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cache: let SAVESTART passthrough

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The flag is only passed for non-LOOKUP ops and those fallback to the slowpath.
This commit is contained in:
Mateusz Guzik 2020-08-10 12:28:56 +00:00
parent bb48255cf5
commit 5e79447d60
1 changed files with 5 additions and 2 deletions
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7
sys/kern/vfs_cache.c
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@ -3146,7 +3146,7 @@ cache_fpl_handled_impl(struct cache_fpl *fpl, int error, int line)
#define CACHE_FPL_SUPPORTED_CN_FLAGS \
(LOCKLEAF | LOCKPARENT | WANTPARENT | NOCACHE | FOLLOW | LOCKSHARED | SAVENAME | \
WILLBEDIR | ISOPEN | NOMACCHECK | AUDITVNODE1 | AUDITVNODE2)
SAVESTART | WILLBEDIR | ISOPEN | NOMACCHECK | AUDITVNODE1 | AUDITVNODE2)
#define CACHE_FPL_INTERNAL_CN_FLAGS \
(ISDOTDOT | MAKEENTRY | ISLASTCN)
@ -3654,7 +3654,7 @@ cache_fplookup_next(struct cache_fpl *fpl)
/*
* If they want to create an entry we need to replace this one.
*/
if (__predict_false(fpl->cnp->cn_nameiop == CREATE)) {
if (__predict_false(fpl->cnp->cn_nameiop != LOOKUP)) {
return (cache_fpl_partial(fpl));
}
negstate = NCP2NEGSTATE(ncp);
@ -4126,6 +4126,9 @@ cache_fplookup(struct nameidata *ndp, enum cache_fpl_status *status,
fpl.cnp = &ndp->ni_cnd;
MPASS(curthread == fpl.cnp->cn_thread);
if ((fpl.cnp->cn_flags & SAVESTART) != 0)
MPASS(fpl.cnp->cn_nameiop != LOOKUP);
if (!cache_can_fplookup(&fpl)) {
SDT_PROBE3(vfs, fplookup, lookup, done, ndp, fpl.line, fpl.status);
*status = fpl.status;