Messages in this thread |  | | Subject | Re: devfs and /proc/ide/hda | From | Goswin Brederlow <> | Date | 08 Mar 2001 13:32:03 +0100 |
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>>>>> " " == AJ Lewis <lewis@sistina.com> writes:
> On Wed, Feb 28, 2001 at 04:10:23PM +0100, Guest section DW > wrote: >> On Wed, Feb 28, 2001 at 08:52:54PM +1100, Glenn McGrath wrote: >> >> > Im running kernel 2.4.1, I have entries like /proc/ide/hda, > >> /proc/ide/ide0/hda etc irrespective of wether im using devfs or >> > traditional device names. > > Is always using traditional >> device names for /proc/ide intentional, or > is it something >> nobody has gotten around to fixing yet? >> >> If only humans look at /proc, and they like typing long names, >> then there is no objection against changing /proc. As it is, >> however, quite a few programs look at /proc for information >> about devices. I don't think it would be a good idea to "fix" >> /proc and simultaneously break all these programs.
> What it should do is change based on whether devfs is mounted > or not. It doesn't make *any* sense to have > /dev/ide/host0/foo/bar in your /proc/partitions entries if you > aren't mounting devfs. The /proc/partitions entry is the only > way I know of for something like LVM to determine which devices > to scan for Volume Groups. If you can't read /proc/partitions, > it has to attempt to scan all block devices it recognizes, > regardless of whether they are actually on the system or not. > This can take several minutes.
First:
% cat /proc/partitions major minor #blocks name
3 0 20010816 ide/host0/bus0/target0/lun0/disc 3 1 192748 ide/host0/bus0/target0/lun0/part1 3 2 249007 ide/host0/bus0/target0/lun0/part2 3 3 1 ide/host0/bus0/target0/lun0/part3 3 5 289138 ide/host0/bus0/target0/lun0/part5 3 6 1951866 ide/host0/bus0/target0/lun0/part6 3 7 979933 ide/host0/bus0/target0/lun0/part7 3 8 16346106 ide/host0/bus0/target0/lun0/part8 33 0 80043264 ide/host2/bus0/target0/lun0/disc 33 1 80035798 ide/host2/bus0/target0/lun0/part1
So its already right.
Secondly with devfs, why not just scan all /dev/discs/?
% ls -l /dev/discs total 0 lr-xr-xr-x 1 root root 30 Jan 1 1970 disc0 -> ../ide/host0/bus0/target0/lun0/ lr-xr-xr-x 1 root root 30 Jan 1 1970 disc1 -> ../ide/host2/bus0/target0/lun0/
Also if lvm opens all known devices by way of /dev/whatever while scanning, it will only find existing devices there with devfs.
MfG Goswin - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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