pack: move release_pack_memory()

diff --git a/packfile.c b/packfile.c
index 6edc432288b40d8f378e2bab5b9f0182b4c4bea9..8daa74ad11b5d473235fba9fa5270aaaf81689e6 100644 (file)
--- a/packfile.c
+++ b/packfile.c
@@ -208,3 +208,52 @@ struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path)
 
        return p;
 }
+
+static void scan_windows(struct packed_git *p,
+       struct packed_git **lru_p,
+       struct pack_window **lru_w,
+       struct pack_window **lru_l)
+{
+       struct pack_window *w, *w_l;
+
+       for (w_l = NULL, w = p->windows; w; w = w->next) {
+               if (!w->inuse_cnt) {
+                       if (!*lru_w || w->last_used < (*lru_w)->last_used) {
+                               *lru_p = p;
+                               *lru_w = w;
+                               *lru_l = w_l;
+                       }
+               }
+               w_l = w;
+       }
+}
+
+int unuse_one_window(struct packed_git *current)
+{
+       struct packed_git *p, *lru_p = NULL;
+       struct pack_window *lru_w = NULL, *lru_l = NULL;
+
+       if (current)
+               scan_windows(current, &lru_p, &lru_w, &lru_l);
+       for (p = packed_git; p; p = p->next)
+               scan_windows(p, &lru_p, &lru_w, &lru_l);
+       if (lru_p) {
+               munmap(lru_w->base, lru_w->len);
+               pack_mapped -= lru_w->len;
+               if (lru_l)
+                       lru_l->next = lru_w->next;
+               else
+                       lru_p->windows = lru_w->next;
+               free(lru_w);
+               pack_open_windows--;
+               return 1;
+       }
+       return 0;
+}
+
+void release_pack_memory(size_t need)
+{
+       size_t cur = pack_mapped;
+       while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
+               ; /* nothing */
+}