From 2c56547272e43b483d560a61692f1e24926a82fb Mon Sep 17 00:00:00 2001
From: Robert Morris <rtm@csail.mit.edu>
Date: Mon, 4 Aug 2014 13:06:48 -0400
Subject: every iput() and namei() must be inside a transaction

---
 exec.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

(limited to 'exec.c')

diff --git a/exec.c b/exec.c
index a85e203..7eaef5b 100644
--- a/exec.c
+++ b/exec.c
@@ -18,8 +18,11 @@ exec(char *path, char **argv)
   struct proghdr ph;
   pde_t *pgdir, *oldpgdir;
 
-  if((ip = namei(path)) == 0)
+  begin_trans();
+  if((ip = namei(path)) == 0){
+    commit_trans();
     return -1;
+  }
   ilock(ip);
   pgdir = 0;
 
@@ -47,6 +50,7 @@ exec(char *path, char **argv)
       goto bad;
   }
   iunlockput(ip);
+  commit_trans();
   ip = 0;
 
   // Allocate two pages at the next page boundary.
@@ -95,7 +99,9 @@ exec(char *path, char **argv)
  bad:
   if(pgdir)
     freevm(pgdir);
-  if(ip)
+  if(ip){
     iunlockput(ip);
+    commit_trans();
+  }
   return -1;
 }
-- 
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