This is the kernel Lite/2 commit. There are some requisite userland

changes, so don't expect to be able to run the kernel as-is (very well)
without the appropriate Lite/2 userland changes.

The system boots and can mount UFS filesystems.

Untested: ext2fs, msdosfs, NFS
Known problems: Incorrect Berkeley ID strings in some files.
		Mount_std mounts will not work until the getfsent
		library routine is changed.

Reviewed by:	various people
Submitted by:	Jeffery Hsu <hsu@freebsd.org>

1 files changed, 20 insertions, 41 deletions

diff --git a/sys/fs/nullfs/null_subr.c b/sys/fs/nullfs/null_subr.c
index a14a7e4..4418631 100644
--- a/sys/fs/nullfs/null_subr.c
+++ b/sys/fs/nullfs/null_subr.c
@@ -33,13 +33,14 @@
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	@(#)null_subr.c	8.4 (Berkeley) 1/21/94
+ *	@(#)null_subr.c	8.7 (Berkeley) 5/14/95
  *
  * $FreeBSD$
  */
 
 #include <sys/param.h>
 #include <sys/systm.h>
+#include <sys/proc.h>
 #include <sys/time.h>
 #include <sys/types.h>
 #include <sys/vnode.h>
@@ -48,11 +49,8 @@
 #include <sys/malloc.h>
 #include <miscfs/nullfs/null.h>
 
-extern int	nullfs_init __P((void));
-
 #define LOG2_SIZEVNODE 7		/* log2(sizeof struct vnode) */
 #define	NNULLNODECACHE 16
-#define	NULL_NHASH(vp) ((((u_long)vp)>>LOG2_SIZEVNODE) & (NNULLNODECACHE-1))
 
 /*
  * Null layer cache:
@@ -62,51 +60,32 @@ extern int	nullfs_init __P((void));
  * alias is removed the lower vnode is vrele'd.
  */
 
-/*
- * Cache head
- */
-struct null_node_cache {
-	struct null_node	*ac_forw;
-	struct null_node	*ac_back;
-};
-
-static struct null_node_cache null_node_cache[NNULLNODECACHE];
+#define	NULL_NHASH(vp) \
+	(&null_node_hashtbl[(((u_long)vp)>>LOG2_SIZEVNODE) & null_node_hash])
+LIST_HEAD(null_node_hashhead, null_node) *null_node_hashtbl;
+u_long null_node_hash;
 
 static int	null_node_alloc __P((struct mount *mp, struct vnode *lowervp,
 				     struct vnode **vpp));
 static struct vnode *
 		null_node_find __P((struct mount *mp, struct vnode *lowervp));
-static struct null_node_cache *
-		null_node_hash __P((struct vnode *lowervp));
 
 /*
  * Initialise cache headers
  */
 int
-nullfs_init()
+nullfs_init(vfsp)
+	struct vfsconf *vfsp;
 {
-	struct null_node_cache *ac;
+
 #ifdef NULLFS_DIAGNOSTIC
 	printf("nullfs_init\n");		/* printed during system boot */
 #endif
-
-	for (ac = null_node_cache; ac < null_node_cache + NNULLNODECACHE; ac++)
-		ac->ac_forw = ac->ac_back = (struct null_node *) ac;
+	null_node_hashtbl = hashinit(NNULLNODECACHE, M_CACHE, &null_node_hash);
 	return (0);
 }
 
 /*
- * Compute hash list for given lower vnode
- */
-static struct null_node_cache *
-null_node_hash(lowervp)
-struct vnode *lowervp;
-{
-
-	return (&null_node_cache[NULL_NHASH(lowervp)]);
-}
-
-/*
  * Return a VREF'ed alias for lower vnode if already exists, else 0.
  */
 static struct vnode *
@@ -114,7 +93,8 @@ null_node_find(mp, lowervp)
 	struct mount *mp;
 	struct vnode *lowervp;
 {
-	struct null_node_cache *hd;
+	struct proc *p = curproc;	/* XXX */
+	struct null_node_hashhead *hd;
 	struct null_node *a;
 	struct vnode *vp;
 
@@ -124,9 +104,9 @@ null_node_find(mp, lowervp)
 	 * the lower vnode.  If found, the increment the null_node
 	 * reference count (but NOT the lower vnode's VREF counter).
 	 */
-	hd = null_node_hash(lowervp);
+	hd = NULL_NHASH(lowervp);
 loop:
-	for (a = hd->ac_forw; a != (struct null_node *) hd; a = a->null_forw) {
+	for (a = hd->lh_first; a != 0; a = a->null_hash.le_next) {
 		if (a->null_lowervp == lowervp && NULLTOV(a)->v_mount == mp) {
 			vp = NULLTOV(a);
 			/*
@@ -134,7 +114,7 @@ loop:
 			 * stuff, but we don't want to lock
 			 * the lower node.
 			 */
-			if (vget(vp, 0)) {
+			if (vget(vp, 0, p)) {
 				printf ("null_node_find: vget failed.\n");
 				goto loop;
 			};
@@ -157,7 +137,7 @@ null_node_alloc(mp, lowervp, vpp)
 	struct vnode *lowervp;
 	struct vnode **vpp;
 {
-	struct null_node_cache *hd;
+	struct null_node_hashhead *hd;
 	struct null_node *xp;
 	struct vnode *othervp, *vp;
 	int error;
@@ -194,8 +174,8 @@ null_node_alloc(mp, lowervp, vpp)
 		return 0;
 	};
 	VREF(lowervp);   /* Extra VREF will be vrele'd in null_node_create */
-	hd = null_node_hash(lowervp);
-	insque(xp, hd);
+	hd = NULL_NHASH(lowervp);
+	LIST_INSERT_HEAD(hd, xp, null_hash);
 	return 0;
 }
 
@@ -250,9 +230,8 @@ null_node_create(mp, lowervp, newvpp)
 #ifdef DIAGNOSTIC
 	if (lowervp->v_usecount < 1) {
 		/* Should never happen... */
-		vprint ("null_node_create: alias ",aliasvp);
-		vprint ("null_node_create: lower ",lowervp);
-		printf ("null_node_create: lower has 0 usecount.\n");
+		vprint ("null_node_create: alias ", aliasvp);
+		vprint ("null_node_create: lower ", lowervp);
 		panic ("null_node_create: lower has 0 usecount.");
 	};
 #endif