Messages in this thread |  | | Subject | Re: PROBLEM: multiple mount of devices possible 2.4.0-test1 - 2.4.0-test13-pre4 | Date | Sun, 31 Dec 2000 03:18:21 +0000 (UTC) | From | (Ton Hospel) |
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In article <Pine.GSO.4.21.0012301829190.4082-100000@weyl.math.psu.edu>, Alexander Viro <viro@math.psu.edu> writes: > On Sat, 30 Dec 2000, Ton Hospel wrote: > >> It should still need a special flag or something, since it's >> impossible for userspace to check this atomically. > > To check _what_? Having the same tree mounted in several places is > allowed. End of story. Atomicity of any kind is a non-issue - if you > have processes that do not cooperate and do random mounts you are > getting exactly what you are asking for. >
I wasn't talking about mounting the same device on different mount points. If you ask for that, it's good that you nowadays you can get that (though even there it might be a good idea to let the filesystem say if it can support that or not)
I was talking about avoiding that the same device gets multiple mounted at the SAME place, e.g. when doing mount -a, which is often used as a quick way to get the new entries in /etc/fstab
That would also be no problem if there were a standard about e.g. always flocking /etc/mtab. But as far as I know there isn't such a standard. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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