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    SubjectRe: [PATCH V3 0/8] Cleancache: overview
    On 07/23/2010 01:46 PM, Minchan Kim wrote:
    > On Fri, Jul 23, 2010 at 4:36 PM, Nitin Gupta <> wrote:
    >> 2. I think change in btrfs can be avoided by moving cleancache_get_page()
    >> from do_mpage_reapage() to filemap_fault() and this should work for all
    >> filesystems. See:
    >> handle_pte_fault() -> do_(non)linear_fault() -> __do_fault()
    >> -> vma->vm_ops->fault()
    >> which is defined as filemap_fault() for all filesystems. If some future
    >> filesystem uses its own custom function (why?) then it will have to arrange for
    >> call to cleancache_get_page(), if it wants this feature.
    > filemap fault works only in case of file-backed page which is mapped
    > but don't work not-mapped cache page. So we could miss cache page by
    > read system call if we move it into filemap_fault.

    Oh, yes. Then we need cleancache_get_page() call in do_generic_file_read() too.
    So, if I am missing anything now, we should now be able to get rid of per-fs


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