xv6

commit 5f0c20ec14dc1c97519e0843d715fd91b430e77c
parent 5bbba977d1257659485a924d01f1975e5d5f2c91
Author: rsc <rsc>
Date:   Wed,  8 Aug 2007 09:08:29 +0000

fix . .. unlink bug

Diffstat:
M
BUGS
 | 
2
--
M
fs.c
 | 
6
++++++

2 files changed, 6 insertions(+), 2 deletions(-)
diff --git 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
 
diff --git 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;
     }