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-rw-r--r--db2/log/log_rec.c332
1 files changed, 332 insertions, 0 deletions
diff --git a/db2/log/log_rec.c b/db2/log/log_rec.c
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+/*-
+ * 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);
+}
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