static int
dirdevopen(ScsiReq *rp)
{
uint64_t blocks;
uint8_t data[8+4+20]; /* 16-byte result: lba, blksize, reserved */
memset(data, 0, sizeof data);
if(SRstart(rp, 1) == -1 || SRrcapacity(rp, data) == -1)
return -1;
rp->lbsize = GETBELONG(data+4);
blocks = GETBELONG(data);
if(debug)
fprint(2, "disk: dirdevopen: 10-byte logical block size %lud, "
"# blocks %llud\n", rp->lbsize, blocks);
if(blocks == 0xffffffff){
if(SRrcapacity16(rp, data) == -1)
return -1;
rp->lbsize = GETBELONG(data + 8);
blocks = (int64_t)GETBELONG(data)<<32 | GETBELONG(data + 4);
if(debug)
fprint(2, "disk: dirdevopen: 16-byte logical block size"
" %lud, # blocks %llud\n", rp->lbsize, blocks);
}
/* some newer dev's don't support 6-byte commands */
if(blocks > Max24off && !force6bytecmds)
rp->flags |= Frw10;
return 0;
}
int32_t
SRwrite(ScsiReq *rp, void *buf, int32_t nbytes)
{
uint8_t cmd[10];
int32_t n;
if(rp->lbsize == 0 || (nbytes % rp->lbsize) || nbytes > Maxiosize){
if(diskdebug)
if (nbytes % rp->lbsize)
fprint(2, "disk: i/o size %ld %% %ld != 0\n",
nbytes, rp->lbsize);
else
fprint(2, "disk: i/o size %ld > %d\n",
nbytes, Maxiosize);
rp->status = Status_BADARG;
return -1;
}
/* set up scsi write cmd */
cmd[0] = ScmdWrite;
if(rp->flags & Fseqdev)
rp->cmd.count = seqdevrw(rp, cmd, nbytes);
else
rp->cmd.count = dirdevrw(rp, cmd, nbytes);
rp->cmd.p = cmd;
rp->data.p = buf;
rp->data.count = nbytes;
rp->data.write = 1;
/* issue it */
if((n = SRrequest(rp)) == -1){
if (exabyte) {
fprint(2, "write error\n");
rp->status = STcheck;
return n;
}
if(rp->status != Status_SD || rp->sense[2] != Sd2eom)
return -1;
if(rp->sense[0] & Sd0valid){
n -= GETBELONG(rp->sense+3) * rp->lbsize;
rp->data.count = nbytes - n;
}
else
rp->data.count = nbytes;
n = rp->data.count;
}
rp->offset += n / rp->lbsize;
return n;
}
static int
getconfcmd(Drive *drive, uint8_t *resp, int respsz)
{
int n;
uint32_t datalen;
uint8_t cmd[10];
initcdb(cmd, sizeof cmd, Scmdgetconf);
cmd[3] = 0; /* start with profile list feature */
cmd[7] = respsz >> 8;
cmd[8] = respsz;
n = scsi(&drive->scsi, cmd, sizeof cmd, resp, respsz, Sread);
if (n < 0) {
if(vflag)
fprint(2, "get config cmd failed\n");
return -1;
}
if (n < 4)
return -1;
datalen = GETBELONG(resp+0);
if (datalen < 8)
return -1;
return datalen;
}
int32_t
SRread(ScsiReq *rp, void *buf, int32_t nbytes)
{
uint8_t cmd[10];
int32_t n;
if(rp->lbsize == 0 || (nbytes % rp->lbsize) || nbytes > Maxiosize){
if(diskdebug)
if (nbytes % rp->lbsize)
fprint(2, "disk: i/o size %ld %% %ld != 0\n",
nbytes, rp->lbsize);
else
fprint(2, "disk: i/o size %ld > %d\n",
nbytes, Maxiosize);
rp->status = Status_BADARG;
return -1;
}
/* set up scsi read cmd */
cmd[0] = ScmdRead;
if(rp->flags & Fseqdev)
rp->cmd.count = seqdevrw(rp, cmd, nbytes);
else
rp->cmd.count = dirdevrw(rp, cmd, nbytes);
rp->cmd.p = cmd;
rp->data.p = buf;
rp->data.count = nbytes;
rp->data.write = 0;
/* issue it */
n = SRrequest(rp);
if(n != -1){ /* it worked? */
rp->offset += n / rp->lbsize;
return n;
}
/* request failed; maybe we just read a short record? */
if (exabyte) {
fprint(2, "read error\n");
rp->status = STcheck;
return n;
}
if(rp->status != Status_SD || !(rp->sense[0] & Sd0valid))
return -1;
/* compute # of bytes not read */
n = GETBELONG(rp->sense+3) * rp->lbsize;
if(!(rp->flags & Fseqdev))
return -1;
/* device is a tape or something similar */
if (rp->sense[2] == Sd2filemark || rp->sense[2] == 0x08 ||
rp->sense[2] & Sd2ili && n > 0)
rp->data.count = nbytes - n;
else
return -1;
n = rp->data.count;
if (!rp->readblock++ || debug)
fprint(2, "SRread: tape data count %ld%s\n", n,
(rp->sense[2] & Sd2ili? " with ILI": ""));
rp->status = STok;
rp->offset += n / rp->lbsize;
return n;
}
