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 a275cbe..3b1dea5 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1331,7 +1331,7 @@ 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);