Mercurial > hg
annotate rust/hg-core/src/dirstate_tree/on_disk.rs @ 47283:2a9ddc8094c7
dirstate-v2: Change the on-disk format to be tree-shaped
Nodes are stored not only for tracked files but also for their ancestor
directories. A node has "pointers" (byte count from the start of the file)
to its direct child nodes. Everything can be accessed with zero copy.
Differential Revision: https://phab.mercurial-scm.org/D10722
author | Simon Sapin <simon.sapin@octobus.net> |
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date | Wed, 19 May 2021 13:15:00 +0200 |
parents | 1766130fe9ba |
children | 73f23e7610f8 |
rev | line source |
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47283
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1 //! The "version 2" disk representation of the dirstate |
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2 //! |
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3 //! # File format |
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4 //! |
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5 //! The file starts with a fixed-sized header, whose layout is defined by the |
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6 //! `Header` struct. Its `root` field contains the slice (offset and length) to |
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7 //! the nodes representing the files and directories at the root of the |
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8 //! repository. Each node is also fixed-size, defined by the `Node` struct. |
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9 //! Nodes in turn contain slices to variable-size paths, and to their own child |
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10 //! nodes (if any) for nested files and directories. |
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11 |
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12 use crate::dirstate::parsers::clear_ambiguous_mtime; |
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13 use crate::dirstate::parsers::Timestamp; |
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14 use crate::dirstate_tree::dirstate_map::{self, DirstateMap}; |
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15 use crate::dirstate_tree::path_with_basename::WithBasename; |
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16 use crate::errors::HgError; |
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17 use crate::utils::hg_path::HgPath; |
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18 use crate::DirstateEntry; |
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19 use crate::DirstateError; |
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20 use crate::DirstateParents; |
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21 use bytes_cast::unaligned::{I32Be, U32Be, U64Be}; |
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22 use bytes_cast::BytesCast; |
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23 use std::borrow::Cow; |
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24 use std::convert::{TryFrom, TryInto}; |
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25 |
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26 /// Added at the start of `.hg/dirstate` when the "v2" format is used. |
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27 /// This a redundant sanity check more than an actual "magic number" since |
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28 /// `.hg/requires` already governs which format should be used. |
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29 pub const V2_FORMAT_MARKER: &[u8; 12] = b"dirstate-v2\n"; |
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30 |
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31 #[derive(BytesCast)] |
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32 #[repr(C)] |
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33 struct Header { |
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34 marker: [u8; V2_FORMAT_MARKER.len()], |
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35 |
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36 /// `dirstatemap.parents()` in `mercurial/dirstate.py` relies on this |
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37 /// `parents` field being at this offset, immediately after `marker`. |
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38 parents: DirstateParents, |
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39 |
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40 root: ChildNodes, |
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41 nodes_with_entry_count: Size, |
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42 nodes_with_copy_source_count: Size, |
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43 } |
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44 |
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45 #[derive(BytesCast)] |
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46 #[repr(C)] |
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47 struct Node { |
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48 full_path: PathSlice, |
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49 |
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50 /// In bytes from `self.full_path.start` |
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51 base_name_start: Size, |
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52 |
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53 copy_source: OptPathSlice, |
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54 entry: OptEntry, |
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55 children: ChildNodes, |
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56 tracked_descendants_count: Size, |
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57 } |
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58 |
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59 /// Either nothing if `state == b'\0'`, or a dirstate entry like in the v1 |
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60 /// format |
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61 #[derive(BytesCast)] |
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62 #[repr(C)] |
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63 struct OptEntry { |
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64 state: u8, |
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65 mode: I32Be, |
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66 mtime: I32Be, |
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67 size: I32Be, |
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68 } |
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69 |
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70 /// Counted in bytes from the start of the file |
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71 /// |
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72 /// NOTE: If we decide to never support `.hg/dirstate` files larger than 4 GiB |
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73 /// we could save space by using `U32Be` instead. |
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74 type Offset = U64Be; |
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75 |
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76 /// Counted in number of items |
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77 /// |
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78 /// NOTE: not supporting directories with more than 4 billion direct children, |
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79 /// or filenames more than 4 GiB. |
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80 type Size = U32Be; |
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81 |
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82 /// Location of consecutive, fixed-size items. |
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83 /// |
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84 /// An item can be a single byte for paths, or a struct with |
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85 /// `derive(BytesCast)`. |
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86 #[derive(BytesCast, Copy, Clone)] |
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87 #[repr(C)] |
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88 struct Slice { |
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89 start: Offset, |
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90 len: Size, |
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91 } |
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92 |
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93 /// A contiguous sequence of `len` times `Node`, representing the child nodes |
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94 /// of either some other node or of the repository root. |
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95 /// |
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96 /// Always sorted by ascending `full_path`, to allow binary search. |
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97 /// Since nodes with the same parent nodes also have the same parent path, |
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98 /// only the `base_name`s need to be compared during binary search. |
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99 type ChildNodes = Slice; |
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100 |
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101 /// A `HgPath` of `len` bytes |
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102 type PathSlice = Slice; |
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103 |
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104 /// Either nothing if `start == 0`, or a `HgPath` of `len` bytes |
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105 type OptPathSlice = Slice; |
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106 |
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107 /// Make sure that size-affecting changes are made knowingly |
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108 fn _static_assert_size_of() { |
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109 let _ = std::mem::transmute::<Header, [u8; 72]>; |
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110 let _ = std::mem::transmute::<Node, [u8; 57]>; |
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111 } |
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112 |
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113 pub(super) fn read<'on_disk>( |
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114 on_disk: &'on_disk [u8], |
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115 ) -> Result<(DirstateMap<'on_disk>, Option<DirstateParents>), DirstateError> { |
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116 if on_disk.is_empty() { |
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117 return Ok((DirstateMap::empty(on_disk), None)); |
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118 } |
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119 let (header, _) = Header::from_bytes(on_disk) |
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120 .map_err(|_| HgError::corrupted("truncated dirstate-v2"))?; |
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121 let Header { |
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122 marker, |
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123 parents, |
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124 root, |
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125 nodes_with_entry_count, |
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126 nodes_with_copy_source_count, |
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127 } = header; |
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128 if marker != V2_FORMAT_MARKER { |
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129 return Err(HgError::corrupted("missing dirstated-v2 marker").into()); |
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130 } |
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131 let dirstate_map = DirstateMap { |
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132 on_disk, |
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133 root: read_nodes(on_disk, *root)?, |
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134 nodes_with_entry_count: nodes_with_entry_count.get(), |
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135 nodes_with_copy_source_count: nodes_with_copy_source_count.get(), |
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136 }; |
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137 let parents = Some(parents.clone()); |
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138 Ok((dirstate_map, parents)) |
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139 } |
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140 |
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141 impl Node { |
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142 pub(super) fn path<'on_disk>( |
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143 &self, |
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144 on_disk: &'on_disk [u8], |
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145 ) -> Result<dirstate_map::NodeKey<'on_disk>, HgError> { |
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146 let full_path = read_hg_path(on_disk, self.full_path)?; |
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147 let base_name_start = usize::try_from(self.base_name_start.get()) |
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148 // u32 -> usize, could only panic on a 16-bit CPU |
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149 .expect("dirstate-v2 base_name_start out of bounds"); |
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150 if base_name_start < full_path.len() { |
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151 Ok(WithBasename::from_raw_parts(full_path, base_name_start)) |
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152 } else { |
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153 Err(HgError::corrupted( |
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154 "dirstate-v2 base_name_start out of bounds", |
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155 )) |
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156 } |
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157 } |
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158 |
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159 pub(super) fn copy_source<'on_disk>( |
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160 &self, |
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161 on_disk: &'on_disk [u8], |
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162 ) -> Result<Option<Cow<'on_disk, HgPath>>, HgError> { |
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163 Ok(if self.copy_source.start.get() != 0 { |
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164 Some(read_hg_path(on_disk, self.copy_source)?) |
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165 } else { |
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166 None |
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167 }) |
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168 } |
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169 |
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170 pub(super) fn entry(&self) -> Result<Option<DirstateEntry>, HgError> { |
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171 Ok(if self.entry.state != b'\0' { |
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172 Some(DirstateEntry { |
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173 state: self.entry.state.try_into()?, |
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174 mode: self.entry.mode.get(), |
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175 mtime: self.entry.mtime.get(), |
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176 size: self.entry.size.get(), |
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177 }) |
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178 } else { |
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179 None |
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180 }) |
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181 } |
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182 |
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183 pub(super) fn to_in_memory_node<'on_disk>( |
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184 &self, |
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185 on_disk: &'on_disk [u8], |
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186 ) -> Result<dirstate_map::Node<'on_disk>, HgError> { |
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187 Ok(dirstate_map::Node { |
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188 children: read_nodes(on_disk, self.children)?, |
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189 copy_source: self.copy_source(on_disk)?, |
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190 entry: self.entry()?, |
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191 tracked_descendants_count: self.tracked_descendants_count.get(), |
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192 }) |
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193 } |
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194 } |
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195 |
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196 fn read_nodes( |
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197 on_disk: &[u8], |
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198 slice: ChildNodes, |
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199 ) -> Result<dirstate_map::ChildNodes, HgError> { |
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200 read_slice::<Node>(on_disk, slice)? |
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201 .iter() |
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202 .map(|node| { |
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203 Ok((node.path(on_disk)?, node.to_in_memory_node(on_disk)?)) |
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204 }) |
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205 .collect() |
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206 } |
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207 |
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208 fn read_hg_path(on_disk: &[u8], slice: Slice) -> Result<Cow<HgPath>, HgError> { |
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209 let bytes = read_slice::<u8>(on_disk, slice)?; |
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210 Ok(Cow::Borrowed(HgPath::new(bytes))) |
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211 } |
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212 |
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213 fn read_slice<T>(on_disk: &[u8], slice: Slice) -> Result<&[T], HgError> |
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214 where |
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215 T: BytesCast, |
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216 { |
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217 // Either `usize::MAX` would result in "out of bounds" error since a single |
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218 // `&[u8]` cannot occupy the entire addess space. |
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219 let start = usize::try_from(slice.start.get()).unwrap_or(std::usize::MAX); |
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220 let len = usize::try_from(slice.len.get()).unwrap_or(std::usize::MAX); |
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221 on_disk |
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222 .get(start..) |
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223 .and_then(|bytes| T::slice_from_bytes(bytes, len).ok()) |
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224 .map(|(slice, _rest)| slice) |
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225 .ok_or_else(|| { |
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226 HgError::corrupted("dirstate v2 slice is out of bounds") |
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227 }) |
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228 } |
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229 |
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230 pub(super) fn write( |
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231 dirstate_map: &mut DirstateMap, |
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232 parents: DirstateParents, |
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233 now: Timestamp, |
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234 ) -> Result<Vec<u8>, DirstateError> { |
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235 // TODO: how do we want to handle this in 2038? |
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236 let now: i32 = now.0.try_into().expect("time overflow"); |
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237 |
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238 let header_len = std::mem::size_of::<Header>(); |
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239 |
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240 // This ignores the space for paths, and for nodes without an entry. |
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241 // TODO: better estimate? Skip the `Vec` and write to a file directly? |
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242 let size_guess = header_len |
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243 + std::mem::size_of::<Node>() |
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244 * dirstate_map.nodes_with_entry_count as usize; |
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245 let mut out = Vec::with_capacity(size_guess); |
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246 |
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247 // Keep space for the header. We’ll fill it out at the end when we know the |
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248 // actual offset for the root nodes. |
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249 out.resize(header_len, 0_u8); |
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250 |
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251 let root = write_nodes(&mut dirstate_map.root, now, &mut out)?; |
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252 |
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253 let header = Header { |
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254 marker: *V2_FORMAT_MARKER, |
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255 parents: parents, |
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256 root, |
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257 nodes_with_entry_count: dirstate_map.nodes_with_entry_count.into(), |
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258 nodes_with_copy_source_count: dirstate_map |
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259 .nodes_with_copy_source_count |
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260 .into(), |
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261 }; |
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262 out[..header_len].copy_from_slice(header.as_bytes()); |
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263 Ok(out) |
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264 } |
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265 |
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266 /// Serialize the dirstate to the `v2` format after clearing ambigous `mtime`s. |
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267 fn write_nodes( |
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268 nodes: &mut dirstate_map::ChildNodes, |
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269 now: i32, |
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270 out: &mut Vec<u8>, |
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271 ) -> Result<ChildNodes, DirstateError> { |
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272 // `dirstate_map::ChildNodes` is a `HashMap` with undefined iteration |
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273 // order. Sort to enable binary search in the written file. |
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274 let nodes = dirstate_map::Node::sorted(nodes); |
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275 |
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276 // First accumulate serialized nodes in a `Vec` |
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277 let mut on_disk_nodes = Vec::with_capacity(nodes.len()); |
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278 for (full_path, node) in nodes { |
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279 on_disk_nodes.push(Node { |
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280 children: write_nodes(&mut node.children, now, out)?, |
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281 tracked_descendants_count: node.tracked_descendants_count.into(), |
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282 full_path: write_slice::<u8>( |
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283 full_path.full_path().as_bytes(), |
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284 out, |
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285 ), |
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286 base_name_start: u32::try_from(full_path.base_name_start()) |
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287 // Could only panic for paths over 4 GiB |
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288 .expect("dirstate-v2 offset overflow") |
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289 .into(), |
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290 copy_source: if let Some(source) = &node.copy_source { |
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291 write_slice::<u8>(source.as_bytes(), out) |
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292 } else { |
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293 Slice { |
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294 start: 0.into(), |
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295 len: 0.into(), |
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296 } |
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297 }, |
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298 entry: if let Some(entry) = &mut node.entry { |
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299 clear_ambiguous_mtime(entry, now); |
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300 OptEntry { |
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301 state: entry.state.into(), |
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302 mode: entry.mode.into(), |
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303 mtime: entry.mtime.into(), |
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304 size: entry.size.into(), |
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305 } |
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306 } else { |
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307 OptEntry { |
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308 state: b'\0', |
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309 mode: 0.into(), |
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310 mtime: 0.into(), |
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311 size: 0.into(), |
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312 } |
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313 }, |
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314 }) |
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315 } |
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316 // … so we can write them contiguously |
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317 Ok(write_slice::<Node>(&on_disk_nodes, out)) |
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318 } |
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319 |
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320 fn write_slice<T>(slice: &[T], out: &mut Vec<u8>) -> Slice |
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321 where |
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322 T: BytesCast, |
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323 { |
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324 let start = u64::try_from(out.len()) |
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325 // Could only panic on a 128-bit CPU with a dirstate over 16 EiB |
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326 .expect("dirstate-v2 offset overflow") |
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327 .into(); |
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328 let len = u32::try_from(slice.len()) |
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329 // Could only panic for paths over 4 GiB or nodes with over 4 billions |
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330 // child nodes |
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331 .expect("dirstate-v2 offset overflow") |
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332 .into(); |
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333 out.extend(slice.as_bytes()); |
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334 Slice { start, len } |
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335 } |