block migration: Fix test for read-only drive

init_blk_migration_it() skips drives with type hint BDRV_TYPE_CDROM.
The intention is to skip read-only drives.  However, BDRV_TYPE_CDROM
is only a hint.  It is currently sufficent for read-only.  But it's
not necessary, and it may not remain sufficient.

Use bdrv_is_read_only() instead.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

diff --git a/block-migration.c b/block-migration.c
index 7d04d6db0a30a82f15bae8fdbb9579956d432b2d..7337349e83a9f12b56e04803c8efb79999d7e500 100644 (file)
--- a/block-migration.c
+++ b/block-migration.c
@@ -236,7 +236,7 @@ static void init_blk_migration_it(void *opaque, BlockDriverState *bs)
     BlkMigDevState *bmds;
     int64_t sectors;
 
-    if (bs->type == BDRV_TYPE_HD) {
+    if (!bdrv_is_read_only(bs)) {
         sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
         if (sectors == 0) {
             return;