afs: Add a little more info on SLVC loop panic

If we panic due to a perceived infinite loop, log a little more info
about our loop iterations.

Reviewed-on: http://gerrit.openafs.org/8850
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Marc Dionne <marc.c.dionne@gmail.com>
Reviewed-by: Chas Williams - CONTRACTOR <chas@cmf.nrl.navy.mil>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
(cherry picked from commit 2f087dc434f62cfa7888434427eaac6803b563ab)

Change-Id: Ie4a02a40fafa88f8b54b05b8a0926f258ae7cf7a
Reviewed-on: http://gerrit.openafs.org/9509
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@your-file-system.com>
Reviewed-by: Andrew Deason <adeason@sinenomine.net>
Reviewed-by: Michael Meffie <mmeffie@sinenomine.net>
Reviewed-by: Stephan Wiesand <stephan.wiesand@desy.de>

diff --git a/src/afs/afs_vcache.c b/src/afs/afs_vcache.c
index a9a323292589bd7b6a08cae5b140d49ca2a38599..96cb5883729117da004e61a2d599c774e6cb5d48 100644 (file)
--- a/src/afs/afs_vcache.c
+++ b/src/afs/afs_vcache.c
@@ -675,6 +675,8 @@ afs_ShakeLooseVCaches(afs_int32 anumber)
        if (tvc->f.states & CVFlushed) {
            refpanic("CVFlushed on VLRU");
        } else if (i++ > limit) {
+           afs_warn("afs_ShakeLooseVCaches: i %d limit %d afs_vcount %d afs_maxvcount %d\n",
+                    (int)i, limit, (int)afs_vcount, (int)afs_maxvcount);
            refpanic("Found too many AFS vnodes on VLRU (VLRU cycle?)");
        } else if (QNext(uq) != tq) {
            refpanic("VLRU inconsistent");