diff options
Diffstat (limited to 'src/os_win.c')
| -rw-r--r-- | src/os_win.c | 295 |
1 files changed, 284 insertions, 11 deletions
diff --git a/src/os_win.c b/src/os_win.c index 4fb6b02a8..12eefed8b 100644 --- a/src/os_win.c +++ b/src/os_win.c @@ -150,11 +150,20 @@ struct winFile { winceLock local; /* Locks obtained by this instance of winFile */ winceLock *shared; /* Global shared lock memory for the file */ #endif +#if SQLITE_MAX_MMAP_SIZE>0 + int nFetchOut; /* Number of outstanding xFetch references */ + HANDLE hMap; /* Handle for accessing memory mapping */ + void *pMapRegion; /* Area memory mapped */ + sqlite3_int64 mmapSize; /* Usable size of mapped region */ + sqlite3_int64 mmapSizeActual; /* Actual size of mapped region */ + sqlite3_int64 mmapSizeMax; /* Configured FCNTL_MMAP_SIZE value */ +#endif }; /* ** Allowed values for winFile.ctrlFlags */ +#define WINFILE_RDONLY 0x02 /* Connection is read only */ #define WINFILE_PERSIST_WAL 0x04 /* Persistent WAL mode */ #define WINFILE_PSOW 0x10 /* SQLITE_IOCAP_POWERSAFE_OVERWRITE */ @@ -2061,6 +2070,11 @@ static int seekWinFile(winFile *pFile, sqlite3_int64 iOffset){ #endif } +#if SQLITE_MAX_MMAP_SIZE>0 +/* Forward references to VFS methods */ +static int winUnmapfile(winFile*); +#endif + /* ** Close a file. ** @@ -2082,6 +2096,12 @@ static int winClose(sqlite3_file *id){ #endif OSTRACE(("CLOSE %d\n", pFile->h)); assert( pFile->h!=NULL && pFile->h!=INVALID_HANDLE_VALUE ); + +#if SQLITE_MAX_MMAP_SIZE>0 + rc = winUnmapfile(pFile); + if( rc!=SQLITE_OK ) return rc; +#endif + do{ rc = osCloseHandle(pFile->h); /* SimulateIOError( rc=0; cnt=MX_CLOSE_ATTEMPT; ); */ @@ -2130,9 +2150,27 @@ static int winRead( int nRetry = 0; /* Number of retrys */ assert( id!=0 ); + assert( amt>0 ); SimulateIOError(return SQLITE_IOERR_READ); OSTRACE(("READ %d lock=%d\n", pFile->h, pFile->locktype)); +#if SQLITE_MAX_MMAP_SIZE>0 + /* Deal with as much of this read request as possible by transfering + ** data from the memory mapping using memcpy(). */ + if( offset<pFile->mmapSize ){ + if( offset+amt <= pFile->mmapSize ){ + memcpy(pBuf, &((u8 *)(pFile->pMapRegion))[offset], amt); + return SQLITE_OK; + }else{ + int nCopy = (int)(pFile->mmapSize - offset); + memcpy(pBuf, &((u8 *)(pFile->pMapRegion))[offset], nCopy); + pBuf = &((u8 *)pBuf)[nCopy]; + amt -= nCopy; + offset += nCopy; + } + } +#endif + #if SQLITE_OS_WINCE if( seekWinFile(pFile, offset) ){ return SQLITE_FULL; @@ -2182,6 +2220,23 @@ static int winWrite( OSTRACE(("WRITE %d lock=%d\n", pFile->h, pFile->locktype)); +#if SQLITE_MAX_MMAP_SIZE>0 + /* Deal with as much of this write request as possible by transfering + ** data from the memory mapping using memcpy(). */ + if( offset<pFile->mmapSize ){ + if( offset+amt <= pFile->mmapSize ){ + memcpy(&((u8 *)(pFile->pMapRegion))[offset], pBuf, amt); + return SQLITE_OK; + }else{ + int nCopy = (int)(pFile->mmapSize - offset); + memcpy(&((u8 *)(pFile->pMapRegion))[offset], pBuf, nCopy); + pBuf = &((u8 *)pBuf)[nCopy]; + amt -= nCopy; + offset += nCopy; + } + } +#endif + #if SQLITE_OS_WINCE rc = seekWinFile(pFile, offset); if( rc==0 ){ @@ -2249,6 +2304,7 @@ static int winWrite( static int winTruncate(sqlite3_file *id, sqlite3_int64 nByte){ winFile *pFile = (winFile*)id; /* File handle object */ int rc = SQLITE_OK; /* Return code for this function */ + DWORD lastErrno; assert( pFile ); @@ -2267,12 +2323,23 @@ static int winTruncate(sqlite3_file *id, sqlite3_int64 nByte){ /* SetEndOfFile() returns non-zero when successful, or zero when it fails. */ if( seekWinFile(pFile, nByte) ){ rc = winLogError(SQLITE_IOERR_TRUNCATE, pFile->lastErrno, - "winTruncate1", pFile->zPath); - }else if( 0==osSetEndOfFile(pFile->h) ){ - pFile->lastErrno = osGetLastError(); + "winTruncate1", pFile->zPath); + }else if( 0==osSetEndOfFile(pFile->h) && + ((lastErrno = osGetLastError())!=ERROR_USER_MAPPED_FILE) ){ + pFile->lastErrno = lastErrno; rc = winLogError(SQLITE_IOERR_TRUNCATE, pFile->lastErrno, - "winTruncate2", pFile->zPath); + "winTruncate2", pFile->zPath); + } + +#if SQLITE_MAX_MMAP_SIZE>0 + /* If the file was truncated to a size smaller than the currently + ** mapped region, reduce the effective mapping size as well. SQLite will + ** use read() and write() to access data beyond this point from now on. + */ + if( pFile->pMapRegion && nByte<pFile->mmapSize ){ + pFile->mmapSize = nByte; } +#endif OSTRACE(("TRUNCATE %d %lld %s\n", pFile->h, nByte, rc ? "failed" : "ok")); return rc; @@ -2781,6 +2848,17 @@ static int winFileControl(sqlite3_file *id, int op, void *pArg){ } return SQLITE_OK; } +#if SQLITE_MAX_MMAP_SIZE>0 + case SQLITE_FCNTL_MMAP_SIZE: { + i64 newLimit = *(i64*)pArg; + if( newLimit>sqlite3GlobalConfig.mxMmap ){ + newLimit = sqlite3GlobalConfig.mxMmap; + } + *(i64*)pArg = pFile->mmapSizeMax; + if( newLimit>=0 ) pFile->mmapSizeMax = newLimit; + return SQLITE_OK; + } +#endif } return SQLITE_NOTFOUND; } @@ -3452,6 +3530,192 @@ shmpage_out: #endif /* #ifndef SQLITE_OMIT_WAL */ /* +** Cleans up the mapped region of the specified file, if any. +*/ +#if SQLITE_MAX_MMAP_SIZE>0 +static int winUnmapfile(winFile *pFile){ + assert( pFile!=0 ); + if( pFile->pMapRegion ){ + if( !osUnmapViewOfFile(pFile->pMapRegion) ){ + pFile->lastErrno = osGetLastError(); + return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno, + "winUnmap1", pFile->zPath); + } + pFile->pMapRegion = 0; + pFile->mmapSize = 0; + pFile->mmapSizeActual = 0; + } + if( pFile->hMap!=NULL ){ + if( !osCloseHandle(pFile->hMap) ){ + pFile->lastErrno = osGetLastError(); + return winLogError(SQLITE_IOERR_MMAP, pFile->lastErrno, + "winUnmap2", pFile->zPath); + } + pFile->hMap = NULL; + } + return SQLITE_OK; +} + +/* +** Memory map or remap the file opened by file-descriptor pFd (if the file +** is already mapped, the existing mapping is replaced by the new). Or, if +** there already exists a mapping for this file, and there are still +** outstanding xFetch() references to it, this function is a no-op. +** +** If parameter nByte is non-negative, then it is the requested size of +** the mapping to create. Otherwise, if nByte is less than zero, then the +** requested size is the size of the file on disk. The actual size of the +** created mapping is either the requested size or the value configured +** using SQLITE_FCNTL_MMAP_SIZE, whichever is smaller. +** +** SQLITE_OK is returned if no error occurs (even if the mapping is not +** recreated as a result of outstanding references) or an SQLite error +** code otherwise. +*/ +static int winMapfile(winFile *pFd, sqlite3_int64 nByte){ + sqlite3_int64 nMap = nByte; + int rc; + + assert( nMap>=0 || pFd->nFetchOut==0 ); + if( pFd->nFetchOut>0 ) return SQLITE_OK; + + if( nMap<0 ){ + rc = winFileSize((sqlite3_file*)pFd, &nMap); + if( rc ){ + return SQLITE_IOERR_FSTAT; + } + } + if( nMap>pFd->mmapSizeMax ){ + nMap = pFd->mmapSizeMax; + } + nMap &= ~(sqlite3_int64)(winSysInfo.dwPageSize - 1); + + if( nMap==0 && pFd->mmapSize>0 ){ + winUnmapfile(pFd); + } + if( nMap!=pFd->mmapSize ){ + void *pNew = 0; + DWORD protect = PAGE_READONLY; + DWORD flags = FILE_MAP_READ; + + winUnmapfile(pFd); + if( (pFd->ctrlFlags & WINFILE_RDONLY)==0 ){ + protect = PAGE_READWRITE; + flags |= FILE_MAP_WRITE; + } +#if SQLITE_OS_WINRT + pFd->hMap = osCreateFileMappingFromApp(pFd->h, NULL, protect, nMap, NULL); +#elif defined(SQLITE_WIN32_HAS_WIDE) + pFd->hMap = osCreateFileMappingW(pFd->h, NULL, protect, + (DWORD)((nMap>>32) & 0xffffffff), + (DWORD)(nMap & 0xffffffff), NULL); +#elif defined(SQLITE_WIN32_HAS_ANSI) + pFd->hMap = osCreateFileMappingA(pFd->h, NULL, protect, + (DWORD)((nMap>>32) & 0xffffffff), + (DWORD)(nMap & 0xffffffff), NULL); +#endif + if( pFd->hMap==NULL ){ + pFd->lastErrno = osGetLastError(); + rc = winLogError(SQLITE_IOERR_MMAP, pFd->lastErrno, + "winMapfile", pFd->zPath); + /* Log the error, but continue normal operation using xRead/xWrite */ + return SQLITE_OK; + } + assert( (nMap % winSysInfo.dwPageSize)==0 ); +#if SQLITE_OS_WINRT + pNew = osMapViewOfFileFromApp(pFd->hMap, flags, 0, nMap); +#else + assert( sizeof(SIZE_T)==sizeof(sqlite3_int64) || nMap<=0xffffffff ); + pNew = osMapViewOfFile(pFd->hMap, flags, 0, 0, (SIZE_T)nMap); +#endif + if( pNew==NULL ){ + osCloseHandle(pFd->hMap); + pFd->hMap = NULL; + pFd->lastErrno = osGetLastError(); + winLogError(SQLITE_IOERR_MMAP, pFd->lastErrno, + "winMapfile", pFd->zPath); + return SQLITE_OK; + } + pFd->pMapRegion = pNew; + pFd->mmapSize = nMap; + pFd->mmapSizeActual = nMap; + } + + return SQLITE_OK; +} +#endif /* SQLITE_MAX_MMAP_SIZE>0 */ + +/* +** If possible, return a pointer to a mapping of file fd starting at offset +** iOff. The mapping must be valid for at least nAmt bytes. +** +** If such a pointer can be obtained, store it in *pp and return SQLITE_OK. +** Or, if one cannot but no error occurs, set *pp to 0 and return SQLITE_OK. +** Finally, if an error does occur, return an SQLite error code. The final +** value of *pp is undefined in this case. +** +** If this function does return a pointer, the caller must eventually +** release the reference by calling unixUnfetch(). +*/ +static int winFetch(sqlite3_file *fd, i64 iOff, int nAmt, void **pp){ +#if SQLITE_MAX_MMAP_SIZE>0 + winFile *pFd = (winFile*)fd; /* The underlying database file */ +#endif + *pp = 0; + +#if SQLITE_MAX_MMAP_SIZE>0 + if( pFd->mmapSizeMax>0 ){ + if( pFd->pMapRegion==0 ){ + int rc = winMapfile(pFd, -1); + if( rc!=SQLITE_OK ) return rc; + } + if( pFd->mmapSize >= iOff+nAmt ){ + *pp = &((u8 *)pFd->pMapRegion)[iOff]; + pFd->nFetchOut++; + } + } +#endif + return SQLITE_OK; +} + +/* +** If the third argument is non-NULL, then this function releases a +** reference obtained by an earlier call to unixFetch(). The second +** argument passed to this function must be the same as the corresponding +** argument that was passed to the unixFetch() invocation. +** +** Or, if the third argument is NULL, then this function is being called +** to inform the VFS layer that, according to POSIX, any existing mapping +** may now be invalid and should be unmapped. +*/ +static int winUnfetch(sqlite3_file *fd, i64 iOff, void *p){ +#if SQLITE_MAX_MMAP_SIZE>0 + winFile *pFd = (winFile*)fd; /* The underlying database file */ + + /* If p==0 (unmap the entire file) then there must be no outstanding + ** xFetch references. Or, if p!=0 (meaning it is an xFetch reference), + ** then there must be at least one outstanding. */ + assert( (p==0)==(pFd->nFetchOut==0) ); + + /* If p!=0, it must match the iOff value. */ + assert( p==0 || p==&((u8 *)pFd->pMapRegion)[iOff] ); + + if( p ){ + pFd->nFetchOut--; + }else{ + /* FIXME: If Windows truly always prevents truncating or deleting a + ** file while a mapping is held, then the following winUnmapfile() call + ** is unnecessary can can be omitted - potentially improving + ** performance. */ + winUnmapfile(pFd); + } + + assert( pFd->nFetchOut>=0 ); +#endif + return SQLITE_OK; +} + +/* ** Here ends the implementation of all sqlite3_file methods. ** ********************** End sqlite3_file Methods ******************************* @@ -3462,7 +3726,7 @@ shmpage_out: ** sqlite3_file for win32. */ static const sqlite3_io_methods winIoMethod = { - 2, /* iVersion */ + 3, /* iVersion */ winClose, /* xClose */ winRead, /* xRead */ winWrite, /* xWrite */ @@ -3478,7 +3742,9 @@ static const sqlite3_io_methods winIoMethod = { winShmMap, /* xShmMap */ winShmLock, /* xShmLock */ winShmBarrier, /* xShmBarrier */ - winShmUnmap /* xShmUnmap */ + winShmUnmap, /* xShmUnmap */ + winFetch, /* xFetch */ + winUnfetch /* xUnfetch */ }; /**************************************************************************** @@ -3654,9 +3920,7 @@ static int winOpen( int isExclusive = (flags & SQLITE_OPEN_EXCLUSIVE); int isDelete = (flags & SQLITE_OPEN_DELETEONCLOSE); int isCreate = (flags & SQLITE_OPEN_CREATE); -#ifndef NDEBUG int isReadonly = (flags & SQLITE_OPEN_READONLY); -#endif int isReadWrite = (flags & SQLITE_OPEN_READWRITE); #ifndef NDEBUG @@ -3867,11 +4131,21 @@ static int winOpen( pFile->pMethod = &winIoMethod; pFile->pVfs = pVfs; pFile->h = h; + if( isReadonly ){ + pFile->ctrlFlags |= WINFILE_RDONLY; + } if( sqlite3_uri_boolean(zName, "psow", SQLITE_POWERSAFE_OVERWRITE) ){ pFile->ctrlFlags |= WINFILE_PSOW; } pFile->lastErrno = NO_ERROR; pFile->zPath = zName; +#if SQLITE_MAX_MMAP_SIZE>0 + pFile->hMap = NULL; + pFile->pMapRegion = 0; + pFile->mmapSize = 0; + pFile->mmapSizeActual = 0; + pFile->mmapSizeMax = sqlite3GlobalConfig.mxMmap; +#endif OpenCounter(+1); return rc; @@ -4500,7 +4774,6 @@ int sqlite3_os_init(void){ ** correctly. See ticket [bb3a86e890c8e96ab] */ assert( ArraySize(aSyscall)==74 ); -#ifndef SQLITE_OMIT_WAL /* get memory map allocation granularity */ memset(&winSysInfo, 0, sizeof(SYSTEM_INFO)); #if SQLITE_OS_WINRT @@ -4508,8 +4781,8 @@ int sqlite3_os_init(void){ #else osGetSystemInfo(&winSysInfo); #endif - assert(winSysInfo.dwAllocationGranularity > 0); -#endif + assert( winSysInfo.dwAllocationGranularity>0 ); + assert( winSysInfo.dwPageSize>0 ); sqlite3_vfs_register(&winVfs, 1); return SQLITE_OK; |