Messages in this thread |  | | From | Andreas Dilger <> | Date | Wed, 19 Sep 2001 17:16:43 -0600 | Subject | Re: Request: removal of fs/fs.h/super_block.u to enable partition |
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On Sep 19, 2001 22:52 +0100, Alan Cox wrote: > Apart from the fact that the interface is source level you already can > distribute, compile and merge file systems without patching the kernel. > > It seems to be a user space issue not a kernel one. Your app can amend > /etc/mtab when it creates and shuts down.
Well, in recent versions of e2fsprogs it prefers to check /proc/mounts over /etc/mtab to determine if a device is in-use, because the latter can be incorrect after a crash, and the root filesystem is read-only at this time. There was recently a bug report about this from Slackware users, where fsck is run on all of the filesystems before root is remounted rw. As a result, there is now even extra checking to see if the devno of the mountpoint == devno of the device, otherwise it assumes the /etc/mtab entry is bogus.
On most other systems, root is remounted rw before non-root filesystems are checked, and /etc/mtab could be assumed to be correct, but it will never be checked if /proc/mounts exists.
Cheers, Andreas -- Andreas Dilger \ "If a man ate a pound of pasta and a pound of antipasto, \ would they cancel out, leaving him still hungry?" http://www-mddsp.enel.ucalgary.ca/People/adilger/ -- Dogbert
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