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file.cxx
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file.cxx
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//-< FILE.CXX >------------------------------------------------------*--------*
// POST++ Version 1.0 (c) 1998 GARRET * ? *
// (Persistent Object Storage) * /\| *
// * / \ *
// Created: 2-Feb-98 K.A. Knizhnik * / [] \ *
// Last update: 21-Jan-99 K.A. Knizhnik * GARRET *
// * / \ *
// Port to AIX done by XaoYao 13-Apr-97 * *
// Also thanks to Wolfgang Hendriks and Antonio Corrao for reporting
// bugs in this module.
//-------------------------------------------------------------------*--------*
// Mapped on memory file class implementation
//-------------------------------------------------------------------*--------*
#define INSIDE_POST
#include <time.h>
#include "storage.h"
BEGIN_POST_NAMESPACE
post_file* post_file::chain;
char* program_compilation_time;
void post_file::set_file_name(const char* file_name)
{
size_t len = strlen(file_name);
name = new char[len+5];
log_name = new char[len+5];
sav_name = new char[len+5];
tmp_name = new char[len+5];
strcpy(name, file_name);
if (len < 4 || file_name[len-4] != '.') {
strcat(name, ".odb");
}
strcat(strcpy(log_name, file_name), ".log");
strcat(strcpy(tmp_name, file_name), ".tmp");
strcat(strcpy(sav_name, file_name), ".sav");
}
#ifdef _WIN32
#ifndef _WIN64
bool post_file::handle_page_access(DWORD* params)
#else
bool post_file::handle_page_access(ULONG_PTR* params)
#endif
{
for (post_file* fp = chain; fp != NULL; fp = fp->next) {
if (params[1] - (ptrdiff_t)fp->base < fp->mapped_size) {
return fp->prot != read_only
&& fp->create_shadow_page(params[0], (void*)params[1]);
}
}
return false;
}
static LONG WINAPI AccessViolationHandler(LPEXCEPTION_POINTERS ep)
{
return ep->ExceptionRecord->ExceptionCode == EXCEPTION_ACCESS_VIOLATION
&& post_file::handle_page_access(ep->ExceptionRecord->ExceptionInformation)
? EXCEPTION_CONTINUE_EXECUTION
: EXCEPTION_CONTINUE_SEARCH;
}
post_file::post_file(const char* name, size_t max_file_size, void* default_base_address, size_t max_locked_pages)
{
SYSTEM_INFO sysinfo;
MEMORYSTATUS memstat;
OSVERSIONINFO osinfo;
osinfo.dwOSVersionInfoSize = sizeof osinfo;
GetVersionEx(&osinfo);
platform = osinfo.dwPlatformId;
GetSystemInfo(&sysinfo);
allocation_granularity = sysinfo.dwAllocationGranularity;
page_size = sysinfo.dwPageSize;
base = (char*)default_base_address;
if (platform == VER_PLATFORM_WIN32_NT) {
SIZE_T MinimumWorkingSetSize, MaximumWorkingSetSize;
GetProcessWorkingSetSize(GetCurrentProcess(),
&MinimumWorkingSetSize,
&MaximumWorkingSetSize);
if (max_locked_pages > MinimumWorkingSetSize/page_size) {
MinimumWorkingSetSize = max_locked_pages*2*page_size;
if (MaximumWorkingSetSize < MinimumWorkingSetSize) {
MaximumWorkingSetSize = MinimumWorkingSetSize;
}
if (!SetProcessWorkingSetSize(GetCurrentProcess(),
MinimumWorkingSetSize,
MaximumWorkingSetSize))
{
const size_t max_nt_locked_pages = 30;
TRACE_MSG(("post_file::file: failed to extend process working set "
"size to %ld bytes, set max_locked_pages to %ld\n",
MinimumWorkingSetSize, max_nt_locked_pages));
max_locked_pages = max_nt_locked_pages;
} else {
TRACE_MSG(("post_file::file: extend process working set size "
"to %ld bytes\n", MinimumWorkingSetSize));
}
}
} else {
max_locked_pages = 0;
}
memstat.dwLength = sizeof(memstat);
GlobalMemoryStatus(&memstat);
if (memstat.dwAvailVirtual < max_file_size) {
max_file_size = memstat.dwAvailVirtual & ~(allocation_granularity-1);
TRACE_MSG(("post_file::file: set max_file_size to %ld bytes\n",
max_file_size));
}
set_file_name(name);
this->max_file_size = ALIGN(max_file_size, allocation_granularity);
this->max_locked_pages = max_locked_pages;
log_buffer = new char[page_size+sizeof(ptrdiff_t)];
locked_page = new char*[max_locked_pages];
SetUnhandledExceptionFilter(AccessViolationHandler);
error_code = ok;
}
post_file::~post_file()
{
delete[] name;
delete[] log_name;
delete[] tmp_name;
delete[] sav_name;
delete[] log_buffer;
delete[] locked_page;
}
inline bool post_file::recover_file()
{
DWORD read_bytes;
size_t trans_size = page_size + sizeof(ptrdiff_t);
int n_recovered_pages = 0;
TRACE_MSG(("post_file::recover_file: recover data file from transaction log\n"));
recovery = true;
while (ReadFile(log, log_buffer, trans_size, &read_bytes, NULL)) {
if (read_bytes != trans_size) {
recovery = false;
if (read_bytes == 0) {
size = ALIGN(((file_header*)base)->file_size, page_size);
TRACE_MSG(("recover::file: recover %d pages, set file size "
"to %ld\n", n_recovered_pages, size));
error_code = ok;
return true;
} else {
error_code = end_of_file;
TRACE_MSG(("post_file::recover_file: read %ld bytes from log "
"instead of %ld\n",
read_bytes, trans_size));
return false;
}
}
size_t offs = *(ptrdiff_t*)log_buffer;
assert(offs < size);
memcpy(base + offs, log_buffer+sizeof(ptrdiff_t), page_size);
n_recovered_pages += 1;
}
error_code = GetLastError();
TRACE_MSG(("post_file::recover_file: failed to read log file: %d\n",
error_code));
recovery = false;
return false;
}
inline bool post_file::flush_log_buffer()
{
if (!FlushFileBuffers(log)) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush_log_buffer: FlushFileBuffers failed: %d\n",
error_code));
return false;
}
for (size_t i = n_locked_pages; i-- > 0;) {
if (!VirtualUnlock(locked_page[i], page_size)) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush_log_buffer: VirtualUnlock %p failed: %d\n",
locked_page[i], error_code));
return false;
}
}
n_locked_pages = 0;
return true;
}
bool post_file::create_shadow_page(int modify, void* addr)
{
DWORD old_prot;
DWORD written_bytes;
char* page = (char*)(ptrdiff_t(addr) & ~(page_size-1));
size_t offs = page - base;
if (!VirtualProtect(page, page_size,
modify ? PAGE_READWRITE : PAGE_READONLY, &old_prot))
{
TRACE_MSG(("post_file::create_shadow_page: VirtualProtect %p failed: %ld\n",
page, GetLastError()));
return false;
}
if (platform != VER_PLATFORM_WIN32_NT) {
if (modify) {
size_t page_no = offs / page_size;
dirty_page_map[page_no >> 5] |= 1 << (page_no & 0x1F);
if (recovery) {
return true;
}
}
if (old_prot == PAGE_NOACCESS) {
if (!modify) {
if (!VirtualProtect(page,page_size,PAGE_READWRITE,&old_prot)){
TRACE_MSG(("post_file::create_shadow_page: "
"VirtualProtect2 %p failed: %ld\n",
page, GetLastError()));
return false;
}
}
DWORD read_bytes;
if (SetFilePointer(fd, offs, NULL, FILE_BEGIN) != offs
|| !ReadFile(fd, page, page_size, &read_bytes, NULL))
{
return false;
}
if (!modify) {
if (!VirtualProtect(page,page_size,PAGE_READONLY,&old_prot)) {
TRACE_MSG(("post_file::create_shadow_page: "
"VirtualProtect3 %p failed: %ld\n",
page, GetLastError()));
}
return true;
}
}
}
*(ptrdiff_t*)log_buffer = offs;
memcpy(log_buffer+sizeof(ptrdiff_t), page, page_size);
size_t trans_size = page_size + sizeof(ptrdiff_t);
if (!WriteFile(log, log_buffer, trans_size, &written_bytes, NULL)
|| written_bytes != trans_size)
{
TRACE_MSG(("post_file::create_shadow_page: WriteFile failed: %d\n",
GetLastError()));
return false;
}
if (max_locked_pages != 0) {
if (n_locked_pages >= max_locked_pages) {
return flush_log_buffer();
}
if (!VirtualLock(page, page_size)) {
TRACE_MSG(("post_file::create_shadow_page: VirtualLock %p failed,"
"number of locked pages %ld: %ld\n",
page, n_locked_pages, GetLastError()));
if (n_locked_pages != 0) {
max_locked_pages = n_locked_pages;
}
return flush_log_buffer();
}
locked_page[n_locked_pages++] = page;
}
return true;
}
bool post_file::read_file_in_memory()
{
#if DEBUG_LEVEL >= DEBUG_TRACE
msg_buf buf;
#endif
DWORD read_bytes;
vmem = (char*)VirtualAlloc(base, mapped_size,
MEM_RESERVE, PAGE_READWRITE);
if (vmem == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::read_file_in_memory: failed to virtual alloc at "
"address %p: %s\n", base, get_error_text(buf, sizeof buf)));
vmem = (char*)VirtualAlloc(NULL, mapped_size,
MEM_RESERVE, PAGE_READWRITE);
}
if (vmem == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::read_file_in_memory: failed to virtual alloc: %s\n",
get_error_text(buf, sizeof buf)));
CloseHandle(fd);
return false;
}
base = vmem;
if (size != 0) {
TRACE_MSG(("post_file::read_file_in_memory: virtual alloc: address=%p, "
"mapped_size=%ld, size=%ld\n", vmem, mapped_size, size));
if (base != (char*)VirtualAlloc(base, size, MEM_COMMIT,
PAGE_READWRITE)
|| SetFilePointer(fd, 0, NULL, FILE_BEGIN) != 0
|| ReadFile(fd, base, size, &read_bytes, NULL) == false)
{
error_code = GetLastError();
TRACE_MSG(("post_file::read_file_in_memory: failed to read file in "
"memory: %s\n", get_error_text(buf, sizeof buf)));
CloseHandle(fd);
VirtualFree(vmem, 0, MEM_RELEASE);
return false;
} else if (read_bytes != size) {
error_code = file_size_not_aligned;
TRACE_MSG(("post_file::read_file_in_memory:read %ld bytes instead "
"of %ld\n", read_bytes, size));
CloseHandle(fd);
VirtualFree(vmem, 0, MEM_RELEASE);
return false;
}
}
return true;
}
bool post_file::write_dirty_pages_in_file()
{
size_t offs = 0;
unsigned page_no;
for (page_no = 0; offs < size; page_no += 1) {
int mask = 1 << (page_no & 0x1F);
if (dirty_page_map[page_no >> 5] & mask) {
dirty_page_map[page_no >> 5] &= ~mask;
DWORD written_bytes;
if (SetFilePointer(fd, offs, NULL, FILE_BEGIN) != offs
|| !WriteFile(fd, base+offs, page_size, &written_bytes, 0)
|| written_bytes != page_size)
{
error_code = GetLastError();
TRACE_MSG(("post_file::write_dirty_pages_in_file: failed to write"
" page in file: %d\n", error_code));
return false;
}
DWORD old_prot;
if (!VirtualProtect(base+offs, page_size, PAGE_READONLY, &old_prot)) {
error_code = GetLastError();
TRACE_MSG(("post_file::write_dirty_pages_in_file: failed to change protection"
" to read-only: %d\n", error_code));
return false;
}
}
offs += page_size;
}
if (!FlushFileBuffers(fd)) {
error_code = GetLastError();
TRACE_MSG(("post_file::write_dirty_pages_in_file: FlushFileBuffers "
"failed: %d\n", error_code));
return false;
}
return true;
}
bool post_file::open(open_mode mode, access_prot prot)
{
#if DEBUG_LEVEL >= DEBUG_TRACE
msg_buf buf;
#endif
DWORD old_prot;
assert(name != NULL);
if (prot == read_only) {
mode = map_file;
} else if (mode == copy_on_write_map && platform != VER_PLATFORM_WIN32_NT){
mode = load_in_memory; // copy on write not working in Windows 95
}
this->mode = mode;
this->prot = prot;
vmem = NULL;
md = NULL;
recovery = false;
if (mode == shadow_pages_transaction) {
int flags = (platform == VER_PLATFORM_WIN32_NT)
? FILE_FLAG_WRITE_THROUGH|FILE_FLAG_RANDOM_ACCESS
: FILE_FLAG_RANDOM_ACCESS;
fd = CreateFileA(name, GENERIC_READ|GENERIC_WRITE, 0,
NULL, OPEN_ALWAYS, flags, NULL);
if (fd == INVALID_HANDLE_VALUE) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to open file '%s': %s\n",
name, get_error_text(buf, sizeof buf)));
return false;
}
DWORD read_bytes;
file_header hdr;
hdr.base_address = base;
hdr.file_size = 0;
if (!ReadFile(fd, &hdr, sizeof hdr, &read_bytes, NULL)
|| (read_bytes != 0 && read_bytes != sizeof hdr))
{
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to read file: %s\n",
get_error_text(buf, sizeof buf)));
CloseHandle(fd);
return false;
}
base = (char*)hdr.base_address;
allocated_size = size = ALIGN(hdr.file_size, page_size);
mapped_size = size > max_file_size ? size : max_file_size;
if (platform == VER_PLATFORM_WIN32_NT) {
md = CreateFileMapping(fd,NULL,PAGE_READWRITE,0,mapped_size,NULL);
if (md == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to create file mapping: "
"base=%p, size=%ld: %s\n",
base, mapped_size,
get_error_text(buf, sizeof buf)));
CloseHandle(fd);
return false;
}
void* p = MapViewOfFileEx(md, FILE_MAP_ALL_ACCESS, 0, 0, 0, base);
if (p == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to map view of file on address "
"%p: %s\n", base, get_error_text(buf, sizeof buf)));
p = MapViewOfFileEx(md, FILE_MAP_ALL_ACCESS, 0, 0, 0, NULL);
if (p == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to map view of file: %s\n",
get_error_text(buf, sizeof buf)));
CloseHandle(fd);
CloseHandle(md);
return false;
}
}
base = (char*)p;
dirty_page_map = NULL;
} else {
//
// VirtualProtect doesn't work in Winfows 95 with
// mapped on file memory. We have to use VirtualAlloc instead
// to handle page faults and read pages from the file ourself.
//
vmem = (char*)VirtualAlloc(base, mapped_size,
MEM_RESERVE, PAGE_READWRITE);
if (vmem == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to virtual alloc at address"
" %p: %s\n", base, get_error_text(buf,sizeof buf)));
vmem = (char*)VirtualAlloc(NULL, mapped_size,
MEM_RESERVE, PAGE_READWRITE);
}
if (vmem == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to virtual alloc: %s\n",
get_error_text(buf, sizeof buf)));
CloseHandle(fd);
return false;
}
base = vmem;
if (size != 0) {
TRACE_MSG(("post_file::open: virtual alloc: address=%p, "
"mapped_size=%ld, size=%ld\n",
vmem, mapped_size, size));
if (base != (char*)VirtualAlloc(base, size, MEM_COMMIT,
PAGE_NOACCESS))
{
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to read file in memory: "
"%s\n", get_error_text(buf, sizeof buf)));
CloseHandle(fd);
VirtualFree(vmem, 0, MEM_RELEASE);
return false;
}
}
size_t page_map_size = ((mapped_size / page_size) + 31) >> 5;
dirty_page_map = new int[page_map_size];
memset(dirty_page_map, 0, sizeof(int)*page_map_size);
}
n_locked_pages = 0;
if (max_locked_pages != 0) {
// check if we can use VirtualLock()
if (VirtualLock(base, page_size)) {
VirtualUnlock(base, page_size);
} else {
error_code = GetLastError();
TRACE_MSG(("post_file::open: VirtualLock test failed: %s\n",
get_error_text(buf, sizeof buf)));
max_locked_pages = 0;
}
}
int log_flags = FILE_FLAG_SEQUENTIAL_SCAN;
if (max_locked_pages == 0 && platform == VER_PLATFORM_WIN32_NT) {
log_flags |= FILE_FLAG_WRITE_THROUGH;
}
log = CreateFileA(log_name, GENERIC_READ|GENERIC_WRITE, 0, NULL,
OPEN_EXISTING, log_flags, NULL);
if (log == INVALID_HANDLE_VALUE) {
if (GetLastError() == ERROR_FILE_NOT_FOUND) {
log = CreateFileA(log_name, GENERIC_READ|GENERIC_WRITE, 0, NULL,
CREATE_ALWAYS, log_flags, NULL);
}
if (log == INVALID_HANDLE_VALUE) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to create log file '%': %s\n",
log_name, get_error_text(buf, sizeof buf)));
return_error:
if (md != NULL) {
UnmapViewOfFile(base);
CloseHandle(md);
} else {
VirtualFree(base, 0, MEM_RELEASE);
}
CloseHandle(fd);
CloseHandle(log);
delete[] dirty_page_map;
return false;
}
if (size != 0
&& platform == VER_PLATFORM_WIN32_NT
&& !VirtualProtect(base, size, PAGE_READONLY, &old_prot))
{
error_code = GetLastError();
TRACE_MSG(("post_file::open: VirtualProtect failed for base=%p, "
"size=%ld: %s\n",
base, size, get_error_text(buf, sizeof buf)));
goto return_error;
}
next = chain;
chain = this;
} else {
next = chain;
chain = this;
recover_file();
if (!commit()) {
chain = next;
goto return_error;
}
}
} else { // non-shadow_pages_transaction mode
int access_flags = (mode == map_file)
? GENERIC_READ|GENERIC_WRITE : GENERIC_READ;
int create_flags = (mode == map_file)
? OPEN_ALWAYS : OPEN_EXISTING;
int hint_flags = (mode == load_in_memory)
? FILE_FLAG_SEQUENTIAL_SCAN : FILE_FLAG_RANDOM_ACCESS;
int share_mode = (prot == read_only) ? FILE_SHARE_READ|FILE_SHARE_WRITE : FILE_SHARE_READ;
fd = CreateFileA(name, access_flags, share_mode, NULL,
create_flags, hint_flags, NULL);
size = 0;
if (fd != INVALID_HANDLE_VALUE) {
DWORD read_bytes;
if (!ReadFile(fd, &base, sizeof base, &read_bytes, NULL)
|| (read_bytes != 0 && read_bytes != sizeof base))
{
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to read file '%s': %s\n",
name, get_error_text(buf, sizeof buf)));
CloseHandle(fd);
return false;
}
size = GetFileSize(fd, NULL);
if ((size & (allocation_granularity-1)) != 0
&& prot != read_only
&& mode == copy_on_write_map
&& size < max_file_size)
{
error_code = file_size_not_aligned;
TRACE_MSG(("post_file::open: size of file '%s' is not aligned "
"on %ld\n", name, allocation_granularity));
return false;
}
if (mode == copy_on_write_map) {
mapped_size = size;
md = CreateFileMapping(fd, NULL, PAGE_WRITECOPY, 0, size,NULL);
if (md == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to create file mapping: "
"%s\n", get_error_text(buf, sizeof buf)));
CloseHandle(fd);
return false;
}
TRACE_MSG(("post_file::open: create file mapping: size=%ld\n",
size));
void* p = MapViewOfFileEx(md, prot == read_only
&& platform == VER_PLATFORM_WIN32_NT
? FILE_MAP_READ : FILE_MAP_COPY,
0, 0, size, base);
if (p == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to map view of file on "
"address %p: %s\n",
base, get_error_text(buf, sizeof buf)));
p = MapViewOfFileEx(md, prot == read_only
&& platform == VER_PLATFORM_WIN32_NT
? FILE_MAP_READ : FILE_MAP_COPY,
0, 0, size, NULL);
}
if (p == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to map view of file: %s\n",
get_error_text(buf, sizeof buf)));
CloseHandle(md);
CloseHandle(fd);
return false;
}
base = (char*)p;
TRACE_MSG(("post_file::open: map view of file on %p\n", base));
if (prot != read_only && size < max_file_size) {
mapped_size = max_file_size;
vmem = (char*)VirtualAlloc(base + size, mapped_size - size,
MEM_RESERVE, PAGE_READWRITE);
if (vmem == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to allocate end of "
"region: base=%p, size=%ld: %s\n",
base+size, mapped_size-size,
get_error_text(buf, sizeof(buf))));
UnmapViewOfFile(p);
CloseHandle(md);
CloseHandle(fd);
return false;
}
TRACE_MSG(("post_file::open: virtual alloc: address=%p, "
"size=%ld\n", vmem, mapped_size));
assert(vmem == base + size);
}
} else if (mode == map_file) {
mapped_size = (prot == read_only || size > max_file_size)
? size : max_file_size;
md = CreateFileMapping(fd, NULL, PAGE_READWRITE, 0,
mapped_size, NULL);
if (md == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to create file mapping: "
"%s\n", get_error_text(buf, sizeof buf)));
CloseHandle(fd);
return false;
}
TRACE_MSG(("post_file::open: create file mapping: size=%ld\n",
size));
void* p = MapViewOfFileEx(md, prot == read_only
?FILE_MAP_READ :FILE_MAP_ALL_ACCESS,
0, 0, mapped_size, base);
if (p == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to map view of file on "
"address %p: %s\n",
base, get_error_text(buf, sizeof buf)));
p = MapViewOfFileEx(md, prot == read_only
? FILE_MAP_READ : FILE_MAP_ALL_ACCESS,
0, 0, mapped_size, NULL);
}
if (p == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to map view of file: %s\n",
get_error_text(buf, sizeof buf)));
CloseHandle(md);
CloseHandle(fd);
return false;
}
base = (char*)p;
TRACE_MSG(("post_file::open: map view of file on %p\n", base));
} else { // read file to memory
mapped_size = (prot == read_only || size > max_file_size)
? size : max_file_size;
if (!read_file_in_memory()) {
return false;
}
CloseHandle(fd);
fd = INVALID_HANDLE_VALUE;
}
} else {
error_code = GetLastError();
if (error_code != ERROR_FILE_NOT_FOUND) {
TRACE_MSG(("post_file::open: failed to open file '%s': %s\n",
name, get_error_text(buf, sizeof buf)));
return false;
}
TRACE_MSG(("post_file::open: file '%s' not found\n", name));
if (prot == read_only) {
TRACE_MSG(("post_file::open: failed to open in read only mode "
"unexisted file '%s'\n", name));
return false;
}
mapped_size = max_file_size;
base = vmem = (char*)VirtualAlloc(NULL, mapped_size,
MEM_RESERVE, PAGE_READWRITE);
if (base == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::open: failed to virtual alloc: %s\n",
get_error_text(buf, sizeof buf)));
return false;
}
}
}
error_code = ok;
return true;
}
bool post_file::set_size(size_t new_size)
{
if (new_size > mapped_size) {
error_code = file_mapping_size_exceeded;
return false;
}
if (mode == shadow_pages_transaction) {
new_size = ALIGN(new_size, page_size);
if (platform != VER_PLATFORM_WIN32_NT) { // Windows 95, uhh...
if (new_size > allocated_size) {
allocated_size = ALIGN(new_size, allocation_granularity);
if (!VirtualAlloc(base+size, allocated_size-size, MEM_COMMIT,
PAGE_READWRITE))
{
error_code = GetLastError();
return false;
}
size_t page_no = size / page_size;
size_t offs = size;
while (offs < allocated_size) {
dirty_page_map[page_no >> 5] |= 1 << (page_no & 0x1F);
offs += page_size;
page_no += 1;
}
}
}
} else {
if (mode != map_file) {
new_size = ALIGN(new_size, allocation_granularity);
if (new_size > size) {
if (!VirtualAlloc(base+size, new_size-size, MEM_COMMIT,
PAGE_READWRITE))
{
error_code = GetLastError();
return false;
}
}
}
}
size = new_size;
error_code = ok;
return true;
}
bool post_file::set_protection(access_prot prot)
{
DWORD old_prot;
if (platform == VER_PLATFORM_WIN32_NT || mode == map_file) {
if (!VirtualProtect(base, mapped_size,
prot == post_file::read_only
? PAGE_READONLY
: mode == copy_on_write_map
? PAGE_WRITECOPY : PAGE_READWRITE,
&old_prot))
{
error_code = GetLastError();
return false;
}
}
this->prot = prot;
error_code = ok;
return true;
}
bool post_file::commit()
{
DWORD old_prot;
if (mode != shadow_pages_transaction) {
error_code = not_in_transaction;
return false;
}
if (n_locked_pages != 0 || platform != VER_PLATFORM_WIN32_NT) {
if (!flush_log_buffer()) {
return false;
}
}
if (platform == VER_PLATFORM_WIN32_NT) {
if (size > 0 && !FlushViewOfFile(base, size)) {
error_code = GetLastError();
TRACE_MSG(("post_file::commit: FlushViewOfFile(%p, %ld) failed: %d\n",
base, size, error_code));
return false;
}
} else {
if (!write_dirty_pages_in_file()) {
return false;
}
}
if (SetFilePointer(log, 0, NULL, FILE_BEGIN) != 0 || !SetEndOfFile(log)) {
error_code = GetLastError();
TRACE_MSG(("post_file::commit: failed to truncate lof file: %d\n",
error_code));
return false;
}
if (size > 0 && platform == VER_PLATFORM_WIN32_NT && !VirtualProtect(base, size, PAGE_READONLY, &old_prot)){
error_code = GetLastError();
TRACE_MSG(("post_file::commit: VirtualProtect(%p, %ld) failed: %d\n",
base, size, error_code));
return false;
}
error_code = ok;
return true;
}
bool post_file::rollback()
{
if (mode != shadow_pages_transaction) {
error_code = not_in_transaction;
return false;
}
SetFilePointer(log, 0, NULL, FILE_BEGIN);
return recover_file();
}
bool post_file::flush()
{
if (prot == read_only) {
return true;
}
if (mode == shadow_pages_transaction) {
return commit();
} else if (mode == map_file) {
if (!FlushViewOfFile(base, size)) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to flush file mapping: %d\n",
error_code));
return false;
}
error_code = ok;
return true;
} else { // non-shadow_pages_transaction mode
HANDLE tmp_fd = CreateFileA(tmp_name, GENERIC_WRITE, 0, NULL,
CREATE_ALWAYS, FILE_FLAG_SEQUENTIAL_SCAN,
NULL);
if (tmp_fd == INVALID_HANDLE_VALUE) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to create temporary file '%s': "
"%d\n", tmp_name, error_code));
return false;
}
DWORD written_bytes;
if (!WriteFile(tmp_fd, base, size, &written_bytes, NULL)
|| written_bytes != size)
{
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to write %ld bytes to file '%s': "
"%d\n", size, tmp_name, error_code));
CloseHandle(tmp_fd);
return false;
}
CloseHandle(tmp_fd);
if (platform == VER_PLATFORM_WIN32_NT) {
if (fd != INVALID_HANDLE_VALUE) {
assert(md != NULL);
if (!UnmapViewOfFile(base)) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to unmap %p: %d\n",
base, error_code));
return false;
}
if (!CloseHandle(md)) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to close file mapping: "
"%d\n", error_code));
return false;
}
if (!CloseHandle(fd)) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to close file: %d\n",
error_code));
return false;
}
if (!MoveFileExA(tmp_name, name, MOVEFILE_REPLACE_EXISTING|
MOVEFILE_WRITE_THROUGH) != 0)
{
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to reanme fileL %d\n",
error_code));
return false;
}
fd = CreateFileA(name, GENERIC_READ, FILE_SHARE_READ,
NULL, OPEN_EXISTING,
FILE_FLAG_SEQUENTIAL_SCAN, NULL);
if (fd == INVALID_HANDLE_VALUE) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to open file: %d\n",
error_code));
return false;
}
assert(vmem != NULL);
md = CreateFileMapping(fd, NULL, PAGE_WRITECOPY, 0,
vmem - base, NULL);
if (md == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to create file mapping: "
"base=%p, size=%ld: %d\n",
base, vmem - base, error_code));
CloseHandle(fd);
return false;
}
void* p = MapViewOfFileEx(md, FILE_MAP_COPY,
0, 0, vmem - base, base);
if (p == NULL) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to map view of file on "
"address %p size %d: %d\n",
base, vmem-base, error_code));
CloseHandle(fd);
CloseHandle(md);
return false;
}
assert(p == base);
} else { // just rename
if (!MoveFileExA(tmp_name, name, MOVEFILE_REPLACE_EXISTING|
MOVEFILE_WRITE_THROUGH) != 0)
{
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to reanme fileL %d\n",
error_code));
return false;
}
}
} else { // windows 95
if (fd != INVALID_HANDLE_VALUE) {
CloseHandle(fd);
fd = INVALID_HANDLE_VALUE;
}
BOOL backup = MoveFileA(name, sav_name);// may be exists, may be not
if (!backup && GetLastError() == ERROR_ALREADY_EXISTS) {
DeleteFileA(sav_name); // remove previous backup file
backup = MoveFileA(name, sav_name);
if (!backup) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to make backup copy of "
"file '%s'\n", name));
return false;
}
}
if (!MoveFileA(tmp_name, name)) {
error_code = GetLastError();
TRACE_MSG(("post_file::flush: failed to rename file '%s' to '%s'\n",
tmp_name, name));
return false;
}
if (backup) {
DeleteFileA(sav_name);
}
}
error_code = ok;
return true;
}
}
bool post_file::close()
{
if (mode == shadow_pages_transaction) {
post_file *fp, **fpp = &chain;
while ((fp = *fpp) != this) {
fpp = &fp->next;
}
*fpp = fp->next;
if (n_locked_pages != 0 || platform != VER_PLATFORM_WIN32_NT) {
if (!flush_log_buffer()) {
return false;
}
}
if (platform != VER_PLATFORM_WIN32_NT) {
if (!write_dirty_pages_in_file()) {
return false;
}
delete[] dirty_page_map;
}
}
if (vmem != NULL) {
if (!VirtualFree(vmem, 0, MEM_RELEASE)) {
error_code = GetLastError();
TRACE_MSG(("post_file::close: failed to free %p: %d\n",
vmem, error_code));
return false;
}
}
if (md != NULL) {
if (!UnmapViewOfFile(base)) {
error_code = GetLastError();
TRACE_MSG(("post_file::close: failed to unmap %p: %d\n",
base, error_code));
return false;
}
if (!CloseHandle(md)) {
error_code = GetLastError();
TRACE_MSG(("post_file::close: failed to close file mapping: %d\n",
error_code));
return false;
}
}
if ((mode == shadow_pages_transaction
&& platform == VER_PLATFORM_WIN32_NT)
|| mode == map_file)
{
if (SetFilePointer(fd, size, NULL, FILE_BEGIN) != size ||