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/*
* sync/psync engine
*
* IO engine that does regular read(2)/write(2) with lseek(2) to transfer
* data and IO engine that does regular pread(2)/pwrite(2) to transfer data.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/uio.h>
#include <errno.h>
#include <assert.h>
#include "../fio.h"
/*
* Sync engine uses engine_data to store last offset
*/
#define LAST_POS(f) ((f)->engine_data)
struct syncio_data {
struct iovec *iovecs;
struct io_u **io_us;
unsigned int queued;
unsigned int events;
unsigned long queued_bytes;
unsigned long long last_offset;
struct fio_file *last_file;
enum fio_ddir last_ddir;
};
static int fio_syncio_prep(struct thread_data *td, struct io_u *io_u)
{
struct fio_file *f = io_u->file;
if (!ddir_rw(io_u->ddir))
return 0;
if (LAST_POS(f) != -1ULL && LAST_POS(f) == io_u->offset)
return 0;
if (lseek(f->fd, io_u->offset, SEEK_SET) == -1) {
td_verror(td, errno, "lseek");
return 1;
}
return 0;
}
static int fio_io_end(struct thread_data *td, struct io_u *io_u, int ret)
{
if (io_u->file && ret >= 0 && ddir_rw(io_u->ddir))
LAST_POS(io_u->file) = io_u->offset + ret;
if (ret != (int) io_u->xfer_buflen) {
if (ret >= 0) {
io_u->resid = io_u->xfer_buflen - ret;
io_u->error = 0;
return FIO_Q_COMPLETED;
} else
io_u->error = errno;
}
if (io_u->error)
td_verror(td, io_u->error, "xfer");
return FIO_Q_COMPLETED;
}
#ifdef CONFIG_PWRITEV
static int fio_pvsyncio_queue(struct thread_data *td, struct io_u *io_u)
{
struct syncio_data *sd = td->io_ops->data;
struct iovec *iov = &sd->iovecs[0];
struct fio_file *f = io_u->file;
int ret;
fio_ro_check(td, io_u);
iov->iov_base = io_u->xfer_buf;
iov->iov_len = io_u->xfer_buflen;
if (io_u->ddir == DDIR_READ)
ret = preadv(f->fd, iov, 1, io_u->offset);
else if (io_u->ddir == DDIR_WRITE)
ret = pwritev(f->fd, iov, 1, io_u->offset);
else if (io_u->ddir == DDIR_TRIM) {
do_io_u_trim(td, io_u);
return FIO_Q_COMPLETED;
} else
ret = do_io_u_sync(td, io_u);
return fio_io_end(td, io_u, ret);
}
#endif
static int fio_psyncio_queue(struct thread_data *td, struct io_u *io_u)
{
struct fio_file *f = io_u->file;
int ret;
fio_ro_check(td, io_u);
if (io_u->ddir == DDIR_READ)
ret = pread(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
else if (io_u->ddir == DDIR_WRITE)
ret = pwrite(f->fd, io_u->xfer_buf, io_u->xfer_buflen, io_u->offset);
else if (io_u->ddir == DDIR_TRIM) {
do_io_u_trim(td, io_u);
return FIO_Q_COMPLETED;
} else
ret = do_io_u_sync(td, io_u);
return fio_io_end(td, io_u, ret);
}
static int fio_syncio_queue(struct thread_data *td, struct io_u *io_u)
{
struct fio_file *f = io_u->file;
int ret;
fio_ro_check(td, io_u);
if (io_u->ddir == DDIR_READ)
ret = read(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
else if (io_u->ddir == DDIR_WRITE)
ret = write(f->fd, io_u->xfer_buf, io_u->xfer_buflen);
else if (io_u->ddir == DDIR_TRIM) {
do_io_u_trim(td, io_u);
return FIO_Q_COMPLETED;
} else
ret = do_io_u_sync(td, io_u);
return fio_io_end(td, io_u, ret);
}
static int fio_vsyncio_getevents(struct thread_data *td, unsigned int min,
unsigned int max,
struct timespec fio_unused *t)
{
struct syncio_data *sd = td->io_ops->data;
int ret;
if (min) {
ret = sd->events;
sd->events = 0;
} else
ret = 0;
dprint(FD_IO, "vsyncio_getevents: min=%d,max=%d: %d\n", min, max, ret);
return ret;
}
static struct io_u *fio_vsyncio_event(struct thread_data *td, int event)
{
struct syncio_data *sd = td->io_ops->data;
return sd->io_us[event];
}
static int fio_vsyncio_append(struct thread_data *td, struct io_u *io_u)
{
struct syncio_data *sd = td->io_ops->data;
if (ddir_sync(io_u->ddir))
return 0;
if (io_u->offset == sd->last_offset && io_u->file == sd->last_file &&
io_u->ddir == sd->last_ddir)
return 1;
return 0;
}
static void fio_vsyncio_set_iov(struct syncio_data *sd, struct io_u *io_u,
int idx)
{
sd->io_us[idx] = io_u;
sd->iovecs[idx].iov_base = io_u->xfer_buf;
sd->iovecs[idx].iov_len = io_u->xfer_buflen;
sd->last_offset = io_u->offset + io_u->xfer_buflen;
sd->last_file = io_u->file;
sd->last_ddir = io_u->ddir;
sd->queued_bytes += io_u->xfer_buflen;
sd->queued++;
}
static int fio_vsyncio_queue(struct thread_data *td, struct io_u *io_u)
{
struct syncio_data *sd = td->io_ops->data;
fio_ro_check(td, io_u);
if (!fio_vsyncio_append(td, io_u)) {
dprint(FD_IO, "vsyncio_queue: no append (%d)\n", sd->queued);
/*
* If we can't append and have stuff queued, tell fio to
* commit those first and then retry this io
*/
if (sd->queued)
return FIO_Q_BUSY;
if (ddir_sync(io_u->ddir)) {
int ret = do_io_u_sync(td, io_u);
return fio_io_end(td, io_u, ret);
}
sd->queued = 0;
sd->queued_bytes = 0;
fio_vsyncio_set_iov(sd, io_u, 0);
} else {
if (sd->queued == td->o.iodepth) {
dprint(FD_IO, "vsyncio_queue: max depth %d\n", sd->queued);
return FIO_Q_BUSY;
}
dprint(FD_IO, "vsyncio_queue: append\n");
fio_vsyncio_set_iov(sd, io_u, sd->queued);
}
dprint(FD_IO, "vsyncio_queue: depth now %d\n", sd->queued);
return FIO_Q_QUEUED;
}
/*
* Check that we transferred all bytes, or saw an error, etc
*/
static int fio_vsyncio_end(struct thread_data *td, ssize_t bytes)
{
struct syncio_data *sd = td->io_ops->data;
struct io_u *io_u;
unsigned int i;
int err;
/*
* transferred everything, perfect
*/
if (bytes == sd->queued_bytes)
return 0;
err = errno;
for (i = 0; i < sd->queued; i++) {
io_u = sd->io_us[i];
if (bytes == -1) {
io_u->error = err;
} else {
unsigned int this_io;
this_io = bytes;
if (this_io > io_u->xfer_buflen)
this_io = io_u->xfer_buflen;
io_u->resid = io_u->xfer_buflen - this_io;
io_u->error = 0;
bytes -= this_io;
}
}
if (bytes == -1) {
td_verror(td, err, "xfer vsync");
return -err;
}
return 0;
}
static int fio_vsyncio_commit(struct thread_data *td)
{
struct syncio_data *sd = td->io_ops->data;
struct fio_file *f;
ssize_t ret;
if (!sd->queued)
return 0;
io_u_mark_submit(td, sd->queued);
f = sd->last_file;
if (lseek(f->fd, sd->io_us[0]->offset, SEEK_SET) == -1) {
int err = -errno;
td_verror(td, errno, "lseek");
return err;
}
if (sd->last_ddir == DDIR_READ)
ret = readv(f->fd, sd->iovecs, sd->queued);
else
ret = writev(f->fd, sd->iovecs, sd->queued);
dprint(FD_IO, "vsyncio_commit: %d\n", (int) ret);
sd->events = sd->queued;
sd->queued = 0;
return fio_vsyncio_end(td, ret);
}
static int fio_vsyncio_init(struct thread_data *td)
{
struct syncio_data *sd;
sd = malloc(sizeof(*sd));
memset(sd, 0, sizeof(*sd));
sd->last_offset = -1ULL;
sd->iovecs = malloc(td->o.iodepth * sizeof(struct iovec));
sd->io_us = malloc(td->o.iodepth * sizeof(struct io_u *));
td->io_ops->data = sd;
return 0;
}
static void fio_vsyncio_cleanup(struct thread_data *td)
{
struct syncio_data *sd = td->io_ops->data;
free(sd->iovecs);
free(sd->io_us);
free(sd);
}
static struct ioengine_ops ioengine_rw = {
.name = "sync",
.version = FIO_IOOPS_VERSION,
.prep = fio_syncio_prep,
.queue = fio_syncio_queue,
.open_file = generic_open_file,
.close_file = generic_close_file,
.get_file_size = generic_get_file_size,
.flags = FIO_SYNCIO,
};
static struct ioengine_ops ioengine_prw = {
.name = "psync",
.version = FIO_IOOPS_VERSION,
.queue = fio_psyncio_queue,
.open_file = generic_open_file,
.close_file = generic_close_file,
.get_file_size = generic_get_file_size,
.flags = FIO_SYNCIO,
};
static struct ioengine_ops ioengine_vrw = {
.name = "vsync",
.version = FIO_IOOPS_VERSION,
.init = fio_vsyncio_init,
.cleanup = fio_vsyncio_cleanup,
.queue = fio_vsyncio_queue,
.commit = fio_vsyncio_commit,
.event = fio_vsyncio_event,
.getevents = fio_vsyncio_getevents,
.open_file = generic_open_file,
.close_file = generic_close_file,
.get_file_size = generic_get_file_size,
.flags = FIO_SYNCIO,
};
#ifdef CONFIG_PWRITEV
static struct ioengine_ops ioengine_pvrw = {
.name = "pvsync",
.version = FIO_IOOPS_VERSION,
.init = fio_vsyncio_init,
.cleanup = fio_vsyncio_cleanup,
.queue = fio_pvsyncio_queue,
.open_file = generic_open_file,
.close_file = generic_close_file,
.get_file_size = generic_get_file_size,
.flags = FIO_SYNCIO,
};
#endif
static void fio_init fio_syncio_register(void)
{
register_ioengine(&ioengine_rw);
register_ioengine(&ioengine_prw);
register_ioengine(&ioengine_vrw);
#ifdef CONFIG_PWRITEV
register_ioengine(&ioengine_pvrw);
#endif
}
static void fio_exit fio_syncio_unregister(void)
{
unregister_ioengine(&ioengine_rw);
unregister_ioengine(&ioengine_prw);
unregister_ioengine(&ioengine_vrw);
#ifdef CONFIG_PWRITEV
unregister_ioengine(&ioengine_pvrw);
#endif
}
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