From: Hsiang Kao <hsiangkao@aol.com>
Date: Sat, 23 Sep 2017 18:45:42 +0000 (+0800)
Subject: f2fs: allow readpages with NULL file pointer
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=71cb4afff80cee2b0f0dfda32f55e4e8d4f1153d;p=openwrt%2Fstaging%2Fblogic.git

f2fs: allow readpages with NULL file pointer

Keep in line with the other Linux file system implementations
since page_cache_sync_readahead supports NULL file pointer,
and thus we can readahead data by f2fs itself without file opening
(something like the btrfs behavior).

Signed-off-by: Gao Xiang <gaoxiang25@huawei.com>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 36b535207c88..9b68fb7eb5f1 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1334,7 +1334,7 @@ static int f2fs_read_data_pages(struct file *file,
 			struct address_space *mapping,
 			struct list_head *pages, unsigned nr_pages)
 {
-	struct inode *inode = file->f_mapping->host;
+	struct inode *inode = mapping->host;
 	struct page *page = list_last_entry(pages, struct page, lru);
 
 	trace_f2fs_readpages(inode, page, nr_pages);