From 5339f99606f19ce1eeadebf3c0849933dc0c6fd5 Mon Sep 17 00:00:00 2001
From: Guoqing Jiang <gqjiang@suse.com>
Date: Mon, 30 Oct 2017 17:09:51 +0800
Subject: [PATCH] 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>
---
 Grow.c  |  6 ++++++
 mdadm.c |  9 +++++++--
 mdadm.h |  1 +
 util.c  | 11 +++++++++++
 4 files changed, 25 insertions(+), 2 deletions(-)

diff --git a/Grow.c b/Grow.c
index 0f9e89b..80176e3 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 7cdcdba..87cb33f 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 85947bf..3cbf82f 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 c11729e..543ec6c 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;