linux-null-superblock-if-mount-failed-20040728

FIXES 6002

The appended patch resets afs_globalVFS to NULL if /afs cannot be mounted,
eg., if no cell server is accessible.

There are two advantages:

 - it is possible to do "afsd -shutdown" to terminate all daemons
 - more importantly, if /afs cannot be mounted, the linux kernel will
   probably free the superblock, ie the memory pointed to afs_globalVFS.

diff --git a/src/afs/LINUX/osi_vfsops.c b/src/afs/LINUX/osi_vfsops.c
index 05d1e7c8c8d56229e1d9b08297f39584af118f64..3b895e4b535779cacc38722940687199a22e7cf8 100644 (file)
--- a/src/afs/LINUX/osi_vfsops.c
+++ b/src/afs/LINUX/osi_vfsops.c
@@ -138,12 +138,14 @@ afs_read_super(struct super_block *sb, void *data, int silent)
     sb->s_maxbytes = MAX_NON_LFS;
 #endif
     code = afs_root(sb);
-    if (code)
+    if (code) {
+       afs_globalVFS = NULL;
 #if defined(AFS_LINUX26_ENV)
-       module_put(THIS_MODULE);
+        module_put(THIS_MODULE);
 #else
-       MOD_DEC_USE_COUNT;
+        MOD_DEC_USE_COUNT;
 #endif
+    }
 
 #if !defined(AFS_LINUX24_ENV)
     unlock_super(sb);