w32: Fix access to host devices (regression)

QEMU failed to open host devices like \\.\PhysicalDrive0 (first hard disk)
since some time (commit 8a79380b8ef1b02d2abd705dd026a18863b09020?).

Those devices use hdev_open which did not use the latest API for options.
This resulted in a fatal runtime error:

  Block protocol 'host_device' doesn't support the option 'filename'

Duplicate code from raw_open to fix this.

Cc: qemu-stable@nongnu.org
Reported-by: David Brenner <david.brenner3@gmail.com>
Signed-off-by: Stefan Weil <sw@weilnetz.de>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
(cherry picked from commit 68dc036488dfea170627a55e6ee3dfd7f2c2063e)

Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>

1 files changed, 31 insertions, 8 deletions

diff --git a/block/raw-win32.c b/block/raw-win32.c
index ae2a98caa7..9686afe702 100644
--- a/block/raw-win32.c
+++ b/block/raw-win32.c
@@ -578,18 +578,34 @@ static int hdev_probe_device(const char *filename)
 static int hdev_open(BlockDriverState *bs, QDict *options, int flags)
 {
     BDRVRawState *s = bs->opaque;
-    char device_name[64];
-    const char *filename = qdict_get_str(options, "filename");
 #ifndef CONFIG_MARU
     int access_flags, create_flags;
     DWORD overlapped;
 #else
-    int open_flags, ret;
+    int open_flags;
 #endif
+    int ret = 0;
+    char device_name[64];
+
+    Error *local_err = NULL;
+    const char *filename;
+
+    QemuOpts *opts = qemu_opts_create_nofail(&raw_runtime_opts);
+    qemu_opts_absorb_qdict(opts, options, &local_err);
+    if (error_is_set(&local_err)) {
+        qerror_report_err(local_err);
+        error_free(local_err);
+        ret = -EINVAL;
+        goto done;
+    }
+
+    filename = qemu_opt_get(opts, "filename");
 
     if (strstart(filename, "/dev/cdrom", NULL)) {
-        if (find_cdrom(device_name, sizeof(device_name)) < 0)
-            return -ENOENT;
+        if (find_cdrom(device_name, sizeof(device_name)) < 0) {
+            ret = -ENOENT;
+            goto done;
+        }
         filename = device_name;
     } else {
         /* transform drive letters into device name */
@@ -613,9 +629,12 @@ static int hdev_open(BlockDriverState *bs, QDict *options, int flags)
 	if (s->hfile == INVALID_HANDLE_VALUE) {
         int err = GetLastError();
 
-        if (err == ERROR_ACCESS_DENIED)
-            return -EACCES;
-        return -1;
+        if (err == ERROR_ACCESS_DENIED) {
+            ret = -EACCES;
+        } else {
+            ret = -1;
+        }
+        goto done;
     }
 #else
 	/*
@@ -650,6 +669,10 @@ static int hdev_open(BlockDriverState *bs, QDict *options, int flags)
     s->hfile = (HANDLE)_get_osfhandle(ret);
 #endif
     return 0;
+
+done:
+    qemu_opts_del(opts);
+    return ret;
 }
 
 static BlockDriver bdrv_host_device = {