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Commit | Line | Data |
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606ce64b DM |
1 | use failure::*; |
2 | ||
3 | use super::chunk_store::*; | |
4 | ||
4818c8b6 | 5 | use std::io::{Read, Write}; |
606ce64b DM |
6 | use std::path::{Path, PathBuf}; |
7 | use std::os::unix::io::AsRawFd; | |
d13e3745 | 8 | use uuid::Uuid; |
4818c8b6 | 9 | use chrono::{Local, TimeZone}; |
606ce64b | 10 | |
d13e3745 DM |
11 | #[repr(C)] |
12 | pub struct ImageIndexHeader { | |
13 | pub magic: [u8; 12], | |
14 | pub version: u32, | |
15 | pub uuid: [u8; 16], | |
5e5b7f1c | 16 | pub ctime: u64, |
d13e3745 | 17 | pub size: u64, |
4818c8b6 DM |
18 | pub chunk_size: u64, |
19 | reserved: [u8; 4040], // oversall size is one page (4096 bytes) | |
d13e3745 | 20 | } |
606ce64b DM |
21 | |
22 | // split image into fixed size chunks | |
23 | ||
4818c8b6 DM |
24 | pub struct ImageIndexReader<'a> { |
25 | store: &'a mut ChunkStore, | |
26 | filename: PathBuf, | |
27 | chunk_size: usize, | |
28 | size: usize, | |
29 | index: *mut u8, | |
30 | uuid: [u8; 16], | |
31 | ctime: u64, | |
32 | } | |
33 | ||
34 | impl <'a> Drop for ImageIndexReader<'a> { | |
35 | ||
36 | fn drop(&mut self) { | |
37 | if let Err(err) = self.unmap() { | |
38 | eprintln!("Unable to unmap file {:?} - {}", self.filename, err); | |
39 | } | |
40 | } | |
41 | } | |
42 | ||
43 | impl <'a> ImageIndexReader<'a> { | |
44 | ||
45 | pub fn open(store: &'a mut ChunkStore, path: &Path) -> Result<Self, Error> { | |
46 | ||
47 | let full_path = store.relative_path(path); | |
48 | ||
49 | let mut file = std::fs::File::open(&full_path)?; | |
50 | ||
51 | let header_size = std::mem::size_of::<ImageIndexHeader>(); | |
52 | ||
53 | // todo: use static assertion when available in rust | |
54 | if header_size != 4096 { panic!("got unexpected header size"); } | |
55 | ||
56 | let mut buffer = vec![0u8; header_size]; | |
57 | file.read_exact(&mut buffer)?; | |
58 | ||
59 | let header = unsafe { &mut * (buffer.as_ptr() as *mut ImageIndexHeader) }; | |
60 | ||
61 | let size = u64::from_be(header.size) as usize; | |
62 | let ctime = u64::from_be(header.ctime); | |
63 | let chunk_size = u64::from_be(header.chunk_size) as usize; | |
64 | ||
65 | let index_size = ((size + chunk_size - 1)/chunk_size)*32; | |
66 | ||
67 | // fixme: verify file size ? | |
68 | ||
69 | let data = unsafe { nix::sys::mman::mmap( | |
70 | std::ptr::null_mut(), | |
71 | index_size, | |
72 | nix::sys::mman::ProtFlags::PROT_READ, | |
73 | nix::sys::mman::MapFlags::MAP_PRIVATE, | |
74 | file.as_raw_fd(), | |
75 | header_size as i64) }? as *mut u8; | |
76 | ||
77 | Ok(Self { | |
78 | store, | |
79 | filename: full_path, | |
80 | chunk_size, | |
81 | size, | |
82 | index: data, | |
83 | ctime, | |
84 | uuid: header.uuid, | |
85 | }) | |
86 | } | |
87 | ||
88 | fn unmap(&mut self) -> Result<(), Error> { | |
89 | ||
90 | if self.index == std::ptr::null_mut() { return Ok(()); } | |
91 | ||
92 | let index_size = ((self.size + self.chunk_size - 1)/self.chunk_size)*32; | |
93 | ||
94 | if let Err(err) = unsafe { nix::sys::mman::munmap(self.index as *mut std::ffi::c_void, index_size) } { | |
95 | bail!("unmap file {:?} failed - {}", self.filename, err); | |
96 | } | |
97 | ||
98 | self.index = std::ptr::null_mut(); | |
99 | ||
100 | Ok(()) | |
101 | } | |
102 | ||
103 | pub fn print_info(&self) { | |
104 | println!("Filename: {:?}", self.filename); | |
105 | println!("Size: {}", self.size); | |
106 | println!("ChunkSize: {}", self.chunk_size); | |
107 | println!("CTime: {}", Local.timestamp(self.ctime as i64, 0).format("%c")); | |
108 | println!("UUID: {:?}", self.uuid); | |
109 | } | |
110 | } | |
111 | ||
798881a6 | 112 | pub struct ImageIndexWriter<'a> { |
606ce64b | 113 | store: &'a mut ChunkStore, |
4fbb72a8 DM |
114 | filename: PathBuf, |
115 | tmp_filename: PathBuf, | |
606ce64b DM |
116 | chunk_size: usize, |
117 | size: usize, | |
118 | index: *mut u8, | |
d13e3745 | 119 | uuid: [u8; 16], |
5e5b7f1c | 120 | ctime: u64, |
606ce64b DM |
121 | } |
122 | ||
4fbb72a8 DM |
123 | impl <'a> Drop for ImageIndexWriter<'a> { |
124 | ||
125 | fn drop(&mut self) { | |
126 | let _ = std::fs::remove_file(&self.tmp_filename); // ignore errors | |
127 | if let Err(err) = self.unmap() { | |
0cd9d420 | 128 | eprintln!("Unable to unmap file {:?} - {}", self.tmp_filename, err); |
4fbb72a8 DM |
129 | } |
130 | } | |
131 | } | |
132 | ||
798881a6 | 133 | impl <'a> ImageIndexWriter<'a> { |
606ce64b DM |
134 | |
135 | pub fn create(store: &'a mut ChunkStore, path: &Path, size: usize) -> Result<Self, Error> { | |
136 | ||
137 | let full_path = store.relative_path(path); | |
4fbb72a8 DM |
138 | let mut tmp_path = full_path.clone(); |
139 | tmp_path.set_extension("tmp_iidx"); | |
606ce64b DM |
140 | |
141 | let mut file = std::fs::OpenOptions::new() | |
d13e3745 | 142 | .create(true).truncate(true) |
606ce64b DM |
143 | .read(true) |
144 | .write(true) | |
4fbb72a8 | 145 | .open(&tmp_path)?; |
606ce64b | 146 | |
4818c8b6 | 147 | let chunk_size = 64*1024; // fixed size for now?? |
d13e3745 DM |
148 | |
149 | let header_size = std::mem::size_of::<ImageIndexHeader>(); | |
150 | ||
151 | // todo: use static assertion when available in rust | |
152 | if header_size != 4096 { panic!("got unexpected header size"); } | |
153 | ||
154 | let ctime = std::time::SystemTime::now().duration_since( | |
5e5b7f1c | 155 | std::time::SystemTime::UNIX_EPOCH)?.as_secs(); |
d13e3745 DM |
156 | |
157 | let uuid = Uuid::new_v4(); | |
158 | ||
0cd9d420 | 159 | let buffer = vec![0u8; header_size]; |
d13e3745 DM |
160 | let header = unsafe { &mut * (buffer.as_ptr() as *mut ImageIndexHeader) }; |
161 | ||
5e5b7f1c | 162 | header.magic = *b"PROXMOX-IIDX"; |
d13e3745 | 163 | header.version = u32::to_be(1); |
5e5b7f1c | 164 | header.ctime = u64::to_be(ctime); |
d13e3745 | 165 | header.size = u64::to_be(size as u64); |
4818c8b6 | 166 | header.chunk_size = u64::to_be(chunk_size as u64); |
d13e3745 DM |
167 | header.uuid = *uuid.as_bytes(); |
168 | ||
5e5b7f1c | 169 | file.write_all(&buffer)?; |
d13e3745 | 170 | |
606ce64b | 171 | let index_size = ((size + chunk_size - 1)/chunk_size)*32; |
d13e3745 DM |
172 | nix::unistd::ftruncate(file.as_raw_fd(), (header_size + index_size) as i64)?; |
173 | ||
606ce64b DM |
174 | let data = unsafe { nix::sys::mman::mmap( |
175 | std::ptr::null_mut(), | |
176 | index_size, | |
177 | nix::sys::mman::ProtFlags::PROT_READ | nix::sys::mman::ProtFlags::PROT_WRITE, | |
178 | nix::sys::mman::MapFlags::MAP_SHARED, | |
179 | file.as_raw_fd(), | |
d13e3745 DM |
180 | header_size as i64) }? as *mut u8; |
181 | ||
606ce64b DM |
182 | |
183 | Ok(Self { | |
184 | store, | |
4fbb72a8 DM |
185 | filename: full_path, |
186 | tmp_filename: tmp_path, | |
606ce64b DM |
187 | chunk_size, |
188 | size, | |
189 | index: data, | |
d13e3745 DM |
190 | ctime, |
191 | uuid: *uuid.as_bytes(), | |
606ce64b DM |
192 | }) |
193 | } | |
194 | ||
4fbb72a8 DM |
195 | fn unmap(&mut self) -> Result<(), Error> { |
196 | ||
197 | if self.index == std::ptr::null_mut() { return Ok(()); } | |
198 | ||
199 | let index_size = ((self.size + self.chunk_size - 1)/self.chunk_size)*32; | |
200 | ||
201 | if let Err(err) = unsafe { nix::sys::mman::munmap(self.index as *mut std::ffi::c_void, index_size) } { | |
0cd9d420 | 202 | bail!("unmap file {:?} failed - {}", self.tmp_filename, err); |
4fbb72a8 DM |
203 | } |
204 | ||
205 | self.index = std::ptr::null_mut(); | |
206 | ||
207 | Ok(()) | |
208 | } | |
209 | ||
210 | pub fn close(&mut self) -> Result<(), Error> { | |
211 | ||
212 | if self.index == std::ptr::null_mut() { bail!("cannot close already closed index file."); } | |
213 | ||
214 | self.unmap()?; | |
215 | ||
216 | if let Err(err) = std::fs::rename(&self.tmp_filename, &self.filename) { | |
217 | bail!("Atomic rename file {:?} failed - {}", self.filename, err); | |
218 | } | |
219 | ||
220 | Ok(()) | |
221 | } | |
222 | ||
606ce64b DM |
223 | // Note: We want to add data out of order, so do not assume and order here. |
224 | pub fn add_chunk(&mut self, pos: usize, chunk: &[u8]) -> Result<(), Error> { | |
225 | ||
4fbb72a8 DM |
226 | if self.index == std::ptr::null_mut() { bail!("cannot write to closed index file."); } |
227 | ||
606ce64b DM |
228 | let end = pos + chunk.len(); |
229 | ||
230 | if end > self.size { | |
231 | bail!("write chunk data exceeds size ({} >= {})", end, self.size); | |
232 | } | |
233 | ||
234 | // last chunk can be smaller | |
235 | if ((end != self.size) && (chunk.len() != self.chunk_size)) || | |
236 | (chunk.len() > self.chunk_size) || (chunk.len() == 0) { | |
237 | bail!("got chunk with wrong length ({} != {}", chunk.len(), self.chunk_size); | |
238 | } | |
239 | ||
240 | if pos >= self.size { bail!("add chunk after end ({} >= {})", pos, self.size); } | |
241 | ||
242 | if pos & (self.chunk_size-1) != 0 { bail!("add unaligned chunk (pos = {})", pos); } | |
243 | ||
244 | ||
245 | let (is_duplicate, digest) = self.store.insert_chunk(chunk)?; | |
246 | ||
247 | println!("ADD CHUNK {} {} {} {}", pos, chunk.len(), is_duplicate, u256_to_hex(&digest)); | |
248 | ||
249 | let index_pos = (pos/self.chunk_size)*32; | |
250 | unsafe { | |
251 | let dst = self.index.add(index_pos); | |
252 | dst.copy_from_nonoverlapping(digest.as_ptr(), 32); | |
253 | } | |
254 | ||
255 | Ok(()) | |
256 | } | |
257 | } |