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Diffstat (limited to 'db2/btree/bt_stat.c')
-rw-r--r--db2/btree/bt_stat.c257
1 files changed, 257 insertions, 0 deletions
diff --git a/db2/btree/bt_stat.c b/db2/btree/bt_stat.c
new file mode 100644
index 0000000000..ba71ea616d
--- /dev/null
+++ b/db2/btree/bt_stat.c
@@ -0,0 +1,257 @@
+/*-
+ * See the file LICENSE for redistribution information.
+ *
+ * Copyright (c) 1996, 1997
+ *	Sleepycat Software.  All rights reserved.
+ */
+
+#include "config.h"
+
+#ifndef lint
+static const char sccsid[] = "@(#)bt_stat.c	10.11 (Sleepycat) 8/19/97";
+#endif /* not lint */
+
+#ifndef NO_SYSTEM_INCLUDES
+#include <sys/types.h>
+
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#endif
+
+#include "db_int.h"
+#include "db_page.h"
+#include "btree.h"
+
+static void __bam_add_rstat __P((DB_BTREE_LSTAT *, DB_BTREE_STAT *));
+
+/*
+ * __bam_stat --
+ *	Gather/print the btree statistics
+ *
+ * PUBLIC: int __bam_stat __P((DB *, void *, void *(*)(size_t), int));
+ */
+int
+__bam_stat(argdbp, spp, db_malloc, flags)
+	DB *argdbp;
+	void *spp;
+	void *(*db_malloc) __P((size_t));
+	int flags;
+{
+	BTMETA *meta;
+	BTREE *t;
+	DB *dbp;
+	DB_BTREE_STAT *sp;
+	DB_LOCK lock;
+	PAGE *h;
+	db_pgno_t lastpgno, pgno;
+	int ret;
+
+	DEBUG_LWRITE(argdbp, NULL, "bam_stat", NULL, NULL, flags);
+
+	/* Check for invalid flags. */
+	if ((ret = __db_statchk(argdbp, flags)) != 0)
+		return (ret);
+
+	if (spp == NULL)
+		return (0);
+
+	GETHANDLE(argdbp, NULL, &dbp, ret);
+	t = dbp->internal;
+
+	/* Allocate and clear the structure. */
+	if ((sp = db_malloc == NULL ?
+	    (DB_BTREE_STAT *)malloc(sizeof(*sp)) :
+	    (DB_BTREE_STAT *)db_malloc(sizeof(*sp))) == NULL) {
+		ret = ENOMEM;
+		goto err;
+	}
+	memset(sp, 0, sizeof(*sp));
+
+	/* If the app just wants the record count, make it fast. */
+	if (LF_ISSET(DB_RECORDCOUNT)) {
+		pgno = PGNO_ROOT;
+		if ((ret = __bam_lget(dbp, 0, pgno, DB_LOCK_READ, &lock)) != 0)
+			goto err;
+		if ((ret = __bam_pget(dbp, (PAGE **)&h, &pgno, 0)) != 0)
+			goto err;
+
+		sp->bt_nrecs = RE_NREC(h);
+
+		(void)memp_fput(dbp->mpf, h, 0);
+		(void)__BT_LPUT(dbp, lock);
+		goto done;
+	}
+
+	/* Get the meta-data page. */
+	pgno = PGNO_METADATA;
+	if ((ret = __bam_lget(dbp, 0, pgno, DB_LOCK_READ, &lock)) != 0)
+		goto err;
+	if ((ret = __bam_pget(dbp, (PAGE **)&meta, &pgno, 0)) != 0)
+		goto err;
+
+	/* Translate the metadata flags. */
+	if (F_ISSET(meta, BTM_DUP))
+		sp->bt_flags |= DB_DUP;
+	if (F_ISSET(meta, BTM_FIXEDLEN))
+		sp->bt_flags |= DB_FIXEDLEN;
+	if (F_ISSET(meta, BTM_RECNUM))
+		sp->bt_flags |= DB_RECNUM;
+	if (F_ISSET(meta, BTM_RENUMBER))
+		sp->bt_flags |= DB_RENUMBER;
+
+	/*
+	 * Get the maxkey, minkey, re_len and re_pad fields from the
+	 * metadata.
+	 */
+	sp->bt_minkey = meta->minkey;
+	sp->bt_maxkey = meta->maxkey;
+	sp->bt_re_len = meta->re_len;
+	sp->bt_re_pad = meta->re_pad;
+
+	/* Get the page size from the DB. */
+	sp->bt_pagesize = dbp->pgsize;
+
+	/* Initialize counters with the meta-data page information. */
+	__bam_add_rstat(&meta->stat, sp);
+
+	/*
+	 * Add in the local information from this handle.
+	 *
+	 * !!!
+	 * This is a bit odd, but it gets us closer to the truth.
+	 */
+	__bam_add_rstat(&t->lstat, sp);
+
+	/* Walk the free list, counting pages. */
+	for (sp->bt_free = 0, pgno = meta->free; pgno != PGNO_INVALID;) {
+		++sp->bt_free;
+
+		if ((ret = __bam_pget(dbp, &h, &pgno, 0)) != 0) {
+			(void)memp_fput(dbp->mpf, meta, 0);
+			(void)__BT_TLPUT(dbp, lock);
+			goto err;
+		}
+		pgno = h->next_pgno;
+		(void)memp_fput(dbp->mpf, h, 0);
+	}
+
+	/* Discard the meta-data page. */
+	(void)memp_fput(dbp->mpf, meta, 0);
+	(void)__BT_TLPUT(dbp, lock);
+
+	/* Get the root page. */
+	pgno = PGNO_ROOT;
+	if ((ret = __bam_lget(dbp, 0, PGNO_ROOT, DB_LOCK_READ, &lock)) != 0)
+		goto err;
+	if ((ret = __bam_pget(dbp, &h, &pgno, 0)) != 0) {
+		(void)__BT_LPUT(dbp, lock);
+		goto err;
+	}
+
+	/* Get the levels from the root page. */
+	sp->bt_levels = h->level;
+
+	/*
+	 * Determine the last page of the database, then walk it, counting
+	 * things.
+	 */
+	if ((ret = memp_fget(dbp->mpf, &lastpgno, DB_MPOOL_LAST, &h)) != 0)
+		goto err;
+	(void)memp_fput(dbp->mpf, h, 0);
+	for (;;) {
+		switch (TYPE(h)) {
+		case P_INVALID:
+			break;
+		case P_IBTREE:
+		case P_IRECNO:
+			++sp->bt_int_pg;
+			sp->bt_int_pgfree += HOFFSET(h) - LOFFSET(h);
+			break;
+		case P_LBTREE:
+			++sp->bt_leaf_pg;
+			sp->bt_leaf_pgfree += HOFFSET(h) - LOFFSET(h);
+			sp->bt_nrecs += NUM_ENT(h) / P_INDX;
+			break;
+		case P_LRECNO:
+			++sp->bt_leaf_pg;
+			sp->bt_leaf_pgfree += HOFFSET(h) - LOFFSET(h);
+			sp->bt_nrecs += NUM_ENT(h);
+			break;
+		case P_DUPLICATE:
+			++sp->bt_dup_pg;
+			/* XXX MARGO: sp->bt_dup_pgfree; */
+			break;
+		case P_OVERFLOW:
+			++sp->bt_over_pg;
+			/* XXX MARGO: sp->bt_over_pgfree; */
+			break;
+		default:
+			(void)memp_fput(dbp->mpf, h, 0);
+			(void)__BT_LPUT(dbp, lock);
+			return (__db_pgfmt(dbp, pgno));
+		}
+
+		(void)memp_fput(dbp->mpf, h, 0);
+		(void)__BT_LPUT(dbp, lock);
+
+		if (++pgno > lastpgno)
+			break;
+		if (__bam_lget(dbp, 0, pgno, DB_LOCK_READ, &lock))
+			break;
+		if (memp_fget(dbp->mpf, &pgno, 0, &h) != 0) {
+			(void)__BT_LPUT(dbp, lock);
+			break;
+		}
+	}
+
+done:	*(DB_BTREE_STAT **)spp = sp;
+	ret = 0;
+
+err:	PUTHANDLE(dbp);
+	return (ret);
+}
+
+/*
+ * __bam_add_mstat --
+ *	Add the local statistics to the meta-data page statistics.
+ *
+ * PUBLIC: void __bam_add_mstat __P((DB_BTREE_LSTAT *, DB_BTREE_LSTAT *));
+ */
+void
+__bam_add_mstat(from, to)
+	DB_BTREE_LSTAT *from;
+	DB_BTREE_LSTAT *to;
+{
+	to->bt_freed += from->bt_freed;
+	to->bt_pfxsaved += from->bt_pfxsaved;
+	to->bt_split += from->bt_split;
+	to->bt_rootsplit += from->bt_rootsplit;
+	to->bt_fastsplit += from->bt_fastsplit;
+	to->bt_added += from->bt_added;
+	to->bt_deleted += from->bt_deleted;
+	to->bt_get += from->bt_get;
+	to->bt_cache_hit += from->bt_cache_hit;
+	to->bt_cache_miss += from->bt_cache_miss;
+}
+
+/*
+ * __bam_add_rstat --
+ *	Add the local statistics to the returned statistics.
+ */
+static void
+__bam_add_rstat(from, to)
+	DB_BTREE_LSTAT *from;
+	DB_BTREE_STAT *to;
+{
+	to->bt_freed += from->bt_freed;
+	to->bt_pfxsaved += from->bt_pfxsaved;
+	to->bt_split += from->bt_split;
+	to->bt_rootsplit += from->bt_rootsplit;
+	to->bt_fastsplit += from->bt_fastsplit;
+	to->bt_added += from->bt_added;
+	to->bt_deleted += from->bt_deleted;
+	to->bt_get += from->bt_get;
+	to->bt_cache_hit += from->bt_cache_hit;
+	to->bt_cache_miss += from->bt_cache_miss;
+}
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