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cache: factor away lockless dot lookup and add missing stat + sdt probe

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This commit is contained in:
Mateusz Guzik 2020-08-04 19:54:37 +00:00
parent 17a66c7087
commit 18bd02e2ce
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=363857
1 changed files with 20 additions and 6 deletions
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26
sys/kern/vfs_cache.c
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@ -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);