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Create zap for root vdev

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And add it to the AVZ, this is not backwards compatible with older pools
due to an assertion in spa_sync() that verifies the number of ZAPs of
all vdevs matches the number of ZAPs in the AVZ.

Granted, the assertion only applies to #DEBUG builds - still, a feature
flag is introduced to avoid the assertion, com.klarasystems:vdev_zaps_v2

Notably, this allows to get/set properties on the root vdev:

    % zpool set user:prop=value <pool> root-0

Before this commit, it was already possible to get/set properties on
top-level vdevs with the syntax <type>-<vdev_id> (e.g. mirror-0):

    % zpool set user:prop=value <pool> mirror-0

This syntax also applies to the root vdev as it is is of type 'root'
with a vdev_id of 0, root-0. The keyword 'root' as an alias for
'root-0'.

The following tests have been added:

    - zpool get all properties from root vdev
    - zpool set a property on root vdev
    - verify root vdev ZAP is created

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Wing <rob.wing@klarasystems.com>
Sponsored-by: Seagate Technology
Submitted-by: Klara, Inc.
Closes #14405
This commit is contained in:
rob-wing
2023-04-20 09:07:56 -08:00
committed by GitHub
parent 71d191ef25
commit 3e4ed4213d
27 changed files with 339 additions and 38 deletions
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module/zfs/vdev_label.c
+6
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@@ -573,6 +573,12 @@ vdev_config_generate(spa_t *spa, vdev_t *vd, boolean_t getstats,
vd->vdev_top_zap);
}
if (vd->vdev_ops == &vdev_root_ops && vd->vdev_root_zap != 0 &&
spa_feature_is_active(vd->vdev_spa, SPA_FEATURE_AVZ_V2)) {
fnvlist_add_uint64(nv, ZPOOL_CONFIG_VDEV_ROOT_ZAP,
vd->vdev_root_zap);
}
if (vd->vdev_resilver_deferred) {
ASSERT(vd->vdev_ops->vdev_op_leaf);
ASSERT(spa->spa_resilver_deferred);