Refactor #includes and headers
[fio.git] / engines / sg.c
index 8acbd50..7b18c28 100644 (file)
@@ -8,15 +8,53 @@
 #include <stdlib.h>
 #include <unistd.h>
 #include <errno.h>
-#include <assert.h>
 #include <sys/poll.h>
 
 #include "../fio.h"
+#include "../optgroup.h"
 
 #ifdef FIO_HAVE_SGIO
 
+
+struct sg_options {
+       void *pad;
+       unsigned int readfua;
+       unsigned int writefua;
+};
+
+static struct fio_option options[] = {
+       {
+               .name   = "readfua",
+               .lname  = "sg engine read fua flag support",
+               .type   = FIO_OPT_BOOL,
+               .off1   = offsetof(struct sg_options, readfua),
+               .help   = "Set FUA flag (force unit access) for all Read operations",
+               .def    = "0",
+               .category = FIO_OPT_C_ENGINE,
+               .group  = FIO_OPT_G_SG,
+       },
+       {
+               .name   = "writefua",
+               .lname  = "sg engine write fua flag support",
+               .type   = FIO_OPT_BOOL,
+               .off1   = offsetof(struct sg_options, writefua),
+               .help   = "Set FUA flag (force unit access) for all Write operations",
+               .def    = "0",
+               .category = FIO_OPT_C_ENGINE,
+               .group  = FIO_OPT_G_SG,
+       },
+       {
+               .name   = NULL,
+       },
+};
+
+#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[10];
+       unsigned char cdb[16];      // enhanced from 10 to support 16 byte commands
+       unsigned char sb[MAX_SB];   // add sense block to commands
        int nr;
 };
 
@@ -41,6 +79,8 @@ static void sgio_hdr_init(struct sgio_data *sd, struct sg_io_hdr *hdr,
        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;
 
@@ -61,12 +101,41 @@ static int pollin_events(struct pollfd *pfds, int fds)
        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, ret, r = 0;
+       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;
@@ -88,7 +157,9 @@ static int fio_sgio_getevents(struct thread_data *td, unsigned int min,
        }
 
        while (left) {
-               void *p;
+               char *p;
+
+               dprint(FD_IO, "sgio_getevents: sd %p: left=%d\n", sd, left);
 
                do {
                        if (!min)
@@ -114,20 +185,21 @@ re_read:
                p = buf;
                events = 0;
                for_each_file(td, f, i) {
-                       ret = read(f->fd, p, left * sizeof(struct sg_io_hdr));
-                       if (ret < 0) {
-                               if (errno == EAGAIN)
-                                       continue;
-                               r = -errno;
-                               td_verror(td, errno, "read");
-                               break;
-                       } else if (ret) {
-                               p += ret;
-                               events += ret / sizeof(struct sg_io_hdr);
+                       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)
+               if (r < 0 && !events)
                        break;
                if (!events) {
                        usleep(1000);
@@ -139,8 +211,15 @@ re_read:
 
                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(&io_u->hdr, hdr, sizeof(struct sg_io_hdr));
+                               sd->events[i]->error = EIO;
+                       }
                }
        }
 
@@ -160,7 +239,7 @@ re_read:
 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 sgio_data *sd = td->io_ops_data;
        struct sg_io_hdr *hdr = &io_u->hdr;
        int ret;
 
@@ -170,6 +249,10 @@ static int fio_sgio_ioctl_doio(struct thread_data *td,
        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;
 }
 
@@ -186,6 +269,11 @@ static int fio_sgio_rw_doio(struct fio_file *f, struct io_u *io_u, int 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;
        }
 
@@ -195,52 +283,97 @@ static int fio_sgio_rw_doio(struct fio_file *f, struct io_u *io_u, int do_sync)
 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_BD)
-               return fio_sgio_ioctl_doio(td, f, io_u);
+       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 fio_sgio_rw_doio(f, io_u, do_sync);
+       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;
-       int nr_blocks, lba;
+       struct sg_options *o = td->eo;
+       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;
-               hdr->cmdp[0] = 0x28;
+               if (lba < MAX_10B_LBA)
+                       hdr->cmdp[0] = 0x28; // read(10)
+               else
+                       hdr->cmdp[0] = 0x88; // read(16)
+
+               if (o->readfua)
+                       hdr->cmdp[1] |= 0x08;
+
        } else if (io_u->ddir == DDIR_WRITE) {
                sgio_hdr_init(sd, hdr, io_u, 1);
 
                hdr->dxfer_direction = SG_DXFER_TO_DEV;
-               hdr->cmdp[0] = 0x2a;
+               if (lba < MAX_10B_LBA)
+                       hdr->cmdp[0] = 0x2a; // write(10)
+               else
+                       hdr->cmdp[0] = 0x8a; // write(16)
+
+               if (o->writefua)
+                       hdr->cmdp[1] |= 0x08;
+
        } else {
                sgio_hdr_init(sd, hdr, io_u, 0);
-
                hdr->dxfer_direction = SG_DXFER_NONE;
-               hdr->cmdp[0] = 0x35;
+               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) {
-               nr_blocks = io_u->xfer_buflen / sd->bs;
-               lba = io_u->offset / sd->bs;
-               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);
+               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;
 }
 
@@ -273,42 +406,103 @@ static int fio_sgio_queue(struct thread_data *td, struct io_u *io_u)
 
 static struct io_u *fio_sgio_event(struct thread_data *td, int event)
 {
-       struct sgio_data *sd = td->io_ops->data;
+       struct sgio_data *sd = td->io_ops_data;
 
        return sd->events[event];
 }
 
-static int fio_sgio_get_bs(struct thread_data *td, unsigned int *bs)
+static int fio_sgio_read_capacity(struct thread_data *td, unsigned int *bs,
+                                 unsigned long long *max_lba)
 {
-       struct sgio_data *sd = td->io_ops->data;
-       struct io_u io_u;
-       struct sg_io_hdr *hdr;
-       unsigned char buf[8];
+       /*
+        * 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;
 
-       memset(&io_u, 0, sizeof(io_u));
-       io_u.file = td->files[0];
+       struct fio_file *f = td->files[0];
 
-       hdr = &io_u.hdr;
-       sgio_hdr_init(sd, hdr, &io_u, 0);
-       memset(buf, 0, sizeof(buf));
+       /* open file independent of rest of application */
+       fd = open(f->file_name, O_RDONLY);
+       if (fd < 0)
+               return -errno;
 
-       hdr->cmdp[0] = 0x25;
-       hdr->dxfer_direction = SG_DXFER_FROM_DEV;
-       hdr->dxferp = buf;
-       hdr->dxfer_len = sizeof(buf);
+       memset(&hdr, 0, sizeof(hdr));
+       memset(cmd, 0, sizeof(cmd));
+       memset(sb, 0, sizeof(sb));
+       memset(buf, 0, sizeof(buf));
 
-       ret = fio_sgio_doio(td, &io_u, 1);
-       if (ret)
+       /* 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;
+               }
 
-       *bs = (buf[4] << 24) | (buf[5] << 16) | (buf[6] << 8) | buf[7];
+               /* 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;
+       struct sgio_data *sd = td->io_ops_data;
 
        if (sd) {
                free(sd->events);
@@ -336,8 +530,8 @@ static int fio_sgio_init(struct thread_data *td)
        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);
-
-       td->io_ops->data = sd;
+       sd->type_checked = 0;
+       td->io_ops_data = sd;
 
        /*
         * we want to do it, regardless of whether odirect is set or not
@@ -348,10 +542,11 @@ static int fio_sgio_init(struct thread_data *td)
 
 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;
+       struct sgio_data *sd = td->io_ops_data;
+       unsigned int bs = 0;
+       unsigned long long max_lba = 0;
 
-       if (f->filetype == FIO_TYPE_BD) {
+       if (f->filetype == FIO_TYPE_BLOCK) {
                if (ioctl(f->fd, BLKSSZGET, &bs) < 0) {
                        td_verror(td, errno, "ioctl");
                        return 1;
@@ -364,28 +559,38 @@ static int fio_sgio_type_check(struct thread_data *td, struct fio_file *f)
                        return 1;
                }
 
-               ret = fio_sgio_get_bs(td, &bs);
-               if (ret)
+               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 devices\n");
+               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_BD) {
+       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;
+       struct sgio_data *sd = td->io_ops_data;
        int ret;
 
        ret = generic_open_file(td, f);
@@ -400,6 +605,251 @@ static int fio_sgio_open(struct thread_data *td, struct fio_file *f)
        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];
+       int i;
+
+       msg = calloc(1, MAXERRDETAIL);
+       strcpy(msg, "");
+
+       /*
+        * 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) {
+               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);
+               }
+       }
+
+       if (!(hdr->info & SG_INFO_CHECK) && !strlen(msg))
+               strncpy(msg, "SG Driver did not report a Host, Driver or Device check",
+                       MAXERRDETAIL - 1);
+
+       return msg;
+}
+
+/*
+ * 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,
@@ -407,12 +857,15 @@ static struct ioengine_ops ioengine = {
        .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  = generic_get_file_size,
+       .get_file_size  = fio_sgio_get_file_size,
        .flags          = FIO_SYNCIO | FIO_RAWIO,
+       .options        = options,
+       .option_struct_size     = sizeof(struct sg_options)
 };
 
 #else /* FIO_HAVE_SGIO */