lkml.org 
[lkml]   [2006]   [Oct]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    SubjectRe: [patch 6/6] mm: fix pagecache write deadlocks
    From
    Date
    On Sat, 2006-10-14 at 06:19 +0200, Nick Piggin wrote:
    > On Fri, Oct 13, 2006 at 03:14:57PM -0700, Andrew Morton wrote:
    > > On Fri, 13 Oct 2006 18:44:52 +0200 (CEST)
    > > Nick Piggin <npiggin@suse.de> wrote:

    > > > @@ -2450,6 +2436,7 @@ int nobh_truncate_page(struct address_sp
    > > > memset(kaddr + offset, 0, PAGE_CACHE_SIZE - offset);
    > > > flush_dcache_page(page);
    > > > kunmap_atomic(kaddr, KM_USER0);
    > > > + SetPageUptodate(page);
    > > > set_page_dirty(page);
    > > > }
    > > > unlock_page(page);
    > >
    > > I've already forgotten why this was added. Comment, please ;)
    >
    > Well, nobh_prepare_write no longer sets it uptodate, so we need to if
    > we're going to set_page_dirty. OTOH, why does truncate_page need to
    > zero the pagecache anyway? I wonder if we couldn't delete this whole
    > function? (not in this patchset!)

    It zeros the tail end of the page so we don't leak old data?

    -
    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: 2006-10-15 13:41    [W:0.034 / U:2.988 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site