[Linux-Biella] udev vs devfs

[Paul TT]

Paolo Ciarrocchi wrote:
> ....
> The Problems:
>  1) A static /dev is unwieldy and big.  It would be nice to only show
>     the /dev entries for the devices we actually have running in the
>     system.
rm.... ;P
>  3) Users want a way to name devices in a persistent fashion (i.e. "This
>     disk here, must _always_ be called "boot_disk" no matter where in
>     the scsi tree I put it", or "This USB camera must always be called
>     "camera" no matter if I have other USB scsi devices plugged in or
>     not.")
>   
but users want a way also to have the system think about it, not fixed 
by the device.... ;)
> ...
>     1) devfs only shows the dev entries for the devices in the system.
>   
?????
>     3) devfs does not provide a way to name devices in a persistent
>        fashion
di suo no, ma si puo' fare ;P
>   Constraints:
>     1) devfs forces the devfs naming policy into the kernel.  If you
>        don't like this naming scheme, tough.
>     2) devfs does not follow the LSB device naming standard.
>   
questa sarebbe una cosa banalmente risolvibile eh..... ;)
>     3) devfs is small, and embedded devices use it.  However it is
>        implemented in non-pagable memory.
>
>   
>     2) udev does not care about the major/minor number schemes.  If the
>        kernel tomorrow switches to randomly assign major and minor numbers
>        to different devices, it would work just fine (this is exactly
>        what I am proposing to do in 2.7...)
>   
azz, di bene in meglio.... :(
>     4) udev emits D-BUS messages so that any other userspace program
>        (like HAL) can listen to see what devices are created or removed.
>        It also allows userspace programs to query its database to see
>        what devices are present and what they are currently named as
>        (providing a pointer into the sysfs tree for that specific device
>        node.)
>   
questo lo sapevo e mi piace :)
>   Constraints:
>     1) udev moves _all_ naming policies out of the kernel and into
>        userspace.
>   
mah, circa
invero uno poteva farsi i device che voleva anche prima.....


non voglio star qui a fare discussioni sterili su sta cosa, quando 
scrivero ' un kernel tutto mio potra' avere senso. a tutt'ora no.
udev per ora non mi piace, non vedo vantaggi, ma finora ho trovato 
invece rugne. punto.

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