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qmp: Allow to take external snapshots on bs graphs node.

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Signed-off-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Benoît Canet 2014-01-23 21:31:38 +01:00 committed by Kevin Wolf
parent 3b1dbd11a6
commit 0901f67ecd
4 changed files with 71 additions and 12 deletions
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55
blockdev.c
View File

@ -947,14 +947,22 @@ static void blockdev_do_action(int kind, void *data, Error **errp)
qmp_transaction(&list, errp);
}
void qmp_blockdev_snapshot_sync(const char *device, const char *snapshot_file,
void qmp_blockdev_snapshot_sync(bool has_device, const char *device,
bool has_node_name, const char *node_name,
const char *snapshot_file,
bool has_snapshot_node_name,
const char *snapshot_node_name,
bool has_format, const char *format,
bool has_mode, enum NewImageMode mode,
Error **errp)
bool has_mode, NewImageMode mode, Error **errp)
{
BlockdevSnapshot snapshot = {
.has_device = has_device,
.device = (char *) device,
.has_node_name = has_node_name,
.node_name = (char *) node_name,
.snapshot_file = (char *) snapshot_file,
.has_snapshot_node_name = has_snapshot_node_name,
.snapshot_node_name = (char *) snapshot_node_name,
.has_format = has_format,
.format = (char *) format,
.has_mode = has_mode,
@ -1192,8 +1200,14 @@ static void external_snapshot_prepare(BlkTransactionState *common,
{
BlockDriver *drv;
int flags, ret;
QDict *options = NULL;
Error *local_err = NULL;
bool has_device = false;
const char *device;
bool has_node_name = false;
const char *node_name;
bool has_snapshot_node_name = false;
const char *snapshot_node_name;
const char *new_image_file;
const char *format = "qcow2";
enum NewImageMode mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
@ -1204,7 +1218,14 @@ static void external_snapshot_prepare(BlkTransactionState *common,
/* get parameters */
g_assert(action->kind == TRANSACTION_ACTION_KIND_BLOCKDEV_SNAPSHOT_SYNC);
has_device = action->blockdev_snapshot_sync->has_device;
device = action->blockdev_snapshot_sync->device;
has_node_name = action->blockdev_snapshot_sync->has_node_name;
node_name = action->blockdev_snapshot_sync->node_name;
has_snapshot_node_name =
action->blockdev_snapshot_sync->has_snapshot_node_name;
snapshot_node_name = action->blockdev_snapshot_sync->snapshot_node_name;
new_image_file = action->blockdev_snapshot_sync->snapshot_file;
if (action->blockdev_snapshot_sync->has_format) {
format = action->blockdev_snapshot_sync->format;
@ -1220,9 +1241,21 @@ static void external_snapshot_prepare(BlkTransactionState *common,
return;
}
state->old_bs = bdrv_find(device);
if (!state->old_bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
state->old_bs = bdrv_lookup_bs(has_device ? device : NULL,
has_node_name ? node_name : NULL,
&local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return;
}
if (has_node_name && !has_snapshot_node_name) {
error_setg(errp, "New snapshot node name missing");
return;
}
if (has_snapshot_node_name && bdrv_find_node(snapshot_node_name)) {
error_setg(errp, "New snapshot node name already existing");
return;
}
@ -1262,15 +1295,23 @@ static void external_snapshot_prepare(BlkTransactionState *common,
}
}
if (has_snapshot_node_name) {
options = qdict_new();
qdict_put(options, "node-name",
qstring_from_str(snapshot_node_name));
}
/* We will manually add the backing_hd field to the bs later */
state->new_bs = bdrv_new("");
/* TODO Inherit bs->options or only take explicit options with an
* extended QMP command? */
ret = bdrv_open(state->new_bs, new_image_file, NULL,
ret = bdrv_open(state->new_bs, new_image_file, options,
flags | BDRV_O_NO_BACKING, drv, &local_err);
if (ret != 0) {
error_propagate(errp, local_err);
}
QDECREF(options);
}
static void external_snapshot_commit(BlkTransactionState *common)

4
hmp.c
View File

@ -972,7 +972,9 @@ void hmp_snapshot_blkdev(Monitor *mon, const QDict *qdict)
}
mode = reuse ? NEW_IMAGE_MODE_EXISTING : NEW_IMAGE_MODE_ABSOLUTE_PATHS;
qmp_blockdev_snapshot_sync(device, filename, !!format, format,
qmp_blockdev_snapshot_sync(true, device, false, NULL,
filename, false, NULL,
!!format, format,
true, mode, &errp);
hmp_handle_error(mon, &errp);
}

13
qapi-schema.json
View File

@ -1761,18 +1761,25 @@
##
# @BlockdevSnapshot
#
# @device: the name of the device to generate the snapshot from.
# Either @device or @node-name must be set but not both.
#
# @device: #optional the name of the device to generate the snapshot from.
#
# @node-name: #optional graph node name to generate the snapshot from (Since 2.0)
#
# @snapshot-file: the target of the new image. A new file will be created.
#
# @snapshot-node-name: #optional the graph node name of the new image (Since 2.0)
#
# @format: #optional the format of the snapshot image, default is 'qcow2'.
#
# @mode: #optional whether and how QEMU should create a new image, default is
# 'absolute-paths'.
##
{ 'type': 'BlockdevSnapshot',
'data': { 'device': 'str', 'snapshot-file': 'str', '*format': 'str',
'*mode': 'NewImageMode' } }
'data': { '*device': 'str', '*node-name': 'str',
'snapshot-file': 'str', '*snapshot-node-name': 'str',
'*format': 'str', '*mode': 'NewImageMode' } }
##
# @BlockdevSnapshotInternal

11
qmp-commands.hx
View File

@ -1089,7 +1089,9 @@ actions array:
- "data": a dictionary. The contents depend on the value
of "type". When "type" is "blockdev-snapshot-sync":
- "device": device name to snapshot (json-string)
- "node-name": graph node name to snapshot (json-string)
- "snapshot-file": name of new image file (json-string)
- "snapshot-node-name": graph node name of the new snapshot (json-string)
- "format": format of new image (json-string, optional)
- "mode": whether and how QEMU should create the snapshot file
(NewImageMode, optional, default "absolute-paths")
@ -1104,6 +1106,11 @@ Example:
{ 'type': 'blockdev-snapshot-sync', 'data' : { "device": "ide-hd0",
"snapshot-file": "/some/place/my-image",
"format": "qcow2" } },
{ 'type': 'blockdev-snapshot-sync', 'data' : { "node-name": "myfile",
"snapshot-file": "/some/place/my-image2",
"snapshot-node-name": "node3432",
"mode": "existing",
"format": "qcow2" } },
{ 'type': 'blockdev-snapshot-sync', 'data' : { "device": "ide-hd1",
"snapshot-file": "/some/place/my-image2",
"mode": "existing",
@ -1117,7 +1124,7 @@ EQMP
{
.name = "blockdev-snapshot-sync",
.args_type = "device:B,snapshot-file:s,format:s?,mode:s?",
.args_type = "device:s?,node-name:s?,snapshot-file:s,snapshot-node-name:s?,format:s?,mode:s?",
.mhandler.cmd_new = qmp_marshal_input_blockdev_snapshot_sync,
},
@ -1134,7 +1141,9 @@ snapshot image, default is qcow2.
Arguments:
- "device": device name to snapshot (json-string)
- "node-name": graph node name to snapshot (json-string)
- "snapshot-file": name of new image file (json-string)
- "snapshot-node-name": graph node name of the new snapshot (json-string)
- "mode": whether and how QEMU should create the snapshot file
(NewImageMode, optional, default "absolute-paths")
- "format": format of new image (json-string, optional)