s3:registry: Initialize struct security_ace ace[]

[samba4-gss.git] / source3 / modules / vfs_io_uring.c

/*
 * Use the io_uring of Linux (>= 5.1)
 *
 * Copyright (C) Volker Lendecke 2008
 * Copyright (C) Jeremy Allison 2010
 * Copyright (C) Stefan Metzmacher 2019
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 */

#include "replace.h"

/*
 * liburing.h only needs a forward declaration
 * of struct open_how.
 *
 * If struct open_how is defined in liburing/compat.h
 * itself, hide it away in order to avoid conflicts
 * with including linux/openat2.h or defining 'struct open_how'
 * in libreplace.
 */
struct open_how;
#ifdef HAVE_STRUCT_OPEN_HOW_LIBURING_COMPAT_H
#define open_how __ignore_liburing_compat_h_open_how
#include <liburing/compat.h>
#undef open_how
#endif /* HAVE_STRUCT_OPEN_HOW_LIBURING_COMPAT_H */

#include "includes.h"
#include "system/filesys.h"
#include "smbd/smbd.h"
#include "smbd/globals.h"
#include "lib/util/tevent_unix.h"
#include "lib/util/sys_rw.h"
#include "lib/util/iov_buf.h"
#include "smbprofile.h"
#include <liburing.h>

struct vfs_io_uring_request;

struct vfs_io_uring_config {
        struct io_uring uring;
        struct tevent_fd *fde;
        /* recursion guard. See comment above vfs_io_uring_queue_run() */
        bool busy;
        /* recursion guard. See comment above vfs_io_uring_queue_run() */
        bool need_retry;
        struct vfs_io_uring_request *queue;
        struct vfs_io_uring_request *pending;
};

struct vfs_io_uring_request {
        struct vfs_io_uring_request *prev, *next;
        struct vfs_io_uring_request **list_head;
        struct vfs_io_uring_config *config;
        struct tevent_req *req;
        void (*completion_fn)(struct vfs_io_uring_request *cur,
                              const char *location);
        struct timespec start_time;
        struct timespec end_time;
        SMBPROFILE_BYTES_ASYNC_STATE(profile_bytes);
        struct io_uring_sqe sqe;
        struct io_uring_cqe cqe;
};

static void vfs_io_uring_finish_req(struct vfs_io_uring_request *cur,
                                    const struct io_uring_cqe *cqe,
                                    struct timespec end_time,
                                    const char *location)
{
        struct tevent_req *req =
                talloc_get_type_abort(cur->req,
                struct tevent_req);
        void *state = _tevent_req_data(req);

        talloc_set_destructor(state, NULL);
        if (cur->list_head != NULL) {
                DLIST_REMOVE((*cur->list_head), cur);
                cur->list_head = NULL;
        }
        cur->cqe = *cqe;

        SMBPROFILE_BYTES_ASYNC_SET_IDLE(cur->profile_bytes);
        cur->end_time = end_time;

        /*
         * We rely on being inside the _send() function
         * or tevent_req_defer_callback() being called
         * already.
         */
        cur->completion_fn(cur, location);
}

static void vfs_io_uring_config_destroy(struct vfs_io_uring_config *config,
                                        int ret,
                                        const char *location)
{
        struct vfs_io_uring_request *cur = NULL, *next = NULL;
        struct timespec start_time;
        struct timespec end_time;
        struct io_uring_cqe err_cqe = {
                .res = ret,
        };

        PROFILE_TIMESTAMP(&start_time);

        if (config->uring.ring_fd != -1) {
                /* TODO: cancel queued and pending requests */
                TALLOC_FREE(config->fde);
                io_uring_queue_exit(&config->uring);
                config->uring.ring_fd = -1;
        }

        PROFILE_TIMESTAMP(&end_time);

        for (cur = config->pending; cur != NULL; cur = next) {
                next = cur->next;
                err_cqe.user_data = (uintptr_t)(void *)cur;
                vfs_io_uring_finish_req(cur, &err_cqe, end_time, location);
        }

        for (cur = config->queue; cur != NULL; cur = next) {
                next = cur->next;
                err_cqe.user_data = (uintptr_t)(void *)cur;
                cur->start_time = start_time;
                vfs_io_uring_finish_req(cur, &err_cqe, end_time, location);
        }
}

static int vfs_io_uring_config_destructor(struct vfs_io_uring_config *config)
{
        vfs_io_uring_config_destroy(config, -EUCLEAN, __location__);
        return 0;
}

static int vfs_io_uring_request_state_deny_destructor(void *_state)
{
        struct __vfs_io_uring_generic_state {
                struct vfs_io_uring_request ur;
        } *state = (struct __vfs_io_uring_generic_state *)_state;
        struct vfs_io_uring_request *cur = &state->ur;

        /* our parent is gone */
        cur->req = NULL;

        /* remove ourself from any list */
        DLIST_REMOVE((*cur->list_head), cur);
        cur->list_head = NULL;

        /*
         * Our state is about to go away,
         * all we can do is shutting down the whole uring.
         * But that's ok as we're most likely called from exit_server()
         */
        vfs_io_uring_config_destroy(cur->config, -ESHUTDOWN, __location__);
        return 0;
}

static void vfs_io_uring_fd_handler(struct tevent_context *ev,
                                    struct tevent_fd *fde,
                                    uint16_t flags,
                                    void *private_data);

static int vfs_io_uring_connect(vfs_handle_struct *handle, const char *service,
                            const char *user)
{
        int ret;
        struct vfs_io_uring_config *config;
        unsigned num_entries;
        bool sqpoll;
        unsigned flags = 0;

        config = talloc_zero(handle->conn, struct vfs_io_uring_config);
        if (config == NULL) {
                DEBUG(0, ("talloc_zero() failed\n"));
                return -1;
        }

        SMB_VFS_HANDLE_SET_DATA(handle, config,
                                NULL, struct vfs_io_uring_config,
                                return -1);

        ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
        if (ret < 0) {
                return ret;
        }

        num_entries = lp_parm_ulong(SNUM(handle->conn),
                                    "io_uring",
                                    "num_entries",
                                    128);
        num_entries = MAX(num_entries, 1);

        sqpoll = lp_parm_bool(SNUM(handle->conn),
                             "io_uring",
                             "sqpoll",
                             false);
        if (sqpoll) {
                flags |= IORING_SETUP_SQPOLL;
        }

        ret = io_uring_queue_init(num_entries, &config->uring, flags);
        if (ret < 0) {
                SMB_VFS_NEXT_DISCONNECT(handle);
                errno = -ret;
                return -1;
        }

        talloc_set_destructor(config, vfs_io_uring_config_destructor);

#ifdef HAVE_IO_URING_RING_DONTFORK
        ret = io_uring_ring_dontfork(&config->uring);
        if (ret < 0) {
                SMB_VFS_NEXT_DISCONNECT(handle);
                errno = -ret;
                return -1;
        }
#endif /* HAVE_IO_URING_RING_DONTFORK */

        config->fde = tevent_add_fd(handle->conn->sconn->ev_ctx,
                                    config,
                                    config->uring.ring_fd,
                                    TEVENT_FD_READ,
                                    vfs_io_uring_fd_handler,
                                    handle);
        if (config->fde == NULL) {
                ret = errno;
                SMB_VFS_NEXT_DISCONNECT(handle);
                errno = ret;
                return -1;
        }

        return 0;
}

static void _vfs_io_uring_queue_run(struct vfs_io_uring_config *config)
{
        struct vfs_io_uring_request *cur = NULL, *next = NULL;
        struct io_uring_cqe *cqe = NULL;
        unsigned cqhead;
        unsigned nr = 0;
        struct timespec start_time;
        struct timespec end_time;
        int ret;

        PROFILE_TIMESTAMP(&start_time);

        if (config->uring.ring_fd == -1) {
                vfs_io_uring_config_destroy(config, -ESTALE, __location__);
                return;
        }

        for (cur = config->queue; cur != NULL; cur = next) {
                struct io_uring_sqe *sqe = NULL;
                void *state = _tevent_req_data(cur->req);

                next = cur->next;

                sqe = io_uring_get_sqe(&config->uring);
                if (sqe == NULL) {
                        break;
                }

                talloc_set_destructor(state,
                        vfs_io_uring_request_state_deny_destructor);
                DLIST_REMOVE(config->queue, cur);
                *sqe = cur->sqe;
                DLIST_ADD_END(config->pending, cur);
                cur->list_head = &config->pending;
                SMBPROFILE_BYTES_ASYNC_SET_BUSY(cur->profile_bytes);

                cur->start_time = start_time;
        }

        ret = io_uring_submit(&config->uring);
        if (ret == -EAGAIN || ret == -EBUSY) {
                /* We just retry later */
        } else if (ret < 0) {
                vfs_io_uring_config_destroy(config, ret, __location__);
                return;
        }

        PROFILE_TIMESTAMP(&end_time);

        io_uring_for_each_cqe(&config->uring, cqhead, cqe) {
                cur = (struct vfs_io_uring_request *)io_uring_cqe_get_data(cqe);
                vfs_io_uring_finish_req(cur, cqe, end_time, __location__);
                nr++;
        }

        io_uring_cq_advance(&config->uring, nr);
}

/*
 * Wrapper function to prevent recursion which could happen
 * if we called _vfs_io_uring_queue_run() directly without
 * recursion checks.
 *
 * Looking at the pread call, we can have:
 *
 * vfs_io_uring_pread_send()
 *        ->vfs_io_uring_pread_submit()  <-----------------------------------
 *                ->vfs_io_uring_request_submit()                           |
 *                        ->vfs_io_uring_queue_run()                        |
 *                                ->_vfs_io_uring_queue_run()               |
 *                                                                          |
 * But inside _vfs_io_uring_queue_run() looks like:                         |
 *                                                                          |
 * _vfs_io_uring_queue_run() {                                              |
 *      if (THIS_IO_COMPLETED) {                                            |
 *              ->vfs_io_uring_finish_req()                                 |
 *                      ->cur->completion_fn()                              |
 *      }                                                                   |
 * }                                                                        |
 *                                                                          |
 * cur->completion_fn() for pread is set to vfs_io_uring_pread_completion() |
 *                                                                          |
 * vfs_io_uring_pread_completion() {                                        |
 *      if (READ_TERMINATED) {                                              |
 *              -> tevent_req_done() - We're done, go back up the stack.    |
 *              return;                                                     |
 *      }                                                                   |
 *                                                                          |
 *      We have a short read - adjust the io vectors                        |
 *                                                                          |
 *      ->vfs_io_uring_pread_submit() ---------------------------------------
 * }
 *
 * So before calling _vfs_io_uring_queue_run() we backet it with setting
 * a flag config->busy, and unset it once _vfs_io_uring_queue_run() finally
 * exits the retry loop.
 *
 * If we end up back into vfs_io_uring_queue_run() we notice we've done so
 * as config->busy is set and don't recurse into _vfs_io_uring_queue_run().
 *
 * We set the second flag config->need_retry that tells us to loop in the
 * vfs_io_uring_queue_run() call above us in the stack and return.
 *
 * When the outer call to _vfs_io_uring_queue_run() returns we are in
 * a loop checking if config->need_retry was set. That happens if
 * the short read case occurs and _vfs_io_uring_queue_run() ended up
 * recursing into vfs_io_uring_queue_run().
 *
 * Once vfs_io_uring_pread_completion() finishes without a short
 * read (the READ_TERMINATED case, tevent_req_done() is called)
 * then config->need_retry is left as false, we exit the loop,
 * set config->busy to false so the next top level call into
 * vfs_io_uring_queue_run() won't think it's a recursed call
 * and return.
 *
 */

static void vfs_io_uring_queue_run(struct vfs_io_uring_config *config)
{
        if (config->busy) {
                /*
                 * We've recursed due to short read/write.
                 * Set need_retry to ensure we retry the
                 * io_uring_submit().
                 */
                config->need_retry = true;
                return;
        }

        /*
         * Bracket the loop calling _vfs_io_uring_queue_run()
         * with busy = true / busy = false.
         * so we can detect recursion above.
         */

        config->busy = true;

        do {
                config->need_retry = false;
                _vfs_io_uring_queue_run(config);
        } while (config->need_retry);

        config->busy = false;
}

static void vfs_io_uring_request_submit(struct vfs_io_uring_request *cur)
{
        struct vfs_io_uring_config *config = cur->config;

        io_uring_sqe_set_data(&cur->sqe, cur);
        DLIST_ADD_END(config->queue, cur);
        cur->list_head = &config->queue;

        vfs_io_uring_queue_run(config);
}

static void vfs_io_uring_fd_handler(struct tevent_context *ev,
                                    struct tevent_fd *fde,
                                    uint16_t flags,
                                    void *private_data)
{
        vfs_handle_struct *handle = (vfs_handle_struct *)private_data;
        struct vfs_io_uring_config *config = NULL;

        SMB_VFS_HANDLE_GET_DATA(handle, config,
                                struct vfs_io_uring_config,
                                smb_panic(__location__));

        vfs_io_uring_queue_run(config);
}

struct vfs_io_uring_pread_state {
        struct files_struct *fsp;
        off_t offset;
        struct iovec iov;
        size_t nread;
        struct vfs_io_uring_request ur;
};

static void vfs_io_uring_pread_submit(struct vfs_io_uring_pread_state *state);
static void vfs_io_uring_pread_completion(struct vfs_io_uring_request *cur,
                                          const char *location);

static struct tevent_req *vfs_io_uring_pread_send(struct vfs_handle_struct *handle,
                                             TALLOC_CTX *mem_ctx,
                                             struct tevent_context *ev,
                                             struct files_struct *fsp,
                                             void *data,
                                             size_t n, off_t offset)
{
        struct tevent_req *req = NULL;
        struct vfs_io_uring_pread_state *state = NULL;
        struct vfs_io_uring_config *config = NULL;
        bool ok;

        SMB_VFS_HANDLE_GET_DATA(handle, config,
                                struct vfs_io_uring_config,
                                smb_panic(__location__));

        req = tevent_req_create(mem_ctx, &state,
                                struct vfs_io_uring_pread_state);
        if (req == NULL) {
                return NULL;
        }
        state->ur.config = config;
        state->ur.req = req;
        state->ur.completion_fn = vfs_io_uring_pread_completion;

        SMBPROFILE_BYTES_ASYNC_START(syscall_asys_pread, profile_p,
                                     state->ur.profile_bytes, n);
        SMBPROFILE_BYTES_ASYNC_SET_IDLE(state->ur.profile_bytes);

        ok = sys_valid_io_range(offset, n);
        if (!ok) {
                tevent_req_error(req, EINVAL);
                return tevent_req_post(req, ev);
        }

        state->fsp = fsp;
        state->offset = offset;
        state->iov.iov_base = (void *)data;
        state->iov.iov_len = n;
        vfs_io_uring_pread_submit(state);

        if (!tevent_req_is_in_progress(req)) {
                return tevent_req_post(req, ev);
        }

        tevent_req_defer_callback(req, ev);
        return req;
}

static void vfs_io_uring_pread_submit(struct vfs_io_uring_pread_state *state)
{
        io_uring_prep_readv(&state->ur.sqe,
                            fsp_get_io_fd(state->fsp),
                            &state->iov, 1,
                            state->offset);
        vfs_io_uring_request_submit(&state->ur);
}

static void vfs_io_uring_pread_completion(struct vfs_io_uring_request *cur,
                                          const char *location)
{
        struct vfs_io_uring_pread_state *state = tevent_req_data(
                cur->req, struct vfs_io_uring_pread_state);
        struct iovec *iov = &state->iov;
        int num_iov = 1;
        bool ok;

        /*
         * We rely on being inside the _send() function
         * or tevent_req_defer_callback() being called
         * already.
         */

        if (cur->cqe.res < 0) {
                int err = -cur->cqe.res;
                _tevent_req_error(cur->req, err, location);
                return;
        }

        if (cur->cqe.res == 0) {
                /*
                 * We reached EOF, we're done
                 */
                tevent_req_done(cur->req);
                return;
        }

        ok = iov_advance(&iov, &num_iov, cur->cqe.res);
        if (!ok) {
                /* This is not expected! */
                DBG_ERR("iov_advance() failed cur->cqe.res=%d > iov_len=%d\n",
                        (int)cur->cqe.res,
                        (int)state->iov.iov_len);
                tevent_req_error(cur->req, EIO);
                return;
        }

        /* sys_valid_io_range() already checked the boundaries */
        state->nread += state->ur.cqe.res;
        if (num_iov == 0) {
                /* We're done */
                tevent_req_done(cur->req);
                return;
        }

        /*
         * sys_valid_io_range() already checked the boundaries
         * now try to get the rest.
         */
        state->offset += state->ur.cqe.res;
        vfs_io_uring_pread_submit(state);
}

static ssize_t vfs_io_uring_pread_recv(struct tevent_req *req,
                                  struct vfs_aio_state *vfs_aio_state)
{
        struct vfs_io_uring_pread_state *state = tevent_req_data(
                req, struct vfs_io_uring_pread_state);
        ssize_t ret;

        SMBPROFILE_BYTES_ASYNC_END(state->ur.profile_bytes);
        vfs_aio_state->duration = nsec_time_diff(&state->ur.end_time,
                                                 &state->ur.start_time);

        if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
                tevent_req_received(req);
                return -1;
        }

        vfs_aio_state->error = 0;
        ret = state->nread;

        tevent_req_received(req);
        return ret;
}

struct vfs_io_uring_pwrite_state {
        struct files_struct *fsp;
        off_t offset;
        struct iovec iov;
        size_t nwritten;
        struct vfs_io_uring_request ur;
};

static void vfs_io_uring_pwrite_submit(struct vfs_io_uring_pwrite_state *state);
static void vfs_io_uring_pwrite_completion(struct vfs_io_uring_request *cur,
                                           const char *location);

static struct tevent_req *vfs_io_uring_pwrite_send(struct vfs_handle_struct *handle,
                                              TALLOC_CTX *mem_ctx,
                                              struct tevent_context *ev,
                                              struct files_struct *fsp,
                                              const void *data,
                                              size_t n, off_t offset)
{
        struct tevent_req *req = NULL;
        struct vfs_io_uring_pwrite_state *state = NULL;
        struct vfs_io_uring_config *config = NULL;
        bool ok;

        SMB_VFS_HANDLE_GET_DATA(handle, config,
                                struct vfs_io_uring_config,
                                smb_panic(__location__));

        req = tevent_req_create(mem_ctx, &state,
                                struct vfs_io_uring_pwrite_state);
        if (req == NULL) {
                return NULL;
        }
        state->ur.config = config;
        state->ur.req = req;
        state->ur.completion_fn = vfs_io_uring_pwrite_completion;

        SMBPROFILE_BYTES_ASYNC_START(syscall_asys_pwrite, profile_p,
                                     state->ur.profile_bytes, n);
        SMBPROFILE_BYTES_ASYNC_SET_IDLE(state->ur.profile_bytes);

        ok = sys_valid_io_range(offset, n);
        if (!ok) {
                tevent_req_error(req, EINVAL);
                return tevent_req_post(req, ev);
        }

        state->fsp = fsp;
        state->offset = offset;
        state->iov.iov_base = discard_const(data);
        state->iov.iov_len = n;
        vfs_io_uring_pwrite_submit(state);

        if (!tevent_req_is_in_progress(req)) {
                return tevent_req_post(req, ev);
        }

        tevent_req_defer_callback(req, ev);
        return req;
}

static void vfs_io_uring_pwrite_submit(struct vfs_io_uring_pwrite_state *state)
{
        io_uring_prep_writev(&state->ur.sqe,
                             fsp_get_io_fd(state->fsp),
                             &state->iov, 1,
                             state->offset);
        vfs_io_uring_request_submit(&state->ur);
}

static void vfs_io_uring_pwrite_completion(struct vfs_io_uring_request *cur,
                                           const char *location)
{
        struct vfs_io_uring_pwrite_state *state = tevent_req_data(
                cur->req, struct vfs_io_uring_pwrite_state);
        struct iovec *iov = &state->iov;
        int num_iov = 1;
        bool ok;

        /*
         * We rely on being inside the _send() function
         * or tevent_req_defer_callback() being called
         * already.
         */

        if (cur->cqe.res < 0) {
                int err = -cur->cqe.res;
                _tevent_req_error(cur->req, err, location);
                return;
        }

        if (cur->cqe.res == 0) {
                /*
                 * Ensure we can never spin.
                 */
                tevent_req_error(cur->req, ENOSPC);
                return;
        }

        ok = iov_advance(&iov, &num_iov, cur->cqe.res);
        if (!ok) {
                /* This is not expected! */
                DBG_ERR("iov_advance() failed cur->cqe.res=%d > iov_len=%d\n",
                        (int)cur->cqe.res,
                        (int)state->iov.iov_len);
                tevent_req_error(cur->req, EIO);
                return;
        }

        /* sys_valid_io_range() already checked the boundaries */
        state->nwritten += state->ur.cqe.res;
        if (num_iov == 0) {
                /* We're done */
                tevent_req_done(cur->req);
                return;
        }

        /*
         * sys_valid_io_range() already checked the boundaries
         * now try to write the rest.
         */
        state->offset += state->ur.cqe.res;
        vfs_io_uring_pwrite_submit(state);
}

static ssize_t vfs_io_uring_pwrite_recv(struct tevent_req *req,
                                   struct vfs_aio_state *vfs_aio_state)
{
        struct vfs_io_uring_pwrite_state *state = tevent_req_data(
                req, struct vfs_io_uring_pwrite_state);
        ssize_t ret;

        SMBPROFILE_BYTES_ASYNC_END(state->ur.profile_bytes);
        vfs_aio_state->duration = nsec_time_diff(&state->ur.end_time,
                                                 &state->ur.start_time);

        if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
                tevent_req_received(req);
                return -1;
        }

        vfs_aio_state->error = 0;
        ret = state->nwritten;

        tevent_req_received(req);
        return ret;
}

struct vfs_io_uring_fsync_state {
        struct vfs_io_uring_request ur;
};

static void vfs_io_uring_fsync_completion(struct vfs_io_uring_request *cur,
                                          const char *location);

static struct tevent_req *vfs_io_uring_fsync_send(struct vfs_handle_struct *handle,
                                             TALLOC_CTX *mem_ctx,
                                             struct tevent_context *ev,
                                             struct files_struct *fsp)
{
        struct tevent_req *req = NULL;
        struct vfs_io_uring_fsync_state *state = NULL;
        struct vfs_io_uring_config *config = NULL;

        SMB_VFS_HANDLE_GET_DATA(handle, config,
                                struct vfs_io_uring_config,
                                smb_panic(__location__));

        req = tevent_req_create(mem_ctx, &state,
                                struct vfs_io_uring_fsync_state);
        if (req == NULL) {
                return NULL;
        }
        state->ur.config = config;
        state->ur.req = req;
        state->ur.completion_fn = vfs_io_uring_fsync_completion;

        SMBPROFILE_BYTES_ASYNC_START(syscall_asys_fsync, profile_p,
                                     state->ur.profile_bytes, 0);
        SMBPROFILE_BYTES_ASYNC_SET_IDLE(state->ur.profile_bytes);

        io_uring_prep_fsync(&state->ur.sqe,
                            fsp_get_io_fd(fsp),
                            0); /* fsync_flags */
        vfs_io_uring_request_submit(&state->ur);

        if (!tevent_req_is_in_progress(req)) {
                return tevent_req_post(req, ev);
        }

        tevent_req_defer_callback(req, ev);
        return req;
}

static void vfs_io_uring_fsync_completion(struct vfs_io_uring_request *cur,
                                          const char *location)
{
        /*
         * We rely on being inside the _send() function
         * or tevent_req_defer_callback() being called
         * already.
         */

        if (cur->cqe.res < 0) {
                int err = -cur->cqe.res;
                _tevent_req_error(cur->req, err, location);
                return;
        }

        if (cur->cqe.res > 0) {
                /* This is not expected! */
                DBG_ERR("got cur->cqe.res=%d\n", (int)cur->cqe.res);
                tevent_req_error(cur->req, EIO);
                return;
        }

        tevent_req_done(cur->req);
}

static int vfs_io_uring_fsync_recv(struct tevent_req *req,
                              struct vfs_aio_state *vfs_aio_state)
{
        struct vfs_io_uring_fsync_state *state = tevent_req_data(
                req, struct vfs_io_uring_fsync_state);

        SMBPROFILE_BYTES_ASYNC_END(state->ur.profile_bytes);
        vfs_aio_state->duration = nsec_time_diff(&state->ur.end_time,
                                                 &state->ur.start_time);

        if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
                tevent_req_received(req);
                return -1;
        }

        vfs_aio_state->error = 0;

        tevent_req_received(req);
        return 0;
}

static struct vfs_fn_pointers vfs_io_uring_fns = {
        .connect_fn = vfs_io_uring_connect,
        .pread_send_fn = vfs_io_uring_pread_send,
        .pread_recv_fn = vfs_io_uring_pread_recv,
        .pwrite_send_fn = vfs_io_uring_pwrite_send,
        .pwrite_recv_fn = vfs_io_uring_pwrite_recv,
        .fsync_send_fn = vfs_io_uring_fsync_send,
        .fsync_recv_fn = vfs_io_uring_fsync_recv,
};

static_decl_vfs;
NTSTATUS vfs_io_uring_init(TALLOC_CTX *ctx)
{
        return smb_register_vfs(SMB_VFS_INTERFACE_VERSION,
                                "io_uring", &vfs_io_uring_fns);
}