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block: Extract blockdev part of qmp_drive_mirror 

This is the part that will be reused by blockdev-mirror.

Signed-off-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 1450932306-13717-3-git-send-email-famz@redhat.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Fam Zheng 2015-12-24 12:45:03 +08:00 committed by Max Reitz
parent 05e4d14bf3
commit 4193cdd771
1 changed files with 72 additions and 42 deletions
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114
blockdev.c
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@ -3291,29 +3291,23 @@ void qmp_blockdev_backup(const char *device, const char *target,
NULL, errp);
}
void qmp_drive_mirror(const char *device, const char *target,
bool has_format, const char *format,
bool has_node_name, const char *node_name,
bool has_replaces, const char *replaces,
enum MirrorSyncMode sync,
bool has_mode, enum NewImageMode mode,
bool has_speed, int64_t speed,
bool has_granularity, uint32_t granularity,
bool has_buf_size, int64_t buf_size,
bool has_on_source_error, BlockdevOnError on_source_error,
bool has_on_target_error, BlockdevOnError on_target_error,
bool has_unmap, bool unmap,
Error **errp)
/* Parameter check and block job starting for drive mirroring.
* Caller should hold @device and @target's aio context (must be the same).
**/
static void blockdev_mirror_common(BlockDriverState *bs,
BlockDriverState *target,
bool has_replaces, const char *replaces,
enum MirrorSyncMode sync,
bool has_speed, int64_t speed,
bool has_granularity, uint32_t granularity,
bool has_buf_size, int64_t buf_size,
bool has_on_source_error,
BlockdevOnError on_source_error,
bool has_on_target_error,
BlockdevOnError on_target_error,
bool has_unmap, bool unmap,
Error **errp)
{
BlockBackend *blk;
BlockDriverState *bs;
BlockDriverState *source, *target_bs;
AioContext *aio_context;
Error *local_err = NULL;
QDict *options;
int flags;
int64_t size;
int ret;
if (!has_speed) {
speed = 0;
@ -3324,9 +3318,6 @@ void qmp_drive_mirror(const char *device, const char *target,
if (!has_on_target_error) {
on_target_error = BLOCKDEV_ON_ERROR_REPORT;
}
if (!has_mode) {
mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
}
if (!has_granularity) {
granularity = 0;
}
@ -3348,6 +3339,48 @@ void qmp_drive_mirror(const char *device, const char *target,
return;
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
return;
}
if (!bs->backing && sync == MIRROR_SYNC_MODE_TOP) {
sync = MIRROR_SYNC_MODE_FULL;
}
/* pass the node name to replace to mirror start since it's loose coupling
* and will allow to check whether the node still exist at mirror completion
*/
mirror_start(bs, target,
has_replaces ? replaces : NULL,
speed, granularity, buf_size, sync,
on_source_error, on_target_error, unmap,
block_job_cb, bs, errp);
}
void qmp_drive_mirror(const char *device, const char *target,
bool has_format, const char *format,
bool has_node_name, const char *node_name,
bool has_replaces, const char *replaces,
enum MirrorSyncMode sync,
bool has_mode, enum NewImageMode mode,
bool has_speed, int64_t speed,
bool has_granularity, uint32_t granularity,
bool has_buf_size, int64_t buf_size,
bool has_on_source_error, BlockdevOnError on_source_error,
bool has_on_target_error, BlockdevOnError on_target_error,
bool has_unmap, bool unmap,
Error **errp)
{
BlockDriverState *bs;
BlockBackend *blk;
BlockDriverState *source, *target_bs;
AioContext *aio_context;
Error *local_err = NULL;
QDict *options = NULL;
int flags;
int64_t size;
int ret;
blk = blk_by_name(device);
if (!blk) {
error_set(errp, ERROR_CLASS_DEVICE_NOT_FOUND,
@ -3363,15 +3396,14 @@ void qmp_drive_mirror(const char *device, const char *target,
goto out;
}
bs = blk_bs(blk);
if (!has_mode) {
mode = NEW_IMAGE_MODE_ABSOLUTE_PATHS;
}
if (!has_format) {
format = mode == NEW_IMAGE_MODE_EXISTING ? NULL : bs->drv->format_name;
}
if (bdrv_op_is_blocked(bs, BLOCK_OP_TYPE_MIRROR_SOURCE, errp)) {
goto out;
}
flags = bs->open_flags | BDRV_O_RDWR;
source = backing_bs(bs);
if (!source && sync == MIRROR_SYNC_MODE_TOP) {
@ -3466,21 +3498,19 @@ void qmp_drive_mirror(const char *device, const char *target,
bdrv_set_aio_context(target_bs, aio_context);
/* pass the node name to replace to mirror start since it's loose coupling
* and will allow to check whether the node still exist at mirror completion
*/
mirror_start(bs, target_bs,
has_replaces ? replaces : NULL,
speed, granularity, buf_size, sync,
on_source_error, on_target_error,
unmap,
block_job_cb, bs, &local_err);
if (local_err != NULL) {
bdrv_unref(target_bs);
blockdev_mirror_common(bs, target_bs,
has_replaces, replaces, sync,
has_speed, speed,
has_granularity, granularity,
has_buf_size, buf_size,
has_on_source_error, on_source_error,
has_on_target_error, on_target_error,
has_unmap, unmap,
&local_err);
if (local_err) {
error_propagate(errp, local_err);
goto out;
bdrv_unref(target_bs);
}
out:
aio_context_release(aio_context);
}