static int
seqdevopen(ScsiReq *rp)
{
uint8_t mode[16], limits[6];
if(SRrblimits(rp, limits) == -1)
return -1;
if(limits[1] == 0 && limits[2] == limits[4] && limits[3] == limits[5]){
rp->flags |= Fbfixed;
rp->lbsize = limits[4]<<8 | limits[5];
if(debug)
fprint(2, "disk: seqdevopen: 10-byte logical block size %lud\n",
rp->lbsize);
return 0;
}
/*
* On some older hardware the optional 10-byte
* modeselect command isn't implemented.
*/
if (force6bytecmds)
rp->flags |= Fmode6;
if(!(rp->flags & Fmode6)){
/* try 10-byte command first */
memset(mode, 0, sizeof mode);
mode[3] = 0x10; /* device-specific param. */
mode[7] = 8; /* block descriptor length */
/*
* exabytes can't handle this, and
* modeselect(10) is optional.
*/
if(SRmodeselect10(rp, mode, sizeof mode) != -1){
rp->lbsize = 1;
return 0; /* success */
}
/* can't do 10-byte commands, back off to 6-byte ones */
rp->flags |= Fmode6;
}
/* 6-byte command */
memset(mode, 0, sizeof mode);
mode[2] = 0x10; /* device-specific param. */
mode[3] = 8; /* block descriptor length */
/*
* bsd sez exabytes need this bit (NBE: no busy enable) in
* vendor-specific page (0), but so far we haven't needed it.
mode[12] |= 8;
*/
if(SRmodeselect6(rp, mode, 4+8) == -1)
return -1;
rp->lbsize = 1;
return 0;
}
static long
cmdmodeselect10(ScsiReq *rp, int argc, char *argv[])
{
uchar list[MaxDirData];
long nbytes, ul;
char *p;
memset(list, 0, sizeof list);
for(nbytes = 0; argc; argc--, argv++, nbytes++){
if((ul = strtoul(argv[0], &p, 0)) == 0 && p == argv[0]){
rp->status = Status_BADARG;
return -1;
}
list[nbytes] = ul;
}
if(!(rp->flags & Finqok) && SRinquiry(rp) == -1)
Bprint(&bout, "warning: couldn't determine whether SCSI-1/SCSI-2 mode");
return SRmodeselect10(rp, list, nbytes);
}