lkml.org 
[lkml]   [2007]   [May]   [24]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    SubjectRe: [PATCH 2/4] AFS: Add a function to excise a rejected write from the pagecache
    Date
    Andrew Morton <akpm@linux-foundation.org> wrote:

    > So my reason for asking the above is to try to find a way to make all these
    > new PG-error games just go away.

    Yeah. However, there needs to be something to cover the gap between releasing
    PG_writeback and getting PG_lock. They have to be done in that order to avoid
    deadlocking against truncate and other stuff, but that leaves a window in which
    the page appears to be in a good state - one in which prepare_write() or
    page_mkwrite() can potentially leak through.

    Nick Piggin talked about using an extra lock, but as far as I can tell, that
    just compounds the deadlock problems.

    I suppose I could leave something in page->private that indicated that the
    page was defunct, but that'd have to be done by the filesystem, probably
    before calling cancel_rejected_write().

    David
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-05-25 00:37    [W:0.021 / U:30.520 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site