Date: Sat, 19 Oct 1996 17:00:02 -0700 (PDT) From: Mark Hannon <mark@seeware.DIALix.oz.au> To: freebsd-bugs Subject: Re: kern/1839: Multiple mfs mounts of same mount point Message-ID: <199610200000.RAA21535@freefall.freebsd.org>
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The following reply was made to PR kern/1839; it has been noted by GNATS. From: Mark Hannon <mark@seeware.DIALix.oz.au> To: joerg_wunsch@uriah.heep.sax.de (Joerg Wunsch) Cc: mark@seeware.DIALix.oz.au, FreeBSD-gnats-submit@freebsd.org Subject: Re: kern/1839: Multiple mfs mounts of same mount point Date: Sun, 20 Oct 1996 09:16:38 +1000 > As mark@seeware.DIALix.oz.au wrote: > > > FreeBSD-2.1.5, mount behaves very strangely, after making a mistake > > in my fstab and running mount -av several times I get the following: > > > > putte:~# df > > Filesystem 1K-blocks Used Avail Capacity Mounted on > > /dev/wd0a 29727 13729 13620 50% / > > mfs:18 7199 7 6617 0% /tmp > > /dev/wd0s1g 347647 216884 102952 68% /home > > /dev/wd0s1e 98479 69336 21265 77% /usr > > /dev/wd0s1f 297423 163296 110334 60% /usr/local > > /dev/wd0s1h 48463 1314 43272 3% /var > > procfs 4 4 0 100% /proc > > doorway:/var/mail 78975 23927 48730 33% /var/mail > > /dev/matcd0a 650002 650002 0 100% /cdrom > > mfs:2912 7199 1 6623 0% /tmp > > doorway:/var/mail 78975 23927 48730 33% /var/mail > > mfs:2923 7199 1 6623 0% /tmp > > doorway:/var/mail 78975 23927 48730 33% /var/mail > > doorway:/var/mail 78975 23927 48730 33% /var/mail > > mfs:2974 7199 1 6623 0% /tmp > > mfs:2986 7199 1 6623 0% /tmp > > doorway:/var/mail 78975 23927 48730 33% /var/mail > > That's natural. Basically, you've got what you've been asking for... > You can mount a new instance of something over the old mountpoint. (I > think you can't mount a disk partition more than once, since it's > simply busy afterwards, but for NFS and MFS, they will be mounted > again and again.) > > You should be able to umount them in reverse order. > Must admit that I didn't try this. > If the above is your entire problem, i'd consider it a pilot error, > and not a bug. Well, maybe the semantics of `mount -a' should be > changed from `try to mount everything you find in /etc/fstab' to `try > to mount everything in /etc/fstab unless it's already mounted'. > > Opinions? > At least to my way of thinking the command semantics should be to mount everything that isn't already mounted - I use the command if I ever update fstab with several changes - it that case what I really want is an update of the mount state - perhaps a different flag?? In any case not a big issue - perhaps all that needs to be done is to add some text to the mountd man page. Rgds/mark -- +-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+ | Mark Hannon,| FreeBSD, Free Unix for your PC | mark@seeware.DIALix.oz.au| | Melbourne, | PGP key available by fingering | epamha@epa.ericsson.se | | Australia | seeware@melbourne.DIALix.oz.au | | +-=-=-=-=-=-=-+-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-+
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