[Bug 211939] ZFS does not correctly import cache and spares by label

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=211939

            Bug ID: 211939
           Summary: ZFS does not correctly import cache and spares by
                    label
           Product: Base System
           Version: 10.3-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Many People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: ben.rubson at gmail.com

Hello,

ZFS does not correctly import cache and spares by label, which is quite
annoying.

Example :

# zpool add home cache label/G12000KU2RVJAch
# zpool add home spare label/G1207PFGPTKDXhm 
# zpool status home
 (...)
 home                       ONLINE       0     0     0
   mirror-0                 ONLINE       0     0     0
     label/G1203PGGLJWZXhm  ONLINE       0     0     0
     label/G1204PHKXHJ2Xhm  ONLINE       0     0     0
 (...)
 logs
   mirror-2                 ONLINE       0     0     0
     label/G12000KU2RVJAlg  ONLINE       0     0     0
     label/G12010KU22RVAlg  ONLINE       0     0     0
 (...)
 cache
   label/G12000KU2RVJAch    ONLINE       0     0     0
 spares
   label/G1207PFGPTKDXhm    AVAIL

# zpool export home
# zpool import -d /dev/label/ home
# zpool status home
 (...)
 home                       ONLINE       0     0     0
   mirror-0                 ONLINE       0     0     0
     label/G1203PGGLJWZXhm  ONLINE       0     0     0
     label/G1204PHKXHJ2Xhm  ONLINE       0     0     0
 (...)
 logs
   mirror-2                 ONLINE       0     0     0
     label/G12000KU2RVJAlg  ONLINE       0     0     0
     label/G12010KU22RVAlg  ONLINE       0     0     0
 (...)
 cache
   da5p7                    ONLINE       0     0     0
 spares
   da4p1                    AVAIL

# uname -v
FreeBSD 10.3-RELEASE-p7 #0: Thu Aug 11 18:38:15 UTC 2016
root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC 

I tested this pool under FreeBSD 11-RC1, the issue does not occur, cache and
spares are correctly imported with their label.
Could it be possible to backport required changes to 10.3 ?

Thank you very much,

Best regards,

Ben

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