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disallow walk on open chans

--- a/sys/src/cmd/hjfs/fs2.c

+++ b/sys/src/cmd/hjfs/fs2.c

@@ -43,6 +43,11 @@

 	if(name == nil || name[0] == 0 || name[0] == '.' && name[1] == 0)

 		return 1;

 	chbegin(ch);

+  if(ch->open != 0){

+    werrstr(Einval);

+    chend(ch);

+    return -1;

+  }

 	b = getbuf(ch->fs->d, ch->loc->blk, TDENTRY, 0);

 	if(b == nil){

 		chend(ch);

-- 

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