Author: mav
Date: Thu Aug  2 23:52:29 2018
New Revision: 337208
URL: https://svnweb.freebsd.org/changeset/base/337208

Log:
  9591 ms_shift can be incorrectly changed in MOS config for indirect vdevs 
that have been historically expanded
  
  illumos/illumos-gate@11f6a9680e013a7c9c57dc0b64d3e91e2eee1a6b
  
  Reviewed by: Matthew Ahrens <[email protected]>
  Reviewed by: George Wilson <[email protected]>
  Reviewed by: John Kennedy <[email protected]>
  Reviewed by: Prashanth Sreenivasa <[email protected]>
  Reviewed by: Tim Chase <[email protected]>
  Approved by: Richard Lowe <[email protected]>
  Author:     Serapheim Dimitropoulos <[email protected]>

Modified:
  vendor-sys/illumos/dist/uts/common/fs/zfs/spa_config.c
  vendor-sys/illumos/dist/uts/common/fs/zfs/vdev.c

Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/spa_config.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/spa_config.c      Thu Aug  2 
23:50:03 2018        (r337207)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/spa_config.c      Thu Aug  2 
23:52:29 2018        (r337208)
@@ -22,7 +22,7 @@
 /*
  * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
  * Copyright 2011 Nexenta Systems, Inc. All rights reserved.
- * Copyright (c) 2011, 2015 by Delphix. All rights reserved.
+ * Copyright (c) 2011, 2018 by Delphix. All rights reserved.
  * Copyright 2017 Joyent, Inc.
  */
 
@@ -510,6 +510,18 @@ spa_config_update(spa_t *spa, int what)
                 */
                for (c = 0; c < rvd->vdev_children; c++) {
                        vdev_t *tvd = rvd->vdev_child[c];
+
+                       /*
+                        * Explicitly skip vdevs that are indirect or
+                        * log vdevs that are being removed. The reason
+                        * is that both of those can have vdev_ms_array
+                        * set to 0 and we wouldn't want to change their
+                        * metaslab size nor call vdev_expand() on them.
+                        */
+                       if (!vdev_is_concrete(tvd) ||
+                           (tvd->vdev_islog && tvd->vdev_removing))
+                               continue;
+
                        if (tvd->vdev_ms_array == 0)
                                vdev_metaslab_set_size(tvd);
                        vdev_expand(tvd, txg);

Modified: vendor-sys/illumos/dist/uts/common/fs/zfs/vdev.c
==============================================================================
--- vendor-sys/illumos/dist/uts/common/fs/zfs/vdev.c    Thu Aug  2 23:50:03 
2018        (r337207)
+++ vendor-sys/illumos/dist/uts/common/fs/zfs/vdev.c    Thu Aug  2 23:52:29 
2018        (r337208)
@@ -4086,11 +4086,11 @@ vdev_expand(vdev_t *vd, uint64_t txg)
 {
        ASSERT(vd->vdev_top == vd);
        ASSERT(spa_config_held(vd->vdev_spa, SCL_ALL, RW_WRITER) == SCL_ALL);
+       ASSERT(vdev_is_concrete(vd));
 
        vdev_set_deflate_ratio(vd);
 
-       if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count &&
-           vdev_is_concrete(vd)) {
+       if ((vd->vdev_asize >> vd->vdev_ms_shift) > vd->vdev_ms_count) {
                VERIFY(vdev_metaslab_init(vd, txg) == 0);
                vdev_config_dirty(vd);
        }
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