diff --git a/0032-Grow-fix-can-t-change-bitmap-type-from-none-to-clust.patch b/0032-Grow-fix-can-t-change-bitmap-type-from-none-to-clust.patch
new file mode 100644
index 0000000000000000000000000000000000000000..5352d08da14307711d82a6e5003edeb513aad172
--- /dev/null
+++ b/0032-Grow-fix-can-t-change-bitmap-type-from-none-to-clust.patch
@@ -0,0 +1,44 @@
+From d07e561810a2e33b667a8a9476edaff42eb119b9 Mon Sep 17 00:00:00 2001
+From: Heming Zhao <heming.zhao@suse.com>
+Date: Thu, 23 Feb 2023 22:39:39 +0800
+Subject: [PATCH] Grow: fix can't change bitmap type from none to clustered.
+
+Commit a042210648ed ("disallow create or grow clustered bitmap with
+writemostly set") introduced this bug. We should use 'true' logic not
+'== 0' to deny setting up clustered array under WRITEMOSTLY condition.
+
+How to trigger
+
+```
+~/mdadm # ./mdadm -Ss && ./mdadm --zero-superblock /dev/sd{a,b}
+~/mdadm # ./mdadm -C /dev/md0 -l mirror -b clustered -e 1.2 -n 2 \
+/dev/sda /dev/sdb --assume-clean
+mdadm: array /dev/md0 started.
+~/mdadm # ./mdadm --grow /dev/md0 --bitmap=none
+~/mdadm # ./mdadm --grow /dev/md0 --bitmap=clustered
+mdadm: /dev/md0 disks marked write-mostly are not supported with clustered bitmap
+```
+
+Signed-off-by: Heming Zhao <heming.zhao@suse.com>
+Acked-by: Coly Li <colyli@suse.de>
+Signed-off-by: Jes Sorensen <jes@trained-monkey.org>
+---
+ Grow.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+diff --git a/Grow.c b/Grow.c
+index 9c6fc95..efcdce8 100644
+--- a/Grow.c
++++ b/Grow.c
+@@ -430,7 +430,7 @@ int Grow_addbitmap(char *devname, int fd, struct context *c, struct shape *s)
+ 			dv = map_dev(disk.major, disk.minor, 1);
+ 			if (!dv)
+ 				continue;
+-			if (((disk.state & (1 << MD_DISK_WRITEMOSTLY)) == 0) &&
++			if ((disk.state & (1 << MD_DISK_WRITEMOSTLY)) &&
+ 			   (strcmp(s->bitmap_file, "clustered") == 0)) {
+ 				pr_err("%s disks marked write-mostly are not supported with clustered bitmap\n",devname);
+ 				return 1;
+-- 
+2.43.0
+
diff --git a/mdadm.spec b/mdadm.spec
index 6ead07ab0d239cb9628ef0a6cb4ea883c8ca2f02..252053db5899c9fe0c2a250b67ea57d08fb432b2 100644
--- a/mdadm.spec
+++ b/mdadm.spec
@@ -1,6 +1,6 @@
 Name:     mdadm
 Version:  4.2
-Release:  19
+Release:  20
 Summary:  The software RAID arrays user manage tools
 License:  GPLv2+
 URL:      http://www.kernel.org/pub/linux/utils/raid/mdadm/
@@ -41,6 +41,7 @@ Patch28: 0028-mdadm-super1-fix-coverity-issue-CHECKED_RETURN.patch
 Patch39: 0029-mdadm-util.c-fix-coverity-issues.patch
 Patch30: 0030-mdadm-sysfs.c-fix-coverity-issues.patch
 Patch31: 0031-super1-Clear-extra-flags-when-initializing-metadata.patch
+Patch32: 0032-Grow-fix-can-t-change-bitmap-type-from-none-to-clust.patch
 
 BuildRequires:    systemd gcc binutils libudev-devel
 
@@ -107,6 +108,9 @@ install -d -m 710 %{buildroot}/var/run/mdadm/
 %{_mandir}/man*/*
 
 %changelog
+* Sat Nov 8 2025 liuh <liuhuan01@kylinos.cn> - 4.2-20
+- Grow: fix can't change bitmap type from none to clustered.
+
 * Tue Mar 18 2025 wuguanghao <wuguanghao3@huawei.com> - 4.2-19
 - super1 clear extra flags when initializing metadata