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    SubjectRe: invalidate_inode_pages in 2.5.32/3
    Chuck Lever wrote:
    >
    > On Thu, 5 Sep 2002, Andrew Morton wrote:
    >
    > > That all assumes SMP/preempt. If you're seeing these problems on
    > > uniproc/non-preempt then something fishy may be happening.
    >
    > sorry, forgot to mention: the system is UP, non-preemptible, high mem.
    >
    > invalidate_inode_pages isn't freeing these pages because the page count is
    > two. perhaps the page count semantics of one of the page cache helper
    > functions has changed slightly. i'm still diagnosing.
    >
    > fortunately the problem is deterministically reproducible. basic test6,
    > the readdir test, of 2002 connectathon test suite, fails -- either a
    > duplicate file entry or a missing file entry appears after some standard
    > file creation and removal processing in that directory. the incorrect
    > entries occur because the NFS client zaps the directory's page cache to
    > force the next reader to re-read the directory from the server. but
    > invalidate_inode_pages decides to leave the pages in the cache, so the
    > next reader gets stale cached data instead.

    Perhaps this explains my nfs problem. (2.5.32/33 UP, preempt, no
    highmem)
    Soemtimes, when editing a file on nfs, the file disappears
    from the server. The client believes it is there
    until an umount+mount sequence. It doesn't happen
    for all files, but it is 100% reproducible for those affected.

    Editing changes the directory when the editor makes a backup
    copy, the old directory is kept around wrongly, and so the
    save into the existing file silently fails because
    wrong directory information from cache is used?

    Helge Hafting
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