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
|
// @file logfile.cpp simple file log writing / journaling
/**
* Copyright (C) 2008 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "pch.h"
#include "logfile.h"
#include "text.h"
#include "mongoutils/str.h"
#include "unittest.h"
using namespace mongoutils;
namespace mongo {
struct LogfileTest : public UnitTest {
LogfileTest() { }
void run() {
if( 0 && debug ) {
try {
LogFile f("logfile_test");
void *p = malloc(16384);
char *buf = (char*) p;
buf += 4095;
buf = (char*) (((size_t)buf)&(~0xfff));
memset(buf, 'z', 8192);
buf[8190] = '\n';
buf[8191] = 'B';
buf[0] = 'A';
f.synchronousAppend(buf, 8192);
f.synchronousAppend(buf, 8192);
free(p);
}
catch(DBException& e ) {
log() << "logfile.cpp test failed : " << e.what() << endl;
throw;
}
}
}
} __test;
}
#if defined(_WIN32)
namespace mongo {
LogFile::LogFile(string name) : _name(name) {
_fd = CreateFile(
toNativeString(name.c_str()).c_str(),
GENERIC_WRITE,
FILE_SHARE_READ,
NULL,
OPEN_ALWAYS,
FILE_FLAG_NO_BUFFERING | FILE_FLAG_WRITE_THROUGH,
NULL);
if( _fd == INVALID_HANDLE_VALUE ) {
DWORD e = GetLastError();
uasserted(13518, str::stream() << "couldn't open file " << name << " for writing " << errnoWithDescription(e));
}
SetFilePointer(_fd, 0, 0, FILE_BEGIN);
}
LogFile::~LogFile() {
if( _fd != INVALID_HANDLE_VALUE )
CloseHandle(_fd);
}
void LogFile::truncate() {
verify(15870, _fd != INVALID_HANDLE_VALUE);
if (!SetEndOfFile(_fd)){
msgasserted(15871, "Couldn't truncate file: " + errnoWithDescription());
}
}
void LogFile::synchronousAppend(const void *_buf, size_t _len) {
const size_t BlockSize = 8 * 1024 * 1024;
assert(_fd);
assert(_len % 4096 == 0);
const char *buf = (const char *) _buf;
size_t left = _len;
while( left ) {
size_t toWrite = min(left, BlockSize);
DWORD written;
if( !WriteFile(_fd, buf, toWrite, &written, NULL) ) {
DWORD e = GetLastError();
if( e == 87 )
msgasserted(13519, "error 87 appending to file - invalid parameter");
else
uasserted(13517, str::stream() << "error appending to file " << _name << ' ' << _len << ' ' << toWrite << ' ' << errnoWithDescription(e));
}
else {
dassert( written == toWrite );
}
left -= written;
buf += written;
}
}
}
#else
// posix
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include "paths.h"
namespace mongo {
LogFile::LogFile(string name) : _name(name) {
int options = O_CREAT
| O_WRONLY
#if defined(O_DIRECT)
| O_DIRECT
#endif
#if defined(O_NOATIME)
| O_NOATIME
#endif
;
_fd = open(name.c_str(), options, S_IRUSR | S_IWUSR);
#if defined(O_DIRECT)
_direct = true;
if( _fd < 0 ) {
_direct = false;
options &= ~O_DIRECT;
_fd = open(name.c_str(), options, S_IRUSR | S_IWUSR);
}
#else
_direct = false;
#endif
if( _fd < 0 ) {
uasserted(13516, str::stream() << "couldn't open file " << name << " for writing " << errnoWithDescription());
}
flushMyDirectory(name);
}
LogFile::~LogFile() {
if( _fd >= 0 )
close(_fd);
_fd = -1;
}
void LogFile::truncate() {
verify(15872, _fd >= 0);
BOOST_STATIC_ASSERT(sizeof(off_t) == 8); // we don't want overflow here
const off_t pos = lseek(_fd, 0, SEEK_CUR); // doesn't actually seek
if (ftruncate(_fd, pos) != 0){
msgasserted(15873, "Couldn't truncate file: " + errnoWithDescription());
}
}
void LogFile::synchronousAppend(const void *b, size_t len) {
const char *buf = static_cast<const char *>( b );
ssize_t charsToWrite = static_cast<ssize_t>( len );
if (charsToWrite < 0 || _fd < 0) {
log() << "LogFile::synchronousAppend preconditions not met.";
::abort();
}
#ifdef POSIX_FADV_DONTNEED
const off_t pos = lseek(_fd, 0, SEEK_CUR); // doesn't actually seek
#endif
while ( charsToWrite > 0 ) {
const ssize_t written = write( _fd, buf, static_cast<size_t>( charsToWrite ) );
if ( -1 == written ) {
log() << "LogFile::synchronousAppend failed with " << charsToWrite
<< " bytes unwritten out of " << len << " bytes; b=" << b << ' '
<< errnoWithDescription() << std::endl;
::abort();
}
buf += written;
charsToWrite -= written;
}
if(
#if defined(__linux__)
fdatasync(_fd) < 0
#else
fsync(_fd)
#endif
) {
log() << "error appending to file on fsync " << ' ' << errnoWithDescription();
::abort();
}
#ifdef POSIX_FADV_DONTNEED
if (!_direct)
posix_fadvise(_fd, pos, len, POSIX_FADV_DONTNEED);
#endif
}
}
#endif
|
