/*
* sg engine
*
* IO engine that uses the Linux SG v3 interface to talk to SCSI devices
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <sys/poll.h>
#include "../fio.h"
#ifdef FIO_HAVE_SGIO
#define MAX_10B_LBA 0xFFFFFFFFULL
#define SCSI_TIMEOUT_MS 30000 // 30 second timeout; currently no method to override
#define MAX_SB 64 // sense block maximum return size
struct sgio_cmd {
unsigned char cdb[16]; // enhanced from 10 to support 16 byte commands
unsigned char sb[MAX_SB]; // add sense block to commands
int nr;
};
struct sgio_data {
struct sgio_cmd *cmds;
struct io_u **events;
struct pollfd *pfds;
int *fd_flags;
void *sgbuf;
unsigned int bs;
int type_checked;
};
static void sgio_hdr_init(struct sgio_data *sd, struct sg_io_hdr *hdr,
struct io_u *io_u, int fs)
{
struct sgio_cmd *sc = &sd->cmds[io_u->index];
memset(hdr, 0, sizeof(*hdr));
memset(sc->cdb, 0, sizeof(sc->cdb));
hdr->interface_id = 'S';
hdr->cmdp = sc->cdb;
hdr->cmd_len = sizeof(sc->cdb);
hdr->sbp = sc->sb;
hdr->mx_sb_len = sizeof(sc->sb);
hdr->pack_id = io_u->index;
hdr->usr_ptr = io_u;
if (fs) {
hdr->dxferp = io_u->xfer_buf;
hdr->dxfer_len = io_u->xfer_buflen;
}
}
static int pollin_events(struct pollfd *pfds, int fds)
{
int i;
for (i = 0; i < fds; i++)
if (pfds[i].revents & POLLIN)
return 1;
return 0;
}
static int sg_fd_read(int fd, void *data, size_t size)
{
int err = 0;
while (size) {
ssize_t ret;
ret = read(fd, data, size);
if (ret < 0) {
if (errno == EAGAIN || errno == EINTR)
continue;
err = errno;
break;
} else if (!ret)
break;
else {
data += ret;
size -= ret;
}
}
if (err)
return err;
if (size)
return EAGAIN;
return 0;
}
static int fio_sgio_getevents(struct thread_data *td, unsigned int min,
unsigned int max,
const struct timespec fio_unused *t)
{
struct sgio_data *sd = td->io_ops_data;
int left = max, eventNum, ret, r = 0;
void *buf = sd->sgbuf;
unsigned int i, events;
struct fio_file *f;
/*
* Fill in the file descriptors
*/
for_each_file(td, f, i) {
/*
* don't block for min events == 0
*/
if (!min)
sd->fd_flags[i] = fio_set_fd_nonblocking(f->fd, "sg");
else
sd->fd_flags[i] = -1;
sd->pfds[i].fd = f->fd;
sd->pfds[i].events = POLLIN;
}
while (left) {
void *p;
dprint(FD_IO, "sgio_getevents: sd %p: left=%d\n", sd, left);
do {
if (!min)
break;
ret = poll(sd->pfds, td->o.nr_files, -1);
if (ret < 0) {
if (!r)
r = -errno;
td_verror(td, errno, "poll");
break;
} else if (!ret)
continue;
if (pollin_events(sd->pfds, td->o.nr_files))
break;
} while (1);
if (r < 0)
break;
re_read:
p = buf;
events = 0;
for_each_file(td, f, i) {
for (eventNum = 0; eventNum < left; eventNum++) {
ret = sg_fd_read(f->fd, p, sizeof(struct sg_io_hdr));
dprint(FD_IO, "sgio_getevents: ret: %d\n", ret);
if (ret) {
r = -ret;
td_verror(td, r, "sg_read");
break;
}
p += sizeof(struct sg_io_hdr);
events++;
dprint(FD_IO, "sgio_getevents: events: %d\n", events);
}
}
if (r < 0 && !events)
break;
if (!events) {
usleep(1000);
goto re_read;
}
left -= events;
r += events;
for (i = 0; i < events; i++) {
struct sg_io_hdr *hdr = (struct sg_io_hdr *) buf + i;
sd->events[i] = hdr->usr_ptr;
/* record if an io error occurred, ignore resid */
if (hdr->info & SG_INFO_CHECK) {
struct io_u *io_u;
io_u = (struct io_u *)(hdr->usr_ptr);
memcpy((void*)&(io_u->hdr), (void*)hdr, sizeof(struct sg_io_hdr));
sd->events[i]->error = EIO;
}
}
}
if (!min) {
for_each_file(td, f, i) {
if (sd->fd_flags[i] == -1)
continue;
if (fcntl(f->fd, F_SETFL, sd->fd_flags[i]) < 0)
log_err("fio: sg failed to restore fcntl flags: %s\n", strerror(errno));
}
}
return r;
}
static int fio_sgio_ioctl_doio(struct thread_data *td,
struct fio_file *f, struct io_u *io_u)
{
struct sgio_data *sd = td->io_ops_data;
struct sg_io_hdr *hdr = &io_u->hdr;
int ret;
sd->events[0] = io_u;
ret = ioctl(f->fd, SG_IO, hdr);
if (ret < 0)
return ret;
/* record if an io error occurred */
if (hdr->info & SG_INFO_CHECK)
io_u->error = EIO;
return FIO_Q_COMPLETED;
}
static int fio_sgio_rw_doio(struct fio_file *f, struct io_u *io_u, int do_sync)
{
struct sg_io_hdr *hdr = &io_u->hdr;
int ret;
ret = write(f->fd, hdr, sizeof(*hdr));
if (ret < 0)
return ret;
if (do_sync) {
ret = read(f->fd, hdr, sizeof(*hdr));
if (ret < 0)
return ret;
/* record if an io error occurred */
if (hdr->info & SG_INFO_CHECK)
io_u->error = EIO;
return FIO_Q_COMPLETED;
}
return FIO_Q_QUEUED;
}
static int fio_sgio_doio(struct thread_data *td, struct io_u *io_u, int do_sync)
{
struct fio_file *f = io_u->file;
int ret;
if (f->filetype == FIO_TYPE_BLOCK) {
ret = fio_sgio_ioctl_doio(td, f, io_u);
td->error = io_u->error;
} else {
ret = fio_sgio_rw_doio(f, io_u, do_sync);
if (do_sync)
td->error = io_u->error;
}
return ret;
}
static int fio_sgio_prep(struct thread_data *td, struct io_u *io_u)
{
struct sg_io_hdr *hdr = &io_u->hdr;
struct sgio_data *sd = td->io_ops_data;
long long nr_blocks, lba;
if (io_u->xfer_buflen & (sd->bs - 1)) {
log_err("read/write not sector aligned\n");
return EINVAL;
}
nr_blocks = io_u->xfer_buflen / sd->bs;
lba = io_u->offset / sd->bs;
if (io_u->ddir == DDIR_READ) {
sgio_hdr_init(sd, hdr, io_u, 1);
hdr->dxfer_direction = SG_DXFER_FROM_DEV;
if (lba < MAX_10B_LBA)
hdr->cmdp[0] = 0x28; // read(10)
else
hdr->cmdp[0] = 0x88; // read(16)
} else if (io_u->ddir == DDIR_WRITE) {
sgio_hdr_init(sd, hdr, io_u, 1);
hdr->dxfer_direction = SG_DXFER_TO_DEV;
if (lba < MAX_10B_LBA)
hdr->cmdp[0] = 0x2a; // write(10)
else
hdr->cmdp[0] = 0x8a; // write(16)
} else {
sgio_hdr_init(sd, hdr, io_u, 0);
hdr->dxfer_direction = SG_DXFER_NONE;
if (lba < MAX_10B_LBA)
hdr->cmdp[0] = 0x35; // synccache(10)
else
hdr->cmdp[0] = 0x91; // synccache(16)
}
/*
* for synccache, we leave lba and length to 0 to sync all
* blocks on medium.
*/
if (hdr->dxfer_direction != SG_DXFER_NONE) {
if (lba < MAX_10B_LBA) {
hdr->cmdp[2] = (unsigned char) ((lba >> 24) & 0xff);
hdr->cmdp[3] = (unsigned char) ((lba >> 16) & 0xff);
hdr->cmdp[4] = (unsigned char) ((lba >> 8) & 0xff);
hdr->cmdp[5] = (unsigned char) (lba & 0xff);
hdr->cmdp[7] = (unsigned char) ((nr_blocks >> 8) & 0xff);
hdr->cmdp[8] = (unsigned char) (nr_blocks & 0xff);
} else {
hdr->cmdp[2] = (unsigned char) ((lba >> 56) & 0xff);
hdr->cmdp[3] = (unsigned char) ((lba >> 48) & 0xff);
hdr->cmdp[4] = (unsigned char) ((lba >> 40) & 0xff);
hdr->cmdp[5] = (unsigned char) ((lba >> 32) & 0xff);
hdr->cmdp[6] = (unsigned char) ((lba >> 24) & 0xff);
hdr->cmdp[7] = (unsigned char) ((lba >> 16) & 0xff);
hdr->cmdp[8] = (unsigned char) ((lba >> 8) & 0xff);
hdr->cmdp[9] = (unsigned char) (lba & 0xff);
hdr->cmdp[10] = (unsigned char) ((nr_blocks >> 32) & 0xff);
hdr->cmdp[11] = (unsigned char) ((nr_blocks >> 16) & 0xff);
hdr->cmdp[12] = (unsigned char) ((nr_blocks >> 8) & 0xff);
hdr->cmdp[13] = (unsigned char) (nr_blocks & 0xff);
}
}
hdr->timeout = SCSI_TIMEOUT_MS;
return 0;
}
static int fio_sgio_queue(struct thread_data *td, struct io_u *io_u)
{
struct sg_io_hdr *hdr = &io_u->hdr;
int ret, do_sync = 0;
fio_ro_check(td, io_u);
if (td->o.sync_io || td->o.odirect || ddir_sync(io_u->ddir))
do_sync = 1;
ret = fio_sgio_doio(td, io_u, do_sync);
if (ret < 0)
io_u->error = errno;
else if (hdr->status) {
io_u->resid = hdr->resid;
io_u->error = EIO;
}
if (io_u->error) {
td_verror(td, io_u->error, "xfer");
return FIO_Q_COMPLETED;
}
return ret;
}
static struct io_u *fio_sgio_event(struct thread_data *td, int event)
{
struct sgio_data *sd = td->io_ops_data;
return sd->events[event];
}
static int fio_sgio_read_capacity(struct thread_data *td, unsigned int *bs,
unsigned long long *max_lba)
{
/*
* need to do read capacity operation w/o benefit of sd or
* io_u structures, which are not initialized until later.
*/
struct sg_io_hdr hdr;
unsigned char cmd[16];
unsigned char sb[64];
unsigned char buf[32]; // read capacity return
int ret;
int fd = -1;
struct fio_file *f = td->files[0];
/* open file independent of rest of application */
fd = open(f->file_name, O_RDONLY);
if (fd < 0)
return -errno;
memset(&hdr, 0, sizeof(hdr));
memset(cmd, 0, sizeof(cmd));
memset(sb, 0, sizeof(sb));
memset(buf, 0, sizeof(buf));
/* First let's try a 10 byte read capacity. */
hdr.interface_id = 'S';
hdr.cmdp = cmd;
hdr.cmd_len = 10;
hdr.sbp = sb;
hdr.mx_sb_len = sizeof(sb);
hdr.timeout = SCSI_TIMEOUT_MS;
hdr.cmdp[0] = 0x25; // Read Capacity(10)
hdr.dxfer_direction = SG_DXFER_FROM_DEV;
hdr.dxferp = buf;
hdr.dxfer_len = sizeof(buf);
ret = ioctl(fd, SG_IO, &hdr);
if (ret < 0) {
close(fd);
return ret;
}
*bs = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7];
*max_lba = ((buf[0] << 24) | (buf[1] << 16) | (buf[2] << 8) | buf[3]) & MAX_10B_LBA; // for some reason max_lba is being sign extended even though unsigned.
/*
* If max lba masked by MAX_10B_LBA equals MAX_10B_LBA,
* then need to retry with 16 byte Read Capacity command.
*/
if (*max_lba == MAX_10B_LBA) {
hdr.cmd_len = 16;
hdr.cmdp[0] = 0x9e; // service action
hdr.cmdp[1] = 0x10; // Read Capacity(16)
hdr.cmdp[10] = (unsigned char) ((sizeof(buf) >> 24) & 0xff);
hdr.cmdp[11] = (unsigned char) ((sizeof(buf) >> 16) & 0xff);
hdr.cmdp[12] = (unsigned char) ((sizeof(buf) >> 8) & 0xff);
hdr.cmdp[13] = (unsigned char) (sizeof(buf) & 0xff);
hdr.dxfer_direction = SG_DXFER_FROM_DEV;
hdr.dxferp = buf;
hdr.dxfer_len = sizeof(buf);
ret = ioctl(fd, SG_IO, &hdr);
if (ret < 0) {
close(fd);
return ret;
}
/* record if an io error occurred */
if (hdr.info & SG_INFO_CHECK)
td_verror(td, EIO, "fio_sgio_read_capacity");
*bs = (buf[8] << 24) | (buf[9] << 16) | (buf[10] << 8) | buf[11];
*max_lba = ((unsigned long long)buf[0] << 56) |
((unsigned long long)buf[1] << 48) |
((unsigned long long)buf[2] << 40) |
((unsigned long long)buf[3] << 32) |
((unsigned long long)buf[4] << 24) |
((unsigned long long)buf[5] << 16) |
((unsigned long long)buf[6] << 8) |
(unsigned long long)buf[7];
}
close(fd);
return 0;
}
static void fio_sgio_cleanup(struct thread_data *td)
{
struct sgio_data *sd = td->io_ops_data;
if (sd) {
free(sd->events);
free(sd->cmds);
free(sd->fd_flags);
free(sd->pfds);
free(sd->sgbuf);
free(sd);
}
}
static int fio_sgio_init(struct thread_data *td)
{
struct sgio_data *sd;
sd = malloc(sizeof(*sd));
memset(sd, 0, sizeof(*sd));
sd->cmds = malloc(td->o.iodepth * sizeof(struct sgio_cmd));
memset(sd->cmds, 0, td->o.iodepth * sizeof(struct sgio_cmd));
sd->events = malloc(td->o.iodepth * sizeof(struct io_u *));
memset(sd->events, 0, td->o.iodepth * sizeof(struct io_u *));
sd->pfds = malloc(sizeof(struct pollfd) * td->o.nr_files);
memset(sd->pfds, 0, sizeof(struct pollfd) * td->o.nr_files);
sd->fd_flags = malloc(sizeof(int) * td->o.nr_files);
memset(sd->fd_flags, 0, sizeof(int) * td->o.nr_files);
sd->sgbuf = malloc(sizeof(struct sg_io_hdr) * td->o.iodepth);
memset(sd->sgbuf, 0, sizeof(struct sg_io_hdr) * td->o.iodepth);
sd->type_checked = 0;
td->io_ops_data = sd;
/*
* we want to do it, regardless of whether odirect is set or not
*/
td->o.override_sync = 1;
return 0;
}
static int fio_sgio_type_check(struct thread_data *td, struct fio_file *f)
{
struct sgio_data *sd = td->io_ops_data;
unsigned int bs = 0;
unsigned long long max_lba = 0;
if (f->filetype == FIO_TYPE_BLOCK) {
if (ioctl(f->fd, BLKSSZGET, &bs) < 0) {
td_verror(td, errno, "ioctl");
return 1;
}
} else if (f->filetype == FIO_TYPE_CHAR) {
int version, ret;
if (ioctl(f->fd, SG_GET_VERSION_NUM, &version) < 0) {
td_verror(td, errno, "ioctl");
return 1;
}
ret = fio_sgio_read_capacity(td, &bs, &max_lba);
if (ret) {
td_verror(td, td->error, "fio_sgio_read_capacity");
log_err("ioengine sg unable to read capacity successfully\n");
return 1;
}
} else {
td_verror(td, EINVAL, "wrong file type");
log_err("ioengine sg only works on block or character devices\n");
return 1;
}
sd->bs = bs;
// Determine size of commands needed based on max_lba
if (max_lba >= MAX_10B_LBA) {
dprint(FD_IO, "sgio_type_check: using 16 byte read/write "
"commands for lba above 0x%016llx/0x%016llx\n",
MAX_10B_LBA, max_lba);
}
if (f->filetype == FIO_TYPE_BLOCK) {
td->io_ops->getevents = NULL;
td->io_ops->event = NULL;
}
sd->type_checked = 1;
return 0;
}
static int fio_sgio_open(struct thread_data *td, struct fio_file *f)
{
struct sgio_data *sd = td->io_ops_data;
int ret;
ret = generic_open_file(td, f);
if (ret)
return ret;
if (sd && !sd->type_checked && fio_sgio_type_check(td, f)) {
ret = generic_close_file(td, f);
return 1;
}
return 0;
}
/*
* Build an error string with details about the driver, host or scsi
* error contained in the sg header Caller will use as necessary.
*/
static char *fio_sgio_errdetails(struct io_u *io_u)
{
struct sg_io_hdr *hdr = &io_u->hdr;
#define MAXERRDETAIL 1024
#define MAXMSGCHUNK 128
char *msg, msgchunk[MAXMSGCHUNK], *ret = NULL;
int i;
msg = calloc(1, MAXERRDETAIL);
/*
* can't seem to find sg_err.h, so I'll just echo the define values
* so others can search on internet to find clearer clues of meaning.
*/
if (hdr->info & SG_INFO_CHECK) {
ret = msg;
if (hdr->host_status) {
snprintf(msgchunk, MAXMSGCHUNK, "SG Host Status: 0x%02x; ", hdr->host_status);
strlcat(msg, msgchunk, MAXERRDETAIL);
switch (hdr->host_status) {
case 0x01:
strlcat(msg, "SG_ERR_DID_NO_CONNECT", MAXERRDETAIL);
break;
case 0x02:
strlcat(msg, "SG_ERR_DID_BUS_BUSY", MAXERRDETAIL);
break;
case 0x03:
strlcat(msg, "SG_ERR_DID_TIME_OUT", MAXERRDETAIL);
break;
case 0x04:
strlcat(msg, "SG_ERR_DID_BAD_TARGET", MAXERRDETAIL);
break;
case 0x05:
strlcat(msg, "SG_ERR_DID_ABORT", MAXERRDETAIL);
break;
case 0x06:
strlcat(msg, "SG_ERR_DID_PARITY", MAXERRDETAIL);
break;
case 0x07:
strlcat(msg, "SG_ERR_DID_ERROR (internal error)", MAXERRDETAIL);
break;
case 0x08:
strlcat(msg, "SG_ERR_DID_RESET", MAXERRDETAIL);
break;
case 0x09:
strlcat(msg, "SG_ERR_DID_BAD_INTR (unexpected)", MAXERRDETAIL);
break;
case 0x0a:
strlcat(msg, "SG_ERR_DID_PASSTHROUGH", MAXERRDETAIL);
break;
case 0x0b:
strlcat(msg, "SG_ERR_DID_SOFT_ERROR (driver retry?)", MAXERRDETAIL);
break;
case 0x0c:
strlcat(msg, "SG_ERR_DID_IMM_RETRY", MAXERRDETAIL);
break;
case 0x0d:
strlcat(msg, "SG_ERR_DID_REQUEUE", MAXERRDETAIL);
break;
case 0x0e:
strlcat(msg, "SG_ERR_DID_TRANSPORT_DISRUPTED", MAXERRDETAIL);
break;
case 0x0f:
strlcat(msg, "SG_ERR_DID_TRANSPORT_FAILFAST", MAXERRDETAIL);
break;
case 0x10:
strlcat(msg, "SG_ERR_DID_TARGET_FAILURE", MAXERRDETAIL);
break;
case 0x11:
strlcat(msg, "SG_ERR_DID_NEXUS_FAILURE", MAXERRDETAIL);
break;
case 0x12:
strlcat(msg, "SG_ERR_DID_ALLOC_FAILURE", MAXERRDETAIL);
break;
case 0x13:
strlcat(msg, "SG_ERR_DID_MEDIUM_ERROR", MAXERRDETAIL);
break;
default:
strlcat(msg, "Unknown", MAXERRDETAIL);
break;
}
strlcat(msg, ". ", MAXERRDETAIL);
}
if (hdr->driver_status) {
snprintf(msgchunk, MAXMSGCHUNK, "SG Driver Status: 0x%02x; ", hdr->driver_status);
strlcat(msg, msgchunk, MAXERRDETAIL);
switch (hdr->driver_status & 0x0F) {
case 0x01:
strlcat(msg, "SG_ERR_DRIVER_BUSY", MAXERRDETAIL);
break;
case 0x02:
strlcat(msg, "SG_ERR_DRIVER_SOFT", MAXERRDETAIL);
break;
case 0x03:
strlcat(msg, "SG_ERR_DRIVER_MEDIA", MAXERRDETAIL);
break;
case 0x04:
strlcat(msg, "SG_ERR_DRIVER_ERROR", MAXERRDETAIL);
break;
case 0x05:
strlcat(msg, "SG_ERR_DRIVER_INVALID", MAXERRDETAIL);
break;
case 0x06:
strlcat(msg, "SG_ERR_DRIVER_TIMEOUT", MAXERRDETAIL);
break;
case 0x07:
strlcat(msg, "SG_ERR_DRIVER_HARD", MAXERRDETAIL);
break;
case 0x08:
strlcat(msg, "SG_ERR_DRIVER_SENSE", MAXERRDETAIL);
break;
default:
strlcat(msg, "Unknown", MAXERRDETAIL);
break;
}
strlcat(msg, "; ", MAXERRDETAIL);
switch (hdr->driver_status & 0xF0) {
case 0x10:
strlcat(msg, "SG_ERR_SUGGEST_RETRY", MAXERRDETAIL);
break;
case 0x20:
strlcat(msg, "SG_ERR_SUGGEST_ABORT", MAXERRDETAIL);
break;
case 0x30:
strlcat(msg, "SG_ERR_SUGGEST_REMAP", MAXERRDETAIL);
break;
case 0x40:
strlcat(msg, "SG_ERR_SUGGEST_DIE", MAXERRDETAIL);
break;
case 0x80:
strlcat(msg, "SG_ERR_SUGGEST_SENSE", MAXERRDETAIL);
break;
}
strlcat(msg, ". ", MAXERRDETAIL);
}
if (hdr->status) {
snprintf(msgchunk, MAXMSGCHUNK, "SG SCSI Status: 0x%02x; ", hdr->status);
strlcat(msg, msgchunk, MAXERRDETAIL);
// SCSI 3 status codes
switch (hdr->status) {
case 0x02:
strlcat(msg, "CHECK_CONDITION", MAXERRDETAIL);
break;
case 0x04:
strlcat(msg, "CONDITION_MET", MAXERRDETAIL);
break;
case 0x08:
strlcat(msg, "BUSY", MAXERRDETAIL);
break;
case 0x10:
strlcat(msg, "INTERMEDIATE", MAXERRDETAIL);
break;
case 0x14:
strlcat(msg, "INTERMEDIATE_CONDITION_MET", MAXERRDETAIL);
break;
case 0x18:
strlcat(msg, "RESERVATION_CONFLICT", MAXERRDETAIL);
break;
case 0x22:
strlcat(msg, "COMMAND_TERMINATED", MAXERRDETAIL);
break;
case 0x28:
strlcat(msg, "TASK_SET_FULL", MAXERRDETAIL);
break;
case 0x30:
strlcat(msg, "ACA_ACTIVE", MAXERRDETAIL);
break;
case 0x40:
strlcat(msg, "TASK_ABORTED", MAXERRDETAIL);
break;
default:
strlcat(msg, "Unknown", MAXERRDETAIL);
break;
}
strlcat(msg, ". ", MAXERRDETAIL);
}
if (hdr->sb_len_wr) {
snprintf(msgchunk, MAXMSGCHUNK, "Sense Data (%d bytes):", hdr->sb_len_wr);
strlcat(msg, msgchunk, MAXERRDETAIL);
for (i = 0; i < hdr->sb_len_wr; i++) {
snprintf(msgchunk, MAXMSGCHUNK, " %02x", hdr->sbp[i]);
strlcat(msg, msgchunk, MAXERRDETAIL);
}
strlcat(msg, ". ", MAXERRDETAIL);
}
if (hdr->resid != 0) {
snprintf(msgchunk, MAXMSGCHUNK, "SG Driver: %d bytes out of %d not transferred. ", hdr->resid, hdr->dxfer_len);
strlcat(msg, msgchunk, MAXERRDETAIL);
ret = msg;
}
}
if (!ret)
ret = strdup("SG Driver did not report a Host, Driver or Device check");
return ret;
}
/*
* get max file size from read capacity.
*/
static int fio_sgio_get_file_size(struct thread_data *td, struct fio_file *f)
{
/*
* get_file_size is being called even before sgio_init is
* called, so none of the sg_io structures are
* initialized in the thread_data yet. So we need to do the
* ReadCapacity without any of those helpers. One of the effects
* is that ReadCapacity may get called 4 times on each open:
* readcap(10) followed by readcap(16) if needed - just to get
* the file size after the init occurs - it will be called
* again when "type_check" is called during structure
* initialization I'm not sure how to prevent this little
* inefficiency.
*/
unsigned int bs = 0;
unsigned long long max_lba = 0;
int ret;
if (fio_file_size_known(f))
return 0;
if (f->filetype != FIO_TYPE_BLOCK && f->filetype != FIO_TYPE_CHAR) {
td_verror(td, EINVAL, "wrong file type");
log_err("ioengine sg only works on block or character devices\n");
return 1;
}
ret = fio_sgio_read_capacity(td, &bs, &max_lba);
if (ret ) {
td_verror(td, td->error, "fio_sgio_read_capacity");
log_err("ioengine sg unable to successfully execute read capacity to get block size and maximum lba\n");
return 1;
}
f->real_file_size = (max_lba + 1) * bs;
fio_file_set_size_known(f);
return 0;
}
static struct ioengine_ops ioengine = {
.name = "sg",
.version = FIO_IOOPS_VERSION,
.init = fio_sgio_init,
.prep = fio_sgio_prep,
.queue = fio_sgio_queue,
.getevents = fio_sgio_getevents,
.errdetails = fio_sgio_errdetails,
.event = fio_sgio_event,
.cleanup = fio_sgio_cleanup,
.open_file = fio_sgio_open,
.close_file = generic_close_file,
.get_file_size = fio_sgio_get_file_size,
.flags = FIO_SYNCIO | FIO_RAWIO,
};
#else /* FIO_HAVE_SGIO */
/*
* When we have a proper configure system in place, we simply wont build
* and install this io engine. For now install a crippled version that
* just complains and fails to load.
*/
static int fio_sgio_init(struct thread_data fio_unused *td)
{
log_err("fio: ioengine sg not available\n");
return 1;
}
static struct ioengine_ops ioengine = {
.name = "sg",
.version = FIO_IOOPS_VERSION,
.init = fio_sgio_init,
};
#endif
static void fio_init fio_sgio_register(void)
{
register_ioengine(&ioengine);
}
static void fio_exit fio_sgio_unregister(void)
{
unregister_ioengine(&ioengine);
}