fix . .. unlink bug

5f0c20ec · rsc · 5bbba977 · 5f0c20ec · 5f0c20ec
--- a/BUGS
+++ b/BUGS
@@ -33,7 +33,5 @@ ide.c: synchronous disk write -> polling disk write.  search for
 fs.c: split all name operations off in name.c?  (starting with namei but move 
      wdir keep in fs.c)

-      unlink . and .. should be disallowed
-
 ls.c: apply tim's patch

--- a/fs.c
+++ b/fs.c
@@ -579,6 +579,12 @@ namei(char *path, int mode, uint *ret_off,

  found:
    if(mode == NAMEI_DELETE && *cp == '\0'){
+      // can't unlink . and ..
+      if((i == 1 && memcmp(cp-1, ".", 1) == 0) ||
+         (i == 2 && memcmp(cp-2, "..", 2) == 0)){
+        iput(dp);
+        return 0;
+      }
      *ret_off = off;
      return dp;
    }