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commit: Add filter-node-name to block-commit

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Management tools need to be able to know about every node in the graph
and need a way to address them. Changing the graph structure was okay
because libvirt doesn't really manage the node level yet, but future
libvirt versions need to deal with both new and old version of qemu.

This new option to blockdev-commit allows the client to set a node-name
for the automatically inserted filter driver, and at the same time
serves as a witness for a future libvirt that this version of qemu does
automatically insert a filter driver.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Kevin Wolf 2017-02-20 18:10:05 +01:00
parent 6cdbceb12c
commit 0db832f42e
7 changed files with 32 additions and 13 deletions
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10
blockdev.c
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@ -3032,6 +3032,7 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
bool has_top, const char *top,
bool has_backing_file, const char *backing_file,
bool has_speed, int64_t speed,
bool has_filter_node_name, const char *filter_node_name,
Error **errp)
{
BlockDriverState *bs;
@ -3047,6 +3048,9 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
if (!has_speed) {
speed = 0;
}
if (!has_filter_node_name) {
filter_node_name = NULL;
}
/* Important Note:
* libvirt relies on the DeviceNotFound error class in order to probe for
@ -3121,8 +3125,8 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
goto out;
}
commit_active_start(has_job_id ? job_id : NULL, bs, base_bs,
BLOCK_JOB_DEFAULT, speed, on_error, NULL, NULL,
&local_err, false);
BLOCK_JOB_DEFAULT, speed, on_error,
filter_node_name, NULL, NULL, &local_err, false);
} else {
BlockDriverState *overlay_bs = bdrv_find_overlay(bs, top_bs);
if (bdrv_op_is_blocked(overlay_bs, BLOCK_OP_TYPE_COMMIT_TARGET, errp)) {
@ -3130,7 +3134,7 @@ void qmp_block_commit(bool has_job_id, const char *job_id, const char *device,
}
commit_start(has_job_id ? job_id : NULL, bs, base_bs, top_bs, speed,
on_error, has_backing_file ? backing_file : NULL,
&local_err);
filter_node_name, &local_err);
}
if (local_err != NULL) {
error_propagate(errp, local_err);