On Fri, 20 Aug 2010, Wu Fengguang wrote:
> Sage,
>
> This is actually a bug fix for ceph, which missed the task_dirty_inc()
> call in account_page_dirty().
>
> Reviewed-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Thanks, I missed this one earlier. I'll queue it up.
sage
>
> On Fri, Aug 20, 2010 at 05:31:26PM +0800, Michael Rubin wrote:
> > This allows code outside of the mm core to safely manipulate page state
> > and not worry about the other accounting. Not using these routines means
> > that some code will lose track of the accounting and we get bugs. This
> > has happened once already.
> >
> > Signed-off-by: Michael Rubin <mrubin@xxxxxxxxxx>
> > ---
> > fs/ceph/addr.c | 8 +-------
> > mm/page-writeback.c | 1 +
> > 2 files changed, 2 insertions(+), 7 deletions(-)
> >
> > diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
> > index 5598a0d..420d469 100644
> > --- a/fs/ceph/addr.c
> > +++ b/fs/ceph/addr.c
> > @@ -105,13 +105,7 @@ static int ceph_set_page_dirty(struct page *page)
> > spin_lock_irq(&mapping->tree_lock);
> > if (page->mapping) { /* Race with truncate? */
> > WARN_ON_ONCE(!PageUptodate(page));
> > -
> > - if (mapping_cap_account_dirty(mapping)) {
> > - __inc_zone_page_state(page, NR_FILE_DIRTY);
> > - __inc_bdi_stat(mapping->backing_dev_info,
> > - BDI_RECLAIMABLE);
> > - task_io_account_write(PAGE_CACHE_SIZE);
> > - }
> > + account_page_dirtied(page, page->mapping);
> > radix_tree_tag_set(&mapping->page_tree,
> > page_index(page), PAGECACHE_TAG_DIRTY);
> >
> > diff --git a/mm/page-writeback.c b/mm/page-writeback.c
> > index 7262aac..9d07a8d 100644
> > --- a/mm/page-writeback.c
> > +++ b/mm/page-writeback.c
> > @@ -1131,6 +1131,7 @@ void account_page_dirtied(struct page *page, struct address_space *mapping)
> > task_io_account_write(PAGE_CACHE_SIZE);
> > }
> > }
> > +EXPORT_SYMBOL(account_page_dirtied);
> >
> > /*
> > * For address_spaces which do not use buffers. Just tag the page as dirty in
> > --
> > 1.7.1
>
>
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