locks: let the caller free file_lock on ->setlease failure

The caller allocated it, the caller should free it.

The only issue so far is that we could change the flp pointer even on an
error return if the fl_change callback failed. But we can simply move
the flp assignment after the fl_change invocation, as the callers don't
care about the flp return value if the setlease call failed.

Signed-off-by: Christoph Hellwig <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

fs/cifs/cifsfs.c

···
 		   knows that the file won't be changed on the server
 		   by anyone else */
 		return generic_setlease(file, arg, lease);
-	else {
-		if (arg != F_UNLCK)
-			locks_free_lock(*lease);
+	else
 		return -EAGAIN;
-	}
 }
 
 struct file_system_type cifs_fs_type = {

fs/gfs2/file.c

···
 
 static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
 {
-	if (arg != F_UNLCK)
-		locks_free_lock(*fl);
 	return -EINVAL;
 }
 

fs/locks.c

···
 		goto out;
 
 	if (my_before != NULL) {
-		*flp = *my_before;
 		error = lease->fl_lmops->fl_change(my_before, arg);
+		if (!error)
+			*flp = *my_before;
 		goto out;
 	}
 
···
 	return 0;
 
 out:
-	if (arg != F_UNLCK)
-		locks_free_lock(lease);
 	return error;
 }
 EXPORT_SYMBOL(generic_setlease);
···
 	}
 	lock_flocks();
 	error = __vfs_setlease(filp, arg, &fl);
-	if (error)
-		goto out_unlock;
+	if (error) {
+		unlock_flocks();
+		locks_free_lock(fl);
+		goto out_free_fasync;
+	}
 
 	/*
 	 * fasync_insert_entry() returns the old entry if any.
···
 		fl->fl_type = F_UNLCK | F_INPROGRESS;
 		fl->fl_break_time = jiffies - 10;
 		time_out_leases(inode);
-		goto out_unlock;
+	} else {
+		error = __f_setown(filp, task_pid(current), PIDTYPE_PID, 0);
 	}
-
-	error = __f_setown(filp, task_pid(current), PIDTYPE_PID, 0);
-out_unlock:
 	unlock_flocks();
+
+out_free_fasync:
 	if (new)
 		fasync_free(new);
 	return error;

fs/nfs/file.c

···
 	dprintk("NFS: setlease(%s/%s, arg=%ld)\n",
 			file->f_path.dentry->d_parent->d_name.name,
 			file->f_path.dentry->d_name.name, arg);
-	if (arg != F_UNLCK)
-		locks_free_lock(*fl);
 	return -EINVAL;
 }

fs/nfsd/nfs4state.c

···
 	if ((status = vfs_setlease(fl->fl_file, fl->fl_type, &fl))) {
 		dprintk("NFSD: setlease failed [%d], no delegation\n", status);
 		dp->dl_flock = NULL;
+		locks_free_lock(fl);
 		unhash_delegation(dp);
 		flag = NFS4_OPEN_DELEGATE_NONE;
 		goto out;