MFC r264274, r264279, r264283, r264296, r264297:

Add support for SCSI UNMAP commands to CTL.

This patch adds support for three new SCSI commands: UNMAP, WRITE SAME(10)
and WRITE SAME(16).  WRITE SAME commands support both normal write mode
and UNMAP flag.  To properly report UNMAP capabilities this patch also adds
support for reporting two new VPD pages: Block limits and Logical Block
Provisioning.

UNMAP support can be enabled per-LUN by adding "-o unmap=on" to `ctladm
create` command line or "option unmap on" to lun sections of /etc/ctl.conf.

At this moment UNMAP supported for ramdisks and device-backed block LUNs.
It was tested to work great with ZFS ZVOLs.  For file-backed LUNs UNMAP
support is unfortunately missing due to absence of respective VFS KPI.

Sponsored by:   iXsystems, Inc

1 files changed, 14 insertions, 0 deletions

diff --git a/sys/cam/scsi/scsi_all.h b/sys/cam/scsi/scsi_all.h
index 83b7041..0fa121f 100644
--- a/sys/cam/scsi/scsi_all.h
+++ b/sys/cam/scsi/scsi_all.h
@@ -854,6 +854,20 @@ struct scsi_unmap
 	uint8_t	control;
 };
 
+struct scsi_unmap_header
+{
+	uint8_t	length[2];
+	uint8_t	desc_length[2];
+	uint8_t	reserved[4];
+};
+
+struct scsi_unmap_desc
+{
+	uint8_t	lba[8];
+	uint8_t	length[4];
+	uint8_t	reserved[4];
+};
+
 struct scsi_write_verify_10
 {
 	uint8_t	opcode;