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block: Accept node-name for block-commit 

In order to remove the necessity to use BlockBackend names in the
external API, we want to allow node-names everywhere. This converts
block-commit to accept a node-name without lifting the restriction that
we're operating at a root node.

As libvirt makes use of the DeviceNotFound error class, we must add
explicit code to retain this behaviour because qmp_get_root_bs() only
returns GenericErrors.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
This commit is contained in:
Kevin Wolf 2016-06-23 14:20:24 +02:00
parent b6c1bae5df
commit 1d13b167fd
3 changed files with 13 additions and 14 deletions
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23
blockdev.c
View File

@ -3068,7 +3068,6 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
bool has_speed, int64_t speed,
Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
BlockDriverState *base_bs, *top_bs;
AioContext *aio_context;
@ -3087,22 +3086,22 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
* live commit feature versions; for this to work, we must make sure to
* perform the device lookup before any generic errors that may occur in a
* scenario in which all optional arguments are omitted. */
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
bs = qmp_get_root_bs(device, &local_err);
if (!bs) {
bs = bdrv_lookup_bs(device, device, NULL);
if (!bs) {
error_free(local_err);
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
"Device '%s' not found", device);
} else {
error_propagate(errp, local_err);
}
return;
}
aio_context = blk_get_aio_context(blk);
aio_context = bdrv_get_aio_context(bs);
aio_context_acquire(aio_context);
if (!blk_is_available(blk)) {
error_setg(errp, "Device '%s' has no medium", device);
goto out;
}
bs = blk_bs(blk);
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_COMMIT_SOURCE, errp)) {
goto out;
}

2
qapi/block-core.json
View File

@ -1020,7 +1020,7 @@
# @job-id: #optional identifier for the newly-created block job. If
# omitted, the device name will be used. (Since 2.7)
#
# @device: the name of the device
# @device: the device name or node-name of a root node
#
# @base: #optional The file name of the backing image to write data into.
# If not specified, this is the deepest backing image

2
qmp-commands.hx
View File

@ -1166,7 +1166,7 @@ Arguments:
- "job-id": Identifier for the newly-created block job. If omitted,
the device name will be used. (json-string, optional)
- "device": The device's ID, must be unique (json-string)
- "device": The device name or node-name of a root node (json-string)
- "base": The file name of the backing image to write data into.
If not specified, this is the deepest backing image
(json-string, optional)