static int scsi_generic_initfn(SCSIDevice *s) { int rc; int sg_version; struct sg_scsi_id scsiid; if (!s->conf.bs) { error_report("drive property not set"); return -1; } if (bdrv_get_on_error(s->conf.bs, 0) != BLOCKDEV_ON_ERROR_ENOSPC) { error_report("Device doesn't support drive option werror"); return -1; } if (bdrv_get_on_error(s->conf.bs, 1) != BLOCKDEV_ON_ERROR_REPORT) { error_report("Device doesn't support drive option rerror"); return -1; } /* check we are using a driver managing SG_IO (version 3 and after */ rc = bdrv_ioctl(s->conf.bs, SG_GET_VERSION_NUM, &sg_version); if (rc < 0) { error_report("cannot get SG_IO version number: %s. " "Is this a SCSI device?", strerror(-rc)); return -1; } if (sg_version < 30000) { error_report("scsi generic interface too old"); return -1; } /* get LUN of the /dev/sg? */ if (bdrv_ioctl(s->conf.bs, SG_GET_SCSI_ID, &scsiid)) { error_report("SG_GET_SCSI_ID ioctl failed"); return -1; } /* define device state */ s->type = scsiid.scsi_type; DPRINTF("device type %d\n", s->type); if (s->type == TYPE_DISK || s->type == TYPE_ROM) { add_boot_device_path(s->conf.bootindex, &s->qdev, NULL); } switch (s->type) { case TYPE_TAPE: s->blocksize = get_stream_blocksize(s->conf.bs); if (s->blocksize == -1) { s->blocksize = 0; } break; /* Make a guess for block devices, we'll fix it when the guest sends. * READ CAPACITY. If they don't, they likely would assume these sizes * anyway. (TODO: they could also send MODE SENSE). */ case TYPE_ROM: case TYPE_WORM: s->blocksize = 2048; break; default: s->blocksize = 512; break; } DPRINTF("block size %d\n", s->blocksize); return 0; }