Linux-kernel mailing list archive 1998-31,: Re: DEVFSv50 and /dev/fb? (or /dev/fb/? ???)

# Re: DEVFSv50 and /dev/fb? (or /dev/fb/? ???)

Andrea Arcangeli (arcangeli@mbox.queen.it)
Wed, 5 Aug 1998 18:01:38 +0200 (CEST)

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On Thu, 6 Aug 1998, Richard Gooch wrote:

>No, this isn't true. Think about hot-swappable discs. Think about
>PCMCIA. Think about USB. All cases where hardware is plugged in and
>out and you don't reboot the kernel.

So with devfs after you have connected a PCMCIA card, in some msec
automagically the right devfs device is added to /dev/ or /devfs/?

>Erm, if you just move all block devices into their own subdirectory,
>and assuming the bulk of /dev bloat is due to block devices
>(reasonable, when you consider the zillions of possible SCSI discs
>when we break the 16 disc limit), then searching through /dev/block is
>nearly as long as searching /dev with everything in it.

With the current inode scheme nobody force you to put all blocks device in
the same directory. I will use /tmp/myhd to be fast.

And the device-file lookup in the case of block devices is done only at
mount time (I hope to be right here ;-) so it' s really not importatnt and
it would be fast enough also with zillon of device in the same directory.
In production server I mount hd once a month (the power usually go down
once a month ;-).

Andrea[s] Arcangeli

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