linux-kernel - [PATCH] fs/buffer.c: call __block_write

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Message-Id: <1287848786-13347-1-git-send-email-namhyung@gmail.com>
Date:	Sun, 24 Oct 2010 00:46:26 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Alexander Viro <viro@...iv.linux.org.uk>
Cc:	Christoph Hellwig <hch@....de>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] fs/buffer.c: call __block_write_begin() if we have page

If we have the appropriate page already, call __block_write_begin()
directly instead of releasing and regrabbing it inside of
block_write_begin().

Signed-off-by: Namhyung Kim <namhyung@...il.com>
---
 fs/buffer.c |    9 ++++-----
 1 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index 7f0b9b0..d4b3ada 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2466,11 +2466,10 @@ int nobh_write_begin(struct address_space *mapping,
 	*fsdata = NULL;
 
 	if (page_has_buffers(page)) {
-		unlock_page(page);
-		page_cache_release(page);
-		*pagep = NULL;
-		return block_write_begin(mapping, pos, len, flags, pagep,
-					 get_block);
+		ret = __block_write_begin(page, pos, len, get_block);
+		if (unlikely(ret))
+			*pagep = NULL;
+		return ret;
 	}
 
 	if (PageMappedToDisk(page))
-- 
1.7.0.4

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