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
|
// mmap_win.cpp
/* Copyright 2009 10gen Inc.
*
* Licensed 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.
*/
#include "pch.h"
#include "mmap.h"
#include "text.h"
#include "../db/mongommf.h"
#include "../db/concurrency.h"
namespace mongo {
mutex mapViewMutex("mapView");
ourbitset writable;
MAdvise::MAdvise(void *,unsigned, Advice) { }
MAdvise::~MAdvise() { }
/** notification on unmapping so we can clear writable bits */
void MemoryMappedFile::clearWritableBits(void *p) {
for( unsigned i = ((size_t)p)/ChunkSize; i <= (((size_t)p)+len)/ChunkSize; i++ ) {
writable.clear(i);
assert( !writable.get(i) );
}
}
MemoryMappedFile::MemoryMappedFile()
: _flushMutex(new mutex("flushMutex")) {
fd = 0;
maphandle = 0;
len = 0;
created();
}
void MemoryMappedFile::close() {
mmmutex.assertExclusivelyLocked();
for( vector<void*>::iterator i = views.begin(); i != views.end(); i++ ) {
clearWritableBits(*i);
UnmapViewOfFile(*i);
}
views.clear();
if ( maphandle )
CloseHandle(maphandle);
maphandle = 0;
if ( fd )
CloseHandle(fd);
fd = 0;
destroyed(); // cleans up from the master list of mmaps
}
unsigned long long mapped = 0;
void* MemoryMappedFile::createReadOnlyMap() {
assert( maphandle );
scoped_lock lk(mapViewMutex);
void *p = MapViewOfFile(maphandle, FILE_MAP_READ, /*f ofs hi*/0, /*f ofs lo*/ 0, /*dwNumberOfBytesToMap 0 means to eof*/0);
if ( p == 0 ) {
DWORD e = GetLastError();
log() << "FILE_MAP_READ MapViewOfFile failed " << filename() << " " << errnoWithDescription(e) << endl;
}
else {
views.push_back(p);
}
return p;
}
void* MemoryMappedFile::map(const char *filenameIn, unsigned long long &length, int options) {
assert( fd == 0 && len == 0 ); // can't open more than once
setFilename(filenameIn);
/* big hack here: Babble uses db names with colons. doesn't seem to work on windows. temporary perhaps. */
char filename[256];
strncpy(filename, filenameIn, 255);
filename[255] = 0;
{
size_t len = strlen( filename );
for ( size_t i=len-1; i>=0; i-- ) {
if ( filename[i] == '/' ||
filename[i] == '\\' )
break;
if ( filename[i] == ':' )
filename[i] = '_';
}
}
updateLength( filename, length );
{
DWORD createOptions = FILE_ATTRIBUTE_NORMAL;
if ( options & SEQUENTIAL )
createOptions |= FILE_FLAG_SEQUENTIAL_SCAN;
DWORD rw = GENERIC_READ | GENERIC_WRITE;
fd = CreateFile(
toNativeString(filename).c_str(),
rw, // desired access
FILE_SHARE_WRITE | FILE_SHARE_READ, // share mode
NULL, // security
OPEN_ALWAYS, // create disposition
createOptions , // flags
NULL); // hTempl
if ( fd == INVALID_HANDLE_VALUE ) {
DWORD e = GetLastError();
log() << "Create/OpenFile failed " << filename << " errno:" << e << endl;
return 0;
}
}
mapped += length;
{
DWORD flProtect = PAGE_READWRITE; //(options & READONLY)?PAGE_READONLY:PAGE_READWRITE;
maphandle = CreateFileMapping(fd, NULL, flProtect,
length >> 32 /*maxsizehigh*/,
(unsigned) length /*maxsizelow*/,
NULL/*lpName*/);
if ( maphandle == NULL ) {
DWORD e = GetLastError(); // log() call was killing lasterror before we get to that point in the stream
log() << "CreateFileMapping failed " << filename << ' ' << errnoWithDescription(e) << endl;
close();
return 0;
}
}
void *view = 0;
{
scoped_lock lk(mapViewMutex);
DWORD access = (options&READONLY)? FILE_MAP_READ : FILE_MAP_ALL_ACCESS;
view = MapViewOfFile(maphandle, access, /*f ofs hi*/0, /*f ofs lo*/ 0, /*dwNumberOfBytesToMap 0 means to eof*/0);
}
if ( view == 0 ) {
DWORD e = GetLastError();
log() << "MapViewOfFile failed " << filename << " " << errnoWithDescription(e) <<
((sizeof(void*)==4)?" (32 bit build)":"") << endl;
close();
}
else {
views.push_back(view);
}
len = length;
return view;
}
class WindowsFlushable : public MemoryMappedFile::Flushable {
public:
WindowsFlushable( void * view , HANDLE fd , string filename , boost::shared_ptr<mutex> flushMutex )
: _view(view) , _fd(fd) , _filename(filename) , _flushMutex(flushMutex)
{}
void flush() {
if (!_view || !_fd)
return;
scoped_lock lk(*_flushMutex);
bool success = FlushViewOfFile(_view, 0); // 0 means whole mapping
if (!success) {
int err = GetLastError();
out() << "FlushViewOfFile failed " << err << " file: " << _filename << endl;
}
success = FlushFileBuffers(_fd);
if (!success) {
int err = GetLastError();
out() << "FlushFileBuffers failed " << err << " file: " << _filename << endl;
}
}
void * _view;
HANDLE _fd;
string _filename;
boost::shared_ptr<mutex> _flushMutex;
};
void MemoryMappedFile::flush(bool sync) {
uassert(13056, "Async flushing not supported on windows", sync);
if( !views.empty() ) {
WindowsFlushable f( viewForFlushing() , fd , filename() , _flushMutex);
f.flush();
}
}
MemoryMappedFile::Flushable * MemoryMappedFile::prepareFlush() {
return new WindowsFlushable( viewForFlushing() , fd , filename() , _flushMutex );
}
void MemoryMappedFile::_lock() {}
void MemoryMappedFile::_unlock() {}
}
|
