mm: filemap: pass __GFP_WRITE from grab_cache_page_write_begin()

Tell the page allocator that pages allocated through
grab_cache_page_write_begin() are expected to become dirty soon.

Signed-off-by: Johannes Weiner <jweiner@redhat.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Acked-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: Dave Chinner <david@fromorbit.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Shaohua Li <shaohua.li@intel.com>
Cc: Chris Mason <chris.mason@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 1 deletions

diff --git a/mm/filemap.c b/mm/filemap.c
index a0701e6eec10..c4ee2e918bea 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2351,8 +2351,11 @@ struct page *grab_cache_page_write_begin(struct address_space *mapping,
                                         pgoff_t index, unsigned flags)
 {
         int status;
+        gfp_t gfp_mask;
         struct page *page;
         gfp_t gfp_notmask = 0;
+
+        gfp_mask = mapping_gfp_mask(mapping) | __GFP_WRITE;
         if (flags & AOP_FLAG_NOFS)
                 gfp_notmask = __GFP_FS;
 repeat:
@@ -2360,7 +2363,7 @@ repeat:
         if (page)
                 goto found;
 
-        page = __page_cache_alloc(mapping_gfp_mask(mapping) & ~gfp_notmask);
+        page = __page_cache_alloc(gfp_mask & ~gfp_notmask);
         if (!page)
                 return NULL;
         status = add_to_page_cache_lru(page, mapping, index,