/*- * 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 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) { pthread_mutex_lock(&g_lvol_stores_mutex); if (lvs->on_list) { TAILQ_REMOVE(&g_lvol_stores, lvs, link); } pthread_mutex_unlock(&g_lvol_stores_mutex); free(lvs); } static void _spdk_lvol_free(struct spdk_lvol *lvol) { 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; struct spdk_blob_open_opts opts; 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_blob_open_opts_init(&opts); opts.clear_method = lvol->clear_method; spdk_bs_open_blob_ext(lvol->lvol_store->blobstore, lvol->blob_id, &opts, _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; const char *attr; const enum blob_clear_method *clear_method; 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))) { snprintf(lvol->unique_id, sizeof(lvol->unique_id), "%s", lvol->uuid_str); } else { spdk_uuid_fmt_lower(lvol->unique_id, sizeof(lvol->unique_id), &lvol->lvol_store->uuid); value_len = strlen(lvol->unique_id); snprintf(lvol->unique_id + value_len, sizeof(lvol->unique_id) - value_len, "_%"PRIu64, (uint64_t)blob_id); } 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; } rc = spdk_blob_get_xattr_value(blob, "clear_method", (const void **)&clear_method, &value_len); if (rc != 0) { lvol->clear_method = BLOB_CLEAR_WITH_DEFAULT; } else { lvol->clear_method = *clear_method; } 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); } _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_remove_bs_on_error_cb(void *cb_arg, int bserrno) { } 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_bs_destroy(lvs->blobstore, _spdk_remove_bs_on_error_cb, NULL); _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_bs_destroy(lvs->blobstore, _spdk_remove_bs_on_error_cb, NULL); _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_bs_destroy(lvs->blobstore, _spdk_remove_bs_on_error_cb, NULL); _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_bs_destroy(lvs->blobstore, _spdk_remove_bs_on_error_cb, NULL); _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_bs_destroy(lvs->blobstore, _spdk_remove_bs_on_error_cb, NULL); _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; o->clear_method = LVS_CLEAR_WITH_UNMAP; 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; bs_opts->clear_method = (enum bs_clear_method)o->clear_method; } 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 */ pthread_mutex_lock(&g_lvol_stores_mutex); 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)) { pthread_mutex_unlock(&g_lvol_stores_mutex); cb_fn(cb_arg, -EEXIST); return; } } pthread_mutex_unlock(&g_lvol_stores_mutex); 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); } 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 remove blob on lvol gracefully - forced removal\n"); } else { SPDK_INFOLOG(SPDK_LOG_LVOL, "Lvol %s deleted\n", lvol->unique_id); } TAILQ_REMOVE(&lvol->lvol_store->lvols, lvol, link); _spdk_lvol_free(lvol); req->cb_fn(req->cb_arg, lvolerrno); free(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); snprintf(lvol->unique_id, sizeof(lvol->unique_id), "%s", lvol->uuid_str); 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; struct spdk_blob_open_opts opts; 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; } spdk_blob_open_opts_init(&opts); opts.clear_method = req->lvol->clear_method; bs = req->lvol->lvol_store->blobstore; spdk_bs_open_blob_ext(bs, blobid, &opts, _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); } else if (!strcmp("clear_method", name)) { *value = &lvol->clear_method; *value_len = sizeof(int); } } 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, enum lvol_clear_method clear_method, 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", "clear_method"}; 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 = spdk_divide_round_up(sz, spdk_bs_get_cluster_size(bs)); lvol->thin_provision = thin_provision; lvol->clear_method = (enum blob_clear_method)clear_method; 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 = spdk_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_set_read_only_cb(void *cb_arg, int lvolerrno) { struct spdk_lvol_req *req = cb_arg; req->cb_fn(req->cb_arg, lvolerrno); free(req); } void spdk_lvol_set_read_only(struct spdk_lvol *lvol, spdk_lvol_op_complete cb_fn, void *cb_arg) { struct spdk_lvol_req *req; 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; spdk_blob_set_read_only(lvol->blob); spdk_blob_sync_md(lvol->blob, _spdk_lvol_set_read_only_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; 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; bs = lvol->lvol_store->blobstore; 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; spdk_blob_id blob_id; 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; } blob_id = spdk_blob_get_id(lvol->blob); 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; spdk_blob_id blob_id; 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; } blob_id = spdk_blob_get_id(lvol->blob); spdk_bs_blob_decouple_parent(lvol->lvol_store->blobstore, req->channel, blob_id, _spdk_lvol_inflate_cb, req); }