1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
use crate::{FileWrapper, ProcResult};
use std::io::{BufRead, BufReader};
#[cfg(feature = "serde1")]
use serde::{Deserialize, Serialize};
#[derive(Debug, Clone, PartialEq, Eq)]
#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
pub enum LockType {
FLock,
Posix,
ODF,
Other(String),
}
impl LockType {
pub fn as_str(&self) -> &str {
match self {
LockType::FLock => "FLOCK",
LockType::Posix => "POSIX",
LockType::ODF => "ODF",
LockType::Other(s) => s.as_ref(),
}
}
}
impl From<&str> for LockType {
fn from(s: &str) -> LockType {
match s {
"FLOCK" => LockType::FLock,
"OFDLCK" => LockType::ODF,
"POSIX" => LockType::Posix,
x => LockType::Other(x.to_string()),
}
}
}
#[derive(Debug, Clone)]
#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
pub enum LockMode {
Advisory,
Mandatory,
Other(String),
}
impl LockMode {
pub fn as_str(&self) -> &str {
match self {
LockMode::Advisory => "ADVISORY",
LockMode::Mandatory => "MANDATORY",
LockMode::Other(s) => s.as_ref(),
}
}
}
impl From<&str> for LockMode {
fn from(s: &str) -> LockMode {
match s {
"ADVISORY" => LockMode::Advisory,
"MANDATORY" => LockMode::Mandatory,
x => LockMode::Other(x.to_string()),
}
}
}
#[derive(Debug, Clone)]
#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
pub enum LockKind {
Read,
Write,
Other(String),
}
impl LockKind {
pub fn as_str(&self) -> &str {
match self {
LockKind::Read => "READ",
LockKind::Write => "WRITE",
LockKind::Other(s) => s.as_ref(),
}
}
}
impl From<&str> for LockKind {
fn from(s: &str) -> LockKind {
match s {
"READ" => LockKind::Read,
"WRITE" => LockKind::Write,
x => LockKind::Other(x.to_string()),
}
}
}
#[derive(Debug, Clone)]
#[cfg_attr(feature = "serde1", derive(Serialize, Deserialize))]
pub struct Lock {
pub lock_type: LockType,
pub mode: LockMode,
pub kind: LockKind,
pub pid: Option<i32>,
pub devmaj: u32,
pub devmin: u32,
pub inode: u64,
pub offset_first: u64,
pub offset_last: Option<u64>,
}
impl Lock {
fn from_line(line: &str) -> ProcResult<Lock> {
let mut s = line.split_whitespace();
let _ = expect!(s.next());
let typ = {
let t = expect!(s.next());
if t == "->" {
From::from(expect!(s.next()))
} else {
From::from(t)
}
};
let mode = From::from(expect!(s.next()));
let kind = From::from(expect!(s.next()));
let pid = expect!(s.next());
let disk_inode = expect!(s.next());
let offset_first = from_str!(u64, expect!(s.next()));
let offset_last = expect!(s.next());
let mut dis = disk_inode.split(':');
let devmaj = from_str!(u32, expect!(dis.next()), 16);
let devmin = from_str!(u32, expect!(dis.next()), 16);
let inode = from_str!(u64, expect!(dis.next()));
Ok(Lock {
lock_type: typ,
mode,
kind,
pid: if pid == "-1" { None } else { Some(from_str!(i32, pid)) },
devmaj,
devmin,
inode,
offset_first,
offset_last: if offset_last == "EOF" {
None
} else {
Some(from_str!(u64, offset_last))
},
})
}
}
pub fn locks() -> ProcResult<Vec<Lock>> {
let file = FileWrapper::open("/proc/locks")?;
let reader = BufReader::new(file);
let mut v = Vec::new();
for line in reader.lines() {
let line = line?;
v.push(Lock::from_line(&line)?);
}
Ok(v)
}
#[cfg(test)]
mod tests {
use crate::{locks, LockKind, LockMode, LockType};
#[test]
fn live() {
for lock in locks().unwrap() {
println!("{:?}", lock);
if let LockType::Other(s) = lock.lock_type {
panic!("Found an unknown lock type {:?}", s);
}
if let LockKind::Other(s) = lock.kind {
panic!("Found an unknown lock kind {:?}", s);
}
if let LockMode::Other(s) = lock.mode {
panic!("Found an unknown lock mode {:?}", s);
}
}
}
#[test]
fn test_blocked() {
let data = r#"1: POSIX ADVISORY WRITE 723 00:14:16845 0 EOF
2: FLOCK ADVISORY WRITE 652 00:14:16763 0 EOF
3: FLOCK ADVISORY WRITE 1594 fd:00:396528 0 EOF
4: FLOCK ADVISORY WRITE 1594 fd:00:396527 0 EOF
5: FLOCK ADVISORY WRITE 2851 fd:00:529372 0 EOF
6: POSIX ADVISORY WRITE 1280 00:14:16200 0 0
6: -> POSIX ADVISORY WRITE 1281 00:14:16200 0 0
6: -> POSIX ADVISORY WRITE 1279 00:14:16200 0 0
6: -> POSIX ADVISORY WRITE 1282 00:14:16200 0 0
6: -> POSIX ADVISORY WRITE 1283 00:14:16200 0 0
7: OFDLCK ADVISORY READ -1 00:06:1028 0 EOF
8: FLOCK ADVISORY WRITE 6471 fd:00:529426 0 EOF
9: FLOCK ADVISORY WRITE 6471 fd:00:529424 0 EOF
10: FLOCK ADVISORY WRITE 6471 fd:00:529420 0 EOF
11: FLOCK ADVISORY WRITE 6471 fd:00:529418 0 EOF
12: POSIX ADVISORY WRITE 1279 00:14:23553 0 EOF
13: FLOCK ADVISORY WRITE 6471 fd:00:393838 0 EOF
14: POSIX ADVISORY WRITE 655 00:14:16146 0 EOF"#;
for line in data.lines() {
super::Lock::from_line(line.trim()).unwrap();
}
}
}