To support clustered raid10

We are now considering to extend clustered raid to
support raid10. But only near layout is supported,
so make the check when create the array or switch
the bitmap from internal to clustered.

Signed-off-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Jes Sorensen <jsorensen@fb.com>

4 files changed, 25 insertions, 2 deletions

diff --git a/Grow.c b/Grow.c
index 0f9e89bc..80176e32 100644
--- a/Grow.c
+++ b/Grow.c
@@ -359,6 +359,12 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
 
 		ncopies = (array.layout & 255) * ((array.layout >> 8) & 255);
 		bitmapsize = bitmapsize * array.raid_disks / ncopies;
+
+		if (strcmp(s->bitmap_file, "clustered") == 0 &&
+		    !is_near_layout_10(array.layout)) {
+			pr_err("only near layout is supported with clustered raid10\n");
+			return 1;
+		}
 	}
 
 	st = super_by_fd(fd, &subarray);
diff --git a/mdadm.c b/mdadm.c
index 7cdcdba7..87cb33f8 100644
--- a/mdadm.c
+++ b/mdadm.c
@@ -1542,8 +1542,13 @@ int main(int argc, char *argv[])
 				break;
 			}
 
-			if (s.level != 1) {
-				pr_err("--bitmap=clustered is currently supported with RAID mirror only\n");
+			if (s.level != 1 && s.level != 10) {
+				pr_err("--bitmap=clustered is currently supported with raid1/10 only\n");
+				rv = 1;
+				break;
+			}
+			if (s.level == 10 && !is_near_layout_10(s.layout)) {
+				pr_err("only near layout is supported with clustered raid10\n");
 				rv = 1;
 				break;
 			}
diff --git a/mdadm.h b/mdadm.h
index 85947bf6..3cbf82f1 100644
--- a/mdadm.h
+++ b/mdadm.h
@@ -1434,6 +1434,7 @@ extern int get_linux_version(void);
 extern int mdadm_version(char *version);
 extern unsigned long long parse_size(char *size);
 extern int parse_uuid(char *str, int uuid[4]);
+extern int is_near_layout_10(int layout);
 extern int parse_layout_10(char *layout);
 extern int parse_layout_faulty(char *layout);
 extern long parse_num(char *num);
diff --git a/util.c b/util.c
index c11729e3..543ec6cf 100644
--- a/util.c
+++ b/util.c
@@ -397,6 +397,17 @@ unsigned long long parse_size(char *size)
 	return s;
 }
 
+int is_near_layout_10(int layout)
+{
+	int fc, fo;
+
+	fc = (layout >> 8) & 255;
+	fo = layout & (1 << 16);
+	if (fc > 1 || fo > 0)
+		return 0;
+	return 1;
+}
+
 int parse_layout_10(char *layout)
 {
 	int copies, rv;