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dm raid: make sure no feature flags are set in metadata

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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>
This commit is contained in:
Heinz Mauelshagen 2016-04-29 18:59:56 +02:00 committed by Mike Snitzer
parent 72f6d8d8c9
commit 4c9971ca6a
1 changed files with 6 additions and 1 deletions
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7
drivers/md/dm-raid.c
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@ -1037,6 +1037,11 @@ static int super_validate(struct raid_set *rs, struct md_rdev *rdev)
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 void raid_resume(struct dm_target *ti)
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,