32_t		mod;
+
+		/*
+		 * Zoned RT devices must be aligned to the rtgroup size, because
+		 * garbage collection can't deal with rump RT groups.
+		 */
+		div_u64_rem(sbp->sb_rextents, sbp->sb_rgextents, &mod);
+		if (mod)
+			return false;
+	}
+
 	return true;
 }
 
-- 
2.47.3