[PATCH v2] ext4: remove readpage() check up for mmap file

[Zhang Zhen <zhenzhang.zhang@huawei.com>]

There is no kind of file does not supply page reading function.

Change v1 -> v2:
- deleted the mapping variable

Signed-off-by: Zhang Zhen <zhenzhang.zhang@huawei.com>
---
 fs/ext4/file.c | 4 ----
 1 file changed, 4 deletions(-)

diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 8695f70..aca7b24 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -200,10 +200,6 @@ static const struct vm_operations_struct ext4_file_vm_ops = {

 static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
-	struct address_space *mapping = file->f_mapping;