tdb2: extend test/layout to be able to place in file.

This was for lockcheck, but that didn't work very well.  Seems like a useful
addition nonetheless.

ccan/tdb2/test/layout.c

@@ -3,11 +3,13 @@
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
+#include <err.h>
 #include "logging.h"
 
-struct tdb_layout *new_tdb_layout(void)
+struct tdb_layout *new_tdb_layout(const char *filename)
 {
 	struct tdb_layout *layout = malloc(sizeof(*layout));
+	layout->filename = filename;
 	layout->num_elems = 0;
 	layout->elem = NULL;
 	return layout;
@@ -302,5 +304,19 @@ struct tdb_context *tdb_layout_get(struct tdb_layout *layout)
 
 	/* Write tailer. */
 	((uint8_t *)tdb->map_ptr)[tdb->map_size-1] = last_zone->zone_bits;
+
+	/* Get physical if they asked for it. */
+	if (layout->filename) {
+		int fd = open(layout->filename, O_WRONLY|O_TRUNC|O_CREAT,
+			      0600);
+		if (fd < 0)
+			err(1, "opening %s for writing", layout->filename);
+		write(fd, tdb->map_ptr, tdb->map_size);
+		close(fd);
+		tdb_close(tdb);
+		/* NOMMAP is for lockcheck. */
+		tdb = tdb_open(layout->filename, TDB_NOMMAP, O_RDWR, 0,
+			       &tap_log_attr);
+	}
 	return tdb;
 }

ccan/tdb2/test/layout.h

@@ -2,7 +2,7 @@
 #define TDB2_TEST_LAYOUT_H
 #include <ccan/tdb2/private.h>
 
-struct tdb_layout *new_tdb_layout(void);
+struct tdb_layout *new_tdb_layout(const char *filename);
 void tdb_layout_add_zone(struct tdb_layout *layout,
 			 unsigned int zone_bits,
 			 bool fill_prev);
@@ -61,6 +61,7 @@ union tdb_layout_elem {
 };
 
 struct tdb_layout {
+	const char *filename;
 	unsigned int num_elems;
 	union tdb_layout_elem *elem;
 };

ccan/tdb2/test/run-03-coalesce.c

@@ -37,7 +37,7 @@ int main(int argc, char *argv[])
 	key.dsize = 5;
 
 	/* No coalescing can be done due to EOF */
-	layout = new_tdb_layout();
+	layout = new_tdb_layout(NULL);
 	tdb_layout_add_zone(layout, zone_bits, false);
 	tdb = tdb_layout_get(layout);
 	len = layout->elem[1].free.len;
@@ -57,7 +57,7 @@ int main(int argc, char *argv[])
 	tdb_close(tdb);
 
 	/* No coalescing can be done due to used record */
-	layout = new_tdb_layout();
+	layout = new_tdb_layout(NULL);
 	tdb_layout_add_zone(layout, zone_bits, false);
 	tdb_layout_add_free(layout, 1024);
 	tdb_layout_add_used(layout, key, data, 6);
@@ -78,7 +78,7 @@ int main(int argc, char *argv[])
 	tdb_close(tdb);
 
 	/* Coalescing can be done due to two free records, then EOF */
-	layout = new_tdb_layout();
+	layout = new_tdb_layout(NULL);
 	tdb_layout_add_zone(layout, zone_bits, false);
 	tdb_layout_add_free(layout, 1024);
 	tdb = tdb_layout_get(layout);
@@ -101,7 +101,7 @@ int main(int argc, char *argv[])
 	tdb_close(tdb);
 
 	/* Coalescing can be done due to two free records, then data */
-	layout = new_tdb_layout();
+	layout = new_tdb_layout(NULL);
 	tdb_layout_add_zone(layout, zone_bits, false);
 	tdb_layout_add_free(layout, 1024);
 	tdb_layout_add_free(layout, 512);
@@ -125,7 +125,7 @@ int main(int argc, char *argv[])
 	tdb_close(tdb);
 
 	/* Coalescing can be done due to three free records, then EOF */
-	layout = new_tdb_layout();
+	layout = new_tdb_layout(NULL);
 	tdb_layout_add_zone(layout, zone_bits, false);
 	tdb_layout_add_free(layout, 1024);
 	tdb_layout_add_free(layout, 512);
@@ -151,7 +151,7 @@ int main(int argc, char *argv[])
 	tdb_close(tdb);
 
 	/* Coalescing across two zones isn't possible. */
-	layout = new_tdb_layout();
+	layout = new_tdb_layout(NULL);
 	tdb_layout_add_zone(layout, zone_bits, false);
 	tdb_layout_add_zone(layout, zone_bits, true);
 	tdb = tdb_layout_get(layout);