Update.

	* db2/Makefile (distribute): Remove files which do not exist
	anymore.

1 files changed, 534 insertions, 441 deletions

diff --git a/db2/btree/bt_recno.c b/db2/btree/bt_recno.c
index 38dbbd1c55..c69877ff7f 100644
--- a/db2/btree/bt_recno.c
+++ b/db2/btree/bt_recno.c
@@ -8,7 +8,7 @@
 #include "config.h"
 
 #ifndef lint
-static const char sccsid[] = "@(#)bt_recno.c	10.37 (Sleepycat) 5/23/98";
+static const char sccsid[] = "@(#)bt_recno.c	10.53 (Sleepycat) 12/11/98";
 #endif /* not lint */
 
 #ifndef NO_SYSTEM_INCLUDES
@@ -22,64 +22,89 @@ static const char sccsid[] = "@(#)bt_recno.c	10.37 (Sleepycat) 5/23/98";
 #include "db_int.h"
 #include "db_page.h"
 #include "btree.h"
-
-static int __ram_add __P((DB *, db_recno_t *, DBT *, u_int32_t, u_int32_t));
-static int __ram_c_close __P((DBC *));
-static int __ram_c_del __P((DBC *, u_int32_t));
-static int __ram_c_get __P((DBC *, DBT *, DBT *, u_int32_t));
-static int __ram_c_put __P((DBC *, DBT *, DBT *, u_int32_t));
-static int __ram_fmap __P((DB *, db_recno_t));
-static int __ram_get __P((DB *, DB_TXN *, DBT *, DBT *, u_int32_t));
-static int __ram_iget __P((DB *, DBT *, DBT *));
+#include "db_ext.h"
+#include "shqueue.h"
+#include "db_shash.h"
+#include "lock.h"
+#include "lock_ext.h"
+
+static int __ram_add __P((DBC *, db_recno_t *, DBT *, u_int32_t, u_int32_t));
+static int __ram_delete __P((DB *, DB_TXN *, DBT *, u_int32_t));
+static int __ram_fmap __P((DBC *, db_recno_t));
+static int __ram_i_delete __P((DBC *));
 static int __ram_put __P((DB *, DB_TXN *, DBT *, DBT *, u_int32_t));
 static int __ram_source __P((DB *, RECNO *, const char *));
 static int __ram_sync __P((DB *, u_int32_t));
-static int __ram_update __P((DB *, db_recno_t, int));
-static int __ram_vmap __P((DB *, db_recno_t));
-static int __ram_writeback __P((DB *));
+static int __ram_update __P((DBC *, db_recno_t, int));
+static int __ram_vmap __P((DBC *, db_recno_t));
+static int __ram_writeback __P((DBC *));
 
 /*
- * If we're renumbering records, then we have to detect in the cursor that a
- * record was deleted, and adjust the cursor as necessary.  If not renumbering
- * records, then we can detect this by looking at the actual record, so we
- * ignore the cursor delete flag.
+ * In recno, there are two meanings to the on-page "deleted" flag.  If we're
+ * re-numbering records, it means the record was implicitly created.  We skip
+ * over implicitly created records if doing a cursor "next" or "prev", and
+ * return DB_KEYEMPTY if they're explicitly requested..  If not re-numbering
+ * records, it means that the record was implicitly created, or was deleted.
+ * We skip over implicitly created or deleted records if doing a cursor "next"
+ * or "prev", and return DB_KEYEMPTY if they're explicitly requested.
+ *
+ * If we're re-numbering records, then we have to detect in the cursor that
+ * a record was deleted, and adjust the cursor as necessary on the next get.
+ * If we're not re-numbering records, then we can detect that a record has
+ * been deleted by looking at the actual on-page record, so we completely
+ * ignore the cursor's delete flag.  This is different from the B+tree code.
+ * It also maintains whether the cursor references a deleted record in the
+ * cursor, and it doesn't always check the on-page value.
  */
 #define	CD_SET(dbp, cp) {						\
 	if (F_ISSET(dbp, DB_RE_RENUMBER))				\
-		F_SET(cp, CR_DELETED);					\
+		F_SET(cp, C_DELETED);					\
 }
 #define	CD_CLR(dbp, cp) {						\
 	if (F_ISSET(dbp, DB_RE_RENUMBER))				\
-		F_CLR(cp, CR_DELETED);					\
+		F_CLR(cp, C_DELETED);					\
 }
 #define	CD_ISSET(dbp, cp)						\
-	(F_ISSET(dbp, DB_RE_RENUMBER) && F_ISSET(cp, CR_DELETED))
+	(F_ISSET(dbp, DB_RE_RENUMBER) && F_ISSET(cp, C_DELETED))
 
 /*
  * __ram_open --
  *	Recno open function.
  *
- * PUBLIC: int __ram_open __P((DB *, DBTYPE, DB_INFO *));
+ * PUBLIC: int __ram_open __P((DB *, DB_INFO *));
  */
 int
-__ram_open(dbp, type, dbinfo)
+__ram_open(dbp, dbinfo)
 	DB *dbp;
-	DBTYPE type;
 	DB_INFO *dbinfo;
 {
 	BTREE *t;
+	DBC *dbc;
 	RECNO *rp;
-	int ret;
-
-	COMPQUIET(type, DB_RECNO);
+	int ret, t_ret;
 
-	ret = 0;
+	/* Allocate and initialize the private btree structure. */
+	if ((ret = __os_calloc(1, sizeof(BTREE), &t)) != 0)
+		return (ret);
+	dbp->internal = t;
+	__bam_setovflsize(dbp);
 
-	/* Allocate and initialize the private RECNO structure. */
-	if ((rp = (RECNO *)__db_calloc(1, sizeof(*rp))) == NULL)
-		return (ENOMEM);
+	/* Allocate and initialize the private recno structure. */
+	if ((ret = __os_calloc(1, sizeof(*rp), &rp)) != 0)
+		return (ret);
+	/* Link in the private recno structure. */
+	t->recno = rp;
 
-	if (dbinfo != NULL) {
+	/*
+	 * Intention is to make sure all of the user's selections are okay
+	 * here and then use them without checking.
+	 */
+	if (dbinfo == NULL) {
+		rp->re_delim = '\n';
+		rp->re_pad = ' ';
+		rp->re_fd = -1;
+		F_SET(rp, RECNO_EOF);
+	} else {
 		/*
 		 * If the user specified a source tree, open it and map it in.
 		 *
@@ -111,31 +136,40 @@ __ram_open(dbp, type, dbinfo)
 			}
 		} else
 			rp->re_len = 0;
-	} else {
-		rp->re_delim = '\n';
-		rp->re_pad = ' ';
-		rp->re_fd = -1;
-		F_SET(rp, RECNO_EOF);
 	}
 
-	/* Open the underlying btree. */
-	if ((ret = __bam_open(dbp, DB_RECNO, dbinfo)) != 0)
-		goto err;
-
-	/* Set the routines necessary to make it look like a recno tree. */
-	dbp->cursor = __ram_cursor;
+	/* Initialize the remaining fields/methods of the DB. */
+	dbp->am_close = __ram_close;
 	dbp->del = __ram_delete;
-	dbp->get = __ram_get;
 	dbp->put = __ram_put;
+	dbp->stat = __bam_stat;
 	dbp->sync = __ram_sync;
 
-	/* Link in the private recno structure. */
-	((BTREE *)dbp->internal)->bt_recno = rp;
+	/* Start up the tree. */
+	if ((ret = __bam_read_root(dbp)) != 0)
+		goto err;
+
+	/* Set the overflow page size. */
+	__bam_setovflsize(dbp);
 
 	/* If we're snapshotting an underlying source file, do it now. */
-	if (dbinfo != NULL && F_ISSET(dbinfo, DB_SNAPSHOT))
-		if ((ret = __ram_snapshot(dbp)) != 0 && ret != DB_NOTFOUND)
+	if (dbinfo != NULL && F_ISSET(dbinfo, DB_SNAPSHOT)) {
+		/* Allocate a cursor. */
+		if ((ret = dbp->cursor(dbp, NULL, &dbc, 0)) != 0)
+			goto err;
+
+		/* Do the snapshot. */
+		if ((ret = __ram_update(dbc,
+		    DB_MAX_RECORDS, 0)) != 0 && ret == DB_NOTFOUND)
+			ret = 0;
+
+		/* Discard the cursor. */
+		if ((t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
+			ret = t_ret;
+
+		if (ret != 0)
 			goto err;
+	}
 
 	return (0);
 
@@ -145,143 +179,169 @@ err:	/* If we mmap'd a source file, discard it. */
 
 	/* If we opened a source file, discard it. */
 	if (rp->re_fd != -1)
-		(void)__db_close(rp->re_fd);
+		(void)__os_close(rp->re_fd);
 	if (rp->re_source != NULL)
-		FREES(rp->re_source);
-
-	/* If we allocated room for key/data return, discard it. */
-	t = dbp->internal;
-	if (t != NULL && t->bt_rkey.data != NULL)
-		__db_free(t->bt_rkey.data);
+		__os_freestr(rp->re_source);
 
-	FREE(rp, sizeof(*rp));
+	__os_free(rp, sizeof(*rp));
 
 	return (ret);
 }
 
 /*
- * __ram_cursor --
- *	Recno db->cursor function.
- *
- * PUBLIC: int __ram_cursor __P((DB *, DB_TXN *, DBC **));
+ * __ram_delete --
+ *	Recno db->del function.
  */
-int
-__ram_cursor(dbp, txn, dbcp)
+static int
+__ram_delete(dbp, txn, key, flags)
 	DB *dbp;
 	DB_TXN *txn;
-	DBC **dbcp;
+	DBT *key;
+	u_int32_t flags;
 {
-	RCURSOR *cp;
+	CURSOR *cp;
 	DBC *dbc;
+	db_recno_t recno;
+	int ret, t_ret;
 
-	DEBUG_LWRITE(dbp, txn, "ram_cursor", NULL, NULL, 0);
-
-	if ((dbc = (DBC *)__db_calloc(1, sizeof(DBC))) == NULL)
-		return (ENOMEM);
-	if ((cp = (RCURSOR *)__db_calloc(1, sizeof(RCURSOR))) == NULL) {
-		__db_free(dbc);
-		return (ENOMEM);
-	}
-
-	cp->dbc = dbc;
-	cp->recno = RECNO_OOB;
-
-	dbc->dbp = dbp;
-	dbc->txn = txn;
-	dbc->internal = cp;
-	dbc->c_close = __ram_c_close;
-	dbc->c_del = __ram_c_del;
-	dbc->c_get = __ram_c_get;
-	dbc->c_put = __ram_c_put;
-
-	/*
-	 * All cursors are queued from the master DB structure.  Add the
-	 * cursor to that queue.
-	 */
-	CURSOR_SETUP(dbp);
-	TAILQ_INSERT_HEAD(&dbp->curs_queue, dbc, links);
-	CURSOR_TEARDOWN(dbp);
+	DB_PANIC_CHECK(dbp);
 
-	*dbcp = dbc;
-	return (0);
-}
+	/* Check for invalid flags. */
+	if ((ret = __db_delchk(dbp,
+	    key, flags, F_ISSET(dbp, DB_AM_RDONLY))) != 0)
+		return (ret);
 
-/*
- * __ram_get --
- *	Recno db->get function.
- */
-static int
-__ram_get(argdbp, txn, key, data, flags)
-	DB *argdbp;
-	DB_TXN *txn;
-	DBT *key, *data;
-	u_int32_t flags;
-{
-	DB *dbp;
-	int ret;
+	/* Acquire a cursor. */
+	if ((ret = dbp->cursor(dbp, txn, &dbc, DB_WRITELOCK)) != 0)
+		return (ret);
 
-	DEBUG_LWRITE(argdbp, txn, "ram_get", key, NULL, flags);
+	DEBUG_LWRITE(dbc, txn, "ram_delete", key, NULL, flags);
 
-	/* Check for invalid flags. */
-	if ((ret = __db_getchk(argdbp, key, data, flags)) != 0)
-		return (ret);
+	/* Check the user's record number and fill in as necessary. */
+	if ((ret = __ram_getno(dbc, key, &recno, 0)) != 0)
+		goto err;
 
-	GETHANDLE(argdbp, txn, &dbp, ret);
+	/* Do the delete. */
+	cp = dbc->internal;
+	cp->recno = recno;
+	ret = __ram_i_delete(dbc);
 
-	ret = __ram_iget(dbp, key, data);
+	/* Release the cursor. */
+err:	if ((t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
+		ret = t_ret;
 
-	PUTHANDLE(dbp);
 	return (ret);
 }
 
 /*
- * __ram_iget --
- *	Internal ram get function, called for both standard and cursor
- *	get after the flags have been checked.
+ * __ram_i_delete --
+ *	Internal version of recno delete, called by __ram_delete and
+ *	__ram_c_del.
  */
 static int
-__ram_iget(dbp, key, data)
-	DB *dbp;
-	DBT *key, *data;
+__ram_i_delete(dbc)
+	DBC *dbc;
 {
+	BKEYDATA bk;
 	BTREE *t;
+	CURSOR *cp;
+	DB *dbp;
+	DBT hdr, data;
 	PAGE *h;
 	db_indx_t indx;
-	db_recno_t recno;
 	int exact, ret, stack;
 
-	stack = 0;
+	dbp = dbc->dbp;
+	cp = dbc->internal;
 	t = dbp->internal;
+	stack = 0;
 
-	/* Check the user's record number and fill in as necessary. */
-	if ((ret = __ram_getno(dbp, key, &recno, 0)) != 0)
-		goto done;
+	/*
+	 * If this is CDB and this isn't a write cursor, then it's an error.
+	 * If it is a write cursor, but we don't yet hold the write lock, then
+	 * we need to upgrade to the write lock.
+	 */
+	if (F_ISSET(dbp, DB_AM_CDB)) {
+		/* Make sure it's a valid update cursor. */
+		if (!F_ISSET(dbc, DBC_RMW | DBC_WRITER))
+			return (EINVAL);
+
+		if (F_ISSET(dbc, DBC_RMW) &&
+		    (ret = lock_get(dbp->dbenv->lk_info, dbc->locker,
+		    DB_LOCK_UPGRADE, &dbc->lock_dbt, DB_LOCK_WRITE,
+		    &dbc->mylock)) != 0)
+			return (EAGAIN);
+	}
 
-	/* Search the tree for the record. */
-	if ((ret = __bam_rsearch(dbp, &recno, S_FIND, 1, &exact)) != 0)
-		goto done;
-	if (!exact)
-		return (DB_NOTFOUND);
+	/* Search the tree for the key; delete only deletes exact matches. */
+	if ((ret = __bam_rsearch(dbc, &cp->recno, S_DELETE, 1, &exact)) != 0)
+		goto err;
+	if (!exact) {
+		ret = DB_NOTFOUND;
+		goto err;
+	}
 	stack = 1;
 
-	h = t->bt_csp->page;
-	indx = t->bt_csp->indx;
+	h = cp->csp->page;
+	indx = cp->csp->indx;
 
-	/* If the record has already been deleted, we couldn't have found it. */
+	/*
+	 * If re-numbering records, the on-page deleted flag can only mean
+	 * that this record was implicitly created.  Applications aren't
+	 * permitted to delete records they never created, return an error.
+	 *
+	 * If not re-numbering records, the on-page deleted flag means that
+	 * this record was implicitly created, or, was deleted at some time.
+	 * The former is an error because applications aren't permitted to
+	 * delete records they never created, the latter is an error because
+	 * if the record was "deleted", we could never have found it.
+	 */
 	if (B_DISSET(GET_BKEYDATA(h, indx)->type)) {
 		ret = DB_KEYEMPTY;
-		goto done;
+		goto err;
 	}
 
-	/* Return the data item. */
-	ret = __db_ret(dbp,
-	    h, indx, data, &t->bt_rdata.data, &t->bt_rdata.ulen);
-	++t->lstat.bt_get;
+	if (F_ISSET(dbp, DB_RE_RENUMBER)) {
+		/* Delete the item, adjust the counts, adjust the cursors. */
+		if ((ret = __bam_ditem(dbc, h, indx)) != 0)
+			goto err;
+		__bam_adjust(dbc, -1);
+		__ram_ca(dbp, cp->recno, CA_DELETE);
+
+		/*
+		 * If the page is empty, delete it.   The whole tree is locked
+		 * so there are no preparations to make.
+		 */
+		if (NUM_ENT(h) == 0 && h->pgno != PGNO_ROOT) {
+			stack = 0;
+			ret = __bam_dpages(dbc);
+		}
+	} else {
+		/* Use a delete/put pair to replace the record with a marker. */
+		if ((ret = __bam_ditem(dbc, h, indx)) != 0)
+			goto err;
+
+		B_TSET(bk.type, B_KEYDATA, 1);
+		bk.len = 0;
+		memset(&hdr, 0, sizeof(hdr));
+		hdr.data = &bk;
+		hdr.size = SSZA(BKEYDATA, data);
+		memset(&data, 0, sizeof(data));
+		data.data = (char *)"";
+		data.size = 0;
+		if ((ret = __db_pitem(dbc,
+		    h, indx, BKEYDATA_SIZE(0), &hdr, &data)) != 0)
+			goto err;
+	}
+	F_SET(t->recno, RECNO_MODIFIED);
 
-done:	/* Discard the stack. */
-	if (stack)
-		__bam_stkrel(dbp);
+err:	if (stack)
+		__bam_stkrel(dbc, 0);
 
+	/* If we upgraded the CDB lock upon entry; downgrade it now. */
+	if (F_ISSET(dbp, DB_AM_CDB) && F_ISSET(dbc, DBC_RMW))
+		(void)__lock_downgrade(dbp->dbenv->lk_info, dbc->mylock,
+		    DB_LOCK_IWRITE, 0);
 	return (ret);
 }
 
@@ -290,46 +350,50 @@ done:	/* Discard the stack. */
  *	Recno db->put function.
  */
 static int
-__ram_put(argdbp, txn, key, data, flags)
-	DB *argdbp;
+__ram_put(dbp, txn, key, data, flags)
+	DB *dbp;
 	DB_TXN *txn;
 	DBT *key, *data;
 	u_int32_t flags;
 {
-	BTREE *t;
-	DB *dbp;
+	DBC *dbc;
 	db_recno_t recno;
-	int ret;
+	int ret, t_ret;
 
-	DEBUG_LWRITE(argdbp, txn, "ram_put", key, data, flags);
+	DB_PANIC_CHECK(dbp);
 
 	/* Check for invalid flags. */
-	if ((ret = __db_putchk(argdbp,
-	    key, data, flags, F_ISSET(argdbp, DB_AM_RDONLY), 0)) != 0)
+	if ((ret = __db_putchk(dbp,
+	    key, data, flags, F_ISSET(dbp, DB_AM_RDONLY), 0)) != 0)
+		return (ret);
+
+	/* Allocate a cursor. */
+	if ((ret = dbp->cursor(dbp, txn, &dbc, DB_WRITELOCK)) != 0)
 		return (ret);
 
-	GETHANDLE(argdbp, txn, &dbp, ret);
+	DEBUG_LWRITE(dbc, txn, "ram_put", key, data, flags);
 
 	/*
 	 * If we're appending to the tree, make sure we've read in all of
 	 * the backing source file.  Otherwise, check the user's record
 	 * number and fill in as necessary.
 	 */
-	ret = LF_ISSET(DB_APPEND) ?
-	    __ram_snapshot(dbp) : __ram_getno(dbp, key, &recno, 1);
+	ret = flags == DB_APPEND ?
+	    __ram_update(dbc, DB_MAX_RECORDS, 0) :
+	    __ram_getno(dbc, key, &recno, 1);
 
 	/* Add the record. */
 	if (ret == 0)
-		ret = __ram_add(dbp, &recno, data, flags, 0);
+		ret = __ram_add(dbc, &recno, data, flags, 0);
 
-	/* If we're appending to the tree, we have to return the record. */
-	if (ret == 0 && LF_ISSET(DB_APPEND)) {
-		t = dbp->internal;
-		ret = __db_retcopy(key, &recno, sizeof(recno),
-		    &t->bt_rkey.data, &t->bt_rkey.ulen, dbp->db_malloc);
-	}
+	/* Discard the cursor. */
+	if ((t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
+		ret = t_ret;
+
+	/* Return the record number if we're appending to the tree. */
+	if (ret == 0 && flags == DB_APPEND)
+		*(db_recno_t *)key->data = recno;
 
-	PUTHANDLE(dbp);
 	return (ret);
 }
 
@@ -338,23 +402,35 @@ __ram_put(argdbp, txn, key, data, flags)
  *	Recno db->sync function.
  */
 static int
-__ram_sync(argdbp, flags)
-	DB *argdbp;
+__ram_sync(dbp, flags)
+	DB *dbp;
 	u_int32_t flags;
 {
-	DB *dbp;
-	int ret;
+	DBC *dbc;
+	int ret, t_ret;
 
-	DEBUG_LWRITE(argdbp, NULL, "ram_sync", NULL, NULL, flags);
+	/*
+	 * Sync the underlying btree.
+	 *
+	 * !!!
+	 * We don't need to do a panic check or flags check, the "real"
+	 * sync function does all that for us.
+	 */
+	if ((ret = __db_sync(dbp, flags)) != 0)
+		return (ret);
 
-	/* Sync the underlying btree. */
-	if ((ret = __bam_sync(argdbp, flags)) != 0)
+	/* Allocate a cursor. */
+	if ((ret = dbp->cursor(dbp, NULL, &dbc, 0)) != 0)
 		return (ret);
 
+	DEBUG_LWRITE(dbc, NULL, "ram_sync", NULL, NULL, flags);
+
 	/* Copy back the backing source file. */
-	GETHANDLE(argdbp, NULL, &dbp, ret);
-	ret = __ram_writeback(dbp);
-	PUTHANDLE(dbp);
+	ret = __ram_writeback(dbc);
+
+	/* Discard the cursor. */
+	if ((t_ret = dbc->c_close(dbc)) != 0 && ret == 0)
+		ret = t_ret;
 
 	return (ret);
 }
@@ -366,14 +442,12 @@ __ram_sync(argdbp, flags)
  * PUBLIC: int __ram_close __P((DB *));
  */
 int
-__ram_close(argdbp)
-	DB *argdbp;
+__ram_close(dbp)
+	DB *dbp;
 {
 	RECNO *rp;
 
-	DEBUG_LWRITE(argdbp, NULL, "ram_close", NULL, NULL, 0);
-
-	rp = ((BTREE *)argdbp->internal)->bt_recno;
+	rp = ((BTREE *)dbp->internal)->recno;
 
 	/* Close any underlying mmap region. */
 	if (rp->re_smap != NULL)
@@ -381,136 +455,133 @@ __ram_close(argdbp)
 
 	/* Close any backing source file descriptor. */
 	if (rp->re_fd != -1)
-		(void)__db_close(rp->re_fd);
+		(void)__os_close(rp->re_fd);
 
 	/* Free any backing source file name. */
 	if (rp->re_source != NULL)
-		FREES(rp->re_source);
+		__os_freestr(rp->re_source);
 
 	/* Free allocated memory. */
-	FREE(rp, sizeof(RECNO));
-	((BTREE *)argdbp->internal)->bt_recno = NULL;
+	__os_free(rp, sizeof(RECNO));
+	((BTREE *)dbp->internal)->recno = NULL;
 
 	/* Close the underlying btree. */
-	return (__bam_close(argdbp));
-}
-
-/*
- * __ram_c_close --
- *	Recno cursor->close function.
- */
-static int
-__ram_c_close(dbc)
-	DBC *dbc;
-{
-	DEBUG_LWRITE(dbc->dbp, dbc->txn, "ram_c_close", NULL, NULL, 0);
-
-	return (__ram_c_iclose(dbc->dbp, dbc));
-}
-
-/*
- * __ram_c_iclose --
- *	Close a single cursor -- internal version.
- *
- * PUBLIC: int __ram_c_iclose __P((DB *, DBC *));
- */
-int
-__ram_c_iclose(dbp, dbc)
-	DB *dbp;
-	DBC *dbc;
-{
-	/* Remove the cursor from the queue. */
-	CURSOR_SETUP(dbp);
-	TAILQ_REMOVE(&dbp->curs_queue, dbc, links);
-	CURSOR_TEARDOWN(dbp);
-
-	/* Discard the structures. */
-	FREE(dbc->internal, sizeof(RCURSOR));
-	FREE(dbc, sizeof(DBC));
-
-	return (0);
+	return (__bam_close(dbp));
 }
 
 /*
  * __ram_c_del --
  *	Recno cursor->c_del function.
+ *
+ * PUBLIC: int __ram_c_del __P((DBC *, u_int32_t));
  */
-static int
+int
 __ram_c_del(dbc, flags)
 	DBC *dbc;
 	u_int32_t flags;
 {
-	DBT key;
-	RCURSOR *cp;
+	CURSOR *cp;
+	DB *dbp;
 	int ret;
 
-	DEBUG_LWRITE(dbc->dbp, dbc->txn, "ram_c_del", NULL, NULL, flags);
-
+	dbp = dbc->dbp;
 	cp = dbc->internal;
 
+	DB_PANIC_CHECK(dbp);
+
 	/* Check for invalid flags. */
-	if ((ret = __db_cdelchk(dbc->dbp, flags,
-	    F_ISSET(dbc->dbp, DB_AM_RDONLY), cp->recno != RECNO_OOB)) != 0)
+	if ((ret = __db_cdelchk(dbp, flags,
+	    F_ISSET(dbp, DB_AM_RDONLY), cp->recno != RECNO_OOB)) != 0)
 		return (ret);
 
-	/* If already deleted, return failure. */
-	if (CD_ISSET(dbc->dbp, cp))
-		return (DB_KEYEMPTY);
+	DEBUG_LWRITE(dbc, dbc->txn, "ram_c_del", NULL, NULL, flags);
 
-	/* Build a normal delete request. */
-	memset(&key, 0, sizeof(key));
-	key.data = &cp->recno;
-	key.size = sizeof(db_recno_t);
-	if ((ret = __ram_delete(dbc->dbp, dbc->txn, &key, 0)) == 0)
-		CD_SET(dbc->dbp, cp);
+	/*
+	 * If we are running CDB, this had better be either a write
+	 * cursor or an immediate writer.
+	 */
+	if (F_ISSET(dbp, DB_AM_CDB))
+		if (!F_ISSET(dbc, DBC_RMW | DBC_WRITER))
+			return (EINVAL);
 
-	return (ret);
+	/*
+	 * The semantics of cursors during delete are as follows: if record
+	 * numbers are mutable (DB_RE_RENUMBER is set), deleting a record
+	 * causes the cursor to automatically point to the record immediately
+	 * following.  In this case it is possible to use a single cursor for
+	 * repeated delete operations, without intervening operations.
+	 *
+	 * If record numbers are not mutable, then records are replaced with
+	 * a marker containing a delete flag.  If the record referenced by
+	 * this cursor has already been deleted, we will detect that as part
+	 * of the delete operation, and fail.
+	 */
+	return (__ram_i_delete(dbc));
 }
 
 /*
  * __ram_c_get --
  *	Recno cursor->c_get function.
+ *
+ * PUBLIC: int __ram_c_get __P((DBC *, DBT *, DBT *, u_int32_t));
  */
-static int
+int
 __ram_c_get(dbc, key, data, flags)
 	DBC *dbc;
 	DBT *key, *data;
 	u_int32_t flags;
 {
-	BTREE *t;
+	CURSOR *cp, copy;
 	DB *dbp;
-	RCURSOR *cp, copy;
-	int ret;
-
-	DEBUG_LREAD(dbc->dbp, dbc->txn, "ram_c_get",
-	    flags == DB_SET || flags == DB_SET_RANGE ? key : NULL,
-	    NULL, flags);
+	PAGE *h;
+	db_indx_t indx;
+	int exact, ret, stack, tmp_rmw;
 
-	cp = dbc->internal;
 	dbp = dbc->dbp;
+	cp = dbc->internal;
+
+	DB_PANIC_CHECK(dbp);
 
 	/* Check for invalid flags. */
 	if ((ret = __db_cgetchk(dbc->dbp,
 	    key, data, flags, cp->recno != RECNO_OOB)) != 0)
 		return (ret);
 
-	GETHANDLE(dbc->dbp, dbc->txn, &dbp, ret);
-	t = dbp->internal;
+	/* Clear OR'd in additional bits so we can check for flag equality. */
+	tmp_rmw = 0;
+	if (LF_ISSET(DB_RMW)) {
+		if (!F_ISSET(dbp, DB_AM_CDB)) {
+			tmp_rmw = 1;
+			F_SET(dbc, DBC_RMW);
+		}
+		LF_CLR(DB_RMW);
+	}
+
+	DEBUG_LREAD(dbc, dbc->txn, "ram_c_get",
+	    flags == DB_SET || flags == DB_SET_RANGE ? key : NULL, NULL, flags);
 
 	/* Initialize the cursor for a new retrieval. */
 	copy = *cp;
 
 retry:	/* Update the record number. */
+	stack = 0;
 	switch (flags) {
 	case DB_CURRENT:
-		if (CD_ISSET(dbp, cp)) {
-			PUTHANDLE(dbp);
-			return (DB_KEYEMPTY);
-		}
+		/*
+		 * If record numbers are mutable: if we just deleted a record,
+		 * there is no action necessary, we return the record following
+		 * the deleted item by virtue of renumbering the tree.
+		 */
 		break;
 	case DB_NEXT:
+		/*
+		 * If record numbers are mutable: if we just deleted a record,
+		 * we have to avoid incrementing the record number so that we
+		 * return the right record by virtue of renumbering the tree.
+		 */
 		if (CD_ISSET(dbp, cp))
 			break;
+
 		if (cp->recno != RECNO_OOB) {
 			++cp->recno;
 			break;
@@ -522,86 +593,133 @@ retry:	/* Update the record number. */
 		break;
 	case DB_PREV:
 		if (cp->recno != RECNO_OOB) {
-			if (cp->recno == 1)
-				return (DB_NOTFOUND);
+			if (cp->recno == 1) {
+				ret = DB_NOTFOUND;
+				goto err;
+			}
 			--cp->recno;
 			break;
 		}
 		/* FALLTHROUGH */
 	case DB_LAST:
 		flags = DB_PREV;
-		if (((ret = __ram_snapshot(dbp)) != 0) && ret != DB_NOTFOUND)
+		if (((ret = __ram_update(dbc,
+		    DB_MAX_RECORDS, 0)) != 0) && ret != DB_NOTFOUND)
 			goto err;
-		if ((ret = __bam_nrecs(dbp, &cp->recno)) != 0)
+		if ((ret = __bam_nrecs(dbc, &cp->recno)) != 0)
 			goto err;
-		if (cp->recno == 0)
-			return (DB_NOTFOUND);
+		if (cp->recno == 0) {
+			ret = DB_NOTFOUND;
+			goto err;
+		}
 		break;
 	case DB_SET:
 	case DB_SET_RANGE:
-		if ((ret = __ram_getno(dbp, key, &cp->recno, 0)) != 0)
+		if ((ret = __ram_getno(dbc, key, &cp->recno, 0)) != 0)
 			goto err;
 		break;
 	}
 
-	/*
-	 * Return the key if the user didn't give us one, and then pass it
-	 * into __ram_iget().
-	 */
+	/* Return the key if the user didn't give us one. */
 	if (flags != DB_SET && flags != DB_SET_RANGE &&
 	    (ret = __db_retcopy(key, &cp->recno, sizeof(cp->recno),
-	    &t->bt_rkey.data, &t->bt_rkey.ulen, dbp->db_malloc)) != 0)
-		return (ret);
+	    &dbc->rkey.data, &dbc->rkey.ulen, dbp->db_malloc)) != 0)
+		goto err;
 
-	/*
-	 * The cursor was reset, so the delete adjustment is no
-	 * longer necessary.
-	 */
-	CD_CLR(dbp, cp);
+	/* Search the tree for the record. */
+	if ((ret = __bam_rsearch(dbc, &cp->recno,
+	    F_ISSET(dbc, DBC_RMW) ? S_FIND_WR : S_FIND, 1, &exact)) != 0)
+		goto err;
+	stack = 1;
+	if (!exact) {
+		ret = DB_NOTFOUND;
+		goto err;
+	}
+	h = cp->csp->page;
+	indx = cp->csp->indx;
 
 	/*
-	 * Retrieve the record.
-	 *
-	 * Skip any keys that don't really exist.
+	 * If re-numbering records, the on-page deleted flag means this record
+	 * was implicitly created.  If not re-numbering records, the on-page
+	 * deleted flag means this record was implicitly created, or, it was
+	 * deleted at some time.  Regardless, we skip such records if doing
+	 * cursor next/prev operations, and fail if the application requested
+	 * them explicitly.
 	 */
-	if ((ret = __ram_iget(dbp, key, data)) != 0)
-		if (ret == DB_KEYEMPTY &&
-		    (flags == DB_NEXT || flags == DB_PREV))
+	if (B_DISSET(GET_BKEYDATA(h, indx)->type)) {
+		if (flags == DB_NEXT || flags == DB_PREV) {
+			(void)__bam_stkrel(dbc, 0);
 			goto retry;
+		}
+		ret = DB_KEYEMPTY;
+		goto err;
+	}
+
+	/* Return the data item. */
+	if ((ret = __db_ret(dbp,
+	    h, indx, data, &dbc->rdata.data, &dbc->rdata.ulen)) != 0)
+		goto err;
+
+	/* The cursor was reset, no further delete adjustment is necessary. */
+	CD_CLR(dbp, cp);
+
+err:	if (stack)
+		(void)__bam_stkrel(dbc, 0);
+
+	/* Release temporary lock upgrade. */
+	if (tmp_rmw)
+		F_CLR(dbc, DBC_RMW);
 
-err:	if (ret != 0)
+	if (ret != 0)
 		*cp = copy;
 
-	PUTHANDLE(dbp);
 	return (ret);
 }
 
 /*
  * __ram_c_put --
  *	Recno cursor->c_put function.
+ *
+ * PUBLIC: int __ram_c_put __P((DBC *, DBT *, DBT *, u_int32_t));
  */
-static int
+int
 __ram_c_put(dbc, key, data, flags)
 	DBC *dbc;
 	DBT *key, *data;
 	u_int32_t flags;
 {
-	BTREE *t;
-	RCURSOR *cp, copy;
+	CURSOR *cp, copy;
 	DB *dbp;
 	int exact, ret;
 	void *arg;
 
-	DEBUG_LWRITE(dbc->dbp, dbc->txn, "ram_c_put", NULL, data, flags);
-
+	dbp = dbc->dbp;
 	cp = dbc->internal;
 
+	DB_PANIC_CHECK(dbp);
+
 	if ((ret = __db_cputchk(dbc->dbp, key, data, flags,
 	    F_ISSET(dbc->dbp, DB_AM_RDONLY), cp->recno != RECNO_OOB)) != 0)
 		return (ret);
 
-	GETHANDLE(dbc->dbp, dbc->txn, &dbp, ret);
-	t = dbp->internal;
+	DEBUG_LWRITE(dbc, dbc->txn, "ram_c_put", NULL, data, flags);
+
+	/*
+	 * If we are running CDB, this had better be either a write
+	 * cursor or an immediate writer.  If it's a regular writer,
+	 * that means we have an IWRITE lock and we need to upgrade
+	 * it to a write lock.
+	 */
+	if (F_ISSET(dbp, DB_AM_CDB)) {
+		if (!F_ISSET(dbc, DBC_RMW | DBC_WRITER))
+			return (EINVAL);
+
+		if (F_ISSET(dbc, DBC_RMW) &&
+		    (ret = lock_get(dbp->dbenv->lk_info, dbc->locker,
+		    DB_LOCK_UPGRADE, &dbc->lock_dbt, DB_LOCK_WRITE,
+		    &dbc->mylock)) != 0)
+			return (EAGAIN);
+	}
 
 	/* Initialize the cursor for a new retrieval. */
 	copy = *cp;
@@ -614,23 +732,23 @@ __ram_c_put(dbc, key, data, flags)
 	 */
 	if (0) {
 split:		arg = &cp->recno;
-		if ((ret = __bam_split(dbp, arg)) != 0)
+		if ((ret = __bam_split(dbc, arg)) != 0)
 			goto err;
 	}
 
-	if ((ret = __bam_rsearch(dbp, &cp->recno, S_INSERT, 1, &exact)) != 0)
+	if ((ret = __bam_rsearch(dbc, &cp->recno, S_INSERT, 1, &exact)) != 0)
 		goto err;
 	if (!exact) {
 		ret = DB_NOTFOUND;
 		goto err;
 	}
-	if ((ret = __bam_iitem(dbp, &t->bt_csp->page,
-	    &t->bt_csp->indx, key, data, flags, 0)) == DB_NEEDSPLIT) {
-		if ((ret = __bam_stkrel(dbp)) != 0)
+	if ((ret = __bam_iitem(dbc, &cp->csp->page,
+	    &cp->csp->indx, key, data, flags, 0)) == DB_NEEDSPLIT) {
+		if ((ret = __bam_stkrel(dbc, 0)) != 0)
 			goto err;
 		goto split;
 	}
-	if ((ret = __bam_stkrel(dbp)) != 0)
+	if ((ret = __bam_stkrel(dbc, 0)) != 0)
 		goto err;
 
 	switch (flags) {
@@ -650,16 +768,16 @@ split:		arg = &cp->recno;
 		break;
 	}
 
-	/*
-	 * The cursor was reset, so the delete adjustment is no
-	 * longer necessary.
-	 */
+	/* The cursor was reset, no further delete adjustment is necessary. */
 	CD_CLR(dbp, cp);
 
-err:	if (ret != 0)
+err:	if (F_ISSET(dbp, DB_AM_CDB) && F_ISSET(dbc, DBC_RMW))
+		(void)__lock_downgrade(dbp->dbenv->lk_info, dbc->mylock,
+		    DB_LOCK_IWRITE, 0);
+
+	if (ret != 0)
 		*cp = copy;
 
-	PUTHANDLE(dbp);
 	return (ret);
 }
 
@@ -675,20 +793,22 @@ __ram_ca(dbp, recno, op)
 	db_recno_t recno;
 	ca_recno_arg op;
 {
+	CURSOR *cp;
 	DBC *dbc;
-	RCURSOR *cp;
 
 	/*
 	 * Adjust the cursors.  See the comment in __bam_ca_delete().
 	 */
-	CURSOR_SETUP(dbp);
-	for (dbc = TAILQ_FIRST(&dbp->curs_queue);
+	DB_THREAD_LOCK(dbp);
+	for (dbc = TAILQ_FIRST(&dbp->active_queue);
 	    dbc != NULL; dbc = TAILQ_NEXT(dbc, links)) {
-		cp = (RCURSOR *)dbc->internal;
+		cp = dbc->internal;
 		switch (op) {
 		case CA_DELETE:
 			if (recno > cp->recno)
 				--cp->recno;
+			if (recno == cp->recno)
+				CD_SET(dbp, cp);
 			break;
 		case CA_IAFTER:
 			if (recno > cp->recno)
@@ -700,51 +820,27 @@ __ram_ca(dbp, recno, op)
 			break;
 		}
 	}
-	CURSOR_TEARDOWN(dbp);
+	DB_THREAD_UNLOCK(dbp);
 }
 
-#ifdef DEBUG
-/*
- * __ram_cprint --
- *	Display the current recno cursor list.
- *
- * PUBLIC: int __ram_cprint __P((DB *));
- */
-int
-__ram_cprint(dbp)
-	DB *dbp;
-{
-	DBC *dbc;
-	RCURSOR *cp;
-
-	CURSOR_SETUP(dbp);
-	for (dbc = TAILQ_FIRST(&dbp->curs_queue);
-	    dbc != NULL; dbc = TAILQ_NEXT(dbc, links)) {
-		cp = (RCURSOR *)dbc->internal;
-		fprintf(stderr,
-		    "%#0x: recno: %lu\n", (u_int)cp, (u_long)cp->recno);
-	}
-	CURSOR_TEARDOWN(dbp);
-
-	return (0);
-}
-#endif /* DEBUG */
-
 /*
  * __ram_getno --
  *	Check the user's record number, and make sure we've seen it.
  *
- * PUBLIC: int __ram_getno __P((DB *, const DBT *, db_recno_t *, int));
+ * PUBLIC: int __ram_getno __P((DBC *, const DBT *, db_recno_t *, int));
  */
 int
-__ram_getno(dbp, key, rep, can_create)
-	DB *dbp;
+__ram_getno(dbc, key, rep, can_create)
+	DBC *dbc;
 	const DBT *key;
 	db_recno_t *rep;
 	int can_create;
 {
+	DB *dbp;
 	db_recno_t recno;
 
+	dbp = dbc->dbp;
+
 	/* Check the user's record number. */
 	if ((recno = *(db_recno_t *)key->data) == 0) {
 		__db_err(dbp->dbenv, "illegal record number of 0");
@@ -754,24 +850,11 @@ __ram_getno(dbp, key, rep, can_create)
 		*rep = recno;
 
 	/*
-	 * Btree can neither create records or read them in.  Recno can
+	 * Btree can neither create records nor read them in.  Recno can
 	 * do both, see if we can find the record.
 	 */
 	return (dbp->type == DB_RECNO ?
-	    __ram_update(dbp, recno, can_create) : 0);
-}
-
-/*
- * __ram_snapshot --
- *	Read in any remaining records from the backing input file.
- *
- * PUBLIC: int __ram_snapshot __P((DB *));
- */
-int
-__ram_snapshot(dbp)
-	DB *dbp;
-{
-	return (__ram_update(dbp, DB_MAX_RECORDS, 0));
+	    __ram_update(dbc, recno, can_create) : 0);
 }
 
 /*
@@ -779,18 +862,20 @@ __ram_snapshot(dbp)
  *	Ensure the tree has records up to and including the specified one.
  */
 static int
-__ram_update(dbp, recno, can_create)
-	DB *dbp;
+__ram_update(dbc, recno, can_create)
+	DBC *dbc;
 	db_recno_t recno;
 	int can_create;
 {
 	BTREE *t;
+	DB *dbp;
 	RECNO *rp;
 	db_recno_t nrecs;
 	int ret;
 
+	dbp = dbc->dbp;
 	t = dbp->internal;
-	rp = t->bt_recno;
+	rp = t->recno;
 
 	/*
 	 * If we can't create records and we've read the entire backing input
@@ -803,12 +888,12 @@ __ram_update(dbp, recno, can_create)
 	 * If we haven't seen this record yet, try to get it from the original
 	 * file.
 	 */
-	if ((ret = __bam_nrecs(dbp, &nrecs)) != 0)
+	if ((ret = __bam_nrecs(dbc, &nrecs)) != 0)
 		return (ret);
 	if (!F_ISSET(rp, RECNO_EOF) && recno > nrecs) {
-		if ((ret = rp->re_irec(dbp, recno)) != 0)
+		if ((ret = rp->re_irec(dbc, recno)) != 0)
 			return (ret);
-		if ((ret = __bam_nrecs(dbp, &nrecs)) != 0)
+		if ((ret = __bam_nrecs(dbc, &nrecs)) != 0)
 			return (ret);
 	}
 
@@ -819,28 +904,27 @@ __ram_update(dbp, recno, can_create)
 	if (!can_create || recno <= nrecs + 1)
 		return (0);
 
-	t->bt_rdata.dlen = 0;
-	t->bt_rdata.doff = 0;
-	t->bt_rdata.flags = 0;
+	dbc->rdata.dlen = 0;
+	dbc->rdata.doff = 0;
+	dbc->rdata.flags = 0;
 	if (F_ISSET(dbp, DB_RE_FIXEDLEN)) {
-		if (t->bt_rdata.ulen < rp->re_len) {
-			t->bt_rdata.data = t->bt_rdata.data == NULL ?
-			    (void *)__db_malloc(rp->re_len) :
-			    (void *)__db_realloc(t->bt_rdata.data, rp->re_len);
-			if (t->bt_rdata.data == NULL) {
-				t->bt_rdata.ulen = 0;
-				return (ENOMEM);
+		if (dbc->rdata.ulen < rp->re_len) {
+			if ((ret =
+			    __os_realloc(&dbc->rdata.data, rp->re_len)) != 0) {
+				dbc->rdata.ulen = 0;
+				dbc->rdata.data = NULL;
+				return (ret);
 			}
-			t->bt_rdata.ulen = rp->re_len;
+			dbc->rdata.ulen = rp->re_len;
 		}
-		t->bt_rdata.size = rp->re_len;
-		memset(t->bt_rdata.data, rp->re_pad, rp->re_len);
+		dbc->rdata.size = rp->re_len;
+		memset(dbc->rdata.data, rp->re_pad, rp->re_len);
 	} else
-		t->bt_rdata.size = 0;
+		dbc->rdata.size = 0;
 
 	while (recno > ++nrecs)
-		if ((ret = __ram_add(dbp,
-		    &nrecs, &t->bt_rdata, 0, BI_DELETED)) != 0)
+		if ((ret = __ram_add(dbc,
+		    &nrecs, &dbc->rdata, 0, BI_DELETED)) != 0)
 			return (ret);
 	return (0);
 }
@@ -859,6 +943,11 @@ __ram_source(dbp, rp, fname)
 	u_int32_t bytes, mbytes, oflags;
 	int ret;
 
+	/*
+	 * !!!
+	 * The caller has full responsibility for cleaning up on error --
+	 * (it has to anyway, in case it fails after this routine succeeds).
+	 */
 	if ((ret = __db_appname(dbp->dbenv,
 	    DB_APP_DATA, NULL, fname, 0, NULL, &rp->re_source)) != 0)
 		return (ret);
@@ -867,7 +956,7 @@ __ram_source(dbp, rp, fname)
 	if ((ret =
 	    __db_open(rp->re_source, oflags, oflags, 0, &rp->re_fd)) != 0) {
 		__db_err(dbp->dbenv, "%s: %s", rp->re_source, strerror(ret));
-		goto err;
+		return (ret);
 	}
 
 	/*
@@ -878,10 +967,10 @@ __ram_source(dbp, rp, fname)
 	 * compiler will perpetrate, doing the comparison in a portable way is
 	 * flatly impossible.  Hope that mmap fails if the file is too large.
 	 */
-	if ((ret = __db_ioinfo(rp->re_source,
+	if ((ret = __os_ioinfo(rp->re_source,
 	    rp->re_fd, &mbytes, &bytes, NULL)) != 0) {
 		__db_err(dbp->dbenv, "%s: %s", rp->re_source, strerror(ret));
-		goto err;
+		return (ret);
 	}
 	if (mbytes == 0 && bytes == 0) {
 		F_SET(rp, RECNO_EOF);
@@ -891,14 +980,11 @@ __ram_source(dbp, rp, fname)
 	size = mbytes * MEGABYTE + bytes;
 	if ((ret = __db_mapfile(rp->re_source,
 	    rp->re_fd, (size_t)size, 1, &rp->re_smap)) != 0)
-		goto err;
+		return (ret);
 	rp->re_cmap = rp->re_smap;
 	rp->re_emap = (u_int8_t *)rp->re_smap + (rp->re_msize = size);
 	rp->re_irec = F_ISSET(dbp, DB_RE_FIXEDLEN) ?  __ram_fmap : __ram_vmap;
 	return (0);
-
-err:	FREES(rp->re_source)
-	return (ret);
 }
 
 /*
@@ -906,17 +992,19 @@ err:	FREES(rp->re_source)
  *	Rewrite the backing file.
  */
 static int
-__ram_writeback(dbp)
-	DB *dbp;
+__ram_writeback(dbc)
+	DBC *dbc;
 {
-	RECNO *rp;
+	DB *dbp;
 	DBT key, data;
+	RECNO *rp;
 	db_recno_t keyno;
 	ssize_t nw;
 	int fd, ret, t_ret;
 	u_int8_t delim, *pad;
 
-	rp = ((BTREE *)dbp->internal)->bt_recno;
+	dbp = dbc->dbp;
+	rp = ((BTREE *)dbp->internal)->recno;
 
 	/* If the file wasn't modified, we're done. */
 	if (!F_ISSET(rp, RECNO_MODIFIED))
@@ -931,7 +1019,7 @@ __ram_writeback(dbp)
 	/*
 	 * Read any remaining records into the tree.
 	 *
-	 * XXX
+	 * !!!
 	 * This is why we can't support transactions when applications specify
 	 * backing (re_source) files.  At this point we have to read in the
 	 * rest of the records from the file so that we can write all of the
@@ -946,7 +1034,8 @@ __ram_writeback(dbp)
 	 * protecting the backing source file, i.e. mpool would have to know
 	 * about it, and we don't want to go there.
 	 */
-	if ((ret = __ram_snapshot(dbp)) != 0 && ret != DB_NOTFOUND)
+	if ((ret =
+	    __ram_update(dbc, DB_MAX_RECORDS, 0)) != 0 && ret != DB_NOTFOUND)
 		return (ret);
 
 	/*
@@ -962,7 +1051,7 @@ __ram_writeback(dbp)
 
 	/* Get rid of any backing file descriptor, just on GP's. */
 	if (rp->re_fd != -1) {
-		(void)__db_close(rp->re_fd);
+		(void)__os_close(rp->re_fd);
 		rp->re_fd = -1;
 	}
 
@@ -990,10 +1079,8 @@ __ram_writeback(dbp)
 	 */
 	delim = rp->re_delim;
 	if (F_ISSET(dbp, DB_RE_FIXEDLEN)) {
-		if ((pad = (u_int8_t *)__db_malloc(rp->re_len)) == NULL) {
-			ret = ENOMEM;
+		if ((ret = __os_malloc(rp->re_len, NULL, &pad)) != 0)
 			goto err;
-		}
 		memset(pad, rp->re_pad, rp->re_len);
 	} else
 		COMPQUIET(pad, NULL);
@@ -1001,7 +1088,7 @@ __ram_writeback(dbp)
 		switch (ret = dbp->get(dbp, NULL, &key, &data, 0)) {
 		case 0:
 			if ((ret =
-			    __db_write(fd, data.data, data.size, &nw)) != 0)
+			    __os_write(fd, data.data, data.size, &nw)) != 0)
 				goto err;
 			if (nw != (ssize_t)data.size) {
 				ret = EIO;
@@ -1011,7 +1098,7 @@ __ram_writeback(dbp)
 		case DB_KEYEMPTY:
 			if (F_ISSET(dbp, DB_RE_FIXEDLEN)) {
 				if ((ret =
-				    __db_write(fd, pad, rp->re_len, &nw)) != 0)
+				    __os_write(fd, pad, rp->re_len, &nw)) != 0)
 					goto err;
 				if (nw != (ssize_t)rp->re_len) {
 					ret = EIO;
@@ -1024,7 +1111,7 @@ __ram_writeback(dbp)
 			goto done;
 		}
 		if (!F_ISSET(dbp, DB_RE_FIXEDLEN)) {
-			if ((ret = __db_write(fd, &delim, 1, &nw)) != 0)
+			if ((ret = __os_write(fd, &delim, 1, &nw)) != 0)
 				goto err;
 			if (nw != 1) {
 				ret = EIO;
@@ -1035,7 +1122,7 @@ __ram_writeback(dbp)
 
 err:
 done:	/* Close the file descriptor. */
-	if ((t_ret = __db_close(fd)) != 0 || ret == 0)
+	if ((t_ret = __os_close(fd)) != 0 || ret == 0)
 		ret = t_ret;
 
 	if (ret == 0)
@@ -1048,11 +1135,11 @@ done:	/* Close the file descriptor. */
  *	Get fixed length records from a file.
  */
 static int
-__ram_fmap(dbp, top)
-	DB *dbp;
+__ram_fmap(dbc, top)
+	DBC *dbc;
 	db_recno_t top;
 {
-	BTREE *t;
+	DB *dbp;
 	DBT data;
 	RECNO *rp;
 	db_recno_t recno;
@@ -1060,24 +1147,23 @@ __ram_fmap(dbp, top)
 	u_int8_t *sp, *ep, *p;
 	int ret;
 
-	if ((ret = __bam_nrecs(dbp, &recno)) != 0)
+	if ((ret = __bam_nrecs(dbc, &recno)) != 0)
 		return (ret);
 
-	t = dbp->internal;
-	rp = t->bt_recno;
-	if (t->bt_rdata.ulen < rp->re_len) {
-		t->bt_rdata.data = t->bt_rdata.data == NULL ?
-		    (void *)__db_malloc(rp->re_len) :
-		    (void *)__db_realloc(t->bt_rdata.data, rp->re_len);
-		if (t->bt_rdata.data == NULL) {
-			t->bt_rdata.ulen = 0;
-			return (ENOMEM);
+	dbp = dbc->dbp;
+	rp = ((BTREE *)(dbp->internal))->recno;
+
+	if (dbc->rdata.ulen < rp->re_len) {
+		if ((ret = __os_realloc(&dbc->rdata.data, rp->re_len)) != 0) {
+			dbc->rdata.ulen = 0;
+			dbc->rdata.data = NULL;
+			return (ret);
 		}
-		t->bt_rdata.ulen = rp->re_len;
+		dbc->rdata.ulen = rp->re_len;
 	}
 
 	memset(&data, 0, sizeof(data));
-	data.data = t->bt_rdata.data;
+	data.data = dbc->rdata.data;
 	data.size = rp->re_len;
 
 	sp = (u_int8_t *)rp->re_cmap;
@@ -1088,7 +1174,7 @@ __ram_fmap(dbp, top)
 			return (DB_NOTFOUND);
 		}
 		len = rp->re_len;
-		for (p = t->bt_rdata.data;
+		for (p = dbc->rdata.data;
 		    sp < ep && len > 0; *p++ = *sp++, --len)
 			;
 
@@ -1108,7 +1194,7 @@ __ram_fmap(dbp, top)
 				memset(p, rp->re_pad, len);
 
 			++recno;
-			if ((ret = __ram_add(dbp, &recno, &data, 0, 0)) != 0)
+			if ((ret = __ram_add(dbc, &recno, &data, 0, 0)) != 0)
 				return (ret);
 		}
 		++rp->re_last;
@@ -1122,21 +1208,19 @@ __ram_fmap(dbp, top)
  *	Get variable length records from a file.
  */
 static int
-__ram_vmap(dbp, top)
-	DB *dbp;
+__ram_vmap(dbc, top)
+	DBC *dbc;
 	db_recno_t top;
 {
-	BTREE *t;
 	DBT data;
 	RECNO *rp;
 	db_recno_t recno;
 	u_int8_t *sp, *ep;
 	int delim, ret;
 
-	t = dbp->internal;
-	rp = t->bt_recno;
+	rp = ((BTREE *)(dbc->dbp->internal))->recno;
 
-	if ((ret = __bam_nrecs(dbp, &recno)) != 0)
+	if ((ret = __bam_nrecs(dbc, &recno)) != 0)
 		return (ret);
 
 	memset(&data, 0, sizeof(data));
@@ -1163,7 +1247,7 @@ __ram_vmap(dbp, top)
 		if (rp->re_last >= recno) {
 			data.size = sp - (u_int8_t *)data.data;
 			++recno;
-			if ((ret = __ram_add(dbp, &recno, &data, 0, 0)) != 0)
+			if ((ret = __ram_add(dbc, &recno, &data, 0, 0)) != 0)
 				return (ret);
 		}
 		++rp->re_last;
@@ -1178,40 +1262,47 @@ __ram_vmap(dbp, top)
  *	Add records into the tree.
  */
 static int
-__ram_add(dbp, recnop, data, flags, bi_flags)
-	DB *dbp;
+__ram_add(dbc, recnop, data, flags, bi_flags)
+	DBC *dbc;
 	db_recno_t *recnop;
 	DBT *data;
 	u_int32_t flags, bi_flags;
 {
 	BKEYDATA *bk;
-	BTREE *t;
+	CURSOR *cp;
+	DB *dbp;
 	PAGE *h;
 	db_indx_t indx;
 	int exact, isdeleted, ret, stack;
 
-	t = dbp->internal;
+	dbp = dbc->dbp;
+	cp = dbc->internal;
 
 retry:	/* Find the slot for insertion. */
-	if ((ret = __bam_rsearch(dbp, recnop,
-	    S_INSERT | (LF_ISSET(DB_APPEND) ? S_APPEND : 0), 1, &exact)) != 0)
+	if ((ret = __bam_rsearch(dbc, recnop,
+	    S_INSERT | (flags == DB_APPEND ? S_APPEND : 0), 1, &exact)) != 0)
 		return (ret);
-	h = t->bt_csp->page;
-	indx = t->bt_csp->indx;
+	h = cp->csp->page;
+	indx = cp->csp->indx;
 	stack = 1;
 
 	/*
+	 * If re-numbering records, the on-page deleted flag means this record
+	 * was implicitly created.  If not re-numbering records, the on-page
+	 * deleted flag means this record was implicitly created, or, it was
+	 * deleted at some time.
+	 *
 	 * If DB_NOOVERWRITE is set and the item already exists in the tree,
-	 * return an error unless the item has been marked for deletion.
+	 * return an error unless the item was either marked for deletion or
+	 * only implicitly created.
 	 */
 	isdeleted = 0;
 	if (exact) {
 		bk = GET_BKEYDATA(h, indx);
-		if (B_DISSET(bk->type)) {
+		if (B_DISSET(bk->type))
 			isdeleted = 1;
-			__bam_ca_replace(dbp, h->pgno, indx, REPLACE_SETUP);
-		} else
-			if (LF_ISSET(DB_NOOVERWRITE)) {
+		else
+			if (flags == DB_NOOVERWRITE) {
 				ret = DB_KEYEXIST;
 				goto err;
 			}
@@ -1224,40 +1315,42 @@ retry:	/* Find the slot for insertion. */
 	 * match, we're inserting a new key/data pair, before the search
 	 * location.
 	 */
-	switch (ret = __bam_iitem(dbp,
+	switch (ret = __bam_iitem(dbc,
 	    &h, &indx, NULL, data, exact ? DB_CURRENT : DB_BEFORE, bi_flags)) {
 	case 0:
 		/*
-		 * Done.  Clean up the cursor and adjust the internal page
-		 * counts.
+		 * Don't adjust anything.
+		 *
+		 * If we inserted a record, no cursors need adjusting because
+		 * the only new record it's possible to insert is at the very
+		 * end of the tree.  The necessary adjustments to the internal
+		 * page counts were made by __bam_iitem().
+		 *
+		 * If we overwrote a record, no cursors need adjusting because
+		 * future DBcursor->get calls will simply return the underlying
+		 * record (there's no adjustment made for the DB_CURRENT flag
+		 * when a cursor get operation immediately follows a cursor
+		 * delete operation, and the normal adjustment for the DB_NEXT
+		 * flag is still correct).
 		 */
-		if (isdeleted)
-			__bam_ca_replace(dbp, h->pgno, indx, REPLACE_SUCCESS);
 		break;
 	case DB_NEEDSPLIT:
-		/*
-		 * We have to split the page.  Back out the cursor setup,
-		 * discard the stack of pages, and do the split.
-		 */
-		if (isdeleted)
-			__bam_ca_replace(dbp, h->pgno, indx, REPLACE_FAILED);
-
-		(void)__bam_stkrel(dbp);
+		/* Discard the stack of pages and split the page. */
+		(void)__bam_stkrel(dbc, 0);
 		stack = 0;
 
-		if ((ret = __bam_split(dbp, recnop)) != 0)
-			break;
+		if ((ret = __bam_split(dbc, recnop)) != 0)
+			goto err;
 
 		goto retry;
 		/* NOTREACHED */
 	default:
-		if (isdeleted)
-			__bam_ca_replace(dbp, h->pgno, indx, REPLACE_FAILED);
-		break;
+		goto err;
 	}
 
+
 err:	if (stack)
-		__bam_stkrel(dbp);
+		__bam_stkrel(dbc, 0);
 
 	return (ret);
 }