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block: package preparation code in qmp_transaction() 

The code before really committing is moved into a function. Most
code is simply moved from qmp_transaction(), except that on fail it
just returns now. Other code such as input parsing is not touched,
to make it easier in review.

Signed-off-by: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Wenchao Xia 2013-05-08 18:25:12 +08:00 committed by Stefan Hajnoczi
parent 64afc2b4d4
commit 9b9877ee9f
1 changed files with 78 additions and 63 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

141
blockdev.c
View File

@ -785,6 +785,78 @@ typedef struct BlkTransactionStates {
QSIMPLEQ_ENTRY(BlkTransactionStates) entry;
} BlkTransactionStates;
static void external_snapshot_prepare(const char *device,
const char *format,
const char *new_image_file,
enum NewImageMode mode,
BlkTransactionStates *states,
Error **errp)
{
BlockDriver *proto_drv;
BlockDriver *drv;
int flags, ret;
Error *local_err = NULL;
drv = bdrv_find_format(format);
if (!drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
return;
}
states->old_bs = bdrv_find(device);
if (!states->old_bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
return;
}
if (!bdrv_is_inserted(states->old_bs)) {
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
return;
}
if (bdrv_in_use(states->old_bs)) {
error_set(errp, QERR_DEVICE_IN_USE, device);
return;
}
if (!bdrv_is_read_only(states->old_bs)) {
if (bdrv_flush(states->old_bs)) {
error_set(errp, QERR_IO_ERROR);
return;
}
}
flags = states->old_bs->open_flags;
proto_drv = bdrv_find_protocol(new_image_file);
if (!proto_drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
return;
}
/* create new image w/backing file */
if (mode != NEW_IMAGE_MODE_EXISTING) {
bdrv_img_create(new_image_file, format,
states->old_bs->filename,
states->old_bs->drv->format_name,
NULL, -1, flags, &local_err, false);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
return;
}
}
/* We will manually add the backing_hd field to the bs later */
states->new_bs = bdrv_new("");
/* TODO Inherit bs->options or only take explicit options with an
* extended QMP command? */
ret = bdrv_open(states->new_bs, new_image_file, NULL,
flags | BDRV_O_NO_BACKING, drv);
if (ret != 0) {
error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
}
}
/*
* 'Atomic' group snapshots. The snapshots are taken as a set, and if any fail
* then we do not pivot any of the devices in the group, and abandon the
@ -792,7 +864,6 @@ typedef struct BlkTransactionStates {
*/
void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
{
int ret = 0;
BlockdevActionList *dev_entry = dev_list;
BlkTransactionStates *states, *next;
Error *local_err = NULL;
@ -806,9 +877,6 @@ void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
/* We don't do anything in this loop that commits us to the snapshot */
while (NULL != dev_entry) {
BlockdevAction *dev_info = NULL;
BlockDriver *proto_drv;
BlockDriver *drv;
int flags;
enum NewImageMode mode;
const char *new_image_file;
const char *device;
@ -831,70 +899,17 @@ void qmp_transaction(BlockdevActionList *dev_list, Error **errp)
format = dev_info->blockdev_snapshot_sync->format;
}
mode = dev_info->blockdev_snapshot_sync->mode;
external_snapshot_prepare(device, format, new_image_file,
mode, states, &local_err);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
goto delete_and_fail;
}
break;
default:
abort();
}
drv = bdrv_find_format(format);
if (!drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
goto delete_and_fail;
}
states->old_bs = bdrv_find(device);
if (!states->old_bs) {
error_set(errp, QERR_DEVICE_NOT_FOUND, device);
goto delete_and_fail;
}
if (!bdrv_is_inserted(states->old_bs)) {
error_set(errp, QERR_DEVICE_HAS_NO_MEDIUM, device);
goto delete_and_fail;
}
if (bdrv_in_use(states->old_bs)) {
error_set(errp, QERR_DEVICE_IN_USE, device);
goto delete_and_fail;
}
if (!bdrv_is_read_only(states->old_bs)) {
if (bdrv_flush(states->old_bs)) {
error_set(errp, QERR_IO_ERROR);
goto delete_and_fail;
}
}
flags = states->old_bs->open_flags;
proto_drv = bdrv_find_protocol(new_image_file);
if (!proto_drv) {
error_set(errp, QERR_INVALID_BLOCK_FORMAT, format);
goto delete_and_fail;
}
/* create new image w/backing file */
if (mode != NEW_IMAGE_MODE_EXISTING) {
bdrv_img_create(new_image_file, format,
states->old_bs->filename,
states->old_bs->drv->format_name,
NULL, -1, flags, &local_err, false);
if (error_is_set(&local_err)) {
error_propagate(errp, local_err);
goto delete_and_fail;
}
}
/* We will manually add the backing_hd field to the bs later */
states->new_bs = bdrv_new("");
/* TODO Inherit bs->options or only take explicit options with an
* extended QMP command? */
ret = bdrv_open(states->new_bs, new_image_file, NULL,
flags | BDRV_O_NO_BACKING, drv);
if (ret != 0) {
error_set(errp, QERR_OPEN_FILE_FAILED, new_image_file);
goto delete_and_fail;
}
}