ksmbd: Return STATUS_OBJECT_PATH_NOT_FOUND if smb2_creat() returns ENOENT

Both Windows 10's SMB server and samba return STATUS_OBJECT_PATH_NOT_FOUND
when trying to access a nonexistent path.

This fixes Windows 10 File History tool. The latter relies on the server
returning STATUS_OBJECT_PATH_NOT_FOUND to figure out what part of the
target path needs to be created. Returning STATUS_OBJECT_NAME_INVALID
will make it stop and display an error to the user.

Signed-off-by: Marios Makassikis <mmakassikis@freebox.fr>
Signed-off-by: Namjae Jeon <namjae.jeon@samsung.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/ksmbd/smb2pdu.c

@@ -2768,8 +2768,13 @@ int smb2_open(struct ksmbd_work *work)
 	if (!file_present) {
 		rc = smb2_creat(work, &path, name, open_flags, posix_mode,
 				req->CreateOptions & FILE_DIRECTORY_FILE_LE);
-		if (rc)
+		if (rc) {
+			if (rc == -ENOENT) {
+				rc = -EIO;
+				rsp->hdr.Status = STATUS_OBJECT_PATH_NOT_FOUND;
+			}
 			goto err_out;
+		}
 
 		created = true;
 		user_ns = mnt_user_ns(path.mnt);