Re: [PATCH] imsm: block chunk size change for RAID 10

Chunk size change of RAID 10 array fails because it is not supported but
invalid values still are being written to metadata and array cannot be
assembled after stop. Operation should be blocked before metadata update.

Signed-off-by: Mariusz Dabrowski <redacted>
---
 super-intel.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/super-intel.c b/super-intel.c
index 92817e9..0b3b2b1 100644
--- a/super-intel.c
+++ b/super-intel.c

@@ -10074,10 +10074,16 @@ enum imsm_reshape_type imsm_analyze_change(struct supertype *st,
 	}
 
 	if ((geo->chunksize > 0) && (geo->chunksize != UnSet)
-	    && (geo->chunksize != info.array.chunk_size))
+	    && (geo->chunksize != info.array.chunk_size)) {
+		if (info.array.level == 10) {
+			pr_err("Error. Chunk size change for RAID 10 is not supported.\n");
+			change = -1;
+			goto analyse_change_exit;
+		}
 		change = CH_MIGRATION;
-	else
+	} else {
 		geo->chunksize = info.array.chunk_size;
+	}
 
 	chunk = geo->chunksize / 1024;