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Diffstat (limited to '')
| -rw-r--r-- | storage/QuotaVFS.cpp | 621 |
1 files changed, 621 insertions, 0 deletions
diff --git a/storage/QuotaVFS.cpp b/storage/QuotaVFS.cpp new file mode 100644 index 0000000000..b9490ff0d5 --- /dev/null +++ b/storage/QuotaVFS.cpp @@ -0,0 +1,621 @@ +/* -*- 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 "QuotaVFS.h" + +#include "mozilla/dom/quota/PersistenceType.h" +#include "mozilla/dom/quota/QuotaManager.h" +#include "mozilla/dom/quota/QuotaObject.h" +#include "mozilla/dom/quota/ResultExtensions.h" +#include "mozilla/StaticPrefs_storage.h" +#include "nsDirectoryServiceDefs.h" +#include "nsEscape.h" +#include "sqlite3.h" + +#if defined(XP_WIN) || defined(XP_UNIX) +# include "mozilla/StaticPrefs_dom.h" +#endif + +// 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 + +namespace { + +using namespace mozilla; +using namespace mozilla::dom::quota; + +struct QuotaFile { + // Base class. Must be first + sqlite3_file base; + + // 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]; +}; + +already_AddRefed<QuotaObject> GetQuotaObjectFromName(const char* zName) { + MOZ_ASSERT(zName); + + const char* directoryLockIdParam = + sqlite3_uri_parameter(zName, "directoryLockId"); + if (!directoryLockIdParam) { + return nullptr; + } + + nsresult rv; + const int64_t directoryLockId = + nsDependentCString(directoryLockIdParam).ToInteger64(&rv); + MOZ_RELEASE_ASSERT(NS_SUCCEEDED(rv)); + + QuotaManager* quotaManager = QuotaManager::Get(); + MOZ_ASSERT(quotaManager); + + return quotaManager->GetQuotaObject(directoryLockId, + NS_ConvertUTF8toUTF16(zName)); +} + +void MaybeEstablishQuotaControl(const char* zName, QuotaFile* pFile, + int flags) { + MOZ_ASSERT(pFile); + MOZ_ASSERT(!pFile->quotaObject); + + if (!(flags & (SQLITE_OPEN_URI | SQLITE_OPEN_WAL))) { + return; + } + pFile->quotaObject = GetQuotaObjectFromName(zName); +} + +/* +** Close a QuotaFile. +*/ +int QuotaClose(sqlite3_file* pFile) { + QuotaFile* p = (QuotaFile*)pFile; + int rc; + 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 QuotaFile. +*/ +int QuotaRead(sqlite3_file* pFile, void* zBuf, int iAmt, sqlite_int64 iOfst) { + QuotaFile* p = (QuotaFile*)pFile; + int rc; + rc = p->pReal->pMethods->xRead(p->pReal, zBuf, iAmt, iOfst); + return rc; +} + +/* +** Return the current file-size of a QuotaFile. +*/ +int QuotaFileSize(sqlite3_file* pFile, sqlite_int64* pSize) { + QuotaFile* p = (QuotaFile*)pFile; + int rc; + rc = p->pReal->pMethods->xFileSize(p->pReal, pSize); + return rc; +} + +/* +** Write data to a QuotaFile. +*/ +int QuotaWrite(sqlite3_file* pFile, const void* zBuf, int iAmt, + sqlite_int64 iOfst) { + QuotaFile* p = (QuotaFile*)pFile; + 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 (QuotaFileSize(pFile, ¤tSize) == SQLITE_OK) { + DebugOnly<bool> res = + p->quotaObject->MaybeUpdateSize(currentSize, /* aTruncate */ true); + MOZ_ASSERT(res); + } + } + return rc; +} + +/* +** Truncate a QuotaFile. +*/ +int QuotaTruncate(sqlite3_file* pFile, sqlite_int64 size) { + QuotaFile* p = (QuotaFile*)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(QuotaFileSize(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 (QuotaFileSize(pFile, &size) == SQLITE_OK) { + DebugOnly<bool> res = + p->quotaObject->MaybeUpdateSize(size, /* aTruncate */ true); + MOZ_ASSERT(res); + } + } + } + return rc; +} + +/* +** Sync a QuotaFile. +*/ +int QuotaSync(sqlite3_file* pFile, int flags) { + QuotaFile* p = (QuotaFile*)pFile; + return p->pReal->pMethods->xSync(p->pReal, flags); +} + +/* +** Lock a QuotaFile. +*/ +int QuotaLock(sqlite3_file* pFile, int eLock) { + QuotaFile* p = (QuotaFile*)pFile; + int rc; + rc = p->pReal->pMethods->xLock(p->pReal, eLock); + return rc; +} + +/* +** Unlock a QuotaFile. +*/ +int QuotaUnlock(sqlite3_file* pFile, int eLock) { + QuotaFile* p = (QuotaFile*)pFile; + int rc; + rc = p->pReal->pMethods->xUnlock(p->pReal, eLock); + return rc; +} + +/* +** Check if another file-handle holds a RESERVED lock on a QuotaFile. +*/ +int QuotaCheckReservedLock(sqlite3_file* pFile, int* pResOut) { + QuotaFile* p = (QuotaFile*)pFile; + int rc = p->pReal->pMethods->xCheckReservedLock(p->pReal, pResOut); + return rc; +} + +/* +** File control method. For custom operations on a QuotaFile. +*/ +int QuotaFileControl(sqlite3_file* pFile, int op, void* pArg) { + QuotaFile* p = (QuotaFile*)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 = QuotaFileSize(pFile, ¤tSize); + if (rc != SQLITE_OK) { + return rc; + } + if (hintSize > currentSize) { + rc = QuotaTruncate(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(QuotaFileSize(pFile, ¤tSize) == SQLITE_OK); + MOZ_ASSERT(currentSize >= hintSize); + } +#endif + return rc; +} + +/* +** Return the sector-size in bytes for a QuotaFile. +*/ +int QuotaSectorSize(sqlite3_file* pFile) { + QuotaFile* p = (QuotaFile*)pFile; + int rc; + rc = p->pReal->pMethods->xSectorSize(p->pReal); + return rc; +} + +/* +** Return the device characteristic flags supported by a QuotaFile. +*/ +int QuotaDeviceCharacteristics(sqlite3_file* pFile) { + QuotaFile* p = (QuotaFile*)pFile; + int rc; + rc = p->pReal->pMethods->xDeviceCharacteristics(p->pReal); + return rc; +} + +/* +** Shared-memory operations. +*/ +int QuotaShmLock(sqlite3_file* pFile, int ofst, int n, int flags) { + QuotaFile* p = (QuotaFile*)pFile; + return p->pReal->pMethods->xShmLock(p->pReal, ofst, n, flags); +} + +int QuotaShmMap(sqlite3_file* pFile, int iRegion, int szRegion, int isWrite, + void volatile** pp) { + QuotaFile* p = (QuotaFile*)pFile; + int rc; + rc = p->pReal->pMethods->xShmMap(p->pReal, iRegion, szRegion, isWrite, pp); + return rc; +} + +void QuotaShmBarrier(sqlite3_file* pFile) { + QuotaFile* p = (QuotaFile*)pFile; + p->pReal->pMethods->xShmBarrier(p->pReal); +} + +int QuotaShmUnmap(sqlite3_file* pFile, int delFlag) { + QuotaFile* p = (QuotaFile*)pFile; + int rc; + rc = p->pReal->pMethods->xShmUnmap(p->pReal, delFlag); + return rc; +} + +int QuotaFetch(sqlite3_file* pFile, sqlite3_int64 iOff, int iAmt, void** pp) { + QuotaFile* p = (QuotaFile*)pFile; + MOZ_ASSERT(p->pReal->pMethods->iVersion >= 3); + return p->pReal->pMethods->xFetch(p->pReal, iOff, iAmt, pp); +} + +int QuotaUnfetch(sqlite3_file* pFile, sqlite3_int64 iOff, void* pResOut) { + QuotaFile* p = (QuotaFile*)pFile; + MOZ_ASSERT(p->pReal->pMethods->iVersion >= 3); + return p->pReal->pMethods->xUnfetch(p->pReal, iOff, pResOut); +} + +int QuotaOpen(sqlite3_vfs* vfs, const char* zName, sqlite3_file* pFile, + int flags, int* pOutFlags) { + sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); + int rc; + QuotaFile* p = (QuotaFile*)pFile; + + 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 = QuotaClose; + pNew->xRead = QuotaRead; + pNew->xWrite = QuotaWrite; + pNew->xTruncate = QuotaTruncate; + pNew->xSync = QuotaSync; + pNew->xFileSize = QuotaFileSize; + pNew->xLock = QuotaLock; + pNew->xUnlock = QuotaUnlock; + pNew->xCheckReservedLock = QuotaCheckReservedLock; + pNew->xFileControl = QuotaFileControl; + pNew->xSectorSize = QuotaSectorSize; + pNew->xDeviceCharacteristics = QuotaDeviceCharacteristics; + if (pNew->iVersion >= 2) { + // Methods added in version 2. + pNew->xShmMap = pSub->xShmMap ? QuotaShmMap : nullptr; + pNew->xShmLock = pSub->xShmLock ? QuotaShmLock : nullptr; + pNew->xShmBarrier = pSub->xShmBarrier ? QuotaShmBarrier : nullptr; + pNew->xShmUnmap = pSub->xShmUnmap ? QuotaShmUnmap : nullptr; + } + 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 = QuotaFetch; + MOZ_ASSERT(pSub->xUnfetch); + pNew->xUnfetch = QuotaUnfetch; + } + pFile->pMethods = pNew; + } + return rc; +} + +int QuotaDelete(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), "-wal"_ns)) { + quotaObject = GetQuotaObjectFromName(zName); + } + + rc = orig_vfs->xDelete(orig_vfs, zName, syncDir); + if (rc == SQLITE_OK && quotaObject) { + MOZ_ALWAYS_TRUE(quotaObject->MaybeUpdateSize(0, /* aTruncate */ true)); + } + + return rc; +} + +int QuotaAccess(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 QuotaFullPathname(sqlite3_vfs* vfs, const char* zName, int nOut, + char* zOut) { +#if defined(XP_WIN) + // SQLite uses GetFullPathnameW which also normailizes file path. If a file + // component ends with a dot, it would be removed. However, it's not desired. + // + // And that would result SQLite uses wrong database and quotaObject. + // Note that we are safe to avoid the GetFullPathnameW call for \\?\ prefixed + // paths. + // And note that this hack will be removed once the issue is fixed directly in + // SQLite. + + // zName that starts with "//?/" is the case when a file URI was passed and + // zName that starts with "\\?\" is the case when a normal path was passed + // (not file URI). + if (StaticPrefs::dom_quotaManager_overrideXFullPathname() && + ((zName[0] == '/' && zName[1] == '/' && zName[2] == '?' && + zName[3] == '/') || + (zName[0] == '\\' && zName[1] == '\\' && zName[2] == '?' && + zName[3] == '\\'))) { + MOZ_ASSERT(nOut >= vfs->mxPathname); + MOZ_ASSERT(static_cast<size_t>(nOut) > strlen(zName)); + + size_t index = 0; + while (zName[index] != '\0') { + if (zName[index] == '/') { + zOut[index] = '\\'; + } else { + zOut[index] = zName[index]; + } + + index++; + } + zOut[index] = '\0'; + + return SQLITE_OK; + } +#elif defined(XP_UNIX) + // SQLite canonicalizes (resolves path components) file paths on Unix which + // doesn't work well with file path sanity checks in quota manager. This is + // especially a problem on mac where /var is a symlink to /private/var. + // Since QuotaVFS is used only by quota clients which never access databases + // outside of PROFILE/storage, we override Unix xFullPathname with own + // implementation that doesn't do any canonicalization. + + if (StaticPrefs::dom_quotaManager_overrideXFullPathnameUnix()) { + if (nOut < 0) { + // Match the return code used by SQLite's xFullPathname implementation + // here and below. + return SQLITE_CANTOPEN; + } + + QM_TRY_INSPECT( + const auto& path, ([&zName]() -> Result<nsString, nsresult> { + NS_ConvertUTF8toUTF16 name(zName); + + if (name.First() == '/') { + return std::move(name); + } + + QM_TRY_INSPECT(const auto& file, + MOZ_TO_RESULT_INVOKE_TYPED(nsCOMPtr<nsIFile>, + NS_GetSpecialDirectory, + NS_OS_CURRENT_WORKING_DIR)); + + QM_TRY(MOZ_TO_RESULT(file->Append(name))); + + QM_TRY_RETURN( + MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(nsString, file, GetPath)); + }()), + SQLITE_CANTOPEN); + + QM_TRY_INSPECT(const auto& quotaFile, QM_NewLocalFile(path), + SQLITE_CANTOPEN); + + QM_TRY_INSPECT( + const auto& quotaPath, + MOZ_TO_RESULT_INVOKE_MEMBER_TYPED(nsString, quotaFile, GetPath), + SQLITE_CANTOPEN); + + NS_ConvertUTF16toUTF8 sqlitePath(quotaPath); + + if (sqlitePath.Length() > (unsigned int)nOut) { + return SQLITE_CANTOPEN; + } + + nsCharTraits<char>::copy(zOut, sqlitePath.get(), sqlitePath.Length()); + zOut[sqlitePath.Length()] = '\0'; + + return SQLITE_OK; + } +#endif + + sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); + return orig_vfs->xFullPathname(orig_vfs, zName, nOut, zOut); +} + +void* QuotaDlOpen(sqlite3_vfs* vfs, const char* zFilename) { + sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); + return orig_vfs->xDlOpen(orig_vfs, zFilename); +} + +void QuotaDlError(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 (*QuotaDlSym(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 QuotaDlClose(sqlite3_vfs* vfs, void* pHandle) { + sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); + orig_vfs->xDlClose(orig_vfs, pHandle); +} + +int QuotaRandomness(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 QuotaSleep(sqlite3_vfs* vfs, int microseconds) { + sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); + return orig_vfs->xSleep(orig_vfs, microseconds); +} + +int QuotaCurrentTime(sqlite3_vfs* vfs, double* prNow) { + sqlite3_vfs* orig_vfs = static_cast<sqlite3_vfs*>(vfs->pAppData); + return orig_vfs->xCurrentTime(orig_vfs, prNow); +} + +int QuotaGetLastError(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 QuotaCurrentTimeInt64(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 QuotaSetSystemCall(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 QuotaGetSystemCall(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* QuotaNextSystemCall(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::storage::quotavfs { + +const char* GetVFSName() { return "quotavfs"; } + +UniquePtr<sqlite3_vfs> ConstructVFS(const char* aBaseVFSName) { + MOZ_ASSERT(aBaseVFSName); + + if (sqlite3_vfs_find(GetVFSName()) != nullptr) { + return nullptr; + } + sqlite3_vfs* vfs = sqlite3_vfs_find(aBaseVFSName); + if (!vfs) { + return nullptr; + } + + auto qvfs = MakeUnique<sqlite3_vfs>(); + memset(qvfs.get(), 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. + qvfs->iVersion = vfs->iVersion; + MOZ_ASSERT(vfs->iVersion <= LAST_KNOWN_VFS_VERSION); + qvfs->szOsFile = static_cast<int>(sizeof(QuotaFile) - sizeof(sqlite3_file) + + vfs->szOsFile); + qvfs->mxPathname = vfs->mxPathname; + qvfs->zName = GetVFSName(); + qvfs->pAppData = vfs; + qvfs->xOpen = QuotaOpen; + qvfs->xDelete = QuotaDelete; + qvfs->xAccess = QuotaAccess; + qvfs->xFullPathname = QuotaFullPathname; + qvfs->xDlOpen = QuotaDlOpen; + qvfs->xDlError = QuotaDlError; + qvfs->xDlSym = QuotaDlSym; + qvfs->xDlClose = QuotaDlClose; + qvfs->xRandomness = QuotaRandomness; + qvfs->xSleep = QuotaSleep; + qvfs->xCurrentTime = QuotaCurrentTime; + qvfs->xGetLastError = QuotaGetLastError; + if (qvfs->iVersion >= 2) { + // Methods added in version 2. + qvfs->xCurrentTimeInt64 = QuotaCurrentTimeInt64; + } + if (qvfs->iVersion >= 3) { + // Methods added in version 3. + qvfs->xSetSystemCall = QuotaSetSystemCall; + qvfs->xGetSystemCall = QuotaGetSystemCall; + qvfs->xNextSystemCall = QuotaNextSystemCall; + } + return qvfs; +} + +already_AddRefed<QuotaObject> GetQuotaObjectForFile(sqlite3_file* pFile) { + MOZ_ASSERT(pFile); + + QuotaFile* p = (QuotaFile*)pFile; + RefPtr<QuotaObject> result = p->quotaObject; + return result.forget(); +} + +} // namespace mozilla::storage::quotavfs |