Re: CD writing in future Linux (stirring up a hornets' nest)

[Jan Engelhardt]

>> SUSE currently does it in A Nice Way: setfacl'ing the devices to include 
>> read access for currently logged-in users. (Well, if someone logs on tty1 
>> after you, you're screwed anyway - he could have just ejected the cd when 
>> he's physically at the box.)
>
>There are some things to complicate matters. SUSE patch subfs into the
>kernel and ship the needed user-space, think of this as quick
>automounter. It releases the drive and unmounts the medium when the last
>file is closed. In older SUSE releases, tty? logins didn't trigger
>such access controls, only "desktop" logins through kdm or gdm.

I think this is independent of subfs. This is, afaicg, a resmgrd thing. And 
since I do not use [a-z]dm, but tty login + startx, well, you can 
guess.

>> Yes, the device numbering is not optimal. (I already hear someone saying 
>> 'have udev make some sweety symlink in /dev'.)
>> But in case of /dev/hd*, we are pretty sure of what device is connected 
>> where. In case of sd*, it's AFAICS not - the next device plugged in gets 
>> the next free sd slot.
>
>What matters is sg, and perhaps sr.

Where is the difference between SG_IO-on-hdx and sg0?



Jan Engelhardt
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