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    SubjectRe: RFC: [PATCH-2.6] Add helper function to lock multiple page cache pages.
    Anton Altaparmakov <aia21@cam.ac.uk> wrote:
    >
    > Below is a patch which adds a function
    > mm/filemap.c::find_or_create_pages(), locks a range of pages. Please see
    > the function description in the patch for details.

    This isn't very nice, is it, really? Kind of a square peg in a round hole.

    If you took the approach of defining a custom file_operations.write() then
    I'd imagine that the write() side of things would fall out fairly neatly:
    no need for s_umount and i_sem needs to be taken anyway. No trylocking.

    And for the vmscan->writepage() side of things I wonder if it would be
    possible to overload the mapping's ->nopage handler. If the target page
    lies in a hole, go off and allocate all the necessary pagecache pages, zero
    them, mark them dirty?
    -
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