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d54d0fff39
spa_preferred_class() selects a storage class based on (among other things) the DMU object type. This only works for old-style object types that match only one specific kind of thing. For DMU_OTN_ types we need another way to signal the storage class. This commit allows the object type to be overridden in the IO policy for the purposes of choosing a storage class. It then adds the ability to set the storage type on a dnode hold, such that all writes generated under that hold will get it. This method has two shortcomings: - it would be better if we could "name" a set of storage class preferences rather than it being implied by the object type. - it would be better if this info were stored in the dnode on disk. In the absence of those things, this seems like the smallest possible change. Reviewed-by: Alexander Motin <mav@FreeBSD.org> Reviewed-by: Tony Hutter <hutter2@llnl.gov> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Rob Norris <rob.norris@klarasystems.com> Sponsored-by: Klara, Inc. Sponsored-by: iXsystems, Inc. Closes #15894 |
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