motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2026-03-04 09:04:39 -07:00
Code Issues Projects Releases Packages Wiki Activity Actions

qmp: add drive-mirror command

Browse source 
This adds the monitor commands that start the mirroring job.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-10-18 16:49:24 +02:00 • committed by Kevin Wolf
parent 893f7ebafe
commit d9b902db3f
6 changed files with 250 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

124
blockdev.c
View file

@ -1181,6 +1181,130 @@ void qmp_block_commit(const char *device,
drive_get_ref(drive_get_by_blockdev(bs));
}
void qmp_drive_mirror(const char *device, const char *target,
bool has_format, const char *format,
enum MirrorSyncMode sync,
bool has_mode, enum NewImageMode mode,
bool has_speed, int64_t speed, Error **errp)
{
BlockDriverInfo bdi;
BlockDriverState *bs;
BlockDriverState *source, *target_bs;
BlockDriver *proto_drv;
BlockDriver *drv = NULL;
Error *local_err = NULL;
int flags;
uint64_t size;
int ret;
if (!has_speed) {
speed = 0;
}
if (!has_mode) {
mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
}
bs = bdrv_find(device);
if (!bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
if (!bdrv_is_inserted(bs)) {
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
return;
}
if (!has_format) {
format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
}
if (format) {
drv = bdrv_find_format(format);
if (!drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
return;
}
}
if (bdrv_in_use(bs)) {
error_set(errp, QERR_DEVICE_IN_USE, device);
return;
}
flags = bs->open_flags | BDRV_O_RDWR;
source = bs->backing_hd;
if (!source && sync == MIRROR_SYNC_MODE_TOP) {
sync = MIRROR_SYNC_MODE_FULL;
}
proto_drv = bdrv_find_protocol(target);
if (!proto_drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
return;
}
if (sync == MIRROR_SYNC_MODE_FULL && mode != NEW_IMAGE_MODE_EXISTING) {
/* create new image w/o backing file */
assert(format && drv);
bdrv_get_geometry(bs, &size);
size *= 512;
ret = bdrv_img_create(target, format,
NULL, NULL, NULL, size, flags);
} else {
switch (mode) {
case NEW_IMAGE_MODE_EXISTING:
ret = 0;
break;
case NEW_IMAGE_MODE_ABSOLUTE_PATHS:
/* create new image with backing file */
ret = bdrv_img_create(target, format,
source->filename,
source->drv->format_name,
NULL, -1, flags);
break;
default:
abort();
}
}
if (ret) {
error_set(errp, QERR_OPEN_FILE_FAILED, target);
return;
}
target_bs = bdrv_new("");
ret = bdrv_open(target_bs, target, flags | BDRV_O_NO_BACKING, drv);
if (ret < 0) {
bdrv_delete(target_bs);
error_set(errp, QERR_OPEN_FILE_FAILED, target);
return;
}
/* We need a backing file if we will copy parts of a cluster. */
if (bdrv_get_info(target_bs, &bdi) >= 0 && bdi.cluster_size != 0 &&
bdi.cluster_size >= BDRV_SECTORS_PER_DIRTY_CHUNK * 512) {
ret = bdrv_open_backing_file(target_bs);
if (ret < 0) {
bdrv_delete(target_bs);
error_set(errp, QERR_OPEN_FILE_FAILED, target);
return;
}
}
mirror_start(bs, target_bs, speed, sync, block_job_cb, bs, &local_err);
if (local_err != NULL) {
bdrv_delete(target_bs);
error_propagate(errp, local_err);
return;
}
/* Grab a reference so hotplug does not delete the BlockDriverState from
* underneath us.
*/
drive_get_ref(drive_get_by_blockdev(bs));
}
static BlockJob *find_block_job(const char *device)
{
BlockDriverState *bs;