text: /*-
   *   BSD LICENSE
   *
   *   Copyright (c) Intel Corporation.
   *   All rights reserved.
   *
   *   Redistribution and use in source and binary forms, with or without
   *   modification, are permitted provided that the following conditions
   *   are met:
   *
   *     * Redistributions of source code must retain the above copyright
   *       notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above copyright
   *       notice, this list of conditions and the following disclaimer in
   *       the documentation and/or other materials provided with the
   *       distribution.
   *     * Neither the name of Intel Corporation nor the names of its
   *       contributors may be used to endorse or promote products derived
   *       from this software without specific prior written permission.
   *
   *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   *   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   *   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   *   A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   *   OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   *   SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   *   LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   *   DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   *   THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  #include "spdk_internal/lvolstore.h"
  #include "spdk_internal/log.h"
  #include "spdk/string.h"
  #include "spdk/thread.h"
  #include "spdk/blob_bdev.h"
  #include "spdk/util.h"
  
  /* Default blob channel opts for lvol */
  #define SPDK_LVOL_BLOB_OPTS_CHANNEL_OPS 512
  
  #define LVOL_NAME "name"
  
  SPDK_LOG_REGISTER_COMPONENT("lvol", SPDK_LOG_LVOL)
  
  static TAILQ_HEAD(, spdk_lvol_store) g_lvol_stores = TAILQ_HEAD_INITIALIZER(g_lvol_stores);
  static pthread_mutex_t g_lvol_stores_mutex = PTHREAD_MUTEX_INITIALIZER;
  
  static inline uint64_t
  divide_round_up(uint64_t num, uint64_t divisor)
  {
  	return (num + divisor - 1) / divisor;
  }
  
  static int
  _spdk_add_lvs_to_list(struct spdk_lvol_store *lvs)
  {
  	struct spdk_lvol_store *tmp;
  	bool name_conflict = false;
  
  	pthread_mutex_lock(&g_lvol_stores_mutex);
  	TAILQ_FOREACH(tmp, &g_lvol_stores, link) {
  		if (!strncmp(lvs->name, tmp->name, SPDK_LVS_NAME_MAX)) {
  			name_conflict = true;
  			break;
  		}
  	}
  	if (!name_conflict) {
  		lvs->on_list = true;
  		TAILQ_INSERT_TAIL(&g_lvol_stores, lvs, link);
  	}
  	pthread_mutex_unlock(&g_lvol_stores_mutex);
  
  	return name_conflict ? -1 : 0;
  }
  
  static void
  _spdk_lvs_free(struct spdk_lvol_store *lvs)
  {
  	if (lvs->on_list) {
  		TAILQ_REMOVE(&g_lvol_stores, lvs, link);
  	}
  	free(lvs);
  }
  
  static void
  _spdk_lvol_free(struct spdk_lvol *lvol)
  {
  	free(lvol->unique_id);
  	free(lvol);
  }
  
  static void
  _spdk_lvol_open_cb(void *cb_arg, struct spdk_blob *blob, int lvolerrno)
  {
  	struct spdk_lvol_with_handle_req *req = cb_arg;
  	struct spdk_lvol *lvol = req->lvol;
  
  	if (lvolerrno != 0) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "Failed to open lvol %s\n", lvol->unique_id);
  		goto end;
  	}
  
  	lvol->ref_count++;
  	lvol->blob = blob;
  end:
  	req->cb_fn(req->cb_arg, lvol, lvolerrno);
  	free(req);
  }
  
  void
  spdk_lvol_open(struct spdk_lvol *lvol, spdk_lvol_op_with_handle_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvol_with_handle_req *req;
  
  	assert(cb_fn != NULL);
  
  	if (lvol == NULL) {
  		SPDK_ERRLOG("lvol does not exist\n");
  		cb_fn(cb_arg, NULL, -ENODEV);
  		return;
  	}
  
  	if (lvol->action_in_progress == true) {
  		SPDK_ERRLOG("Cannot open lvol - operations on lvol pending\n");
  		cb_fn(cb_arg, lvol, -EBUSY);
  		return;
  	}
  
  	if (lvol->ref_count > 0) {
  		lvol->ref_count++;
  		cb_fn(cb_arg, lvol, 0);
  		return;
  	}
  
  	req = calloc(1, sizeof(*req));
  	if (req == NULL) {
  		SPDK_ERRLOG("Cannot alloc memory for request structure\n");
  		cb_fn(cb_arg, NULL, -ENOMEM);
  		return;
  	}
  
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  	req->lvol = lvol;
  
  	spdk_bs_open_blob(lvol->lvol_store->blobstore, lvol->blob_id, _spdk_lvol_open_cb, req);
  }
  
  static void
  _spdk_bs_unload_with_error_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = (struct spdk_lvs_with_handle_req *)cb_arg;
  
  	req->cb_fn(req->cb_arg, NULL, req->lvserrno);
  	free(req);
  }
  
  static void
  _spdk_load_next_lvol(void *cb_arg, struct spdk_blob *blob, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = cb_arg;
  	struct spdk_lvol_store *lvs = req->lvol_store;
  	struct spdk_blob_store *bs = lvs->blobstore;
  	struct spdk_lvol *lvol, *tmp;
  	spdk_blob_id blob_id;
  	char uuid[SPDK_UUID_STRING_LEN];
  	const char *attr;
  	size_t value_len;
  	int rc;
  
  	if (lvolerrno == -ENOENT) {
  		/* Finished iterating */
  		req->cb_fn(req->cb_arg, lvs, 0);
  		free(req);
  		return;
  	} else if (lvolerrno < 0) {
  		SPDK_ERRLOG("Failed to fetch blobs list\n");
  		req->lvserrno = lvolerrno;
  		goto invalid;
  	}
  
  	blob_id = spdk_blob_get_id(blob);
  
  	if (blob_id == lvs->super_blob_id) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "found superblob %"PRIu64"\n", (uint64_t)blob_id);
  		spdk_bs_iter_next(bs, blob, _spdk_load_next_lvol, req);
  		return;
  	}
  
  	lvol = calloc(1, sizeof(*lvol));
  	if (!lvol) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol base pointer\n");
  		req->lvserrno = -ENOMEM;
  		goto invalid;
  	}
  
  	lvol->blob = blob;
  	lvol->blob_id = blob_id;
  	lvol->lvol_store = lvs;
  
  	rc = spdk_blob_get_xattr_value(blob, "uuid", (const void **)&attr, &value_len);
  	if (rc != 0 || value_len != SPDK_UUID_STRING_LEN || attr[SPDK_UUID_STRING_LEN - 1] != '\0' ||
  	    spdk_uuid_parse(&lvol->uuid, attr) != 0) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "Missing or corrupt lvol uuid\n");
  		memset(&lvol->uuid, 0, sizeof(lvol->uuid));
  	}
  	spdk_uuid_fmt_lower(lvol->uuid_str, sizeof(lvol->uuid_str), &lvol->uuid);
  
  	if (!spdk_mem_all_zero(&lvol->uuid, sizeof(lvol->uuid))) {
  		lvol->unique_id = strdup(lvol->uuid_str);
  	} else {
  		spdk_uuid_fmt_lower(uuid, sizeof(uuid), &lvol->lvol_store->uuid);
  		lvol->unique_id = spdk_sprintf_alloc("%s_%"PRIu64, uuid, (uint64_t)blob_id);
  	}
  	if (!lvol->unique_id) {
  		SPDK_ERRLOG("Cannot assign lvol name\n");
  		free(lvol);
  		req->lvserrno = -ENOMEM;
  		goto invalid;
  	}
  
  	rc = spdk_blob_get_xattr_value(blob, "name", (const void **)&attr, &value_len);
  	if (rc != 0 || value_len > SPDK_LVOL_NAME_MAX) {
  		SPDK_ERRLOG("Cannot assign lvol name\n");
  		_spdk_lvol_free(lvol);
  		req->lvserrno = -EINVAL;
  		goto invalid;
  	}
  
  	snprintf(lvol->name, sizeof(lvol->name), "%s", attr);
  
  	TAILQ_INSERT_TAIL(&lvs->lvols, lvol, link);
  
  	lvs->lvol_count++;
  
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "added lvol %s (%s)\n", lvol->unique_id, lvol->uuid_str);
  
  	spdk_bs_iter_next(bs, blob, _spdk_load_next_lvol, req);
  
  	return;
  
  invalid:
  	TAILQ_FOREACH_SAFE(lvol, &lvs->lvols, link, tmp) {
  		TAILQ_REMOVE(&lvs->lvols, lvol, link);
  		free(lvol->unique_id);
  		free(lvol);
  	}
  
  	_spdk_lvs_free(lvs);
  	spdk_bs_unload(bs, _spdk_bs_unload_with_error_cb, req);
  }
  
  static void
  _spdk_close_super_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = (struct spdk_lvs_with_handle_req *)cb_arg;
  	struct spdk_lvol_store *lvs = req->lvol_store;
  	struct spdk_blob_store *bs = lvs->blobstore;
  
  	if (lvolerrno != 0) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "Could not close super blob\n");
  		_spdk_lvs_free(lvs);
  		req->lvserrno = -ENODEV;
  		spdk_bs_unload(bs, _spdk_bs_unload_with_error_cb, req);
  		return;
  	}
  
  	/* Start loading lvols */
  	spdk_bs_iter_first(lvs->blobstore, _spdk_load_next_lvol, req);
  }
  
  static void
  _spdk_close_super_blob_with_error_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = (struct spdk_lvs_with_handle_req *)cb_arg;
  	struct spdk_lvol_store *lvs = req->lvol_store;
  	struct spdk_blob_store *bs = lvs->blobstore;
  
  	_spdk_lvs_free(lvs);
  
  	spdk_bs_unload(bs, _spdk_bs_unload_with_error_cb, req);
  }
  
  static void
  _spdk_lvs_read_uuid(void *cb_arg, struct spdk_blob *blob, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = (struct spdk_lvs_with_handle_req *)cb_arg;
  	struct spdk_lvol_store *lvs = req->lvol_store;
  	struct spdk_blob_store *bs = lvs->blobstore;
  	const char *attr;
  	size_t value_len;
  	int rc;
  
  	if (lvolerrno != 0) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "Could not open super blob\n");
  		_spdk_lvs_free(lvs);
  		req->lvserrno = -ENODEV;
  		spdk_bs_unload(bs, _spdk_bs_unload_with_error_cb, req);
  		return;
  	}
  
  	rc = spdk_blob_get_xattr_value(blob, "uuid", (const void **)&attr, &value_len);
  	if (rc != 0 || value_len != SPDK_UUID_STRING_LEN || attr[SPDK_UUID_STRING_LEN - 1] != '\0') {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "missing or incorrect UUID\n");
  		req->lvserrno = -EINVAL;
  		spdk_blob_close(blob, _spdk_close_super_blob_with_error_cb, req);
  		return;
  	}
  
  	if (spdk_uuid_parse(&lvs->uuid, attr)) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "incorrect UUID '%s'\n", attr);
  		req->lvserrno = -EINVAL;
  		spdk_blob_close(blob, _spdk_close_super_blob_with_error_cb, req);
  		return;
  	}
  
  	rc = spdk_blob_get_xattr_value(blob, "name", (const void **)&attr, &value_len);
  	if (rc != 0 || value_len > SPDK_LVS_NAME_MAX) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "missing or invalid name\n");
  		req->lvserrno = -EINVAL;
  		spdk_blob_close(blob, _spdk_close_super_blob_with_error_cb, req);
  		return;
  	}
  
  	snprintf(lvs->name, sizeof(lvs->name), "%s", attr);
  
  	rc = _spdk_add_lvs_to_list(lvs);
  	if (rc) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "lvolstore with name %s already exists\n", lvs->name);
  		req->lvserrno = -EEXIST;
  		spdk_blob_close(blob, _spdk_close_super_blob_with_error_cb, req);
  		return;
  	}
  
  	lvs->super_blob_id = spdk_blob_get_id(blob);
  
  	spdk_blob_close(blob, _spdk_close_super_cb, req);
  }
  
  static void
  _spdk_lvs_open_super(void *cb_arg, spdk_blob_id blobid, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = (struct spdk_lvs_with_handle_req *)cb_arg;
  	struct spdk_lvol_store *lvs = req->lvol_store;
  	struct spdk_blob_store *bs = lvs->blobstore;
  
  	if (lvolerrno != 0) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "Super blob not found\n");
  		_spdk_lvs_free(lvs);
  		req->lvserrno = -ENODEV;
  		spdk_bs_unload(bs, _spdk_bs_unload_with_error_cb, req);
  		return;
  	}
  
  	spdk_bs_open_blob(bs, blobid, _spdk_lvs_read_uuid, req);
  }
  
  static void
  _spdk_lvs_load_cb(void *cb_arg, struct spdk_blob_store *bs, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = (struct spdk_lvs_with_handle_req *)cb_arg;
  	struct spdk_lvol_store *lvs;
  
  	if (lvolerrno != 0) {
  		req->cb_fn(req->cb_arg, NULL, lvolerrno);
  		free(req);
  		return;
  	}
  
  	lvs = calloc(1, sizeof(*lvs));
  	if (lvs == NULL) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol store\n");
  		spdk_bs_unload(bs, _spdk_bs_unload_with_error_cb, req);
  		return;
  	}
  
  	lvs->blobstore = bs;
  	lvs->bs_dev = req->bs_dev;
  	TAILQ_INIT(&lvs->lvols);
  	TAILQ_INIT(&lvs->pending_lvols);
  
  	req->lvol_store = lvs;
  
  	spdk_bs_get_super(bs, _spdk_lvs_open_super, req);
  }
  
  static void
  spdk_lvs_bs_opts_init(struct spdk_bs_opts *opts)
  {
  	spdk_bs_opts_init(opts);
  	opts->max_channel_ops = SPDK_LVOL_BLOB_OPTS_CHANNEL_OPS;
  }
  
  void
  spdk_lvs_load(struct spdk_bs_dev *bs_dev, spdk_lvs_op_with_handle_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvs_with_handle_req *req;
  	struct spdk_bs_opts opts = {};
  
  	assert(cb_fn != NULL);
  
  	if (bs_dev == NULL) {
  		SPDK_ERRLOG("Blobstore device does not exist\n");
  		cb_fn(cb_arg, NULL, -ENODEV);
  		return;
  	}
  
  	req = calloc(1, sizeof(*req));
  	if (req == NULL) {
  		SPDK_ERRLOG("Cannot alloc memory for request structure\n");
  		cb_fn(cb_arg, NULL, -ENOMEM);
  		return;
  	}
  
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  	req->bs_dev = bs_dev;
  
  	spdk_lvs_bs_opts_init(&opts);
  	snprintf(opts.bstype.bstype, sizeof(opts.bstype.bstype), "LVOLSTORE");
  
  	spdk_bs_load(bs_dev, &opts, _spdk_lvs_load_cb, req);
  }
  
  static void
  _spdk_super_create_close_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = cb_arg;
  	struct spdk_lvol_store *lvs = req->lvol_store;
  
  	if (lvolerrno < 0) {
  		SPDK_ERRLOG("Lvol store init failed: could not close super blob\n");
  		req->cb_fn(req->cb_arg, NULL, lvolerrno);
  		_spdk_lvs_free(lvs);
  		free(req);
  		return;
  	}
  
  	req->cb_fn(req->cb_arg, lvs, lvolerrno);
  	free(req);
  }
  
  static void
  _spdk_super_blob_set_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = cb_arg;
  	struct spdk_lvol_store *lvs = req->lvol_store;
  	struct spdk_blob *blob = lvs->super_blob;
  
  	if (lvolerrno < 0) {
  		req->cb_fn(req->cb_arg, NULL, lvolerrno);
  		SPDK_ERRLOG("Lvol store init failed: could not set uuid for super blob\n");
  		_spdk_lvs_free(lvs);
  		free(req);
  		return;
  	}
  
  	spdk_blob_close(blob, _spdk_super_create_close_cb, req);
  }
  
  static void
  _spdk_super_blob_init_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = cb_arg;
  	struct spdk_lvol_store *lvs = req->lvol_store;
  	struct spdk_blob *blob = lvs->super_blob;
  	char uuid[SPDK_UUID_STRING_LEN];
  
  	if (lvolerrno < 0) {
  		req->cb_fn(req->cb_arg, NULL, lvolerrno);
  		SPDK_ERRLOG("Lvol store init failed: could not set super blob\n");
  		_spdk_lvs_free(lvs);
  		free(req);
  		return;
  	}
  
  	spdk_uuid_fmt_lower(uuid, sizeof(uuid), &lvs->uuid);
  
  	spdk_blob_set_xattr(blob, "uuid", uuid, sizeof(uuid));
  	spdk_blob_set_xattr(blob, "name", lvs->name, strnlen(lvs->name, SPDK_LVS_NAME_MAX) + 1);
  	spdk_blob_sync_md(blob, _spdk_super_blob_set_cb, req);
  }
  
  static void
  _spdk_super_blob_create_open_cb(void *cb_arg, struct spdk_blob *blob, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = cb_arg;
  	struct spdk_lvol_store *lvs = req->lvol_store;
  
  	if (lvolerrno < 0) {
  		req->cb_fn(req->cb_arg, NULL, lvolerrno);
  		SPDK_ERRLOG("Lvol store init failed: could not open super blob\n");
  		_spdk_lvs_free(lvs);
  		free(req);
  		return;
  	}
  
  	lvs->super_blob = blob;
  	lvs->super_blob_id = spdk_blob_get_id(blob);
  
  	spdk_bs_set_super(lvs->blobstore, lvs->super_blob_id, _spdk_super_blob_init_cb, req);
  }
  
  static void
  _spdk_super_blob_create_cb(void *cb_arg, spdk_blob_id blobid, int lvolerrno)
  {
  	struct spdk_lvs_with_handle_req *req = cb_arg;
  	struct spdk_lvol_store *lvs = req->lvol_store;
  	struct spdk_blob_store *bs;
  
  	if (lvolerrno < 0) {
  		req->cb_fn(req->cb_arg, NULL, lvolerrno);
  		SPDK_ERRLOG("Lvol store init failed: could not create super blob\n");
  		_spdk_lvs_free(lvs);
  		free(req);
  		return;
  	}
  
  	bs = req->lvol_store->blobstore;
  
  	spdk_bs_open_blob(bs, blobid, _spdk_super_blob_create_open_cb, req);
  }
  
  static void
  _spdk_lvs_init_cb(void *cb_arg, struct spdk_blob_store *bs, int lvserrno)
  {
  	struct spdk_lvs_with_handle_req *lvs_req = cb_arg;
  	struct spdk_lvol_store *lvs = lvs_req->lvol_store;
  
  	if (lvserrno != 0) {
  		assert(bs == NULL);
  		lvs_req->cb_fn(lvs_req->cb_arg, NULL, lvserrno);
  		SPDK_ERRLOG("Lvol store init failed: could not initialize blobstore\n");
  		_spdk_lvs_free(lvs);
  		free(lvs_req);
  		return;
  	}
  
  	assert(bs != NULL);
  	lvs->blobstore = bs;
  	TAILQ_INIT(&lvs->lvols);
  	TAILQ_INIT(&lvs->pending_lvols);
  
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "Lvol store initialized\n");
  
  	/* create super blob */
  	spdk_bs_create_blob(lvs->blobstore, _spdk_super_blob_create_cb, lvs_req);
  }
  
  void
  spdk_lvs_opts_init(struct spdk_lvs_opts *o)
  {
  	o->cluster_sz = SPDK_LVS_OPTS_CLUSTER_SZ;
  	memset(o->name, 0, sizeof(o->name));
  }
  
  static void
  _spdk_setup_lvs_opts(struct spdk_bs_opts *bs_opts, struct spdk_lvs_opts *o)
  {
  	assert(o != NULL);
  	spdk_lvs_bs_opts_init(bs_opts);
  	bs_opts->cluster_sz = o->cluster_sz;
  }
  
  int
  spdk_lvs_init(struct spdk_bs_dev *bs_dev, struct spdk_lvs_opts *o,
  	      spdk_lvs_op_with_handle_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvol_store *lvs;
  	struct spdk_lvs_with_handle_req *lvs_req;
  	struct spdk_bs_opts opts = {};
  	int rc;
  
  	if (bs_dev == NULL) {
  		SPDK_ERRLOG("Blobstore device does not exist\n");
  		return -ENODEV;
  	}
  
  	if (o == NULL) {
  		SPDK_ERRLOG("spdk_lvs_opts not specified\n");
  		return -EINVAL;
  	}
  
  	_spdk_setup_lvs_opts(&opts, o);
  
  	if (strnlen(o->name, SPDK_LVS_NAME_MAX) == SPDK_LVS_NAME_MAX) {
  		SPDK_ERRLOG("Name has no null terminator.\n");
  		return -EINVAL;
  	}
  
  	if (strnlen(o->name, SPDK_LVS_NAME_MAX) == 0) {
  		SPDK_ERRLOG("No name specified.\n");
  		return -EINVAL;
  	}
  
  	lvs = calloc(1, sizeof(*lvs));
  	if (!lvs) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol store base pointer\n");
  		return -ENOMEM;
  	}
  
  	spdk_uuid_generate(&lvs->uuid);
  	snprintf(lvs->name, sizeof(lvs->name), "%s", o->name);
  
  	rc = _spdk_add_lvs_to_list(lvs);
  	if (rc) {
  		SPDK_ERRLOG("lvolstore with name %s already exists\n", lvs->name);
  		_spdk_lvs_free(lvs);
  		return -EEXIST;
  	}
  
  	lvs_req = calloc(1, sizeof(*lvs_req));
  	if (!lvs_req) {
  		_spdk_lvs_free(lvs);
  		SPDK_ERRLOG("Cannot alloc memory for lvol store request pointer\n");
  		return -ENOMEM;
  	}
  
  	assert(cb_fn != NULL);
  	lvs_req->cb_fn = cb_fn;
  	lvs_req->cb_arg = cb_arg;
  	lvs_req->lvol_store = lvs;
  	lvs->bs_dev = bs_dev;
  	lvs->destruct = false;
  
  	snprintf(opts.bstype.bstype, sizeof(opts.bstype.bstype), "LVOLSTORE");
  
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "Initializing lvol store\n");
  	spdk_bs_init(bs_dev, &opts, _spdk_lvs_init_cb, lvs_req);
  
  	return 0;
  }
  
  static void
  _spdk_lvs_rename_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvs_req *req = cb_arg;
  
  	if (lvolerrno != 0) {
  		req->lvserrno = lvolerrno;
  	}
  	if (req->lvserrno != 0) {
  		SPDK_ERRLOG("Lvol store rename operation failed\n");
  		/* Lvs renaming failed, so we should 'clear' new_name.
  		 * Otherwise it could cause a failure on the next attepmt to change the name to 'new_name'  */
  		snprintf(req->lvol_store->new_name,
  			 sizeof(req->lvol_store->new_name),
  			 "%s", req->lvol_store->name);
  	} else {
  		/* Update lvs name with new_name */
  		snprintf(req->lvol_store->name,
  			 sizeof(req->lvol_store->name),
  			 "%s", req->lvol_store->new_name);
  	}
  
  	req->cb_fn(req->cb_arg, req->lvserrno);
  	free(req);
  }
  
  static void
  _spdk_lvs_rename_sync_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvs_req *req = cb_arg;
  	struct spdk_blob *blob = req->lvol_store->super_blob;
  
  	if (lvolerrno < 0) {
  		req->lvserrno = lvolerrno;
  	}
  
  	spdk_blob_close(blob, _spdk_lvs_rename_cb, req);
  }
  
  static void
  _spdk_lvs_rename_open_cb(void *cb_arg, struct spdk_blob *blob, int lvolerrno)
  {
  	struct spdk_lvs_req *req = cb_arg;
  	int rc;
  
  	if (lvolerrno < 0) {
  		_spdk_lvs_rename_cb(cb_arg, lvolerrno);
  		return;
  	}
  
  	rc = spdk_blob_set_xattr(blob, "name", req->lvol_store->new_name,
  				 strlen(req->lvol_store->new_name) + 1);
  	if (rc < 0) {
  		req->lvserrno = rc;
  		_spdk_lvs_rename_sync_cb(req, rc);
  		return;
  	}
  
  	req->lvol_store->super_blob = blob;
  
  	spdk_blob_sync_md(blob, _spdk_lvs_rename_sync_cb, req);
  }
  
  void
  spdk_lvs_rename(struct spdk_lvol_store *lvs, const char *new_name,
  		spdk_lvs_op_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvs_req *req;
  	struct spdk_lvol_store *tmp;
  
  	/* Check if new name is current lvs name.
  	 * If so, return success immediately */
  	if (strncmp(lvs->name, new_name, SPDK_LVS_NAME_MAX) == 0) {
  		cb_fn(cb_arg, 0);
  		return;
  	}
  
  	/* Check if new or new_name is already used in other lvs */
  	TAILQ_FOREACH(tmp, &g_lvol_stores, link) {
  		if (!strncmp(new_name, tmp->name, SPDK_LVS_NAME_MAX) ||
  		    !strncmp(new_name, tmp->new_name, SPDK_LVS_NAME_MAX)) {
  			cb_fn(cb_arg, -EEXIST);
  			return;
  		}
  	}
  
  	req = calloc(1, sizeof(*req));
  	if (!req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
  		cb_fn(cb_arg, -ENOMEM);
  		return;
  	}
  	snprintf(lvs->new_name, sizeof(lvs->new_name), "%s", new_name);
  	req->lvol_store = lvs;
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  
  	spdk_bs_open_blob(lvs->blobstore, lvs->super_blob_id, _spdk_lvs_rename_open_cb, req);
  }
  
  static void
  _lvs_unload_cb(void *cb_arg, int lvserrno)
  {
  	struct spdk_lvs_req *lvs_req = cb_arg;
  
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "Lvol store unloaded\n");
  	assert(lvs_req->cb_fn != NULL);
  	lvs_req->cb_fn(lvs_req->cb_arg, lvserrno);
  	free(lvs_req);
  }
  
  int
  spdk_lvs_unload(struct spdk_lvol_store *lvs, spdk_lvs_op_complete cb_fn,
  		void *cb_arg)
  {
  	struct spdk_lvs_req *lvs_req;
  	struct spdk_lvol *lvol, *tmp;
  
  	if (lvs == NULL) {
  		SPDK_ERRLOG("Lvol store is NULL\n");
  		return -ENODEV;
  	}
  
  	TAILQ_FOREACH_SAFE(lvol, &lvs->lvols, link, tmp) {
  		if (lvol->action_in_progress == true) {
  			SPDK_ERRLOG("Cannot unload lvol store - operations on lvols pending\n");
  			cb_fn(cb_arg, -EBUSY);
  			return -EBUSY;
  		} else if (lvol->ref_count != 0) {
  			SPDK_ERRLOG("Lvols still open on lvol store\n");
  			cb_fn(cb_arg, -EBUSY);
  			return -EBUSY;
  		}
  	}
  
  	TAILQ_FOREACH_SAFE(lvol, &lvs->lvols, link, tmp) {
  		TAILQ_REMOVE(&lvs->lvols, lvol, link);
  		_spdk_lvol_free(lvol);
  	}
  
  	lvs_req = calloc(1, sizeof(*lvs_req));
  	if (!lvs_req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol store request pointer\n");
  		return -ENOMEM;
  	}
  
  	lvs_req->cb_fn = cb_fn;
  	lvs_req->cb_arg = cb_arg;
  
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "Unloading lvol store\n");
  	spdk_bs_unload(lvs->blobstore, _lvs_unload_cb, lvs_req);
  	_spdk_lvs_free(lvs);
  
  	return 0;
  }
  
  static void
  _lvs_destroy_cb(void *cb_arg, int lvserrno)
  {
  	struct spdk_lvs_destroy_req *lvs_req = cb_arg;
  
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "Lvol store destroyed\n");
  	assert(lvs_req->cb_fn != NULL);
  	lvs_req->cb_fn(lvs_req->cb_arg, lvserrno);
  	free(lvs_req);
  }
  
  static void
  _lvs_destroy_super_cb(void *cb_arg, int bserrno)
  {
  	struct spdk_lvs_destroy_req *lvs_req = cb_arg;
  	struct spdk_lvol_store *lvs = lvs_req->lvs;
  
  	assert(lvs != NULL);
  
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "Destroying lvol store\n");
  	spdk_bs_destroy(lvs->blobstore, _lvs_destroy_cb, lvs_req);
  	_spdk_lvs_free(lvs);
  }
  
  int
  spdk_lvs_destroy(struct spdk_lvol_store *lvs, spdk_lvs_op_complete cb_fn,
  		 void *cb_arg)
  {
  	struct spdk_lvs_destroy_req *lvs_req;
  	struct spdk_lvol *iter_lvol, *tmp;
  
  	if (lvs == NULL) {
  		SPDK_ERRLOG("Lvol store is NULL\n");
  		return -ENODEV;
  	}
  
  	TAILQ_FOREACH_SAFE(iter_lvol, &lvs->lvols, link, tmp) {
  		if (iter_lvol->action_in_progress == true) {
  			SPDK_ERRLOG("Cannot destroy lvol store - operations on lvols pending\n");
  			cb_fn(cb_arg, -EBUSY);
  			return -EBUSY;
  		} else if (iter_lvol->ref_count != 0) {
  			SPDK_ERRLOG("Lvols still open on lvol store\n");
  			cb_fn(cb_arg, -EBUSY);
  			return -EBUSY;
  		}
  	}
  
  	TAILQ_FOREACH_SAFE(iter_lvol, &lvs->lvols, link, tmp) {
  		free(iter_lvol->unique_id);
  		free(iter_lvol);
  	}
  
  	lvs_req = calloc(1, sizeof(*lvs_req));
  	if (!lvs_req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol store request pointer\n");
  		return -ENOMEM;
  	}
  
  	lvs_req->cb_fn = cb_fn;
  	lvs_req->cb_arg = cb_arg;
  	lvs_req->lvs = lvs;
  
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "Deleting super blob\n");
  	spdk_bs_delete_blob(lvs->blobstore, lvs->super_blob_id, _lvs_destroy_super_cb, lvs_req);
  
  	return 0;
  }
  
  static void
  _spdk_lvol_close_blob_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvol_req *req = cb_arg;
  	struct spdk_lvol *lvol = req->lvol;
  
  	if (lvolerrno < 0) {
  		SPDK_ERRLOG("Could not close blob on lvol\n");
  		_spdk_lvol_free(lvol);
  		goto end;
  	}
  
  	lvol->ref_count--;
  	lvol->action_in_progress = false;
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "Lvol %s closed\n", lvol->unique_id);
  
  end:
  	req->cb_fn(req->cb_arg, lvolerrno);
  	free(req);
  }
  
  bool
  spdk_lvol_deletable(struct spdk_lvol *lvol)
  {
  	size_t count;
  
  	spdk_blob_get_clones(lvol->lvol_store->blobstore, lvol->blob_id, NULL, &count);
  	return (count == 0);
  }
  
  static void
  _spdk_lvol_delete_blob_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvol_req *req = cb_arg;
  	struct spdk_lvol *lvol = req->lvol;
  
  	if (lvolerrno < 0) {
  		SPDK_ERRLOG("Could not delete blob on lvol\n");
  		goto end;
  	}
  
  	TAILQ_REMOVE(&lvol->lvol_store->lvols, lvol, link);
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "Lvol %s deleted\n", lvol->unique_id);
  
  end:
  	_spdk_lvol_free(lvol);
  	req->cb_fn(req->cb_arg, lvolerrno);
  	free(req);
  }
  
  static void
  _spdk_lvol_destroy_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvol_req *req = cb_arg;
  	struct spdk_lvol *lvol = req->lvol;
  	struct spdk_blob_store *bs = lvol->lvol_store->blobstore;
  
  	if (lvolerrno < 0) {
  		SPDK_ERRLOG("Could not close blob on lvol\n");
  		_spdk_lvol_free(lvol);
  		req->cb_fn(req->cb_arg, lvolerrno);
  		free(req);
  		return;
  	}
  	SPDK_INFOLOG(SPDK_LOG_LVOL, "Blob closed on lvol %s\n", lvol->unique_id);
  
  	spdk_bs_delete_blob(bs, lvol->blob_id, _spdk_lvol_delete_blob_cb, req);
  }
  
  static void
  _spdk_lvol_create_open_cb(void *cb_arg, struct spdk_blob *blob, int lvolerrno)
  {
  	struct spdk_lvol_with_handle_req *req = cb_arg;
  	spdk_blob_id blob_id = spdk_blob_get_id(blob);
  	struct spdk_lvol *lvol = req->lvol;
  
  	TAILQ_REMOVE(&req->lvol->lvol_store->pending_lvols, req->lvol, link);
  
  	if (lvolerrno < 0) {
  		free(lvol);
  		req->cb_fn(req->cb_arg, NULL, lvolerrno);
  		free(req);
  		return;
  	}
  
  	lvol->blob = blob;
  	lvol->blob_id = blob_id;
  
  	TAILQ_INSERT_TAIL(&lvol->lvol_store->lvols, lvol, link);
  
  	lvol->unique_id = strdup(lvol->uuid_str);
  	if (!lvol->unique_id) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol name\n");
  		spdk_blob_close(blob, _spdk_lvol_destroy_cb, req);
  		return;
  	}
  
  	lvol->ref_count++;
  
  	assert(req->cb_fn != NULL);
  	req->cb_fn(req->cb_arg, req->lvol, lvolerrno);
  	free(req);
  }
  
  static void
  _spdk_lvol_create_cb(void *cb_arg, spdk_blob_id blobid, int lvolerrno)
  {
  	struct spdk_lvol_with_handle_req *req = cb_arg;
  	struct spdk_blob_store *bs;
  
  	if (lvolerrno < 0) {
  		TAILQ_REMOVE(&req->lvol->lvol_store->pending_lvols, req->lvol, link);
  		free(req->lvol);
  		assert(req->cb_fn != NULL);
  		req->cb_fn(req->cb_arg, NULL, lvolerrno);
  		free(req);
  		return;
  	}
  
  	bs = req->lvol->lvol_store->blobstore;
  
  	spdk_bs_open_blob(bs, blobid, _spdk_lvol_create_open_cb, req);
  }
  
  static void
  spdk_lvol_get_xattr_value(void *xattr_ctx, const char *name,
  			  const void **value, size_t *value_len)
  {
  	struct spdk_lvol *lvol = xattr_ctx;
  
  	if (!strcmp(LVOL_NAME, name)) {
  		*value = lvol->name;
  		*value_len = SPDK_LVOL_NAME_MAX;
  	} else if (!strcmp("uuid", name)) {
  		*value = lvol->uuid_str;
  		*value_len = sizeof(lvol->uuid_str);
  	}
  }
  
  static int
  _spdk_lvs_verify_lvol_name(struct spdk_lvol_store *lvs, const char *name)
  {
  	struct spdk_lvol *tmp;
  
  	if (name == NULL || strnlen(name, SPDK_LVOL_NAME_MAX) == 0) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "lvol name not provided.\n");
  		return -EINVAL;
  	}
  
  	if (strnlen(name, SPDK_LVOL_NAME_MAX) == SPDK_LVOL_NAME_MAX) {
  		SPDK_ERRLOG("Name has no null terminator.\n");
  		return -EINVAL;
  	}
  
  	TAILQ_FOREACH(tmp, &lvs->lvols, link) {
  		if (!strncmp(name, tmp->name, SPDK_LVOL_NAME_MAX)) {
  			SPDK_ERRLOG("lvol with name %s already exists\n", name);
  			return -EEXIST;
  		}
  	}
  
  	TAILQ_FOREACH(tmp, &lvs->pending_lvols, link) {
  		if (!strncmp(name, tmp->name, SPDK_LVOL_NAME_MAX)) {
  			SPDK_ERRLOG("lvol with name %s is being already created\n", name);
  			return -EEXIST;
  		}
  	}
  
  	return 0;
  }
  
  int
  spdk_lvol_create(struct spdk_lvol_store *lvs, const char *name, uint64_t sz,
  		 bool thin_provision, spdk_lvol_op_with_handle_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvol_with_handle_req *req;
  	struct spdk_blob_store *bs;
  	struct spdk_lvol *lvol;
  	struct spdk_blob_opts opts;
  	uint64_t num_clusters;
  	char *xattr_names[] = {LVOL_NAME, "uuid"};
  	int rc;
  
  	if (lvs == NULL) {
  		SPDK_ERRLOG("lvol store does not exist\n");
  		return -EINVAL;
  	}
  
  	rc = _spdk_lvs_verify_lvol_name(lvs, name);
  	if (rc < 0) {
  		return rc;
  	}
  
  	bs = lvs->blobstore;
  
  	req = calloc(1, sizeof(*req));
  	if (!req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
  		return -ENOMEM;
  	}
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  
  	lvol = calloc(1, sizeof(*lvol));
  	if (!lvol) {
  		free(req);
  		SPDK_ERRLOG("Cannot alloc memory for lvol base pointer\n");
  		return -ENOMEM;
  	}
  	lvol->lvol_store = lvs;
  	num_clusters = divide_round_up(sz, spdk_bs_get_cluster_size(bs));
  	lvol->thin_provision = thin_provision;
  	snprintf(lvol->name, sizeof(lvol->name), "%s", name);
  	TAILQ_INSERT_TAIL(&lvol->lvol_store->pending_lvols, lvol, link);
  	spdk_uuid_generate(&lvol->uuid);
  	spdk_uuid_fmt_lower(lvol->uuid_str, sizeof(lvol->uuid_str), &lvol->uuid);
  	req->lvol = lvol;
  
  	spdk_blob_opts_init(&opts);
  	opts.thin_provision = thin_provision;
  	opts.num_clusters = num_clusters;
  	opts.xattrs.count = SPDK_COUNTOF(xattr_names);
  	opts.xattrs.names = xattr_names;
  	opts.xattrs.ctx = lvol;
  	opts.xattrs.get_value = spdk_lvol_get_xattr_value;
  
  	spdk_bs_create_blob_ext(lvs->blobstore, &opts, _spdk_lvol_create_cb, req);
  
  	return 0;
  }
  
  void
  spdk_lvol_create_snapshot(struct spdk_lvol *origlvol, const char *snapshot_name,
  			  spdk_lvol_op_with_handle_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvol_store *lvs;
  	struct spdk_lvol *newlvol;
  	struct spdk_blob *origblob;
  	struct spdk_lvol_with_handle_req *req;
  	struct spdk_blob_xattr_opts snapshot_xattrs;
  	char *xattr_names[] = {LVOL_NAME, "uuid"};
  	int rc;
  
  	if (origlvol == NULL) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "Lvol not provided.\n");
  		cb_fn(cb_arg, NULL, -EINVAL);
  		return;
  	}
  
  	origblob = origlvol->blob;
  	lvs = origlvol->lvol_store;
  	if (lvs == NULL) {
  		SPDK_ERRLOG("lvol store does not exist\n");
  		cb_fn(cb_arg, NULL, -EINVAL);
  		return;
  	}
  
  	rc = _spdk_lvs_verify_lvol_name(lvs, snapshot_name);
  	if (rc < 0) {
  		cb_fn(cb_arg, NULL, rc);
  		return;
  	}
  
  	req = calloc(1, sizeof(*req));
  	if (!req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
  		cb_fn(cb_arg, NULL, -ENOMEM);
  		return;
  	}
  
  	newlvol = calloc(1, sizeof(*newlvol));
  	if (!newlvol) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol base pointer\n");
  		free(req);
  		cb_fn(cb_arg, NULL, -ENOMEM);
  		return;
  	}
  
  	newlvol->lvol_store = origlvol->lvol_store;
  	snprintf(newlvol->name, sizeof(newlvol->name), "%s", snapshot_name);
  	TAILQ_INSERT_TAIL(&newlvol->lvol_store->pending_lvols, newlvol, link);
  	spdk_uuid_generate(&newlvol->uuid);
  	spdk_uuid_fmt_lower(newlvol->uuid_str, sizeof(newlvol->uuid_str), &newlvol->uuid);
  	snapshot_xattrs.count = SPDK_COUNTOF(xattr_names);
  	snapshot_xattrs.ctx = newlvol;
  	snapshot_xattrs.names = xattr_names;
  	snapshot_xattrs.get_value = spdk_lvol_get_xattr_value;
  	req->lvol = newlvol;
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  
  	spdk_bs_create_snapshot(lvs->blobstore, spdk_blob_get_id(origblob), &snapshot_xattrs,
  				_spdk_lvol_create_cb, req);
  }
  
  void
  spdk_lvol_create_clone(struct spdk_lvol *origlvol, const char *clone_name,
  		       spdk_lvol_op_with_handle_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvol *newlvol;
  	struct spdk_lvol_with_handle_req *req;
  	struct spdk_lvol_store *lvs;
  	struct spdk_blob *origblob;
  	struct spdk_blob_xattr_opts clone_xattrs;
  	char *xattr_names[] = {LVOL_NAME, "uuid"};
  	int rc;
  
  	if (origlvol == NULL) {
  		SPDK_INFOLOG(SPDK_LOG_LVOL, "Lvol not provided.\n");
  		cb_fn(cb_arg, NULL, -EINVAL);
  		return;
  	}
  
  	origblob = origlvol->blob;
  	lvs = origlvol->lvol_store;
  	if (lvs == NULL) {
  		SPDK_ERRLOG("lvol store does not exist\n");
  		cb_fn(cb_arg, NULL, -EINVAL);
  		return;
  	}
  
  	rc = _spdk_lvs_verify_lvol_name(lvs, clone_name);
  	if (rc < 0) {
  		cb_fn(cb_arg, NULL, rc);
  		return;
  	}
  
  	req = calloc(1, sizeof(*req));
  	if (!req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
  		cb_fn(cb_arg, NULL, -ENOMEM);
  		return;
  	}
  
  	newlvol = calloc(1, sizeof(*newlvol));
  	if (!newlvol) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol base pointer\n");
  		free(req);
  		cb_fn(cb_arg, NULL, -ENOMEM);
  		return;
  	}
  
  	newlvol->lvol_store = lvs;
  	snprintf(newlvol->name, sizeof(newlvol->name), "%s", clone_name);
  	TAILQ_INSERT_TAIL(&newlvol->lvol_store->pending_lvols, newlvol, link);
  	spdk_uuid_generate(&newlvol->uuid);
  	spdk_uuid_fmt_lower(newlvol->uuid_str, sizeof(newlvol->uuid_str), &newlvol->uuid);
  	clone_xattrs.count = SPDK_COUNTOF(xattr_names);
  	clone_xattrs.ctx = newlvol;
  	clone_xattrs.names = xattr_names;
  	clone_xattrs.get_value = spdk_lvol_get_xattr_value;
  	req->lvol = newlvol;
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  
  	spdk_bs_create_clone(lvs->blobstore, spdk_blob_get_id(origblob), &clone_xattrs,
  			     _spdk_lvol_create_cb,
  			     req);
  }
  
  static void
  _spdk_lvol_resize_done(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvol_req *req = cb_arg;
  
  	req->cb_fn(req->cb_arg,  lvolerrno);
  	free(req);
  }
  
  static void
  _spdk_lvol_blob_resize_cb(void *cb_arg, int bserrno)
  {
  	struct spdk_lvol_req *req = cb_arg;
  	struct spdk_lvol *lvol = req->lvol;
  
  	if (bserrno != 0) {
  		req->cb_fn(req->cb_arg, bserrno);
  		free(req);
  		return;
  	}
  
  	spdk_blob_sync_md(lvol->blob, _spdk_lvol_resize_done, req);
  }
  
  void
  spdk_lvol_resize(struct spdk_lvol *lvol, uint64_t sz,
  		 spdk_lvol_op_complete cb_fn, void *cb_arg)
  {
  	struct spdk_blob *blob = lvol->blob;
  	struct spdk_lvol_store *lvs = lvol->lvol_store;
  	struct spdk_lvol_req *req;
  	uint64_t new_clusters = divide_round_up(sz, spdk_bs_get_cluster_size(lvs->blobstore));
  
  	req = calloc(1, sizeof(*req));
  	if (!req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
  		cb_fn(cb_arg, -ENOMEM);
  		return;
  	}
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  	req->lvol = lvol;
  
  	spdk_blob_resize(blob, new_clusters, _spdk_lvol_blob_resize_cb, req);
  }
  
  static void
  _spdk_lvol_rename_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvol_req *req = cb_arg;
  
  	if (lvolerrno != 0) {
  		SPDK_ERRLOG("Lvol rename operation failed\n");
  	} else {
  		snprintf(req->lvol->name, sizeof(req->lvol->name), "%s", req->name);
  	}
  
  	req->cb_fn(req->cb_arg, lvolerrno);
  	free(req);
  }
  
  void
  spdk_lvol_rename(struct spdk_lvol *lvol, const char *new_name,
  		 spdk_lvol_op_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvol *tmp;
  	struct spdk_blob *blob = lvol->blob;
  	struct spdk_lvol_req *req;
  	int rc;
  
  	/* Check if new name is current lvol name.
  	 * If so, return success immediately */
  	if (strncmp(lvol->name, new_name, SPDK_LVOL_NAME_MAX) == 0) {
  		cb_fn(cb_arg, 0);
  		return;
  	}
  
  	/* Check if lvol with 'new_name' already exists in lvolstore */
  	TAILQ_FOREACH(tmp, &lvol->lvol_store->lvols, link) {
  		if (strncmp(tmp->name, new_name, SPDK_LVOL_NAME_MAX) == 0) {
  			SPDK_ERRLOG("Lvol %s already exists in lvol store %s\n", new_name, lvol->lvol_store->name);
  			cb_fn(cb_arg, -EEXIST);
  			return;
  		}
  	}
  
  	req = calloc(1, sizeof(*req));
  	if (!req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
  		cb_fn(cb_arg, -ENOMEM);
  		return;
  	}
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  	req->lvol = lvol;
  	snprintf(req->name, sizeof(req->name), "%s", new_name);
  
  	rc = spdk_blob_set_xattr(blob, "name", new_name, strlen(new_name) + 1);
  	if (rc < 0) {
  		free(req);
  		cb_fn(cb_arg, rc);
  		return;
  	}
  
  	spdk_blob_sync_md(blob, _spdk_lvol_rename_cb, req);
  }
  
  void
  spdk_lvol_destroy(struct spdk_lvol *lvol, spdk_lvol_op_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvol_req *req;
  	struct spdk_blob_store *bs = lvol->lvol_store->blobstore;
  
  	assert(cb_fn != NULL);
  
  	if (lvol == NULL) {
  		SPDK_ERRLOG("lvol does not exist\n");
  		cb_fn(cb_arg, -ENODEV);
  		return;
  	}
  
  	if (lvol->ref_count != 0) {
  		SPDK_ERRLOG("Cannot destroy lvol %s because it is still open\n", lvol->unique_id);
  		cb_fn(cb_arg, -EBUSY);
  		return;
  	}
  
  	lvol->action_in_progress = true;
  
  	req = calloc(1, sizeof(*req));
  	if (!req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
  		cb_fn(cb_arg, -ENOMEM);
  		return;
  	}
  
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  	req->lvol = lvol;
  
  	spdk_bs_delete_blob(bs, lvol->blob_id, _spdk_lvol_delete_blob_cb, req);
  }
  
  void
  spdk_lvol_close(struct spdk_lvol *lvol, spdk_lvol_op_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvol_req *req;
  
  	assert(cb_fn != NULL);
  
  	if (lvol == NULL) {
  		SPDK_ERRLOG("lvol does not exist\n");
  		cb_fn(cb_arg, -ENODEV);
  		return;
  	}
  
  	if (lvol->ref_count > 1) {
  		lvol->ref_count--;
  		cb_fn(cb_arg, 0);
  		return;
  	} else if (lvol->ref_count == 0) {
  		cb_fn(cb_arg, -EINVAL);
  		return;
  	}
  
  	lvol->action_in_progress = true;
  
  	req = calloc(1, sizeof(*req));
  	if (!req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
  		cb_fn(cb_arg, -ENOMEM);
  		return;
  	}
  
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  	req->lvol = lvol;
  
  	spdk_blob_close(lvol->blob, _spdk_lvol_close_blob_cb, req);
  }
  
  struct spdk_io_channel *
  spdk_lvol_get_io_channel(struct spdk_lvol *lvol)
  {
  	return spdk_bs_alloc_io_channel(lvol->lvol_store->blobstore);
  }
  
  static void
  _spdk_lvol_inflate_cb(void *cb_arg, int lvolerrno)
  {
  	struct spdk_lvol_req *req = cb_arg;
  
  	spdk_bs_free_io_channel(req->channel);
  
  	if (lvolerrno < 0) {
  		SPDK_ERRLOG("Could not inflate lvol\n");
  	}
  
  	req->cb_fn(req->cb_arg, lvolerrno);
  	free(req);
  }
  
  void
  spdk_lvol_inflate(struct spdk_lvol *lvol, spdk_lvol_op_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvol_req *req;
  	struct spdk_blob *blob = lvol->blob;
  	spdk_blob_id blob_id = spdk_blob_get_id(blob);
  
  	assert(cb_fn != NULL);
  
  	if (lvol == NULL) {
  		SPDK_ERRLOG("Lvol does not exist\n");
  		cb_fn(cb_arg, -ENODEV);
  		return;
  	}
  
  	req = calloc(1, sizeof(*req));
  	if (!req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
  		cb_fn(cb_arg, -ENOMEM);
  		return;
  	}
  
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  	req->channel = spdk_bs_alloc_io_channel(lvol->lvol_store->blobstore);
  	if (req->channel == NULL) {
  		SPDK_ERRLOG("Cannot alloc io channel for lvol inflate request\n");
  		free(req);
  		cb_fn(cb_arg, -ENOMEM);
  		return;
  	}
  
  	spdk_bs_inflate_blob(lvol->lvol_store->blobstore, req->channel, blob_id, _spdk_lvol_inflate_cb,
  			     req);
  }
  
  void
  spdk_lvol_decouple_parent(struct spdk_lvol *lvol, spdk_lvol_op_complete cb_fn, void *cb_arg)
  {
  	struct spdk_lvol_req *req;
  	struct spdk_blob *blob = lvol->blob;
  	spdk_blob_id blob_id = spdk_blob_get_id(blob);
  
  	assert(cb_fn != NULL);
  
  	if (lvol == NULL) {
  		SPDK_ERRLOG("Lvol does not exist\n");
  		cb_fn(cb_arg, -ENODEV);
  		return;
  	}
  
  	req = calloc(1, sizeof(*req));
  	if (!req) {
  		SPDK_ERRLOG("Cannot alloc memory for lvol request pointer\n");
  		cb_fn(cb_arg, -ENOMEM);
  		return;
  	}
  
  	req->cb_fn = cb_fn;
  	req->cb_arg = cb_arg;
  	req->channel = spdk_bs_alloc_io_channel(lvol->lvol_store->blobstore);
  	if (req->channel == NULL) {
  		SPDK_ERRLOG("Cannot alloc io channel for lvol inflate request\n");
  		free(req);
  		cb_fn(cb_arg, -ENOMEM);
  		return;
  	}
  
  	spdk_bs_blob_decouple_parent(lvol->lvol_store->blobstore, req->channel, blob_id,
  				     _spdk_lvol_inflate_cb, req);
  }
  