- some exec debugging prints when errors happen

- lookup mounted_on check to avoid NULL dereference
 - some errors in exec() shouldn't be fatal

servers/vfs/exec.c

@@ -104,8 +104,6 @@ printf("return at %s, %d\n", __FILE__, __LINE__);
     /* Fetch the stack from the user before destroying the old core image. */
     if (frame_len > ARG_MAX)
     {
-        printf("pm_exec: bad frame_len\n");
-printf("return at %s, %d\n", __FILE__, __LINE__);
         return(ENOMEM);	/* stack too big */
     }
     r = sys_datacopy(proc_e, (vir_bytes) frame,
@@ -210,7 +208,7 @@ printf("return at %s, %d\n", __FILE__, __LINE__);
             progname, new_uid, new_gid, &stack_top, &load_text, &allow_setuid);
     if (r != OK)
     {
-        printf("pm_exec: exec_newmap failed: %d\n", r);
+        printf("VFS: pm_exec: exec_newmem failed: %d\n", r);
         put_vnode(vp);
         return r;
     }
@@ -223,7 +221,7 @@ printf("return at %s, %d\n", __FILE__, __LINE__);
             proc_e, (vir_bytes) vsp, (phys_bytes)frame_len);
     if (r != OK) {
 	printf("vfs: datacopy returns %d trying to copy to %p\n", r, vsp);
-	panic(__FILE__,"pm_exec stack copy err on", proc_e);
+	return r;
     }
 
     off = hdrlen;
@@ -591,7 +589,11 @@ phys_bytes seg_bytes;		/* how much is to be transferred? */
   char buf[1024];
 
   /* Make sure that the file is big enough */
-  if (vp->v_size < off+seg_bytes) return EIO;
+  if (vp->v_size < off+seg_bytes) {
+	printf("VFS: read_seg: file isn't big enough (size %ld, need %ld)\n",
+		vp->v_size, off+seg_bytes);
+	return EIO;
+  }
 
   if (seg != D)
   {
@@ -612,7 +614,10 @@ printf("read_seg for user %d, seg %d: buf 0x%x, size %d, pos %d\n",
 		r = req_readwrite(vp->v_fs_e, vp->v_inode_nr, vp->v_index,
 			cvul64(off+o), READING, FS_PROC_NR, buf, n, &new_pos,
 			&cum_io_incr);
-		if (r != OK) return r;
+		if (r != OK) {
+			printf("VFS: read_seg: req_readwrite failed (text)\n");
+			return r;
+		}
 
 		if (cum_io_incr != n)
 		{
@@ -623,8 +628,10 @@ printf("read_seg for user %d, seg %d: buf 0x%x, size %d, pos %d\n",
 
 		r= sys_vircopy(FS_PROC_NR, D, (vir_bytes)buf, proc_e, seg, o,
 			n);
-		if (r != OK)
+		if (r != OK) {
+			printf("VFS: read_seg: copy failed (text)\n");
 			return r;
+		}
 
 		o += n;
 	}
@@ -639,7 +646,10 @@ printf("read_seg for user %d, seg %d: buf 0x%x, size %d, pos %d\n",
   /* Issue request */
   r = req_readwrite(vp->v_fs_e, vp->v_inode_nr, vp->v_index, cvul64(off),
 	READING, proc_e, 0, seg_bytes, &new_pos, &cum_io_incr);
-  if (r != OK) return r;
+  if (r != OK) {
+	printf("VFS: read_seg: req_readwrite failed (data)\n");
+	return r;
+  }
   
   if (r == OK && cum_io_incr != seg_bytes)
       printf("VFSread_seg segment has not been read properly by exec() \n");

servers/vfs/main.c

@@ -26,6 +26,7 @@
 #include <minix/const.h>
 #include <minix/endpoint.h>
 #include <minix/safecopies.h>
+#include <minix/debug.h>
 #include "file.h"
 #include "fproc.h"
 #include "param.h"
@@ -59,6 +60,10 @@ PUBLIC int main()
 
   SANITYCHECK;
 
+#if DO_SANITYCHECKS
+  FIXME("VFS: DO_SANITYCHECKS is on");
+#endif
+
   /* This is the main loop that gets work, processes it, and sends replies. */
   while (TRUE) {
 	SANITYCHECK;
@@ -285,9 +290,14 @@ PRIVATE void get_work()
 	continue;
     }
     if(who_p >= 0 && fproc[who_p].fp_endpoint != who_e) {
-    	printf("FS: receive endpoint inconsistent (%d, %d, %d).\n",
+	if(fproc[who_p].fp_endpoint == NONE) { 
-		who_e, fproc[who_p].fp_endpoint, who_e);
+		printf("slot unknown even\n");
+	}
+    	printf("FS: receive endpoint inconsistent (source %d, who_p %d, stored ep %d, who_e %d).\n",
+		m_in.m_source, who_p, fproc[who_p].fp_endpoint, who_e);
+#if 0
 	panic(__FILE__, "FS: inconsistent endpoint ", NO_NUM);
+#endif
 	continue;
     }
     call_nr = m_in.m_type;

servers/vfs/path.c

@@ -308,12 +308,20 @@ node_details_t *node;
 		dir_vp = 0;
 		/* Start node is now the mounted partition's root node */
 		for (vmp = &vmnt[0]; vmp != &vmnt[NR_MNTS]; ++vmp) {
-			if (vmp->m_mounted_on->v_inode_nr == res.inode_nr &&
+			if (vmp->m_dev != NO_DEV) {
+				if(vmp->m_mounted_on &&
+					vmp->m_mounted_on->v_inode_nr ==
+					res.inode_nr &&
 					vmp->m_mounted_on->v_fs_e == res.fs_e) {
 				dir_vp = vmp->m_root_node;
+				if(!dir_vp) {
+					panic(__FILE__,
+						"vfs: root_node NULL", NO_NUM);
+				}
 				break;
 			   }
 			}
+		}
 		if (!dir_vp) {
 			printf(
 			"vfs:lookup_rel: res.inode_nr = %d, res.fs_e = %d\n",

servers/vfs/request.c

@@ -126,7 +126,11 @@ mode_t *new_modep;
     m.REQ_INODE_NR = inode_nr;
     m.REQ_UID = fp->fp_effuid;
     m.REQ_GID = fp->fp_effgid;
+    if (newuid == -1)
+        newuid = fp->fp_effuid;
     m.REQ_NEW_UID = newuid;
+    if (newgid == -1)
+        newgid = fp->fp_effgid;
     m.REQ_NEW_GID = newgid;
 
     /* Send/rec request */