lockd: set fl_owner when unlocking files

Unlocking a POSIX lock on an inode with vfs_lock_file only works if
the owner matches. Ensure we set it in the request.

Cc: J. Bruce Fields <bfields@fieldses.org>
Fixes: 7f024fc ("Keep read and write fds with each nlm_file")
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>

fs/lockd/svcsubs.c

@@ -176,14 +176,15 @@ nlm_delete_file(struct nlm_file *file)
 	}
 }
 
-static int nlm_unlock_files(struct nlm_file *file)
+static int nlm_unlock_files(struct nlm_file *file, fl_owner_t owner)
 {
 	struct file_lock lock;
 
 	locks_init_lock(&lock);
 	lock.fl_type  = F_UNLCK;
 	lock.fl_start = 0;
 	lock.fl_end   = OFFSET_MAX;
+	lock.fl_owner = owner;
 	if (file->f_file[O_RDONLY] &&
 	    vfs_lock_file(file->f_file[O_RDONLY], F_SETLK, &lock, NULL))
 		goto out_err;
@@ -225,7 +226,7 @@ nlm_traverse_locks(struct nlm_host *host, struct nlm_file *file,
 		if (match(lockhost, host)) {
 
 			spin_unlock(&flctx->flc_lock);
-			if (nlm_unlock_files(file))
+			if (nlm_unlock_files(file, fl->fl_owner))
 				return 1;
 			goto again;
 		}