> > On Tue, Nov 3, 2009 at 9:34 AM, Derek Broughton

> > Translation - I don‘t know either... lol

> Actually, I‘d already said that - and suggested "raw" as a

> wild guess. But

> I was intrigued that Detlef thought that knowing what it stood

> for would

> prevent errors, since I really can‘t imagine how most of us

> would need to

> know it.

> --

> derek

>

> And knowing the acronym definitions probably won‘t help the learning

> too much, either.

> But, according to the Linux SCSI sub-system documentation I have, it

> would have to stand for _SCSI_ _READ_ since it is a cd drive that is

> designated read-only. For generic operations on the same device, it

> would map to sg0 (_SCSI_ _GENERIC_)in order to gain the write perm.

> Apparently all of the devices like /dev/sr0, /dev/st0, /dev/nst0x map

> to an sg device for generic operations.

> Although _raw_ seems to be a good logical choice.

Lo?c had it right.

But you should read the code from orbit. It‘s the only way to make sure.

>From a 2.4 kernel source

drivers/scsi/sd.c

staticstruct Scsi_Device_Template sd_template = {

name:"disk",

tag:"sd",

scsi_type:TYPE_DISK, <== "d" for disk

major:SCSI_DISK0_MAJOR,

/*

* Secondary range of majors that this driver handles.

*/

min_major:SCSI_DISK1_MAJOR,

max_major:SCSI_DISK7_MAJOR,

blk:1,

detect:sd_detect,

init:sd_init,

finish:sd_finish,

attach:sd_attach,

detach:sd_detach,

init_command:sd_init_command,

};

drivers/scsi/st.c

staticstruct Scsi_Device_Template st_template =

{

name:"tape",

tag:"st",

scsi_type:TYPE_TAPE, <== "t" for tape

major:SCSI_TAPE_MAJOR,

detect:st_detect,

init:st_init,

attach:st_attach,

detach:st_detach

};

drivers/scsi/sr.c

staticstruct Scsi_Device_Template sr_template =

{

name:"cdrom",

tag:"sr",

scsi_type:TYPE_ROM, <== "r" for ROM

major:SCSI_CDROM_MAJOR,

blk:1,

detect:sr_detect,

init:sr_init,

finish:sr_finish,

attach:sr_attach,

detach:sr_detach,

init_command:sr_init_command

};

>From a 2.6 kernel source

drivers/scsi/sr.c

MODULE_DESCRIPTION("SCSI cdrom (sr) driver");

MODULE_LICENSE("GPL");

MODULE_ALIAS_BLOCKDEV_MAJOR(SCSI_CDROM_MAJOR);

MODULE_ALIAS_SCSI_DEVICE(TYPE_ROM);

MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);

--

ubuntu-users mailing list

Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-users