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/** 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 "mongo/util/file.h"
#include <boost/cstdint.hpp>
#include <boost/filesystem/operations.hpp>
#include <iostream>
#include <string>
#ifndef _WIN32
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/statvfs.h>
#include <sys/types.h>
#endif
#include "mongo/platform/basic.h"
#include "mongo/platform/cstdint.h"
#include "mongo/util/allocator.h"
#include "mongo/util/assert_util.h"
#include "mongo/util/log.h"
#include "mongo/util/mongoutils/str.h"
#include "mongo/util/text.h"
namespace mongo {
#if defined(_WIN32)
File::File()
: _bad(true), _handle(INVALID_HANDLE_VALUE) {}
File::~File() {
if (is_open()) {
CloseHandle(_handle);
}
_handle = INVALID_HANDLE_VALUE;
}
intmax_t File::freeSpace(const std::string& path) {
ULARGE_INTEGER avail;
if (GetDiskFreeSpaceExW(toWideString(path.c_str()).c_str(),
&avail, // bytes available to caller
NULL, // ptr to returned total size
NULL)) { // ptr to returned total free
return avail.QuadPart;
}
DWORD dosError = GetLastError();
log() << "In File::freeSpace(), GetDiskFreeSpaceEx for '" << path
<< "' failed with " << errnoWithDescription(dosError) << std::endl;
return -1;
}
void File::fsync() const {
if (FlushFileBuffers(_handle) == 0) {
DWORD dosError = GetLastError();
log() << "In File::fsync(), FlushFileBuffers for '" << _name
<< "' failed with " << errnoWithDescription(dosError) << std::endl;
}
}
bool File::is_open() const { return _handle != INVALID_HANDLE_VALUE; }
fileofs File::len() {
LARGE_INTEGER li;
if (GetFileSizeEx(_handle, &li)) {
return li.QuadPart;
}
_bad = true;
DWORD dosError = GetLastError();
log() << "In File::len(), GetFileSizeEx for '" << _name
<< "' failed with " << errnoWithDescription(dosError) << std::endl;
return 0;
}
void File::open(const char* filename, bool readOnly, bool direct) {
_name = filename;
_handle = CreateFileW(toNativeString(filename).c_str(), // filename
(readOnly ? 0 : GENERIC_WRITE) | GENERIC_READ, // desired access
FILE_SHARE_WRITE | FILE_SHARE_READ, // share mode
NULL, // security
OPEN_ALWAYS, // create or open
FILE_ATTRIBUTE_NORMAL, // file attributes
NULL); // template
_bad = !is_open();
if (_bad) {
DWORD dosError = GetLastError();
log() << "In File::open(), CreateFileW for '" << _name
<< "' failed with " << errnoWithDescription(dosError) << std::endl;
}
}
void File::read(fileofs o, char* data, unsigned len) {
LARGE_INTEGER li;
li.QuadPart = o;
if (SetFilePointerEx(_handle, li, NULL, FILE_BEGIN) == 0) {
_bad = true;
DWORD dosError = GetLastError();
log() << "In File::read(), SetFilePointerEx for '" << _name
<< "' tried to set the file pointer to " << o
<< " but failed with " << errnoWithDescription(dosError) << std::endl;
return;
}
DWORD bytesRead;
if (!ReadFile(_handle, data, len, &bytesRead, 0)) {
_bad = true;
DWORD dosError = GetLastError();
log() << "In File::read(), ReadFile for '" << _name
<< "' failed with " << errnoWithDescription(dosError) << std::endl;
}
else if (bytesRead != len) {
_bad = true;
msgasserted(10438,
mongoutils::str::stream() << "In File::read(), ReadFile for '" << _name
<< "' read " << bytesRead
<< " bytes while trying to read " << len
<< " bytes starting at offset " << o
<< ", truncated file?");
}
}
void File::truncate(fileofs size) {
if (len() <= size) {
return;
}
LARGE_INTEGER li;
li.QuadPart = size;
if (SetFilePointerEx(_handle, li, NULL, FILE_BEGIN) == 0) {
_bad = true;
DWORD dosError = GetLastError();
log() << "In File::truncate(), SetFilePointerEx for '" << _name
<< "' tried to set the file pointer to " << size
<< " but failed with " << errnoWithDescription(dosError) << std::endl;
return;
}
if (SetEndOfFile(_handle) == 0) {
_bad = true;
DWORD dosError = GetLastError();
log() << "In File::truncate(), SetEndOfFile for '" << _name
<< "' failed with " << errnoWithDescription(dosError) << std::endl;
}
}
void File::write(fileofs o, const char* data, unsigned len) {
LARGE_INTEGER li;
li.QuadPart = o;
if (SetFilePointerEx(_handle, li, NULL, FILE_BEGIN) == 0) {
_bad = true;
DWORD dosError = GetLastError();
log() << "In File::write(), SetFilePointerEx for '" << _name
<< "' tried to set the file pointer to " << o
<< " but failed with " << errnoWithDescription(dosError) << std::endl;
return;
}
DWORD bytesWritten;
if (WriteFile(_handle, data, len, &bytesWritten, NULL) == 0) {
_bad = true;
DWORD dosError = GetLastError();
log() << "In File::write(), WriteFile for '" << _name
<< "' tried to write " << len
<< " bytes but only wrote " << bytesWritten
<< " bytes, failing with " << errnoWithDescription(dosError) << std::endl;
}
}
#else // _WIN32
File::File()
: _bad(true), _fd(-1) {}
File::~File() {
if (is_open()) {
::close(_fd);
}
_fd = -1;
}
intmax_t File::freeSpace(const std::string& path) {
struct statvfs info;
if (statvfs(path.c_str(), &info) == 0) {
return static_cast<intmax_t>(info.f_bavail) * info.f_frsize;
}
log() << "In File::freeSpace(), statvfs for '" << path
<< "' failed with " << errnoWithDescription() << std::endl;
return -1;
}
void File::fsync() const {
if (::fsync(_fd)) {
log() << "In File::fsync(), ::fsync for '" << _name
<< "' failed with " << errnoWithDescription() << std::endl;
}
}
bool File::is_open() const { return _fd > 0; }
fileofs File::len() {
off_t o = lseek(_fd, 0, SEEK_END);
if (o != static_cast<off_t>(-1)) {
return o;
}
_bad = true;
log() << "In File::len(), lseek for '" << _name
<< "' failed with " << errnoWithDescription() << std::endl;
return 0;
}
#ifndef O_NOATIME
#define O_NOATIME 0
#endif
void File::open(const char* filename, bool readOnly, bool direct) {
_name = filename;
_fd = ::open(filename,
(readOnly ? O_RDONLY : (O_CREAT | O_RDWR | O_NOATIME))
#if defined(O_DIRECT)
| (direct ? O_DIRECT : 0)
#endif
,
S_IRUSR | S_IWUSR);
_bad = !is_open();
if (_bad) {
log() << "In File::open(), ::open for '" << _name
<< "' failed with " << errnoWithDescription() << std::endl;
}
}
void File::read(fileofs o, char *data, unsigned len) {
ssize_t bytesRead = ::pread(_fd, data, len, o);
if (bytesRead == -1) {
_bad = true;
log() << "In File::read(), ::pread for '" << _name
<< "' failed with " << errnoWithDescription() << std::endl;
}
else if (bytesRead != static_cast<ssize_t>(len)) {
_bad = true;
msgasserted(16569,
mongoutils::str::stream() << "In File::read(), ::pread for '" << _name
<< "' read " << bytesRead
<< " bytes while trying to read " << len
<< " bytes starting at offset " << o
<< ", truncated file?");
}
}
void File::truncate(fileofs size) {
if (len() <= size) {
return;
}
if (ftruncate(_fd, size) != 0) {
_bad = true;
log() << "In File::truncate(), ftruncate for '" << _name
<< "' tried to set the file pointer to " << size
<< " but failed with " << errnoWithDescription() << std::endl;
return;
}
}
void File::write(fileofs o, const char *data, unsigned len) {
ssize_t bytesWritten = ::pwrite(_fd, data, len, o);
if (bytesWritten != static_cast<ssize_t>(len)) {
_bad = true;
log() << "In File::write(), ::pwrite for '" << _name
<< "' tried to write " << len
<< " bytes but only wrote " << bytesWritten
<< " bytes, failing with " << errnoWithDescription() << std::endl;
}
}
#endif // _WIN32
}
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