target: REPORT LUNS should return LUN 0 even for dynamic ACLs

commit 9c395170a559d3b23dad100b01fc4a89d661c698 upstream.

If an initiator doesn't have any real LUNs assigned, we should report
LUN 0 and a LUN list length of 1.  Some versions of Solaris at least
go beserk if we report a LUN list length of 0.

Signed-off-by: Roland Dreier <roland@purestorage.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 6993961..c3cf95e 100644 (file)
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -668,11 +668,8 @@ int target_report_luns(struct se_task *se_task)
         * coming via a target_core_mod PASSTHROUGH op, and not through
         * a $FABRIC_MOD.  In that case, report LUN=0 only.
         */
-       if (!se_sess) {
-               int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
-               lun_count = 1;
+       if (!se_sess)
                goto done;
-       }
 
        spin_lock_irq(&se_sess->se_node_acl->device_list_lock);
        for (i = 0; i < TRANSPORT_MAX_LUNS_PER_TPG; i++) {
@@ -699,6 +696,14 @@ int target_report_luns(struct se_task *se_task)
         * See SPC3 r07, page 159.
         */
 done:
+       /*
+        * If no LUNs are accessible, report virtual LUN 0.
+        */
+       if (lun_count == 0) {
+               int_to_scsilun(0, (struct scsi_lun *)&buf[offset]);
+               lun_count = 1;
+       }
+
        lun_count *= 8;
        buf[0] = ((lun_count >> 24) & 0xff);
        buf[1] = ((lun_count >> 16) & 0xff);