Author: mjg
Date: Thu Dec 5 13:41:22 2019
New Revision: 355415
URL: https://svnweb.freebsd.org/changeset/base/355415
Log:
nullfs: locklessly check for entries in null_hashget
During random sampling over poudriere -j 104 over 10% of calls returned NULL.
Modified:
head/sys/fs/nullfs/null_subr.c
Modified: head/sys/fs/nullfs/null_subr.c
==============================================================================
--- head/sys/fs/nullfs/null_subr.c Thu Dec 5 13:40:10 2019
(r355414)
+++ head/sys/fs/nullfs/null_subr.c Thu Dec 5 13:41:22 2019
(r355415)
@@ -113,6 +113,8 @@ null_hashget(mp, lowervp)
* reference count (but NOT the lower vnode's VREF counter).
*/
hd = NULL_NHASH(lowervp);
+ if (LIST_EMPTY(hd))
+ return (NULLVP);
rw_rlock(&null_hash_lock);
LIST_FOREACH(a, hd, null_hash) {
if (a->null_lowervp == lowervp && NULLTOV(a)->v_mount == mp) {
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