int create_snapshot(const char *device, const char *delta, int syncfs)
{
int ret;
int lfd = -1;
int fd = -1;
off_t bdsize;
struct ploop_ctl_delta req;
__u32 blocksize;
int version;
ret = ploop_complete_running_operation(device);
if (ret)
return ret;
ret = get_image_param_online(device, &bdsize,
&blocksize, &version);
if (ret)
return ret;
lfd = open(device, O_RDONLY);
if (lfd < 0) {
ploop_err(errno, "Can't open device %s", device);
return SYSEXIT_DEVICE;
}
fd = create_snapshot_delta(delta, blocksize, bdsize, version);
if (fd < 0) {
ret = SYSEXIT_OPEN;
goto err;
}
memset(&req, 0, sizeof(req));
req.c.pctl_format = PLOOP_FMT_PLOOP1;
req.c.pctl_flags = syncfs ? PLOOP_FLAG_FS_SYNC : 0;
req.c.pctl_cluster_log = ffs(blocksize) - 1;
req.c.pctl_size = 0;
req.c.pctl_chunks = 1;
req.f.pctl_type = PLOOP_IO_AUTO;
ploop_log(0, "Creating snapshot dev=%s img=%s", device, delta);
ret = create_snapshot_ioctl(lfd, fd, &req);
if (ret)
unlink(delta);
err:
if (lfd >= 0)
close(lfd);
if (fd >= 0)
close(fd);
return ret;
}
int create_snapshot(const char *device, const char *delta, int syncfs,
const __u8 *cbt_u, const char *prev_delta)
{
int ret;
int lfd = -1;
int fd = -1;
off_t bdsize;
struct ploop_ctl_delta req;
__u32 blocksize;
int version;
void *or_data = NULL;
ret = get_image_param_online(device, &bdsize,
&blocksize, &version);
if (ret)
return ret;
lfd = open(device, O_RDONLY|O_CLOEXEC);
if (lfd < 0) {
ploop_err(errno, "Can't open device %s", device);
return SYSEXIT_DEVICE;
}
fd = create_snapshot_delta(delta, blocksize, bdsize, version);
if (fd < 0) {
ret = SYSEXIT_OPEN;
goto err;
}
memset(&req, 0, sizeof(req));
req.c.pctl_format = PLOOP_FMT_PLOOP1;
req.c.pctl_flags = syncfs ? PLOOP_FLAG_FS_SYNC : 0;
req.c.pctl_cluster_log = ffs(blocksize) - 1;
req.c.pctl_size = 0;
req.c.pctl_chunks = 1;
req.f.pctl_type = PLOOP_IO_AUTO;
if (cbt_u != NULL) {
if ((ret = cbt_snapshot_prepare(lfd, cbt_u, &or_data))) {
unlink(delta);
goto err;
}
}
ploop_log(0, "Creating snapshot dev=%s img=%s", device, delta);
ret = create_snapshot_ioctl(lfd, fd, &req);
if (ret) {
unlink(delta);
goto err;
}
if (cbt_u != NULL) {
if ((ret = cbt_snapshot(lfd, cbt_u, prev_delta, or_data))) {
unlink(delta);
goto err;
}
}
err:
free(or_data);
if (lfd >= 0)
close(lfd);
if (fd >= 0)
close(fd);
return ret;
}
