mirror of
https://github.com/mozilla/gecko-dev.git
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244 lines
8.3 KiB
C++
244 lines
8.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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* vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ :
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "BaseVFS.h"
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#include <string.h>
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#include "sqlite3.h"
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namespace {
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// The last VFS version for which this file has been updated.
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constexpr int kLastKnowVfsVersion = 3;
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// The last io_methods version for which this file has been updated.
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constexpr int kLastKnownIOMethodsVersion = 3;
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using namespace mozilla;
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struct BaseFile {
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// Base class. Must be first
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sqlite3_file base;
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// This points to the underlying sqlite3_file
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sqlite3_file pReal[1];
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};
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int BaseClose(sqlite3_file* pFile) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xClose(p->pReal);
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}
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int BaseRead(sqlite3_file* pFile, void* zBuf, int iAmt, sqlite_int64 iOfst) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst);
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}
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int BaseWrite(sqlite3_file* pFile, const void* zBuf, int iAmt,
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sqlite_int64 iOfst) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xWrite(p->pReal, zBuf, iAmt, iOfst);
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}
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int BaseTruncate(sqlite3_file* pFile, sqlite_int64 size) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xTruncate(p->pReal, size);
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}
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int BaseSync(sqlite3_file* pFile, int flags) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xSync(p->pReal, flags);
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}
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int BaseFileSize(sqlite3_file* pFile, sqlite_int64* pSize) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xFileSize(p->pReal, pSize);
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}
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int BaseLock(sqlite3_file* pFile, int eLock) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xLock(p->pReal, eLock);
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}
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int BaseUnlock(sqlite3_file* pFile, int eLock) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xUnlock(p->pReal, eLock);
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}
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int BaseCheckReservedLock(sqlite3_file* pFile, int* pResOut) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xCheckReservedLock(p->pReal, pResOut);
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}
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int BaseFileControl(sqlite3_file* pFile, int op, void* pArg) {
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#if defined(MOZ_SQLITE_PERSIST_AUXILIARY_FILES)
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// Persist auxiliary files (-shm and -wal) on disk, because creating and
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// deleting them may be expensive on slow storage.
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// Only do this when there is a journal size limit, so the journal is
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// truncated instead of deleted on shutdown, that feels safer if the user
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// moves a database file around without its auxiliary files.
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MOZ_ASSERT(
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::sqlite3_compileoption_used("DEFAULT_JOURNAL_SIZE_LIMIT"),
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"A journal size limit ensures the journal is truncated on shutdown");
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if (op == SQLITE_FCNTL_PERSIST_WAL) {
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*static_cast<int*>(pArg) = 1;
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return SQLITE_OK;
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}
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#endif
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xFileControl(p->pReal, op, pArg);
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}
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int BaseSectorSize(sqlite3_file* pFile) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xSectorSize(p->pReal);
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}
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int BaseDeviceCharacteristics(sqlite3_file* pFile) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xDeviceCharacteristics(p->pReal);
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}
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int BaseShmMap(sqlite3_file* pFile, int iPg, int pgsz, int bExtend,
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void volatile** pp) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xShmMap(p->pReal, iPg, pgsz, bExtend, pp);
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}
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int BaseShmLock(sqlite3_file* pFile, int offset, int n, int flags) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xShmLock(p->pReal, offset, n, flags);
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}
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void BaseShmBarrier(sqlite3_file* pFile) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xShmBarrier(p->pReal);
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}
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int BaseShmUnmap(sqlite3_file* pFile, int deleteFlag) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xShmUnmap(p->pReal, deleteFlag);
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}
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int BaseFetch(sqlite3_file* pFile, sqlite3_int64 iOfst, int iAmt, void** pp) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xFetch(p->pReal, iOfst, iAmt, pp);
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}
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int BaseUnfetch(sqlite3_file* pFile, sqlite3_int64 iOfst, void* pPage) {
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BaseFile* p = (BaseFile*)pFile;
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return p->pReal->pMethods->xUnfetch(p->pReal, iOfst, pPage);
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}
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int BaseOpen(sqlite3_vfs* vfs, const char* zName, sqlite3_file* pFile,
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int flags, int* pOutFlags) {
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BaseFile* p = (BaseFile*)pFile;
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sqlite3_vfs* origVfs = (sqlite3_vfs*)(vfs->pAppData);
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int rc = origVfs->xOpen(origVfs, zName, p->pReal, flags, pOutFlags);
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if (rc) {
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return rc;
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}
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if (p->pReal->pMethods) {
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// If the io_methods version is higher than the last known one, you should
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// update this VFS adding appropriate IO methods for any methods added in
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// the version change.
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MOZ_ASSERT(p->pReal->pMethods->iVersion == kLastKnownIOMethodsVersion);
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static const sqlite3_io_methods IOmethods = {
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kLastKnownIOMethodsVersion, /* iVersion */
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BaseClose, /* xClose */
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BaseRead, /* xRead */
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BaseWrite, /* xWrite */
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BaseTruncate, /* xTruncate */
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BaseSync, /* xSync */
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BaseFileSize, /* xFileSize */
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BaseLock, /* xLock */
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BaseUnlock, /* xUnlock */
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BaseCheckReservedLock, /* xCheckReservedLock */
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BaseFileControl, /* xFileControl */
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BaseSectorSize, /* xSectorSize */
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BaseDeviceCharacteristics, /* xDeviceCharacteristics */
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BaseShmMap, /* xShmMap */
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BaseShmLock, /* xShmLock */
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BaseShmBarrier, /* xShmBarrier */
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BaseShmUnmap, /* xShmUnmap */
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BaseFetch, /* xFetch */
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BaseUnfetch /* xUnfetch */
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};
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pFile->pMethods = &IOmethods;
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}
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return SQLITE_OK;
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}
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} // namespace
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namespace mozilla::storage::basevfs {
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const char* GetVFSName(bool exclusive) {
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return exclusive ? "base-vfs-excl" : "base-vfs";
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}
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UniquePtr<sqlite3_vfs> ConstructVFS(bool exclusive) {
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#if defined(XP_WIN)
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# define EXPECTED_VFS "win32"
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# define EXPECTED_VFS_EXCL "win32"
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#else
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# define EXPECTED_VFS "unix"
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# define EXPECTED_VFS_EXCL "unix-excl"
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#endif
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if (sqlite3_vfs_find(GetVFSName(exclusive))) {
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return nullptr;
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}
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bool found;
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sqlite3_vfs* origVfs;
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if (!exclusive) {
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// Use the non-exclusive VFS.
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origVfs = sqlite3_vfs_find(nullptr);
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found = origVfs && origVfs->zName && !strcmp(origVfs->zName, EXPECTED_VFS);
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} else {
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origVfs = sqlite3_vfs_find(EXPECTED_VFS_EXCL);
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found = (origVfs != nullptr);
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}
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if (!found) {
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return nullptr;
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}
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// If the VFS version is higher than the last known one, you should update
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// this VFS adding appropriate methods for any methods added in the version
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// change.
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MOZ_ASSERT(origVfs->iVersion == kLastKnowVfsVersion);
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sqlite3_vfs vfs = {
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kLastKnowVfsVersion, /* iVersion */
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origVfs->szOsFile + static_cast<int>(sizeof(BaseFile)), /* szOsFile */
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origVfs->mxPathname, /* mxPathname */
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nullptr, /* pNext */
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GetVFSName(exclusive), /* zName */
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origVfs, /* pAppData */
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BaseOpen, /* xOpen */
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origVfs->xDelete, /* xDelete */
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origVfs->xAccess, /* xAccess */
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origVfs->xFullPathname, /* xFullPathname */
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origVfs->xDlOpen, /* xDlOpen */
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origVfs->xDlError, /* xDlError */
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origVfs->xDlSym, /* xDlSym */
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origVfs->xDlClose, /* xDlClose */
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origVfs->xRandomness, /* xRandomness */
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origVfs->xSleep, /* xSleep */
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origVfs->xCurrentTime, /* xCurrentTime */
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origVfs->xGetLastError, /* xGetLastError */
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origVfs->xCurrentTimeInt64, /* xCurrentTimeInt64 */
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origVfs->xSetSystemCall, /* xSetSystemCall */
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origVfs->xGetSystemCall, /* xGetSystemCall */
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origVfs->xNextSystemCall /* xNextSystemCall */
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};
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return MakeUnique<sqlite3_vfs>(vfs);
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}
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} // namespace mozilla::storage::basevfs
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