MFC r279957, r280017: Add DSM TRIM command support for virtual AHCI disks.
It works only for virtual disks backed by ZVOLs and raw devices supporting
BIO_DELETE. Virtual disks backed by files won't report this capability.
Relnotes: yes
MFC r279957, r280017: Add DSM TRIM command support for virtual AHCI disks. Tags None Referenced Files None Subscribers None
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