dm raid: prohibit 'nosync' on new raid6 and reject resize during reshape

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>

1 files changed, 15 insertions, 3 deletions

diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 7e334b65b1c3..6dc494055267 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -2752,9 +2752,21 @@ static int raid_ctr(struct dm_target *ti, unsigned argc, char **argv)
         if (test_bit(MD_ARRAY_FIRST_USE, &rs->md.flags)) {
                 set_bit(RT_FLAG_UPDATE_SBS, &rs->runtime_flags);
                 rs_set_new(rs);
-        } else if (rs_is_reshaping(rs))
-                ; /* skip rs setup */
-        else if (rs_takeover_requested(rs)) {
+                /* A new raid6 set has to be recovered to ensure proper parity and Q-Syndrome */
+                if (rs_is_raid6(rs) &&
+                    test_bit(__CTR_FLAG_NOSYNC, &rs->ctr_flags)) {
+                        ti->error = "'nosync' not allowed for new raid6 set";
+                        return -EINVAL;
+                }
+                rs_setup_recovery(rs, 0);
+        } else if (rs_is_reshaping(rs)) {
+                /* Have to reject size change request during reshape */
+                if (calculated_dev_sectors != rs->dev[0].rdev.sectors) {
+                        ti->error = "Can't resize a reshaping raid set";
+                        return -EPERM;
+                }
+                /* skip setup rs */
+        } else if (rs_takeover_requested(rs)) {
                 if (rs_is_reshaping(rs)) {
                         ti->error = "Can't takeover a reshaping raid set";
                         return -EPERM;