From: Ben Gras <ben@minix3.org>
Date: Mon, 22 Jan 2007 15:25:41 +0000 (+0000)
Subject: vfs/mount/rs/service changes:
X-Git-Tag: v3.1.3~106
X-Git-Url: http://zhaoyanbai.com/repos/?a=commitdiff_plain;h=2194bc03102f9098d818ae7538abd0762dc58f70;p=minix.git

vfs/mount/rs/service changes:
 . changed umount() and mount() to call 'service', so that it can include
   a custom label, so that umount() works again (RS slot gets freed now).
   merged umount() and mount() into one file to encode keep this label
   knowledge in one file.
 . removed obsolete RS_PID field and RS_RESCUE rescue command
 . added label to RS_START struct
 . vfs no longer does kill of fs process on unmount (which was failing
   due to RS_PID request not working)
 . don't assume that if error wasn't one of three errors, that no error
   occured in vfs/request.c
mfs changes:
 . added checks to copy statements to truncate copies at buffer sizes
   (left in debug code for now)
 . added checks for null-terminatedness, if less than NAME_MAX was copied
 . added checks for copy function success
is changes:
 . dump rs label
drivers.conf changes:
 . added acl for mfs so that mfs can be started with 'service start',
   so that a custom label can be provided
---

diff --git a/docs/UPDATING b/docs/UPDATING
index 0aaebd5be..19920b5ee 100644
--- a/docs/UPDATING
+++ b/docs/UPDATING
@@ -31,3 +31,6 @@
 	in /etc/make.conf, included by some Makefiles and sourced by
 	some shell scripts. To install it, type 'make install' in
 	src/etc, or simply copy the file over.
+20070118:
+	drivers.conf has been updated to include an ACL for mfs. it has
+	to be installed before rebooting after an update of the mount command.
diff --git a/etc/drivers.conf b/etc/drivers.conf
index 978d462db..176b0c07f 100644
--- a/etc/drivers.conf
+++ b/etc/drivers.conf
@@ -142,3 +142,16 @@ driver at_wini
 		1/1		# Mass storage / IDE
 	;
 };
+
+driver mfs
+{
+	system
+		EXIT		#  2
+		VIRCOPY		# 15
+		TIMES		# 25
+		SAFECOPYFROM	# 31
+		SAFECOPYTO	# 32
+		SETGRANT	# 34
+		;
+	uid	0;
+};
diff --git a/include/minix/com.h b/include/minix/com.h
index b206bd22c..819248e7b 100755
--- a/include/minix/com.h
+++ b/include/minix/com.h
@@ -555,7 +555,6 @@
 #define RS_DOWN		(RS_RQ_BASE + 1)	/* stop system service */
 #define RS_REFRESH	(RS_RQ_BASE + 2)	/* refresh system service */
 #define RS_RESTART	(RS_RQ_BASE + 3)	/* restart system service */
-#define RS_RESCUE	(RS_RQ_BASE + 4)	/* set rescue directory */
 #define RS_SHUTDOWN	(RS_RQ_BASE + 5)	/* alert about shutdown */
 #define RS_UP_COPY	(RS_RQ_BASE + 6)	/* start system service and
 						 * keep the binary in memory
@@ -567,7 +566,6 @@
 
 #  define RS_CMD_ADDR		m1_p1		/* command string */
 #  define RS_CMD_LEN		m1_i1		/* length of command */
-#  define RS_PID		m1_i1		/* pid of system service */
 #  define RS_PERIOD 	        m1_i2		/* heartbeat period */
 #  define RS_DEV_MAJOR          m1_i3           /* major device number */
 
diff --git a/include/minix/paths.h b/include/minix/paths.h
index c35b7daeb..8ec598948 100644
--- a/include/minix/paths.h
+++ b/include/minix/paths.h
@@ -17,5 +17,7 @@
 #define    _PATH_TMP       "/tmp"
 
 #define _PATH_BSHELL	"/bin/sh"
+#define _PATH_SERVICE	"/bin/service"
+#define _PATH_DRIVERS_CONF	"/etc/drivers.conf"
 
 #endif
diff --git a/include/minix/rs.h b/include/minix/rs.h
index 371d871a5..a2c19da00 100644
--- a/include/minix/rs.h
+++ b/include/minix/rs.h
@@ -31,6 +31,8 @@ struct rs_start
 	int rss_nr_pci_class;
 	struct { u32_t class; u32_t mask; } rss_pci_class[RSS_NR_PCI_CLASS];
 	u32_t rss_system[RSS_NR_SYSTEM];
+	char *rss_label;
+	size_t rss_labellen;
 };
 
 #define RF_COPY		0x01	/* Copy the brinary into RS to make it possible
@@ -51,3 +53,4 @@ struct rs_pci
 	int rsp_nr_class;
 	struct { u32_t class; u32_t mask; } rsp_class[RSP_NR_CLASS];
 };
+
diff --git a/lib/posix/Makefile.in b/lib/posix/Makefile.in
index b3eec7cc5..21c313f12 100644
--- a/lib/posix/Makefile.in
+++ b/lib/posix/Makefile.in
@@ -92,7 +92,6 @@ libc_FILES=" \
 	_times.c \
 	_truncate.c \
 	_umask.c \
-	_umount.c \
 	_uname.c \
 	_unlink.c \
 	_utime.c \
diff --git a/lib/posix/_mount.c b/lib/posix/_mount.c
index e7dc63134..5d38b471e 100755
--- a/lib/posix/_mount.c
+++ b/lib/posix/_mount.c
@@ -1,49 +1,123 @@
 
 #include <lib.h>
 #define mount	_mount
+#define umount	_umount
 #include <string.h>
 #include <unistd.h>
+#include <stdlib.h>
 #include <stdio.h>
 #include <sys/stat.h>
 #include <minix/syslib.h>
-
+#include <minix/rs.h>
+#include <minix/paths.h>
 #define OK	0
 
+#define MFSNAME "mfs"
+#define MFSPATH "/sbin/"
+
+PRIVATE int rs_down(char *label)
+{
+	char cmd[200];
+	message m;
+	if(strlen(_PATH_SERVICE)+strlen(label)+50 >= sizeof(cmd))
+		return -1;
+	sprintf(cmd, _PATH_SERVICE " down %s", label);
+	return system(cmd);
+}
+
+PRIVATE char *makelabel(_CONST char *special)
+{
+  static char label[40];
+  _CONST char *dev;
+
+  /* Make label name. */
+  dev = strrchr(special, '/');
+  if(dev) dev++;
+  else dev = special;
+  if(strlen(dev)+strlen(MFSNAME)+3 >= sizeof(label))
+	return NULL;
+  sprintf(label, MFSNAME "_%s", dev);
+  return label;
+}
+
 PUBLIC int mount(special, name, rwflag)
 char *name, *special;
 int rwflag;
 {
   int r;
-  struct stat stat_buf;
   message m;
-  
-  m.RS_CMD_ADDR = "/sbin/mfs";
-  if (stat(m.RS_CMD_ADDR, &stat_buf) == -1) {
-	/* /sbin/mfs does not exist, try /bin/mfs as well */
-	m.RS_CMD_ADDR = "/bin/mfs";
-	if (stat(m.RS_CMD_ADDR, &stat_buf) == -1) {
-		/* /bin/mfs does not exist either, give up */
-		return -1;
-	  }
-  } 
-  
-  if (m.RS_CMD_ADDR) {
-	m.RS_CMD_LEN = strlen(m.RS_CMD_ADDR);
-	m.RS_DEV_MAJOR = 0;
-	m.RS_PERIOD = 0;
-	r= _taskcall(RS_PROC_NR, RS_UP, &m);
-	if (r != OK) {
-		errno= -r;
-		return -1;
-	} 
-	/* copy endpointnumber */
-	m.m1_p3 = (char*)(unsigned long)m.RS_ENDPOINT;   
+  struct rs_start rs_start;
+  char *label;
+  char cmd[200];
+  FILE *pipe;
+  int ep;
+
+  /* Make MFS process label for RS from special name. */
+  if(!(label=makelabel(special))) {
+	errno = E2BIG;
+	return -1;
+  }
+
+  if(strlen(_PATH_SERVICE)+strlen(MFSPATH)+strlen(MFSNAME)+
+     strlen(label)+50 >= sizeof(cmd)) {
+	errno = E2BIG;
+	return -1;
   }
+
+  sprintf(cmd, _PATH_SERVICE " up " MFSPATH MFSNAME 
+	" -label \"%s\" -config " _PATH_DRIVERS_CONF " -printep yes",
+	label);
+
+  if(!(pipe = popen(cmd, "r"))) {
+	fprintf(stderr, "mount: couldn't run %s\n", cmd);
+	return -1;
+  }
+  if(fscanf(pipe, "%d", &ep) != 1 || ep <= 0) {
+	fprintf(stderr, "mount: couldn't parse endpoint from %s\n", cmd);
+	errno = EINVAL;
+	pclose(pipe);
+	return -1;
+  }
+  pclose(pipe);
   
+  /* Now perform mount(). */
   m.m1_i1 = strlen(special) + 1;
   m.m1_i2 = strlen(name) + 1;
   m.m1_i3 = rwflag;
   m.m1_p1 = special;
   m.m1_p2 = name;
-  return(_syscall(FS, MOUNT, &m));
+  m.m1_p3 = (char*) ep;
+  r = _syscall(FS, MOUNT, &m);
+
+  if(r != OK) {
+	/* If mount() failed, tell RS to shutdown MFS process.
+	 * No error check - won't do anything with this error anyway.
+	 */
+	rs_down(label);
+  }
+
+  return r;
+}
+
+PUBLIC int umount(name)
+_CONST char *name;
+{
+  message m;
+  char *label;
+  int r;
+
+  /* Make MFS process label for RS from special name. */
+  if(!(label=makelabel(name))) {
+	errno = E2BIG;
+	return -1;
+  }
+
+  _loadname(name, &m);
+  r = _syscall(FS, UMOUNT, &m);
+
+  if(r == OK) {
+	rs_down(label);
+  }
+
+  return r;
 }
diff --git a/lib/posix/_umount.c b/lib/posix/_umount.c
deleted file mode 100755
index 71e712544..000000000
--- a/lib/posix/_umount.c
+++ /dev/null
@@ -1,12 +0,0 @@
-#include <lib.h>
-#define umount	_umount
-#include <unistd.h>
-
-PUBLIC int umount(name)
-_CONST char *name;
-{
-  message m;
-
-  _loadname(name, &m);
-  return(_syscall(FS, UMOUNT, &m));
-}
diff --git a/servers/is/dmp_rs.c b/servers/is/dmp_rs.c
index beec021fa..3602beadb 100644
--- a/servers/is/dmp_rs.c
+++ b/servers/is/dmp_rs.c
@@ -28,20 +28,20 @@ PUBLIC void rproc_dmp()
   getsysinfo(RS_PROC_NR, SI_PROC_TAB, rproc);
 
   printf("Reincarnation Server (RS) system process table dump\n");
-  printf("-----proc---pid-flag--dev- -T---checked----alive-starts-backoff-command (argc)-\n");
+  printf("-----proc---pid-flag--dev- -T---checked----alive-starts-backoff-label command-\n");
   for (i=prev_i; i<NR_SYS_PROCS; i++) {
   	rp = &rproc[i];
   	if (! rp->r_flags & RS_IN_USE) continue;
   	if (++n > 22) break;
-  	printf("%9d %5d %s %3d/%2d %3u %8u %8u %4dx %3d %s (%d)",
-  		rp->r_proc_nr_e, rp->r_pid, 
+  	printf("%9d %s %3d/%2d %3u %8u %8u %4dx %3d %s %s",
+  		rp->r_proc_nr_e,
 		s_flags_str(rp->r_flags),
   		rp->r_dev_nr, rp->r_dev_style,
 		rp->r_period, 
 		rp->r_check_tm, rp->r_alive_tm,
 		rp->r_restarts, rp->r_backoff,
-		rp->r_cmd,
-		rp->r_argc
+		rp->r_label,
+		rp->r_cmd
   	);
 	printf("\n");
   }
diff --git a/servers/mfs/const.h b/servers/mfs/const.h
index 2fed5b48f..9f5027523 100644
--- a/servers/mfs/const.h
+++ b/servers/mfs/const.h
@@ -108,3 +108,4 @@
 #define V2_INODES_PER_BLOCK(b) ((b)/V2_INODE_SIZE)/* # V2 dsk inodes/blk */
 
 #define MFS_MIN(a,b) mfs_min_f(__FILE__,__LINE__,(a), (b))
+#define MFS_NUL(str,l,m) mfs_nul_f(__FILE__,__LINE__,(str), (l), (m))
diff --git a/servers/mfs/link.c b/servers/mfs/link.c
index 141d94ba1..0e76712b5 100644
--- a/servers/mfs/link.c
+++ b/servers/mfs/link.c
@@ -38,14 +38,17 @@ PUBLIC int fs_link()
   register int r;
   char string[NAME_MAX];
   struct inode *new_ip;
+  phys_bytes len;
 
   caller_uid = fs_m_in.REQ_UID;
   caller_gid = fs_m_in.REQ_GID;
   
+  len = MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(string));
   /* Copy the link name's last component */
   r = sys_datacopy(FS_PROC_NR, (vir_bytes) fs_m_in.REQ_PATH,
-          SELF, (vir_bytes) string, 
-          (phys_bytes) MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(string)));
+          SELF, (vir_bytes) string, (phys_bytes) len);
+  if (r != OK) return r;
+  MFS_NUL(string, len, sizeof(string));
   
   /* Temporarily open the file. */
   if ( (rip = get_inode(fs_dev, fs_m_in.REQ_LINKED_FILE)) == NIL_INODE) {
@@ -117,16 +120,17 @@ PUBLIC int fs_unlink()
   struct inode *rldirp;
   int r;
   char string[NAME_MAX];
+  phys_bytes len;
   
   caller_uid = fs_m_in.REQ_UID;
   caller_gid = fs_m_in.REQ_GID;
   
   /* Copy the last component */
+  len = MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(string));
   r = sys_datacopy(FS_PROC_NR, (vir_bytes) fs_m_in.REQ_PATH,
-          SELF, (vir_bytes) string, 
-          (phys_bytes) MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(string)));
-
+          SELF, (vir_bytes) string, (phys_bytes) len);
   if (r != OK) return r;
+  MFS_NUL(string, len, sizeof(string));
   
   /* Temporarily open the dir. */
   if ( (rldirp = get_inode(fs_dev, fs_m_in.REQ_INODE_NR)) == NIL_INODE) {
@@ -297,22 +301,25 @@ PUBLIC int fs_rename()
   int same_pdir;			/* TRUE iff parent dirs are the same */
   char old_name[NAME_MAX], new_name[NAME_MAX];
   ino_t numb;
+  phys_bytes len;
   int r1;
   
   caller_uid = fs_m_in.REQ_UID;
   caller_gid = fs_m_in.REQ_GID;
   
   /* Copy the last component of the old name */
+  len = MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(old_name));
   r = sys_datacopy(FS_PROC_NR, (vir_bytes) fs_m_in.REQ_PATH,
-          SELF, (vir_bytes) old_name, 
-          (phys_bytes) MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(old_name)));
+          SELF, (vir_bytes) old_name, (phys_bytes) len);
   if (r != OK) return r;
+  MFS_NUL(old_name, len, sizeof(old_name));
   
   /* Copy the last component of the new name */
+  len = MFS_MIN(fs_m_in.REQ_SLENGTH, sizeof(new_name));
   r = sys_datacopy(FS_PROC_NR, (vir_bytes) fs_m_in.REQ_USER_ADDR,
-          SELF, (vir_bytes) new_name, 
-          (phys_bytes) fs_m_in.REQ_SLENGTH);
+          SELF, (vir_bytes) new_name, (phys_bytes) len);
   if (r != OK) return r;
+  MFS_NUL(new_name, len, sizeof(new_name));
 
   /* Get old dir inode */ 
   if ( (old_dirp = get_inode(fs_dev, fs_m_in.REQ_OLD_DIR)) == NIL_INODE) 
diff --git a/servers/mfs/mount.c b/servers/mfs/mount.c
index c75fdc9a6..b777dfa1d 100644
--- a/servers/mfs/mount.c
+++ b/servers/mfs/mount.c
@@ -185,7 +185,6 @@ PUBLIC int fs_unmount()
   sp->s_dev = NO_DEV;
   
 
-printf("MFS(%d) DEV %d unmounted\n", SELF_E, fs_dev);  
   return OK;
 }
 
diff --git a/servers/mfs/open.c b/servers/mfs/open.c
index a45d94c34..b2889e21d 100644
--- a/servers/mfs/open.c
+++ b/servers/mfs/open.c
@@ -48,13 +48,13 @@ PUBLIC int fs_open()
 
   /* If O_CREATE is set, try to make the file. */ 
   if (oflags & O_CREAT) {
+	  phys_bytes len;
 	  /* Copy the last component */
+	  len = MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(lastc));
 	  err_code = sys_datacopy(FS_PROC_NR, (vir_bytes) fs_m_in.REQ_PATH, 
-		  SELF, (vir_bytes) lastc,
-			(phys_bytes) MFS_MIN(fs_m_in.REQ_PATH_LEN,
-				sizeof(lastc)));
-
+		  SELF, (vir_bytes) lastc, (phys_bytes) len);
 	  if (err_code != OK) return err_code;
+ 	  MFS_NUL(lastc, len, sizeof(lastc));
 
 	  /* Get last directory inode */
 	  if ((ldirp = get_inode(fs_dev, fs_m_in.REQ_INODE_NR)) == NIL_INODE) {
@@ -150,6 +150,7 @@ printf("MFS(%d) get_inode by open() failed\n", SELF_E);
  *===========================================================================*/
 PUBLIC int fs_create()
 {
+  phys_bytes len;
   int r, b;
   struct inode *ldirp;
   struct inode *rip;
@@ -165,10 +166,11 @@ PUBLIC int fs_create()
   /* Try to make the file. */ 
 
   /* Copy the last component */
+  len = MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(lastc));
   err_code = sys_datacopy(FS_PROC_NR, (vir_bytes) fs_m_in.REQ_PATH, 
-	SELF, (vir_bytes) lastc, (phys_bytes) MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(lastc)));
-
+	SELF, (vir_bytes) lastc, (phys_bytes) len);
   if (err_code != OK) return err_code;
+  MFS_NUL(lastc, len, sizeof(lastc));
 
   /* Get last directory inode */
   if ((ldirp = get_inode(fs_dev, fs_m_in.REQ_INODE_NR)) == NIL_INODE) {
@@ -212,13 +214,14 @@ PUBLIC int fs_mknod()
 {
   struct inode *ip, *ldirp;
   char lastc[NAME_MAX];
+  phys_bytes len;
 
   /* Copy the last component and set up caller's user and group id */
+  len = MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(lastc));
   err_code = sys_datacopy(FS_PROC_NR, (vir_bytes) fs_m_in.REQ_PATH, SELF, 
-            (vir_bytes) lastc,
-	    (phys_bytes) MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(lastc)));
-
+            (vir_bytes) lastc, (phys_bytes) len);
   if (err_code != OK) return err_code;
+  MFS_NUL(lastc, len, sizeof(lastc));
   
   caller_uid = fs_m_in.REQ_UID;
   caller_gid = fs_m_in.REQ_GID;
@@ -247,13 +250,14 @@ PUBLIC int fs_mkdir()
   ino_t dot, dotdot;		/* inode numbers for . and .. */
   struct inode *rip, *ldirp;
   char lastc[NAME_MAX];         /* last component */
+  phys_bytes len;
 
   /* Copy the last component and set up caller's user and group id */
+  len = MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(lastc));
   err_code = sys_datacopy(FS_PROC_NR, (vir_bytes) fs_m_in.REQ_PATH, SELF, 
-            (vir_bytes) lastc, (phys_bytes) 
-	    MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(lastc)));
-
+            (vir_bytes) lastc, (phys_bytes) len);
   if (err_code != OK) return err_code;
+  MFS_NUL(lastc, len, sizeof(lastc));
   
   caller_uid = fs_m_in.REQ_UID;
   caller_gid = fs_m_in.REQ_GID;
@@ -309,6 +313,7 @@ printf("MFS(%d) get_inode for parent dir by mkdir() failed\n", SELF_E);
  *===========================================================================*/
 PUBLIC int fs_slink()
 {
+  phys_bytes len;
   struct inode *sip;           /* inode containing symbolic link */
   struct inode *ldirp;         /* directory containing link */
   register int r;              /* error code */
@@ -324,11 +329,11 @@ PUBLIC int fs_slink()
   }
   
   /* Copy the link name's last component */
+  len = MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(string));
   r = sys_datacopy(FS_PROC_NR, (vir_bytes) fs_m_in.REQ_PATH,
-          SELF, (vir_bytes) string, 
-          (phys_bytes) MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(string)));
-  
+          SELF, (vir_bytes) string, (phys_bytes) len);
   if (r != OK) return r;
+  MFS_NUL(string, len, sizeof(string));
   
   /* Create the inode for the symlink. */
   sip = new_node(ldirp, string, (mode_t) (I_SYMBOLIC_LINK | RWX_MODES),
diff --git a/servers/mfs/path.c b/servers/mfs/path.c
index 04e4e6104..e5459c3cf 100644
--- a/servers/mfs/path.c
+++ b/servers/mfs/path.c
@@ -26,7 +26,7 @@ PUBLIC char dot2[3] = "..";	/* permissions for . and ..		    */
 
 FORWARD _PROTOTYPE( char *get_name, (char *old_name, char string [NAME_MAX]) );
 FORWARD _PROTOTYPE( int ltraverse, (struct inode *rip, char *path, 
-                    char *suffix)                                           );
+                    char *suffix, int pathlen)                         );
 
 
 /*===========================================================================*
@@ -37,15 +37,26 @@ PUBLIC int lookup()
   char string[PATH_MAX];
   struct inode *rip;
   int s_error, flags;
+  int len;
 
   string[0] = '\0';
   
+  /* Check length. */
+  len = fs_m_in.REQ_PATH_LEN;
+  if(len > sizeof(string)) return E2BIG;	/* too big for buffer */
+  if(len < 1) return EINVAL;			/* too small for \0 */
+
   /* Copy the pathname and set up caller's user and group id */
   err_code = sys_datacopy(FS_PROC_NR, (vir_bytes) fs_m_in.REQ_PATH, SELF, 
-            (vir_bytes) user_path,
-	(phys_bytes) MFS_MIN(fs_m_in.REQ_PATH_LEN, sizeof(string)));
+            (vir_bytes) user_path, (phys_bytes) len);
+  if (err_code != OK) {
+	printf("mfs:%s:%d: sys_datacopy failed: %d\n", __FILE__, __LINE__, err_code);
+	return err_code;
+  }
 
-  if (err_code != OK) return err_code;
+  /* Verify this is a null-terminated path. */
+  if(user_path[len-1] != '\0')
+	return EINVAL;
 
   caller_uid = fs_m_in.REQ_UID;
   caller_gid = fs_m_in.REQ_GID;
@@ -60,9 +71,12 @@ PUBLIC int lookup()
   /* Copy back the last name if it is required */
   if (err_code != OK || (flags & PATH_PENULTIMATE)) {
       	s_error = sys_datacopy(SELF_E, (vir_bytes) string, FS_PROC_NR, 
-              (vir_bytes) fs_m_in.REQ_USER_ADDR, (phys_bytes) 
-              MFS_MIN(strlen(string)+1, NAME_MAX));
-      if (s_error != OK) return s_error;
+              (vir_bytes) fs_m_in.REQ_USER_ADDR, (phys_bytes) NAME_MAX);
+      if (s_error != OK) {
+	printf("mfs:%s:%d: sys_datacopy failed: %d\n",
+		__FILE__, __LINE__, s_error);
+	return s_error;
+      }
   }
 
   /* Error or mount point encountered */
@@ -234,7 +248,8 @@ printf("%s, %d\n", __FILE__, __LINE__);
                        if (*new_name != '\0') new_name--;
 
                        /* Extract path name from the symlink file */
-                       if (ltraverse(rip, user_path, new_name) != OK) {
+                       if (ltraverse(rip, user_path, new_name,
+			sizeof(user_path)) != OK) {
                            put_inode(dir_ip);
                            err_code = ENOENT;
 printf("%s, %d\n", __FILE__, __LINE__);
@@ -290,10 +305,11 @@ printf("%s, %d\n", __FILE__, __LINE__);
 /*===========================================================================*
  *                             ltraverse				     *
  *===========================================================================*/
-PRIVATE int ltraverse(rip, path, suffix)
+PRIVATE int ltraverse(rip, path, suffix, pathlen)
 register struct inode *rip;    /* symbolic link */
 char *path;                    /* path containing link */
 char *suffix;                  /* suffix following link within path */
+int pathlen;
 {
 /* Traverse a symbolic link. Copy the link text from the inode and insert
  * the text into the path. Return error code or report success. Base 
@@ -318,18 +334,25 @@ char *suffix;                  /* suffix following link within path */
        /* Insert symbolic text into path name. */
        tl = strlen(suffix);
        if (sl > 0 && sl + tl <= PATH_MAX-1) {
+	   if(sl+tl >= pathlen)
+		panic(__FILE__,"path too small for symlink", sl+tl);
            memmove(path+sl, suffix, tl);
            memmove(path, sp, sl);
            path[sl+tl] = 0;
            
-           /* Copy back to VFS layer   THIS SHOULD BE IN parse_path */
+           /* Copy back to VFS layer   THIS SHOULD BE IN parse_path.
+	    * sys_datacopy() error, if any, gets returned as r later.
+	    */
            r = sys_datacopy(SELF_E, (vir_bytes) path, FS_PROC_NR, 
                    (vir_bytes) vfs_slink_storage, (phys_bytes) sl+tl+1);
-           
            /*
            dup_inode(bip = path[0] == '/' ? chroot_dir : ldip);
            */
-       }
+	   if(r != OK) {
+		printf("mfs:%s:%d: sys_datacopy failed: %d\n",
+			__FILE__, __LINE__, r);
+	   }
+       } else panic(__FILE__,"didn't copy symlink", sl+tl);
   }
   else {
        r = ENOENT;
diff --git a/servers/mfs/proto.h b/servers/mfs/proto.h
index e83f36d39..8b3bbca80 100644
--- a/servers/mfs/proto.h
+++ b/servers/mfs/proto.h
@@ -182,6 +182,8 @@ _PROTOTYPE( int fetch_name, (char *path, int len, int flag)		);
 _PROTOTYPE( int no_sys, (void)						);
 _PROTOTYPE( int isokendpt_f, (char *f, int l, int e, int *p, int ft));
 _PROTOTYPE( void panic, (char *who, char *mess, int num)		);
+_PROTOTYPE( void mfs_nul_f, (char *file, int line, char *str, int len, int maxlen));
+_PROTOTYPE( int mfs_min_f, (char *file, int line, int len1, int len2)	);
 
 #define okendpt(e, p) isokendpt_f(__FILE__, __LINE__, (e), (p), 1)
 #define isokendpt(e, p) isokendpt_f(__FILE__, __LINE__, (e), (p), 0)
diff --git a/servers/mfs/utility.c b/servers/mfs/utility.c
index 387d877ab..328844d69 100644
--- a/servers/mfs/utility.c
+++ b/servers/mfs/utility.c
@@ -92,8 +92,26 @@ PUBLIC time_t clock_time()
 
 int mfs_min_f(char *file, int line, int v1, int v2)
 {
+	if(v1 < 0 || v2 < 0) {
+		printf("mfs:%s:%d: strange string lengths: %d, %d\n",
+			file, line, v1, v2);
+		panic(file, "strange string lengths", NO_NUM);
+	}
 	if(v2 >= v1) return v1;
 	printf("mfs:%s:%d: truncated %d to %d\n",
 		file, line, v1, v2);
 	return v2;
 }
+
+void mfs_nul_f(char *file, int line, char *str, int len, int maxlen)
+{
+	if(len < 1) {
+		printf("mfs:%s:%d: %d-length string?!\n", file, line, len);
+		panic(file, "strange string length", NO_NUM);
+	}
+	if(len < maxlen && str[len-1] != '\0') {
+		printf("mfs:%s:%d: string (length %d, maxlen %d) "
+			"not null-terminated\n",
+			file, line, len, maxlen);
+	}
+}
diff --git a/servers/rs/Makefile b/servers/rs/Makefile
index b5c8ca7d4..407dd79ec 100644
--- a/servers/rs/Makefile
+++ b/servers/rs/Makefile
@@ -16,8 +16,7 @@ CC =	exec cc
 CPPFLAGS = -I../../kernel/arch/$(ARCH)/include
 CFLAGS = -I$i $(CPROFILE) $(CPPFLAGS)
 LDFLAGS = -i
-UTIL_LIBS = -lsysutil  -lsys 
-LIBS = -lsysutil -lsys
+LIBS = -lsys -lsysutil 
 
 UTIL_OBJ = service.o
 OBJ = exec.o main.o manager.o 
diff --git a/servers/rs/main.c b/servers/rs/main.c
index dec432bdc..4e805098d 100644
--- a/servers/rs/main.c
+++ b/servers/rs/main.c
@@ -86,7 +86,6 @@ PUBLIC int main(void)
 	  case RS_START:	result = do_start(&m);		break;
           case RS_DOWN: 	result = do_down(&m); 		break;
           case RS_REFRESH: 	result = do_refresh(&m); 	break;
-          case RS_RESCUE: 	result = do_rescue(&m); 	break;
           case RS_RESTART: 	result = do_restart(&m); 	break;
           case RS_SHUTDOWN: 	result = do_shutdown(&m); 	break;
           case GETSYSINFO: 	result = do_getsysinfo(&m); 	break;
diff --git a/servers/rs/manager.c b/servers/rs/manager.c
index aafef4ee3..1c26d2877 100644
--- a/servers/rs/manager.c
+++ b/servers/rs/manager.c
@@ -106,7 +106,7 @@ int flags;					/* extra flags, if any */
 	len= MAX_LABEL_LEN-1;	/* truncate name */
   memcpy(rp->r_label, label, len);
   rp->r_label[len]= '\0';
-  printf("using label '%s'\n", rp->r_label);
+  printf("RS: do_up: using label '%s'\n", rp->r_label);
 
   rp->r_uid= 0;
   rp->r_nice= 0;
@@ -197,18 +197,31 @@ message *m_ptr;					/* request message pointer */
   rp->r_argv[arg_count] = NULL;			/* end with NULL pointer */
   rp->r_argc = arg_count;
 
-  /* Default label for the driver */
-  label= strrchr(rp->r_argv[0], '/');
-  if (label)
-	label++;
-  else
-	label= rp->r_argv[0];
-  len= strlen(label);
-  if (len > MAX_LABEL_LEN-1)
-	len= MAX_LABEL_LEN-1;	/* truncate name */
-  memcpy(rp->r_label, label, len);
-  rp->r_label[len]= '\0';
-  printf("using label '%s'\n", rp->r_label);
+  if(rs_start.rss_label) {
+	int len;
+	/* RS_START caller has supplied a custom label for this driver. */
+	len = MIN(sizeof(rp->r_label)-1, rs_start.rss_labellen);
+        s=sys_datacopy(m_ptr->m_source, (vir_bytes) rs_start.rss_label,
+        	SELF, (vir_bytes) rp->r_label, len);
+	if(s != OK)
+		return s;
+	rp->r_label[len] = '\0';
+        printf("RS: do_start: using label (custom) '%s'\n", rp->r_label);
+  } else {
+	/* Default label for the driver. */
+	label= strrchr(rp->r_argv[0], '/');
+	if (label)
+		label++;
+	else
+		label= rp->r_argv[0];
+  	len= strlen(label);
+  	if (len > MAX_LABEL_LEN-1)
+		len= MAX_LABEL_LEN-1;	/* truncate name */
+  	memcpy(rp->r_label, label, len);
+  	rp->r_label[len]= '\0';
+        printf("RS: do_start: using label (from binary %s) '%s'\n",
+		rp->r_argv[0], rp->r_label);
+  }
 
   /* Check for duplicates */
   for (slot_nr = 0; slot_nr < NR_SYS_PROCS; slot_nr++) {
@@ -455,31 +468,6 @@ PUBLIC int do_refresh(message *m_ptr)
   return(ESRCH);
 }
 
-/*===========================================================================*
- *				do_rescue				     *
- *===========================================================================*/
-PUBLIC int do_rescue(message *m_ptr)
-{
-  char rescue_dir[MAX_RESCUE_DIR_LEN];
-  int s;
-
-  /* Copy rescue directory from user. */
-  if (m_ptr->RS_CMD_LEN > MAX_RESCUE_DIR_LEN) return(E2BIG);
-  if (OK!=(s=sys_datacopy(m_ptr->m_source, (vir_bytes) m_ptr->RS_CMD_ADDR, 
-  	SELF, (vir_bytes) rescue_dir, m_ptr->RS_CMD_LEN))) return(s);
-  rescue_dir[m_ptr->RS_CMD_LEN] = '\0';		/* ensure it is terminated */
-  if (rescue_dir[0] != '/') return(EINVAL);	/* insist on absolute path */
-
-  /* Change RS' directory to the rescue directory. Provided that the needed
-   * binaries are in the rescue dir, this makes recovery possible even if the 
-   * (root) file system is no longer available, because no directory lookups
-   * are required. Thus if an absolute path fails, we can try to strip the 
-   * path an see if the command is in the rescue dir. 
-   */
-  if (chdir(rescue_dir) != 0) return(errno);
-  return(OK);
-}
-
 /*===========================================================================*
  *				do_shutdown				     *
  *===========================================================================*/
diff --git a/servers/rs/service.c b/servers/rs/service.c
index 8ed7a8f55..b2d1f48a4 100644
--- a/servers/rs/service.c
+++ b/servers/rs/service.c
@@ -6,6 +6,7 @@
  */
 
 #include <stdarg.h>
+#include <assert.h>
 #include <stdlib.h>
 #include <stdio.h>
 #include <string.h>
@@ -30,7 +31,7 @@ PRIVATE char *known_requests[] = {
   "down",
   "refresh", 
   "restart",
-  "rescue", 
+  "-unused",
   "shutdown", 
   "upcopy",	/* fill for RS_UP_COPY */
   "catch for illegal requests"
@@ -63,9 +64,11 @@ PRIVATE char *known_requests[] = {
 #define ARG_SCRIPT	"-script"	/* name of the script to restart a
 					 * driver 
 					 */
+#define ARG_LABELNAME	"-label"	/* custom label name */
 #define ARG_CONFIG	"-config"	/* name of the file with the resource
 					 * configuration 
 					 */
+#define ARG_PRINTEP	"-printep"	/* print endpoint number after start */
 
 #define DRIVER_LOGIN	"driver"	/* Passwd file entry for drivers */
 
@@ -83,7 +86,9 @@ PRIVATE char *req_args;
 PRIVATE int req_major;
 PRIVATE long req_period;
 PRIVATE char *req_script;
+PRIVATE char *req_label;
 PRIVATE char *req_config;
+PRIVATE int req_printep;
 PRIVATE int class_recurs;	/* Nesting level of class statements */
 
 /* Buffer to build "/command arg1 arg2 ..." string to pass to RS server. */
@@ -199,6 +204,7 @@ PRIVATE int parse_arguments(int argc, char **argv)
           print_usage(argv[ARG_NAME], "binary should be absolute path");
           exit(EINVAL);
       }
+
       if (stat(req_path, &stat_buf) == -1) {
 	  perror(req_path);
           fprintf(stderr, "couldn't get stat binary\n");
@@ -242,10 +248,17 @@ PRIVATE int parse_arguments(int argc, char **argv)
               req_script = argv[i+1];
 	      req_nr = RS_START;
           }
+          else if (strcmp(argv[i], ARG_LABELNAME)==0) {
+              req_label = argv[i+1];
+	      req_nr = RS_START;
+          }
           else if (strcmp(argv[i], ARG_CONFIG)==0) {
               req_config = argv[i+1];
 	      req_nr = RS_START;
           }
+          else if (strcmp(argv[i], ARG_PRINTEP)==0) {
+              req_printep = 1;
+          }
           else {
               print_usage(argv[ARG_NAME], "unknown optional argument given");
               exit(EINVAL);
@@ -261,27 +274,6 @@ PRIVATE int parse_arguments(int argc, char **argv)
       }
       req_label= argv[optind+ARG_LABEL];
   } 
-  else if (req_nr == RS_RESCUE) {
-
-      /* Verify argument count. */ 
-      if (argc - 1 < optind+ARG_PATH) {
-          print_usage(argv[ARG_NAME], "action requires rescue directory");
-          exit(EINVAL);
-      }
-      req_path = argv[optind+ARG_PATH];
-      if (req_path[0] != '/') {
-          print_usage(argv[ARG_NAME], "rescue dir should be absolute path");
-          exit(EINVAL);
-      }
-      if (stat(argv[optind+ARG_PATH], &stat_buf) == -1) {
-          print_usage(argv[ARG_NAME], "couldn't get status of directory");
-          exit(errno);
-      }
-      if ( ! (stat_buf.st_mode & S_IFDIR)) {
-          print_usage(argv[ARG_NAME], "file is not a directory");
-          exit(EINVAL);
-      } 
-  } 
   else if (req_nr == RS_SHUTDOWN) {
         /* no extra arguments required */
   }
@@ -658,6 +650,7 @@ struct
 	int call_nr;
 } system_tab[]=
 {
+	{ "EXIT",		SYS_EXIT },
 	{ "PRIVCTL",		SYS_PRIVCTL },
 	{ "TRACE",		SYS_TRACE },
 	{ "KILL",		SYS_KILL },
@@ -871,7 +864,7 @@ PUBLIC int main(int argc, char **argv)
   int result;
   int request;
   int i, s;
-  char *label;
+  char *label, *progname = NULL;
   struct passwd *pw;
 
   /* Verify and parse the command line arguments. All arguments are checked
@@ -881,6 +874,13 @@ PUBLIC int main(int argc, char **argv)
    */
   request = parse_arguments(argc, argv);
 
+  if(req_path) {
+	/* Obtain binary name. */
+	progname = strrchr(req_path, '/');
+	assert(progname);	/* an absolute path was required */
+	progname++;	/* skip last slash */
+  }
+
   /* Arguments seem fine. Try to perform the request. Only valid requests 
    * should end up here. The default is used for not yet supported requests. 
    */
@@ -912,6 +912,13 @@ PUBLIC int main(int argc, char **argv)
       rs_start.rss_major= req_major;
       rs_start.rss_period= req_period;
       rs_start.rss_script= req_script;
+      if(req_label) {
+      	rs_start.rss_label = req_label;
+      	rs_start.rss_labellen = strlen(req_label);
+      } else {
+        rs_start.rss_label = progname;
+        rs_start.rss_labellen = strlen(progname);
+      }
       if (req_script)
 	      rs_start.rss_scriptlen= strlen(req_script);
       else
@@ -925,14 +932,18 @@ PUBLIC int main(int argc, char **argv)
       /* The name of the driver */
       (label= strrchr(req_path, '/')) ? label++ : (label= req_path);
 
-      if (req_config)
-	do_config(label, req_config);
+      if (req_config) {
+	assert(progname);
+	do_config(progname, req_config);
+      }
 
       m.RS_CMD_ADDR = (char *) &rs_start;
 
       /* Build request message and send the request. */
       if (OK != (s=_taskcall(RS_PROC_NR, request, &m))) 
           failure(-s);
+      else if(req_printep)
+	printf("%d\n", m.RS_ENDPOINT);	
       result = m.m_type;
       break;
 
@@ -941,13 +952,6 @@ PUBLIC int main(int argc, char **argv)
   case RS_RESTART:
       m.RS_CMD_ADDR = req_label;
       m.RS_CMD_LEN = strlen(req_label);
-printf("RS_CMD_LEN = %d\n", m.RS_CMD_LEN);
-      if (OK != (s=_taskcall(RS_PROC_NR, request, &m))) 
-          failure(-s);
-      break;
-  case RS_RESCUE:
-      m.RS_CMD_ADDR = req_path;
-      m.RS_CMD_LEN = strlen(req_path);
       if (OK != (s=_taskcall(RS_PROC_NR, request, &m))) 
           failure(-s);
       break;
diff --git a/servers/vfs/mount.c b/servers/vfs/mount.c
index f337e3bef..6eb207027 100644
--- a/servers/vfs/mount.c
+++ b/servers/vfs/mount.c
@@ -32,7 +32,6 @@
 PRIVATE int allow_newroot = 1;
 
 FORWARD _PROTOTYPE( dev_t name_to_dev, (void)                           );
-FORWARD _PROTOTYPE( int fs_exit, (endpoint_t fs_e)                      );
 FORWARD _PROTOTYPE( int mount_fs, (endpoint_t fs_e)                     );
 
 /*===========================================================================*
@@ -71,7 +70,6 @@ PUBLIC int do_fslogin()
 PUBLIC int do_mount()
 {
   endpoint_t fs_e; 
-  int r;
 
   /* Only the super-user may do MOUNT. */
   if (!super_user) return(EPERM);
@@ -86,17 +84,7 @@ PUBLIC int do_mount()
   }
 
   /* Do the actual job */
-  r = mount_fs(fs_e);
-
-  /* If not OK and not suspended, bring down FS proc.. */
-  if (r != OK && r != SUSPEND) {
-      /* Ask RS to bring down FS */
-      if (-1 == fs_exit(fs_e)) {
-          printf("VFSmount: WARNING: couldn't stop FS endp: %d\n", fs_e);
-      }
-  }
-  
-  return r; 
+  return mount_fs(fs_e);
 }
 
 
@@ -482,7 +470,7 @@ Dev_t dev;
 
   /* Find vmnt */
   for (vmp_i = &vmnt[0]; vmp_i < &vmnt[NR_MNTS]; ++vmp_i) {
-      if (vmp->m_dev == dev) {
+      if (vmp_i->m_dev == dev) {
 	if(vmp) panic(__FILE__, "device mounted more than once", dev);
 	vmp = vmp_i;
       }
@@ -560,12 +548,6 @@ Dev_t dev;
   vmp->m_fs_e = NONE;
   vmp->m_driver_e = NONE;
 
-  /* Ask RS to bring down FS */
-  if (-1 == fs_exit(fs_e)) {
-      printf("VFSunmount: WARNING: couldn't stop FS endp: %d\n", fs_e);
-  }
-
-  printf("VFSunmount: DEV: %d unmounted\n", dev);  
   return(OK);
 }
 
@@ -596,35 +578,3 @@ PRIVATE dev_t name_to_dev()
   return res.dev;
 }
 
-
-/*===========================================================================*
- *                              fs_exit                                      *
- *===========================================================================*/
-PRIVATE int fs_exit(fs_e)
-endpoint_t fs_e;
-{
-/* Build a message for stoping a FS server and ask RS to do it */
-  message m;
-  pid_t fs_pid;
-  int r;
-
-  /* Don't need to stop the one in the bootimage */
-  if (fs_e == MFS_PROC_NR) return OK;
-  
-  /* Get pid for this endpoint */
-  if (-1 == (fs_pid = getnpid(fs_e))) {
-      printf("VFS: couldn't find pid for fs_e: %d\n", fs_e);
-      return -1;
-  }
-
-  /* Ask RS to stop process */
-  m.RS_PID = fs_pid;
-  if (OK != (r = _taskcall(RS_PROC_NR, RS_DOWN, &m))) {
-      printf("VFSfs_exit: couldn't bring FS down pid: %d\n", fs_pid);
-      return -1;
-  }
-
-  return OK;
-}
-
-
diff --git a/servers/vfs/request.c b/servers/vfs/request.c
index 4e2d739f3..4f620911d 100644
--- a/servers/vfs/request.c
+++ b/servers/vfs/request.c
@@ -792,7 +792,7 @@ endpoint_t driver_e;
 
     /* Issue request */
     if ((r = sendrec(fs_e, &m)) != OK) {
-        printf("VFSreq_newdriver: error sending message to %d\n", fs_e);
+        printf("VFSreq_newdriver: error sending message to %d: %d\n", fs_e, r);
         return r;
     }
 
@@ -971,17 +971,19 @@ PRIVATE int fs_sendrec(endpoint_t fs_e, message *reqm)
   
   for (;;) {
       /* Do the actual send, receive */
-      if (OK != sendrec(fs_e, reqm)) {
-          printf("VFS: error sending message. FS_e: %d req_nr: %d\n", 
-                  fs_e, reqm->m_type);
+      if (OK != (r=sendrec(fs_e, reqm))) {
+          printf("VFS: error sending message. FS_e: %d req_nr: %d err: %d\n", 
+                  fs_e, reqm->m_type, r);
       }
 
-      /* Get response type */
-      r = reqm->m_type;
+      if(r == OK) {
+      	/* Sendrec was okay */
+      	break;
+      }
 
       /* Dead driver */
       if (r == EDEADSRCDST || r == EDSTDIED || r == ESRCDIED) {
-          old_driver_e = 0;
+          old_driver_e = NONE;
           /* Find old driver enpoint */
           for (vmp = &vmnt[0]; vmp < &vmnt[NR_MNTS]; ++vmp) {
               if (vmp->m_fs_e == reqm->m_source) {   /* found FS */
@@ -992,7 +994,7 @@ PRIVATE int fs_sendrec(endpoint_t fs_e, message *reqm)
           }
          
           /* No FS ?? */
-          if (!old_driver_e) {
+          if (old_driver_e == NONE) {
               panic(__FILE__, "VFSdead_driver: couldn't find FS\n", 
 			      old_driver_e);
           }
@@ -1033,12 +1035,13 @@ PRIVATE int fs_sendrec(endpoint_t fs_e, message *reqm)
           *reqm = origm;  
           continue;
       }
-      
-      /* Sendrec was okay */
-      break;
+
+       printf("fs_sendrec: unhandled error %d sending to %d\n", r, fs_e);
+       panic(__FILE__, "fs_sendrec: unhandled error", NO_NUM);
   }
+
   /* Return message type */
-  return r;
+  return reqm->m_type;
 }
 
 
diff --git a/servers/vfs/utility.c b/servers/vfs/utility.c
index bbfb4a015..b5410c3c5 100644
--- a/servers/vfs/utility.c
+++ b/servers/vfs/utility.c
@@ -64,7 +64,7 @@ int flag;			/* M3 means path may be in message */
 
   if(user_fullpath[len-1] != '\0') {
 	int i;
-	printf("fetch_name: name not null-terminated: ");
+	printf("vfs: fetch_name: name not null-terminated: ");
 	for(i = 0; i < len; i++) {
 		printf("%c", user_fullpath[i]);
 	}
@@ -115,11 +115,11 @@ PUBLIC int isokendpt_f(char *file, int line, int endpoint, int *proc, int fatal)
     int failed = 0;
     *proc = _ENDPOINT_P(endpoint);
     if(*proc < 0 || *proc >= NR_PROCS) {
-        printf("FS:%s:%d: proc (%d) from endpoint (%d) out of range\n",
+        printf("vfs:%s:%d: proc (%d) from endpoint (%d) out of range\n",
                 file, line, *proc, endpoint);
         failed = 1;
     } else if(fproc[*proc].fp_endpoint != endpoint) {
-        printf("FS:%s:%d: proc (%d) from endpoint (%d) doesn't match "
+        printf("vfs:%s:%d: proc (%d) from endpoint (%d) doesn't match "
                 "known endpoint (%d)\n",
                 file, line, *proc, endpoint, fproc[*proc].fp_endpoint);
         failed = 1;