[PATCH v2] ubifs: refactor ubifs_file_mmap()

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

generic_file_mmap() set vma->vm_ops = &generic_file_vm_ops,
then ubifs_file_mmap set vma->vm_ops = &ubifs_file_vm_ops.
So it is redundant.
And there is no kind of file does not supply page reading function
in ubifs. The readpage() check up for mmap file in generic_file_mmap()
is not needed.

So remove the call of generic_file_mmap().

Change v1 -> v2:
- deleted the mapping variable
Signed-off-by: Zhang Zhen <zhenzhang.zhang@huawei.com>
---
 fs/ubifs/file.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index b5b593c..f7b6958 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1540,11 +1540,7 @@ static const struct vm_operations_struct ubifs_file_vm_ops = {

 static int ubifs_file_mmap(struct file *file, struct vm_area_struct *vma)
 {
-	int err;
-
-	err = generic_file_mmap(file, vma);
-	if (err)
-		return err;
+	file_accessed(file);
 	vma->vm_ops = &ubifs_file_vm_ops;
 	return 0;
 }
-- 
1.8.1.2


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