isofs: add readpages support

Use mpage_readpages() instead of multiple calls to isofs_readpage() to
reduce the CPU utilization and make performance higher.

Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Jan Kara <jack@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/fs/isofs/inode.c b/fs/isofs/inode.c
index a5d03672d04edbd76f6014124922aea631ba9ed7..46844ff39d615e4041d0d0b3d94ae442aad2d5b0 100644 (file)
--- 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
 };