afs: shake harder in shake-loose-vcaches

[openafs.git] / src / afs / afs_vcache.c

diff --git a/src/afs/afs_vcache.c b/src/afs/afs_vcache.c
index c2b0d5a..1403254 100644 (file)
--- a/src/afs/afs_vcache.c
+++ b/src/afs/afs_vcache.c
@@ -752,6 +752,7 @@ int
 afs_ShakeLooseVCaches(afs_int32 anumber)
 {
     afs_int32 i, loop;
+    int evicted;
     struct vcache *tvc;
     struct afs_q *tq, *uq;
     int fv_slept, defersleep = 0;
@@ -779,12 +780,23 @@ afs_ShakeLooseVCaches(afs_int32 anumber)
        }
 
        fv_slept = 0;
-       if (osi_TryEvictVCache(tvc, &fv_slept, defersleep))
+       evicted = osi_TryEvictVCache(tvc, &fv_slept, defersleep);
+       if (evicted) {
            anumber--;
+       }
 
        if (fv_slept) {
            if (loop++ > 100)
                break;
+           if (!evicted) {
+               /*
+                * This vcache was busy and we slept while trying to evict it.
+                * Move this busy vcache to the head of the VLRU so vcaches
+                * following this busy vcache can be evicted during the retry.
+                */
+               QRemove(&tvc->vlruq);
+               QAdd(&VLRU, &tvc->vlruq);
+           }
            goto retry; /* start over - may have raced. */
        }
        if (uq == &VLRU) {