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cache: predict on no spurious slashes in cache_fpl_handle_root

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This is a step towards speculatively not handling them.
This commit is contained in:
Mateusz Guzik 2021-01-01 02:25:19 +00:00
parent 30a2fc91fa
commit 7220a10b5b
1 changed files with 9 additions and 3 deletions
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12
sys/kern/vfs_cache.c
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@ -3623,9 +3623,15 @@ cache_fpl_handle_root(struct cache_fpl *fpl)
ndp = fpl->ndp;
cnp = fpl->cnp;
while (*(cnp->cn_nameptr) == '/') {
cnp->cn_nameptr++;
ndp->ni_pathlen--;
MPASS(*(cnp->cn_nameptr) == '/');
cnp->cn_nameptr++;
ndp->ni_pathlen--;
if (__predict_false(*(cnp->cn_nameptr) == '/')) {
do {
cnp->cn_nameptr++;
ndp->ni_pathlen--;
} while (*(cnp->cn_nameptr) == '/');
}
return (ndp->ni_rootdir);