Re: bus:id:lun to device name

[Stefan Voelkel <Stefan.Voelkel@millenux.com>]

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On Tue, 2003-07-15 at 19:03, Bryan Henderson wrote:
> 
> 
> >Theoretically /dev/foobar might be a scsi device, meaning that I
> >must/should ioctl() all files under /dev/. Thats what I do not like
> >about ioctl() :).
> 
> Once you admit that devices in Linux are not fundamentally associated with
> names in the file tree, the problem takes on a whole new perspective.

True. What I do not like about a list of devices is the fact that I will
duplicate code, eg (from sd.c)

static void sd_devname(unsigned int disknum, char *buffer)

> >> Another option is to use scsidev
> >> http://www.garloff.de/kurt/linux/scsidev/
> >> where the device nodes are dynamically created and (by default) have
> >> names which contain this information.
> >
> >AFAIR devfs does this too, depending on devfs would be an option.
> 
> [...] Or do you want the name by which people normally know and
> use the device?  E.g. "I have /dev/sda mounted, but what device is that?"

Yes, basically. I have this information: host_id:bus:target:lun, and now
I'd like the "device file name with which one normally access' this
specific lun".

Let me give you some details (hope that will make it clearer). I am
implementing FC-HBA (ftp://ftp.t11.org/t11/pub/fc/hba/03-108v2.pdf). The
problem occures with HBA_GetFcpTargetMapping() on page 73 (7.4.4), the
parameters are describerd on page 31 (6.6.1) and the specific struct is
HBA_ScsiId (6.6.1.5), actually the member OSDeviceName (6.6.2.11).

As it seems, I must use the file-name-list-ioctl() approach without
devfs and something like snprintf("/dev/scsi/host%d/bus%d/...", ...); if
devfs is mounted.

Thank you all for your time

regards
	Stefan
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Stefan Völkel                            stefan.voelkel@millenux.com
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