Date: Mon, 24 Aug 2020 08:55:56 +0000 (UTC) From: Mateusz Guzik <mjg@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r364632 - head/sys/kern Message-ID: <202008240855.07O8tup1090590@repo.freebsd.org>
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Author: mjg Date: Mon Aug 24 08:55:55 2020 New Revision: 364632 URL: https://svnweb.freebsd.org/changeset/base/364632 Log: cache: perform reverse lookup using v_cache_dd if possible Tested by: pho Modified: head/sys/kern/vfs_cache.c Modified: head/sys/kern/vfs_cache.c ============================================================================== --- head/sys/kern/vfs_cache.c Mon Aug 24 08:55:04 2020 (r364631) +++ head/sys/kern/vfs_cache.c Mon Aug 24 08:55:55 2020 (r364632) @@ -2572,6 +2572,19 @@ vn_fullpath_global(struct thread *td, struct vnode *vn return (error); } +static struct namecache * +vn_dd_from_dst(struct vnode *vp) +{ + struct namecache *ncp; + + cache_assert_vnode_locked(vp); + TAILQ_FOREACH(ncp, &vp->v_cache_dst, nc_dst) { + if ((ncp->nc_flag & NCF_ISDOTDOT) == 0) + return (ncp); + } + return (NULL); +} + int vn_vptocnp(struct vnode **vp, struct ucred *cred, char *buf, size_t *buflen) { @@ -2582,9 +2595,13 @@ vn_vptocnp(struct vnode **vp, struct ucred *cred, char vlp = VP2VNODELOCK(*vp); mtx_lock(vlp); - TAILQ_FOREACH(ncp, &((*vp)->v_cache_dst), nc_dst) { - if ((ncp->nc_flag & NCF_ISDOTDOT) == 0) - break; + ncp = (*vp)->v_cache_dd; + if (ncp != NULL && (ncp->nc_flag & NCF_ISDOTDOT) == 0) { + KASSERT(ncp == vn_dd_from_dst(*vp), + ("%s: mismatch for dd entry (%p != %p)", __func__, + ncp, vn_dd_from_dst(*vp))); + } else { + ncp = vn_dd_from_dst(*vp); } if (ncp != NULL) { if (*buflen < ncp->nc_nlen) {
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