Date: Sat, 19 Oct 1996 08:00:03 -0700 (PDT) From: J Wunsch <j@uriah.heep.sax.de> To: freebsd-bugs Subject: Re: kern/1839: Multiple mfs mounts of same mount point Message-ID: <199610191500.IAA07610@freefall.freebsd.org>
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The following reply was made to PR kern/1839; it has been noted by GNATS. From: J Wunsch <j@uriah.heep.sax.de> To: mark@seeware.DIALix.oz.au Cc: FreeBSD-gnats-submit@freebsd.org Subject: Re: kern/1839: Multiple mfs mounts of same mount point Date: Sat, 19 Oct 1996 16:27:11 +0200 (MET DST) 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. 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? -- cheers, J"org joerg_wunsch@uriah.heep.sax.de -- http://www.sax.de/~joerg/ -- NIC: JW11-RIPE Never trust an operating system you don't have sources for. ;-)
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