int ploop_discard(struct ploop_disk_images_data *di,
struct ploop_discard_param *param)
{
int ret;
char dev[PATH_MAX];
char mnt[PATH_MAX];
int mounted = 0;
if (ploop_lock_dd(di))
return SYSEXIT_LOCK;
ret = ploop_find_dev(di->runtime->component_name,
di->images[0]->file, dev, sizeof(dev));
if (ret == -1) {
ploop_unlock_dd(di);
return SYSEXIT_LOCK;
} else if (ret == 0) {
if (ploop_get_mnt_by_dev(dev, mnt, sizeof(mnt))) {
ploop_err(0, "Unable to find mount point for %s", dev);
ploop_unlock_dd(di);
return SYSEXIT_PARAM;
}
} else {
struct ploop_mount_param mount_param = {};
if (!param->automount) {
ploop_err(0, "Unable to discard: image is not mounted");
ploop_unlock_dd(di);
return SYSEXIT_PARAM;
}
ret = auto_mount_image(di, &mount_param);
if (ret) {
ploop_unlock_dd(di);
return ret;
}
mounted = 1;
snprintf(dev, sizeof(dev), "%s", mount_param.device);
snprintf(mnt, sizeof(mnt), "%s", mount_param.target);
free_mount_param(&mount_param);
}
ploop_unlock_dd(di);
ret = do_ploop_discard(di, dev, mnt, param->minlen_b,
param->to_free, param->stop);
if (mounted && ploop_lock_dd(di) == 0) {
ploop_umount(dev, di);
ploop_unlock_dd(di);
}
return ret;
}
int ploop_create_temporary_snapshot(struct ploop_disk_images_data *di,
struct ploop_tsnapshot_param *param, int *holder_fd)
{
int ret;
struct ploop_mount_param mount_param = { .ro = 1, };
char component_name[PLOOP_COOKIE_SIZE];
if (di == NULL || param == NULL)
return SYSEXIT_PARAM;
if (param->guid == NULL) {
ploop_err(0, "Snapshot guid is not specified");
return SYSEXIT_PARAM;
}
if (param->component_name == NULL) {
ploop_err(0, "Component name is not specified");
return SYSEXIT_PARAM;
}
if (ploop_lock_dd(di))
return SYSEXIT_LOCK;
ret = do_create_snapshot(di, param->guid, param->snap_dir, 1);
if (ret)
goto err_unlock;
/* FIXME: should be processed from 'struct ploop_mount_param' only ?? */
char *t = di->runtime->component_name;
snprintf(component_name, sizeof(component_name), "%s%s",
holder_fd == NULL ? TSNAPSHOT_MOUNT_LOCK_MARK : "",
param->component_name);
di->runtime->component_name = component_name;
mount_param.guid = param->guid;
mount_param.target = param->target;
ret = mount_image(di, &mount_param);
di->runtime->component_name = t;
if (ret)
goto err_merge;
strncpy(param->device, mount_param.device, sizeof(param->device));
param->device[sizeof(param->device) - 1] = '\0';
if (holder_fd != NULL) {
ret = open_snap_holder(param->device, holder_fd);
if (ret)
goto err;
}
ploop_unlock_dd(di);
return 0;
err:
ploop_umount(mount_param.device, di);
err_merge:
ploop_merge_snapshot_by_guid(di, di->top_guid, NULL);
err_unlock:
ploop_unlock_dd(di);
return ret;
}
int is_device_inuse(const char *dev)
{
int count;
char fname[PATH_MAX];
char cookie[PLOOP_COOKIE_SIZE] = "";
if (ploop_get_attr(dev, "open_count", &count))
return 1;
/* detect if snapshot locked by ploop mount */
snprintf(fname, sizeof(fname), "/sys/block/%s/pstate/cookie",
memcmp(dev, "/dev/", 5) == 0 ? dev + 5 : dev);
if (read_line_quiet(fname, cookie, sizeof(cookie)))
return 1;
if (!strncmp(cookie, TSNAPSHOT_MOUNT_LOCK_MARK,
sizeof(TSNAPSHOT_MOUNT_LOCK_MARK)-1))
return 1;
/* snap holder + mount */
if (count >= 2)
return 1;
/* if there single reference we should detect is holder is alive */
if (count == 1 && ploop_get_mnt_by_dev(dev, fname, sizeof(fname)) != 0)
return 1;
return 0;
}
static int plooptool_umount(int argc, char **argv)
{
int i, ret;
char *mnt = NULL;
char device[PATH_MAX];
struct {
char * device;
} umountopts = { };
const char *component_name = NULL;
while ((i = getopt(argc, argv, "d:m:c:")) != EOF) {
switch (i) {
case 'd':
umountopts.device = optarg;
break;
case 'm':
mnt = optarg;
break;
case 'c':
component_name = optarg;
break;
default:
usage_umount();
return SYSEXIT_PARAM;
}
}
argc -= optind;
argv += optind;
if (argc != 1 && !umountopts.device && !mnt) {
usage_umount();
return SYSEXIT_PARAM;
}
if (umountopts.device != NULL) {
int len = strlen(umountopts.device);
/* if partition is provided, strip it */
if (strcmp(umountopts.device + len - 2, "p1") == 0 &&
isdigit(umountopts.device[len - 3]))
umountopts.device[len - 2] = '\0';
ret = ploop_umount(umountopts.device, NULL);
}else if (mnt != NULL) {
if (ploop_get_dev_by_mnt(mnt, device, sizeof(device))) {
fprintf(stderr, "Unable to find ploop device by %s\n",
mnt);
return SYSEXIT_PARAM;
}
ret = ploop_umount(device, NULL);
} else if (is_xml_fname(argv[0])) {
struct ploop_disk_images_data *di;
ret = ploop_open_dd(&di, argv[0]);
if (ret)
return ret;
if (component_name != NULL)
ploop_set_component_name(di, component_name);
ret = ploop_umount_image(di);
ploop_close_dd(di);
} else {
if (ploop_find_dev(component_name, argv[0], device, sizeof(device)) != 0) {
fprintf(stderr, "Image %s is not mounted\n", argv[0]);
return SYSEXIT_PARAM;
}
ret = ploop_umount(device, NULL);
}
return ret;
}