Author: mjg
Date: Tue Aug 4 19:54:37 2020
New Revision: 363857
URL: https://svnweb.freebsd.org/changeset/base/363857
Log:
cache: factor away lockless dot lookup and add missing stat + sdt probe
Modified:
head/sys/kern/vfs_cache.c
Modified: head/sys/kern/vfs_cache.c
==============================================================================
--- head/sys/kern/vfs_cache.c Tue Aug 4 19:54:10 2020 (r363856)
+++ head/sys/kern/vfs_cache.c Tue Aug 4 19:54:37 2020 (r363857)
@@ -3356,6 +3356,25 @@ cache_fplookup_final(struct cache_fpl *fpl)
return (cache_fplookup_final_child(fpl, tvs));
}
+static int __noinline
+cache_fplookup_dot(struct cache_fpl *fpl)
+{
+ struct vnode *dvp;
+
+ dvp = fpl->dvp;
+
+ fpl->tvp = dvp;
+ fpl->tvp_seqc = vn_seqc_read_any(dvp);
+ if (seqc_in_modify(fpl->tvp_seqc)) {
+ return (cache_fpl_aborted(fpl));
+ }
+
+ counter_u64_add(dothits, 1);
+ SDT_PROBE3(vfs, namecache, lookup, hit, dvp, ".", dvp);
+
+ return (0);
+}
+
static int
cache_fplookup_next(struct cache_fpl *fpl)
{
@@ -3371,12 +3390,7 @@ cache_fplookup_next(struct cache_fpl *fpl)
dvp = fpl->dvp;
if (__predict_false(cnp->cn_namelen == 1 && cnp->cn_nameptr[0] == '.'))
{
- fpl->tvp = dvp;
- fpl->tvp_seqc = vn_seqc_read_any(dvp);
- if (seqc_in_modify(fpl->tvp_seqc)) {
- return (cache_fpl_aborted(fpl));
- }
- return (0);
+ return (cache_fplookup_dot(fpl));
}
hash = cache_get_hash(cnp->cn_nameptr, cnp->cn_namelen, dvp);
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