Btrfs: fix remap_file_pages error
when we use remap_file_pages() to remap a file, remap_file_pages always return
error. It is because btrfs didn't set VM_CAN_NONLINEAR for vma.
Signed-off-by: Miao Xie <miaox@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index abcb918..ce0cd29 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -1189,8 +1189,15 @@
static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma)
{
- vma->vm_ops = &btrfs_file_vm_ops;
+ struct address_space *mapping = filp->f_mapping;
+
+ if (!mapping->a_ops->readpage)
+ return -ENOEXEC;
+
file_accessed(filp);
+ vma->vm_ops = &btrfs_file_vm_ops;
+ vma->vm_flags |= VM_CAN_NONLINEAR;
+
return 0;
}