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7885 zpool list can report 16.0e for expandsz

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illumos/illumos-gate@c040c10cdd
c040c10cdd

https://www.illumos.org/issues/7885
  When a member of a RAIDZ has been replaced with a device smaller than the
  original, then the top level vdev can report its expand size as 16.0E.
  The reduced child asize causes the RAIDZ to have a vdev_asize lower than its
  vdev_max_asize which then results in an underflow during the calculation of the
  parents expand size.
  Also for RAIDZ vdevs the sum of their child vdev_min_asize could be smaller
  than the parents vdev_min_size.
  Fixed by: https://github.com/openzfs/openzfs/pull/296

Reviewed by: Matthew Ahrens <mahrens@delphix.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Approved by: Gordon Ross <gordon.w.ross@gmail.com>
Author: Steven Hartland <steven.hartland@multiplay.co.uk>
This commit is contained in:
Andriy Gapon 2017-04-14 18:28:40 +00:00
parent 2d3fcc82a1
commit 99988b024d
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/vendor-sys/illumos/dist/; revision=316919
1 changed files with 17 additions and 7 deletions
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24
uts/common/fs/zfs/vdev.c
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@ -135,7 +135,8 @@ vdev_get_min_asize(vdev_t *vd)
* so each child must provide at least 1/Nth of its asize.
*/
if (pvd->vdev_ops == &vdev_raidz_ops)
return (pvd->vdev_min_asize / pvd->vdev_children);
return ((pvd->vdev_min_asize + pvd->vdev_children - 1) /
pvd->vdev_children);
return (pvd->vdev_min_asize);
}
@ -1273,7 +1274,7 @@ vdev_open(vdev_t *vd)
vd->vdev_psize = psize;
/*
* Make sure the allocatable size hasn't shrunk.
* Make sure the allocatable size hasn't shrunk too much.
*/
if (asize < vd->vdev_min_asize) {
vdev_set_state(vd, B_TRUE, VDEV_STATE_CANT_OPEN,
@ -1306,12 +1307,21 @@ vdev_open(vdev_t *vd)
}
/*
* If all children are healthy and the asize has increased,
* then we've experienced dynamic LUN growth. If automatic
* expansion is enabled then use the additional space.
* If all children are healthy we update asize if either:
* The asize has increased, due to a device expansion caused by dynamic
* LUN growth or vdev replacement, and automatic expansion is enabled;
* making the additional space available.
*
* The asize has decreased, due to a device shrink usually caused by a
* vdev replace with a smaller device. This ensures that calculations
* based of max_asize and asize e.g. esize are always valid. It's safe
* to do this as we've already validated that asize is greater than
* vdev_min_asize.
*/
if (vd->vdev_state == VDEV_STATE_HEALTHY && asize > vd->vdev_asize &&
(vd->vdev_expanding || spa->spa_autoexpand))
if (vd->vdev_state == VDEV_STATE_HEALTHY &&
((asize > vd->vdev_asize &&
(vd->vdev_expanding || spa->spa_autoexpand)) ||
(asize < vd->vdev_asize)))
vd->vdev_asize = asize;
vdev_set_min_asize(vd);