Author: tsoome
Date: Mon Oct 24 16:28:54 2016
New Revision: 307865
URL: https://svnweb.freebsd.org/changeset/base/307865

Log:
  loader should boot pre-feature flags pools.
  
  The feature flags chek is missing the corner case where we have valid pool
  version, but feature flags are not enabled - as for example plain v28 pool.
  
  This update does fix the boot support for such pools.
  
  Reviewed by:  avg, allanjude
  Approved by:  allanjude (mentor)
  Differential Revision:        https://reviews.freebsd.org/D8331

Modified:
  head/sys/boot/zfs/zfsimpl.c

Modified: head/sys/boot/zfs/zfsimpl.c
==============================================================================
--- head/sys/boot/zfs/zfsimpl.c Mon Oct 24 14:56:13 2016        (r307864)
+++ head/sys/boot/zfs/zfsimpl.c Mon Oct 24 16:28:54 2016        (r307865)
@@ -2122,8 +2122,13 @@ check_mos_features(const spa_t *spa)
            &dir)) != 0)
                return (rc);
        if ((rc = zap_lookup(spa, &dir, DMU_POOL_FEATURES_FOR_READ,
-           sizeof (objnum), 1, &objnum)) != 0)
-               return (rc);
+           sizeof (objnum), 1, &objnum)) != 0) {
+               /*
+                * It is older pool without features. As we have already
+                * tested the label, just return without raising the error.
+                */
+               return (0);
+       }
 
        if ((rc = objset_get_dnode(spa, &spa->spa_mos, objnum, &dir)) != 0)
                return (rc);
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