fs: return -EOPNOTSUPP if clone is not supported

-EBADF is a rather confusing error if an operations is not supported,
and nfsd gets rather upset about it.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 4 insertions, 2 deletions

diff --git a/fs/read_write.c b/fs/read_write.c
index 0c8782aa3d71..dadf24e5c95b 100644
--- a/fs/read_write.c
+++ b/fs/read_write.c
@@ -1533,10 +1533,12 @@ int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
 
         if (!(file_in->f_mode & FMODE_READ) ||
             !(file_out->f_mode & FMODE_WRITE) ||
-            (file_out->f_flags & O_APPEND) ||
-            !file_in->f_op->clone_file_range)
+            (file_out->f_flags & O_APPEND))
                 return -EBADF;
 
+        if (!file_in->f_op->clone_file_range)
+                return -EOPNOTSUPP;
+
         ret = clone_verify_area(file_in, pos_in, len, false);
         if (ret)
                 return ret;