--- xnu/xnu-124.13/bsd/miscfs/devfs/devfs_tree.c
+++ xnu/xnu-517/bsd/miscfs/devfs/devfs_tree.c
@@ -3,19 +3,22 @@
  *
  * @APPLE_LICENSE_HEADER_START@
  * 
- * The contents of this file constitute Original Code as defined in and
- * are subject to the Apple Public Source License Version 1.1 (the
- * "License").  You may not use this file except in compliance with the
- * License.  Please obtain a copy of the License at
- * http://www.apple.com/publicsource and read it before using this file.
+ * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
  * 
- * This Original Code and all software distributed under the License are
- * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ * 
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
- * License for the specific language governing rights and limitations
- * under the License.
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
  * 
  * @APPLE_LICENSE_HEADER_END@
  */
@@ -96,7 +99,7 @@
 
 #ifdef HIDDEN_MOUNTPOINT
 static struct mount *devfs_hidden_mount;
-#endif HIDDEN_MOINTPOINT
+#endif /* HIDDEN_MOINTPOINT */
 
 static int devfs_ready = 0;
 
@@ -126,10 +129,15 @@
 	MALLOC(devfs_hidden_mount, struct mount *, sizeof(struct mount),
 	       M_MOUNT, M_WAITOK);
 	bzero(devfs_hidden_mount,sizeof(struct mount));
+
+    /* Initialize the default IO constraints */
+    mp->mnt_maxreadcnt = mp->mnt_maxwritecnt = MAXPHYS;
+    mp->mnt_segreadcnt = mp->mnt_segwritecnt = 32;
+
 	devfs_mount(devfs_hidden_mount,"dummy",NULL,NULL,NULL);
 	dev_root->de_dnp->dn_dvm 
 	    = (struct devfsmount *)devfs_hidden_mount->mnt_data;
-#endif HIDDEN_MOUNTPOINT
+#endif /* HIDDEN_MOUNTPOINT */
 	devfs_ready = 1;
 	return (0);
 }
@@ -279,7 +287,7 @@
 		return 0;
 	}
 }
-#endif 0
+#endif
 /***********************************************************************\
 * Given a starting node (0 for root) and a pathname, return the node	*
 * for the end item on the path. It MUST BE A DIRECTORY. If the 'CREATE'	*
@@ -330,6 +338,7 @@
 		scan++;
 
 	    strncpy(component, start, scan - start);
+		component[ scan - start ] = '\0';
 	    if (*scan == '/')
 		scan++;
 
@@ -662,14 +671,14 @@
 		if (dnp->dn_vn == NULL) {
 #if 0
 		    printf("devfs_dn_free: free'ing %x\n", (unsigned int)dnp);
-#endif 0
+#endif
 		    devnode_free(dnp); /* no accesses/references */
 		}
 		else {
 #if 0
 		    printf("devfs_dn_free: marking %x for deletion\n",
 			   (unsigned int)dnp);
-#endif 0
+#endif
 		    dnp->dn_delete = TRUE;
 		}
 	}
@@ -740,6 +749,7 @@
 	devnode_t * dnp = ((devdirent_t *)dirent_p)->de_dnp;
 	devnode_t * dnp2;
 	boolean_t   funnel_state;
+	boolean_t   lastlink;
 
 	funnel_state = thread_funnel_set(kernel_flock, TRUE);
 
@@ -760,8 +770,11 @@
 		dnp->dn_nextsibling->dn_prevsiblingp = &(dnp->dn_nextsibling);
 		dnp2->dn_nextsibling = dnp2;
 		dnp2->dn_prevsiblingp = &(dnp2->dn_nextsibling);
-		while(dnp2->dn_linklist) {
-			dev_free_name(dnp2->dn_linklist);
+		if(dnp2->dn_linklist) {
+			do {
+				lastlink = (1 == dnp2->dn_links);
+				dev_free_name(dnp2->dn_linklist);
+			} while (!lastlink);
 		}
 	}
 
@@ -770,8 +783,11 @@
 	 * If we are not running in SPLIT_DEVS mode, then
 	 * THIS is what gets rid of the propogated nodes.
 	 */
-	while(dnp->dn_linklist) {
-		dev_free_name(dnp->dn_linklist);
+	if(dnp->dn_linklist) {
+		do {
+			lastlink = (1 == dnp->dn_links);
+			dev_free_name(dnp->dn_linklist);
+		} while (!lastlink);
 	}
 	DEVFS_UNLOCK(0);
 out:
@@ -1046,8 +1062,6 @@
 	return error;
 }
 
-#include <sys/subr_prf.h>
-
 /*
  * Function: devfs_make_node
  *
@@ -1072,7 +1086,6 @@
 	devnode_type_t	typeinfo;
 
 	char *name, *path, buf[256]; /* XXX */
-	char * b_ptr = buf;
 	boolean_t   funnel_state;
 	int i;
 	va_list ap;
@@ -1088,9 +1101,8 @@
 		goto out;
 
 	va_start(ap, fmt);
-	prf(fmt, ap, TOSTR, (struct tty *)&b_ptr);
+	vsnprintf(buf, sizeof(buf), fmt, ap);
 	va_end(ap);
-	*b_ptr = 0;
 
 	name = NULL;
 
@@ -1147,7 +1159,6 @@
 
 	va_list ap;
 	char *p, buf[256]; /* XXX */
-	char * b_ptr = buf;
 	int i;
 	boolean_t   funnel_state;
 
@@ -1159,9 +1170,8 @@
 	}
 
 	va_start(ap, fmt);
-	prf(fmt, ap, TOSTR, (struct tty *)&b_ptr);
+	vsnprintf(buf, sizeof(buf), fmt, ap);
 	va_end(ap);
-	*b_ptr = 0;
 
 	p = NULL;