aufs2 standalone patch for linux-2.6.27

diff --git a/fs/Kconfig b/fs/Kconfig
index abccb5d..b987e5e 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -1539,6 +1539,8 @@ config UFS_DEBUG
 	  Y here.  This will result in _many_ additional debugging messages to be
 	  written to the system log.
 
+source "fs/aufs/Kconfig"
+
 endmenu
 
 menuconfig NETWORK_FILESYSTEMS
diff --git a/fs/Makefile b/fs/Makefile
index a1482a5..aa51c5a 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -122,3 +122,4 @@ obj-$(CONFIG_HPPFS)		+= hppfs/
 obj-$(CONFIG_DEBUG_FS)		+= debugfs/
 obj-$(CONFIG_OCFS2_FS)		+= ocfs2/
 obj-$(CONFIG_GFS2_FS)           += gfs2/
+obj-$(CONFIG_AUFS_FS)           += aufs/
diff --git a/fs/namei.c b/fs/namei.c
index 4ea63ed..b207821 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -354,6 +354,7 @@ int deny_write_access(struct file * file)
 
 	return 0;
 }
+EXPORT_SYMBOL(deny_write_access);
 
 /**
  * path_get - get a reference to a path
@@ -1241,7 +1242,7 @@ out:
  * needs parent already locked. Doesn't follow mounts.
  * SMP-safe.
  */
-static struct dentry *lookup_hash(struct nameidata *nd)
+struct dentry *lookup_hash(struct nameidata *nd)
 {
 	int err;
 
@@ -1250,8 +1251,9 @@ static struct dentry *lookup_hash(struct nameidata *nd)
 		return ERR_PTR(err);
 	return __lookup_hash(&nd->last, nd->path.dentry, nd);
 }
+EXPORT_SYMBOL(lookup_hash);
 
-static int __lookup_one_len(const char *name, struct qstr *this,
+int __lookup_one_len(const char *name, struct qstr *this,
 		struct dentry *base, int len)
 {
 	unsigned long hash;
@@ -1272,6 +1274,7 @@ static int __lookup_one_len(const char *name, struct qstr *this,
 	this->hash = end_name_hash(hash);
 	return 0;
 }
+EXPORT_SYMBOL(__lookup_one_len);
 
 /**
  * lookup_one_len - filesystem helper to lookup single pathname component
diff --git a/fs/namespace.c b/fs/namespace.c
index 6e283c9..98f56b9 100644
--- a/fs/namespace.c
+++ b/fs/namespace.c
@@ -37,6 +37,9 @@
 
 /* spinlock for vfsmount related operations, inplace of dcache_lock */
 __cacheline_aligned_in_smp DEFINE_SPINLOCK(vfsmount_lock);
+#ifdef CONFIG_AUFS_EXPORT
+EXPORT_SYMBOL(vfsmount_lock);
+#endif
 
 static int event;
 static DEFINE_IDA(mnt_id_ida);
diff --git a/fs/open.c b/fs/open.c
index 07da935..b8e9726 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -222,6 +222,7 @@ int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
 	mutex_unlock(&dentry->d_inode->i_mutex);
 	return err;
 }
+EXPORT_SYMBOL(do_truncate);
 
 static long do_sys_truncate(const char __user *pathname, loff_t length)
 {
diff --git a/fs/splice.c b/fs/splice.c
index a1e701c..48d7e72 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -887,8 +887,8 @@ EXPORT_SYMBOL(generic_splice_sendpage);
 /*
  * Attempt to initiate a splice from pipe to file.
  */
-static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
-			   loff_t *ppos, size_t len, unsigned int flags)
+long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
+		    loff_t *ppos, size_t len, unsigned int flags)
 {
 	int ret;
 
@@ -907,13 +907,14 @@ static long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
 
 	return out->f_op->splice_write(pipe, out, ppos, len, flags);
 }
+EXPORT_SYMBOL(do_splice_from);
 
 /*
  * Attempt to initiate a splice from a file to a pipe.
  */
-static long do_splice_to(struct file *in, loff_t *ppos,
-			 struct pipe_inode_info *pipe, size_t len,
-			 unsigned int flags)
+long do_splice_to(struct file *in, loff_t *ppos,
+		  struct pipe_inode_info *pipe, size_t len,
+		  unsigned int flags)
 {
 	int ret;
 
@@ -929,6 +930,7 @@ static long do_splice_to(struct file *in, loff_t *ppos,
 
 	return in->f_op->splice_read(in, ppos, pipe, len, flags);
 }
+EXPORT_SYMBOL(do_splice_to);
 
 /**
  * splice_direct_to_actor - splices data directly between two non-pipes
diff --git a/fs/super.c b/fs/super.c
index e931ae9..141853c 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -270,6 +270,7 @@ int fsync_super(struct super_block *sb)
 	__fsync_super(sb);
 	return sync_blockdev(sb->s_bdev);
 }
+EXPORT_SYMBOL(fsync_super);
 
 /**
  *	generic_shutdown_super	-	common helper for ->kill_sb()
diff --git a/fs/sync.c b/fs/sync.c
index 2967562..34040d6 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -104,6 +104,7 @@ long do_fsync(struct file *file, int datasync)
 out:
 	return ret;
 }
+EXPORT_SYMBOL(do_fsync);
 
 static long __do_fsync(unsigned int fd, int datasync)
 {
diff --git a/include/linux/Kbuild b/include/linux/Kbuild
index b68ec09..22d182c 100644
--- a/include/linux/Kbuild
+++ b/include/linux/Kbuild
@@ -34,6 +34,7 @@ header-y += atmppp.h
 header-y += atmsap.h
 header-y += atmsvc.h
 header-y += atm_zatm.h
+header-y += aufs_type.h
 header-y += auto_fs4.h
 header-y += ax25.h
 header-y += b1lli.h
diff --git a/include/linux/lockdep.h b/include/linux/lockdep.h
index 331e5f1..606bf6e 100644
--- a/include/linux/lockdep.h
+++ b/include/linux/lockdep.h
@@ -58,7 +58,7 @@ enum lock_usage_bit
 #define LOCKF_USED_IN_IRQ_READ \
 		(LOCKF_USED_IN_HARDIRQ_READ | LOCKF_USED_IN_SOFTIRQ_READ)
 
-#define MAX_LOCKDEP_SUBCLASSES		8UL
+#define MAX_LOCKDEP_SUBCLASSES		12UL
 
 /*
  * Lock-classes are keyed via unique addresses, by embedding the
diff --git a/include/linux/namei.h b/include/linux/namei.h
index 68f8c32..5522432 100644
--- a/include/linux/namei.h
+++ b/include/linux/namei.h
@@ -71,6 +71,9 @@ extern struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry
 extern struct file *nameidata_to_filp(struct nameidata *nd, int flags);
 extern void release_open_intent(struct nameidata *);
 
+extern struct dentry *lookup_hash(struct nameidata *nd);
+extern int __lookup_one_len(const char *name, struct qstr *this,
+			    struct dentry *base, int len);
 extern struct dentry *lookup_one_len(const char *, struct dentry *, int);
 extern struct dentry *lookup_one_noperm(const char *, struct dentry *);
 
diff --git a/include/linux/splice.h b/include/linux/splice.h
index 528dcb9..5123bc6 100644
--- a/include/linux/splice.h
+++ b/include/linux/splice.h
@@ -71,4 +71,10 @@ extern ssize_t splice_to_pipe(struct pipe_inode_info *,
 extern ssize_t splice_direct_to_actor(struct file *, struct splice_desc *,
 				      splice_direct_actor *);
 
+extern long do_splice_from(struct pipe_inode_info *pipe, struct file *out,
+			   loff_t *ppos, size_t len, unsigned int flags);
+extern long do_splice_to(struct file *in, loff_t *ppos,
+			 struct pipe_inode_info *pipe, size_t len,
+			 unsigned int flags);
+
 #endif
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index 46f2397..00ec611 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -537,6 +537,7 @@ acc_check:
 
 	return -EPERM;
 }
+EXPORT_SYMBOL(devcgroup_inode_permission);
 
 int devcgroup_inode_mknod(int mode, dev_t dev)
 {
diff --git a/security/security.c b/security/security.c
index 3a4b4f5..4d7882e 100644
--- a/security/security.c
+++ b/security/security.c
@@ -425,6 +425,7 @@ int security_inode_readlink(struct dentry *dentry)
 		return 0;
 	return security_ops->inode_readlink(dentry);
 }
+EXPORT_SYMBOL(security_inode_readlink);
 
 int security_inode_follow_link(struct dentry *dentry, struct nameidata *nd)
 {
@@ -439,6 +440,7 @@ int security_inode_permission(struct inode *inode, int mask)
 		return 0;
 	return security_ops->inode_permission(inode, mask);
 }
+EXPORT_SYMBOL(security_inode_permission);
 
 int security_inode_setattr(struct dentry *dentry, struct iattr *attr)
 {