From: NeilBrown <neilb@suse.de>
Date: Wed, 6 Aug 2014 06:34:27 +0000 (+1000)
Subject: md/raid0: check for bitmap compatability when changing raid levels.
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=a8461a61c241a25afedbe493c13d98a6e0cf4246;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git

md/raid0: check for bitmap compatability when changing raid levels.

If an array has a bitmap, then it cannot be converted to raid0.

Reported-by: Xiao Ni <xni@redhat.com>
Signed-off-by: NeilBrown <neilb@suse.de>
---

diff --git a/drivers/md/raid0.c b/drivers/md/raid0.c
index 407a99e46f69..cf91f5910c7c 100644
--- a/drivers/md/raid0.c
+++ b/drivers/md/raid0.c
@@ -685,6 +685,12 @@ static void *raid0_takeover(struct mddev *mddev)
 	 *  raid10 - assuming we have all necessary active disks
 	 *  raid1 - with (N -1) mirror drives faulty
 	 */
+
+	if (mddev->bitmap) {
+		printk(KERN_ERR "md/raid0: %s: cannot takeover array with bitmap\n",
+		       mdname(mddev));
+		return ERR_PTR(-EBUSY);
+	}
 	if (mddev->level == 4)
 		return raid0_takeover_raid45(mddev);