From: Keir Fraser <keir.fraser@citrix.com>
Date: Tue, 15 Jul 2008 16:59:31 +0000 (+0100)
Subject: fs-backend: Fix freelist implementation
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14188^2~14
X-Git-Url: https://dgit.raspbian.org/%22http://www.example.com/cgi/success//%22http:/www.example.com/cgi/success/?a=commitdiff_plain;h=3123fe0fc48c030f8b3c785741df041210923942;p=xen.git

fs-backend: Fix freelist implementation

Signed-off-by: Samuel Thibault <samuel.thibault@eu.citrix.com>
---

diff --git a/tools/fs-back/fs-backend.c b/tools/fs-back/fs-backend.c
index fd5ba2b46b..71518f0aa2 100644
--- a/tools/fs-back/fs-backend.c
+++ b/tools/fs-back/fs-backend.c
@@ -110,9 +110,9 @@ void allocate_request_array(struct mount *mount)
     unsigned short *freelist;
     
     requests = malloc(sizeof(struct fs_request) *nr_entries);
-    freelist = malloc(sizeof(unsigned short) * nr_entries); 
+    freelist = malloc(sizeof(unsigned short) * (nr_entries + 1)); 
     memset(requests, 0, sizeof(struct fs_request) * nr_entries);
-    memset(freelist, 0, sizeof(unsigned short) * nr_entries);
+    memset(freelist, 0, sizeof(unsigned short) * (nr_entries + 1));
     for(i=0; i< nr_entries; i++)
     {
         requests[i].active = 0; 
diff --git a/tools/fs-back/fs-backend.h b/tools/fs-back/fs-backend.h
index 9150d214a5..bf54dae531 100644
--- a/tools/fs-back/fs-backend.h
+++ b/tools/fs-back/fs-backend.h
@@ -72,14 +72,14 @@ extern struct fs_op *fsops[];
 
 static inline void add_id_to_freelist(unsigned int id,unsigned short* freelist)
 {
-    freelist[id] = freelist[0];
+    freelist[id + 1] = freelist[0];
     freelist[0]  = id;
 }
 
 static inline unsigned short get_id_from_freelist(unsigned short* freelist)
 {
     unsigned int id = freelist[0];
-    freelist[0] = freelist[id];
+    freelist[0] = freelist[id + 1];
     return id;
 }