static int ileaf_merge(struct btree *btree, void *vinto, void *vfrom)
{
struct ileaf *into = vinto, *from = vfrom;
unsigned fromcount = icount(from);
/* If "from" is empty, does nothing */
if (!fromcount)
return 1;
assert(ibase(from) > ibase(into));
tuxkey_t fromibase = ibase(from);
unsigned count = icount(into);
int hole = fromibase - ibase(into) + count;
__be16 *dict = ileaf_dict(btree, into);
__be16 *fromdict = ileaf_dict(btree, from);
int need_size = hole * sizeof(*dict) + ileaf_need(btree, from);
if (ileaf_free(btree, into) < need_size)
return 0;
/* Fill hole of dict until from_ibase */
unsigned limit = atdict(dict, count);
__be16 __limit = cpu_to_be16(limit);
while (hole--) {
count++;
*(dict - count) = __limit;
}
/* Copy data from "from" */
unsigned fromlimit = atdict(fromdict, fromcount);
memcpy(into->table + limit, from->table, fromlimit);
/* Adjust copying fromdict */
if (limit) {
int i;
for (i = 1; i <= fromcount; i++)
add_idict(dict - i, limit);
}
veccopy(dict - count - fromcount, fromdict - fromcount, fromcount);
into->count = cpu_to_be16(count + fromcount);
return 1;
}
static int ileaf_free(struct btree *btree, struct ileaf *ileaf)
{
return btree->sb->blocksize
- ileaf_need(btree, ileaf) - sizeof(struct ileaf);
}
static unsigned ileaf_free(struct btree *btree, vleaf *leaf)
{
return btree->sb->blocksize - ileaf_need(btree, leaf) - sizeof(struct ileaf);
}
