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// Copyright 2021 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package lisafs (LInux SAndbox FileSystem) defines the protocol for
// filesystem RPCs between an untrusted Sandbox (client) and a trusted
// filesystem server.
//
// Lock ordering:
//
// Server.renameMu
// Node.opMu
// Node.childrenMu
// Node.controlFDsMu
//
// Locking rules:
// - Node.childrenMu can be simultaneously held on multiple nodes, ancestors
// before descendants.
// - Node.opMu can be simultaneously held on multiple nodes, ancestors before
// descendants.
// - Node.opMu can be simultaneously held on two nodes that do not have an
// ancestor-descendant relationship. One node must be an internal (directory)
// node and the other a leaf (non-directory) node. Directory must be locked
// before non-directories.
// - "Ancestors before descendants" requires that Server.renameMu is locked to
// ensure that this ordering remains satisfied.
package lisafs
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