MFC r309893,r309929:

    vfs: add vrefact, to be used when the vnode has to be already active

    This allows blind increment of relevant counters which under contention
    is cheaper than inc-not-zero loops at least on amd64.

    Use it in some of the places which are guaranteed to see already active
    vnodes.

==

    vfs: use vrefact in getcwd and fchdir

1 files changed, 4 insertions, 4 deletions

diff --git a/sys/kern/vfs_lookup.c b/sys/kern/vfs_lookup.c
index 85c625f..c1ad31e 100644
--- a/sys/kern/vfs_lookup.c
+++ b/sys/kern/vfs_lookup.c
@@ -200,7 +200,7 @@ namei_handle_root(struct nameidata *ndp, struct vnode **dpp)
 		ndp->ni_pathlen--;
 	}
 	*dpp = ndp->ni_rootdir;
-	VREF(*dpp);
+	vrefact(*dpp);
 	return (0);
 }
 
@@ -321,7 +321,7 @@ namei(struct nameidata *ndp)
 	 */
 	FILEDESC_SLOCK(fdp);
 	ndp->ni_rootdir = fdp->fd_rdir;
-	VREF(ndp->ni_rootdir);
+	vrefact(ndp->ni_rootdir);
 	ndp->ni_topdir = fdp->fd_jdir;
 
 	/*
@@ -343,7 +343,7 @@ namei(struct nameidata *ndp)
 			startdir_used = 1;
 		} else if (ndp->ni_dirfd == AT_FDCWD) {
 			dp = fdp->fd_cdir;
-			VREF(dp);
+			vrefact(dp);
 		} else {
 			rights = ndp->ni_rightsneeded;
 			cap_rights_set(&rights, CAP_LOOKUP);
@@ -910,7 +910,7 @@ good:
 			vput(ndp->ni_dvp);
 		else
 			vrele(ndp->ni_dvp);
-		vref(vp_crossmp);
+		vrefact(vp_crossmp);
 		ndp->ni_dvp = vp_crossmp;
 		error = VFS_ROOT(mp, compute_cn_lkflags(mp, cnp->cn_lkflags,
 		    cnp->cn_flags), &tdp);