* Sebastian Hammer, Adam Dickmeiss
*
* $Log: commit.c,v $
- * Revision 1.10 1996-04-18 16:02:56 adam
+ * Revision 1.11 1996-04-23 12:36:41 adam
+ * Started work on more efficient commit operation.
+ *
+ * Revision 1.10 1996/04/18 16:02:56 adam
* Changed logging a bit.
* Removed warning message when commiting flat shadow files.
*
mf_unlink (cf->hash_mf);
}
+
+struct map_cache_entity {
+ int from;
+ int to;
+};
+
+struct map_cache {
+ int max;
+ int no;
+
+ struct map_cache_entity *map;
+ char *buf;
+ CFile cf;
+};
+
+static struct map_cache *map_cache_init (CFile cf)
+{
+ int mem_max = 2000000;
+ struct map_cache *m_p;
+
+ m_p = xmalloc (sizeof(*m_p));
+ m_p->cf = cf;
+ m_p->max = mem_max / cf->head.block_size;
+ m_p->buf = xmalloc (mem_max);
+ m_p->no = 0;
+ m_p->map = xmalloc (sizeof(*m_p->map) * m_p->max);
+ return m_p;
+}
+
+static void map_cache_del (struct map_cache *m_p)
+{
+ xfree (m_p->map);
+ xfree (m_p->buf);
+ xfree (m_p);
+}
+
+static int map_cache_cmp_from (const void *p1, const void *p2)
+{
+ return ((struct map_cache_entity*) p1)->from -
+ ((struct map_cache_entity*) p2)->from;
+}
+
+static int map_cache_cmp_to (const void *p1, const void *p2)
+{
+ return ((struct map_cache_entity*) p1)->to -
+ ((struct map_cache_entity*) p2)->to;
+}
+
+static void map_cache_flush (struct map_cache *m_p)
+{
+ int i;
+
+ qsort (m_p->map, m_p->no, sizeof(*m_p->map), map_cache_cmp_from);
+ for (i = 0; i<m_p->no; i++)
+ {
+ if (!mf_read (m_p->cf->block_mf, m_p->map[i].from, 0, 0,
+ m_p->buf + i * m_p->cf->head.block_size))
+ {
+ logf (LOG_FATAL, "read commit block");
+ exit (1);
+ }
+ m_p->map[i].from = i;
+ }
+ qsort (m_p->map, m_p->no, sizeof(*m_p->map), map_cache_cmp_to);
+ for (i = 0; i<m_p->no; i++)
+ {
+ mf_write (m_p->cf->rmf, m_p->map[i].to, 0, 0,
+ m_p->buf + m_p->map[i].from * m_p->cf->head.block_size);
+ }
+}
+
+static void map_cache_add (struct map_cache *m_p, int from, int to)
+{
+ int i = m_p->no;
+
+ m_p->map[i].from = from;
+ m_p->map[i].to = to;
+ m_p->no = ++i;
+ if (i == m_p->max)
+ map_cache_flush (m_p);
+}
static void cf_commit_hash (CFile cf)
{