static int32_t scsi_send_command(SCSIRequest *req, uint8_t *cmd)
{
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
SCSIDevice *s = r->req.dev;
int ret;
DPRINTF("Command: lun=%d tag=0x%x len %zd data=0x%02x", lun, tag,
r->req.cmd.xfer, cmd[0]);
#ifdef DEBUG_SCSI
{
int i;
for (i = 1; i < r->req.cmd.len; i++) {
printf(" 0x%02x", cmd[i]);
}
printf("\n");
}
#endif
if (r->req.cmd.xfer == 0) {
if (r->buf != NULL)
g_free(r->buf);
r->buflen = 0;
r->buf = NULL;
/* The request is used as the AIO opaque value, so add a ref. */
scsi_req_ref(&r->req);
ret = execute_command(s->conf.bs, r, SG_DXFER_NONE, scsi_command_complete);
if (ret < 0) {
scsi_command_complete(r, ret);
return 0;
}
return 0;
}
if (r->buflen != r->req.cmd.xfer) {
if (r->buf != NULL)
g_free(r->buf);
r->buf = g_malloc(r->req.cmd.xfer);
r->buflen = r->req.cmd.xfer;
}
memset(r->buf, 0, r->buflen);
r->len = r->req.cmd.xfer;
if (r->req.cmd.mode == SCSI_XFER_TO_DEV) {
r->len = 0;
return -r->req.cmd.xfer;
} else {
return r->req.cmd.xfer;
}
}
/* Write data to a scsi device. Returns nonzero on failure.
The transfer may complete asynchronously. */
static void scsi_write_data(SCSIRequest *req)
{
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
SCSIDevice *s = r->req.dev;
int ret;
DPRINTF("scsi_write_data 0x%x\n", req->tag);
if (r->len == 0) {
r->len = r->buflen;
scsi_req_data(&r->req, r->len);
return;
}
/* The request is used as the AIO opaque value, so add a ref. */
scsi_req_ref(&r->req);
ret = execute_command(s->conf.blk, r, SG_DXFER_TO_DEV, scsi_write_complete);
if (ret < 0) {
scsi_command_complete(r, ret);
}
}
/* Read more data from scsi device into buffer. */
static void scsi_read_data(SCSIRequest *req)
{
SCSIGenericReq *r = DO_UPCAST(SCSIGenericReq, req, req);
SCSIDevice *s = r->req.dev;
int ret;
DPRINTF("scsi_read_data tag=0x%x\n", req->tag);
/* The request is used as the AIO opaque value, so add a ref. */
scsi_req_ref(&r->req);
if (r->len == -1) {
scsi_command_complete_noio(r, 0);
return;
}
ret = execute_command(s->conf.blk, r, SG_DXFER_FROM_DEV,
scsi_read_complete);
if (ret < 0) {
scsi_command_complete_noio(r, ret);
}
}