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    SubjectRe: RFC - tree quotas for Linux (2.4.12, ext2)
    On Wed, 24 Oct 2001, Jan Kara wrote:

    > But how do you solve the following: mv <dir> <some_other_dir>
    > The parent changes. You need to go through all the subdirs of <dir> and change
    > the TID. This is really hard to get right and to avoid deadlocks
    > and races... At least it seems to me so.

    Provided you are tracking the total size in each directory, it's just a
    matter of subtracting dir's size from the old parent, and adding it to the
    new parent. (With suitable checks beforehand to avoid a result which
    exceeds quota.)


    James.
    --
    "Our attitude with TCP/IP is, `Hey, we'll do it, but don't make a big
    system, because we can't fix it if it breaks -- nobody can.'"

    "TCP/IP is OK if you've got a little informal club, and it doesn't make
    any difference if it takes a while to fix it."
    -- Ken Olson, in Digital News, 1988

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