udf: Add readpages support for udf.

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

Signed-off-by: Namjae Jeon <linkinjeon@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>

diff --git a/fs/udf/inode.c b/fs/udf/inode.c
index 1d1358ed80c13e5da17849c7773bc8a6d1861e7c..f94d6f9febf51accc3346b54859c4d4f62aadea7 100644 (file)
--- 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,