target: Implement Block Device Characteristics VPD page

Implement page B1h, Block Device Characteristics, so that we can report
a medium rotation rate of 1 (non-rotating / solid state) if the
is_nonrot device attribute is set; we update the iblock backend to set
this attribute if the underlying Linux block device has its nonrot
flag set.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index cd163dd..81deb39 100644
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -661,6 +661,7 @@ struct se_dev_attrib {
 	int		emulate_reservations;
 	int		emulate_alua;
 	int		enforce_pr_isids;
+	int		is_nonrot;
 	u32		hw_block_size;
 	u32		block_size;
 	u32		hw_max_sectors;