This adds code to scsi_vpd_lun_id() to enable it to use T10 vendor ID
based designators. This is needed to allow alua to work on disks that
don't have any designators of type 2, 3 or 8. Commit 0047220c6c36
("scsi_dh_alua: use unique device id", 2016-02-19) added a requirement
that alua can only be used on disks for which scsi_vpd_lun_id() can
produce an identifying string.
Signed-off-by: Paul Mackerras <paulus@xxxxxxxxxx>
---
drivers/scsi/scsi_lib.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 8106515..f4f69cc 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -3214,6 +3214,20 @@ int scsi_vpd_lun_id(struct scsi_device *sdev, char *id, size_t id_len)
goto next_desig;
switch (d[1] & 0xf) {
+ case 0x1:
+ /* T10 vendor ID */
+ if (cur_id_size > d[3])
+ break;
+ /* Prefer EUI-64 or NAA IEEE Registered Extended */
+ if ((cur_id_type == 0x2 || cur_id_type == 0x3) &&
+ cur_id_size == d[3])
+ break;
+ cur_id_size = d[3];
+ cur_id_str = d + 4;
+ cur_id_type = d[1] & 0xf;
+ id_size = snprintf(id, id_len, "%*phN", cur_id_size,
+ cur_id_str);
+ break;
case 0x2:
/* EUI-64 */
if (cur_id_size > d[3])
--
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