Promotes a clone file system to no longer be
dependent on its origin snapshot.
promote command makes it possible
to destroy the file system that the clone was created from. The clone
parent-child dependency relationship is reversed, so that the origin file
system becomes a clone of the specified file system.
The snapshot that was cloned, and any snapshots previous to this snapshot,
are now owned by the promoted clone. The space they use moves from the
origin file system to the promoted clone, so enough space must be
available to accommodate these snapshots. No new space is consumed by this
operation, but the space accounting is adjusted. The promoted clone must
not have any conflicting snapshot names of its own. The
zfs-rename(8) subcommand can be used to
rename any conflicting snapshots.