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vfs: add support for !LOCKLEAF to lockless lookup

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Tested by:      pho (in a patchset)
Differential Revision:	https://reviews.freebsd.org/D23916
This commit is contained in:
Mateusz Guzik 2020-07-25 10:40:38 +00:00
parent e4cdb74faf
commit 9dbd12fb52
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=363523
1 changed files with 11 additions and 9 deletions
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20
sys/kern/vfs_cache.c
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@ -3029,10 +3029,6 @@ cache_can_fplookup(struct cache_fpl *fpl)
cache_fpl_aborted(fpl);
return (false);
}
if ((cnp->cn_flags & LOCKLEAF) == 0) {
cache_fpl_aborted(fpl);
return (false);
}
if (cnp->cn_nameiop != LOOKUP) {
cache_fpl_aborted(fpl);
return (false);
@ -3120,7 +3116,6 @@ cache_fplookup_final(struct cache_fpl *fpl)
tvp_seqc = fpl->tvp_seqc;
VNPASS(cache_fplookup_vnode_supported(dvp), dvp);
MPASS((cnp->cn_flags & LOCKLEAF) != 0);
tvs = vget_prep_smr(tvp);
if (tvs == VGET_NONE) {
@ -3135,13 +3130,20 @@ cache_fplookup_final(struct cache_fpl *fpl)
cache_fpl_smr_exit(fpl);
error = vget_finish(tvp, cnp->cn_lkflags, tvs);
if (error != 0) {
return (cache_fpl_aborted(fpl));
if ((cnp->cn_flags & LOCKLEAF) != 0) {
error = vget_finish(tvp, cnp->cn_lkflags, tvs);
if (error != 0) {
return (cache_fpl_aborted(fpl));
}
} else {
vget_finish_ref(tvp, tvs);
}
if (!vn_seqc_consistent(tvp, tvp_seqc)) {
vput(tvp);
if ((cnp->cn_flags & LOCKLEAF) != 0)
vput(tvp);
else
vrele(tvp);
return (cache_fpl_aborted(fpl));
}