linux-kernel - [PATCH 2/2] udf : add readpages support for udf. Using mpage_readpages instead of multiple calls to udf_readpage to reduce the CPU utilization and make performance higher.

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Message-Id: <1317617764-22071-1-git-send-email-linkinjeon@gmail.com>
Date:	Mon,  3 Oct 2011 13:56:04 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	jack@...e.cz
Cc:	linux-kernel@...r.kernel.org, Namjae Jeon <linkinjeon@...il.com>
Subject: [PATCH 2/2] udf : add readpages support for udf. Using mpage_readpages instead of multiple calls to udf_readpage to reduce the CPU utilization and make performance higher.

Signed-off-by: Namjae Jeon <linkinjeon@...il.com>
---
 fs/udf/inode.c |   10 +++++++++-
 1 files changed, 9 insertions(+), 1 deletions(-)

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 58665ce..81f9ce1 100644
--- a/fs/udf/inode.c
+++ b/fs/udf/inode.c
@@ -37,6 +37,7 @@
 #include <linux/writeback.h>
 #include <linux/slab.h>
 #include <linux/crc-itu-t.h>
+#include <linux/mpage.h>
 
 #include "udf_i.h"
 #include "udf_sb.h"
@@ -104,7 +105,13 @@ static int udf_writepage(struct page *page, struct writeback_control *wbc)
 
 static int udf_readpage(struct file *file, struct page *page)
 {
-	return block_read_full_page(page, udf_get_block);
+	return mpage_readpage(page, udf_get_block);
+}
+
+static int udf_readpages(struct file *file, struct address_space *mapping,
+			struct list_head *pages, unsigned nr_pages)
+{
+	return mpage_readpages(mapping, pages, nr_pages, udf_get_block);
 }
 
 static int udf_write_begin(struct file *file, struct address_space *mapping,
@@ -139,6 +146,7 @@ static sector_t udf_bmap(struct address_space *mapping, sector_t block)
 
 const struct address_space_operations udf_aops = {
 	.readpage	= udf_readpage,
+	.readpages	= udf_readpages,
 	.writepage	= udf_writepage,
 	.write_begin		= udf_write_begin,
 	.write_end		= generic_write_end,
-- 
1.7.4.4

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