Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
Comment: | The pager now handles file ":memory:" complete in memory with no disk I/O. (CVS 1363) |
---|---|
Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
97de9f7ceebab859ef984d155808575a |
User & Date: | drh 2004-05-12 13:30:08.000 |
Context
2004-05-12
| ||
15:15 | Btree uses signed integers for the rowid. The intToKey() and keyToInt() macros are now no-ops. (CVS 1364) (check-in: fb3c803014 user: drh tags: trunk) | |
13:30 | The pager now handles file ":memory:" complete in memory with no disk I/O. (CVS 1363) (check-in: 97de9f7cee user: drh tags: trunk) | |
11:24 | Add some more code to support manifest typing in indices. Not activated yet. (CVS 1362) (check-in: 2f16c9ef3c user: danielk1977 tags: trunk) | |
Changes
Changes to src/pager.c.
︙ | ︙ | |||
14 15 16 17 18 19 20 | ** The pager is used to access a database disk file. It implements ** atomic commit and rollback through the use of a journal file that ** is separate from the database file. The pager also implements file ** locking to prevent two processes from writing the same database ** file simultaneously, or one process from reading the database while ** another is writing. ** | | | 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 | ** The pager is used to access a database disk file. It implements ** atomic commit and rollback through the use of a journal file that ** is separate from the database file. The pager also implements file ** locking to prevent two processes from writing the same database ** file simultaneously, or one process from reading the database while ** another is writing. ** ** @(#) $Id: pager.c,v 1.107 2004/05/12 13:30:08 drh Exp $ */ #include "os.h" /* Must be first to enable large file support */ #include "sqliteInt.h" #include "pager.h" #include <assert.h> #include <string.h> |
︙ | ︙ | |||
99 100 101 102 103 104 105 | ** database file. */ typedef struct PgHdr PgHdr; struct PgHdr { Pager *pPager; /* The pager to which this page belongs */ Pgno pgno; /* The page number for this page */ PgHdr *pNextHash, *pPrevHash; /* Hash collision chain for PgHdr.pgno */ | < | | | > > > > > > > > > > > > > > > > > > > | | | | > | | | > | | | 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 | ** database file. */ typedef struct PgHdr PgHdr; struct PgHdr { Pager *pPager; /* The pager to which this page belongs */ Pgno pgno; /* The page number for this page */ PgHdr *pNextHash, *pPrevHash; /* Hash collision chain for PgHdr.pgno */ PgHdr *pNextFree, *pPrevFree; /* Freelist of pages where nRef==0 */ PgHdr *pNextAll; /* A list of all pages */ PgHdr *pNextStmt, *pPrevStmt; /* List of pages in the statement journal */ u8 inJournal; /* TRUE if has been written to journal */ u8 inStmt; /* TRUE if in the statement subjournal */ u8 dirty; /* TRUE if we need to write back changes */ u8 needSync; /* Sync journal before writing this page */ u8 alwaysRollback; /* Disable dont_rollback() for this page */ short int nRef; /* Number of users of this page */ PgHdr *pDirty; /* Dirty pages sorted by PgHdr.pgno */ /* SQLITE_PAGE_SIZE bytes of page data follow this header */ /* Pager.nExtra bytes of local data follow the page data */ }; /* ** For an in-memory only database, some extra information is recorded about ** each page so that changes can be rolled back. (Journal files are not ** used for in-memory databases.) The following information is added to ** the end of every EXTRA block for in-memory databases. ** ** This information could have been added directly to the PgHdr structure. ** But then it would take up an extra 8 bytes of storage on every PgHdr ** even for disk-based databases. Splitting it out saves 8 bytes. This ** is only a savings of 0.8% but those percentages add up. */ typedef struct PgHistory PgHistory; struct PgHistory { u8 *pOrig; /* Original page text. Restore to this on a full rollback */ u8 *pStmt; /* Text as it was at the beginning of the current statement */ }; /* ** A macro used for invoking the codec if there is one */ #ifdef SQLITE_HAS_CODEC # define CODEC(P,D,N,X) if( P->xCodec ){ P->xCodec(P->pCodecArg,D,N,X); } #else # define CODEC(P,D,N,X) #endif /* ** Convert a pointer to a PgHdr into a pointer to its data ** and back again. */ #define PGHDR_TO_DATA(P) ((void*)(&(P)[1])) #define DATA_TO_PGHDR(D) (&((PgHdr*)(D))[-1]) #define PGHDR_TO_EXTRA(P) ((void*)&((char*)(&(P)[1]))[SQLITE_PAGE_SIZE]) #define PGHDR_TO_HIST(P,PGR) \ ((PgHistory*)&((char*)(&(P)[1]))[(PGR)->pageSize+(PGR)->nExtra]) /* ** How big to make the hash table used for locating in-memory pages ** by page number. */ #define N_PG_HASH 2048 /* ** Hash a page number */ #define pager_hash(PN) ((PN)&(N_PG_HASH-1)) /* ** A open page cache is an instance of the following structure. */ struct Pager { char *zFilename; /* Name of the database file */ char *zJournal; /* Name of the journal file */ char *zDirectory; /* Directory hold database and journal files */ OsFile fd, jfd; /* File descriptors for database and journal */ OsFile stfd; /* File descriptor for the statement subjournal*/ int dbSize; /* Number of pages in the file */ int origDbSize; /* dbSize before the current change */ int stmtSize; /* Size of database (in pages) at stmt_begin() */ off_t stmtJSize; /* Size of journal at stmt_begin() */ int nRec; /* Number of pages written to the journal */ u32 cksumInit; /* Quasi-random value added to every checksum */ int stmtNRec; /* Number of records in stmt subjournal */ int nExtra; /* Add this many bytes to each in-memory page */ void (*xDestructor)(void*); /* Call this routine when freeing pages */ int nPage; /* Total number of in-memory pages */ int nRef; /* Number of in-memory pages with PgHdr.nRef>0 */ int mxPage; /* Maximum number of pages to hold in cache */ int nHit, nMiss, nOvfl; /* Cache hits, missing, and LRU overflows */ void (*xCodec)(void*,void*,Pgno,int); /* Routine for en/decoding data */ void *pCodecArg; /* First argument to xCodec() */ int pageSize; /* Page size in bytes */ u8 journalOpen; /* True if journal file descriptors is valid */ u8 journalStarted; /* True if header of journal is synced */ u8 useJournal; /* Use a rollback journal on this file */ u8 stmtOpen; /* True if the statement subjournal is open */ u8 stmtInUse; /* True we are in a statement subtransaction */ u8 stmtAutoopen; /* Open stmt journal when main journal is opened*/ u8 noSync; /* Do not sync the journal if true */ u8 fullSync; /* Do extra syncs of the journal for robustness */ u8 state; /* SQLITE_UNLOCK, _READLOCK or _WRITELOCK */ u8 errMask; /* One of several kinds of errors */ u8 tempFile; /* zFilename is a temporary file */ u8 readOnly; /* True for a read-only database */ u8 needSync; /* True if an fsync() is needed on the journal */ u8 dirtyFile; /* True if database file has changed in any way */ u8 alwaysRollback; /* Disable dont_rollback() for all pages */ u8 memDb; /* True to inhibit all file I/O */ u8 *aInJournal; /* One bit for each page in the database file */ u8 *aInStmt; /* One bit for each page in the database */ PgHdr *pFirst, *pLast; /* List of free pages */ PgHdr *pFirstSynced; /* First free page with PgHdr.needSync==0 */ PgHdr *pAll; /* List of all pages */ PgHdr *pStmt; /* List of pages in the statement subjournal */ PgHdr *aHash[N_PG_HASH]; /* Hash table to map page number of PgHdr */ }; /* ** These are bits that can be set in Pager.errMask. */ #define PAGER_ERR_FULL 0x01 /* a write() failed */ |
︙ | ︙ | |||
262 263 264 265 266 267 268 | /* ** The following integer determines what format to use when creating ** new primary journal files. By default we always use format 3. ** When testing, we can set this value to older journal formats in order to ** make sure that newer versions of the library are able to rollback older ** journal files. ** | | | 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 | /* ** The following integer determines what format to use when creating ** new primary journal files. By default we always use format 3. ** When testing, we can set this value to older journal formats in order to ** make sure that newer versions of the library are able to rollback older ** journal files. ** ** Note that statement journals always use format 2 and omit the header. */ #ifdef SQLITE_TEST int journal_format = 3; #else # define journal_format 3 #endif |
︙ | ︙ | |||
379 380 381 382 383 384 385 | if( pPager->errMask & PAGER_ERR_MEM ) rc = SQLITE_NOMEM; if( pPager->errMask & PAGER_ERR_CORRUPT ) rc = SQLITE_CORRUPT; return rc; } /* ** Add or remove a page from the list of all pages that are in the | | | | | | | | | | | | | | | | | | | | | | | | | 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 | if( pPager->errMask & PAGER_ERR_MEM ) rc = SQLITE_NOMEM; if( pPager->errMask & PAGER_ERR_CORRUPT ) rc = SQLITE_CORRUPT; return rc; } /* ** Add or remove a page from the list of all pages that are in the ** statement journal. ** ** The Pager keeps a separate list of pages that are currently in ** the statement journal. This helps the sqlite3pager_stmt_commit() ** routine run MUCH faster for the common case where there are many ** pages in memory but only a few are in the statement journal. */ static void page_add_to_stmt_list(PgHdr *pPg){ Pager *pPager = pPg->pPager; if( pPg->inStmt ) return; assert( pPg->pPrevStmt==0 && pPg->pNextStmt==0 ); pPg->pPrevStmt = 0; if( pPager->pStmt ){ pPager->pStmt->pPrevStmt = pPg; } pPg->pNextStmt = pPager->pStmt; pPager->pStmt = pPg; pPg->inStmt = 1; } static void page_remove_from_stmt_list(PgHdr *pPg){ if( !pPg->inStmt ) return; if( pPg->pPrevStmt ){ assert( pPg->pPrevStmt->pNextStmt==pPg ); pPg->pPrevStmt->pNextStmt = pPg->pNextStmt; }else{ assert( pPg->pPager->pStmt==pPg ); pPg->pPager->pStmt = pPg->pNextStmt; } if( pPg->pNextStmt ){ assert( pPg->pNextStmt->pPrevStmt==pPg ); pPg->pNextStmt->pPrevStmt = pPg->pPrevStmt; } pPg->pNextStmt = 0; pPg->pPrevStmt = 0; pPg->inStmt = 0; } /* ** Find a page in the hash table given its page number. Return ** a pointer to the page or NULL if not found. */ static PgHdr *pager_lookup(Pager *pPager, Pgno pgno){ |
︙ | ︙ | |||
471 472 473 474 475 476 477 | ** a file is an expensive operation. */ static int pager_unwritelock(Pager *pPager){ int rc; PgHdr *pPg; if( pPager->state<SQLITE_WRITELOCK ) return SQLITE_OK; sqlite3pager_stmt_commit(pPager); | | | | | 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 | ** a file is an expensive operation. */ static int pager_unwritelock(Pager *pPager){ int rc; PgHdr *pPg; if( pPager->state<SQLITE_WRITELOCK ) return SQLITE_OK; sqlite3pager_stmt_commit(pPager); if( pPager->stmtOpen ){ sqlite3OsClose(&pPager->stfd); pPager->stmtOpen = 0; } if( pPager->journalOpen ){ sqlite3OsClose(&pPager->jfd); pPager->journalOpen = 0; sqlite3OsDelete(pPager->zJournal); sqliteFree( pPager->aInJournal ); pPager->aInJournal = 0; |
︙ | ︙ | |||
757 758 759 760 761 762 763 | }else{ rc = pager_unwritelock(pPager); } return rc; } /* | | | | | | | | | | | | | | | | | 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 | }else{ rc = pager_unwritelock(pPager); } return rc; } /* ** Playback the statement journal. ** ** This is similar to playing back the transaction journal but with ** a few extra twists. ** ** (1) The number of pages in the database file at the start of ** the statement is stored in pPager->stmtSize, not in the ** journal file itself. ** ** (2) In addition to playing back the statement journal, also ** playback all pages of the transaction journal beginning ** at offset pPager->stmtJSize. */ static int pager_stmt_playback(Pager *pPager){ off_t szJ; /* Size of the full journal */ int nRec; /* Number of Records */ int i; /* Loop counter */ int rc; /* Truncate the database back to its original size. */ rc = sqlite3OsTruncate(&pPager->fd, SQLITE_PAGE_SIZE*(off_t)pPager->stmtSize); pPager->dbSize = pPager->stmtSize; /* Figure out how many records are in the statement journal. */ assert( pPager->stmtInUse && pPager->journalOpen ); sqlite3OsSeek(&pPager->stfd, 0); nRec = pPager->stmtNRec; /* Copy original pages out of the statement journal and back into the ** database file. Note that the statement journal always uses format ** 2 instead of format 3 since it does not need to be concerned with ** power failures corrupting the journal and can thus omit the checksums. */ for(i=nRec-1; i>=0; i--){ rc = pager_playback_one_page(pPager, &pPager->stfd, 2); assert( rc!=SQLITE_DONE ); if( rc!=SQLITE_OK ) goto end_stmt_playback; } /* Figure out how many pages need to be copied out of the transaction ** journal. */ rc = sqlite3OsSeek(&pPager->jfd, pPager->stmtJSize); if( rc!=SQLITE_OK ){ goto end_stmt_playback; } rc = sqlite3OsFileSize(&pPager->jfd, &szJ); if( rc!=SQLITE_OK ){ goto end_stmt_playback; } nRec = (szJ - pPager->stmtJSize)/JOURNAL_PG_SZ(journal_format); for(i=nRec-1; i>=0; i--){ rc = pager_playback_one_page(pPager, &pPager->jfd, journal_format); if( rc!=SQLITE_OK ){ assert( rc!=SQLITE_DONE ); goto end_stmt_playback; } } |
︙ | ︙ | |||
924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 | ){ Pager *pPager; char *zFullPathname; int nameLen; OsFile fd; int rc, i; int tempFile; int readOnly = 0; char zTemp[SQLITE_TEMPNAME_SIZE]; *ppPager = 0; if( sqlite3_malloc_failed ){ return SQLITE_NOMEM; } if( zFilename && zFilename[0] ){ | > > > > > > > | | | > | 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 | ){ Pager *pPager; char *zFullPathname; int nameLen; OsFile fd; int rc, i; int tempFile; int memDb = 0; int readOnly = 0; char zTemp[SQLITE_TEMPNAME_SIZE]; *ppPager = 0; if( sqlite3_malloc_failed ){ return SQLITE_NOMEM; } if( zFilename && zFilename[0] ){ if( strcmp(zFilename,":memory:")==0 ){ memDb = 1; zFullPathname = sqliteMalloc(4); if( zFullPathname ) strcpy(zFullPathname, "nil"); rc = SQLITE_OK; }else{ zFullPathname = sqlite3OsFullPathname(zFilename); rc = sqlite3OsOpenReadWrite(zFullPathname, &fd, &readOnly); tempFile = 0; } }else{ rc = sqlite3pager_opentemp(zTemp, &fd); zFilename = zTemp; zFullPathname = sqlite3OsFullPathname(zFilename); tempFile = 1; } if( sqlite3_malloc_failed ){ |
︙ | ︙ | |||
968 969 970 971 972 973 974 | for(i=nameLen; i>0 && pPager->zDirectory[i-1]!='/'; i--){} if( i>0 ) pPager->zDirectory[i-1] = 0; strcpy(pPager->zJournal, zFullPathname); sqliteFree(zFullPathname); strcpy(&pPager->zJournal[nameLen], "-journal"); pPager->fd = fd; pPager->journalOpen = 0; | | | | | > | | > | 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 | for(i=nameLen; i>0 && pPager->zDirectory[i-1]!='/'; i--){} if( i>0 ) pPager->zDirectory[i-1] = 0; strcpy(pPager->zJournal, zFullPathname); sqliteFree(zFullPathname); strcpy(&pPager->zJournal[nameLen], "-journal"); pPager->fd = fd; pPager->journalOpen = 0; pPager->useJournal = useJournal && !memDb; pPager->stmtOpen = 0; pPager->stmtInUse = 0; pPager->nRef = 0; pPager->dbSize = memDb-1; pPager->pageSize = SQLITE_PAGE_SIZE; pPager->stmtSize = 0; pPager->stmtJSize = 0; pPager->nPage = 0; pPager->mxPage = mxPage>5 ? mxPage : 10; pPager->state = SQLITE_UNLOCK; pPager->errMask = 0; pPager->tempFile = tempFile; pPager->memDb = memDb; pPager->readOnly = readOnly; pPager->needSync = 0; pPager->noSync = pPager->tempFile || !useJournal; pPager->pFirst = 0; pPager->pFirstSynced = 0; pPager->pLast = 0; pPager->nExtra = nExtra; |
︙ | ︙ | |||
1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 | } /* ** Forward declaration */ static int syncJournal(Pager*); /* ** Truncate the file to the number of pages specified. */ int sqlite3pager_truncate(Pager *pPager, Pgno nPage){ int rc; if( pPager->dbSize<0 ){ sqlite3pager_pagecount(pPager); } if( pPager->errMask!=0 ){ rc = pager_errcode(pPager); return rc; } if( nPage>=(unsigned)pPager->dbSize ){ return SQLITE_OK; } syncJournal(pPager); rc = sqlite3OsTruncate(&pPager->fd, SQLITE_PAGE_SIZE*(off_t)nPage); if( rc==SQLITE_OK ){ pPager->dbSize = nPage; } return rc; | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 | } /* ** Forward declaration */ static int syncJournal(Pager*); /* ** Unlink a page from the free list (the list of all pages where nRef==0) ** and from its hash collision chain. */ static void unlinkPage(PgHdr *pPg){ Pager *pPager = pPg->pPager; /* Keep the pFirstSynced pointer pointing at the first synchronized page */ if( pPg==pPager->pFirstSynced ){ PgHdr *p = pPg->pNextFree; while( p && p->needSync ){ p = p->pNextFree; } pPager->pFirstSynced = p; } /* Unlink from the freelist */ if( pPg->pPrevFree ){ pPg->pPrevFree->pNextFree = pPg->pNextFree; }else{ assert( pPager->pFirst==pPg ); pPager->pFirst = pPg->pNextFree; } if( pPg->pNextFree ){ pPg->pNextFree->pPrevFree = pPg->pPrevFree; }else{ assert( pPager->pLast==pPg ); pPager->pLast = pPg->pPrevFree; } pPg->pNextFree = pPg->pPrevFree = 0; /* Unlink from the pgno hash table */ if( pPg->pNextHash ){ pPg->pNextHash->pPrevHash = pPg->pPrevHash; } if( pPg->pPrevHash ){ pPg->pPrevHash->pNextHash = pPg->pNextHash; }else{ int h = pager_hash(pPg->pgno); assert( pPager->aHash[h]==pPg ); pPager->aHash[h] = pPg->pNextHash; } pPg->pNextHash = pPg->pPrevHash = 0; } /* ** This routine is used to truncate an in-memory database. Delete ** every pages whose pgno is larger than pPager->dbSize and is unreferenced. ** Referenced pages larger than pPager->dbSize are zeroed. */ static void memoryTruncate(Pager *pPager){ PgHdr *pPg; PgHdr **ppPg; int dbSize = pPager->dbSize; ppPg = &pPager->pAll; while( (pPg = *ppPg)!=0 ){ if( pPg->pgno<=dbSize ){ ppPg = &pPg->pNextAll; }else if( pPg->nRef>0 ){ memset(PGHDR_TO_DATA(pPg), 0, pPager->pageSize); ppPg = &pPg->pNextAll; }else{ *ppPg = pPg->pNextAll; unlinkPage(pPg); sqliteFree(pPg); pPager->nPage--; } } } /* ** Truncate the file to the number of pages specified. */ int sqlite3pager_truncate(Pager *pPager, Pgno nPage){ int rc; if( pPager->dbSize<0 ){ sqlite3pager_pagecount(pPager); } if( pPager->errMask!=0 ){ rc = pager_errcode(pPager); return rc; } if( nPage>=(unsigned)pPager->dbSize ){ return SQLITE_OK; } if( pPager->memDb ){ pPager->dbSize = nPage; memoryTruncate(pPager); return SQLITE_OK; } syncJournal(pPager); rc = sqlite3OsTruncate(&pPager->fd, SQLITE_PAGE_SIZE*(off_t)nPage); if( rc==SQLITE_OK ){ pPager->dbSize = nPage; } return rc; |
︙ | ︙ | |||
1067 1068 1069 1070 1071 1072 1073 | ** result in a coredump. */ int sqlite3pager_close(Pager *pPager){ PgHdr *pPg, *pNext; switch( pPager->state ){ case SQLITE_WRITELOCK: { sqlite3pager_rollback(pPager); | > | > > | > > | > | 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 | ** result in a coredump. */ int sqlite3pager_close(Pager *pPager){ PgHdr *pPg, *pNext; switch( pPager->state ){ case SQLITE_WRITELOCK: { sqlite3pager_rollback(pPager); if( !pPager->memDb ){ sqlite3OsUnlock(&pPager->fd); } assert( pPager->journalOpen==0 ); break; } case SQLITE_READLOCK: { if( !pPager->memDb ){ sqlite3OsUnlock(&pPager->fd); } break; } default: { /* Do nothing */ break; } } for(pPg=pPager->pAll; pPg; pPg=pNext){ pNext = pPg->pNextAll; sqliteFree(pPg); } if( !pPager->memDb ){ sqlite3OsClose(&pPager->fd); } assert( pPager->journalOpen==0 ); /* Temp files are automatically deleted by the OS ** if( pPager->tempFile ){ ** sqlite3OsDelete(pPager->zFilename); ** } */ CLR_PAGER(pPager); |
︙ | ︙ | |||
1337 1338 1339 1340 1341 1342 1343 | if( pPager->errMask & ~(PAGER_ERR_FULL) ){ return pager_errcode(pPager); } /* If this is the first page accessed, then get a read lock ** on the database file. */ | | | 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 | if( pPager->errMask & ~(PAGER_ERR_FULL) ){ return pager_errcode(pPager); } /* If this is the first page accessed, then get a read lock ** on the database file. */ if( pPager->nRef==0 && !pPager->memDb ){ rc = sqlite3OsReadLock(&pPager->fd); if( rc!=SQLITE_OK ){ return rc; } pPager->state = SQLITE_READLOCK; /* If a journal file exists, try to play it back. |
︙ | ︙ | |||
1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 | return rc; } } pPg = 0; }else{ /* Search for page in cache */ pPg = pager_lookup(pPager, pgno); } if( pPg==0 ){ /* The requested page is not in the page cache. */ int h; pPager->nMiss++; | > > > | | > < < | | | > | 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 | return rc; } } pPg = 0; }else{ /* Search for page in cache */ pPg = pager_lookup(pPager, pgno); if( pPager->memDb && pPager->state==SQLITE_UNLOCK ){ pPager->state = SQLITE_READLOCK; } } if( pPg==0 ){ /* The requested page is not in the page cache. */ int h; pPager->nMiss++; if( pPager->nPage<pPager->mxPage || pPager->pFirst==0 || pPager->memDb ){ /* Create a new page */ pPg = sqliteMallocRaw( sizeof(*pPg) + SQLITE_PAGE_SIZE + sizeof(u32) + pPager->nExtra + pPager->memDb*sizeof(PgHistory) ); if( pPg==0 ){ pager_unwritelock(pPager); pPager->errMask |= PAGER_ERR_MEM; return SQLITE_NOMEM; } memset(pPg, 0, sizeof(*pPg)); if( pPager->memDb ){ memset(PGHDR_TO_HIST(pPg, pPager), 0, sizeof(PgHistory)); } pPg->pPager = pPager; pPg->pNextAll = pPager->pAll; pPager->pAll = pPg; pPager->nPage++; }else{ /* Find a page to recycle. Try to locate a page that does not ** require us to do an fsync() on the journal. */ pPg = pPager->pFirstSynced; |
︙ | ︙ | |||
1461 1462 1463 1464 1465 1466 1467 | */ if( pPg->alwaysRollback ){ pPager->alwaysRollback = 1; } /* Unlink the old page from the free list and the hash table */ | < < < | < < < < < < < < < < < < < < < < < < < < < < < < < | | | 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 | */ if( pPg->alwaysRollback ){ pPager->alwaysRollback = 1; } /* Unlink the old page from the free list and the hash table */ unlinkPage(pPg); pPager->nOvfl++; } pPg->pgno = pgno; if( pPager->aInJournal && (int)pgno<=pPager->origDbSize ){ sqlite3CheckMemory(pPager->aInJournal, pgno/8); assert( pPager->journalOpen ); pPg->inJournal = (pPager->aInJournal[pgno/8] & (1<<(pgno&7)))!=0; pPg->needSync = 0; }else{ pPg->inJournal = 0; pPg->needSync = 0; } if( pPager->aInStmt && (int)pgno<=pPager->stmtSize && (pPager->aInStmt[pgno/8] & (1<<(pgno&7)))!=0 ){ page_add_to_stmt_list(pPg); }else{ page_remove_from_stmt_list(pPg); } pPg->dirty = 0; pPg->nRef = 1; REFINFO(pPg); |
︙ | ︙ | |||
1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 | rc = pager_errcode(pPager); return rc; } if( pPager->dbSize<(int)pgno ){ memset(PGHDR_TO_DATA(pPg), 0, SQLITE_PAGE_SIZE); }else{ int rc; sqlite3OsSeek(&pPager->fd, (pgno-1)*(off_t)SQLITE_PAGE_SIZE); rc = sqlite3OsRead(&pPager->fd, PGHDR_TO_DATA(pPg), SQLITE_PAGE_SIZE); TRACE2("FETCH %d\n", pPg->pgno); CODEC(pPager, PGHDR_TO_DATA(pPg), pPg->pgno, 3); if( rc!=SQLITE_OK ){ off_t fileSize; if( sqlite3OsFileSize(&pPager->fd,&fileSize)!=SQLITE_OK | > | 1618 1619 1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 | rc = pager_errcode(pPager); return rc; } if( pPager->dbSize<(int)pgno ){ memset(PGHDR_TO_DATA(pPg), 0, SQLITE_PAGE_SIZE); }else{ int rc; assert( pPager->memDb==0 ); sqlite3OsSeek(&pPager->fd, (pgno-1)*(off_t)SQLITE_PAGE_SIZE); rc = sqlite3OsRead(&pPager->fd, PGHDR_TO_DATA(pPg), SQLITE_PAGE_SIZE); TRACE2("FETCH %d\n", pPg->pgno); CODEC(pPager, PGHDR_TO_DATA(pPg), pPg->pgno, 3); if( rc!=SQLITE_OK ){ off_t fileSize; if( sqlite3OsFileSize(&pPager->fd,&fileSize)!=SQLITE_OK |
︙ | ︙ | |||
1575 1576 1577 1578 1579 1580 1581 | PgHdr *pPg; assert( pPager!=0 ); assert( pgno!=0 ); if( pPager->errMask & ~(PAGER_ERR_FULL) ){ return 0; } | < < < < | 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 | PgHdr *pPg; assert( pPager!=0 ); assert( pgno!=0 ); if( pPager->errMask & ~(PAGER_ERR_FULL) ){ return 0; } pPg = pager_lookup(pPager, pgno); if( pPg==0 ) return 0; page_ref(pPg); return PGHDR_TO_DATA(pPg); } /* |
︙ | ︙ | |||
1629 1630 1631 1632 1633 1634 1635 | } /* When all pages reach the freelist, drop the read lock from ** the database file. */ pPager->nRef--; assert( pPager->nRef>=0 ); | | | 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 | } /* When all pages reach the freelist, drop the read lock from ** the database file. */ pPager->nRef--; assert( pPager->nRef>=0 ); if( pPager->nRef==0 && !pPager->memDb ){ pager_reset(pPager); } } return SQLITE_OK; } /* |
︙ | ︙ | |||
1692 1693 1694 1695 1696 1697 1698 | }else{ assert( journal_format==JOURNAL_FORMAT_1 ); rc = sqlite3OsWrite(&pPager->jfd, aJournalMagic1, sizeof(aJournalMagic1)); } if( rc==SQLITE_OK ){ rc = write32bits(&pPager->jfd, pPager->dbSize); } | | | 1775 1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 | }else{ assert( journal_format==JOURNAL_FORMAT_1 ); rc = sqlite3OsWrite(&pPager->jfd, aJournalMagic1, sizeof(aJournalMagic1)); } if( rc==SQLITE_OK ){ rc = write32bits(&pPager->jfd, pPager->dbSize); } if( pPager->stmtAutoopen && rc==SQLITE_OK ){ rc = sqlite3pager_stmt_begin(pPager); } if( rc!=SQLITE_OK ){ rc = pager_unwritelock(pPager); if( rc==SQLITE_OK ){ rc = SQLITE_FULL; } |
︙ | ︙ | |||
1732 1733 1734 1735 1736 1737 1738 | PgHdr *pPg = DATA_TO_PGHDR(pData); Pager *pPager = pPg->pPager; int rc = SQLITE_OK; assert( pPg->nRef>0 ); assert( pPager->state!=SQLITE_UNLOCK ); if( pPager->state==SQLITE_READLOCK ){ assert( pPager->aInJournal==0 ); | > > > > | | | | | | | | | > | 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 | PgHdr *pPg = DATA_TO_PGHDR(pData); Pager *pPager = pPg->pPager; int rc = SQLITE_OK; assert( pPg->nRef>0 ); assert( pPager->state!=SQLITE_UNLOCK ); if( pPager->state==SQLITE_READLOCK ){ assert( pPager->aInJournal==0 ); if( pPager->memDb ){ pPager->state = SQLITE_WRITELOCK; pPager->origDbSize = pPager->dbSize; }else{ rc = sqlite3OsWriteLock(&pPager->fd); if( rc!=SQLITE_OK ){ return rc; } pPager->state = SQLITE_WRITELOCK; pPager->dirtyFile = 0; TRACE1("TRANSACTION\n"); if( pPager->useJournal && !pPager->tempFile ){ rc = pager_open_journal(pPager); } } } return rc; } /* ** Mark a data page as writeable. The page is written into the journal |
︙ | ︙ | |||
1781 1782 1783 1784 1785 1786 1787 | return SQLITE_PERM; } /* Mark the page as dirty. If the page has already been written ** to the journal then we can return right away. */ pPg->dirty = 1; | | | 1869 1870 1871 1872 1873 1874 1875 1876 1877 1878 1879 1880 1881 1882 1883 | return SQLITE_PERM; } /* Mark the page as dirty. If the page has already been written ** to the journal then we can return right away. */ pPg->dirty = 1; if( pPg->inJournal && (pPg->inStmt || pPager->stmtInUse==0) ){ pPager->dirtyFile = 1; return SQLITE_OK; } /* If we get this far, it means that the page needs to be ** written to the transaction journal or the ckeckpoint journal ** or both. |
︙ | ︙ | |||
1810 1811 1812 1813 1814 1815 1816 | assert( pPager->journalOpen || !pPager->useJournal ); pPager->dirtyFile = 1; /* The transaction journal now exists and we have a write lock on the ** main database file. Write the current page to the transaction ** journal if it is not there already. */ | | > > > > > > > > > > | | | | | | | | | | | | | | | | | | | | | | | | | | | | | > | | | | | > > > > > > > > > | | | | | | | | | | | | | > | 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 | assert( pPager->journalOpen || !pPager->useJournal ); pPager->dirtyFile = 1; /* The transaction journal now exists and we have a write lock on the ** main database file. Write the current page to the transaction ** journal if it is not there already. */ if( !pPg->inJournal && (pPager->useJournal || pPager->memDb) ){ if( (int)pPg->pgno <= pPager->origDbSize ){ int szPg; u32 saved; if( pPager->memDb ){ PgHistory *pHist = PGHDR_TO_HIST(pPg, pPager); TRACE2("JOURNAL %d\n", pPg->pgno); assert( pHist->pOrig==0 ); pHist->pOrig = sqliteMallocRaw( pPager->pageSize ); if( pHist->pOrig ){ memcpy(pHist->pOrig, PGHDR_TO_DATA(pPg), pPager->pageSize); } pPg->inJournal = 1; }else { if( journal_format>=JOURNAL_FORMAT_3 ){ u32 cksum = pager_cksum(pPager, pPg->pgno, pData); saved = *(u32*)PGHDR_TO_EXTRA(pPg); store32bits(cksum, pPg, SQLITE_PAGE_SIZE); szPg = SQLITE_PAGE_SIZE+8; }else{ szPg = SQLITE_PAGE_SIZE+4; } store32bits(pPg->pgno, pPg, -4); CODEC(pPager, pData, pPg->pgno, 7); rc = sqlite3OsWrite(&pPager->jfd, &((char*)pData)[-4], szPg); TRACE3("JOURNAL %d %d\n", pPg->pgno, pPg->needSync); CODEC(pPager, pData, pPg->pgno, 0); if( journal_format>=JOURNAL_FORMAT_3 ){ *(u32*)PGHDR_TO_EXTRA(pPg) = saved; } if( rc!=SQLITE_OK ){ sqlite3pager_rollback(pPager); pPager->errMask |= PAGER_ERR_FULL; return rc; } pPager->nRec++; assert( pPager->aInJournal!=0 ); pPager->aInJournal[pPg->pgno/8] |= 1<<(pPg->pgno&7); pPg->needSync = !pPager->noSync; pPg->inJournal = 1; if( pPager->stmtInUse ){ pPager->aInStmt[pPg->pgno/8] |= 1<<(pPg->pgno&7); page_add_to_stmt_list(pPg); } } }else{ pPg->needSync = !pPager->journalStarted && !pPager->noSync; TRACE3("APPEND %d %d\n", pPg->pgno, pPg->needSync); } if( pPg->needSync ){ pPager->needSync = 1; } } /* If the statement journal is open and the page is not in it, ** then write the current page to the statement journal. Note that ** the statement journal always uses the simplier format 2 that lacks ** checksums. The header is also omitted from the statement journal. */ if( pPager->stmtInUse && !pPg->inStmt && (int)pPg->pgno<=pPager->stmtSize ){ assert( pPg->inJournal || (int)pPg->pgno>pPager->origDbSize ); if( pPager->memDb ){ PgHistory *pHist = PGHDR_TO_HIST(pPg, pPager); assert( pHist->pStmt==0 ); pHist->pStmt = sqliteMallocRaw( pPager->pageSize ); if( pHist->pStmt ){ memcpy(pHist->pStmt, PGHDR_TO_DATA(pPg), pPager->pageSize); } TRACE2("STMT-JOURNAL %d\n", pPg->pgno); }else{ store32bits(pPg->pgno, pPg, -4); CODEC(pPager, pData, pPg->pgno, 7); rc = sqlite3OsWrite(&pPager->stfd, ((char*)pData)-4, SQLITE_PAGE_SIZE+4); TRACE2("STMT-JOURNAL %d\n", pPg->pgno); CODEC(pPager, pData, pPg->pgno, 0); if( rc!=SQLITE_OK ){ sqlite3pager_rollback(pPager); pPager->errMask |= PAGER_ERR_FULL; return rc; } pPager->stmtNRec++; assert( pPager->aInStmt!=0 ); pPager->aInStmt[pPg->pgno/8] |= 1<<(pPg->pgno&7); } page_add_to_stmt_list(pPg); } /* Update the database size and return. */ if( pPager->dbSize<(int)pPg->pgno ){ pPager->dbSize = pPg->pgno; |
︙ | ︙ | |||
1970 1971 1972 1973 1974 1975 1976 | ** rollback journal. */ void sqlite3pager_dont_rollback(void *pData){ PgHdr *pPg = DATA_TO_PGHDR(pData); Pager *pPager = pPg->pPager; if( pPager->state!=SQLITE_WRITELOCK || pPager->journalOpen==0 ) return; | | | | | | | > > > > > > > > > > > | 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 | ** rollback journal. */ void sqlite3pager_dont_rollback(void *pData){ PgHdr *pPg = DATA_TO_PGHDR(pData); Pager *pPager = pPg->pPager; if( pPager->state!=SQLITE_WRITELOCK || pPager->journalOpen==0 ) return; if( pPg->alwaysRollback || pPager->alwaysRollback || pPager->memDb ) return; if( !pPg->inJournal && (int)pPg->pgno <= pPager->origDbSize ){ assert( pPager->aInJournal!=0 ); pPager->aInJournal[pPg->pgno/8] |= 1<<(pPg->pgno&7); pPg->inJournal = 1; if( pPager->stmtInUse ){ pPager->aInStmt[pPg->pgno/8] |= 1<<(pPg->pgno&7); page_add_to_stmt_list(pPg); } TRACE2("DONT_ROLLBACK %d\n", pPg->pgno); } if( pPager->stmtInUse && !pPg->inStmt && (int)pPg->pgno<=pPager->stmtSize ){ assert( pPg->inJournal || (int)pPg->pgno>pPager->origDbSize ); assert( pPager->aInStmt!=0 ); pPager->aInStmt[pPg->pgno/8] |= 1<<(pPg->pgno&7); page_add_to_stmt_list(pPg); } } /* ** Clear a PgHistory block */ static void clearHistory(PgHistory *pHist){ sqliteFree(pHist->pOrig); sqliteFree(pHist->pStmt); pHist->pOrig = 0; pHist->pStmt = 0; } /* ** Commit all changes to the database and release the write lock. ** ** If the commit fails for any reason, a rollback attempt is made ** and an error code is returned. If the commit worked, SQLITE_OK ** is returned. */ |
︙ | ︙ | |||
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 | rc = pager_errcode(pPager); return rc; } if( pPager->state!=SQLITE_WRITELOCK ){ return SQLITE_ERROR; } TRACE1("COMMIT\n"); if( pPager->dirtyFile==0 ){ /* Exit early (without doing the time-consuming sqlite3OsSync() calls) ** if there have been no changes to the database file. */ assert( pPager->needSync==0 ); rc = pager_unwritelock(pPager); pPager->dbSize = -1; return rc; | > > > > > > > > > > > > > > | 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 | rc = pager_errcode(pPager); return rc; } if( pPager->state!=SQLITE_WRITELOCK ){ return SQLITE_ERROR; } TRACE1("COMMIT\n"); if( pPager->memDb ){ pPg = pager_get_all_dirty_pages(pPager); while( pPg ){ clearHistory(PGHDR_TO_HIST(pPg, pPager)); pPg->dirty = 0; pPg->inJournal = 0; pPg->inStmt = 0; pPg->pPrevStmt = pPg->pNextStmt = 0; pPg = pPg->pDirty; } pPager->pStmt = 0; pPager->state = SQLITE_READLOCK; return SQLITE_OK; } if( pPager->dirtyFile==0 ){ /* Exit early (without doing the time-consuming sqlite3OsSync() calls) ** if there have been no changes to the database file. */ assert( pPager->needSync==0 ); rc = pager_unwritelock(pPager); pPager->dbSize = -1; return rc; |
︙ | ︙ | |||
2064 2065 2066 2067 2068 2069 2070 2071 2072 2073 2074 2075 2076 2077 | ** unless a prior malloc() failed (SQLITE_NOMEM). Appropriate error ** codes are returned for all these occasions. Otherwise, ** SQLITE_OK is returned. */ int sqlite3pager_rollback(Pager *pPager){ int rc; TRACE1("ROLLBACK\n"); if( !pPager->dirtyFile || !pPager->journalOpen ){ rc = pager_unwritelock(pPager); pPager->dbSize = -1; return rc; } if( pPager->errMask!=0 && pPager->errMask!=PAGER_ERR_FULL ){ | > > > > > > > > > > > > > > > > > > > > > > > > > > | 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 2236 2237 | ** unless a prior malloc() failed (SQLITE_NOMEM). Appropriate error ** codes are returned for all these occasions. Otherwise, ** SQLITE_OK is returned. */ int sqlite3pager_rollback(Pager *pPager){ int rc; TRACE1("ROLLBACK\n"); if( pPager->memDb ){ PgHdr *p; for(p=pPager->pAll; p; p=p->pNextAll){ PgHistory *pHist; if( !p->dirty ) continue; pHist = PGHDR_TO_HIST(p, pPager); if( pHist->pOrig ){ memcpy(PGHDR_TO_DATA(p), pHist->pOrig, pPager->pageSize); TRACE2("ROLLBACK-PAGE %d\n", p->pgno); }else{ TRACE2("PAGE %d is clean\n", p->pgno); } clearHistory(pHist); p->dirty = 0; p->inJournal = 0; p->inStmt = 0; p->pPrevStmt = p->pNextStmt = 0; } pPager->pStmt = 0; pPager->dbSize = pPager->origDbSize; memoryTruncate(pPager); pPager->stmtInUse = 0; pPager->state = SQLITE_READLOCK; return SQLITE_OK; } if( !pPager->dirtyFile || !pPager->journalOpen ){ rc = pager_unwritelock(pPager); pPager->dbSize = -1; return rc; } if( pPager->errMask!=0 && pPager->errMask!=PAGER_ERR_FULL ){ |
︙ | ︙ | |||
2114 2115 2116 2117 2118 2119 2120 | a[6] = pPager->nHit; a[7] = pPager->nMiss; a[8] = pPager->nOvfl; return a; } /* | | | > > > > > > > | < | | | | | | | | | | | | | | | | | | | > > | | < < | | > | | | | | > > > > | > > > | | | > > | > > > > > > > > > > > > > | > | | 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357 2358 2359 2360 2361 2362 2363 2364 2365 2366 2367 2368 2369 2370 2371 2372 2373 2374 2375 2376 2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388 2389 2390 2391 2392 2393 2394 2395 2396 2397 2398 2399 | a[6] = pPager->nHit; a[7] = pPager->nMiss; a[8] = pPager->nOvfl; return a; } /* ** Set the statement rollback point. ** ** This routine should be called with the transaction journal already ** open. A new statement journal is created that can be used to rollback ** changes of a single SQL command within a larger transaction. */ int sqlite3pager_stmt_begin(Pager *pPager){ int rc; char zTemp[SQLITE_TEMPNAME_SIZE]; assert( !pPager->stmtInUse ); TRACE1("STMT-BEGIN\n"); if( pPager->memDb ){ pPager->stmtInUse = 1; pPager->stmtSize = pPager->dbSize; return SQLITE_OK; } if( !pPager->journalOpen ){ pPager->stmtAutoopen = 1; return SQLITE_OK; } assert( pPager->journalOpen ); pPager->aInStmt = sqliteMalloc( pPager->dbSize/8 + 1 ); if( pPager->aInStmt==0 ){ sqlite3OsReadLock(&pPager->fd); return SQLITE_NOMEM; } #ifndef NDEBUG rc = sqlite3OsFileSize(&pPager->jfd, &pPager->stmtJSize); if( rc ) goto stmt_begin_failed; assert( pPager->stmtJSize == pPager->nRec*JOURNAL_PG_SZ(journal_format)+JOURNAL_HDR_SZ(journal_format) ); #endif pPager->stmtJSize = pPager->nRec*JOURNAL_PG_SZ(journal_format) + JOURNAL_HDR_SZ(journal_format); pPager->stmtSize = pPager->dbSize; if( !pPager->stmtOpen ){ rc = sqlite3pager_opentemp(zTemp, &pPager->stfd); if( rc ) goto stmt_begin_failed; pPager->stmtOpen = 1; pPager->stmtNRec = 0; } pPager->stmtInUse = 1; return SQLITE_OK; stmt_begin_failed: if( pPager->aInStmt ){ sqliteFree(pPager->aInStmt); pPager->aInStmt = 0; } return rc; } /* ** Commit a statement. */ int sqlite3pager_stmt_commit(Pager *pPager){ if( pPager->stmtInUse ){ PgHdr *pPg, *pNext; TRACE1("STMT-COMMIT\n"); if( !pPager->memDb ){ sqlite3OsSeek(&pPager->stfd, 0); /* sqlite3OsTruncate(&pPager->stfd, 0); */ sqliteFree( pPager->aInStmt ); pPager->aInStmt = 0; } for(pPg=pPager->pStmt; pPg; pPg=pNext){ pNext = pPg->pNextStmt; assert( pPg->inStmt ); pPg->inStmt = 0; pPg->pPrevStmt = pPg->pNextStmt = 0; if( pPager->memDb ){ PgHistory *pHist = PGHDR_TO_HIST(pPg, pPager); sqliteFree(pHist->pStmt); pHist->pStmt = 0; } } pPager->stmtNRec = 0; pPager->stmtInUse = 0; pPager->pStmt = 0; } pPager->stmtAutoopen = 0; return SQLITE_OK; } /* ** Rollback a statement. */ int sqlite3pager_stmt_rollback(Pager *pPager){ int rc; if( pPager->stmtInUse ){ TRACE1("STMT-ROLLBACK\n"); if( pPager->memDb ){ PgHdr *pPg; for(pPg=pPager->pStmt; pPg; pPg=pPg->pNextStmt){ PgHistory *pHist = PGHDR_TO_HIST(pPg, pPager); if( pHist->pStmt ){ memcpy(PGHDR_TO_DATA(pPg), pHist->pStmt, pPager->pageSize); sqliteFree(pHist->pStmt); pHist->pStmt = 0; } } pPager->dbSize = pPager->stmtSize; memoryTruncate(pPager); rc = SQLITE_OK; }else{ rc = pager_stmt_playback(pPager); } sqlite3pager_stmt_commit(pPager); }else{ rc = SQLITE_OK; } pPager->stmtAutoopen = 0; return rc; } /* ** Return the full pathname of the database file. */ const char *sqlite3pager_filename(Pager *pPager){ |
︙ | ︙ |
Added test/pager2.test.
> > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 | # 2001 September 15 # # The author disclaims copyright to this source code. In place of # a legal notice, here is a blessing: # # May you do good and not evil. # May you find forgiveness for yourself and forgive others. # May you share freely, never taking more than you give. # #*********************************************************************** # This file implements regression tests for SQLite library. The # focus of this script is page cache subsystem. # # $Id: pager2.test,v 1.1 2004/05/12 13:30:09 drh Exp $ set testdir [file dirname $argv0] source $testdir/tester.tcl if {[info commands pager_open]!=""} { db close # Basic sanity check. Open and close a pager. # do_test pager2-1.0 { set v [catch { set ::p1 [pager_open :memory: 10] } msg] } {0} do_test pager2-1.1 { pager_stats $::p1 } {ref 0 page 0 max 10 size 0 state 0 err 0 hit 0 miss 0 ovfl 0} do_test pager2-1.2 { pager_pagecount $::p1 } {0} do_test pager2-1.3 { pager_stats $::p1 } {ref 0 page 0 max 10 size 0 state 0 err 0 hit 0 miss 0 ovfl 0} do_test pager2-1.4 { pager_close $::p1 } {} # Try to write a few pages. # do_test pager2-2.1 { set v [catch { set ::p1 [pager_open :memory: 10] } msg] } {0} #do_test pager2-2.2 { # set v [catch { # set ::g1 [page_get $::p1 0] # } msg] # lappend v $msg #} {1 SQLITE_ERROR} do_test pager2-2.3.1 { set ::gx [page_lookup $::p1 1] } {} do_test pager2-2.3.2 { pager_stats $::p1 } {ref 0 page 0 max 10 size 0 state 0 err 0 hit 0 miss 0 ovfl 0} do_test pager2-2.3.3 { set v [catch { set ::g1 [page_get $::p1 1] } msg] if {$v} {lappend v $msg} set v } {0} do_test pager2-2.3.3 { pager_stats $::p1 } {ref 1 page 1 max 10 size 0 state 1 err 0 hit 0 miss 1 ovfl 0} do_test pager2-2.3.4 { set ::gx [page_lookup $::p1 1] expr {$::gx!=""} } {1} do_test pager2-2.3.5 { pager_stats $::p1 } {ref 1 page 1 max 10 size 0 state 1 err 0 hit 0 miss 1 ovfl 0} do_test pager2-2.3.6 { expr $::g1==$::gx } {1} do_test pager2-2.3.7 { page_unref $::gx pager_stats $::p1 } {ref 1 page 1 max 10 size 0 state 1 err 0 hit 0 miss 1 ovfl 0} do_test pager2-2.4 { pager_stats $::p1 } {ref 1 page 1 max 10 size 0 state 1 err 0 hit 0 miss 1 ovfl 0} do_test pager2-2.5 { pager_pagecount $::p1 } {0} do_test pager2-2.6 { pager_stats $::p1 } {ref 1 page 1 max 10 size 0 state 1 err 0 hit 0 miss 1 ovfl 0} do_test pager2-2.7 { page_number $::g1 } {1} do_test pager2-2.8 { page_read $::g1 } {} do_test pager2-2.9 { page_unref $::g1 } {} do_test pager2-2.10 { pager_stats $::p1 } {ref 0 page 1 max 10 size 0 state 1 err 0 hit 0 miss 1 ovfl 0} do_test pager2-2.11 { set ::g1 [page_get $::p1 1] expr {$::g1!=0} } {1} do_test pager2-2.12 { page_number $::g1 } {1} do_test pager2-2.13 { pager_stats $::p1 } {ref 1 page 1 max 10 size 0 state 1 err 0 hit 1 miss 1 ovfl 0} do_test pager2-2.14 { set v [catch { page_write $::g1 "Page-One" } msg] lappend v $msg } {0 {}} do_test pager2-2.15 { pager_stats $::p1 } {ref 1 page 1 max 10 size 1 state 2 err 0 hit 1 miss 1 ovfl 0} do_test pager2-2.16 { page_read $::g1 } {Page-One} do_test pager2-2.17 { set v [catch { pager_commit $::p1 } msg] lappend v $msg } {0 {}} do_test pager2-2.20 { pager_stats $::p1 } {ref 1 page 1 max 10 size 1 state 1 err 0 hit 1 miss 1 ovfl 0} do_test pager2-2.19 { pager_pagecount $::p1 } {1} do_test pager2-2.21 { pager_stats $::p1 } {ref 1 page 1 max 10 size 1 state 1 err 0 hit 1 miss 1 ovfl 0} do_test pager2-2.22 { page_unref $::g1 } {} do_test pager2-2.23 { pager_stats $::p1 } {ref 0 page 1 max 10 size 1 state 1 err 0 hit 1 miss 1 ovfl 0} do_test pager2-2.24 { set v [catch { page_get $::p1 1 } ::g1] if {$v} {lappend v $::g1} set v } {0} do_test pager2-2.25 { page_read $::g1 } {Page-One} do_test pager2-2.26 { set v [catch { page_write $::g1 {page-one} } msg] lappend v $msg } {0 {}} do_test pager2-2.27 { page_read $::g1 } {page-one} do_test pager2-2.28 { set v [catch { pager_rollback $::p1 } msg] lappend v $msg } {0 {}} do_test pager2-2.29 { page_unref $::g1 set ::g1 [page_get $::p1 1] page_read $::g1 } {Page-One} #do_test pager2-2.99 { # pager_close $::p1 #} {} #do_test pager2-3.1 { # set v [catch { # set ::p1 [pager_open :memory: 15] # } msg] # if {$v} {lappend v $msg} # set v #} {0} do_test pager2-3.2 { pager_pagecount $::p1 } {1} do_test pager2-3.3 { set v [catch { set ::g(1) [page_get $::p1 1] } msg] if {$v} {lappend v $msg} set v } {0} do_test pager2-3.4 { page_read $::g(1) } {Page-One} do_test pager2-3.5 { for {set i 2} {$i<=20} {incr i} { set gx [page_get $::p1 $i] page_write $gx "Page-$i" page_unref $gx } pager_commit $::p1 } {} for {set i 2} {$i<=20} {incr i} { do_test pager2-3.6.[expr {$i-1}] [subst { set gx \[page_get $::p1 $i\] set v \[page_read \$gx\] page_unref \$gx set v }] "Page-$i" } for {set i 1} {$i<=20} {incr i} { regsub -all CNT { set ::g1 [page_get $::p1 CNT] set ::g2 [page_get $::p1 CNT] set ::vx [page_read $::g2] expr {$::g1==$::g2} } $i body; do_test pager2-3.7.$i.1 $body {1} regsub -all CNT { page_unref $::g2 set vy [page_read $::g1] expr {$vy==$::vx} } $i body; do_test pager2-3.7.$i.2 $body {1} regsub -all CNT { page_unref $::g1 set gx [page_get $::p1 CNT] set vy [page_read $gx] page_unref $gx expr {$vy==$::vx} } $i body; do_test pager2-3.7.$i.3 $body {1} } do_test pager2-3.99 { pager_close $::p1 } {} # tests of the checkpoint mechanism and api # do_test pager2-4.0 { set v [catch { set ::p1 [pager_open :memory: 15] } msg] if {$v} {lappend v $msg} set v } {0} do_test pager2-4.1 { set g1 [page_get $::p1 1] page_write $g1 "Page-1 v0" for {set i 2} {$i<=20} {incr i} { set gx [page_get $::p1 $i] page_write $gx "Page-$i v0" page_unref $gx } pager_commit $::p1 } {} for {set i 1} {$i<=20} {incr i} { do_test pager2-4.2.$i { set gx [page_get $p1 $i] set v [page_read $gx] page_unref $gx set v } "Page-$i v0" } do_test pager2-4.3 { lrange [pager_stats $::p1] 0 1 } {ref 1} do_test pager2-4.4 { lrange [pager_stats $::p1] 8 9 } {state 1} for {set i 1} {$i<20} {incr i} { do_test pager2-4.5.$i.0 { set res {} for {set j 2} {$j<=20} {incr j} { set gx [page_get $p1 $j] set value [page_read $gx] page_unref $gx set shouldbe "Page-$j v[expr {$i-1}]" if {$value!=$shouldbe} { lappend res $value $shouldbe } } set res } {} do_test pager2-4.5.$i.1 { page_write $g1 "Page-1 v$i" lrange [pager_stats $p1] 8 9 } {state 2} do_test pager2-4.5.$i.2 { for {set j 2} {$j<=20} {incr j} { set gx [page_get $p1 $j] page_write $gx "Page-$j v$i" page_unref $gx if {$j==$i} { pager_stmt_begin $p1 } } } {} do_test pager2-4.5.$i.3 { set res {} for {set j 2} {$j<=20} {incr j} { set gx [page_get $p1 $j] set value [page_read $gx] page_unref $gx set shouldbe "Page-$j v$i" if {$value!=$shouldbe} { lappend res $value $shouldbe } } set res } {} do_test pager2-4.5.$i.4 { pager_rollback $p1 set res {} for {set j 2} {$j<=20} {incr j} { set gx [page_get $p1 $j] set value [page_read $gx] page_unref $gx set shouldbe "Page-$j v[expr {$i-1}]" if {$value!=$shouldbe} { lappend res $value $shouldbe } } set res } {} do_test pager2-4.5.$i.5 { page_write $g1 "Page-1 v$i" lrange [pager_stats $p1] 8 9 } {state 2} do_test pager2-4.5.$i.6 { for {set j 2} {$j<=20} {incr j} { set gx [page_get $p1 $j] page_write $gx "Page-$j v$i" page_unref $gx if {$j==$i} { pager_stmt_begin $p1 } } } {} do_test pager2-4.5.$i.7 { pager_stmt_rollback $p1 for {set j 2} {$j<=20} {incr j} { set gx [page_get $p1 $j] set value [page_read $gx] page_unref $gx if {$j<=$i || $i==1} { set shouldbe "Page-$j v$i" } else { set shouldbe "Page-$j v[expr {$i-1}]" } if {$value!=$shouldbe} { lappend res $value $shouldbe } } set res } {} do_test pager2-4.5.$i.8 { for {set j 2} {$j<=20} {incr j} { set gx [page_get $p1 $j] page_write $gx "Page-$j v$i" page_unref $gx if {$j==$i} { pager_stmt_begin $p1 } } } {} do_test pager2-4.5.$i.9 { pager_stmt_commit $p1 for {set j 2} {$j<=20} {incr j} { set gx [page_get $p1 $j] set value [page_read $gx] page_unref $gx set shouldbe "Page-$j v$i" if {$value!=$shouldbe} { lappend res $value $shouldbe } } set res } {} do_test pager2-4.5.$i.10 { pager_commit $p1 lrange [pager_stats $p1] 8 9 } {state 1} } do_test pager2-4.99 { pager_close $::p1 } {} } ;# end if( not mem: and has pager_open command ); finish_test |