mirror: Add filter-node-name to blockdev-mirror
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-mirror 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>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Acked-by: Fam Zheng <famz@redhat.com>
diff --git a/block/mirror.c b/block/mirror.c
index 40e8bcc..f6d988d 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -1088,7 +1088,7 @@
void *opaque, Error **errp,
const BlockJobDriver *driver,
bool is_none_mode, BlockDriverState *base,
- bool auto_complete)
+ bool auto_complete, const char *filter_node_name)
{
MirrorBlockJob *s;
BlockDriverState *mirror_top_bs;
@@ -1114,8 +1114,8 @@
/* In the case of active commit, add dummy driver to provide consistent
* reads on the top, while disabling it in the intermediate nodes, and make
* the backing chain writable. */
- mirror_top_bs = bdrv_new_open_driver(&bdrv_mirror_top, NULL, BDRV_O_RDWR,
- errp);
+ mirror_top_bs = bdrv_new_open_driver(&bdrv_mirror_top, filter_node_name,
+ BDRV_O_RDWR, errp);
if (mirror_top_bs == NULL) {
return;
}
@@ -1225,7 +1225,7 @@
MirrorSyncMode mode, BlockMirrorBackingMode backing_mode,
BlockdevOnError on_source_error,
BlockdevOnError on_target_error,
- bool unmap, Error **errp)
+ bool unmap, const char *filter_node_name, Error **errp)
{
bool is_none_mode;
BlockDriverState *base;
@@ -1239,7 +1239,8 @@
mirror_start_job(job_id, bs, BLOCK_JOB_DEFAULT, target, replaces,
speed, granularity, buf_size, backing_mode,
on_source_error, on_target_error, unmap, NULL, NULL, errp,
- &mirror_job_driver, is_none_mode, base, false);
+ &mirror_job_driver, is_none_mode, base, false,
+ filter_node_name);
}
void commit_active_start(const char *job_id, BlockDriverState *bs,
@@ -1260,7 +1261,8 @@
mirror_start_job(job_id, bs, creation_flags, base, NULL, speed, 0, 0,
MIRROR_LEAVE_BACKING_CHAIN,
on_error, on_error, true, cb, opaque, &local_err,
- &commit_active_job_driver, false, base, auto_complete);
+ &commit_active_job_driver, false, base, auto_complete,
+ NULL);
if (local_err) {
error_propagate(errp, local_err);
goto error_restore_flags;
