nilfs2: simplify nilfs_get_page function

Implementation of nilfs_get_page() is a bit old as below:

 - A common read_mapping_page inline function is now available instead
   of its read_cache_page use.
 - wait_on_page_locked() use in the function is eliminable since
   read_cache_page function does the same thing through wait_on_page_read().
 - PageUptodate() check is eliminable for the same reason.

This renews nilfs_get_page() based on these points.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>

diff --git a/fs/nilfs2/dir.c b/fs/nilfs2/dir.c
index 85c89df..d8d183e 100644 (file)
--- a/fs/nilfs2/dir.c
+++ b/fs/nilfs2/dir.c
@@ -199,13 +199,10 @@ fail:
 static struct page *nilfs_get_page(struct inode *dir, unsigned long n)
 {
        struct address_space *mapping = dir->i_mapping;
-       struct page *page = read_cache_page(mapping, n,
-                               (filler_t *)mapping->a_ops->readpage, NULL);
+       struct page *page = read_mapping_page(mapping, n, NULL);
+
        if (!IS_ERR(page)) {
-               wait_on_page_locked(page);
                kmap(page);
-               if (!PageUptodate(page))
-                       goto fail;
                if (!PageChecked(page))
                        nilfs_check_page(page);
                if (PageError(page))