scsi.agent trouble: load more than module per TYPE

scsi.agent trouble: load more than module per TYPE

[Michele Barbiero]

I had necessity to load two modules for TYPEÍrom (in this case,
sr_mod and sg), but the original script can't do that. I found a Ubuntu
patch for that: it corrects this behaviour. My question: why don't You
merging Ubuntu patch (or only the workaround in discussion) in official
hotplug?

http://archive.ubuntu.com/ubuntu/pool/main/h/hotplug/hotplug_0.0.20040329-22ubuntu13.diff.gz

Thank's.

-- 
« Invento ergo sum »

[G]reedy[F]ly aka Shuren @ irc.azzurra.org

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Re: scsi.agent trouble: load more than module per TYPE

[Marco d'Itri]

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On Jan 18, Michele Barbiero <michele.barbiero@gmail.com> wrote:

> I had necessity to load two modules for TYPE=cdrom (in this case,
> sr_mod and sg), but the original script can't do that. I found a Ubuntu
> patch for that: it corrects this behaviour. My question: why don't You
> merging Ubuntu patch (or only the workaround in discussion) in official
> hotplug?
Because the "official hotplug" package is dead and not actively
maintained anymore and sane distributions switched to udev.

-- 
ciao,
Marco

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Re: scsi.agent trouble: load more than module per TYPE

[Michele Barbiero]

On Wed, 18 Jan 2006 20:16:21 +0100
md@Linux.IT (Marco d'Itri) wrote:

[Cut]
> Because the "official hotplug" package is dead and not actively
> maintained anymore and sane distributions switched to udev.

It's a modules problem (hotplug), not device one (udev).

-- 
« Invento ergo sum »

[G]reedy[F]ly aka Shuren @ irc.azzurra.org

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Re: scsi.agent trouble: load more than module per TYPE

[Marco d'Itri]

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On Jan 18, Michele Barbiero <michele.barbiero@gmail.com> wrote:

> > Because the "official hotplug" package is dead and not actively
> > maintained anymore and sane distributions switched to udev.
> It's a modules problem (hotplug), not device one (udev).
It's not.

-- 
ciao,
Marco

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Re: scsi.agent trouble: load more than module per TYPE

[Patrick Mansfield]

On Wed, Jan 18, 2006 at 08:45:23PM +0100, Michele Barbiero wrote:
> On Wed, 18 Jan 2006 20:16:21 +0100
> md@Linux.IT (Marco d'Itri) wrote:
> 
> [Cut]
> > Because the "official hotplug" package is dead and not actively
> > maintained anymore and sane distributions switched to udev.
> 
> It's a modules problem (hotplug), not device one (udev).

It is a module problem solved via udev rules.

IMHO, sg should still be loaded for all scsi devices, especially for
ones that have an odd (such as enclousre or raid) or unknown type. Looks
like only SUSE does it this way.

[Yeh ... you can use sr/st/sd for SG_IO.]

[kernel udev]$ grep "sg" etc/udev/*/*  | grep modprobe
etc/udev/debian/hotplug.rules:SUBSYSTEM="scsi_device", SYSFS{type}="[235689]", RUN+="/sbin/modprobe sg"
etc/udev/redhat/udev.rules:     RUN+="/sbin/modprobe sg"
etc/udev/suse/50-udev-default.rules:SUBSYSTEM="scsi_device", ACTION="add", RUN+="/sbin/modprobe sg"

The redhat line is only for SYSFS{type}="[23689]".

Types (per scsi.h) are:

#define TYPE_DISK           0x00
#define TYPE_TAPE           0x01
#define TYPE_PRINTER        0x02
#define TYPE_PROCESSOR      0x03    /* HP scanners use this */
#define TYPE_WORM           0x04    /* Treated as ROM by our system */
#define TYPE_ROM            0x05
#define TYPE_SCANNER        0x06
#define TYPE_MOD            0x07    /* Magneto-optical disk */
#define TYPE_MEDIUM_CHANGER 0x08
#define TYPE_COMM           0x09    /* Communications device */
#define TYPE_RAID           0x0c
#define TYPE_ENCLOSURE      0x0d    /* Enclosure Services Device */
#define TYPE_RBC            0x0e

-- Patrick Mansfield


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Re: scsi.agent trouble: load more than module per TYPE

[Marco d'Itri]

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On Jan 18, Patrick Mansfield <patmans@us.ibm.com> wrote:

> IMHO, sg should still be loaded for all scsi devices, especially for
> ones that have an odd (such as enclousre or raid) or unknown type. Looks
> like only SUSE does it this way.
Nobody ever opened a bug suggesting to do it differently, so I did not
bother changing the rules used by Debian.

-- 
ciao,
Marco

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Re: scsi.agent trouble: load more than module per TYPE

[Patrick Mansfield]

On Wed, Jan 18, 2006 at 09:16:50PM +0100, Marco d'Itri wrote:
> On Jan 18, Patrick Mansfield <patmans@us.ibm.com> wrote:
> 
> > IMHO, sg should still be loaded for all scsi devices, especially for
> > ones that have an odd (such as enclousre or raid) or unknown type. Looks
> > like only SUSE does it this way.
> Nobody ever opened a bug suggesting to do it differently, so I did not
> bother changing the rules used by Debian.

If you don't want to always load sg, at least load sg if no other driver
is loaded for the scsi device. That might even be better than always
loading it (sort of force SG_IO users to use /dev/sd ...).

I don't know why sr_mod is loaded for type 3 (processor), unless you have
patched sr.c sr_probe(), sr only attaches to 5 (TYPE_ROM) and 4
(TYPE_WORM).

So use (for debian at least, not tested at all):

SUBSYSTEM="scsi_device", SYSFS{type}!="[0|1|4|5|7|14]", RUN+="/sbin/modprobe sg"

-- Patrick Mansfield


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Re: scsi.agent trouble: load more than module per TYPE

[Andrey Borzenkov]

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Hash: SHA1

On Thursday 19 January 2006 00:05, Patrick Mansfield wrote:
> On Wed, Jan 18, 2006 at 09:16:50PM +0100, Marco d'Itri wrote:
> > On Jan 18, Patrick Mansfield <patmans@us.ibm.com> wrote:
> > > IMHO, sg should still be loaded for all scsi devices, especially for
> > > ones that have an odd (such as enclousre or raid) or unknown type.
> > > Looks like only SUSE does it this way.
> >
> > Nobody ever opened a bug suggesting to do it differently, so I did not
> > bother changing the rules used by Debian.
>
> If you don't want to always load sg, at least load sg if no other driver
> is loaded for the scsi device. 

I guess it makes sense. We need handle to speak with SCSI device and sg looks 
like the right one in this case.

- -andrey
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