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dsl_dataset_promote_check: ensure that shared snaps do not become too long

Description

dsl_dataset_promote_check: ensure that shared snaps do not become too long

... after they are transfered from the old origin to the new one.

See: https://www.illumos.org/issues/5909
See: https://reviews.csiden.org/r/219/

Reviewed by: mahrens
MFC after: 10 days
Sponsored by: ClusterHQ

Details

Provenance
avgAuthored on
Reviewer
mahrens
Parents
rS283523: MFC r282475: zfs: do not hold an extra reference on a root vnode
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