ISCSI: Add support for thin-provisioning via discard/UNMAP and bigger LUNs
Update the configure test for libiscsi support to detect version 1.3 or later. Version 1.3 of libiscsi provides both READCAPACITY16 as well as UNMAP commands. Update the iscsi block layer to use READCAPACITY16 to detect the size of the LUN instead of READCAPACITY10. This allows support for LUNs larger than 2TB. Update to implement bdrv_aio_discard() using the UNMAP command. This allows us to use thin-provisioned LUNs from TGTD and other iSCSI targets that support thin-provisioning. Signed-off-by: NRonnie Sahlberg <ronniesahlberg@gmail.com> [squashed in subsequent patch from Ronnie to fix off-by-one in LBA count] Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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