Removable media behaviour

[Hervé Fache]

Mounting 'sync' makes things really slow at times. Maybe it should be
mounted with a very short flush delay (don't know whether all file
systems support that though), like 2-5 seconds, just to leave a bit of
breathing space to the kernel.

2006/4/19, Joao Pedro Clemente <jpcl at rnl.ist.utl.pt>:
>
> Hi all. I think this issue is generic to (k)Ubuntu, if you dont want to
> discuss it here, well, I've tried. (Do you think I should move it to other
> Mailing list? Which one?)
>
> I was testing the behaviour of removable media handling (usb memory pen)
> and if I would like to propose one of these things, wich I think are
> reasonable:
>
> a) that usb pen (removable media) get mounted with "sync" option. It would
> avoid data loss if the user plugs it out.
>
> if this is not reasonable because "one must educate users", then, at
> least:
>
> b) that usb pen (removable media) get synced/umounted automatically on
> user logout. There are various reasons for me to accept this one:
>  - I taugth the user that it must logout. The session ended, so its data
> must be flushed. Seems logic to me.
>  - It would solve the problem of someone logging out with an inserted pen,
> and then log in as another user. If my tests were correct, the cenario I just
> described will prevent the 2nd user to use the pen drive as it is mounted
> with 1rst user permissions.
>
> If I understood the behaviour of removable media with (k)ubuntu, it is
> now like this:
>  Step 1 - The user plugs in the memory pen.
>  Step 2 - The system detects the plug
>    -  IF there is a user "A" logged, the pen will be mounted for user "A".
>    -  IF not, the system does nothing untill some user logs in. So, when
> user logs in, the system also checks "hum, was there a media insertion
> that is unassigned? Let me assign it now to the user that is logging in"
>  Step 3 - The user logs out. System does nothing
>
> The thing is, if these steps are taken, and if some other user logs in, we
> have a problem. The problem is that the media is "assigned" to an user
> that is not the one using the machine. So, the new user:
>  - Cannot eject the cd-rom
>  - Cannot umount the pen-drive
>  - Cannot write to the currently existant pen-drive (it has no
> permissions) - actually it cannot even read the pen contents!
>  - Cannot go around this by plugging the pen out and in again, as this
> would make it lose the data (modified by the previous user) that is still
> not synced.
>
>
> Have I explained myself? Do you need me to detail the test procedure to
> reproduce this problem? Does it seem of any importance? What do you people
> think about this?
>
> Thanks for you time!
>
> --
>                                 Joao Pedro Clemente
>                                 jpcl @ rnl.ist.utl.pt
>                                         (when not working out)
>                                         (when not sleeping)
>                                         (when not surfing)
>                                         (when not ... ;)
>
>
>
>
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> kubuntu-devel mailing list
> kubuntu-devel at lists.ubuntu.com
> https://lists.ubuntu.com/mailman/listinfo/kubuntu-devel
>


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