tdb2: add tdb_attribute_tdb1_max_dead

This allows us to simulate the old "volatile" flag for tdb1.  It's not
necessary for tdb2.

As this is the last function in tdb1.h, we remove that file.

ccan/tdb2/open.c

@@ -388,6 +388,7 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 	struct tdb_header hdr;
 	struct tdb_attribute_seed *seed = NULL;
 	struct tdb_attribute_tdb1_hashsize *hsize_attr = NULL;
+	struct tdb_attribute_tdb1_max_dead *maxsize_attr = NULL;
 	tdb_bool_err berr;
 	enum TDB_ERROR ecode;
 	int openlock;
@@ -433,6 +434,9 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 		case TDB_ATTRIBUTE_TDB1_HASHSIZE:
 			hsize_attr = &attr->tdb1_hashsize;
 			break;
+		case TDB_ATTRIBUTE_TDB1_MAX_DEAD:
+			maxsize_attr = &attr->tdb1_max_dead;
+			break;
 		default:
 			/* These are set as normal. */
 			ecode = tdb_set_attribute(tdb, attr);
@@ -511,7 +515,7 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 		}
 		tdb->file->fd = -1;
 		if (tdb->flags & TDB_VERSION1)
-			ecode = tdb1_new_database(tdb, hsize_attr);
+			ecode = tdb1_new_database(tdb, hsize_attr, maxsize_attr);
 		else {
 			ecode = tdb_new_database(tdb, seed, &hdr);
 			if (ecode == TDB_SUCCESS) {
@@ -591,7 +595,7 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 	rlen = pread(tdb->file->fd, &hdr, sizeof(hdr), 0);
 	if (rlen == 0 && (open_flags & O_CREAT)) {
 		if (tdb->flags & TDB_VERSION1) {
-			ecode = tdb1_new_database(tdb, hsize_attr);
+			ecode = tdb1_new_database(tdb, hsize_attr, maxsize_attr);
 			if (ecode != TDB_SUCCESS)
 				goto fail;
 			goto finished;
@@ -608,7 +612,7 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 	} else if (rlen < sizeof(hdr)
 		   || strcmp(hdr.magic_food, TDB_MAGIC_FOOD) != 0) {
 		if (is_tdb1(&tdb->tdb1.header, &hdr, rlen)) {
-			ecode = tdb1_open(tdb);
+			ecode = tdb1_open(tdb, maxsize_attr);
 			if (!ecode)
 				goto finished;
 			goto fail;
@@ -623,7 +627,7 @@ struct tdb_context *tdb_open(const char *name, int tdb_flags,
 			tdb->flags |= TDB_CONVERT;
 		else {
 			if (is_tdb1(&tdb->tdb1.header, &hdr, rlen)) {
-				ecode = tdb1_open(tdb);
+				ecode = tdb1_open(tdb, maxsize_attr);
 				if (!ecode)
 					goto finished;
 				goto fail;

ccan/tdb2/private.h

@@ -639,8 +639,10 @@ int tdb1_check(struct tdb_context *tdb,
 
 /* tdb1_open.c: */
 int tdb1_new_database(struct tdb_context *tdb,
-		      struct tdb_attribute_tdb1_hashsize *hashsize);
-enum TDB_ERROR tdb1_open(struct tdb_context *tdb);
+		      struct tdb_attribute_tdb1_hashsize *hashsize,
+		      struct tdb_attribute_tdb1_max_dead *max_dead);
+enum TDB_ERROR tdb1_open(struct tdb_context *tdb,
+			 struct tdb_attribute_tdb1_max_dead *max_dead);
 
 /* tdb1_io.c: */
 enum TDB_ERROR tdb1_probe_length(struct tdb_context *tdb);

ccan/tdb2/tdb1.h

-#ifndef TDB1_H
-#define TDB1_H
-
-/*
-   Unix SMB/CIFS implementation.
-
-   trivial database library (version 1 compat functions)
-
-   Copyright (C) Andrew Tridgell 1999-2004
-   Copyright (C) Rusty Russell 2011
-
-     ** NOTE! The following LGPL license applies to the tdb
-     ** library. This does NOT imply that all of Samba is released
-     ** under the LGPL
-
-   This library is free software; you can redistribute it and/or
-   modify it under the terms of the GNU Lesser General Public
-   License as published by the Free Software Foundation; either
-   version 3 of the License, or (at your option) any later version.
-
-   This library is distributed in the hope that it will be useful,
-   but WITHOUT ANY WARRANTY; without even the implied warranty of
-   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-   Lesser General Public License for more details.
-
-   You should have received a copy of the GNU Lesser General Public
-   License along with this library; if not, see <http://www.gnu.org/licenses/>.
-*/
-#include "tdb2.h"
-
-#ifndef _SAMBA_BUILD_
-/* For mode_t */
-#include <sys/types.h>
-/* For O_* flags. */
-#include <sys/stat.h>
-#endif
-
-
-void tdb1_set_max_dead(struct tdb_context *tdb, int max_dead);
-
-/* @} ******************************************************************/
-
-#endif /* tdb1.h */

ccan/tdb2/tdb1_open.c

@@ -42,7 +42,8 @@ void tdb1_header_hash(struct tdb_context *tdb,
 		*magic1_hash = 1;
 }
 
-static void tdb_context_init(struct tdb_context *tdb)
+static void tdb_context_init(struct tdb_context *tdb,
+			     struct tdb_attribute_tdb1_max_dead *max_dead)
 {
 	assert(tdb->flags & TDB_VERSION1);
 
@@ -58,20 +59,24 @@ static void tdb_context_init(struct tdb_context *tdb)
 		tdb->tdb1.page_size = 0x2000;
 	}
 
-	/* FIXME: Used to be 5 for TDB_VOLATILE. */
-	tdb->tdb1.max_dead_records = 0;
+	if (max_dead) {
+		tdb->tdb1.max_dead_records = max_dead->max_dead;
+	} else {
+		tdb->tdb1.max_dead_records = 0;
+	}
 }
 
 /* initialise a new database */
 enum TDB_ERROR tdb1_new_database(struct tdb_context *tdb,
-				 struct tdb_attribute_tdb1_hashsize *hashsize)
+				 struct tdb_attribute_tdb1_hashsize *hashsize,
+				 struct tdb_attribute_tdb1_max_dead *max_dead)
 {
 	struct tdb1_header *newdb;
 	size_t size;
 	int hash_size = TDB1_DEFAULT_HASH_SIZE;
 	enum TDB_ERROR ret = TDB_ERR_IO;
 
-	tdb_context_init(tdb);
+	tdb_context_init(tdb, max_dead);
 
 	/* Default TDB2 hash becomes default TDB1 hash. */
 	if (tdb->hash_fn == tdb_jenkins_hash)
@@ -164,14 +169,15 @@ static bool check_header_hash(struct tdb_context *tdb,
 }
 
 /* We are hold the TDB open lock on tdb->fd. */
-enum TDB_ERROR tdb1_open(struct tdb_context *tdb)
+enum TDB_ERROR tdb1_open(struct tdb_context *tdb,
+			 struct tdb_attribute_tdb1_max_dead *max_dead)
 {
 	const char *hash_alg;
 	uint32_t magic1, magic2;
 
 	tdb->flags |= TDB_VERSION1;
 
-	tdb_context_init(tdb);
+	tdb_context_init(tdb, max_dead);
 
 	/* Default TDB2 hash becomes default TDB1 hash. */
 	if (tdb->hash_fn == tdb_jenkins_hash) {
@@ -216,12 +222,3 @@ enum TDB_ERROR tdb1_open(struct tdb_context *tdb)
 	}
 	return TDB_SUCCESS;
 }
-
-/*
- * Set the maximum number of dead records per hash chain
- */
-
-void tdb1_set_max_dead(struct tdb_context *tdb, int max_dead)
-{
-	tdb->tdb1.max_dead_records = max_dead;
-}

ccan/tdb2/tdb1_private.h

@@ -26,7 +26,6 @@
 */
 
 #include "private.h"
-#include "tdb1.h"
 
 #include <limits.h>
 

ccan/tdb2/tdb2.h

@@ -631,6 +631,7 @@ enum tdb_attribute_type {
 	TDB_ATTRIBUTE_OPENHOOK = 4,
 	TDB_ATTRIBUTE_FLOCK = 5,
 	TDB_ATTRIBUTE_TDB1_HASHSIZE = 128,
+	TDB_ATTRIBUTE_TDB1_MAX_DEAD = 129,
 };
 
 /**
@@ -875,6 +876,19 @@ struct tdb_attribute_tdb1_hashsize {
 	unsigned int hsize;
 };
 
+/**
+ * struct tdb_attribute_tdb1_max_dead - tdb1 number of maximum dead records.
+ *
+ * TDB1 has a method to speed up its slow free list: it lets a certain
+ * number of "dead" records build up before freeing them.  This is
+ * particularly useful for volatile TDBs; setting it to 5 is
+ * equivalent to tdb1's TDB_VOLATILE flag.
+ */
+struct tdb_attribute_tdb1_max_dead {
+	struct tdb_attribute_base base; /* .attr = TDB_ATTRIBUTE_TDB1_MAX_DEAD */
+	unsigned int max_dead;
+};
+
 /**
  * union tdb_attribute - tdb attributes.
  *
@@ -894,6 +908,7 @@ union tdb_attribute {
 	struct tdb_attribute_openhook openhook;
 	struct tdb_attribute_flock flock;
 	struct tdb_attribute_tdb1_hashsize tdb1_hashsize;
+	struct tdb_attribute_tdb1_max_dead tdb1_max_dead;
 };
 
 #ifdef  __cplusplus

ccan/tdb2/test/failtest_helper.h

@@ -4,7 +4,7 @@
 #include <stdbool.h>
 
 /* FIXME: Check these! */
-#define INITIAL_TDB_MALLOC	"open.c", 395, FAILTEST_MALLOC
+#define INITIAL_TDB_MALLOC	"open.c", 396, FAILTEST_MALLOC
 #define URANDOM_OPEN		"open.c", 62, FAILTEST_OPEN
 #define URANDOM_READ		"open.c", 42, FAILTEST_READ
 

ccan/tdb2/test/tdb1-external-agent.c

@@ -10,7 +10,6 @@
 #include <limits.h>
 #include <string.h>
 #include <errno.h>
-#include <ccan/tdb2/tdb1.h>
 #include <ccan/tdb2/tdb1_private.h>
 #include <ccan/tap/tap.h>
 #include <stdio.h>