tree d2dae9c69aa9b73dd25a2aae2574cc00125610c3
parent d44f928a54497188c25357840a3224925d1b527b
author Max Reitz <mreitz@redhat.com> 1445269989 +0200
committer Kevin Wolf <kwolf@redhat.com> 1445617102 +0200

blockdev: Allow creation of BDS trees without BB

If the "id" field is missing from the options given to blockdev-add,
just omit the BlockBackend and create the BlockDriverState tree alone.

However, if "id" is missing, "node-name" must be specified; otherwise,
the BDS tree would no longer be accessible.

Many BDS options which are not parsed by bdrv_open() (like caching)
cannot be specified for these BB-less BDS trees yet. A future patch will
remove this limitation.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>