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Overview
Comment: | Improvements to the memdb VFS. |
---|---|
Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | memdb |
Files: | files | file ages | folders |
SHA3-256: |
a14fed69d0d4932fc6c71cf8acc5199c |
User & Date: | drh 2018-03-06 04:01:08.317 |
Context
2018-03-06
| ||
19:14 | Simplifications to the memdb VFS. (check-in: 6c3f723a68 user: drh tags: memdb) | |
04:01 | Improvements to the memdb VFS. (check-in: a14fed69d0 user: drh tags: memdb) | |
02:00 | Merge the walIteratorInit() fix from trunk. (check-in: 6399e101d5 user: drh tags: memdb) | |
Changes
Changes to src/memdb.c.
︙ | ︙ | |||
49 50 51 52 53 54 55 | static int memdbWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst); static int memdbTruncate(sqlite3_file*, sqlite3_int64 size); static int memdbSync(sqlite3_file*, int flags); static int memdbFileSize(sqlite3_file*, sqlite3_int64 *pSize); static int memdbLock(sqlite3_file*, int); static int memdbCheckReservedLock(sqlite3_file*, int *pResOut); static int memdbFileControl(sqlite3_file*, int op, void *pArg); | | | 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 | static int memdbWrite(sqlite3_file*,const void*,int iAmt, sqlite3_int64 iOfst); static int memdbTruncate(sqlite3_file*, sqlite3_int64 size); static int memdbSync(sqlite3_file*, int flags); static int memdbFileSize(sqlite3_file*, sqlite3_int64 *pSize); static int memdbLock(sqlite3_file*, int); static int memdbCheckReservedLock(sqlite3_file*, int *pResOut); static int memdbFileControl(sqlite3_file*, int op, void *pArg); /* static int memdbSectorSize(sqlite3_file*); // not used */ static int memdbDeviceCharacteristics(sqlite3_file*); static int memdbFetch(sqlite3_file*, sqlite3_int64 iOfst, int iAmt, void **pp); static int memdbUnfetch(sqlite3_file*, sqlite3_int64 iOfst, void *p); /* ** Methods for MemVfs */ |
︙ | ︙ | |||
105 106 107 108 109 110 111 | memdbTruncate, /* xTruncate */ memdbSync, /* xSync */ memdbFileSize, /* xFileSize */ memdbLock, /* xLock */ memdbLock, /* xUnlock - same as xLock in this case */ memdbCheckReservedLock, /* xCheckReservedLock */ memdbFileControl, /* xFileControl */ | | | 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 | memdbTruncate, /* xTruncate */ memdbSync, /* xSync */ memdbFileSize, /* xFileSize */ memdbLock, /* xLock */ memdbLock, /* xUnlock - same as xLock in this case */ memdbCheckReservedLock, /* xCheckReservedLock */ memdbFileControl, /* xFileControl */ 0, /* memdbSectorSize,*/ /* xSectorSize */ memdbDeviceCharacteristics, /* xDeviceCharacteristics */ 0, /* xShmMap */ 0, /* xShmLock */ 0, /* xShmBarrier */ 0, /* xShmUnmap */ memdbFetch, /* xFetch */ memdbUnfetch /* xUnfetch */ |
︙ | ︙ | |||
153 154 155 156 157 158 159 | } /* ** Try to enlarge the memory allocation to hold at least sz bytes */ static int memdbEnlarge(MemFile *p, sqlite3_int64 newSz){ unsigned char *pNew; | | | > | > | > > | > | > > | 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 | } /* ** Try to enlarge the memory allocation to hold at least sz bytes */ static int memdbEnlarge(MemFile *p, sqlite3_int64 newSz){ unsigned char *pNew; if( (p->mFlags & SQLITE_DESERIALIZE_RESIZEABLE)==0 || p->nMmap>0 ){ return SQLITE_FULL; } pNew = sqlite3_realloc64(p->aData, newSz); if( pNew==0 ) return SQLITE_NOMEM; p->aData = pNew; p->szMax = newSz; return SQLITE_OK; } /* ** Write data to an memdb-file. */ static int memdbWrite( sqlite3_file *pFile, const void *z, int iAmt, sqlite_int64 iOfst ){ MemFile *p = (MemFile *)pFile; if( iOfst+iAmt>p->sz ){ int rc; if( iOfst+iAmt>p->szMax && (rc = memdbEnlarge(p, (iOfst+iAmt)*2))!=SQLITE_OK ){ return rc; } if( iOfst>p->sz ) memset(p->aData+p->sz, 0, iOfst-p->sz); p->sz = iOfst+iAmt; } memcpy(p->aData+iOfst, z, iAmt); return SQLITE_OK; } /* ** Truncate an memdb-file. */ static int memdbTruncate(sqlite3_file *pFile, sqlite_int64 size){ MemFile *p = (MemFile *)pFile; if( size>p->sz ){ int rc; if( size>p->szMax && (rc = memdbEnlarge(p, size))!=SQLITE_OK ){ return rc; } memset(p->aData+p->sz, 0, size-p->sz); } p->sz = size; return SQLITE_OK; } /* |
︙ | ︙ | |||
242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 | if( op==SQLITE_FCNTL_VFSNAME ){ *(char**)pArg = sqlite3_mprintf("memdb(%p,%lld)", p->aData, p->sz); rc = SQLITE_OK; } return rc; } /* ** Return the sector-size in bytes for an memdb-file. */ static int memdbSectorSize(sqlite3_file *pFile){ return 1024; } /* ** Return the device characteristic flags supported by an memdb-file. */ static int memdbDeviceCharacteristics(sqlite3_file *pFile){ return SQLITE_IOCAP_ATOMIC | SQLITE_IOCAP_POWERSAFE_OVERWRITE | | > > | 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 | if( op==SQLITE_FCNTL_VFSNAME ){ *(char**)pArg = sqlite3_mprintf("memdb(%p,%lld)", p->aData, p->sz); rc = SQLITE_OK; } return rc; } #if 0 /* Not used because of SQLITE_IOCAP_POWERSAFE_OVERWRITE */ /* ** Return the sector-size in bytes for an memdb-file. */ static int memdbSectorSize(sqlite3_file *pFile){ return 1024; } #endif /* ** Return the device characteristic flags supported by an memdb-file. */ static int memdbDeviceCharacteristics(sqlite3_file *pFile){ return SQLITE_IOCAP_ATOMIC | SQLITE_IOCAP_POWERSAFE_OVERWRITE | |
︙ | ︙ | |||
290 291 292 293 294 295 296 297 | sqlite3_vfs *pVfs, const char *zName, sqlite3_file *pFile, int flags, int *pOutFlags ){ MemFile *p = (MemFile*)pFile; memset(p, 0, sizeof(*p)); | > > > < | | 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 | sqlite3_vfs *pVfs, const char *zName, sqlite3_file *pFile, int flags, int *pOutFlags ){ MemFile *p = (MemFile*)pFile; if( (flags & SQLITE_OPEN_MAIN_DB)==0 ){ return ORIGVFS(pVfs)->xOpen(ORIGVFS(pVfs), zName, pFile, flags, pOutFlags); } memset(p, 0, sizeof(*p)); p->mFlags = SQLITE_DESERIALIZE_RESIZEABLE | SQLITE_DESERIALIZE_FREEONCLOSE; if( pOutFlags ) *pOutFlags = flags | SQLITE_OPEN_MEMORY; p->base.pMethods = &memdb_io_methods; return SQLITE_OK; } /* ** Delete the file located at zPath. If the dirSync argument is true, ** ensure the file-system modifications are synced to disk before |
︙ | ︙ | |||
533 534 535 536 537 538 539 | } /* ** This routine is called when the extension is loaded. ** Register the new VFS. */ int sqlite3MemdbInit(void){ | > > | > | | 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 | } /* ** This routine is called when the extension is loaded. ** Register the new VFS. */ int sqlite3MemdbInit(void){ sqlite3_vfs *pLower = sqlite3_vfs_find(0); int sz = pLower->szOsFile; memdb_vfs.pAppData = pLower; if( sz<sizeof(MemFile) ) sz = sizeof(MemFile); memdb_vfs.szOsFile = sz; return sqlite3_vfs_register(&memdb_vfs, 0); } #endif /* SQLITE_ENABLE_MEMDB */ |