/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- * vim: sw=2 ts=2 et lcs=trail\:.,tab\:>~ : * This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ #include <string.h> #include "mozilla/Telemetry.h" #include "mozilla/Preferences.h" #include "sqlite3.h" #include "nsThreadUtils.h" #include "mozilla/dom/quota/PersistenceType.h" #include "mozilla/dom/quota/QuotaManager.h" #include "mozilla/dom/quota/QuotaObject.h" #include "mozilla/IOInterposer.h" // The last VFS version for which this file has been updated. #define LAST_KNOWN_VFS_VERSION 3 // The last io_methods version for which this file has been updated. #define LAST_KNOWN_IOMETHODS_VERSION 3 /** * This preference is a workaround to allow users/sysadmins to identify * that the profile exists on an NFS share whose implementation * is incompatible with SQLite's default locking implementation. * Bug 433129 attempted to automatically identify such file-systems, * but a reliable way was not found and it was determined that the fallback * locking is slower than POSIX locking, so we do not want to do it by default. */ #define PREF_NFS_FILESYSTEM "storage.nfs_filesystem" namespace { using namespace mozilla; using namespace mozilla::dom::quota; struct Histograms { const char *name; const Telemetry::ID readB; const Telemetry::ID writeB; const Telemetry::ID readMS; const Telemetry::ID writeMS; const Telemetry::ID syncMS; }; #define SQLITE_TELEMETRY(FILENAME, HGRAM) \ { FILENAME, \ Telemetry::MOZ_SQLITE_ ## HGRAM ## _READ_B, \ Telemetry::MOZ_SQLITE_ ## HGRAM ## _WRITE_B, \ Telemetry::MOZ_SQLITE_ ## HGRAM ## _READ_MS, \ Telemetry::MOZ_SQLITE_ ## HGRAM ## _WRITE_MS, \ Telemetry::MOZ_SQLITE_ ## HGRAM ## _SYNC_MS \ } Histograms gHistograms[] = { SQLITE_TELEMETRY("places.sqlite", PLACES), SQLITE_TELEMETRY("cookies.sqlite", COOKIES), SQLITE_TELEMETRY("webappsstore.sqlite", WEBAPPS), SQLITE_TELEMETRY(nullptr, OTHER) }; #undef SQLITE_TELEMETRY /** RAII class for measuring how long io takes on/off main thread */ class IOThreadAutoTimer { public: /** * IOThreadAutoTimer measures time spent in IO. Additionally it * automatically determines whether IO is happening on the main * thread and picks an appropriate histogram. * * @param id takes a telemetry histogram id. The id+1 must be an * equivalent histogram for the main thread. Eg, MOZ_SQLITE_OPEN_MS * is followed by MOZ_SQLITE_OPEN_MAIN_THREAD_MS. * * @param aOp optionally takes an IO operation to report through the * IOInterposer. Filename will be reported as NULL, and reference will be * either "sqlite-mainthread" or "sqlite-otherthread". */ explicit IOThreadAutoTimer(Telemetry::ID aId, IOInterposeObserver::Operation aOp = IOInterposeObserver::OpNone) : start(TimeStamp::Now()), id(aId), op(aOp) { } /** * This constructor is for when we want to report an operation to * IOInterposer but do not require a telemetry probe. * * @param aOp IO Operation to report through the IOInterposer. */ explicit IOThreadAutoTimer(IOInterposeObserver::Operation aOp) : start(TimeStamp::Now()), id(Telemetry::HistogramCount), op(aOp) { } ~IOThreadAutoTimer() { // We don't report SQLite I/O on Windows because we have a comprehensive // mechanism for intercepting I/O on that platform that captures a superset // of the data captured here. } private: const TimeStamp start; const Telemetry::ID id; IOInterposeObserver::Operation op; }; struct telemetry_file { // Base class. Must be first sqlite3_file base; // histograms pertaining to this file Histograms *histograms; // quota object for this file RefPtr<QuotaObject> quotaObject; // The chunk size for this file. See the documentation for // sqlite3_file_control() and FCNTL_CHUNK_SIZE. int fileChunkSize; // This contains the vfs that actually does work sqlite3_file pReal[1]; }; const char* DatabasePathFromWALPath(const char *zWALName) { /** * Do some sketchy pointer arithmetic to find the parameter key. The WAL * filename is in the middle of a big allocated block that contains: * * - Random Values * - Main Database Path * - \0 * - Multiple URI components consisting of: * - Key * - \0 * - Value * - \0 * - \0 * - Journal Path * - \0 * - WAL Path (zWALName) * - \0 * * Because the main database path is preceded by a random value we have to be * careful when trying to figure out when we should terminate this loop. */ MOZ_ASSERT(zWALName); nsDependentCSubstring dbPath(zWALName, strlen(zWALName)); // Chop off the "-wal" suffix. NS_NAMED_LITERAL_CSTRING(kWALSuffix, "-wal"); MOZ_ASSERT(StringEndsWith(dbPath, kWALSuffix)); dbPath.Rebind(zWALName, dbPath.Length() - kWALSuffix.Length()); MOZ_ASSERT(!dbPath.IsEmpty()); // We want to scan to the end of the key/value URI pairs. Skip the preceding // null and go to the last char of the journal path. const char* cursor = zWALName - 2; // Make sure we just skipped a null. MOZ_ASSERT(!*(cursor + 1)); // Walk backwards over the journal path. while (*cursor) { cursor--; } // There should be another null here. cursor--; MOZ_ASSERT(!*cursor); // Back up one more char to the last char of the previous string. It may be // the database path or it may be a key/value URI pair. cursor--; #ifdef DEBUG { // Verify that we just walked over the journal path. Account for the two // nulls we just skipped. const char *journalStart = cursor + 3; nsDependentCSubstring journalPath(journalStart, strlen(journalStart)); // Chop off the "-journal" suffix. NS_NAMED_LITERAL_CSTRING(kJournalSuffix, "-journal"); MOZ_ASSERT(StringEndsWith(journalPath, kJournalSuffix)); journalPath.Rebind(journalStart, journalPath.Length() - kJournalSuffix.Length()); MOZ_ASSERT(!journalPath.IsEmpty()); // Make sure that the database name is a substring of the journal name. MOZ_ASSERT(journalPath == dbPath); } #endif // Now we're either at the end of the key/value URI pairs or we're at the // end of the database path. Carefully walk backwards one character at a // time to do this safely without running past the beginning of the database // path. const char *const dbPathStart = dbPath.BeginReading(); const char *dbPathCursor = dbPath.EndReading() - 1; bool isDBPath = true; while (true) { MOZ_ASSERT(*dbPathCursor, "dbPathCursor should never see a null char!"); if (isDBPath) { isDBPath = dbPathStart <= dbPathCursor && *dbPathCursor == *cursor && *cursor; } if (!isDBPath) { // This isn't the database path so it must be a value. Scan past it and // the key also. for (size_t stringCount = 0; stringCount < 2; stringCount++) { // Scan past the string to the preceding null character. while (*cursor) { cursor--; } // Back up one more char to the last char of preceding string. cursor--; } // Reset and start again. dbPathCursor = dbPath.EndReading() - 1; isDBPath = true; continue; } MOZ_ASSERT(isDBPath); MOZ_ASSERT(*cursor); if (dbPathStart == dbPathCursor) { // Found the full database path, we're all done. MOZ_ASSERT(nsDependentCString(cursor) == dbPath); return cursor; } // Change the cursors and go through the loop again. cursor--; dbPathCursor--; } MOZ_CRASH("Should never get here!"); } already_AddRefed<QuotaObject> GetQuotaObjectFromNameAndParameters(const char *zName, const char *zURIParameterKey) { MOZ_ASSERT(zName); MOZ_ASSERT(zURIParameterKey); const char *persistenceType = sqlite3_uri_parameter(zURIParameterKey, "persistenceType"); if (!persistenceType) { return nullptr; } const char *group = sqlite3_uri_parameter(zURIParameterKey, "group"); if (!group) { NS_WARNING("SQLite URI had 'persistenceType' but not 'group'?!"); return nullptr; } const char *origin = sqlite3_uri_parameter(zURIParameterKey, "origin"); if (!origin) { NS_WARNING("SQLite URI had 'persistenceType' and 'group' but not " "'origin'?!"); return nullptr; } QuotaManager *quotaManager = QuotaManager::Get(); MOZ_ASSERT(quotaManager); return quotaManager->GetQuotaObject( PersistenceTypeFromText(nsDependentCString(persistenceType)), nsDependentCString(group), nsDependentCString(origin), NS_ConvertUTF8toUTF16(zName)); } void MaybeEstablishQuotaControl(const char *zName, telemetry_file *pFile, int flags) { MOZ_ASSERT(pFile); MOZ_ASSERT(!pFile->quotaObject); if (!(flags & (SQLITE_OPEN_URI | SQLITE_OPEN_WAL))) { return; } MOZ_ASSERT(zName); const char *zURIParameterKey = (flags & SQLITE_OPEN_WAL) ? DatabasePathFromWALPath(zName) : zName; MOZ_ASSERT(zURIParameterKey); pFile->quotaObject = GetQuotaObjectFromNameAndParameters(zName, zURIParameterKey); } /* ** Close a telemetry_file. */ int xClose(sqlite3_file *pFile) { telemetry_file *p = (telemetry_file *)pFile; int rc; { // Scope for IOThreadAutoTimer IOThreadAutoTimer ioTimer(IOInterposeObserver::OpClose); rc = p->pReal->pMethods->xClose(p->pReal); } if( rc==SQLITE_OK ){ delete p->base.pMethods; p->base.pMethods = nullptr; p->quotaObject = nullptr; #ifdef DEBUG p->fileChunkSize = 0; #endif } return rc; } /* ** Read data from a telemetry_file. */ int xRead(sqlite3_file *pFile, void *zBuf, int iAmt, sqlite_int64 iOfst) { telemetry_file *p = (telemetry_file *)pFile; IOThreadAutoTimer ioTimer(p->histograms->readMS, IOInterposeObserver::OpRead); int rc; rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst); // sqlite likes to read from empty files, this is normal, ignore it. return rc; } /* ** Return the current file-size of a telemetry_file. */ int xFileSize(sqlite3_file *pFile, sqlite_int64 *pSize) { IOThreadAutoTimer ioTimer(IOInterposeObserver::OpStat); telemetry_file *p = (telemetry_file *)pFile; int rc; rc = p->pReal->pMethods->xFileSize(p->pReal, pSize); return rc; } /* ** Write data to a telemetry_file. */ int xWrite(sqlite3_file *pFile, const void *zBuf, int iAmt, sqlite_int64 iOfst) { telemetry_file *p = (telemetry_file *)pFile; IOThreadAutoTimer ioTimer(p->histograms->writeMS, IOInterposeObserver::OpWrite); int rc; if (p->quotaObject) { MOZ_ASSERT(INT64_MAX - iOfst >= iAmt); if (!p->quotaObject->MaybeUpdateSize(iOfst + iAmt, /* aTruncate */ false)) { return SQLITE_FULL; } } rc = p->pReal->pMethods->xWrite(p->pReal, zBuf, iAmt, iOfst); if (p->quotaObject && rc != SQLITE_OK) { NS_WARNING("xWrite failed on a quota-controlled file, attempting to " "update its current size..."); sqlite_int64 currentSize; if (xFileSize(pFile, ¤tSize) == SQLITE_OK) { p->quotaObject->MaybeUpdateSize(currentSize, /* aTruncate */ true); } } return rc; } /* ** Truncate a telemetry_file. */ int xTruncate(sqlite3_file *pFile, sqlite_int64 size) { IOThreadAutoTimer ioTimer(Telemetry::MOZ_SQLITE_TRUNCATE_MS); telemetry_file *p = (telemetry_file *)pFile; int rc; if (p->quotaObject) { if (p->fileChunkSize > 0) { // Round up to the smallest multiple of the chunk size that will hold all // the data. size = ((size + p->fileChunkSize - 1) / p->fileChunkSize) * p->fileChunkSize; } if (!p->quotaObject->MaybeUpdateSize(size, /* aTruncate */ true)) { return SQLITE_FULL; } } rc = p->pReal->pMethods->xTruncate(p->pReal, size); if (p->quotaObject) { if (rc == SQLITE_OK) { #ifdef DEBUG // Make sure xTruncate set the size exactly as we calculated above. sqlite_int64 newSize; MOZ_ASSERT(xFileSize(pFile, &newSize) == SQLITE_OK); MOZ_ASSERT(newSize == size); #endif } else { NS_WARNING("xTruncate failed on a quota-controlled file, attempting to " "update its current size..."); if (xFileSize(pFile, &size) == SQLITE_OK) { p->quotaObject->MaybeUpdateSize(size, /* aTruncate */ true); } } } return rc; } /* ** Sync a telemetry_file. */ int xSync(sqlite3_file *pFile, int flags) { telemetry_file *p = (telemetry_file *)pFile; IOThreadAutoTimer ioTimer(p->histograms->syncMS, IOInterposeObserver::OpFSync); return p->pReal->pMethods->xSync(p->pReal, flags); } /* ** Lock a telemetry_file. */ int xLock(sqlite3_file *pFile, int eLock) { telemetry_file *p = (telemetry_file *)pFile; int rc; rc = p->pReal->pMethods->xLock(p->pReal, eLock); return rc; } /* ** Unlock a telemetry_file. */ int xUnlock(sqlite3_file *pFile, int eLock) { telemetry_file *p = (telemetry_file *)pFile; int rc; rc = p->pReal->pMethods->xUnlock(p->pReal, eLock); return rc; } /* ** Check if another file-handle holds a RESERVED lock on a telemetry_file. */ int xCheckReservedLock(sqlite3_file *pFile, int *pResOut) { telemetry_file *p = (telemetry_file *)pFile; int rc = p->pReal->pMethods->xCheckReservedLock(p->pReal, pResOut); return rc; } /* ** File control method. For custom operations on a telemetry_file. */ int xFileControl(sqlite3_file *pFile, int op, void *pArg) { telemetry_file *p = (telemetry_file *)pFile; int rc; // Hook SQLITE_FCNTL_SIZE_HINT for quota-controlled files and do the necessary // work before passing to the SQLite VFS. if (op == SQLITE_FCNTL_SIZE_HINT && p->quotaObject) { sqlite3_int64 hintSize = *static_cast<sqlite3_int64*>(pArg); sqlite3_int64 currentSize; rc = xFileSize(pFile, ¤tSize); if (rc != SQLITE_OK) { return rc; } if (hintSize > currentSize) { rc = xTruncate(pFile, hintSize); if (rc != SQLITE_OK) { return rc; } } } rc = p->pReal->pMethods->xFileControl(p->pReal, op, pArg); // Grab the file chunk size after the SQLite VFS has approved. if (op == SQLITE_FCNTL_CHUNK_SIZE && rc == SQLITE_OK) { p->fileChunkSize = *static_cast<int*>(pArg); } #ifdef DEBUG if (op == SQLITE_FCNTL_SIZE_HINT && p->quotaObject && rc == SQLITE_OK) { sqlite3_int64 hintSize = *static_cast<sqlite3_int64*>(pArg); if (p->fileChunkSize > 0) { hintSize = ((hintSize + p->fileChunkSize - 1) / p->fileChunkSize) * p->fileChunkSize; } sqlite3_int64 currentSize; MOZ_ASSERT(xFileSize(pFile, ¤tSize) == SQLITE_OK); MOZ_ASSERT(currentSize >= hintSize); } #endif return rc; } /* ** Return the sector-size in bytes for a telemetry_file. */ int xSectorSize(sqlite3_file *pFile) { telemetry_file *p = (telemetry_file *)pFile; int rc; rc = p->pReal->pMethods->xSectorSize(p->pReal); return rc; } /* ** Return the device characteristic flags supported by a telemetry_file. */ int xDeviceCharacteristics(sqlite3_file *pFile) { telemetry_file *p = (telemetry_file *)pFile; int rc; rc = p->pReal->pMethods->xDeviceCharacteristics(p->pReal); return rc; } /* ** Shared-memory operations. */ int xShmLock(sqlite3_file *pFile, int ofst, int n, int flags) { telemetry_file *p = (telemetry_file *)pFile; return p->pReal->pMethods->xShmLock(p->pReal, ofst, n, flags); } int xShmMap(sqlite3_file *pFile, int iRegion, int szRegion, int isWrite, void volatile **pp) { telemetry_file *p = (telemetry_file *)pFile; int rc; rc = p->pReal->pMethods->xShmMap(p->pReal, iRegion, szRegion, isWrite, pp); return rc; } void xShmBarrier(sqlite3_file *pFile){ telemetry_file *p = (telemetry_file *)pFile; p->pReal->pMethods->xShmBarrier(p->pReal); } int xShmUnmap(sqlite3_file *pFile, int delFlag){ telemetry_file *p = (telemetry_file *)pFile; int rc; rc = p->pReal->pMethods->xShmUnmap(p->pReal, delFlag); return rc; } int xFetch(sqlite3_file *pFile, sqlite3_int64 iOff, int iAmt, void **pp) { telemetry_file *p = (telemetry_file *)pFile; MOZ_ASSERT(p->pReal->pMethods->iVersion >= 3); return p->pReal->pMethods->xFetch(p->pReal, iOff, iAmt, pp); } int xUnfetch(sqlite3_file *pFile, sqlite3_int64 iOff, void *pResOut) { telemetry_file *p = (telemetry_file *)pFile; MOZ_ASSERT(p->pReal->pMethods->iVersion >= 3); return p->pReal->pMethods->xUnfetch(p->pReal, iOff, pResOut); } int xOpen(sqlite3_vfs* vfs, const char *zName, sqlite3_file* pFile, int flags, int *pOutFlags) { IOThreadAutoTimer ioTimer(Telemetry::MOZ_SQLITE_OPEN_MS, IOInterposeObserver::OpCreateOrOpen); sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); int rc; telemetry_file *p = (telemetry_file *)pFile; Histograms *h = nullptr; // check if the filename is one we are probing for for(size_t i = 0;i < sizeof(gHistograms)/sizeof(gHistograms[0]);i++) { h = &gHistograms[i]; // last probe is the fallback probe if (!h->name) break; if (!zName) continue; const char *match = strstr(zName, h->name); if (!match) continue; char c = match[strlen(h->name)]; // include -wal/-journal too if (!c || c == '-') break; } p->histograms = h; MaybeEstablishQuotaControl(zName, p, flags); rc = orig_vfs->xOpen(orig_vfs, zName, p->pReal, flags, pOutFlags); if( rc != SQLITE_OK ) return rc; if( p->pReal->pMethods ){ sqlite3_io_methods *pNew = new sqlite3_io_methods; const sqlite3_io_methods *pSub = p->pReal->pMethods; memset(pNew, 0, sizeof(*pNew)); // If the io_methods version is higher than the last known one, you should // update this VFS adding appropriate IO methods for any methods added in // the version change. pNew->iVersion = pSub->iVersion; MOZ_ASSERT(pNew->iVersion <= LAST_KNOWN_IOMETHODS_VERSION); pNew->xClose = xClose; pNew->xRead = xRead; pNew->xWrite = xWrite; pNew->xTruncate = xTruncate; pNew->xSync = xSync; pNew->xFileSize = xFileSize; pNew->xLock = xLock; pNew->xUnlock = xUnlock; pNew->xCheckReservedLock = xCheckReservedLock; pNew->xFileControl = xFileControl; pNew->xSectorSize = xSectorSize; pNew->xDeviceCharacteristics = xDeviceCharacteristics; if (pNew->iVersion >= 2) { // Methods added in version 2. pNew->xShmMap = pSub->xShmMap ? xShmMap : 0; pNew->xShmLock = pSub->xShmLock ? xShmLock : 0; pNew->xShmBarrier = pSub->xShmBarrier ? xShmBarrier : 0; pNew->xShmUnmap = pSub->xShmUnmap ? xShmUnmap : 0; } if (pNew->iVersion >= 3) { // Methods added in version 3. // SQLite 3.7.17 calls these methods without checking for nullptr first, // so we always define them. Verify that we're not going to call // nullptrs, though. MOZ_ASSERT(pSub->xFetch); pNew->xFetch = xFetch; MOZ_ASSERT(pSub->xUnfetch); pNew->xUnfetch = xUnfetch; } pFile->pMethods = pNew; } return rc; } int xDelete(sqlite3_vfs* vfs, const char *zName, int syncDir) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); int rc; RefPtr<QuotaObject> quotaObject; if (StringEndsWith(nsDependentCString(zName), NS_LITERAL_CSTRING("-wal"))) { const char *zURIParameterKey = DatabasePathFromWALPath(zName); MOZ_ASSERT(zURIParameterKey); quotaObject = GetQuotaObjectFromNameAndParameters(zName, zURIParameterKey); } rc = orig_vfs->xDelete(orig_vfs, zName, syncDir); if (rc == SQLITE_OK && quotaObject) { MOZ_ALWAYS_TRUE(quotaObject->MaybeUpdateSize(0, /* aTruncate */ true)); } return rc; } int xAccess(sqlite3_vfs *vfs, const char *zName, int flags, int *pResOut) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xAccess(orig_vfs, zName, flags, pResOut); } int xFullPathname(sqlite3_vfs *vfs, const char *zName, int nOut, char *zOut) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xFullPathname(orig_vfs, zName, nOut, zOut); } void* xDlOpen(sqlite3_vfs *vfs, const char *zFilename) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xDlOpen(orig_vfs, zFilename); } void xDlError(sqlite3_vfs *vfs, int nByte, char *zErrMsg) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); orig_vfs->xDlError(orig_vfs, nByte, zErrMsg); } void (*xDlSym(sqlite3_vfs *vfs, void *pHdle, const char *zSym))(void){ sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xDlSym(orig_vfs, pHdle, zSym); } void xDlClose(sqlite3_vfs *vfs, void *pHandle) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); orig_vfs->xDlClose(orig_vfs, pHandle); } int xRandomness(sqlite3_vfs *vfs, int nByte, char *zOut) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xRandomness(orig_vfs, nByte, zOut); } int xSleep(sqlite3_vfs *vfs, int microseconds) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xSleep(orig_vfs, microseconds); } int xCurrentTime(sqlite3_vfs *vfs, double *prNow) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xCurrentTime(orig_vfs, prNow); } int xGetLastError(sqlite3_vfs *vfs, int nBuf, char *zBuf) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xGetLastError(orig_vfs, nBuf, zBuf); } int xCurrentTimeInt64(sqlite3_vfs *vfs, sqlite3_int64 *piNow) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xCurrentTimeInt64(orig_vfs, piNow); } static int xSetSystemCall(sqlite3_vfs *vfs, const char *zName, sqlite3_syscall_ptr pFunc) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xSetSystemCall(orig_vfs, zName, pFunc); } static sqlite3_syscall_ptr xGetSystemCall(sqlite3_vfs *vfs, const char *zName) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xGetSystemCall(orig_vfs, zName); } static const char * xNextSystemCall(sqlite3_vfs *vfs, const char *zName) { sqlite3_vfs *orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); return orig_vfs->xNextSystemCall(orig_vfs, zName); } } // namespace namespace mozilla { namespace storage { sqlite3_vfs* ConstructTelemetryVFS() { #if defined(XP_WIN) #define EXPECTED_VFS "win32" #define EXPECTED_VFS_NFS "win32" #else #define EXPECTED_VFS "unix" #define EXPECTED_VFS_NFS "unix-excl" #endif bool expected_vfs; sqlite3_vfs *vfs; if (Preferences::GetBool(PREF_NFS_FILESYSTEM)) { vfs = sqlite3_vfs_find(EXPECTED_VFS_NFS); expected_vfs = (vfs != nullptr); } else { vfs = sqlite3_vfs_find(nullptr); expected_vfs = vfs->zName && !strcmp(vfs->zName, EXPECTED_VFS); } if (!expected_vfs) { return nullptr; } sqlite3_vfs *tvfs = new ::sqlite3_vfs; memset(tvfs, 0, sizeof(::sqlite3_vfs)); // If the VFS version is higher than the last known one, you should update // this VFS adding appropriate methods for any methods added in the version // change. tvfs->iVersion = vfs->iVersion; MOZ_ASSERT(vfs->iVersion <= LAST_KNOWN_VFS_VERSION); tvfs->szOsFile = sizeof(telemetry_file) - sizeof(sqlite3_file) + vfs->szOsFile; tvfs->mxPathname = vfs->mxPathname; tvfs->zName = "telemetry-vfs"; tvfs->pAppData = vfs; tvfs->xOpen = xOpen; tvfs->xDelete = xDelete; tvfs->xAccess = xAccess; tvfs->xFullPathname = xFullPathname; tvfs->xDlOpen = xDlOpen; tvfs->xDlError = xDlError; tvfs->xDlSym = xDlSym; tvfs->xDlClose = xDlClose; tvfs->xRandomness = xRandomness; tvfs->xSleep = xSleep; tvfs->xCurrentTime = xCurrentTime; tvfs->xGetLastError = xGetLastError; if (tvfs->iVersion >= 2) { // Methods added in version 2. tvfs->xCurrentTimeInt64 = xCurrentTimeInt64; } if (tvfs->iVersion >= 3) { // Methods added in version 3. tvfs->xSetSystemCall = xSetSystemCall; tvfs->xGetSystemCall = xGetSystemCall; tvfs->xNextSystemCall = xNextSystemCall; } return tvfs; } already_AddRefed<QuotaObject> GetQuotaObjectForFile(sqlite3_file *pFile) { MOZ_ASSERT(pFile); telemetry_file *p = (telemetry_file *)pFile; RefPtr<QuotaObject> result = p->quotaObject; return result.forget(); } } // namespace storage } // namespace mozilla