LCOV - code coverage report
Current view: top level - module/bdev/aio - bdev_aio.c (source / functions) Hit Total Coverage
Test: ut_cov_unit.info Lines: 0 434 0.0 %
Date: 2024-07-15 20:04:44 Functions: 0 45 0.0 %

          Line data    Source code
       1             : /*   SPDX-License-Identifier: BSD-3-Clause
       2             :  *   Copyright (C) 2017 Intel Corporation.
       3             :  *   All rights reserved.
       4             :  *   Copyright (c) 2022 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
       5             :  */
       6             : 
       7             : #include "bdev_aio.h"
       8             : 
       9             : #include "spdk/stdinc.h"
      10             : 
      11             : #include "spdk/barrier.h"
      12             : #include "spdk/bdev.h"
      13             : #include "spdk/bdev_module.h"
      14             : #include "spdk/env.h"
      15             : #include "spdk/fd.h"
      16             : #include "spdk/likely.h"
      17             : #include "spdk/thread.h"
      18             : #include "spdk/json.h"
      19             : #include "spdk/util.h"
      20             : #include "spdk/string.h"
      21             : 
      22             : #include "spdk/log.h"
      23             : 
      24             : #include <sys/eventfd.h>
      25             : 
      26             : #ifndef __FreeBSD__
      27             : #include <libaio.h>
      28             : #endif
      29             : 
      30             : struct bdev_aio_io_channel {
      31             :         uint64_t                                io_inflight;
      32             : #ifdef __FreeBSD__
      33             :         int                                     kqfd;
      34             : #else
      35             :         io_context_t                            io_ctx;
      36             : #endif
      37             :         struct bdev_aio_group_channel           *group_ch;
      38             :         TAILQ_ENTRY(bdev_aio_io_channel)        link;
      39             : };
      40             : 
      41             : struct bdev_aio_group_channel {
      42             :         /* eventfd for io completion notification in interrupt mode.
      43             :          * Negative value like '-1' indicates it is invalid or unused.
      44             :          */
      45             :         int                                     efd;
      46             :         struct spdk_interrupt                   *intr;
      47             :         struct spdk_poller                      *poller;
      48             :         TAILQ_HEAD(, bdev_aio_io_channel)       io_ch_head;
      49             : };
      50             : 
      51             : struct bdev_aio_task {
      52             : #ifdef __FreeBSD__
      53             :         struct aiocb                    aiocb;
      54             : #else
      55             :         struct iocb                     iocb;
      56             : #endif
      57             :         uint64_t                        len;
      58             :         struct bdev_aio_io_channel      *ch;
      59             : };
      60             : 
      61             : struct file_disk {
      62             :         struct bdev_aio_task    *reset_task;
      63             :         struct spdk_poller      *reset_retry_timer;
      64             :         struct spdk_bdev        disk;
      65             :         char                    *filename;
      66             :         int                     fd;
      67             :         TAILQ_ENTRY(file_disk)  link;
      68             :         bool                    block_size_override;
      69             :         bool                    readonly;
      70             :         bool                    fallocate;
      71             : };
      72             : 
      73             : /* For user space reaping of completions */
      74             : struct spdk_aio_ring {
      75             :         uint32_t id;
      76             :         uint32_t size;
      77             :         uint32_t head;
      78             :         uint32_t tail;
      79             : 
      80             :         uint32_t version;
      81             :         uint32_t compat_features;
      82             :         uint32_t incompat_features;
      83             :         uint32_t header_length;
      84             : };
      85             : 
      86             : #define SPDK_AIO_RING_VERSION   0xa10a10a1
      87             : 
      88             : static int bdev_aio_initialize(void);
      89             : static void bdev_aio_fini(void);
      90             : static void aio_free_disk(struct file_disk *fdisk);
      91             : static TAILQ_HEAD(, file_disk) g_aio_disk_head = TAILQ_HEAD_INITIALIZER(g_aio_disk_head);
      92             : 
      93             : #define SPDK_AIO_QUEUE_DEPTH 128
      94             : #define MAX_EVENTS_PER_POLL 32
      95             : 
      96             : static int
      97           0 : bdev_aio_get_ctx_size(void)
      98             : {
      99           0 :         return sizeof(struct bdev_aio_task);
     100             : }
     101             : 
     102             : static struct spdk_bdev_module aio_if = {
     103             :         .name           = "aio",
     104             :         .module_init    = bdev_aio_initialize,
     105             :         .module_fini    = bdev_aio_fini,
     106             :         .get_ctx_size   = bdev_aio_get_ctx_size,
     107             : };
     108             : 
     109           0 : SPDK_BDEV_MODULE_REGISTER(aio, &aio_if)
     110             : 
     111             : static int
     112           0 : bdev_aio_open(struct file_disk *disk)
     113             : {
     114             :         int fd;
     115           0 :         int io_flag = disk->readonly ? O_RDONLY : O_RDWR;
     116             : 
     117           0 :         fd = open(disk->filename, io_flag | O_DIRECT);
     118           0 :         if (fd < 0) {
     119             :                 /* Try without O_DIRECT for non-disk files */
     120           0 :                 fd = open(disk->filename, io_flag);
     121           0 :                 if (fd < 0) {
     122           0 :                         SPDK_ERRLOG("open() failed (file:%s), errno %d: %s\n",
     123             :                                     disk->filename, errno, spdk_strerror(errno));
     124           0 :                         disk->fd = -1;
     125           0 :                         return -1;
     126             :                 }
     127             :         }
     128             : 
     129           0 :         disk->fd = fd;
     130             : 
     131           0 :         return 0;
     132             : }
     133             : 
     134             : static int
     135           0 : bdev_aio_close(struct file_disk *disk)
     136             : {
     137             :         int rc;
     138             : 
     139           0 :         if (disk->fd == -1) {
     140           0 :                 return 0;
     141             :         }
     142             : 
     143           0 :         rc = close(disk->fd);
     144           0 :         if (rc < 0) {
     145           0 :                 SPDK_ERRLOG("close() failed (fd=%d), errno %d: %s\n",
     146             :                             disk->fd, errno, spdk_strerror(errno));
     147           0 :                 return -1;
     148             :         }
     149             : 
     150           0 :         disk->fd = -1;
     151             : 
     152           0 :         return 0;
     153             : }
     154             : 
     155             : #ifdef __FreeBSD__
     156             : static int
     157             : bdev_aio_submit_io(enum spdk_bdev_io_type type, struct file_disk *fdisk,
     158             :                    struct spdk_io_channel *ch, struct bdev_aio_task *aio_task,
     159             :                    struct iovec *iov, int iovcnt, uint64_t nbytes, uint64_t offset)
     160             : {
     161             :         struct aiocb *aiocb = &aio_task->aiocb;
     162             :         struct bdev_aio_io_channel *aio_ch = spdk_io_channel_get_ctx(ch);
     163             : 
     164             :         memset(aiocb, 0, sizeof(struct aiocb));
     165             :         aiocb->aio_fildes = fdisk->fd;
     166             :         aiocb->aio_iov = iov;
     167             :         aiocb->aio_iovcnt = iovcnt;
     168             :         aiocb->aio_offset = offset;
     169             :         aiocb->aio_sigevent.sigev_notify_kqueue = aio_ch->kqfd;
     170             :         aiocb->aio_sigevent.sigev_value.sival_ptr = aio_task;
     171             :         aiocb->aio_sigevent.sigev_notify = SIGEV_KEVENT;
     172             : 
     173             :         aio_task->len = nbytes;
     174             :         aio_task->ch = aio_ch;
     175             : 
     176             :         if (type == SPDK_BDEV_IO_TYPE_READ) {
     177             :                 return aio_readv(aiocb);
     178             :         }
     179             : 
     180             :         return aio_writev(aiocb);
     181             : }
     182             : #else
     183             : static int
     184           0 : bdev_aio_submit_io(enum spdk_bdev_io_type type, struct file_disk *fdisk,
     185             :                    struct spdk_io_channel *ch, struct bdev_aio_task *aio_task,
     186             :                    struct iovec *iov, int iovcnt, uint64_t nbytes, uint64_t offset)
     187             : {
     188           0 :         struct iocb *iocb = &aio_task->iocb;
     189           0 :         struct bdev_aio_io_channel *aio_ch = spdk_io_channel_get_ctx(ch);
     190             : 
     191           0 :         if (type == SPDK_BDEV_IO_TYPE_READ) {
     192           0 :                 io_prep_preadv(iocb, fdisk->fd, iov, iovcnt, offset);
     193             :         } else {
     194           0 :                 io_prep_pwritev(iocb, fdisk->fd, iov, iovcnt, offset);
     195             :         }
     196             : 
     197           0 :         if (aio_ch->group_ch->efd >= 0) {
     198           0 :                 io_set_eventfd(iocb, aio_ch->group_ch->efd);
     199             :         }
     200           0 :         iocb->data = aio_task;
     201           0 :         aio_task->len = nbytes;
     202           0 :         aio_task->ch = aio_ch;
     203             : 
     204           0 :         return io_submit(aio_ch->io_ctx, 1, &iocb);
     205             : }
     206             : #endif
     207             : 
     208             : static void
     209           0 : bdev_aio_rw(enum spdk_bdev_io_type type, struct file_disk *fdisk,
     210             :             struct spdk_io_channel *ch, struct bdev_aio_task *aio_task,
     211             :             struct iovec *iov, int iovcnt, uint64_t nbytes, uint64_t offset)
     212             : {
     213           0 :         struct bdev_aio_io_channel *aio_ch = spdk_io_channel_get_ctx(ch);
     214             :         int rc;
     215             : 
     216           0 :         if (type == SPDK_BDEV_IO_TYPE_READ) {
     217           0 :                 SPDK_DEBUGLOG(aio, "read %d iovs size %lu to off: %#lx\n",
     218             :                               iovcnt, nbytes, offset);
     219             :         } else {
     220           0 :                 SPDK_DEBUGLOG(aio, "write %d iovs size %lu from off: %#lx\n",
     221             :                               iovcnt, nbytes, offset);
     222             :         }
     223             : 
     224           0 :         rc = bdev_aio_submit_io(type, fdisk, ch, aio_task, iov, iovcnt, nbytes, offset);
     225           0 :         if (spdk_unlikely(rc < 0)) {
     226           0 :                 if (rc == -EAGAIN) {
     227           0 :                         spdk_bdev_io_complete(spdk_bdev_io_from_ctx(aio_task), SPDK_BDEV_IO_STATUS_NOMEM);
     228             :                 } else {
     229           0 :                         spdk_bdev_io_complete_aio_status(spdk_bdev_io_from_ctx(aio_task), rc);
     230           0 :                         SPDK_ERRLOG("%s: io_submit returned %d\n", __func__, rc);
     231             :                 }
     232             :         } else {
     233           0 :                 aio_ch->io_inflight++;
     234             :         }
     235           0 : }
     236             : 
     237             : static void
     238           0 : bdev_aio_flush(struct file_disk *fdisk, struct bdev_aio_task *aio_task)
     239             : {
     240           0 :         int rc = fsync(fdisk->fd);
     241             : 
     242           0 :         if (rc == 0) {
     243           0 :                 spdk_bdev_io_complete(spdk_bdev_io_from_ctx(aio_task), SPDK_BDEV_IO_STATUS_SUCCESS);
     244             :         } else {
     245           0 :                 spdk_bdev_io_complete_aio_status(spdk_bdev_io_from_ctx(aio_task), -errno);
     246             :         }
     247           0 : }
     248             : 
     249             : #ifndef __FreeBSD__
     250             : static void
     251           0 : bdev_aio_fallocate(struct spdk_bdev_io *bdev_io, int mode)
     252             : {
     253           0 :         struct file_disk *fdisk = (struct file_disk *)bdev_io->bdev->ctxt;
     254           0 :         struct bdev_aio_task *aio_task = (struct bdev_aio_task *)bdev_io->driver_ctx;
     255           0 :         uint64_t offset_bytes = bdev_io->u.bdev.offset_blocks * bdev_io->bdev->blocklen;
     256           0 :         uint64_t length_bytes = bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen;
     257             :         int rc;
     258             : 
     259           0 :         if (!fdisk->fallocate) {
     260           0 :                 spdk_bdev_io_complete_aio_status(spdk_bdev_io_from_ctx(aio_task), -ENOTSUP);
     261           0 :                 return;
     262             :         }
     263             : 
     264           0 :         rc = fallocate(fdisk->fd, mode, offset_bytes, length_bytes);
     265           0 :         if (rc == 0) {
     266           0 :                 spdk_bdev_io_complete(spdk_bdev_io_from_ctx(aio_task), SPDK_BDEV_IO_STATUS_SUCCESS);
     267             :         } else {
     268           0 :                 spdk_bdev_io_complete_aio_status(spdk_bdev_io_from_ctx(aio_task), -errno);
     269             :         }
     270             : }
     271             : 
     272             : static void
     273           0 : bdev_aio_unmap(struct spdk_bdev_io *bdev_io)
     274             : {
     275           0 :         int mode = FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE;
     276             : 
     277           0 :         bdev_aio_fallocate(bdev_io, mode);
     278           0 : }
     279             : 
     280             : 
     281             : static void
     282           0 : bdev_aio_write_zeros(struct spdk_bdev_io *bdev_io)
     283             : {
     284           0 :         int mode = FALLOC_FL_ZERO_RANGE;
     285             : 
     286           0 :         bdev_aio_fallocate(bdev_io, mode);
     287           0 : }
     288             : #endif
     289             : 
     290             : static void
     291           0 : bdev_aio_destruct_cb(void *io_device)
     292             : {
     293           0 :         struct file_disk *fdisk = io_device;
     294           0 :         int rc = 0;
     295             : 
     296           0 :         TAILQ_REMOVE(&g_aio_disk_head, fdisk, link);
     297           0 :         rc = bdev_aio_close(fdisk);
     298           0 :         if (rc < 0) {
     299           0 :                 SPDK_ERRLOG("bdev_aio_close() failed\n");
     300             :         }
     301           0 :         aio_free_disk(fdisk);
     302           0 : }
     303             : 
     304             : static int
     305           0 : bdev_aio_destruct(void *ctx)
     306             : {
     307           0 :         struct file_disk *fdisk = ctx;
     308             : 
     309           0 :         spdk_io_device_unregister(fdisk, bdev_aio_destruct_cb);
     310             : 
     311           0 :         return 0;
     312             : }
     313             : 
     314             : #ifdef __FreeBSD__
     315             : static int
     316             : bdev_user_io_getevents(int kq, unsigned int max, struct kevent *events)
     317             : {
     318             :         struct timespec ts;
     319             :         int count;
     320             : 
     321             :         memset(events, 0, max * sizeof(struct kevent));
     322             :         memset(&ts, 0, sizeof(ts));
     323             : 
     324             :         count = kevent(kq, NULL, 0, events, max, &ts);
     325             :         if (count < 0) {
     326             :                 SPDK_ERRLOG("failed to get kevents: %s.\n", spdk_strerror(errno));
     327             :                 return -errno;
     328             :         }
     329             : 
     330             :         return count;
     331             : }
     332             : 
     333             : static int
     334             : bdev_aio_io_channel_poll(struct bdev_aio_io_channel *io_ch)
     335             : {
     336             :         int nr, i, res = 0;
     337             :         struct bdev_aio_task *aio_task;
     338             :         struct kevent events[SPDK_AIO_QUEUE_DEPTH];
     339             : 
     340             :         nr = bdev_user_io_getevents(io_ch->kqfd, SPDK_AIO_QUEUE_DEPTH, events);
     341             :         if (nr < 0) {
     342             :                 return 0;
     343             :         }
     344             : 
     345             :         for (i = 0; i < nr; i++) {
     346             :                 aio_task = events[i].udata;
     347             :                 aio_task->ch->io_inflight--;
     348             :                 if (aio_task == NULL) {
     349             :                         spdk_bdev_io_complete(spdk_bdev_io_from_ctx(aio_task), SPDK_BDEV_IO_STATUS_FAILED);
     350             :                         break;
     351             :                 } else if ((uint64_t)aio_return(&aio_task->aiocb) == aio_task->len) {
     352             :                         spdk_bdev_io_complete(spdk_bdev_io_from_ctx(aio_task), SPDK_BDEV_IO_STATUS_SUCCESS);
     353             :                 } else {
     354             :                         SPDK_ERRLOG("failed to complete aio: rc %d\n", aio_error(&aio_task->aiocb));
     355             :                         res = aio_error(&aio_task->aiocb);
     356             :                         if (res != 0) {
     357             :                                 spdk_bdev_io_complete_aio_status(spdk_bdev_io_from_ctx(aio_task), res);
     358             :                         } else {
     359             :                                 spdk_bdev_io_complete(spdk_bdev_io_from_ctx(aio_task), SPDK_BDEV_IO_STATUS_FAILED);
     360             :                         }
     361             :                 }
     362             :         }
     363             : 
     364             :         return nr;
     365             : }
     366             : #else
     367             : static int
     368           0 : bdev_user_io_getevents(io_context_t io_ctx, unsigned int max, struct io_event *uevents)
     369             : {
     370             :         uint32_t head, tail, count;
     371             :         struct spdk_aio_ring *ring;
     372           0 :         struct timespec timeout;
     373             :         struct io_event *kevents;
     374             : 
     375           0 :         ring = (struct spdk_aio_ring *)io_ctx;
     376             : 
     377           0 :         if (spdk_unlikely(ring->version != SPDK_AIO_RING_VERSION || ring->incompat_features != 0)) {
     378           0 :                 timeout.tv_sec = 0;
     379           0 :                 timeout.tv_nsec = 0;
     380             : 
     381           0 :                 return io_getevents(io_ctx, 0, max, uevents, &timeout);
     382             :         }
     383             : 
     384             :         /* Read the current state out of the ring */
     385           0 :         head = ring->head;
     386           0 :         tail = ring->tail;
     387             : 
     388             :         /* This memory barrier is required to prevent the loads above
     389             :          * from being re-ordered with stores to the events array
     390             :          * potentially occurring on other threads. */
     391           0 :         spdk_smp_rmb();
     392             : 
     393             :         /* Calculate how many items are in the circular ring */
     394           0 :         count = tail - head;
     395           0 :         if (tail < head) {
     396           0 :                 count += ring->size;
     397             :         }
     398             : 
     399             :         /* Reduce the count to the limit provided by the user */
     400           0 :         count = spdk_min(max, count);
     401             : 
     402             :         /* Grab the memory location of the event array */
     403           0 :         kevents = (struct io_event *)((uintptr_t)ring + ring->header_length);
     404             : 
     405             :         /* Copy the events out of the ring. */
     406           0 :         if ((head + count) <= ring->size) {
     407             :                 /* Only one copy is required */
     408           0 :                 memcpy(uevents, &kevents[head], count * sizeof(struct io_event));
     409             :         } else {
     410           0 :                 uint32_t first_part = ring->size - head;
     411             :                 /* Two copies are required */
     412           0 :                 memcpy(uevents, &kevents[head], first_part * sizeof(struct io_event));
     413           0 :                 memcpy(&uevents[first_part], &kevents[0], (count - first_part) * sizeof(struct io_event));
     414             :         }
     415             : 
     416             :         /* Update the head pointer. On x86, stores will not be reordered with older loads,
     417             :          * so the copies out of the event array will always be complete prior to this
     418             :          * update becoming visible. On other architectures this is not guaranteed, so
     419             :          * add a barrier. */
     420             : #if defined(__i386__) || defined(__x86_64__)
     421           0 :         spdk_compiler_barrier();
     422             : #else
     423             :         spdk_smp_mb();
     424             : #endif
     425           0 :         ring->head = (head + count) % ring->size;
     426             : 
     427           0 :         return count;
     428             : }
     429             : 
     430             : static int
     431           0 : bdev_aio_io_channel_poll(struct bdev_aio_io_channel *io_ch)
     432             : {
     433           0 :         int nr, i, res = 0;
     434             :         struct bdev_aio_task *aio_task;
     435           0 :         struct io_event events[SPDK_AIO_QUEUE_DEPTH];
     436             : 
     437           0 :         nr = bdev_user_io_getevents(io_ch->io_ctx, SPDK_AIO_QUEUE_DEPTH, events);
     438           0 :         if (nr < 0) {
     439           0 :                 return 0;
     440             :         }
     441             : 
     442           0 :         for (i = 0; i < nr; i++) {
     443           0 :                 aio_task = events[i].data;
     444           0 :                 aio_task->ch->io_inflight--;
     445           0 :                 if (events[i].res == aio_task->len) {
     446           0 :                         spdk_bdev_io_complete(spdk_bdev_io_from_ctx(aio_task), SPDK_BDEV_IO_STATUS_SUCCESS);
     447             :                 } else {
     448             :                         /* From aio_abi.h, io_event.res is defined __s64, negative errno
     449             :                          * will be assigned to io_event.res for error situation.
     450             :                          * But from libaio.h, io_event.res is defined unsigned long, so
     451             :                          * convert it to signed value for error detection.
     452             :                          */
     453           0 :                         SPDK_ERRLOG("failed to complete aio: rc %"PRId64"\n", events[i].res);
     454           0 :                         res = (int)events[i].res;
     455           0 :                         if (res < 0) {
     456           0 :                                 spdk_bdev_io_complete_aio_status(spdk_bdev_io_from_ctx(aio_task), res);
     457             :                         } else {
     458           0 :                                 spdk_bdev_io_complete(spdk_bdev_io_from_ctx(aio_task), SPDK_BDEV_IO_STATUS_FAILED);
     459             :                         }
     460             :                 }
     461             :         }
     462             : 
     463           0 :         return nr;
     464             : }
     465             : #endif
     466             : 
     467             : static int
     468           0 : bdev_aio_group_poll(void *arg)
     469             : {
     470           0 :         struct bdev_aio_group_channel *group_ch = arg;
     471             :         struct bdev_aio_io_channel *io_ch;
     472           0 :         int nr = 0;
     473             : 
     474           0 :         TAILQ_FOREACH(io_ch, &group_ch->io_ch_head, link) {
     475           0 :                 nr += bdev_aio_io_channel_poll(io_ch);
     476             :         }
     477             : 
     478           0 :         return nr > 0 ? SPDK_POLLER_BUSY : SPDK_POLLER_IDLE;
     479             : }
     480             : 
     481             : static int
     482           0 : bdev_aio_group_interrupt(void *arg)
     483             : {
     484           0 :         struct bdev_aio_group_channel *group_ch = arg;
     485             :         int rc;
     486           0 :         uint64_t num_events;
     487             : 
     488           0 :         assert(group_ch->efd >= 0);
     489             : 
     490             :         /* if completed IO number is larger than SPDK_AIO_QUEUE_DEPTH,
     491             :          * io_getevent should be called again to ensure all completed IO are processed.
     492             :          */
     493           0 :         rc = read(group_ch->efd, &num_events, sizeof(num_events));
     494           0 :         if (rc < 0) {
     495           0 :                 SPDK_ERRLOG("failed to acknowledge aio group: %s.\n", spdk_strerror(errno));
     496           0 :                 return -errno;
     497             :         }
     498             : 
     499           0 :         if (num_events > SPDK_AIO_QUEUE_DEPTH) {
     500           0 :                 num_events -= SPDK_AIO_QUEUE_DEPTH;
     501           0 :                 rc = write(group_ch->efd, &num_events, sizeof(num_events));
     502           0 :                 if (rc < 0) {
     503           0 :                         SPDK_ERRLOG("failed to notify aio group: %s.\n", spdk_strerror(errno));
     504             :                 }
     505             :         }
     506             : 
     507           0 :         return bdev_aio_group_poll(group_ch);
     508             : }
     509             : 
     510             : static void
     511           0 : _bdev_aio_get_io_inflight(struct spdk_io_channel_iter *i)
     512             : {
     513           0 :         struct spdk_io_channel *ch = spdk_io_channel_iter_get_channel(i);
     514           0 :         struct bdev_aio_io_channel *aio_ch = spdk_io_channel_get_ctx(ch);
     515             : 
     516           0 :         if (aio_ch->io_inflight) {
     517           0 :                 spdk_for_each_channel_continue(i, -1);
     518           0 :                 return;
     519             :         }
     520             : 
     521           0 :         spdk_for_each_channel_continue(i, 0);
     522             : }
     523             : 
     524             : static int bdev_aio_reset_retry_timer(void *arg);
     525             : 
     526             : static void
     527           0 : _bdev_aio_get_io_inflight_done(struct spdk_io_channel_iter *i, int status)
     528             : {
     529           0 :         struct file_disk *fdisk = spdk_io_channel_iter_get_ctx(i);
     530             : 
     531           0 :         if (status == -1) {
     532           0 :                 fdisk->reset_retry_timer = SPDK_POLLER_REGISTER(bdev_aio_reset_retry_timer, fdisk, 500);
     533           0 :                 return;
     534             :         }
     535             : 
     536           0 :         spdk_bdev_io_complete(spdk_bdev_io_from_ctx(fdisk->reset_task), SPDK_BDEV_IO_STATUS_SUCCESS);
     537             : }
     538             : 
     539             : static int
     540           0 : bdev_aio_reset_retry_timer(void *arg)
     541             : {
     542           0 :         struct file_disk *fdisk = arg;
     543             : 
     544           0 :         if (fdisk->reset_retry_timer) {
     545           0 :                 spdk_poller_unregister(&fdisk->reset_retry_timer);
     546             :         }
     547             : 
     548           0 :         spdk_for_each_channel(fdisk,
     549             :                               _bdev_aio_get_io_inflight,
     550             :                               fdisk,
     551             :                               _bdev_aio_get_io_inflight_done);
     552             : 
     553           0 :         return SPDK_POLLER_BUSY;
     554             : }
     555             : 
     556             : static void
     557           0 : bdev_aio_reset(struct file_disk *fdisk, struct bdev_aio_task *aio_task)
     558             : {
     559           0 :         fdisk->reset_task = aio_task;
     560             : 
     561           0 :         bdev_aio_reset_retry_timer(fdisk);
     562           0 : }
     563             : 
     564             : static void
     565           0 : bdev_aio_get_buf_cb(struct spdk_io_channel *ch, struct spdk_bdev_io *bdev_io,
     566             :                     bool success)
     567             : {
     568           0 :         if (!success) {
     569           0 :                 spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
     570           0 :                 return;
     571             :         }
     572             : 
     573           0 :         switch (bdev_io->type) {
     574           0 :         case SPDK_BDEV_IO_TYPE_READ:
     575             :         case SPDK_BDEV_IO_TYPE_WRITE:
     576           0 :                 bdev_aio_rw(bdev_io->type,
     577           0 :                             (struct file_disk *)bdev_io->bdev->ctxt,
     578             :                             ch,
     579           0 :                             (struct bdev_aio_task *)bdev_io->driver_ctx,
     580             :                             bdev_io->u.bdev.iovs,
     581             :                             bdev_io->u.bdev.iovcnt,
     582           0 :                             bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen,
     583           0 :                             bdev_io->u.bdev.offset_blocks * bdev_io->bdev->blocklen);
     584           0 :                 break;
     585           0 :         default:
     586           0 :                 SPDK_ERRLOG("Wrong io type\n");
     587           0 :                 break;
     588             :         }
     589             : }
     590             : 
     591             : static int
     592           0 : _bdev_aio_submit_request(struct spdk_io_channel *ch, struct spdk_bdev_io *bdev_io)
     593             : {
     594           0 :         struct file_disk *fdisk = (struct file_disk *)bdev_io->bdev->ctxt;
     595             : 
     596           0 :         switch (bdev_io->type) {
     597             :         /* Read and write operations must be performed on buffers aligned to
     598             :          * bdev->required_alignment. If user specified unaligned buffers,
     599             :          * get the aligned buffer from the pool by calling spdk_bdev_io_get_buf. */
     600           0 :         case SPDK_BDEV_IO_TYPE_READ:
     601           0 :                 spdk_bdev_io_get_buf(bdev_io, bdev_aio_get_buf_cb,
     602           0 :                                      bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen);
     603           0 :                 return 0;
     604           0 :         case SPDK_BDEV_IO_TYPE_WRITE:
     605           0 :                 if (fdisk->readonly) {
     606           0 :                         spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
     607             :                 } else {
     608           0 :                         spdk_bdev_io_get_buf(bdev_io, bdev_aio_get_buf_cb,
     609           0 :                                              bdev_io->u.bdev.num_blocks * bdev_io->bdev->blocklen);
     610             :                 }
     611           0 :                 return 0;
     612             : 
     613           0 :         case SPDK_BDEV_IO_TYPE_FLUSH:
     614           0 :                 bdev_aio_flush((struct file_disk *)bdev_io->bdev->ctxt,
     615           0 :                                (struct bdev_aio_task *)bdev_io->driver_ctx);
     616           0 :                 return 0;
     617             : 
     618           0 :         case SPDK_BDEV_IO_TYPE_RESET:
     619           0 :                 bdev_aio_reset((struct file_disk *)bdev_io->bdev->ctxt,
     620           0 :                                (struct bdev_aio_task *)bdev_io->driver_ctx);
     621           0 :                 return 0;
     622             : 
     623             : #ifndef __FreeBSD__
     624           0 :         case SPDK_BDEV_IO_TYPE_UNMAP:
     625           0 :                 bdev_aio_unmap(bdev_io);
     626           0 :                 return 0;
     627             : 
     628           0 :         case SPDK_BDEV_IO_TYPE_WRITE_ZEROES:
     629           0 :                 bdev_aio_write_zeros(bdev_io);
     630           0 :                 return 0;
     631             : #endif
     632             : 
     633           0 :         default:
     634           0 :                 return -1;
     635             :         }
     636             : }
     637             : 
     638             : static void
     639           0 : bdev_aio_submit_request(struct spdk_io_channel *ch, struct spdk_bdev_io *bdev_io)
     640             : {
     641           0 :         if (_bdev_aio_submit_request(ch, bdev_io) < 0) {
     642           0 :                 spdk_bdev_io_complete(bdev_io, SPDK_BDEV_IO_STATUS_FAILED);
     643             :         }
     644           0 : }
     645             : 
     646             : static bool
     647           0 : bdev_aio_io_type_supported(void *ctx, enum spdk_bdev_io_type io_type)
     648             : {
     649           0 :         struct file_disk *fdisk = ctx;
     650             : 
     651           0 :         switch (io_type) {
     652           0 :         case SPDK_BDEV_IO_TYPE_READ:
     653             :         case SPDK_BDEV_IO_TYPE_WRITE:
     654             :         case SPDK_BDEV_IO_TYPE_FLUSH:
     655             :         case SPDK_BDEV_IO_TYPE_RESET:
     656           0 :                 return true;
     657             : 
     658           0 :         case SPDK_BDEV_IO_TYPE_UNMAP:
     659             :         case SPDK_BDEV_IO_TYPE_WRITE_ZEROES:
     660           0 :                 return fdisk->fallocate;
     661             : 
     662           0 :         default:
     663           0 :                 return false;
     664             :         }
     665             : }
     666             : 
     667             : #ifdef __FreeBSD__
     668             : static int
     669             : bdev_aio_create_io(struct bdev_aio_io_channel *ch)
     670             : {
     671             :         ch->kqfd = kqueue();
     672             :         if (ch->kqfd < 0) {
     673             :                 SPDK_ERRLOG("async I/O context setup failure: %s.\n", spdk_strerror(errno));
     674             :                 return -1;
     675             :         }
     676             : 
     677             :         return 0;
     678             : }
     679             : 
     680             : static void
     681             : bdev_aio_destroy_io(struct bdev_aio_io_channel *ch)
     682             : {
     683             :         close(ch->kqfd);
     684             : }
     685             : #else
     686             : static int
     687           0 : bdev_aio_create_io(struct bdev_aio_io_channel *ch)
     688             : {
     689           0 :         if (io_setup(SPDK_AIO_QUEUE_DEPTH, &ch->io_ctx) < 0) {
     690           0 :                 SPDK_ERRLOG("Async I/O context setup failure, likely due to exceeding kernel limit.\n");
     691           0 :                 SPDK_ERRLOG("This limit may be increased using 'sysctl -w fs.aio-max-nr'.\n");
     692           0 :                 return -1;
     693             :         }
     694             : 
     695           0 :         return 0;
     696             : }
     697             : 
     698             : static void
     699           0 : bdev_aio_destroy_io(struct bdev_aio_io_channel *ch)
     700             : {
     701           0 :         io_destroy(ch->io_ctx);
     702           0 : }
     703             : #endif
     704             : 
     705             : static int
     706           0 : bdev_aio_create_cb(void *io_device, void *ctx_buf)
     707             : {
     708           0 :         struct bdev_aio_io_channel *ch = ctx_buf;
     709             :         int rc;
     710             : 
     711           0 :         rc = bdev_aio_create_io(ch);
     712           0 :         if (rc < 0) {
     713           0 :                 return rc;
     714             :         }
     715             : 
     716           0 :         ch->group_ch = spdk_io_channel_get_ctx(spdk_get_io_channel(&aio_if));
     717           0 :         TAILQ_INSERT_TAIL(&ch->group_ch->io_ch_head, ch, link);
     718             : 
     719           0 :         return 0;
     720             : }
     721             : 
     722             : static void
     723           0 : bdev_aio_destroy_cb(void *io_device, void *ctx_buf)
     724             : {
     725           0 :         struct bdev_aio_io_channel *ch = ctx_buf;
     726             : 
     727           0 :         bdev_aio_destroy_io(ch);
     728             : 
     729           0 :         assert(ch->group_ch);
     730           0 :         TAILQ_REMOVE(&ch->group_ch->io_ch_head, ch, link);
     731             : 
     732           0 :         spdk_put_io_channel(spdk_io_channel_from_ctx(ch->group_ch));
     733           0 : }
     734             : 
     735             : static struct spdk_io_channel *
     736           0 : bdev_aio_get_io_channel(void *ctx)
     737             : {
     738           0 :         struct file_disk *fdisk = ctx;
     739             : 
     740           0 :         return spdk_get_io_channel(fdisk);
     741             : }
     742             : 
     743             : 
     744             : static int
     745           0 : bdev_aio_dump_info_json(void *ctx, struct spdk_json_write_ctx *w)
     746             : {
     747           0 :         struct file_disk *fdisk = ctx;
     748             : 
     749           0 :         spdk_json_write_named_object_begin(w, "aio");
     750             : 
     751           0 :         spdk_json_write_named_string(w, "filename", fdisk->filename);
     752             : 
     753           0 :         spdk_json_write_named_bool(w, "block_size_override", fdisk->block_size_override);
     754             : 
     755           0 :         spdk_json_write_named_bool(w, "readonly", fdisk->readonly);
     756             : 
     757           0 :         spdk_json_write_named_bool(w, "fallocate", fdisk->fallocate);
     758             : 
     759           0 :         spdk_json_write_object_end(w);
     760             : 
     761           0 :         return 0;
     762             : }
     763             : 
     764             : static void
     765           0 : bdev_aio_write_json_config(struct spdk_bdev *bdev, struct spdk_json_write_ctx *w)
     766             : {
     767           0 :         struct file_disk *fdisk = bdev->ctxt;
     768             : 
     769           0 :         spdk_json_write_object_begin(w);
     770             : 
     771           0 :         spdk_json_write_named_string(w, "method", "bdev_aio_create");
     772             : 
     773           0 :         spdk_json_write_named_object_begin(w, "params");
     774           0 :         spdk_json_write_named_string(w, "name", bdev->name);
     775           0 :         if (fdisk->block_size_override) {
     776           0 :                 spdk_json_write_named_uint32(w, "block_size", bdev->blocklen);
     777             :         }
     778           0 :         spdk_json_write_named_string(w, "filename", fdisk->filename);
     779           0 :         spdk_json_write_named_bool(w, "readonly", fdisk->readonly);
     780           0 :         spdk_json_write_named_bool(w, "fallocate", fdisk->fallocate);
     781           0 :         spdk_json_write_object_end(w);
     782             : 
     783           0 :         spdk_json_write_object_end(w);
     784           0 : }
     785             : 
     786             : static const struct spdk_bdev_fn_table aio_fn_table = {
     787             :         .destruct               = bdev_aio_destruct,
     788             :         .submit_request         = bdev_aio_submit_request,
     789             :         .io_type_supported      = bdev_aio_io_type_supported,
     790             :         .get_io_channel         = bdev_aio_get_io_channel,
     791             :         .dump_info_json         = bdev_aio_dump_info_json,
     792             :         .write_config_json      = bdev_aio_write_json_config,
     793             : };
     794             : 
     795             : static void
     796           0 : aio_free_disk(struct file_disk *fdisk)
     797             : {
     798           0 :         if (fdisk == NULL) {
     799           0 :                 return;
     800             :         }
     801           0 :         free(fdisk->filename);
     802           0 :         free(fdisk->disk.name);
     803           0 :         free(fdisk);
     804             : }
     805             : 
     806             : static int
     807           0 : bdev_aio_register_interrupt(struct bdev_aio_group_channel *ch)
     808             : {
     809             :         int efd;
     810             : 
     811           0 :         efd = eventfd(0, EFD_NONBLOCK | EFD_CLOEXEC);
     812           0 :         if (efd < 0) {
     813           0 :                 return -1;
     814             :         }
     815             : 
     816           0 :         ch->intr = SPDK_INTERRUPT_REGISTER(efd, bdev_aio_group_interrupt, ch);
     817           0 :         if (ch->intr == NULL) {
     818           0 :                 close(efd);
     819           0 :                 return -1;
     820             :         }
     821           0 :         ch->efd = efd;
     822             : 
     823           0 :         return 0;
     824             : }
     825             : 
     826             : static void
     827           0 : bdev_aio_unregister_interrupt(struct bdev_aio_group_channel *ch)
     828             : {
     829           0 :         spdk_interrupt_unregister(&ch->intr);
     830           0 :         close(ch->efd);
     831           0 :         ch->efd = -1;
     832           0 : }
     833             : 
     834             : static void
     835           0 : bdev_aio_poller_set_interrupt_mode(struct spdk_poller *poller, void *cb_arg, bool interrupt_mode)
     836             : {
     837           0 :         return;
     838             : }
     839             : 
     840             : static int
     841           0 : bdev_aio_group_create_cb(void *io_device, void *ctx_buf)
     842             : {
     843           0 :         struct bdev_aio_group_channel *ch = ctx_buf;
     844             :         int rc;
     845             : 
     846           0 :         TAILQ_INIT(&ch->io_ch_head);
     847             :         /* Initialize ch->efd to be invalid and unused. */
     848           0 :         ch->efd = -1;
     849           0 :         if (spdk_interrupt_mode_is_enabled()) {
     850           0 :                 rc = bdev_aio_register_interrupt(ch);
     851           0 :                 if (rc < 0) {
     852           0 :                         SPDK_ERRLOG("Failed to prepare intr resource to bdev_aio\n");
     853           0 :                         return rc;
     854             :                 }
     855             :         }
     856             : 
     857           0 :         ch->poller = SPDK_POLLER_REGISTER(bdev_aio_group_poll, ch, 0);
     858           0 :         spdk_poller_register_interrupt(ch->poller, bdev_aio_poller_set_interrupt_mode, NULL);
     859             : 
     860           0 :         return 0;
     861             : }
     862             : 
     863             : static void
     864           0 : bdev_aio_group_destroy_cb(void *io_device, void *ctx_buf)
     865             : {
     866           0 :         struct bdev_aio_group_channel *ch = ctx_buf;
     867             : 
     868           0 :         if (!TAILQ_EMPTY(&ch->io_ch_head)) {
     869           0 :                 SPDK_ERRLOG("Group channel of bdev aio has uncleared io channel\n");
     870             :         }
     871             : 
     872           0 :         spdk_poller_unregister(&ch->poller);
     873           0 :         if (spdk_interrupt_mode_is_enabled()) {
     874           0 :                 bdev_aio_unregister_interrupt(ch);
     875             :         }
     876           0 : }
     877             : 
     878             : int
     879           0 : create_aio_bdev(const char *name, const char *filename, uint32_t block_size, bool readonly,
     880             :                 bool fallocate)
     881             : {
     882             :         struct file_disk *fdisk;
     883             :         uint32_t detected_block_size;
     884             :         uint64_t disk_size;
     885             :         int rc;
     886             : 
     887             : #ifdef __FreeBSD__
     888             :         if (fallocate) {
     889             :                 SPDK_ERRLOG("Unable to support fallocate on this platform\n");
     890             :                 return -ENOTSUP;
     891             :         }
     892             : #endif
     893             : 
     894           0 :         fdisk = calloc(1, sizeof(*fdisk));
     895           0 :         if (!fdisk) {
     896           0 :                 SPDK_ERRLOG("Unable to allocate enough memory for aio backend\n");
     897           0 :                 return -ENOMEM;
     898             :         }
     899           0 :         fdisk->readonly = readonly;
     900           0 :         fdisk->fallocate = fallocate;
     901             : 
     902           0 :         fdisk->filename = strdup(filename);
     903           0 :         if (!fdisk->filename) {
     904           0 :                 rc = -ENOMEM;
     905           0 :                 goto error_return;
     906             :         }
     907             : 
     908           0 :         if (bdev_aio_open(fdisk)) {
     909           0 :                 SPDK_ERRLOG("Unable to open file %s. fd: %d errno: %d\n", filename, fdisk->fd, errno);
     910           0 :                 rc = -errno;
     911           0 :                 goto error_return;
     912             :         }
     913             : 
     914           0 :         disk_size = spdk_fd_get_size(fdisk->fd);
     915             : 
     916           0 :         fdisk->disk.name = strdup(name);
     917           0 :         if (!fdisk->disk.name) {
     918           0 :                 rc = -ENOMEM;
     919           0 :                 goto error_return;
     920             :         }
     921           0 :         fdisk->disk.product_name = "AIO disk";
     922           0 :         fdisk->disk.module = &aio_if;
     923             : 
     924           0 :         fdisk->disk.write_cache = 1;
     925             : 
     926           0 :         detected_block_size = spdk_fd_get_blocklen(fdisk->fd);
     927           0 :         if (block_size == 0) {
     928             :                 /* User did not specify block size - use autodetected block size. */
     929           0 :                 if (detected_block_size == 0) {
     930           0 :                         SPDK_ERRLOG("Block size could not be auto-detected\n");
     931           0 :                         rc = -EINVAL;
     932           0 :                         goto error_return;
     933             :                 }
     934           0 :                 fdisk->block_size_override = false;
     935           0 :                 block_size = detected_block_size;
     936             :         } else {
     937           0 :                 if (block_size < detected_block_size) {
     938           0 :                         SPDK_ERRLOG("Specified block size %" PRIu32 " is smaller than "
     939             :                                     "auto-detected block size %" PRIu32 "\n",
     940             :                                     block_size, detected_block_size);
     941           0 :                         rc = -EINVAL;
     942           0 :                         goto error_return;
     943           0 :                 } else if (detected_block_size != 0 && block_size != detected_block_size) {
     944           0 :                         SPDK_WARNLOG("Specified block size %" PRIu32 " does not match "
     945             :                                      "auto-detected block size %" PRIu32 "\n",
     946             :                                      block_size, detected_block_size);
     947             :                 }
     948           0 :                 fdisk->block_size_override = true;
     949             :         }
     950             : 
     951           0 :         if (block_size < 512) {
     952           0 :                 SPDK_ERRLOG("Invalid block size %" PRIu32 " (must be at least 512).\n", block_size);
     953           0 :                 rc = -EINVAL;
     954           0 :                 goto error_return;
     955             :         }
     956             : 
     957           0 :         if (!spdk_u32_is_pow2(block_size)) {
     958           0 :                 SPDK_ERRLOG("Invalid block size %" PRIu32 " (must be a power of 2.)\n", block_size);
     959           0 :                 rc = -EINVAL;
     960           0 :                 goto error_return;
     961             :         }
     962             : 
     963           0 :         fdisk->disk.blocklen = block_size;
     964           0 :         if (fdisk->block_size_override && detected_block_size) {
     965           0 :                 fdisk->disk.required_alignment = spdk_u32log2(detected_block_size);
     966             :         } else {
     967           0 :                 fdisk->disk.required_alignment = spdk_u32log2(block_size);
     968             :         }
     969             : 
     970           0 :         if (disk_size % fdisk->disk.blocklen != 0) {
     971           0 :                 SPDK_ERRLOG("Disk size %" PRIu64 " is not a multiple of block size %" PRIu32 "\n",
     972             :                             disk_size, fdisk->disk.blocklen);
     973           0 :                 rc = -EINVAL;
     974           0 :                 goto error_return;
     975             :         }
     976             : 
     977           0 :         fdisk->disk.blockcnt = disk_size / fdisk->disk.blocklen;
     978           0 :         fdisk->disk.ctxt = fdisk;
     979             : 
     980           0 :         fdisk->disk.fn_table = &aio_fn_table;
     981             : 
     982           0 :         spdk_io_device_register(fdisk, bdev_aio_create_cb, bdev_aio_destroy_cb,
     983             :                                 sizeof(struct bdev_aio_io_channel),
     984           0 :                                 fdisk->disk.name);
     985           0 :         rc = spdk_bdev_register(&fdisk->disk);
     986           0 :         if (rc) {
     987           0 :                 spdk_io_device_unregister(fdisk, NULL);
     988           0 :                 goto error_return;
     989             :         }
     990             : 
     991           0 :         TAILQ_INSERT_TAIL(&g_aio_disk_head, fdisk, link);
     992           0 :         return 0;
     993             : 
     994           0 : error_return:
     995           0 :         bdev_aio_close(fdisk);
     996           0 :         aio_free_disk(fdisk);
     997           0 :         return rc;
     998             : }
     999             : 
    1000             : static void
    1001           0 : dummy_bdev_event_cb(enum spdk_bdev_event_type type, struct spdk_bdev *bdev, void *ctx)
    1002             : {
    1003           0 : }
    1004             : 
    1005             : int
    1006           0 : bdev_aio_rescan(const char *name)
    1007             : {
    1008           0 :         struct spdk_bdev_desc *desc;
    1009             :         struct spdk_bdev *bdev;
    1010             :         struct file_disk *fdisk;
    1011             :         uint64_t disk_size, blockcnt;
    1012             :         int rc;
    1013             : 
    1014           0 :         rc = spdk_bdev_open_ext(name, false, dummy_bdev_event_cb, NULL, &desc);
    1015           0 :         if (rc != 0) {
    1016           0 :                 return rc;
    1017             :         }
    1018             : 
    1019           0 :         bdev = spdk_bdev_desc_get_bdev(desc);
    1020           0 :         if (bdev->module != &aio_if) {
    1021           0 :                 rc = -ENODEV;
    1022           0 :                 goto exit;
    1023             :         }
    1024             : 
    1025           0 :         fdisk = SPDK_CONTAINEROF(bdev, struct file_disk, disk);
    1026           0 :         disk_size = spdk_fd_get_size(fdisk->fd);
    1027           0 :         blockcnt = disk_size / bdev->blocklen;
    1028             : 
    1029           0 :         if (bdev->blockcnt != blockcnt) {
    1030           0 :                 SPDK_NOTICELOG("AIO device is resized: bdev name %s, old block count %" PRIu64 ", new block count %"
    1031             :                                PRIu64 "\n",
    1032             :                                fdisk->filename,
    1033             :                                bdev->blockcnt,
    1034             :                                blockcnt);
    1035           0 :                 rc = spdk_bdev_notify_blockcnt_change(bdev, blockcnt);
    1036           0 :                 if (rc != 0) {
    1037           0 :                         SPDK_ERRLOG("Could not change num blocks for aio bdev: name %s, errno: %d.\n",
    1038             :                                     fdisk->filename, rc);
    1039           0 :                         goto exit;
    1040             :                 }
    1041             :         }
    1042             : 
    1043           0 : exit:
    1044           0 :         spdk_bdev_close(desc);
    1045           0 :         return rc;
    1046             : }
    1047             : 
    1048             : struct delete_aio_bdev_ctx {
    1049             :         delete_aio_bdev_complete cb_fn;
    1050             :         void *cb_arg;
    1051             : };
    1052             : 
    1053             : static void
    1054           0 : aio_bdev_unregister_cb(void *arg, int bdeverrno)
    1055             : {
    1056           0 :         struct delete_aio_bdev_ctx *ctx = arg;
    1057             : 
    1058           0 :         ctx->cb_fn(ctx->cb_arg, bdeverrno);
    1059           0 :         free(ctx);
    1060           0 : }
    1061             : 
    1062             : void
    1063           0 : bdev_aio_delete(const char *name, delete_aio_bdev_complete cb_fn, void *cb_arg)
    1064             : {
    1065             :         struct delete_aio_bdev_ctx *ctx;
    1066             :         int rc;
    1067             : 
    1068           0 :         ctx = calloc(1, sizeof(*ctx));
    1069           0 :         if (ctx == NULL) {
    1070           0 :                 cb_fn(cb_arg, -ENOMEM);
    1071           0 :                 return;
    1072             :         }
    1073             : 
    1074           0 :         ctx->cb_fn = cb_fn;
    1075           0 :         ctx->cb_arg = cb_arg;
    1076           0 :         rc = spdk_bdev_unregister_by_name(name, &aio_if, aio_bdev_unregister_cb, ctx);
    1077           0 :         if (rc != 0) {
    1078           0 :                 aio_bdev_unregister_cb(ctx, rc);
    1079             :         }
    1080             : }
    1081             : 
    1082             : static int
    1083           0 : bdev_aio_initialize(void)
    1084             : {
    1085           0 :         spdk_io_device_register(&aio_if, bdev_aio_group_create_cb, bdev_aio_group_destroy_cb,
    1086             :                                 sizeof(struct bdev_aio_group_channel), "aio_module");
    1087             : 
    1088           0 :         return 0;
    1089             : }
    1090             : 
    1091             : static void
    1092           0 : bdev_aio_fini(void)
    1093             : {
    1094           0 :         spdk_io_device_unregister(&aio_if, NULL);
    1095           0 : }
    1096             : 
    1097           0 : SPDK_LOG_REGISTER_COMPONENT(aio)

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