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cache: simplify lockless dot lookups

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This commit is contained in:
Mateusz Guzik 2020-12-28 00:12:28 +00:00
parent 833dbf1e22
commit ff97bc034f
1 changed files with 9 additions and 10 deletions
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19
sys/kern/vfs_cache.c
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@ -4317,19 +4317,18 @@ cache_fplookup_noentry(struct cache_fpl *fpl)
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));
}
MPASS(!seqc_in_modify(fpl->dvp_seqc));
/*
* Just re-assign the value. seqc will be checked later for the first
* non-dot path component in line and/or before deciding to return the
* vnode.
*/
fpl->tvp = fpl->dvp;
fpl->tvp_seqc = fpl->dvp_seqc;
counter_u64_add(dothits, 1);
SDT_PROBE3(vfs, namecache, lookup, hit, dvp, ".", dvp);
SDT_PROBE3(vfs, namecache, lookup, hit, fpl->dvp, ".", fpl->dvp);
return (0);
}