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    SubjectRe: VM subsystem bug in 2.4.0 ?


    On 9 Jan 2001, Christoph Rohland wrote:

    > Hi Stephen,
    >
    > On Tue, 9 Jan 2001, Stephen C. Tweedie wrote:
    > > D'oh, right --- so can't you lock a segment just by bumping
    > > page_count on its pages?
    >
    > Looks like a good idea.
    >
    > Oh, and my last posting was partly bogus: I can directly get the pages
    > with page cache lookups on the file.

    Even more appropriately, you have the inode->i_mapping lists that you can
    use directly (no need to do lookups, just walk the list).

    Note that bumping the counts is _NOT_ as easy as you seem to think. The
    problem: vmtruncate() and friends. It's much easier to just have a flag
    that gets cleared on truncate.

    Linus

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