linux-kernel - [PATCH 3.2 009/107] target: REPORT LUNS should return LUN 0 even for dynamic ACLs

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Message-ID: <lsq.1444349547.846807509@decadent.org.uk>
Date:	Fri, 09 Oct 2015 01:12:27 +0100
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Roland Dreier" <roland@...estorage.com>,
	"Nicholas Bellinger" <nab@...ux-iscsi.org>
Subject: [PATCH 3.2 009/107] target: REPORT LUNS should return LUN 0 even
 for dynamic ACLs

3.2.72-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Roland Dreier <roland@...estorage.com>

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@...estorage.com>
Signed-off-by: Nicholas Bellinger <nab@...ux-iscsi.org>
[bwh: Backported to 3.2: adjust filename, context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/target/target_core_device.c | 14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

--- 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 *s
 	 * 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 *s
 	 * 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);

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