diff options
Diffstat (limited to 'db2/log/log_rec.c')
| -rw-r--r-- | db2/log/log_rec.c | 332 |
1 files changed, 332 insertions, 0 deletions
diff --git a/db2/log/log_rec.c b/db2/log/log_rec.c new file mode 100644 index 0000000000..dbc5960731 --- /dev/null +++ b/db2/log/log_rec.c @@ -0,0 +1,332 @@ +/*- + * See the file LICENSE for redistribution information. + * + * Copyright (c) 1996, 1997 + * Sleepycat Software. All rights reserved. + */ +/* + * Copyright (c) 1995, 1996 + * The President and Fellows of Harvard University. All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. All advertising materials mentioning features or use of this software + * must display the following acknowledgement: + * This product includes software developed by the University of + * California, Berkeley and its contributors. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#include "config.h" + +#ifndef lint +static const char sccsid[] = "@(#)log_rec.c 10.11 (Sleepycat) 8/20/97"; +#endif /* not lint */ + +#ifndef NO_SYSTEM_INCLUDES +#include <sys/types.h> + +#include <errno.h> +#include <fcntl.h> +#include <stddef.h> +#include <stdlib.h> +#include <string.h> +#endif + +#include "db_int.h" +#include "shqueue.h" +#include "log.h" +#include "db_dispatch.h" +#include "common_ext.h" + +static int __log_open_file __P((DB_LOG *, + u_int8_t *, char *, DBTYPE, u_int32_t)); + +/* + * PUBLIC: int __log_register_recover + * PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *)); + */ +int +__log_register_recover(logp, dbtp, lsnp, redo, info) + DB_LOG *logp; + DBT *dbtp; + DB_LSN *lsnp; + int redo; + void *info; +{ + __log_register_args *argp; + int ret; + +#ifdef DEBUG_RECOVER + __log_register_print(logp, dbtp, lsnp, redo, info); +#endif + info = info; /* XXX: Shut the compiler up. */ + lsnp = lsnp; + + F_SET(logp, DB_AM_RECOVER); + + if ((ret = __log_register_read(dbtp->data, &argp)) != 0) + goto out; + + ret = __log_open_file(logp, + argp->uid.data, argp->name.data, argp->ftype, argp->id); + if (ret == ENOENT) { + if (redo == TXN_OPENFILES) + __db_err(logp->dbenv, + "warning: file %s not found", argp->name.data); + ret = 0; + } + +out: F_CLR(logp, DB_AM_RECOVER); + if (argp != NULL) + free(argp); + return (ret); +} + +/* + * PUBLIC: int __log_unregister_recover + * PUBLIC: __P((DB_LOG *, DBT *, DB_LSN *, int, void *)); + */ +int +__log_unregister_recover(logp, dbtp, lsnp, redo, info) + DB_LOG *logp; + DBT *dbtp; + DB_LSN *lsnp; + int redo; + void *info; +{ + __log_unregister_args *argp; + int ret; + +#ifdef DEBUG_RECOVER + __log_unregister_print(logp, dbtp, lsnp, redo, info); +#endif + info = info; /* XXX: Shut the compiler up. */ + lsnp = lsnp; + + if (redo == TXN_OPENFILES || + redo == TXN_BACKWARD_ROLL || redo == TXN_UNDO) + return (0); + + F_SET(logp, DB_AM_RECOVER); + if ((ret = __log_unregister_read(dbtp->data, &argp)) != 0) + goto out; + + LOCK_LOGTHREAD(logp); + if (logp->dbentry[argp->id].dbp == NULL) + ret = EINVAL; + else if (--logp->dbentry[argp->id].refcount == 0) { + ret = logp->dbentry[argp->id].dbp->close( + logp->dbentry[argp->id].dbp, 0); + logp->dbentry[argp->id].dbp = NULL; + } + UNLOCK_LOGTHREAD(logp); + +out: F_CLR(logp, DB_AM_RECOVER); + if (argp != NULL) + free(argp); + return (ret); +} + +/* Hand coded routines. */ + +/* + * Called during log_register recovery. Make sure that we have an + * entry in the dbentry table for this ndx. + * Returns 0 on success, non-zero on error. + */ +static int +__log_open_file(lp, uid, name, ftype, ndx) + DB_LOG *lp; + u_int8_t *uid; + char *name; + DBTYPE ftype; + u_int32_t ndx; +{ + DB *dbp; + int ret; + + LOCK_LOGTHREAD(lp); + if (ndx < lp->dbentry_cnt && + (lp->dbentry[ndx].deleted == 1 || lp->dbentry[ndx].dbp != NULL)) { + lp->dbentry[ndx].refcount++; + + UNLOCK_LOGTHREAD(lp); + return (0); + } + UNLOCK_LOGTHREAD(lp); + + /* Need to open file. */ + dbp = NULL; + if ((ret = db_open(name, ftype, 0, 0, lp->dbenv, NULL, &dbp)) == 0) { + /* + * Verify that we are opening the same file that we were + * referring to when we wrote this log record. + */ + if (memcmp(uid, dbp->lock.fileid, DB_FILE_ID_LEN) != 0) { + (void)dbp->close(dbp, 0); + dbp = NULL; + ret = ENOENT; + } + } + + if (ret == 0 || ret == ENOENT) + (void)__log_add_logid(lp, dbp, ndx); + + return (ret); +} + +/* + * This function returns: + * 0 SUCCESS (the entry was not previously set and is now set or the + * entry was previously set and we just inced the ref count. + * >0 on system error (returns errno value). + * PUBLIC: int __log_add_logid __P((DB_LOG *, DB *, u_int32_t)); + */ +int +__log_add_logid(logp, dbp, ndx) + DB_LOG *logp; + DB *dbp; + u_int32_t ndx; +{ + DB_ENTRY *temp_entryp; + u_int32_t i; + int ret; + + ret = 0; + + LOCK_LOGTHREAD(logp); + /* + * Check if we need to grow the table. + */ + if (logp->dbentry_cnt <= ndx) { + if (logp->dbentry_cnt == 0) { + logp->dbentry = + (DB_ENTRY *)malloc(DB_GROW_SIZE * sizeof(DB_ENTRY)); + if (logp->dbentry == NULL) { + ret = ENOMEM; + goto err; + } + } else { + temp_entryp = (DB_ENTRY *)realloc(logp->dbentry, + (DB_GROW_SIZE + logp->dbentry_cnt) * + sizeof(DB_ENTRY)); + if (temp_entryp == NULL) { + ret = ENOMEM; + goto err; + } + logp->dbentry = temp_entryp; + + } + /* Initialize the new entries. */ + for (i = logp->dbentry_cnt; + i < logp->dbentry_cnt + DB_GROW_SIZE; i++) { + logp->dbentry[i].dbp = NULL; + logp->dbentry[i].deleted = 0; + } + + logp->dbentry_cnt += DB_GROW_SIZE; + } + + if (logp->dbentry[ndx].deleted == 0 && logp->dbentry[ndx].dbp == NULL) { + logp->dbentry[ndx].dbp = dbp; + logp->dbentry[ndx].refcount = 1; + logp->dbentry[ndx].deleted = dbp == NULL; + } else + logp->dbentry[ndx].refcount++; + +err: UNLOCK_LOGTHREAD(logp); + return (ret); +} + + +/* + * __db_fileid_to_db -- + * Return the DB corresponding to the specified fileid. + * + * PUBLIC: int __db_fileid_to_db __P((DB_LOG *, DB **, u_int32_t)); + */ +int +__db_fileid_to_db(logp, dbpp, ndx) + DB_LOG *logp; + DB **dbpp; + u_int32_t ndx; +{ + int ret; + + ret = 0; + LOCK_LOGTHREAD(logp); + + /* + * Return DB_DELETED if the file has been deleted + * (it's not an error). + */ + if (logp->dbentry[ndx].deleted) { + ret = DB_DELETED; + goto err; + } + + /* + * Otherwise return 0, but if we don't have a corresponding DB, + * it's an error. + */ + if ((*dbpp = logp->dbentry[ndx].dbp) == NULL) + ret = ENOENT; + +err: UNLOCK_LOGTHREAD(logp); + return (ret); +} + +/* + * Close files that were opened by the recovery daemon. + * + * PUBLIC: void __log_close_files __P((DB_LOG *)); + */ +void +__log_close_files(logp) + DB_LOG *logp; +{ + u_int32_t i; + + LOCK_LOGTHREAD(logp); + for (i = 0; i < logp->dbentry_cnt; i++) + if (logp->dbentry[i].dbp) + logp->dbentry[i].dbp->close(logp->dbentry[i].dbp, 0); + UNLOCK_LOGTHREAD(logp); +} + +/* + * PUBLIC: void __log_rem_logid __P((DB_LOG *, u_int32_t)); + */ +void +__log_rem_logid(logp, ndx) + DB_LOG *logp; + u_int32_t ndx; +{ + LOCK_LOGTHREAD(logp); + if (--logp->dbentry[ndx].refcount == 0) { + logp->dbentry[ndx].dbp = NULL; + logp->dbentry[ndx].deleted = 0; + } + UNLOCK_LOGTHREAD(logp); +} |