Uncut&paste cache_lookup().

This unifies several times in theory indentical 50 lines of code.

The filesystems have a new method: vop_cachedlookup, which is the
meat of the lookup, and use vfs_cache_lookup() for their vop_lookup
method.  vfs_cache_lookup() will check the namecache and pass on
to the vop_cachedlookup method in case of a miss.

It's still the task of the individual filesystems to populate the
namecache with cache_enter().

Filesystems that do not use the namecache will just provide the
vop_lookup method as usual.

1 files changed, 1 insertions, 49 deletions

diff --git a/sys/gnu/fs/ext2fs/ext2_lookup.c b/sys/gnu/fs/ext2fs/ext2_lookup.c
index 6d769f9..431a52b 100644
--- a/sys/gnu/fs/ext2fs/ext2_lookup.c
+++ b/sys/gnu/fs/ext2fs/ext2_lookup.c
@@ -268,7 +268,7 @@ printf("ext2_readdir called uio->uio_offset %d uio->uio_resid %d count %d \n",
  */
 int
 ext2_lookup(ap)
-	struct vop_lookup_args /* {
+	struct vop_cachedlookup_args /* {
 		struct vnode *a_dvp;
 		struct vnode **a_vpp;
 		struct componentname *a_cnp;
@@ -321,55 +321,7 @@ ext2_lookup(ap)
 
 	/*
 	 * We now have a segment name to search for, and a directory to search.
-	 *
-	 * Before tediously performing a linear scan of the directory,
-	 * check the name cache to see if the directory/name pair
-	 * we are looking for is known already.
 	 */
-	if (error = cache_lookup(vdp, vpp, cnp)) {
-		int vpid;	/* capability number of vnode */
-
-		if (error == ENOENT)
-			return (error);
-		/*
-		 * Get the next vnode in the path.
-		 * See comment below starting `Step through' for
-		 * an explaination of the locking protocol.
-		 */
-		pdp = vdp;
-		dp = VTOI(*vpp);
-		vdp = *vpp;
-		vpid = vdp->v_id;
-		if (pdp == vdp) {   /* lookup on "." */
-			VREF(vdp);
-			error = 0;
-		} else if (flags & ISDOTDOT) {
-			VOP_UNLOCK(pdp, 0, p);
-			error = vget(vdp, LK_EXCLUSIVE, p);
-			if (!error && lockparent && (flags & ISLASTCN))
-				error = vn_lock(pdp, LK_EXCLUSIVE, p);
-		} else {
-			error = vget(vdp, LK_EXCLUSIVE, p);
-			if (!lockparent || error || !(flags & ISLASTCN))
-				VOP_UNLOCK(pdp, 0, p);
-		}
-		/*
-		 * Check that the capability number did not change
-		 * while we were waiting for the lock.
-		 */
-		if (!error) {
-			if (vpid == vdp->v_id)
-				return (0);
-			vput(vdp);
-			if (lockparent && pdp != vdp && (flags & ISLASTCN))
-				VOP_UNLOCK(pdp, 0, p);
-		}
-		if (error = vn_lock(pdp, LK_EXCLUSIVE, p))
-			return (error);
-		vdp = pdp;
-		dp = VTOI(pdp);
-		*vpp = NULL;
-	}
 
 	/*
 	 * Suppress search for slots unless creating