From 9845ad55c470e47c0074d92611bf9fb2903ab58a Mon Sep 17 00:00:00 2001
From: Kevin Wolf <kwolf@redhat.com>
Date: Mon, 9 Sep 2013 14:27:52 +0200
Subject: [PATCH 01/38] block: package preparation code in qmp_transaction()
RH-Author: Kevin Wolf <kwolf@redhat.com>
Message-id: <1378736903-18489-2-git-send-email-kwolf@redhat.com>
Patchwork-id: 54188
O-Subject: [RHEL-7.0 qemu-kvm PATCH 01/32] block: package preparation code in qmp_transaction()
Bugzilla: 1005818
RH-Acked-by: Fam Zheng <famz@redhat.com>
RH-Acked-by: Max Reitz <mreitz@redhat.com>
RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
From: Wenchao Xia <xiawenc@linux.vnet.ibm.com>
Bugzilla: 1005818
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>
(cherry picked from commit 9b9877ee9f1c27588a286f591852c0b7c0548b6a)
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
---
blockdev.c | 139 ++++++++++++++++++++++++++++++++++---------------------------
1 file changed, 77 insertions(+), 62 deletions(-)
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
---
blockdev.c | 139 +++++++++++++++++++++++++++++++++---------------------------
1 files changed, 77 insertions(+), 62 deletions(-)
diff --git a/blockdev.c b/blockdev.c
index 6500c47..1bff654 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -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;
- 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);
+ 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();
}
- /* 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;
- }
}
--
1.7.1