dm raid: make sure no feature flags are set in metadata
Given we don't yet support any feature flags in the dm-raid ondisk
metadata (see: 'features' member of 'struct dm_raid_superblock'),
add a check to ensure no flags are actually set, if any features are
set reject the activation of the RAID mapping.
This is to prevent possible data corruption in case of a kernel
downgrade when there'll potentially be feature flags set by a future
dm-raid target.
Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index a090121..5253274 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -1037,6 +1037,11 @@
if (!mddev->events && super_init_validation(mddev, rdev))
return -EINVAL;
+ if (le32_to_cpu(sb->features)) {
+ rs->ti->error = "Unable to assemble array: No feature flags supported yet";
+ return -EINVAL;
+ }
+
/* Enable bitmap creation for RAID levels != 0 */
mddev->bitmap_info.offset = (rs->raid_type->level) ? to_sector(4096) : 0;
rdev->mddev->bitmap_info.default_offset = mddev->bitmap_info.offset;
@@ -1718,7 +1723,7 @@
static struct target_type raid_target = {
.name = "raid",
- .version = {1, 7, 0},
+ .version = {1, 8, 0},
.module = THIS_MODULE,
.ctr = raid_ctr,
.dtr = raid_dtr,