提交 f7b4a940 编写于 作者: A aliguori

snapshot subcommand for qemu-img (Kevin Wolf)

Add snapshot subcommand to qemu-img which allows to list, create, apply
and delete snapshots on qcow2 images.
Signed-off-by: NKevin Wolf <kwolf@suse.de>
Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@6215 c046a42c-6fe2-441c-8c8c-71466251a162
上级 fa879c64
......@@ -7,6 +7,10 @@
#include <sys/signal.h>
#endif
#ifndef _WIN32
#include <sys/time.h>
#endif
#ifndef glue
#define xglue(x, y) x ## y
#define glue(x, y) xglue(x, y)
......
......@@ -22,6 +22,7 @@
* THE SOFTWARE.
*/
#include "qemu-common.h"
#include "osdep.h"
#include "block_int.h"
#include <assert.h>
......@@ -60,6 +61,7 @@ static void help(void)
" commit [-f fmt] filename\n"
" convert [-c] [-e] [-6] [-f fmt] [-O output_fmt] [-B output_base_image] filename [filename2 [...]] output_filename\n"
" info [-f fmt] filename\n"
" snapshot [-l|-a snapshot|-c snapshot|-d snapshot] filename\n"
"\n"
"Command parameters:\n"
" 'filename' is a disk image filename\n"
......@@ -77,6 +79,13 @@ static void help(void)
" '-c' indicates that target image must be compressed (qcow format only)\n"
" '-e' indicates that the target image must be encrypted (qcow format only)\n"
" '-6' indicates that the target image must use compatibility level 6 (vmdk format only)\n"
"\n"
" Parameters to snapshot subcommand:\n"
" 'snapshot' is the name of the snapshot to create, apply or delete\n"
" '-a' applies a snapshot (revert disk to saved state)\n"
" '-c' creates a snapshot\n"
" '-d' deletes a snapshot\n"
" '-l' lists all snapshots in the given image\n"
);
printf("\nSupported format:");
bdrv_iterate_format(format_print, NULL);
......@@ -732,6 +741,116 @@ static int img_info(int argc, char **argv)
return 0;
}
#define SNAPSHOT_LIST 1
#define SNAPSHOT_CREATE 2
#define SNAPSHOT_APPLY 3
#define SNAPSHOT_DELETE 4
static void img_snapshot(int argc, char **argv)
{
BlockDriverState *bs;
QEMUSnapshotInfo sn;
char *filename, *snapshot_name = NULL;
char c;
int ret;
int action = 0;
qemu_timeval tv;
/* Parse commandline parameters */
for(;;) {
c = getopt(argc, argv, "la:c:d:h");
if (c == -1)
break;
switch(c) {
case 'h':
help();
return;
case 'l':
if (action) {
help();
return;
}
action = SNAPSHOT_LIST;
break;
case 'a':
if (action) {
help();
return;
}
action = SNAPSHOT_APPLY;
snapshot_name = optarg;
break;
case 'c':
if (action) {
help();
return;
}
action = SNAPSHOT_CREATE;
snapshot_name = optarg;
break;
case 'd':
if (action) {
help();
return;
}
action = SNAPSHOT_DELETE;
snapshot_name = optarg;
break;
}
}
if (optind >= argc)
help();
filename = argv[optind++];
/* Open the image */
bs = bdrv_new("");
if (!bs)
error("Not enough memory");
if (bdrv_open2(bs, filename, 0, NULL) < 0) {
error("Could not open '%s'", filename);
}
/* Perform the requested action */
switch(action) {
case SNAPSHOT_LIST:
dump_snapshots(bs);
break;
case SNAPSHOT_CREATE:
memset(&sn, 0, sizeof(sn));
pstrcpy(sn.name, sizeof(sn.name), snapshot_name);
qemu_gettimeofday(&tv);
sn.date_sec = tv.tv_sec;
sn.date_nsec = tv.tv_usec * 1000;
ret = bdrv_snapshot_create(bs, &sn);
if (ret)
error("Could not create snapshot '%s': %d (%s)",
snapshot_name, ret, strerror(-ret));
break;
case SNAPSHOT_APPLY:
ret = bdrv_snapshot_goto(bs, snapshot_name);
if (ret)
error("Could not apply snapshot '%s': %d (%s)",
snapshot_name, ret, strerror(-ret));
break;
case SNAPSHOT_DELETE:
ret = bdrv_snapshot_delete(bs, snapshot_name);
if (ret)
error("Could not delete snapshot '%s': %d (%s)",
snapshot_name, ret, strerror(-ret));
break;
}
/* Cleanup */
bdrv_delete(bs);
}
int main(int argc, char **argv)
{
const char *cmd;
......@@ -749,6 +868,8 @@ int main(int argc, char **argv)
img_convert(argc, argv);
} else if (!strcmp(cmd, "info")) {
img_info(argc, argv);
} else if (!strcmp(cmd, "snapshot")) {
img_snapshot(argc, argv);
} else {
help();
}
......
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