Message-Id: <1239346963-30953-10-git-send-email-hooanon05@yahoo.co.jp>
Date:	Fri, 10 Apr 2009 16:02:23 +0900
From:	"J. R. Okajima" <hooanon05@...oo.co.jp>
To:	linux-kernel@...r.kernel.org
Cc:	greg@...ah.com, linux-fsdevel@...r.kernel.org,
	"J. R. Okajima" <hooanon05@...oo.co.jp>
Subject: [RFC Aufs2 #5 09/29] aufs sub-VFS

initial commit
sub-routines or simple wrappers for VFS

Signed-off-by: J. R. Okajima <hooanon05@...oo.co.jp>
---
 fs/aufs/vfsub.c |  748 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/aufs/vfsub.h |  165 ++++++++++++
 2 files changed, 913 insertions(+), 0 deletions(-)
 create mode 100644 fs/aufs/vfsub.c
 create mode 100644 fs/aufs/vfsub.h

diff --git a/fs/aufs/vfsub.c b/fs/aufs/vfsub.c
new file mode 100644
index 0000000..09f5990
--- /dev/null
+++ b/fs/aufs/vfsub.c
@@ -0,0 +1,748 @@
+/*
+ * Copyright (C) 2005-2009 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/*
+ * sub-routines for VFS
+ */
+
+#include <linux/ima.h>
+#include <linux/uaccess.h>
+#include "aufs.h"
+
+int vfsub_update_h_iattr(struct path *h_path, int *did)
+{
+	int err;
+	struct kstat st;
+	struct super_block *h_sb;
+
+	/* for remote fs, leave work for its getattr or d_revalidate */
+	/* for bad i_attr fs, handle them in aufs_getattr() */
+	/* still some fs may acquire i_mutex. we need to skip them */
+	err = 0;
+	if (!did)
+		did = &err;
+	h_sb = h_path->dentry->d_sb;
+	*did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb));
+	if (*did)
+		err = vfs_getattr(h_path->mnt, h_path->dentry, &st);
+
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct file *vfsub_dentry_open(struct dentry *parent, struct vfsmount *mnt,
+			       int flags, const struct cred *cred)
+{
+	struct file *file;
+
+	file = dentry_open(parent, mnt, flags, cred);
+	if (IS_ERR(file))
+		goto out;
+
+	ima_shm_check(file);
+
+ out:
+	return file;
+}
+
+struct file *vfsub_filp_open(const char *path, int oflags, int mode)
+{
+	struct file *file;
+
+	lockdep_off();
+	file = filp_open(path, oflags, mode);
+	lockdep_on();
+	if (IS_ERR(file))
+		goto out;
+	AuDebugOn(!file->f_op);
+	ima_shm_check(file);
+	vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
+
+ out:
+	return file;
+}
+
+int vfsub_kern_path(const char *name, unsigned int flags, struct path *path)
+{
+	int err;
+
+	/* lockdep_off(); */
+	err = kern_path(name, flags, path);
+	/* lockdep_on(); */
+	if (!err && path->dentry->d_inode)
+		vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
+	return err;
+}
+
+struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
+				    int len)
+{
+	struct path path = {
+		.mnt = NULL
+	};
+
+	IMustLock(parent->d_inode);
+
+	path.dentry = lookup_one_len(name, parent, len);
+	if (IS_ERR(path.dentry))
+		goto out;
+	if (path.dentry->d_inode)
+		vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
+
+ out:
+	return path.dentry;
+}
+
+struct dentry *vfsub_lookup_hash(struct nameidata *nd)
+{
+	struct path path = {
+		.mnt = nd->path.mnt
+	};
+
+	IMustLock(nd->path.dentry->d_inode);
+
+	path.dentry = lookup_hash(nd);
+	if (!IS_ERR(path.dentry) && path.dentry->d_inode)
+		vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
+
+	return path.dentry;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
+				 struct dentry *d2, struct au_hinode *hdir2)
+{
+	struct dentry *d;
+
+	lockdep_off();
+	d = lock_rename(d1, d2);
+	lockdep_on();
+	au_hin_suspend(hdir1);
+	if (hdir1 != hdir2)
+		au_hin_suspend(hdir2);
+
+	return d;
+}
+
+void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
+			 struct dentry *d2, struct au_hinode *hdir2)
+{
+	au_hin_resume(hdir1);
+	if (hdir1 != hdir2)
+		au_hin_resume(hdir2);
+	lockdep_off();
+	unlock_rename(d1, d2);
+	lockdep_on();
+}
+
+/* ---------------------------------------------------------------------- */
+
+int vfsub_create(struct inode *dir, struct path *path, int mode)
+{
+	int err;
+	struct dentry *d;
+
+	IMustLock(dir);
+
+	d = path->dentry;
+	path->dentry = d->d_parent;
+	err = security_path_mknod(path, path->dentry, mode, 0);
+	path->dentry = d;
+	if (unlikely(err))
+		goto out;
+
+	if (au_test_fs_null_nd(dir->i_sb))
+		err = vfs_create(dir, path->dentry, mode, NULL);
+	else {
+		struct nameidata h_nd;
+
+		memset(&h_nd, 0, sizeof(h_nd));
+		h_nd.flags = LOOKUP_CREATE;
+		h_nd.intent.open.flags = O_CREAT
+			| vfsub_fmode_to_uint(FMODE_READ);
+		h_nd.intent.open.create_mode = mode;
+		h_nd.path.dentry = path->dentry->d_parent;
+		h_nd.path.mnt = path->mnt;
+		path_get(&h_nd.path);
+		err = vfs_create(dir, path->dentry, mode, &h_nd);
+		path_put(&h_nd.path);
+	}
+
+	if (!err) {
+		struct path tmp = *path;
+		int did;
+
+		vfsub_update_h_iattr(&tmp, &did);
+		if (did) {
+			tmp.dentry = path->dentry->d_parent;
+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
+		}
+		/*ignore*/
+	}
+
+ out:
+	return err;
+}
+
+int vfsub_symlink(struct inode *dir, struct path *path, const char *symname)
+{
+	int err;
+	struct dentry *d;
+
+	IMustLock(dir);
+
+	d = path->dentry;
+	path->dentry = d->d_parent;
+	err = security_path_symlink(path, path->dentry, symname);
+	path->dentry = d;
+	if (unlikely(err))
+		goto out;
+
+	err = vfs_symlink(dir, path->dentry, symname);
+	if (!err) {
+		struct path tmp = *path;
+		int did;
+
+		vfsub_update_h_iattr(&tmp, &did);
+		if (did) {
+			tmp.dentry = path->dentry->d_parent;
+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
+		}
+		/*ignore*/
+	}
+
+ out:
+	return err;
+}
+
+int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev)
+{
+	int err;
+	struct dentry *d;
+
+	IMustLock(dir);
+
+	d = path->dentry;
+	path->dentry = d->d_parent;
+	err = security_path_mknod(path, path->dentry, mode, dev);
+	path->dentry = d;
+	if (unlikely(err))
+		goto out;
+
+	err = vfs_mknod(dir, path->dentry, mode, dev);
+	if (!err) {
+		struct path tmp = *path;
+		int did;
+
+		vfsub_update_h_iattr(&tmp, &did);
+		if (did) {
+			tmp.dentry = path->dentry->d_parent;
+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
+		}
+		/*ignore*/
+	}
+
+ out:
+	return err;
+}
+
+/* ramfs doesn't check i_nlink in link(2), aufs sets a limit for it */
+static int au_test_nlink(struct inode *inode)
+{
+#ifndef CONFIG_AUFS_BR_RAMFS
+	return 0;
+#else
+	/* borrowing the upper limit from EXT2_LINK_MAX */
+	const unsigned int ramfs_link_max = 32000;
+
+	if (!au_test_ramfs(inode->i_sb)
+	    || inode->i_nlink < ramfs_link_max)
+		return 0;
+	return -EMLINK;
+#endif
+}
+
+int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path)
+{
+	int err;
+	struct dentry *d;
+
+	IMustLock(dir);
+
+	err = au_test_nlink(src_dentry->d_inode);
+	if (unlikely(err))
+		return err;
+
+	d = path->dentry;
+	path->dentry = d->d_parent;
+	err = security_path_link(src_dentry, path, path->dentry);
+	path->dentry = d;
+	if (unlikely(err))
+		goto out;
+
+	lockdep_off();
+	err = vfs_link(src_dentry, dir, path->dentry);
+	lockdep_on();
+	if (!err) {
+		struct path tmp = *path;
+		int did;
+
+		/* fuse has different memory inode for the same inumber */
+		vfsub_update_h_iattr(&tmp, &did);
+		if (did) {
+			tmp.dentry = path->dentry->d_parent;
+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
+			tmp.dentry = src_dentry;
+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
+		}
+		/*ignore*/
+	}
+
+ out:
+	return err;
+}
+
+int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
+		 struct inode *dir, struct path *path)
+{
+	int err;
+	struct path tmp = {
+		.mnt	= path->mnt
+	};
+	struct dentry *d;
+
+	IMustLock(dir);
+	IMustLock(src_dir);
+
+	d = path->dentry;
+	path->dentry = d->d_parent;
+	tmp.dentry = src_dentry->d_parent;
+	err = security_path_rename(&tmp, src_dentry, path, path->dentry);
+	path->dentry = d;
+	if (unlikely(err))
+		goto out;
+
+	lockdep_off();
+	err = vfs_rename(src_dir, src_dentry, dir, path->dentry);
+	lockdep_on();
+	if (!err) {
+		int did;
+
+		tmp.dentry = d->d_parent;
+		vfsub_update_h_iattr(&tmp, &did);
+		if (did) {
+			tmp.dentry = src_dentry;
+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
+			tmp.dentry = src_dentry->d_parent;
+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
+		}
+		/*ignore*/
+	}
+
+ out:
+	return err;
+}
+
+int vfsub_mkdir(struct inode *dir, struct path *path, int mode)
+{
+	int err;
+	struct dentry *d;
+
+	IMustLock(dir);
+
+	d = path->dentry;
+	path->dentry = d->d_parent;
+	err = security_path_mkdir(path, path->dentry, mode);
+	path->dentry = d;
+	if (unlikely(err))
+		goto out;
+
+	err = vfs_mkdir(dir, path->dentry, mode);
+	if (!err) {
+		struct path tmp = *path;
+		int did;
+
+		vfsub_update_h_iattr(&tmp, &did);
+		if (did) {
+			tmp.dentry = path->dentry->d_parent;
+			vfsub_update_h_iattr(&tmp, /*did*/NULL);
+		}
+		/*ignore*/
+	}
+
+ out:
+	return err;
+}
+
+int vfsub_rmdir(struct inode *dir, struct path *path)
+{
+	int err;
+	struct dentry *d;
+
+	IMustLock(dir);
+
+	d = path->dentry;
+	path->dentry = d->d_parent;
+	err = security_path_rmdir(path, path->dentry);
+	path->dentry = d;
+	if (unlikely(err))
+		goto out;
+
+	lockdep_off();
+	err = vfs_rmdir(dir, path->dentry);
+	lockdep_on();
+	if (!err) {
+		struct path tmp = {
+			.dentry	= path->dentry->d_parent,
+			.mnt	= path->mnt
+		};
+
+		vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
+	}
+
+ out:
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+		     loff_t *ppos)
+{
+	ssize_t err;
+
+	err = vfs_read(file, ubuf, count, ppos);
+	if (err >= 0)
+		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
+	return err;
+}
+
+/* todo: kernel_read()? */
+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
+		     loff_t *ppos)
+{
+	ssize_t err;
+	mm_segment_t oldfs;
+
+	oldfs = get_fs();
+	set_fs(KERNEL_DS);
+	err = vfsub_read_u(file, (char __user *)kbuf, count, ppos);
+	set_fs(oldfs);
+	return err;
+}
+
+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
+		      loff_t *ppos)
+{
+	ssize_t err;
+
+	lockdep_off();
+	err = vfs_write(file, ubuf, count, ppos);
+	lockdep_on();
+	if (err >= 0)
+		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
+	return err;
+}
+
+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos)
+{
+	ssize_t err;
+	mm_segment_t oldfs;
+
+	oldfs = get_fs();
+	set_fs(KERNEL_DS);
+	err = vfsub_write_u(file, (const char __user *)kbuf, count, ppos);
+	set_fs(oldfs);
+	return err;
+}
+
+int vfsub_readdir(struct file *file, filldir_t filldir, void *arg)
+{
+	int err;
+
+	lockdep_off();
+	err = vfs_readdir(file, filldir, arg);
+	lockdep_on();
+	if (err >= 0)
+		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
+	return err;
+}
+
+long vfsub_splice_to(struct file *in, loff_t *ppos,
+		     struct pipe_inode_info *pipe, size_t len,
+		     unsigned int flags)
+{
+	long err;
+
+	lockdep_off();
+	err = do_splice_to(in, ppos, pipe, len, flags);
+	lockdep_on();
+	if (err >= 0)
+		vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/
+	return err;
+}
+
+long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
+		       loff_t *ppos, size_t len, unsigned int flags)
+{
+	long err;
+
+	lockdep_off();
+	err = do_splice_from(pipe, out, ppos, len, flags);
+	lockdep_on();
+	if (err >= 0)
+		vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/
+	return err;
+}
+
+/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */
+int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
+		struct file *h_file)
+{
+	int err;
+	struct inode *h_inode;
+
+	h_inode = h_path->dentry->d_inode;
+	if (!h_file) {
+		err = mnt_want_write(h_path->mnt);
+		if (err)
+			goto out;
+		err = inode_permission(h_inode, MAY_WRITE);
+		if (err)
+			goto out_mnt;
+		err = get_write_access(h_inode);
+		if (err)
+			goto out_mnt;
+		err = break_lease(h_inode, vfsub_fmode_to_uint(FMODE_WRITE));
+		if (err)
+			goto out_inode;
+	}
+
+	err = locks_verify_truncate(h_inode, h_file, length);
+	if (!err)
+		err = security_path_truncate(h_path, length, attr);
+	if (!err) {
+		lockdep_off();
+		err = do_truncate(h_path->dentry, length, attr, h_file);
+		lockdep_on();
+	}
+
+ out_inode:
+	if (!h_file)
+		put_write_access(h_inode);
+ out_mnt:
+	if (!h_file)
+		mnt_drop_write(h_path->mnt);
+ out:
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct au_vfsub_mkdir_args {
+	int *errp;
+	struct inode *dir;
+	struct path *path;
+	int mode;
+};
+
+static void au_call_vfsub_mkdir(void *args)
+{
+	struct au_vfsub_mkdir_args *a = args;
+	*a->errp = vfsub_mkdir(a->dir, a->path, a->mode);
+}
+
+int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode)
+{
+	int err, do_sio, wkq_err;
+
+	do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
+	if (!do_sio)
+		err = vfsub_mkdir(dir, path, mode);
+	else {
+		struct au_vfsub_mkdir_args args = {
+			.errp	= &err,
+			.dir	= dir,
+			.path	= path,
+			.mode	= mode
+		};
+		wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args);
+		if (unlikely(wkq_err))
+			err = wkq_err;
+	}
+
+	return err;
+}
+
+struct au_vfsub_rmdir_args {
+	int *errp;
+	struct inode *dir;
+	struct path *path;
+};
+
+static void au_call_vfsub_rmdir(void *args)
+{
+	struct au_vfsub_rmdir_args *a = args;
+	*a->errp = vfsub_rmdir(a->dir, a->path);
+}
+
+int vfsub_sio_rmdir(struct inode *dir, struct path *path)
+{
+	int err, do_sio, wkq_err;
+
+	do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
+	if (!do_sio)
+		err = vfsub_rmdir(dir, path);
+	else {
+		struct au_vfsub_rmdir_args args = {
+			.errp	= &err,
+			.dir	= dir,
+			.path	= path
+		};
+		wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args);
+		if (unlikely(wkq_err))
+			err = wkq_err;
+	}
+
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct notify_change_args {
+	int *errp;
+	struct path *path;
+	struct iattr *ia;
+};
+
+static void call_notify_change(void *args)
+{
+	struct notify_change_args *a = args;
+	struct inode *h_inode;
+
+	h_inode = a->path->dentry->d_inode;
+	IMustLock(h_inode);
+
+	*a->errp = -EPERM;
+	if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) {
+		lockdep_off();
+		*a->errp = notify_change(a->path->dentry, a->ia);
+		lockdep_on();
+		if (!*a->errp)
+			vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/
+	}
+	AuTraceErr(*a->errp);
+}
+
+int vfsub_notify_change(struct path *path, struct iattr *ia)
+{
+	int err;
+	struct notify_change_args args = {
+		.errp	= &err,
+		.path	= path,
+		.ia	= ia
+	};
+
+	call_notify_change(&args);
+
+	return err;
+}
+
+int vfsub_sio_notify_change(struct path *path, struct iattr *ia)
+{
+	int err, wkq_err;
+	struct notify_change_args args = {
+		.errp	= &err,
+		.path	= path,
+		.ia	= ia
+	};
+
+	wkq_err = au_wkq_wait(call_notify_change, &args);
+	if (unlikely(wkq_err))
+		err = wkq_err;
+
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+struct unlink_args {
+	int *errp;
+	struct inode *dir;
+	struct path *path;
+};
+
+static void call_unlink(void *args)
+{
+	struct unlink_args *a = args;
+	struct dentry *d = a->path->dentry;
+	struct inode *h_inode;
+	const int stop_sillyrename = (au_test_nfs(d->d_sb)
+				      && atomic_read(&d->d_count) == 1);
+
+	IMustLock(a->dir);
+
+	a->path->dentry = d->d_parent;
+	*a->errp = security_path_unlink(a->path, d);
+	a->path->dentry = d;
+	if (unlikely(*a->errp))
+		return;
+
+	if (!stop_sillyrename)
+		dget(d);
+	h_inode = d->d_inode;
+	if (h_inode)
+		atomic_inc(&h_inode->i_count);
+
+	lockdep_off();
+	*a->errp = vfs_unlink(a->dir, d);
+	lockdep_on();
+	if (!*a->errp) {
+		struct path tmp = {
+			.dentry = d->d_parent,
+			.mnt	= a->path->mnt
+		};
+		vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
+	}
+
+	if (!stop_sillyrename)
+		dput(d);
+	if (h_inode)
+		iput(h_inode);
+
+	AuTraceErr(*a->errp);
+}
+
+/*
+ * @dir: must be locked.
+ * @dentry: target dentry.
+ */
+int vfsub_unlink(struct inode *dir, struct path *path, int force)
+{
+	int err;
+	struct unlink_args args = {
+		.errp	= &err,
+		.dir	= dir,
+		.path	= path
+	};
+
+	if (!force)
+		call_unlink(&args);
+	else {
+		int wkq_err;
+
+		wkq_err = au_wkq_wait(call_unlink, &args);
+		if (unlikely(wkq_err))
+			err = wkq_err;
+	}
+
+	return err;
+}
diff --git a/fs/aufs/vfsub.h b/fs/aufs/vfsub.h
new file mode 100644
index 0000000..a21e5a8
--- /dev/null
+++ b/fs/aufs/vfsub.h
@@ -0,0 +1,165 @@
+/*
+ * Copyright (C) 2005-2009 Junjiro R. Okajima
+ *
+ * This program, aufs is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+/*
+ * sub-routines for VFS
+ */
+
+#ifndef __AUFS_VFSUB_H__
+#define __AUFS_VFSUB_H__
+
+#ifdef __KERNEL__
+
+#include <linux/fs.h>
+#include <linux/fs_stack.h>
+#include <linux/namei.h>
+#include <linux/security.h>
+#include <linux/splice.h>
+
+/* ---------------------------------------------------------------------- */
+
+/* lock subclass for lower inode */
+/* default MAX_LOCKDEP_SUBCLASSES(8) is not enough */
+/* reduce? gave up. */
+enum {
+	AuLsc_I_Begin = I_MUTEX_QUOTA, /* 4 */
+	AuLsc_I_PARENT,		/* lower inode, parent first */
+	AuLsc_I_PARENT2,	/* copyup dirs */
+	AuLsc_I_CHILD,
+	AuLsc_I_CHILD2,
+	AuLsc_I_End
+};
+
+/* to debug easier, do not make them inlined functions */
+#define MtxMustLock(mtx)	AuDebugOn(!mutex_is_locked(mtx))
+#define IMustLock(i)		MtxMustLock(&(i)->i_mutex)
+
+/* ---------------------------------------------------------------------- */
+
+static inline void vfsub_copy_inode_size(struct inode *inode,
+					 struct inode *h_inode)
+{
+	spin_lock(&inode->i_lock);
+	fsstack_copy_inode_size(inode, h_inode);
+	spin_unlock(&inode->i_lock);
+}
+
+int vfsub_update_h_iattr(struct path *h_path, int *did);
+struct file *vfsub_filp_open(const char *path, int oflags, int mode);
+struct file *vfsub_dentry_open(struct dentry *parent, struct vfsmount *mnt,
+			       int flags, const struct cred *cred);
+int vfsub_kern_path(const char *name, unsigned int flags, struct path *path);
+struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
+				    int len);
+struct dentry *vfsub_lookup_hash(struct nameidata *nd);
+
+/* ---------------------------------------------------------------------- */
+
+struct au_hinode;
+struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
+				 struct dentry *d2, struct au_hinode *hdir2);
+void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
+			 struct dentry *d2, struct au_hinode *hdir2);
+
+int vfsub_create(struct inode *dir, struct path *path, int mode);
+int vfsub_symlink(struct inode *dir, struct path *path,
+		  const char *symname);
+int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev);
+int vfsub_link(struct dentry *src_dentry, struct inode *dir,
+	       struct path *path);
+int vfsub_rename(struct inode *src_hdir, struct dentry *src_dentry,
+		 struct inode *hdir, struct path *path);
+int vfsub_mkdir(struct inode *dir, struct path *path, int mode);
+int vfsub_rmdir(struct inode *dir, struct path *path);
+
+int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode);
+int vfsub_sio_rmdir(struct inode *dir, struct path *path);
+int vfsub_sio_notify_change(struct path *path, struct iattr *ia);
+int vfsub_notify_change(struct path *path, struct iattr *ia);
+int vfsub_unlink(struct inode *dir, struct path *path, int force);
+
+/* ---------------------------------------------------------------------- */
+
+ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
+		     loff_t *ppos);
+ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
+			loff_t *ppos);
+ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
+		      loff_t *ppos);
+ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count,
+		      loff_t *ppos);
+int vfsub_readdir(struct file *file, filldir_t filldir, void *arg);
+
+long vfsub_splice_to(struct file *in, loff_t *ppos,
+		     struct pipe_inode_info *pipe, size_t len,
+		     unsigned int flags);
+long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
+		       loff_t *ppos, size_t len, unsigned int flags);
+int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
+		struct file *h_file);
+
+static inline void vfsub_file_accessed(struct file *h_file)
+{
+	file_accessed(h_file);
+	vfsub_update_h_iattr(&h_file->f_path, /*did*/NULL); /*ignore*/
+}
+
+static inline void vfsub_touch_atime(struct vfsmount *h_mnt,
+				     struct dentry *h_dentry)
+{
+	struct path h_path = {
+		.dentry	= h_dentry,
+		.mnt	= h_mnt
+	};
+	touch_atime(h_mnt, h_dentry);
+	vfsub_update_h_iattr(&h_path, /*did*/NULL); /*ignore*/
+}
+
+/* ---------------------------------------------------------------------- */
+
+static inline loff_t vfsub_llseek(struct file *file, loff_t offset, int origin)
+{
+	loff_t err;
+
+	lockdep_off();
+	err = vfs_llseek(file, offset, origin);
+	lockdep_on();
+	return err;
+}
+
+/* ---------------------------------------------------------------------- */
+
+/* dirty workaround for strict type of fmode_t */
+union vfsub_fmu {
+	fmode_t fm;
+	unsigned int ui;
+};
+
+static inline unsigned int vfsub_fmode_to_uint(fmode_t fm)
+{
+	union vfsub_fmu u = {
+		.fm = fm
+	};
+
+	BUILD_BUG_ON(sizeof(u.fm) != sizeof(u.ui));
+
+	return u.ui;
+}
+
+static inline fmode_t vfsub_uint_to_fmode(unsigned int ui)
+{
+	union vfsub_fmu u = {
+		.ui = ui
+	};
+
+	return u.fm;
+}
+
+#endif /* __KERNEL__ */
+#endif /* __AUFS_VFSUB_H__ */
-- 
1.6.1.284.g5dc13

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