linux-kernel - linux-next: manual merge of the userns tree with Linus' tree

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Message-Id: <20140409124520.aa778b59b4e6f38bc5f2bef5@canb.auug.org.au>
Date:	Wed, 9 Apr 2014 12:45:20 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	linux-next@...r.kernel.org, linux-kernel@...r.kernel.org,
	Al Viro <viro@...iv.linux.org.uk>
Subject: linux-next: manual merge of the userns tree with Linus' tree

Hi Eric,

Today's linux-next merge of the userns tree got a conflict in
fs/namespace.c between commits  from Linus' tree and commits from the
userns tree.

I fixed it up (I used the conflict resolution that your sent to Linus -
see below) and can carry the fix as necessary (no action is required).

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au

diff --cc fs/namespace.c
index 2ffc5a2905d4,52f4174e294c..000000000000
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@@ -665,13 -632,47 +666,47 @@@ struct vfsmount *lookup_mnt(struct pat
  	return m;
  }
  
- static struct mountpoint *new_mountpoint(struct dentry *dentry)
+ /*
+  * __is_local_mountpoint - Test to see if dentry is a mountpoint in the
+  *                         current mount namespace.
+  *
+  * The common case is dentries are not mountpoints at all and that
+  * test is handled inline.  For the slow case when we are actually
+  * dealing with a mountpoint of some kind, walk through all of the
+  * mounts in the current mount namespace and test to see if the dentry
+  * is a mountpoint.
+  *
+  * The mount_hashtable is not usable in the context because we
+  * need to identify all mounts that may be in the current mount
+  * namespace not just a mount that happens to have some specified
+  * parent mount.
+  */
+ bool __is_local_mountpoint(struct dentry *dentry)
+ {
+ 	struct mnt_namespace *ns = current->nsproxy->mnt_ns;
+ 	struct mount *mnt;
+ 	bool is_covered = false;
+ 
+ 	if (!d_mountpoint(dentry))
+ 		goto out;
+ 
+ 	down_read(&namespace_sem);
+ 	list_for_each_entry(mnt, &ns->list, mnt_list) {
+ 		is_covered = (mnt->mnt_mountpoint == dentry);
+ 		if (is_covered)
+ 			break;
+ 	}
+ 	up_read(&namespace_sem);
+ out:
+ 	return is_covered;
+ }
+ 
+ static struct mountpoint *lookup_mountpoint(struct dentry *dentry)
  {
 -	struct list_head *chain = mountpoint_hashtable + hash(NULL, dentry);
 +	struct hlist_head *chain = mp_hash(dentry);
  	struct mountpoint *mp;
- 	int ret;
  
 -	list_for_each_entry(mp, chain, m_hash) {
 +	hlist_for_each_entry(mp, chain, m_hash) {
  		if (mp->m_dentry == dentry) {
  			/* might be worth a WARN_ON() */
  			if (d_unlinked(dentry))
@@@ -680,6 -681,14 +715,14 @@@
  			return mp;
  		}
  	}
+ 	return NULL;
+ }
+ 
+ static struct mountpoint *new_mountpoint(struct dentry *dentry)
+ {
 -	struct list_head *chain = mountpoint_hashtable + hash(NULL, dentry);
++	struct hlist_head *chain = mp_hash(dentry);
+ 	struct mountpoint *mp;
+ 	int ret;
  
  	mp = kmalloc(sizeof(struct mountpoint), GFP_KERNEL);
  	if (!mp)
@@@ -693,7 -702,8 +736,8 @@@
  
  	mp->m_dentry = dentry;
  	mp->m_count = 1;
 -	list_add(&mp->m_hash, chain);
 +	hlist_add_head(&mp->m_hash, chain);
+ 	INIT_LIST_HEAD(&mp->m_list);
  	return mp;
  }
  
@@@ -746,7 -757,8 +791,8 @@@ static void detach_mnt(struct mount *mn
  	mnt->mnt_parent = mnt;
  	mnt->mnt_mountpoint = mnt->mnt.mnt_root;
  	list_del_init(&mnt->mnt_child);
 -	list_del_init(&mnt->mnt_hash);
 +	hlist_del_init_rcu(&mnt->mnt_hash);
+ 	list_del_init(&mnt->mnt_mp_list);
  	put_mountpoint(mnt->mnt_mp);
  	mnt->mnt_mp = NULL;
  }


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