static int ploop_get_dev_and_mnt(struct ploop_disk_images_data *di,
char *dev, int dev_len, char *mnt, int mnt_len)
{
if (ploop_lock_dd(di))
return SYSEXIT_LOCK;
if (ploop_find_dev(di->runtime->component_name,
di->images[0]->file, dev, dev_len))
{
ploop_unlock_dd(di);
return SYSEXIT_PARAM;
}
if (ploop_get_mnt_by_dev(dev, mnt, mnt_len)) {
ploop_err(0, "Unable to find mount point for %s", dev);
ploop_unlock_dd(di);
return SYSEXIT_PARAM;
}
ploop_unlock_dd(di);
return 0;
}
int ploop_create_snapshot(struct ploop_disk_images_data *di,
struct ploop_snapshot_param *param)
{
int ret;
if (ploop_lock_dd(di))
return SYSEXIT_LOCK;
ret = do_create_snapshot(di, param->guid, param->snap_dir, 0);
ploop_unlock_dd(di);
return ret;
}
int ploop_delete_snapshot(struct ploop_disk_images_data *di, const char *guid)
{
int ret;
if (ploop_lock_dd(di))
return SYSEXIT_LOCK;
ret = do_delete_snapshot(di, guid);
if (ret == 0)
merge_temporary_snapshots(di);
ploop_unlock_dd(di);
return ret;
}
int ploop_create_snapshot_offline(struct ploop_disk_images_data *di,
struct ploop_snapshot_param *param)
{
int ret;
if (ploop_lock_dd(di))
return SYSEXIT_LOCK;
ret = do_create_snapshot(di, param->guid, param->snap_dir,
param->cbt_uuid, SNAP_TYPE_OFFLINE);
ploop_unlock_dd(di);
return ret;
}
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_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;
}
int ploop_switch_snapshot_ex(struct ploop_disk_images_data *di,
struct ploop_snapshot_switch_param *param)
{
int ret;
int fd;
char dev[64];
char uuid[UUID_SIZE];
char file_uuid[UUID_SIZE];
char new_top_delta_fname[PATH_MAX] = "";
char *old_top_delta_fname = NULL;
char conf[PATH_MAX];
char conf_tmp[PATH_MAX];
off_t size;
const char *guid = param->guid;
int flags = param->flags;
__u32 blocksize;
int version;
int snap_id;
if (!is_valid_guid(guid)) {
ploop_err(0, "Incorrect guid %s", guid);
return SYSEXIT_PARAM;
}
if (ploop_lock_dd(di))
return SYSEXIT_LOCK;
if (is_old_snapshot_format(di)) {
ret = SYSEXIT_PARAM;
goto err_cleanup1;
}
ret = SYSEXIT_PARAM;
if (strcmp(di->top_guid, guid) == 0) {
ploop_err(errno, "Nothing to do, already on %s snapshot",
guid);
goto err_cleanup1;
}
snap_id = find_snapshot_by_guid(di, guid);
if (snap_id== -1) {
ploop_err(0, "Can't find snapshot by uuid %s",
guid);
goto err_cleanup1;
}
if (di->snapshots[snap_id]->temporary) {
ploop_err(0, "Snapshot %s is temporary", guid);
goto err_cleanup1;
}
if (flags & PLOOP_SNAP_SKIP_TOPDELTA_CREATE) {
ret = reset_top_delta(di, param);
goto err_cleanup1;
}
// Read image param from snapshot we going to switch on
ret = get_image_param(di, guid, &size, &blocksize, &version);
if (ret)
goto err_cleanup1;
ret = gen_uuid_pair(uuid, sizeof(uuid), file_uuid, sizeof(file_uuid));
if (ret) {
ploop_err(errno, "Can't generate uuid");
goto err_cleanup1;
}
if (!(flags & PLOOP_SNAP_SKIP_TOPDELTA_DESTROY)) {
// device should be stopped
ret = ploop_find_dev_by_dd(di, dev, sizeof(dev));
if (ret == -1) {
ret = SYSEXIT_SYS;
goto err_cleanup1;
} else if (ret == 0) {
ret = SYSEXIT_PARAM;
ploop_err(0, "Unable to perform switch to snapshot operation"
" on running device (%s)",
dev);
goto err_cleanup1;
}
ret = ploop_di_remove_image(di, di->top_guid, 0, &old_top_delta_fname);
if (ret)
goto err_cleanup1;
} else if (param->guid_old != NULL) {
if (!is_valid_guid(param->guid_old)) {
ret = SYSEXIT_PARAM;
ploop_err(0, "Incorrect guid %s", param->guid_old);
goto err_cleanup1;
}
if (find_snapshot_by_guid(di, param->guid_old) != -1) {
ret = SYSEXIT_PARAM;
ploop_err(0, "Incorrect guid_old %s: already exists",
param->guid_old);
goto err_cleanup1;
}
ploop_di_change_guid(di, di->top_guid, param->guid_old);
}
snprintf(new_top_delta_fname, sizeof(new_top_delta_fname), "%s.%s",
di->images[0]->file, file_uuid);
ret = ploop_di_add_image(di, new_top_delta_fname, TOPDELTA_UUID, guid);
if (ret)
goto err_cleanup1;
get_disk_descriptor_fname(di, conf, sizeof(conf));
snprintf(conf_tmp, sizeof(conf_tmp), "%s.tmp", conf);
ret = ploop_store_diskdescriptor(conf_tmp, di);
if (ret)
goto err_cleanup1;
// offline snapshot
fd = create_snapshot_delta(new_top_delta_fname, blocksize, size, version);
if (fd == -1) {
ret = SYSEXIT_CREAT;
goto err_cleanup2;
}
close(fd);
if (rename(conf_tmp, conf)) {
ploop_err(errno, "Can't rename %s %s",
conf_tmp, conf);
ret = SYSEXIT_RENAME;
goto err_cleanup3;
}
/* destroy precached info */
drop_statfs_info(di->images[0]->file);
if (old_top_delta_fname != NULL) {
ploop_log(0, "Removing %s", old_top_delta_fname);
if (unlink(old_top_delta_fname) && errno != ENOENT)
ploop_err(errno, "Can't unlink %s",
old_top_delta_fname);
}
ploop_log(0, "ploop snapshot has been successfully switched");
err_cleanup3:
if (ret && unlink(new_top_delta_fname))
ploop_err(errno, "Can't unlink %s",
conf_tmp);
err_cleanup2:
if (ret && unlink(conf_tmp))
ploop_err(errno, "Can't unlink %s",
conf_tmp);
err_cleanup1:
ploop_unlock_dd(di);
free(old_top_delta_fname);
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;
}