X-Git-Url: https://git.ozlabs.org/?p=ccan;a=blobdiff_plain;f=ccan%2Ftdb2%2Ftest%2Flayout.c;h=3049d3214e62736ec95ddbe979cafe7784034593;hp=04111b4a697dd2d7bdbe43701e91cd21a6760caa;hb=dfae76fd82d4bbd8989264dadc2c3c9cde7e5af7;hpb=54c087e9b147c70a06fe5e7543e39aa70d406b6d

diff --git a/ccan/tdb2/test/layout.c b/ccan/tdb2/test/layout.c
index 04111b4a..3049d321 100644
--- a/ccan/tdb2/test/layout.c
+++ b/ccan/tdb2/test/layout.c
@@ -23,23 +23,20 @@ static void add(struct tdb_layout *layout, union tdb_layout_elem elem)
 	layout->elem[layout->num_elems++] = elem;
 }
 
-void tdb_layout_add_zone(struct tdb_layout *layout,
-			 unsigned int zone_bits,
-			 bool fill_prev)
+void tdb_layout_add_freelist(struct tdb_layout *layout)
 {
 	union tdb_layout_elem elem;
-	if (fill_prev)
-		tdb_layout_add_free(layout, 0);
-	elem.base.type = ZONE;
-	elem.zone.zone_bits = zone_bits;
+	elem.base.type = FREELIST;
 	add(layout, elem);
 }
 
-void tdb_layout_add_free(struct tdb_layout *layout, tdb_len_t len)
+void tdb_layout_add_free(struct tdb_layout *layout, tdb_len_t len,
+			 unsigned flist)
 {
 	union tdb_layout_elem elem;
 	elem.base.type = FREE;
 	elem.free.len = len;
+	elem.free.flist_num = flist;
 	add(layout, elem);
 }
 
@@ -85,10 +82,9 @@ static tdb_len_t hashtable_len(struct tle_hashtable *htable)
 		+ htable->extra;
 }
 
-static tdb_len_t zone_header_len(struct tle_zone *zone)
+static tdb_len_t freelist_len(struct tle_freelist *flist)
 {
-	return sizeof(struct free_zone_header)
-		+ sizeof(tdb_off_t) * (BUCKETS_FOR_ZONE(zone->zone_bits)+1);
+	return sizeof(struct tdb_freelist);
 }
 
 static void set_free_record(void *mem, tdb_len_t len)
@@ -97,47 +93,53 @@ static void set_free_record(void *mem, tdb_len_t len)
 }
 
 static void set_data_record(void *mem, struct tdb_context *tdb,
-			    struct tle_zone *last_zone,
 			    struct tle_used *used)
 {
 	struct tdb_used_record *u = mem;
 
-	set_header(tdb, u, used->key.dsize, used->data.dsize,
-		   used->key.dsize + used->data.dsize + used->extra,
-		   tdb_hash(tdb, used->key.dptr, used->key.dsize),
-		   last_zone->zone_bits);
+	set_used_header(tdb, u, used->key.dsize, used->data.dsize,
+			used->key.dsize + used->data.dsize + used->extra,
+			tdb_hash(tdb, used->key.dptr, used->key.dsize));
 	memcpy(u + 1, used->key.dptr, used->key.dsize);
 	memcpy((char *)(u + 1) + used->key.dsize,
 	       used->data.dptr, used->data.dsize);
 }
 
 static void set_hashtable(void *mem, struct tdb_context *tdb,
-			  struct tle_zone *last_zone,
 			  struct tle_hashtable *htable)
 {
 	struct tdb_used_record *u = mem;
 	tdb_len_t len = sizeof(tdb_off_t) << TDB_SUBLEVEL_HASH_BITS;
 
-	set_header(tdb, u, 0, len, len + htable->extra, 0,
-		   last_zone->zone_bits);
+	set_used_header(tdb, u, 0, len, len + htable->extra, 0);
 	memset(u + 1, 0, len);
 }
 
-static void set_zone(void *mem, struct tdb_context *tdb,
-		     struct tle_zone *zone)
+static void set_freelist(void *mem, struct tdb_context *tdb,
+			 struct tle_freelist *freelist, struct tdb_header *hdr,
+			 tdb_off_t last_flist)
 {
-	struct free_zone_header *fz = mem;
-	memset(fz, 0, zone_header_len(zone));
-	fz->zone_bits = zone->zone_bits;
+	struct tdb_freelist *flist = mem;
+	memset(flist, 0, sizeof(*flist));
+	set_used_header(tdb, &flist->hdr, 0,
+			sizeof(*flist) - sizeof(flist->hdr),
+			sizeof(*flist) - sizeof(flist->hdr), 1);
+
+	if (last_flist) {
+		flist = (struct tdb_freelist *)((char *)hdr + last_flist);
+		flist->next = freelist->base.off;
+	} else {
+		hdr->free_list = freelist->base.off;
+	}
 }
 
 static void add_to_freetable(struct tdb_context *tdb,
-			     struct tle_zone *last_zone,
 			     tdb_off_t eoff,
-			     tdb_off_t elen)
+			     tdb_off_t elen,
+			     struct tle_freelist *freelist)
 {
-	add_free_record(tdb, last_zone->zone_bits, eoff,
-			sizeof(struct tdb_used_record) + elen);
+	tdb->flist_off = freelist->base.off;
+	add_free_record(tdb, eoff, sizeof(struct tdb_used_record) + elen);
 }
 
 static tdb_off_t hbucket_off(tdb_off_t group_start, unsigned ingroup)
@@ -200,19 +202,28 @@ static void add_to_hashtable(struct tdb_context *tdb,
 	abort();
 }
 
+static struct tle_freelist *find_flist(struct tdb_layout *layout, unsigned num)
+{
+	unsigned i;
+
+	for (i = 0; i < layout->num_elems; i++) {
+		if (layout->elem[i].base.type != FREELIST)
+			continue;
+		if (num == 0)
+			return &layout->elem[i].flist;
+		num--;
+	}
+	abort();
+}
+
 /* FIXME: Support TDB_CONVERT */
 struct tdb_context *tdb_layout_get(struct tdb_layout *layout)
 {
 	unsigned int i;
-	tdb_off_t off, len;
-	tdb_len_t zone_left;
+	tdb_off_t off, len, last_flist;
 	char *mem;
 	struct tdb_context *tdb;
-	struct tle_zone *last_zone = NULL;
-
-	assert(layout->elem[0].base.type == ZONE);
 
-	zone_left = 0;
 	off = sizeof(struct tdb_header);
 
 	/* First pass of layout: calc lengths */
@@ -220,15 +231,10 @@ struct tdb_context *tdb_layout_get(struct tdb_layout *layout)
 		union tdb_layout_elem *e = &layout->elem[i];
 		e->base.off = off;
 		switch (e->base.type) {
-		case ZONE:
-			assert(zone_left == 0);
-			len = zone_header_len(&e->zone);
-			zone_left = 1ULL << e->zone.zone_bits;
+		case FREELIST:
+			len = freelist_len(&e->flist);
 			break;
 		case FREE:
-			if (e->free.len == 0)
-				e->free.len = zone_left
-					- sizeof(struct tdb_used_record);
 			len = free_record_len(e->free.len);
 			break;
 		case DATA:
@@ -241,20 +247,9 @@ struct tdb_context *tdb_layout_get(struct tdb_layout *layout)
 			abort();
 		}
 		off += len;
-		assert(zone_left >= len);
-		zone_left -= len;
-	}
-
-	/* Fill final zone with free record. */
-	if (zone_left != 0) {
-		tdb_layout_add_free(layout,
-				    zone_left
-				    - sizeof(struct tdb_used_record));
-		layout->elem[layout->num_elems-1].base.off = off;
-		off += zone_left;
 	}
 
-	mem = malloc(off+1);
+	mem = malloc(off);
 	/* Now populate our header, cribbing from a real TDB header. */
 	tdb = tdb_open(NULL, TDB_INTERNAL, O_RDWR, 0, &tap_log_attr);
 	memcpy(mem, tdb->map_ptr, sizeof(struct tdb_header));
@@ -262,39 +257,38 @@ struct tdb_context *tdb_layout_get(struct tdb_layout *layout)
 	/* Mug the tdb we have to make it use this. */
 	free(tdb->map_ptr);
 	tdb->map_ptr = mem;
-	tdb->map_size = off+1;
+	tdb->map_size = off;
 
+	last_flist = 0;
 	for (i = 0; i < layout->num_elems; i++) {
 		union tdb_layout_elem *e = &layout->elem[i];
 		switch (e->base.type) {
-		case ZONE:
-			set_zone(mem + e->base.off, tdb, &e->zone);
-			last_zone = &e->zone;
+		case FREELIST:
+			set_freelist(mem + e->base.off, tdb, &e->flist,
+				     (struct tdb_header *)mem, last_flist);
+			last_flist = e->base.off;
 			break;
 		case FREE:
 			set_free_record(mem + e->base.off, e->free.len);
 			break;
 		case DATA:
-			set_data_record(mem + e->base.off, tdb, last_zone,
-					&e->used);
+			set_data_record(mem + e->base.off, tdb, &e->used);
 			break;
 		case HASHTABLE:
-			set_hashtable(mem + e->base.off, tdb, last_zone,
-				      &e->hashtable);
+			set_hashtable(mem + e->base.off, tdb, &e->hashtable);
 			break;
 		}
 	}
+	/* Must have a free list! */
+	assert(last_flist);
 
 	/* Now fill the free and hash tables. */
 	for (i = 0; i < layout->num_elems; i++) {
 		union tdb_layout_elem *e = &layout->elem[i];
 		switch (e->base.type) {
-		case ZONE:
-			last_zone = &e->zone;
-			break;
 		case FREE:
-			add_to_freetable(tdb, last_zone,
-					 e->base.off, e->free.len);
+			add_to_freetable(tdb, e->base.off, e->free.len,
+					 find_flist(layout, e->free.flist_num));
 			break;
 		case DATA:
 			add_to_hashtable(tdb, e->base.off, e->used.key);
@@ -304,8 +298,7 @@ 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;
+	tdb->flist_off = find_flist(layout, 0)->base.off;
 
 	/* Get physical if they asked for it. */
 	if (layout->filename) {
@@ -321,5 +314,6 @@ struct tdb_context *tdb_layout_get(struct tdb_layout *layout)
 		tdb = tdb_open(layout->filename, TDB_NOMMAP, O_RDWR, 0,
 			       &tap_log_attr);
 	}
+
 	return tdb;
 }