Il 26/11/2013 05:05, Fam Zheng ha scritto:
> + if (backing_bs && *backing_bs != '\0') {
> + bs->backing_hd = bdrv_find(backing_bs);
> + if (!bs->backing_hd) {
> + error_setg(errp, "Backing device not found: %s", backing_bs);
> + return -ENOENT;
> + }
> + bdrv_ref(bs->backing_hd);
> + assert(!bs->backing_blocker);
> + error_setg(&bs->backing_blocker,
> + "device is used as backing hd of '%s'",
> + bs->device_name);
> + bdrv_op_block_all(bs->backing_hd, bs->backing_blocker);
Why should this blocker only apply to the "named backing file" case, and
not to all backing files?
Paolo
> + pstrcpy(bs->backing_file, sizeof(bs->backing_file),
> + bs->backing_hd->filename);
> + pstrcpy(bs->backing_format, sizeof(bs->backing_format),
> + bs->backing_hd->drv->format_name);
> + }
