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Introduce do_snapshot_blkdev() and monitor command to handle it.

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The monitor command is:
snapshot_blkdev <device> [snapshot-file] [format]

Default format is qcow2. For now snapshots without a snapshot-file, eg
internal snapshots, are not supported.

Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Jes Sorensen 2010-12-16 13:52:16 +01:00 committed by Kevin Wolf
parent f88e1a4201
commit f88825680a
3 changed files with 82 additions and 0 deletions
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62
blockdev.c
View File

@ -516,6 +516,68 @@ void do_commit(Monitor *mon, const QDict *qdict)
}
}
int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data)
{
const char *device = qdict_get_str(qdict, "device");
const char *filename = qdict_get_try_str(qdict, "snapshot_file");
const char *format = qdict_get_try_str(qdict, "format");
BlockDriverState *bs;
BlockDriver *drv, *proto_drv;
int ret = 0;
int flags;
bs = bdrv_find(device);
if (!bs) {
qerror_report(QERR_DEVICE_NOT_FOUND, device);
ret = -1;
goto out;
}
if (!format) {
format = "qcow2";
}
drv = bdrv_find_format(format);
if (!drv) {
qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
ret = -1;
goto out;
}
proto_drv = bdrv_find_protocol(filename);
if (!proto_drv) {
qerror_report(QERR_INVALID_BLOCK_FORMAT, format);
ret = -1;
goto out;
}
ret = bdrv_img_create(filename, format, bs->filename,
bs->drv->format_name, NULL, -1, bs->open_flags);
if (ret) {
goto out;
}
qemu_aio_flush();
bdrv_flush(bs);
flags = bs->open_flags;
bdrv_close(bs);
ret = bdrv_open(bs, filename, flags, drv);
/*
* If reopening the image file we just created fails, we really
* are in trouble :(
*/
if (ret != 0) {
abort();
}
out:
if (ret) {
ret = -1;
}
return ret;
}
static int eject_device(Monitor *mon, BlockDriverState *bs, int force)
{
if (!force) {

1
blockdev.h
View File

@ -52,5 +52,6 @@ int do_block_set_passwd(Monitor *mon, const QDict *qdict, QObject **ret_data);
int do_change_block(Monitor *mon, const char *device,
const char *filename, const char *fmt);
int do_drive_del(Monitor *mon, const QDict *qdict, QObject **ret_data);
int do_snapshot_blkdev(Monitor *mon, const QDict *qdict, QObject **ret_data);
#endif

19
hmp-commands.hx
View File

@ -799,6 +799,25 @@ STEXI
@item migrate_set_downtime @var{second}
@findex migrate_set_downtime
Set maximum tolerated downtime (in seconds) for migration.
ETEXI
{
.name = "snapshot_blkdev",
.args_type = "device:s,snapshot_file:s?,format:s?",
.params = "device [new-image-file] [format]",
.help = "initiates a live snapshot\n\t\t\t"
"of device. If a new image file is specified, the\n\t\t\t"
"new image file will become the new root image.\n\t\t\t"
"If format is specified, the snapshot file will\n\t\t\t"
"be created in that format. Otherwise the\n\t\t\t"
"snapshot will be internal! (currently unsupported)",
.mhandler.cmd_new = do_snapshot_blkdev,
},
STEXI
@item snapshot_blkdev
@findex snapshot_blkdev
Snapshot device, using snapshot file as target if provided
ETEXI
#if defined(TARGET_I386)