md: don't allow bitmap file to be added to raid0/linear.
An array can only accept a bitmap if it will call bitmap_daemon_work
periodically, which means it needs a thread running.
If there is no thread, don't allow a bitmap to be added.
Signed-off-by: NeilBrown <neilb@suse.de>
diff --git a/drivers/md/md.c b/drivers/md/md.c
index eb8c93d..1294238 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5961,7 +5961,7 @@
int err = 0;
if (mddev->pers) {
- if (!mddev->pers->quiesce)
+ if (!mddev->pers->quiesce || !mddev->thread)
return -EBUSY;
if (mddev->recovery || mddev->sync_thread)
return -EBUSY;
@@ -6263,7 +6263,7 @@
rv = update_raid_disks(mddev, info->raid_disks);
if ((state ^ info->state) & (1<<MD_SB_BITMAP_PRESENT)) {
- if (mddev->pers->quiesce == NULL)
+ if (mddev->pers->quiesce == NULL || mddev->thread == NULL)
return -EINVAL;
if (mddev->recovery || mddev->sync_thread)
return -EBUSY;