@@ -514,6 +514,7 @@ static void floppy_drive_realize(DeviceState *qdev, Error **errp)
FloppyDrive *dev = FLOPPY_DRIVE(qdev);
FloppyBus *bus = FLOPPY_BUS(qdev->parent_bus);
FDrive *drive;
+ bool read_only;
int ret;
if (dev->unit == -1) {
@@ -542,6 +543,12 @@ static void floppy_drive_realize(DeviceState *qdev, Error **errp)
dev->conf.blk = blk_new(qemu_get_aio_context(), 0, BLK_PERM_ALL);
ret = blk_attach_dev(dev->conf.blk, qdev);
assert(ret == 0);
+
+ /* Don't take write permissions on an empty drive to allow attaching a
+ * read-only node later */
+ read_only = true;
+ } else {
+ read_only = !blk_bs(dev->conf.blk) || blk_is_read_only(dev->conf.blk);
}
blkconf_blocksizes(&dev->conf);
@@ -559,9 +566,7 @@ static void floppy_drive_realize(DeviceState *qdev, Error **errp)
dev->conf.rerror = BLOCKDEV_ON_ERROR_AUTO;
dev->conf.werror = BLOCKDEV_ON_ERROR_AUTO;
- if (!blkconf_apply_backend_options(&dev->conf,
- blk_is_read_only(dev->conf.blk),
- false, errp)) {
+ if (!blkconf_apply_backend_options(&dev->conf, read_only, false, errp)) {
return;
}