static int open_top_delta(const char *device, struct delta *delta, int *lvl)
{
char *image = NULL;
char *fmt = NULL;
if (ploop_get_attr(device, "top", lvl)) {
ploop_err(0, "Can't find top delta");
return(SYSEXIT_SYSFS);
}
if (find_delta_names(device, *lvl, *lvl, &image, &fmt))
return(SYSEXIT_SYSFS);
if (strcmp(fmt, "raw") == 0) {
ploop_err(0, "Ballooning for raw format is not supported");
return(SYSEXIT_PARAM);
}
if (open_delta(delta, image, O_RDONLY|O_DIRECT, OD_ALLOW_DIRTY)) {
ploop_err(errno, "open_delta");
return(SYSEXIT_OPEN);
}
return 0;
}
int ploop_copy_init(struct ploop_disk_images_data *di,
struct ploop_copy_param *param,
struct ploop_copy_handle **h)
{
int ret, err;
int blocksize;
char *image = NULL;
char *format = NULL;
char device[64];
char partdev[64];
struct ploop_copy_handle *_h = NULL;
int is_remote;
char mnt[PATH_MAX] = "";
is_remote = is_fd_socket(param->ofd);
if (is_remote < 0) {
ploop_err(0, "Invalid output fd %d: must be a file, "
"a pipe or a socket", param->ofd);
return SYSEXIT_PARAM;
}
if (param->ofd == STDOUT_FILENO)
ploop_set_verbose_level(PLOOP_LOG_NOSTDOUT);
else if (param->ofd == STDERR_FILENO)
ploop_set_verbose_level(PLOOP_LOG_NOCONSOLE);
if (ploop_lock_dd(di))
return SYSEXIT_LOCK;
if (ploop_find_dev_by_dd(di, device, sizeof(device))) {
ploop_err(0, "Can't find running ploop device");
ret = SYSEXIT_SYS;
goto err;
}
ret = get_image_info(device, &image, &format, &blocksize);
if (ret)
goto err;
_h = alloc_ploop_copy_handle(S2B(blocksize));
if (_h == NULL) {
ploop_err(0, "alloc_ploop_copy_handle");
ret = SYSEXIT_MALLOC;
goto err;
}
_h->raw = strcmp(format, "raw") == 0;
_h->ofd = param->ofd;
_h->is_remote = is_remote;
_h->async = param->async;
_h->devfd = open(device, O_RDONLY|O_CLOEXEC);
if (_h->devfd == -1) {
ploop_err(errno, "Can't open device %s", device);
ret = SYSEXIT_DEVICE;
goto err;
}
ret = get_partition_device_name(device, partdev, sizeof(partdev));
if (ret)
goto err;
_h->partfd = open(partdev, O_RDONLY|O_CLOEXEC);
if (_h->partfd == -1) {
ploop_err(errno, "Can't open device %s", partdev);
ret = SYSEXIT_DEVICE;
goto err;
}
ret = SYSEXIT_OPEN;
err = ploop_get_mnt_by_dev(device, mnt, sizeof(mnt));
if (err == -1)
goto err;
else if (err == 0) {
_h->mntfd = open(mnt, O_RDONLY|O_NONBLOCK|O_DIRECTORY);
if (_h->mntfd < 0) {
ploop_err(errno, "Can't open %s", mnt);
goto err;
}
}
ploop_log(0, "Send image %s dev=%s mnt=%s fmt=%s blocksize=%d local=%d",
image, device, mnt, format, blocksize, !is_remote);
if (open_delta(&_h->idelta, image, O_RDONLY|O_DIRECT, OD_ALLOW_DIRTY)) {
ret = SYSEXIT_OPEN;
goto err;
}
ret = complete_running_operation(di, device);
if (ret)
goto err;
_h->cl = register_cleanup_hook(cancel_sender, _h);
pthread_mutex_lock(&_h->sd.wait_mutex);
err:
if (ret) {
ploop_copy_release(_h);
free_ploop_copy_handle(_h);
} else
*h = _h;
free(image);
ploop_unlock_dd(di);
return ret;
}
