update source to Ceph Pacific 16.2.2

[ceph.git] / ceph / src / spdk / examples / bdev / fio_plugin / fio_plugin.c

/*-
 *   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/stdinc.h"

#include "spdk/bdev.h"
#include "spdk/accel_engine.h"
#include "spdk/conf.h"
#include "spdk/env.h"
#include "spdk/thread.h"
#include "spdk/log.h"
#include "spdk/string.h"
#include "spdk/queue.h"
#include "spdk/util.h"

#include "spdk_internal/thread.h"
#include "spdk_internal/event.h"

#include "config-host.h"
#include "fio.h"
#include "optgroup.h"

/* FreeBSD is missing CLOCK_MONOTONIC_RAW,
 * so alternative is provided. */
#ifndef CLOCK_MONOTONIC_RAW /* Defined in glibc bits/time.h */
#define CLOCK_MONOTONIC_RAW CLOCK_MONOTONIC
#endif

struct spdk_fio_options {
        void *pad;
        char *conf;
        char *json_conf;
        unsigned mem_mb;
        bool mem_single_seg;
};

struct spdk_fio_request {
        struct io_u             *io;
        struct thread_data      *td;
};

struct spdk_fio_target {
        struct spdk_bdev        *bdev;
        struct spdk_bdev_desc   *desc;
        struct spdk_io_channel  *ch;

        TAILQ_ENTRY(spdk_fio_target) link;
};

struct spdk_fio_thread {
        struct thread_data              *td; /* fio thread context */
        struct spdk_thread              *thread; /* spdk thread context */

        TAILQ_HEAD(, spdk_fio_target)   targets;
        bool                            failed; /* true if the thread failed to initialize */

        struct io_u             **iocq;         /* io completion queue */
        unsigned int            iocq_count;     /* number of iocq entries filled by last getevents */
        unsigned int            iocq_size;      /* number of iocq entries allocated */
};

static bool g_spdk_env_initialized = false;
static const char *g_json_config_file = NULL;

static int spdk_fio_init(struct thread_data *td);
static void spdk_fio_cleanup(struct thread_data *td);
static size_t spdk_fio_poll_thread(struct spdk_fio_thread *fio_thread);

/* Default polling timeout (ns) */
#define SPDK_FIO_POLLING_TIMEOUT 1000000000ULL

static int
spdk_fio_init_thread(struct thread_data *td)
{
        struct spdk_fio_thread *fio_thread;

        fio_thread = calloc(1, sizeof(*fio_thread));
        if (!fio_thread) {
                SPDK_ERRLOG("failed to allocate thread local context\n");
                return -1;
        }

        fio_thread->td = td;
        td->io_ops_data = fio_thread;

        fio_thread->thread = spdk_thread_create("fio_thread", NULL);
        if (!fio_thread->thread) {
                free(fio_thread);
                SPDK_ERRLOG("failed to allocate thread\n");
                return -1;
        }
        spdk_set_thread(fio_thread->thread);

        fio_thread->iocq_size = td->o.iodepth;
        fio_thread->iocq = calloc(fio_thread->iocq_size, sizeof(struct io_u *));
        assert(fio_thread->iocq != NULL);

        TAILQ_INIT(&fio_thread->targets);

        return 0;
}

static void
spdk_fio_bdev_close_targets(void *arg)
{
        struct spdk_fio_thread *fio_thread = arg;
        struct spdk_fio_target *target, *tmp;

        TAILQ_FOREACH_SAFE(target, &fio_thread->targets, link, tmp) {
                TAILQ_REMOVE(&fio_thread->targets, target, link);
                spdk_put_io_channel(target->ch);
                spdk_bdev_close(target->desc);
                free(target);
        }
}

static void
spdk_fio_cleanup_thread(struct spdk_fio_thread *fio_thread)
{
        spdk_thread_send_msg(fio_thread->thread, spdk_fio_bdev_close_targets, fio_thread);

        while (!spdk_thread_is_idle(fio_thread->thread)) {
                spdk_fio_poll_thread(fio_thread);
        }

        spdk_set_thread(fio_thread->thread);

        spdk_thread_exit(fio_thread->thread);
        while (!spdk_thread_is_exited(fio_thread->thread)) {
                spdk_thread_poll(fio_thread->thread, 0, 0);
        }
        spdk_thread_destroy(fio_thread->thread);
        free(fio_thread->iocq);
        free(fio_thread);
}

static void
spdk_fio_calc_timeout(struct spdk_fio_thread *fio_thread, struct timespec *ts)
{
        uint64_t timeout, now;

        if (spdk_thread_has_active_pollers(fio_thread->thread)) {
                return;
        }

        timeout = spdk_thread_next_poller_expiration(fio_thread->thread);
        now = spdk_get_ticks();

        if (timeout == 0) {
                timeout = now + (SPDK_FIO_POLLING_TIMEOUT * spdk_get_ticks_hz()) / SPDK_SEC_TO_NSEC;
        }

        if (timeout > now) {
                timeout = ((timeout - now) * SPDK_SEC_TO_NSEC) / spdk_get_ticks_hz() +
                          ts->tv_sec * SPDK_SEC_TO_NSEC + ts->tv_nsec;

                ts->tv_sec  = timeout / SPDK_SEC_TO_NSEC;
                ts->tv_nsec = timeout % SPDK_SEC_TO_NSEC;
        }
}

static pthread_t g_init_thread_id = 0;
static pthread_mutex_t g_init_mtx = PTHREAD_MUTEX_INITIALIZER;
static pthread_cond_t g_init_cond;
static bool g_poll_loop = true;

static void
spdk_fio_bdev_init_done(int rc, void *cb_arg)
{
        *(bool *)cb_arg = true;
}

static void
spdk_fio_bdev_init_start(void *arg)
{
        bool *done = arg;

        if (g_json_config_file != NULL) {
                spdk_app_json_config_load(g_json_config_file, SPDK_DEFAULT_RPC_ADDR,
                                          spdk_fio_bdev_init_done, done, true);
        } else {
                spdk_subsystem_init(spdk_fio_bdev_init_done, done);
        }
}

static void
spdk_fio_bdev_fini_done(void *cb_arg)
{
        *(bool *)cb_arg = true;
}

static void
spdk_fio_bdev_fini_start(void *arg)
{
        bool *done = arg;

        spdk_subsystem_fini(spdk_fio_bdev_fini_done, done);
}

static void *
spdk_init_thread_poll(void *arg)
{
        struct spdk_fio_options         *eo = arg;
        struct spdk_fio_thread          *fio_thread;
        struct spdk_conf                *config = NULL;
        struct spdk_env_opts            opts;
        bool                            done;
        int                             rc;
        struct timespec                 ts;
        struct thread_data              td = {};

        /* Create a dummy thread data for use on the initialization thread. */
        td.o.iodepth = 32;
        td.eo = eo;

        /* Parse the SPDK configuration file */
        eo = arg;

        if (eo->conf && eo->json_conf) {
                SPDK_ERRLOG("Cannot provide two types of configuration files\n");
                rc = EINVAL;
                goto err_exit;
        } else if (eo->conf && strlen(eo->conf)) {
                config = spdk_conf_allocate();
                if (!config) {
                        SPDK_ERRLOG("Unable to allocate configuration file\n");
                        rc = ENOMEM;
                        goto err_exit;
                }

                rc = spdk_conf_read(config, eo->conf);
                if (rc != 0) {
                        SPDK_ERRLOG("Invalid configuration file format\n");
                        spdk_conf_free(config);
                        goto err_exit;
                }
                if (spdk_conf_first_section(config) == NULL) {
                        SPDK_ERRLOG("Invalid configuration file format\n");
                        spdk_conf_free(config);
                        rc = EINVAL;
                        goto err_exit;
                }
                spdk_conf_set_as_default(config);
        } else if (eo->json_conf && strlen(eo->json_conf)) {
                g_json_config_file = eo->json_conf;
        } else {
                SPDK_ERRLOG("No configuration file provided\n");
                rc = EINVAL;
                goto err_exit;
        }

        /* Initialize the environment library */
        spdk_env_opts_init(&opts);
        opts.name = "fio";

        if (eo->mem_mb) {
                opts.mem_size = eo->mem_mb;
        }
        opts.hugepage_single_segments = eo->mem_single_seg;

        if (spdk_env_init(&opts) < 0) {
                SPDK_ERRLOG("Unable to initialize SPDK env\n");
                spdk_conf_free(config);
                rc = EINVAL;
                goto err_exit;
        }
        spdk_unaffinitize_thread();

        spdk_thread_lib_init(NULL, 0);

        /* Create an SPDK thread temporarily */
        rc = spdk_fio_init_thread(&td);
        if (rc < 0) {
                SPDK_ERRLOG("Failed to create initialization thread\n");
                goto err_exit;
        }

        fio_thread = td.io_ops_data;

        /* Initialize the bdev layer */
        done = false;
        spdk_thread_send_msg(fio_thread->thread, spdk_fio_bdev_init_start, &done);

        do {
                spdk_fio_poll_thread(fio_thread);
        } while (!done);

        /*
         * Continue polling until there are no more events.
         * This handles any final events posted by pollers.
         */
        while (spdk_fio_poll_thread(fio_thread) > 0) {};

        /* Set condition variable */
        pthread_mutex_lock(&g_init_mtx);
        pthread_cond_signal(&g_init_cond);

        while (g_poll_loop) {
                spdk_fio_poll_thread(fio_thread);

                clock_gettime(CLOCK_MONOTONIC, &ts);
                spdk_fio_calc_timeout(fio_thread, &ts);

                rc = pthread_cond_timedwait(&g_init_cond, &g_init_mtx, &ts);
                if (rc != ETIMEDOUT) {
                        break;
                }
        }

        pthread_mutex_unlock(&g_init_mtx);

        /* Finalize the bdev layer */
        done = false;
        spdk_thread_send_msg(fio_thread->thread, spdk_fio_bdev_fini_start, &done);

        do {
                spdk_fio_poll_thread(fio_thread);
        } while (!done && !spdk_thread_is_idle(fio_thread->thread));

        spdk_fio_cleanup_thread(fio_thread);

        pthread_exit(NULL);

err_exit:
        exit(rc);
        return NULL;
}

static int
spdk_fio_init_env(struct thread_data *td)
{
        pthread_condattr_t attr;
        int rc = -1;

        if (pthread_condattr_init(&attr)) {
                SPDK_ERRLOG("Unable to initialize condition variable\n");
                return -1;
        }

        if (pthread_condattr_setclock(&attr, CLOCK_MONOTONIC)) {
                SPDK_ERRLOG("Unable to initialize condition variable\n");
                goto out;
        }

        if (pthread_cond_init(&g_init_cond, &attr)) {
                SPDK_ERRLOG("Unable to initialize condition variable\n");
                goto out;
        }

        /*
         * Spawn a thread to handle initialization operations and to poll things
         * like the admin queues periodically.
         */
        rc = pthread_create(&g_init_thread_id, NULL, &spdk_init_thread_poll, td->eo);
        if (rc != 0) {
                SPDK_ERRLOG("Unable to spawn thread to poll admin queue. It won't be polled.\n");
        }

        /* Wait for background thread to advance past the initialization */
        pthread_mutex_lock(&g_init_mtx);
        pthread_cond_wait(&g_init_cond, &g_init_mtx);
        pthread_mutex_unlock(&g_init_mtx);
out:
        pthread_condattr_destroy(&attr);
        return rc;
}

/* Called for each thread to fill in the 'real_file_size' member for
 * each file associated with this thread. This is called prior to
 * the init operation (spdk_fio_init()) below. This call will occur
 * on the initial start up thread if 'create_serialize' is true, or
 * on the thread actually associated with 'thread_data' if 'create_serialize'
 * is false.
 */
static int
spdk_fio_setup(struct thread_data *td)
{
        unsigned int i;
        struct fio_file *f;

        /* we might be running in a daemonized FIO instance where standard
         * input and output were closed and fds 0, 1, and 2 are reused
         * for something important by FIO. We can't ensure we won't print
         * anything (and so will our dependencies, e.g. DPDK), so abort early.
         * (is_backend is an fio global variable)
         */
        if (is_backend) {
                char buf[1024];
                snprintf(buf, sizeof(buf),
                         "SPDK FIO plugin won't work with daemonized FIO server.");
                fio_server_text_output(FIO_LOG_ERR, buf, sizeof(buf));
                return -1;
        }

        if (!td->o.use_thread) {
                SPDK_ERRLOG("must set thread=1 when using spdk plugin\n");
                return -1;
        }

        if (!g_spdk_env_initialized) {
                if (spdk_fio_init_env(td)) {
                        SPDK_ERRLOG("failed to initialize\n");
                        return -1;
                }

                g_spdk_env_initialized = true;
        }

        if (td->o.nr_files == 1 && strcmp(td->files[0]->file_name, "*") == 0) {
                struct spdk_bdev *bdev;

                /* add all available bdevs as fio targets */
                for (bdev = spdk_bdev_first_leaf(); bdev; bdev = spdk_bdev_next_leaf(bdev)) {
                        add_file(td, spdk_bdev_get_name(bdev), 0, 1);
                }
        }

        for_each_file(td, f, i) {
                struct spdk_bdev *bdev;

                if (strcmp(f->file_name, "*") == 0) {
                        continue;
                }

                bdev = spdk_bdev_get_by_name(f->file_name);
                if (!bdev) {
                        SPDK_ERRLOG("Unable to find bdev with name %s\n", f->file_name);
                        return -1;
                }

                f->real_file_size = spdk_bdev_get_num_blocks(bdev) *
                                    spdk_bdev_get_block_size(bdev);

        }

        return 0;
}

static void
spdk_fio_bdev_open(void *arg)
{
        struct thread_data *td = arg;
        struct spdk_fio_thread *fio_thread;
        unsigned int i;
        struct fio_file *f;
        int rc;

        fio_thread = td->io_ops_data;

        for_each_file(td, f, i) {
                struct spdk_fio_target *target;

                if (strcmp(f->file_name, "*") == 0) {
                        continue;
                }

                target = calloc(1, sizeof(*target));
                if (!target) {
                        SPDK_ERRLOG("Unable to allocate memory for I/O target.\n");
                        fio_thread->failed = true;
                        return;
                }

                target->bdev = spdk_bdev_get_by_name(f->file_name);
                if (!target->bdev) {
                        SPDK_ERRLOG("Unable to find bdev with name %s\n", f->file_name);
                        free(target);
                        fio_thread->failed = true;
                        return;
                }

                rc = spdk_bdev_open(target->bdev, true, NULL, NULL, &target->desc);
                if (rc) {
                        SPDK_ERRLOG("Unable to open bdev %s\n", f->file_name);
                        free(target);
                        fio_thread->failed = true;
                        return;
                }

                target->ch = spdk_bdev_get_io_channel(target->desc);
                if (!target->ch) {
                        SPDK_ERRLOG("Unable to get I/O channel for bdev.\n");
                        spdk_bdev_close(target->desc);
                        free(target);
                        fio_thread->failed = true;
                        return;
                }

                f->engine_data = target;

                TAILQ_INSERT_TAIL(&fio_thread->targets, target, link);
        }
}

/* Called for each thread, on that thread, shortly after the thread
 * starts.
 */
static int
spdk_fio_init(struct thread_data *td)
{
        struct spdk_fio_thread *fio_thread;

        spdk_fio_init_thread(td);

        fio_thread = td->io_ops_data;
        fio_thread->failed = false;

        spdk_thread_send_msg(fio_thread->thread, spdk_fio_bdev_open, td);

        while (spdk_fio_poll_thread(fio_thread) > 0) {}

        if (fio_thread->failed) {
                return -1;
        }

        return 0;
}

static void
spdk_fio_cleanup(struct thread_data *td)
{
        struct spdk_fio_thread *fio_thread = td->io_ops_data;

        spdk_fio_cleanup_thread(fio_thread);
        td->io_ops_data = NULL;
}

static int
spdk_fio_open(struct thread_data *td, struct fio_file *f)
{

        return 0;
}

static int
spdk_fio_close(struct thread_data *td, struct fio_file *f)
{
        return 0;
}

static int
spdk_fio_iomem_alloc(struct thread_data *td, size_t total_mem)
{
        td->orig_buffer = spdk_dma_zmalloc(total_mem, 0x1000, NULL);
        return td->orig_buffer == NULL;
}

static void
spdk_fio_iomem_free(struct thread_data *td)
{
        spdk_dma_free(td->orig_buffer);
}

static int
spdk_fio_io_u_init(struct thread_data *td, struct io_u *io_u)
{
        struct spdk_fio_request *fio_req;

        io_u->engine_data = NULL;

        fio_req = calloc(1, sizeof(*fio_req));
        if (fio_req == NULL) {
                return 1;
        }
        fio_req->io = io_u;
        fio_req->td = td;

        io_u->engine_data = fio_req;

        return 0;
}

static void
spdk_fio_io_u_free(struct thread_data *td, struct io_u *io_u)
{
        struct spdk_fio_request *fio_req = io_u->engine_data;

        if (fio_req) {
                assert(fio_req->io == io_u);
                free(fio_req);
                io_u->engine_data = NULL;
        }
}

static void
spdk_fio_completion_cb(struct spdk_bdev_io *bdev_io,
                       bool success,
                       void *cb_arg)
{
        struct spdk_fio_request         *fio_req = cb_arg;
        struct thread_data              *td = fio_req->td;
        struct spdk_fio_thread          *fio_thread = td->io_ops_data;

        assert(fio_thread->iocq_count < fio_thread->iocq_size);
        fio_req->io->error = success ? 0 : EIO;
        fio_thread->iocq[fio_thread->iocq_count++] = fio_req->io;

        spdk_bdev_free_io(bdev_io);
}

#if FIO_IOOPS_VERSION >= 24
typedef enum fio_q_status fio_q_status_t;
#else
typedef int fio_q_status_t;
#endif

static fio_q_status_t
spdk_fio_queue(struct thread_data *td, struct io_u *io_u)
{
        int rc = 1;
        struct spdk_fio_request *fio_req = io_u->engine_data;
        struct spdk_fio_target *target = io_u->file->engine_data;

        assert(fio_req->td == td);

        if (!target) {
                SPDK_ERRLOG("Unable to look up correct I/O target.\n");
                fio_req->io->error = ENODEV;
                return FIO_Q_COMPLETED;
        }

        switch (io_u->ddir) {
        case DDIR_READ:
                rc = spdk_bdev_read(target->desc, target->ch,
                                    io_u->buf, io_u->offset, io_u->xfer_buflen,
                                    spdk_fio_completion_cb, fio_req);
                break;
        case DDIR_WRITE:
                rc = spdk_bdev_write(target->desc, target->ch,
                                     io_u->buf, io_u->offset, io_u->xfer_buflen,
                                     spdk_fio_completion_cb, fio_req);
                break;
        case DDIR_TRIM:
                rc = spdk_bdev_unmap(target->desc, target->ch,
                                     io_u->offset, io_u->xfer_buflen,
                                     spdk_fio_completion_cb, fio_req);
                break;
        default:
                assert(false);
                break;
        }

        if (rc == -ENOMEM) {
                return FIO_Q_BUSY;
        }

        if (rc != 0) {
                fio_req->io->error = abs(rc);
                return FIO_Q_COMPLETED;
        }

        return FIO_Q_QUEUED;
}

static struct io_u *
spdk_fio_event(struct thread_data *td, int event)
{
        struct spdk_fio_thread *fio_thread = td->io_ops_data;

        assert(event >= 0);
        assert((unsigned)event < fio_thread->iocq_count);
        return fio_thread->iocq[event];
}

static size_t
spdk_fio_poll_thread(struct spdk_fio_thread *fio_thread)
{
        return spdk_thread_poll(fio_thread->thread, 0, 0);
}

static int
spdk_fio_getevents(struct thread_data *td, unsigned int min,
                   unsigned int max, const struct timespec *t)
{
        struct spdk_fio_thread *fio_thread = td->io_ops_data;
        struct timespec t0, t1;
        uint64_t timeout = 0;

        if (t) {
                timeout = t->tv_sec * SPDK_SEC_TO_NSEC + t->tv_nsec;
                clock_gettime(CLOCK_MONOTONIC_RAW, &t0);
        }

        fio_thread->iocq_count = 0;

        for (;;) {
                spdk_fio_poll_thread(fio_thread);

                if (fio_thread->iocq_count >= min) {
                        return fio_thread->iocq_count;
                }

                if (t) {
                        clock_gettime(CLOCK_MONOTONIC_RAW, &t1);
                        uint64_t elapse = ((t1.tv_sec - t0.tv_sec) * SPDK_SEC_TO_NSEC)
                                          + t1.tv_nsec - t0.tv_nsec;
                        if (elapse > timeout) {
                                break;
                        }
                }
        }

        return fio_thread->iocq_count;
}

static int
spdk_fio_invalidate(struct thread_data *td, struct fio_file *f)
{
        /* TODO: This should probably send a flush to the device, but for now just return successful. */
        return 0;
}

static struct fio_option options[] = {
        {
                .name           = "spdk_conf",
                .lname          = "SPDK configuration file",
                .type           = FIO_OPT_STR_STORE,
                .off1           = offsetof(struct spdk_fio_options, conf),
                .help           = "A SPDK configuration file",
                .category       = FIO_OPT_C_ENGINE,
                .group          = FIO_OPT_G_INVALID,
        },
        {
                .name           = "spdk_json_conf",
                .lname          = "SPDK JSON configuration file",
                .type           = FIO_OPT_STR_STORE,
                .off1           = offsetof(struct spdk_fio_options, json_conf),
                .help           = "A SPDK JSON configuration file",
                .category       = FIO_OPT_C_ENGINE,
                .group          = FIO_OPT_G_INVALID,
        },
        {
                .name           = "spdk_mem",
                .lname          = "SPDK memory in MB",
                .type           = FIO_OPT_INT,
                .off1           = offsetof(struct spdk_fio_options, mem_mb),
                .help           = "Amount of memory in MB to allocate for SPDK",
                .category       = FIO_OPT_C_ENGINE,
                .group          = FIO_OPT_G_INVALID,
        },
        {
                .name           = "spdk_single_seg",
                .lname          = "SPDK switch to create just a single hugetlbfs file",
                .type           = FIO_OPT_BOOL,
                .off1           = offsetof(struct spdk_fio_options, mem_single_seg),
                .help           = "If set to 1, SPDK will use just a single hugetlbfs file",
                .category       = FIO_OPT_C_ENGINE,
                .group          = FIO_OPT_G_INVALID,
        },
        {
                .name           = NULL,
        },
};

/* FIO imports this structure using dlsym */
struct ioengine_ops ioengine = {
        .name                   = "spdk_bdev",
        .version                = FIO_IOOPS_VERSION,
        .flags                  = FIO_RAWIO | FIO_NOEXTEND | FIO_NODISKUTIL | FIO_MEMALIGN,
        .setup                  = spdk_fio_setup,
        .init                   = spdk_fio_init,
        /* .prep                = unused, */
        .queue                  = spdk_fio_queue,
        /* .commit              = unused, */
        .getevents              = spdk_fio_getevents,
        .event                  = spdk_fio_event,
        /* .errdetails          = unused, */
        /* .cancel              = unused, */
        .cleanup                = spdk_fio_cleanup,
        .open_file              = spdk_fio_open,
        .close_file             = spdk_fio_close,
        .invalidate             = spdk_fio_invalidate,
        /* .unlink_file         = unused, */
        /* .get_file_size       = unused, */
        /* .terminate           = unused, */
        .iomem_alloc            = spdk_fio_iomem_alloc,
        .iomem_free             = spdk_fio_iomem_free,
        .io_u_init              = spdk_fio_io_u_init,
        .io_u_free              = spdk_fio_io_u_free,
        .option_struct_size     = sizeof(struct spdk_fio_options),
        .options                = options,
};

static void fio_init spdk_fio_register(void)
{
        register_ioengine(&ioengine);
}

static void
spdk_fio_finish_env(void)
{
        pthread_mutex_lock(&g_init_mtx);
        g_poll_loop = false;
        pthread_cond_signal(&g_init_cond);
        pthread_mutex_unlock(&g_init_mtx);
        pthread_join(g_init_thread_id, NULL);

        spdk_thread_lib_fini();
}

static void fio_exit spdk_fio_unregister(void)
{
        if (g_spdk_env_initialized) {
                spdk_fio_finish_env();
                g_spdk_env_initialized = false;
        }
        unregister_ioengine(&ioengine);
}