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-rw-r--r--engines/libaio.c396
1 files changed, 0 insertions, 396 deletions
diff --git a/engines/libaio.c b/engines/libaio.c
deleted file mode 100644
index e15c519e..00000000
--- a/engines/libaio.c
+++ /dev/null
@@ -1,396 +0,0 @@
-/*
- * libaio engine
- *
- * IO engine using the Linux native aio interface.
- *
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <assert.h>
-#include <libaio.h>
-
-#include "../fio.h"
-#include "../lib/pow2.h"
-#include "../optgroup.h"
-
-static int fio_libaio_commit(struct thread_data *td);
-
-struct libaio_data {
- io_context_t aio_ctx;
- struct io_event *aio_events;
- struct iocb **iocbs;
- struct io_u **io_us;
-
- /*
- * Basic ring buffer. 'head' is incremented in _queue(), and
- * 'tail' is incremented in _commit(). We keep 'queued' so
- * that we know if the ring is full or empty, when
- * 'head' == 'tail'. 'entries' is the ring size, and
- * 'is_pow2' is just an optimization to use AND instead of
- * modulus to get the remainder on ring increment.
- */
- int is_pow2;
- unsigned int entries;
- unsigned int queued;
- unsigned int head;
- unsigned int tail;
-};
-
-struct libaio_options {
- void *pad;
- unsigned int userspace_reap;
-};
-
-static struct fio_option options[] = {
- {
- .name = "userspace_reap",
- .lname = "Libaio userspace reaping",
- .type = FIO_OPT_STR_SET,
- .off1 = offsetof(struct libaio_options, userspace_reap),
- .help = "Use alternative user-space reap implementation",
- .category = FIO_OPT_C_ENGINE,
- .group = FIO_OPT_G_LIBAIO,
- },
- {
- .name = NULL,
- },
-};
-
-static inline void ring_inc(struct libaio_data *ld, unsigned int *val,
- unsigned int add)
-{
- if (ld->is_pow2)
- *val = (*val + add) & (ld->entries - 1);
- else
- *val = (*val + add) % ld->entries;
-}
-
-static int fio_libaio_prep(struct thread_data fio_unused *td, struct io_u *io_u)
-{
- struct fio_file *f = io_u->file;
-
- if (io_u->ddir == DDIR_READ)
- io_prep_pread(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
- else if (io_u->ddir == DDIR_WRITE)
- io_prep_pwrite(&io_u->iocb, f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
- else if (ddir_sync(io_u->ddir))
- io_prep_fsync(&io_u->iocb, f->fd);
-
- return 0;
-}
-
-static struct io_u *fio_libaio_event(struct thread_data *td, int event)
-{
- struct libaio_data *ld = td->io_ops_data;
- struct io_event *ev;
- struct io_u *io_u;
-
- ev = ld->aio_events + event;
- io_u = container_of(ev->obj, struct io_u, iocb);
-
- if (ev->res != io_u->xfer_buflen) {
- if (ev->res > io_u->xfer_buflen)
- io_u->error = -ev->res;
- else
- io_u->resid = io_u->xfer_buflen - ev->res;
- } else
- io_u->error = 0;
-
- return io_u;
-}
-
-struct aio_ring {
- unsigned id; /** kernel internal index number */
- unsigned nr; /** number of io_events */
- unsigned head;
- unsigned tail;
-
- unsigned magic;
- unsigned compat_features;
- unsigned incompat_features;
- unsigned header_length; /** size of aio_ring */
-
- struct io_event events[0];
-};
-
-#define AIO_RING_MAGIC 0xa10a10a1
-
-static int user_io_getevents(io_context_t aio_ctx, unsigned int max,
- struct io_event *events)
-{
- long i = 0;
- unsigned head;
- struct aio_ring *ring = (struct aio_ring*) aio_ctx;
-
- while (i < max) {
- head = ring->head;
-
- if (head == ring->tail) {
- /* There are no more completions */
- break;
- } else {
- /* There is another completion to reap */
- events[i] = ring->events[head];
- read_barrier();
- ring->head = (head + 1) % ring->nr;
- i++;
- }
- }
-
- return i;
-}
-
-static int fio_libaio_getevents(struct thread_data *td, unsigned int min,
- unsigned int max, const struct timespec *t)
-{
- struct libaio_data *ld = td->io_ops_data;
- struct libaio_options *o = td->eo;
- unsigned actual_min = td->o.iodepth_batch_complete_min == 0 ? 0 : min;
- struct timespec __lt, *lt = NULL;
- int r, events = 0;
-
- if (t) {
- __lt = *t;
- lt = &__lt;
- }
-
- do {
- if (o->userspace_reap == 1
- && actual_min == 0
- && ((struct aio_ring *)(ld->aio_ctx))->magic
- == AIO_RING_MAGIC) {
- r = user_io_getevents(ld->aio_ctx, max,
- ld->aio_events + events);
- } else {
- r = io_getevents(ld->aio_ctx, actual_min,
- max, ld->aio_events + events, lt);
- }
- if (r > 0)
- events += r;
- else if ((min && r == 0) || r == -EAGAIN) {
- fio_libaio_commit(td);
- usleep(100);
- } else if (r != -EINTR)
- break;
- } while (events < min);
-
- return r < 0 ? r : events;
-}
-
-static int fio_libaio_queue(struct thread_data *td, struct io_u *io_u)
-{
- struct libaio_data *ld = td->io_ops_data;
-
- fio_ro_check(td, io_u);
-
- if (ld->queued == td->o.iodepth)
- return FIO_Q_BUSY;
-
- /*
- * fsync is tricky, since it can fail and we need to do it
- * serialized with other io. the reason is that linux doesn't
- * support aio fsync yet. So return busy for the case where we
- * have pending io, to let fio complete those first.
- */
- if (ddir_sync(io_u->ddir)) {
- if (ld->queued)
- return FIO_Q_BUSY;
-
- do_io_u_sync(td, io_u);
- return FIO_Q_COMPLETED;
- }
-
- if (io_u->ddir == DDIR_TRIM) {
- if (ld->queued)
- return FIO_Q_BUSY;
-
- do_io_u_trim(td, io_u);
- return FIO_Q_COMPLETED;
- }
-
- ld->iocbs[ld->head] = &io_u->iocb;
- ld->io_us[ld->head] = io_u;
- ring_inc(ld, &ld->head, 1);
- ld->queued++;
- return FIO_Q_QUEUED;
-}
-
-static void fio_libaio_queued(struct thread_data *td, struct io_u **io_us,
- unsigned int nr)
-{
- struct timeval now;
- unsigned int i;
-
- if (!fio_fill_issue_time(td))
- return;
-
- fio_gettime(&now, NULL);
-
- for (i = 0; i < nr; i++) {
- struct io_u *io_u = io_us[i];
-
- memcpy(&io_u->issue_time, &now, sizeof(now));
- io_u_queued(td, io_u);
- }
-}
-
-static int fio_libaio_commit(struct thread_data *td)
-{
- struct libaio_data *ld = td->io_ops_data;
- struct iocb **iocbs;
- struct io_u **io_us;
- struct timeval tv;
- int ret, wait_start = 0;
-
- if (!ld->queued)
- return 0;
-
- do {
- long nr = ld->queued;
-
- nr = min((unsigned int) nr, ld->entries - ld->tail);
- io_us = ld->io_us + ld->tail;
- iocbs = ld->iocbs + ld->tail;
-
- ret = io_submit(ld->aio_ctx, nr, iocbs);
- if (ret > 0) {
- fio_libaio_queued(td, io_us, ret);
- io_u_mark_submit(td, ret);
-
- ld->queued -= ret;
- ring_inc(ld, &ld->tail, ret);
- ret = 0;
- wait_start = 0;
- } else if (ret == -EINTR || !ret) {
- if (!ret)
- io_u_mark_submit(td, ret);
- wait_start = 0;
- continue;
- } else if (ret == -EAGAIN) {
- /*
- * If we get EAGAIN, we should break out without
- * error and let the upper layer reap some
- * events for us. If we have no queued IO, we
- * must loop here. If we loop for more than 30s,
- * just error out, something must be buggy in the
- * IO path.
- */
- if (ld->queued) {
- ret = 0;
- break;
- }
- if (!wait_start) {
- fio_gettime(&tv, NULL);
- wait_start = 1;
- } else if (mtime_since_now(&tv) > 30000) {
- log_err("fio: aio appears to be stalled, giving up\n");
- break;
- }
- usleep(1);
- continue;
- } else if (ret == -ENOMEM) {
- /*
- * If we get -ENOMEM, reap events if we can. If
- * we cannot, treat it as a fatal event since there's
- * nothing we can do about it.
- */
- if (ld->queued)
- ret = 0;
- break;
- } else
- break;
- } while (ld->queued);
-
- return ret;
-}
-
-static int fio_libaio_cancel(struct thread_data *td, struct io_u *io_u)
-{
- struct libaio_data *ld = td->io_ops_data;
-
- return io_cancel(ld->aio_ctx, &io_u->iocb, ld->aio_events);
-}
-
-static void fio_libaio_cleanup(struct thread_data *td)
-{
- struct libaio_data *ld = td->io_ops_data;
-
- if (ld) {
- /*
- * Work-around to avoid huge RCU stalls at exit time. If we
- * don't do this here, then it'll be torn down by exit_aio().
- * But for that case we can parallellize the freeing, thus
- * speeding it up a lot.
- */
- if (!(td->flags & TD_F_CHILD))
- io_destroy(ld->aio_ctx);
- free(ld->aio_events);
- free(ld->iocbs);
- free(ld->io_us);
- free(ld);
- }
-}
-
-static int fio_libaio_init(struct thread_data *td)
-{
- struct libaio_options *o = td->eo;
- struct libaio_data *ld;
- int err = 0;
-
- ld = calloc(1, sizeof(*ld));
-
- /*
- * First try passing in 0 for queue depth, since we don't
- * care about the user ring. If that fails, the kernel is too old
- * and we need the right depth.
- */
- if (!o->userspace_reap)
- err = io_queue_init(INT_MAX, &ld->aio_ctx);
- if (o->userspace_reap || err == -EINVAL)
- err = io_queue_init(td->o.iodepth, &ld->aio_ctx);
- if (err) {
- td_verror(td, -err, "io_queue_init");
- log_err("fio: check /proc/sys/fs/aio-max-nr\n");
- free(ld);
- return 1;
- }
-
- ld->entries = td->o.iodepth;
- ld->is_pow2 = is_power_of_2(ld->entries);
- ld->aio_events = calloc(ld->entries, sizeof(struct io_event));
- ld->iocbs = calloc(ld->entries, sizeof(struct iocb *));
- ld->io_us = calloc(ld->entries, sizeof(struct io_u *));
-
- td->io_ops_data = ld;
- return 0;
-}
-
-static struct ioengine_ops ioengine = {
- .name = "libaio",
- .version = FIO_IOOPS_VERSION,
- .init = fio_libaio_init,
- .prep = fio_libaio_prep,
- .queue = fio_libaio_queue,
- .commit = fio_libaio_commit,
- .cancel = fio_libaio_cancel,
- .getevents = fio_libaio_getevents,
- .event = fio_libaio_event,
- .cleanup = fio_libaio_cleanup,
- .open_file = generic_open_file,
- .close_file = generic_close_file,
- .get_file_size = generic_get_file_size,
- .options = options,
- .option_struct_size = sizeof(struct libaio_options),
-};
-
-static void fio_init fio_libaio_register(void)
-{
- register_ioengine(&ioengine);
-}
-
-static void fio_exit fio_libaio_unregister(void)
-{
- unregister_ioengine(&ioengine);
-}
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