block: Remove a special case for protocols

The only semantic change is that bs->open_flags gets BDRV_O_PROTOCOL set
now. This isn't useful, but it doesn't hurt either. The code that was
previously skipped by 'goto done' is automatically disabled because
protocol drivers don't support backing files (and if they did, this
would probably be a fix) and can't have snapshot_flags set.

Signed-off-by: Kevin Wolf <[email protected]>
Reviewed-by: Eric Blake <[email protected]>

block.c

@@ -831,7 +831,7 @@ static int bdrv_open_flags(BlockDriverState *bs, int flags)
      * Clear flags that are internal to the block layer before opening the
      * image.
      */
-    open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING);
+    open_flags &= ~(BDRV_O_SNAPSHOT | BDRV_O_NO_BACKING | BDRV_O_PROTOCOL);
 
     /*
      * Snapshots should be writable.
@@ -928,6 +928,7 @@ static int bdrv_open_common(BlockDriverState *bs, BlockDriverState *file,
     bs->zero_beyond_eof = true;
     open_flags = bdrv_open_flags(bs, flags);
     bs->read_only = !(open_flags & BDRV_O_RDWR);
+    bs->growable = !!(flags & BDRV_O_PROTOCOL);
 
     if (use_bdrv_whitelist && !bdrv_is_whitelisted(drv, bs->read_only)) {
         error_setg(errp,
@@ -1466,19 +1467,6 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
     }
 
     /* Open the image */
-    if (flags & BDRV_O_PROTOCOL) {
-        ret = bdrv_open_common(bs, NULL, options,
-                               flags & ~BDRV_O_PROTOCOL, drv, &local_err);
-        if (!ret) {
-            bs->growable = 1;
-            goto done;
-        } else if (bs->drv) {
-            goto close_and_fail;
-        } else {
-            goto fail;
-        }
-    }
-
     ret = bdrv_open_common(bs, file, options, flags, drv, &local_err);
     if (ret < 0) {
         goto fail;
@@ -1510,8 +1498,6 @@ int bdrv_open(BlockDriverState **pbs, const char *filename,
         }
     }
 
-
-done:
     /* Check if any unknown options were used */
     if (options && (qdict_size(options) != 0)) {
         const QDictEntry *entry = qdict_first(options);