| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/sunhe/incubator-teaclave/third_party/rust-sgx-sdk/sgx_protected_fs/tfs/src/sys/file/flush.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>flush.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../sgx_tprotected_fs/index.html"><div class="logo-container"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../../../sgx_tprotected_fs/index.html"><img class="rust-logo" src="../../../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| </pre><pre class="rust"><code><span class="comment">// Licensed to the Apache Software Foundation (ASF) under one |
| // or more contributor license agreements. See the NOTICE file |
| // distributed with this work for additional information |
| // regarding copyright ownership. The ASF licenses this file |
| // to you 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.. |
| |
| </span><span class="kw">use </span><span class="kw">crate</span>::sys::error::FsResult; |
| <span class="kw">use </span><span class="kw">crate</span>::sys::file::{FileInner, FileStatus}; |
| <span class="kw">use </span><span class="kw">crate</span>::sys::host::{<span class="self">self</span>, HostFs, RecoveryFile}; |
| <span class="kw">use </span><span class="kw">crate</span>::sys::metadata::MD_USER_DATA_SIZE; |
| <span class="kw">use </span><span class="kw">crate</span>::sys::node::FileNodeRef; |
| <span class="kw">use </span>sgx_types::error::SgxStatus; |
| <span class="kw">use </span>std::vec::Vec; |
| |
| <span class="kw">impl </span>FileInner { |
| <span class="kw">pub fn </span>flush(<span class="kw-2">&mut </span><span class="self">self</span>) -> FsResult { |
| <span class="macro">ensure!</span>(<span class="self">self</span>.status.is_ok(), <span class="macro">esgx!</span>(SgxStatus::BadStatus)); |
| |
| <span class="kw">let </span>result = <span class="self">self</span>.internal_flush(<span class="bool-val">true</span>); |
| <span class="kw">if </span>result.is_err() && <span class="self">self</span>.status.is_ok() { |
| <span class="self">self</span>.set_file_status(FileStatus::FlushError); |
| } |
| result |
| } |
| |
| <span class="kw">pub fn </span>internal_flush(<span class="kw-2">&mut </span><span class="self">self</span>, flush: bool) -> FsResult { |
| <span class="kw">if </span>!<span class="self">self</span>.need_writing { |
| <span class="kw">return </span><span class="prelude-val">Ok</span>(()); |
| } |
| |
| <span class="kw">if </span><span class="self">self</span>.is_need_write_node() { |
| <span class="self">self</span>.write_recovery_file().map_err(|error| { |
| <span class="self">self</span>.set_file_status(FileStatus::FlushError); |
| error |
| })<span class="question-mark">?</span>; |
| |
| <span class="self">self</span>.set_update_flag(flush).map_err(|error| { |
| <span class="self">self</span>.set_file_status(FileStatus::FlushError); |
| error |
| })<span class="question-mark">?</span>; |
| |
| <span class="self">self</span>.update_nodes().map_err(|error| { |
| <span class="self">self</span>.clear_update_flag(); |
| <span class="self">self</span>.set_file_status(FileStatus::FlushError); |
| error |
| })<span class="question-mark">?</span>; |
| } |
| |
| <span class="self">self</span>.update_metadata().map_err(|error| { |
| <span class="self">self</span>.clear_update_flag(); |
| <span class="self">self</span>.set_file_status(FileStatus::CryptoError); |
| error |
| })<span class="question-mark">?</span>; |
| |
| <span class="self">self</span>.write_to_disk(flush).map_err(|error| { |
| <span class="self">self</span>.set_file_status(FileStatus::WriteToDiskFailed); |
| error |
| })<span class="question-mark">?</span>; |
| |
| <span class="self">self</span>.need_writing = <span class="bool-val">false</span>; |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">pub fn </span>write_to_disk(<span class="kw-2">&mut </span><span class="self">self</span>, flush: bool) -> FsResult { |
| <span class="kw">if </span><span class="self">self</span>.is_need_write_node() { |
| <span class="kw">for </span><span class="kw-2">mut </span>node <span class="kw">in </span><span class="self">self</span>.cache.iter().filter_map(|node| { |
| <span class="kw">let </span>node = node.borrow_mut(); |
| <span class="kw">if </span>node.need_writing { |
| <span class="prelude-val">Some</span>(node) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| }) { |
| node.write_to_disk(<span class="kw-2">&mut </span><span class="self">self</span>.host_file)<span class="question-mark">?</span>; |
| } |
| <span class="self">self</span>.root_mht |
| .borrow_mut() |
| .write_to_disk(<span class="kw-2">&mut </span><span class="self">self</span>.host_file)<span class="question-mark">?</span>; |
| } |
| |
| <span class="self">self</span>.metadata.write_to_disk(<span class="kw-2">&mut </span><span class="self">self</span>.host_file)<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>flush { |
| <span class="self">self</span>.host_file.flush()<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>update_nodes(<span class="kw-2">&mut </span><span class="self">self</span>) -> FsResult { |
| <span class="comment">// 1. encrypt the changed data |
| // 2. set the KEY+GMAC in the parent MHT |
| // 3. set the need_writing flag for all the parents |
| </span><span class="kw">for </span><span class="kw-2">mut </span>data_node <span class="kw">in </span><span class="self">self</span>.cache.iter().filter_map(|node| { |
| <span class="kw">let </span>node = node.borrow_mut(); |
| <span class="kw">if </span>node.is_data() && node.need_writing { |
| <span class="prelude-val">Some</span>(node) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| }) { |
| <span class="kw">let </span>key = data_node.derive_key(<span class="kw-2">&mut </span><span class="self">self</span>.key_gen)<span class="question-mark">?</span>; |
| data_node.encrypt(<span class="kw-2">&</span>key)<span class="question-mark">?</span>; |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>parent = data_node.parent.clone(); |
| <span class="kw">while let </span><span class="prelude-val">Some</span>(mht) = parent { |
| <span class="kw">let </span><span class="kw-2">mut </span>mht = mht.borrow_mut(); |
| <span class="kw">if </span>!mht.is_root_mht() { |
| mht.need_writing = <span class="bool-val">true</span>; |
| parent = mht.parent.clone(); |
| } <span class="kw">else </span>{ |
| <span class="kw">break</span>; |
| } |
| } |
| } |
| |
| <span class="comment">// add all the mht nodes that needs writing to a list |
| </span><span class="kw">let </span><span class="kw-2">mut </span>mht_nodes = <span class="self">self |
| </span>.cache |
| .iter() |
| .filter_map(|node| { |
| <span class="kw">let </span>borrow = node.borrow(); |
| <span class="kw">if </span>borrow.is_mht() && borrow.need_writing { |
| <span class="prelude-val">Some</span>(node.clone()) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| }) |
| .collect::<Vec<FileNodeRef>>(); |
| |
| <span class="comment">// sort the list from the last node to the first (bottom layers first) |
| </span>mht_nodes.sort_by(|a, b| b.borrow().cmp(<span class="kw-2">&</span>a.borrow())); |
| |
| <span class="kw">for </span><span class="kw-2">mut </span>mht_node <span class="kw">in </span>mht_nodes.iter().map(|node| node.borrow_mut()) { |
| <span class="kw">let </span>key = mht_node.derive_key(<span class="kw-2">&mut </span><span class="self">self</span>.key_gen)<span class="question-mark">?</span>; |
| mht_node.encrypt(<span class="kw-2">&</span>key)<span class="question-mark">?</span>; |
| } |
| |
| <span class="comment">// update mht root gmac in the meta data node |
| </span><span class="kw">let </span><span class="kw-2">mut </span>root_mht = <span class="self">self</span>.root_mht.borrow_mut(); |
| <span class="kw">let </span>key = root_mht.derive_key(<span class="kw-2">&mut </span><span class="self">self</span>.key_gen)<span class="question-mark">?</span>; |
| <span class="kw">let </span>mac = root_mht.encrypt(<span class="kw-2">&</span>key)<span class="question-mark">?</span>; |
| |
| <span class="self">self</span>.metadata.encrypted_plain.mht_key = key; |
| <span class="self">self</span>.metadata.encrypted_plain.mht_gmac = mac; |
| |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>update_metadata(<span class="kw-2">&mut </span><span class="self">self</span>) -> FsResult { |
| <span class="kw">let </span>key = <span class="self">self</span>.metadata.derive_key(<span class="kw-2">&mut </span><span class="self">self</span>.key_gen)<span class="question-mark">?</span>; |
| <span class="self">self</span>.metadata.encrypt(<span class="kw-2">&</span>key) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>is_need_write_node(<span class="kw-2">&</span><span class="self">self</span>) -> bool { |
| <span class="self">self</span>.metadata.encrypted_plain.size > MD_USER_DATA_SIZE |
| && <span class="self">self</span>.root_mht.borrow().need_writing |
| } |
| |
| <span class="kw">fn </span>set_update_flag(<span class="kw-2">&mut </span><span class="self">self</span>, flush: bool) -> FsResult { |
| <span class="self">self</span>.metadata.set_update_flag(<span class="number">1</span>); |
| <span class="kw">let </span>result = <span class="self">self</span>.metadata.write_to_disk(<span class="kw-2">&mut </span><span class="self">self</span>.host_file); |
| <span class="self">self</span>.metadata.set_update_flag(<span class="number">0</span>); |
| result<span class="question-mark">?</span>; |
| |
| <span class="kw">if </span>flush { |
| <span class="self">self</span>.host_file.flush().map_err(|error| { |
| <span class="kw">let _ </span>= <span class="self">self</span>.metadata.write_to_disk(<span class="kw-2">&mut </span><span class="self">self</span>.host_file); |
| error |
| })<span class="question-mark">?</span>; |
| } |
| <span class="prelude-val">Ok</span>(()) |
| } |
| |
| <span class="kw">fn </span>clear_update_flag(<span class="kw-2">&mut </span><span class="self">self</span>) { |
| <span class="macro">assert!</span>(!<span class="self">self</span>.metadata.update_flag()); |
| <span class="kw">let _ </span>= <span class="self">self</span>.metadata.write_to_disk(<span class="kw-2">&mut </span><span class="self">self</span>.host_file); |
| <span class="kw">let _ </span>= <span class="self">self</span>.host_file.flush(); |
| } |
| |
| <span class="kw">fn </span>write_recovery_file_node(<span class="kw-2">&mut </span><span class="self">self</span>) -> FsResult { |
| <span class="kw">let </span><span class="kw-2">mut </span>file = RecoveryFile::open(<span class="kw-2">&</span><span class="self">self</span>.recovery_path)<span class="question-mark">?</span>; |
| |
| <span class="kw">for </span>node <span class="kw">in </span><span class="self">self</span>.cache.iter().filter_map(|node| { |
| <span class="kw">let </span>node = node.borrow(); |
| <span class="kw">if </span>node.need_writing && !node.new_node { |
| <span class="prelude-val">Some</span>(node) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| }) { |
| node.write_recovery_file(<span class="kw-2">&mut </span>file)<span class="question-mark">?</span>; |
| } |
| |
| <span class="kw">let </span>root_mht = <span class="self">self</span>.root_mht.borrow(); |
| <span class="kw">if </span>root_mht.need_writing && !root_mht.new_node { |
| root_mht.write_recovery_file(<span class="kw-2">&mut </span>file)<span class="question-mark">?</span>; |
| } |
| |
| <span class="self">self</span>.metadata.write_recovery_file(<span class="kw-2">&mut </span>file) |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">fn </span>write_recovery_file(<span class="kw-2">&mut </span><span class="self">self</span>) -> FsResult { |
| <span class="self">self</span>.write_recovery_file_node().map_err(|error| { |
| <span class="kw">let _ </span>= host::remove(<span class="kw-2">&</span><span class="self">self</span>.recovery_path); |
| error |
| }) |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="sgx_tprotected_fs" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
