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>
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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