Messages in this thread | | | Date | Sun, 24 Mar 2002 17:08:43 -0700 | From | Richard Gooch <> | Subject | Re: devfs mounted twice in linux 2.4.19-pre3 |
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Hi, Al. What is the intended behaviour of MNT_DETACH wrt. /proc/mounts? It appears that detaching a FS leaves behind an apparently stale entry in /proc/mounts. Is this intentional?
This question came up after the following exchange:
I wrote: > Felix Braun writes: > > Hi Richard, > > > > I just noticed that devfs is listed twice in /proc/mounts in linux > > 2.4.19-pre3, which confuses my shutdown script. Under 2.4.19-pre my > > /proc/mounts looks like this: > > > > devfs /dev devfs rw 0 0 > > /dev/ide/host0/bus0/target0/lun0/part5 / reiserfs rw 0 0 > > none /dev devfs rw 0 0 > > /proc /proc proc rw 0 0 > > /dev/discs/disc0/part1 /dos vfat rw 0 0 > > /dev/discs/disc0/part9 /opt reiserfs rw,noatime 0 0 > > none /dev/pts devpts rw 0 0 > > /dev/discs/disc0/part7 /usr reiserfs rw 0 0 > > none /dev/shm tmpfs rw 0 0 > > > > whereas under 2.4.18 the first line didn't show up. Is that a > > misconfiguration on my part? > > No, this is due to a change in the kernel (presumably done by Al). > What seems to be happening is that the kernel temporarily mounts devfs > and then detaches it again using MNT_DETACH (actually, you need > 2.4.19-pre3-ac2 to get the fix that adds MNT_DETACH). However, > detached filesystems still appear to be listed in /proc/mounts. > Arguably, this is incorrect. > > If you were to reboot single-user, and with devfs=nomount, inspection > of /proc/mounts would show the line: > devfs /dev devfs rw 0 0 > > However, if you listed /dev, you would see that it doesn't actually > contain a devfs. Thus, /proc/mounts is deceiving you. > > Al: what is the intended behaviour of MNT_DETACH wrt. /proc/mounts?
Regards,
Richard.... Permanent: rgooch@atnf.csiro.au Current: rgooch@ras.ucalgary.ca - 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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