[PATCH] v9fs: transport modules

[linux-2.6-omap-h63xx.git] / fs / namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index 79bd8a46e1e7298859a85f9ed9efd20e1dfdb19c..34156260c9b6586939e932e3856cc0211e98cd97 100644 (file)
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -40,7 +40,7 @@ static inline int sysfs_init(void)
  __cacheline_aligned_in_smp DEFINE_SPINLOCK(vfsmount_lock);
 
 static struct list_head *mount_hashtable;
-static int hash_mask, hash_bits;
+static int hash_mask __read_mostly, hash_bits __read_mostly;
 static kmem_cache_t *mnt_cache; 
 
 static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry)
@@ -1334,8 +1334,12 @@ asmlinkage long sys_pivot_root(const char __user *new_root, const char __user *p
        error = -EINVAL;
        if (user_nd.mnt->mnt_root != user_nd.dentry)
                goto out2; /* not a mountpoint */
+       if (user_nd.mnt->mnt_parent == user_nd.mnt)
+               goto out2; /* not attached */
        if (new_nd.mnt->mnt_root != new_nd.dentry)
                goto out2; /* not a mountpoint */
+       if (new_nd.mnt->mnt_parent == new_nd.mnt)
+               goto out2; /* not attached */
        tmp = old_nd.mnt; /* make sure we can reach put_old from new_root */
        spin_lock(&vfsmount_lock);
        if (tmp != new_nd.mnt) {