linux-kernel - [patch 5/5] Btrfs: pass __GFP_WRITE for buffered write page allocations

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Message-Id: <1322055258-3254-6-git-send-email-hannes@cmpxchg.org>
Date:	Wed, 23 Nov 2011 14:34:18 +0100
From:	Johannes Weiner <hannes@...xchg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Michal Hocko <mhocko@...e.cz>,
	Christoph Hellwig <hch@...radead.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Dave Chinner <david@...morbit.com>, Jan Kara <jack@...e.cz>,
	Shaohua Li <shaohua.li@...el.com>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [patch 5/5] Btrfs: pass __GFP_WRITE for buffered write page allocations

From: Johannes Weiner <jweiner@...hat.com>

Tell the page allocator that pages allocated for a buffered write are
expected to become dirty soon.

Signed-off-by: Johannes Weiner <jweiner@...hat.com>
Reviewed-by: Rik van Riel <riel@...hat.com>
Acked-by: Mel Gorman <mgorman@...e.de>
---
 fs/btrfs/file.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index dafdfa0..d673f4a 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1081,7 +1081,7 @@ static noinline int prepare_pages(struct btrfs_root *root, struct file *file,
 again:
 	for (i = 0; i < num_pages; i++) {
 		pages[i] = find_or_create_page(inode->i_mapping, index + i,
-					       mask);
+					       mask | __GFP_WRITE);
 		if (!pages[i]) {
 			faili = i - 1;
 			err = -ENOMEM;
-- 
1.7.6.4

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