From: Johannes Weiner <jweiner@redhat.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Mel Gorman <mgorman@suse.de>, Christoph Hellwig <hch@infradead.org>,
        Dave Chinner <david@fromorbit.com>,
        Wu Fengguang <fengguang.wu@intel.com>, Jan Kara <jack@suse.cz>,
        Rik van Riel <riel@redhat.com>, Minchan Kim <minchan.kim@gmail.com>,
        Chris Mason <chris.mason@oracle.com>, "Theodore Ts'o" <tytso@mit.edu>,
        Andreas Dilger <adilger.kernel@dilger.ca>, xfs@oss.sgi.com,
        linux-btrfs@vger.kernel.org, linux-ext4@vger.kernel.org,
        linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
        linux-kernel@vger.kernel.org
Subject: [patch 3/4] mm: filemap: pass __GFP_WRITE from grab_cache_page_write_begin()
Date: Tue, 20 Sep 2011 15:45:14 +0200
Message-Id: <1316526315-16801-4-git-send-email-jweiner@redhat.com>
In-Reply-To: <1316526315-16801-1-git-send-email-jweiner@redhat.com>
References: <1316526315-16801-1-git-send-email-jweiner@redhat.com>

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