[PATCH] spinlock consolidation

[pandora-kernel.git] / fs / namespace.c

diff --git a/fs/namespace.c b/fs/namespace.c
index 587eb0d..3415626 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)
@@ -160,7 +160,7 @@ clone_mnt(struct vfsmount *old, struct dentry *root)
                mnt->mnt_root = dget(root);
                mnt->mnt_mountpoint = mnt->mnt_root;
                mnt->mnt_parent = mnt;
-               mnt->mnt_namespace = old->mnt_namespace;
+               mnt->mnt_namespace = current->namespace;
 
                /* stick the duplicate mount on the same expiry list
                 * as the original if that was on one */
@@ -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) {