Alexander Motin 2823b6467a Postpone ZVOL media/block size caching till first open. ... At least on FreeBSD there are no legal way to access media or get its size without opening device/provider first. Postponing this caching allows to skip several disk seeks per ZVOL/snapshot during import. For HDD pool with 1 ZVOL in dev mode with 1000 snapshots this reduces pool import time from 40 to 10 seconds. MFC after: 2 weeks Sponsored by: iXsystems, Inc.		2016-12-11 19:50:39 +00:00
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opensolaris	Postpone ZVOL media/block size caching till first open.	2016-12-11 19:50:39 +00:00