upas/fs: fix infinite loop in putcache

Force the cacheclear operation in the LRU cache trimming loop in order
to guarantee that the cache becomes smaller with each iteration.

Without the force flag cacheclear is a no-op for mailboxes that do not
provide a fetch function, e.g. POP3.

diff --git a/sys/src/cmd/upas/fs/cache.c b/sys/src/cmd/upas/fs/cache.c
index 2328859dc868c8a0c8bd35896202d4ff3e4145f9..5382d08b0e2351085fd9498bc8ed2669880ad30e 100644 (file)
--- a/sys/src/cmd/upas/fs/cache.c
+++ b/sys/src/cmd/upas/fs/cache.c
@@ -100,7 +100,7 @@ putcache(Mailbox *mb, Message *m)
                                return;
                        addlru(mb, mb->lru);
                }
-               cachefree(mb, mb->lru, 0);
+               cachefree(mb, mb->lru, 1);
        }
 }