[lkml]   [2007]   [Oct]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: msync(2) bug(?), returns AOP_WRITEPAGE_ACTIVATE to userland

    On 10/15/07, Erez Zadok <> wrote:
    > Pekka, with a small change to your patch (to handle time-based cache
    > coherency), your patch worked well and passed all my tests. Thanks.
    > So now I wonder if we still need the patch to prevent AOP_WRITEPAGE_ACTIVATE
    > from being returned to userland. I guess we still need it, b/c even with
    > your patch, generic_writepages() can return AOP_WRITEPAGE_ACTIVATE back to
    > the VFS and we need to ensure that doesn't "leak" outside the kernel.

    I wonder whether _not setting_ BDI_CAP_NO_WRITEBACK implies that
    ->writepage() will never return AOP_WRITEPAGE_ACTIVATE for
    !wbc->for_reclaim case which would explain why we haven't hit this bug
    before. Hugh, Andrew?

    And btw, I think we need to fix ecryptfs too.

    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2007-10-15 13:51    [W:0.026 / U:7.596 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site