STABLE12-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.

(cherry picked from commit e5e7801db895b1e57ff99fb59371aee47ac33b9c)

diff --git a/src/afs/LINUX/osi_vfsops.c b/src/afs/LINUX/osi_vfsops.c
index 6dc3a138069104d7282efd547cfb23bf7f5f6a49..18b320b6d491d59f91bd540b02139b9555788a1d 100644 (file)
--- a/src/afs/LINUX/osi_vfsops.c
+++ b/src/afs/LINUX/osi_vfsops.c
@@ -99,8 +99,14 @@ struct super_block *afs_read_super(struct super_block *sb, void *data,
     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);
+#else
        MOD_DEC_USE_COUNT;
+#endif
+    }
 
 #if !defined(AFS_LINUX24_ENV)
     unlock_super(sb);