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    SubjectRe: [PATCH] SMP race in ext2 - metadata corruption.


    On Thu, 26 Apr 2001, Linus Torvalds wrote:

    >
    >
    > On Thu, 26 Apr 2001, Alexander Viro wrote:
    > > On Thu, 26 Apr 2001, Andrea Arcangeli wrote:
    > > >
    > > > how can the read in progress see a branch that we didn't spliced yet? We
    > >
    > > fd = open("/dev/hda1", O_RDONLY);
    > > read(fd, buf, sizeof(buf));
    >
    > Note that I think all these arguments are fairly bogus. Doing things like
    > "dump" on a live filesystem is stupid and dangerous (in my opinion it is
    > stupid and dangerous to use "dump" at _all_, but that's a whole 'nother
    > discussion in itself), and there really are no valid uses for opening a
    > block device that is already mounted. More importantly, I don't think
    > anybody actually does.

    Actually I did. I might do it again :) The point was to get the kernel to
    cache certain blocks in the RAM.

    Vladimir Dergachev

    >
    > The fact that you _can_ do so makes the patch valid, and I do agree with
    > Al on the "least surprise" issue. I've already applied the patch, in fact.
    > But the fact is that nobody should ever do the thing that could cause
    > problems.
    >
    > Linus
    >
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