[patch 3/4] mm: filemap: pass __GFP_WRITE from grab_cache_page_write_begin()

Johannes Weiner
2011-09-20T13:46:20Z

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>
---
mm/filemap.c | 5 ++++-
1 files changed, 4 insertions(+), 1 deletions(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index 645a080..cf0352d 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2349,8 +2349,11 @@ 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:
@@ -2358,7 +2361,7 @@ 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,
--
1.7.6