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| author | Max Reitz <mreitz@redhat.com> | 2015-10-19 17:53:09 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-10-23 18:18:22 +0200 |
| commit | be4b67bc7d99da26b7878f7f45370f50a3bd4af5 (patch) | |
| tree | d2dae9c69aa9b73dd25a2aae2574cc00125610c3 /qapi | |
| parent | d44f928a54497188c25357840a3224925d1b527b (diff) | |
| download | qemu-be4b67bc7d99da26b7878f7f45370f50a3bd4af5.zip | |
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>
Diffstat (limited to 'qapi')
| -rw-r--r-- | qapi/block-core.json | 13 |
1 files changed, 9 insertions, 4 deletions
diff --git a/qapi/block-core.json b/qapi/block-core.json index c04256185b..425fdab706 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -1393,9 +1393,12 @@ # # @driver: block driver name # @id: #optional id by which the new block device can be referred to. -# This is a required option on the top level of blockdev-add, and -# currently not allowed on any other level. -# @node-name: #optional the name of a block driver state node (Since 2.0) +# This option is only allowed on the top level of blockdev-add. +# A BlockBackend will be created by blockdev-add if and only if +# this option is given. +# @node-name: #optional the name of a block driver state node (Since 2.0). +# This option is required on the top level of blockdev-add if +# the @id option is not given there. # @discard: #optional discard-related options (default: ignore) # @cache: #optional cache-related options # @aio: #optional AIO backend (default: threads) @@ -1859,7 +1862,9 @@ ## # @blockdev-add: # -# Creates a new block device. +# Creates a new block device. If the @id option is given at the top level, a +# BlockBackend will be created; otherwise, @node-name is mandatory at the top +# level and no BlockBackend will be created. # # This command is still a work in progress. It doesn't support all # block drivers, it lacks a matching blockdev-del, and more. Stay |