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

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Message-Id: <1317617837-22108-1-git-send-email-linkinjeon@gmail.com>
Date:	Mon,  3 Oct 2011 13:57:17 +0900
From:	Namjae Jeon <linkinjeon@...il.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, Namjae Jeon <linkinjeon@...il.com>
Subject: [PATCH] isofs : add readpages support for isofs. Using mpage_readpages instead of multiple calls to isofs_readpage to reduce the CPU utilization and make performance higher.

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

diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index a5d0367..46844ff 100644
--- a/fs/isofs/inode.c
+++ b/fs/isofs/inode.c
@@ -20,6 +20,7 @@
 #include <linux/statfs.h>
 #include <linux/cdrom.h>
 #include <linux/parser.h>
+#include <linux/mpage.h>
 
 #include "isofs.h"
 #include "zisofs.h"
@@ -1148,7 +1149,13 @@ struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
 
 static int isofs_readpage(struct file *file, struct page *page)
 {
-	return block_read_full_page(page,isofs_get_block);
+	return mpage_readpage(page, isofs_get_block);
+}
+
+static int isofs_readpages(struct file *file, struct address_space *mapping,
+			struct list_head *pages, unsigned nr_pages)
+{
+	return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
 }
 
 static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
@@ -1158,6 +1165,7 @@ static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
 
 static const struct address_space_operations isofs_aops = {
 	.readpage = isofs_readpage,
+	.readpages = isofs_readpages,
 	.bmap = _isofs_bmap
 };
 
-- 
1.7.4.4

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