From 55eff7c7c9dea635415014de0ab460dae7eef13d Mon Sep 17 00:00:00 2001
From: Jeffrey Cody <jcody@redhat.com>
Date: Thu, 15 Jun 2017 15:50:29 +0200
Subject: [PATCH 4/8] block/iscsi: enable filename option and parsing

RH-Author: Jeffrey Cody <jcody@redhat.com>
Message-id: <ab286875a7ab2fcbc16ce104efbd55455bc582f5.1497541513.git.jcody@redhat.com>
Patchwork-id: 75615
O-Subject: [RHEV-7.4 qemu-kvm-rhev PATCH 2/2] block/iscsi: enable filename option and parsing
Bugzilla: 1457088
RH-Acked-by: Juan Quintela <quintela@redhat.com>
RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Richard Jones <rjones@redhat.com>

When enabling option parsing and blockdev-add for iscsi, we removed the
'filename' option.  Unfortunately, this was a bit optimistic, as
previous versions of QEMU allowed the use of the option in backing
filenames via json.  This means that without parsing this option, we
cannot open existing images that used to work fine.

See bug: https://bugzilla.redhat.com/show_bug.cgi?id=1457088

Tested-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
Message-id: 0789ab6c32814ab4b6896707d378804bd4424c65.1497444637.git.jcody@redhat.com
Signed-off-by: Jeff Cody <jcody@redhat.com>
(cherry picked from commit 5c3ad1a6a8fa041c57403dbe1fc5927eec0be66b)
Signed-off-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
 block/iscsi.c | 22 +++++++++++++++++++++-
 1 file changed, 21 insertions(+), 1 deletion(-)

diff --git a/block/iscsi.c b/block/iscsi.c
index 42fb0b0..2d16861 100644
--- a/block/iscsi.c
+++ b/block/iscsi.c
@@ -1732,6 +1732,10 @@ static QemuOptsList runtime_opts = {
             .name = "timeout",
             .type = QEMU_OPT_NUMBER,
         },
+        {
+            .name = "filename",
+            .type = QEMU_OPT_STRING,
+        },
         { /* end of list */ }
     },
 };
@@ -1747,12 +1751,27 @@ static int iscsi_open(BlockDriverState *bs, QDict *options, int flags,
     char *initiator_name = NULL;
     QemuOpts *opts;
     Error *local_err = NULL;
-    const char *transport_name, *portal, *target;
+    const char *transport_name, *portal, *target, *filename;
 #if LIBISCSI_API_VERSION >= (20160603)
     enum iscsi_transport_type transport;
 #endif
     int i, ret = 0, timeout = 0, lun;
 
+    /* If we are given a filename, parse the filename, with precedence given to
+     * filename encoded options */
+    filename = qdict_get_try_str(options, "filename");
+    if (filename) {
+        error_report("Warning: 'filename' option specified. "
+                      "This is an unsupported option, and may be deprecated "
+                      "in the future");
+        iscsi_parse_filename(filename, options, &local_err);
+        if (local_err) {
+            ret = -EINVAL;
+            error_propagate(errp, local_err);
+            goto exit;
+        }
+    }
+
     opts = qemu_opts_create(&runtime_opts, NULL, 0, &error_abort);
     qemu_opts_absorb_qdict(opts, options, &local_err);
     if (local_err) {
@@ -1967,6 +1986,7 @@ out:
         }
         memset(iscsilun, 0, sizeof(IscsiLun));
     }
+exit:
     return ret;
 }
 
-- 
1.8.3.1