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    SubjectRe: [BK PATCH] Add ext3 indexed directory (htree) support
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    On September 28, 2002 07:13, Theodore Ts'o wrote:
    > I've been able to replicate it now fairly reliably, with the attached
    > shell script and 2.4.19 with the 2.4.19-2 dxdir patch.
    Yes, that was what I'm using

    > It appears to
    > be somewhat timing dependent, as where the directory corruption occurs
    > is not consistent, but I believe it is in the split code. Since
    > e2fsck -fD packs all of the directories completely, it means that any
    > attempt to add a file to directory will guarantee at least one split,
    > and possibly two levels of tree splits. Since the -D option to e2fsck
    > has only been relatively recently been available, I believe this is
    > why it hasn't been noticed up until now in the testing; directories
    > which are indexed "naturally" as they grow don't appear to trigger the
    > problem, or are very, very unlikely to trigger the problem. (One
    > potential avenue for exploration is that -D option perfectly sorts all
    > of the directory entries in hash order, which doesn't normally occur
    > for naturally grown directories, and this may be triggering a
    > fencepost error in the split code.)
    Yes, running fsck -D seemed to make my loopback filesystem more brittle. I
    have triggered corruption without fsck, but it's much more difficult. That
    seems to match your description of the problem.

    - -Ryan
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