From 20dcbb9776926fea51e6178298ed76f2c64a1d03 Mon Sep 17 00:00:00 2001

From: Fam Zheng <famz@redhat.com>

Date: Fri, 29 Jun 2018 06:11:46 +0200

Subject: [PATCH 42/57] iscsi: Query and save device designator when opening

RH-Author: Fam Zheng <famz@redhat.com>

Message-id: <20180629061153.12687-7-famz@redhat.com>

Patchwork-id: 81157

O-Subject: [RHEL-7.6 qemu-kvm-rhev PATCH v2 06/13] iscsi: Query and save device designator when opening

Bugzilla: 1482537

RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>

RH-Acked-by: Max Reitz <mreitz@redhat.com>

RH-Acked-by: Kevin Wolf <kwolf@redhat.com>

The device designator data returned in INQUIRY command will be useful to

fill in source/target fields during copy offloading. Do this when

connecting to the target and save the data for later use.

Signed-off-by: Fam Zheng <famz@redhat.com>

Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>

Message-id: 20180601092648.24614-7-famz@redhat.com

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

(cherry picked from commit cc9743c236cce8a35449e3ef67140287b68bb705)

Signed-off-by: Fam Zheng <famz@redhat.com>

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>

---

 block/iscsi.c | 41 +++++++++++++++++++++++++++++++++++++++++

 1 file changed, 41 insertions(+)

diff --git a/block/iscsi.c b/block/iscsi.c

index 1705187..a1a0044 100644

--- a/block/iscsi.c

+++ b/block/iscsi.c

@@ -69,6 +69,7 @@ typedef struct IscsiLun {

     QemuMutex mutex;

     struct scsi_inquiry_logical_block_provisioning lbp;

     struct scsi_inquiry_block_limits bl;

+    struct scsi_inquiry_device_designator *dd;

     unsigned char *zeroblock;

     /* The allocmap tracks which clusters (pages) on the iSCSI target are

      * allocated and which are not. In case a target returns zeros for

@@ -1737,6 +1738,30 @@ static QemuOptsList runtime_opts = {

     },

 };

+static void iscsi_save_designator(IscsiLun *lun,

+                                  struct scsi_inquiry_device_identification *inq_di)

+{

+    struct scsi_inquiry_device_designator *desig, *copy = NULL;

+

+    for (desig = inq_di->designators; desig; desig = desig->next) {

+        if (desig->association ||

+            desig->designator_type > SCSI_DESIGNATOR_TYPE_NAA) {

+            continue;

+        }

+        /* NAA works better than T10 vendor ID based designator. */

+        if (!copy || copy->designator_type < desig->designator_type) {

+            copy = desig;

+        }

+    }

+    if (copy) {

+        lun->dd = g_new(struct scsi_inquiry_device_designator, 1);

+        *lun->dd = *copy;

+        lun->dd->next = NULL;

+        lun->dd->designator = g_malloc(copy->designator_length);

+        memcpy(lun->dd->designator, copy->designator, copy->designator_length);

+    }

+}

+

 static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,

                       Error **errp)

 {

@@ -1904,6 +1929,7 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,

         struct scsi_task *inq_task;

         struct scsi_inquiry_logical_block_provisioning *inq_lbp;

         struct scsi_inquiry_block_limits *inq_bl;

+        struct scsi_inquiry_device_identification *inq_di;

         switch (inq_vpd->pages[i]) {

         case SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING:

             inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,

@@ -1929,6 +1955,17 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,

                    sizeof(struct scsi_inquiry_block_limits));

             scsi_free_scsi_task(inq_task);

             break;

+        case SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION:

+            inq_task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,

+                                    SCSI_INQUIRY_PAGECODE_DEVICE_IDENTIFICATION,

+                                    (void **) &inq_di, errp);

+            if (inq_task == NULL) {

+                ret = -EINVAL;

+                goto out;

+            }

+            iscsi_save_designator(iscsilun, inq_di);

+            scsi_free_scsi_task(inq_task);

+            break;

         default:

             break;

         }

@@ -1985,6 +2022,10 @@ static void iscsi_close(BlockDriverState *bs)

         iscsi_logout_sync(iscsi);

     }

     iscsi_destroy_context(iscsi);

+    if (iscsilun->dd) {

+        g_free(iscsilun->dd->designator);

+        g_free(iscsilun->dd);

+    }

     g_free(iscsilun->zeroblock);

     iscsi_allocmap_free(iscsilun);

     qemu_mutex_destroy(&iscsilun->mutex);

-- 

1.8.3.1