[Qemu-devel] [PATCHv2 02/11] iscsi: read unmap info from block limits vpd page

[Peter Lieven <pl@kamp.de>]

Signed-off-by: Peter Lieven <pl@kamp.de>
---
 block/iscsi.c |   80 ++++++++++++++++++++++++++++++++++++++++-----------------
 1 file changed, 56 insertions(+), 24 deletions(-)

diff --git a/block/iscsi.c b/block/iscsi.c
index a38a1bf..2e2455d 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -54,6 +54,8 @@ typedef struct IscsiLun {
     uint8_t lbpu;
     uint8_t lbpws;
     uint8_t lbpws10;
+    uint32_t max_unmap;
+    uint32_t max_unmap_bdc;
 } IscsiLun;
 
 typedef struct IscsiAIOCB {
@@ -1007,6 +1009,37 @@ static QemuOptsList runtime_opts = {
     },
 };
 
+static struct scsi_task *iscsi_do_inquiry(struct iscsi_context *iscsi,
+                                          int lun, int evpd, int pc) {
+        int full_size;
+        struct scsi_task *task = NULL;
+        task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, 64);
+        if (task == NULL || task->status != SCSI_STATUS_GOOD) {
+            goto fail;
+        }
+        full_size = scsi_datain_getfullsize(task);
+        if (full_size > task->datain.size) {
+            scsi_free_scsi_task(task);
+
+            /* we need more data for the full list */
+            task = iscsi_inquiry_sync(iscsi, lun, evpd, pc, full_size);
+            if (task == NULL || task->status != SCSI_STATUS_GOOD) {
+                goto fail;
+            }
+        }
+
+        return task;
+
+fail:
+        error_report("iSCSI: Inquiry command failed : %s",
+                     iscsi_get_error(iscsi));
+        if (task) {
+            scsi_free_scsi_task(task);
+            return NULL;
+        }
+        return NULL;
+}
+
 /*
  * We support iscsi url's on the form
  * iscsi://[<username>%<password>@]<host>[:<port>]/<targetname>/<lun>
@@ -1139,33 +1172,12 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags)
 
     if (iscsilun->lbpme) {
         struct scsi_inquiry_logical_block_provisioning *inq_lbp;
-        int full_size;
-
-        task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 1,
-                                  SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
-                                  64);
-        if (task == NULL || task->status != SCSI_STATUS_GOOD) {
-            error_report("iSCSI: Inquiry command failed : %s",
-                   iscsi_get_error(iscsilun->iscsi));
+        task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
+                                SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING);
+        if (task == NULL) {
             ret = -EINVAL;
             goto out;
         }
-        full_size = scsi_datain_getfullsize(task);
-        if (full_size > task->datain.size) {
-            scsi_free_scsi_task(task);
-
-            /* we need more data for the full list */
-            task = iscsi_inquiry_sync(iscsi, iscsilun->lun, 1,
-                                      SCSI_INQUIRY_PAGECODE_LOGICAL_BLOCK_PROVISIONING,
-                                      full_size);
-            if (task == NULL || task->status != SCSI_STATUS_GOOD) {
-                error_report("iSCSI: Inquiry command failed : %s",
-                             iscsi_get_error(iscsilun->iscsi));
-                ret = -EINVAL;
-                goto out;
-            }
-        }
-
         inq_lbp = scsi_datain_unmarshall(task);
         if (inq_lbp == NULL) {
             error_report("iSCSI: failed to unmarshall inquiry datain blob");
@@ -1175,6 +1187,26 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags)
         iscsilun->lbpu = inq_lbp->lbpu;
         iscsilun->lbpws = inq_lbp->lbpws;
         iscsilun->lbpws10 = inq_lbp->lbpws10;
+        scsi_free_scsi_task(task);
+        task = NULL;
+    }
+
+    if (iscsilun->lbpu) {
+        struct scsi_inquiry_block_limits *inq_bl;
+        task = iscsi_do_inquiry(iscsilun->iscsi, iscsilun->lun, 1,
+                                SCSI_INQUIRY_PAGECODE_BLOCK_LIMITS);
+        if (task == NULL) {
+            ret = -EINVAL;
+            goto out;
+        }
+        inq_bl = scsi_datain_unmarshall(task);
+        if (inq_bl == NULL) {
+            error_report("iSCSI: failed to unmarshall inquiry datain blob");
+            ret = -EINVAL;
+            goto out;
+        }
+        iscsilun->max_unmap = inq_bl->max_unmap;
+        iscsilun->max_unmap_bdc = inq_bl->max_unmap_bdc;
     }
 
 #if defined(LIBISCSI_FEATURE_NOP_COUNTER)
-- 
1.7.9.5