Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 3501 deletions

diff --git a/ANDROID_3.4.5/fs/namei.c b/ANDROID_3.4.5/fs/namei.c
deleted file mode 100644
index c4279191..00000000
--- a/ANDROID_3.4.5/fs/namei.c
+++ /dev/null
@@ -1,3501 +0,0 @@
-/*
- *  linux/fs/namei.c
- *
- *  Copyright (C) 1991, 1992  Linus Torvalds
- */
-
-/*
- * Some corrections by tytso.
- */
-
-/* [Feb 1997 T. Schoebel-Theuer] Complete rewrite of the pathname
- * lookup logic.
- */
-/* [Feb-Apr 2000, AV] Rewrite to the new namespace architecture.
- */
-
-#include <linux/init.h>
-#include <linux/export.h>
-#include <linux/slab.h>
-#include <linux/fs.h>
-#include <linux/namei.h>
-#include <linux/pagemap.h>
-#include <linux/fsnotify.h>
-#include <linux/personality.h>
-#include <linux/security.h>
-#include <linux/ima.h>
-#include <linux/syscalls.h>
-#include <linux/mount.h>
-#include <linux/audit.h>
-#include <linux/capability.h>
-#include <linux/file.h>
-#include <linux/fcntl.h>
-#include <linux/device_cgroup.h>
-#include <linux/fs_struct.h>
-#include <linux/posix_acl.h>
-#include <asm/uaccess.h>
-
-#include "internal.h"
-#include "mount.h"
-
-/* [Feb-1997 T. Schoebel-Theuer]
- * Fundamental changes in the pathname lookup mechanisms (namei)
- * were necessary because of omirr.  The reason is that omirr needs
- * to know the _real_ pathname, not the user-supplied one, in case
- * of symlinks (and also when transname replacements occur).
- *
- * The new code replaces the old recursive symlink resolution with
- * an iterative one (in case of non-nested symlink chains).  It does
- * this with calls to <fs>_follow_link().
- * As a side effect, dir_namei(), _namei() and follow_link() are now 
- * replaced with a single function lookup_dentry() that can handle all 
- * the special cases of the former code.
- *
- * With the new dcache, the pathname is stored at each inode, at least as
- * long as the refcount of the inode is positive.  As a side effect, the
- * size of the dcache depends on the inode cache and thus is dynamic.
- *
- * [29-Apr-1998 C. Scott Ananian] Updated above description of symlink
- * resolution to correspond with current state of the code.
- *
- * Note that the symlink resolution is not *completely* iterative.
- * There is still a significant amount of tail- and mid- recursion in
- * the algorithm.  Also, note that <fs>_readlink() is not used in
- * lookup_dentry(): lookup_dentry() on the result of <fs>_readlink()
- * may return different results than <fs>_follow_link().  Many virtual
- * filesystems (including /proc) exhibit this behavior.
- */
-
-/* [24-Feb-97 T. Schoebel-Theuer] Side effects caused by new implementation:
- * New symlink semantics: when open() is called with flags O_CREAT | O_EXCL
- * and the name already exists in form of a symlink, try to create the new
- * name indicated by the symlink. The old code always complained that the
- * name already exists, due to not following the symlink even if its target
- * is nonexistent.  The new semantics affects also mknod() and link() when
- * the name is a symlink pointing to a non-existent name.
- *
- * I don't know which semantics is the right one, since I have no access
- * to standards. But I found by trial that HP-UX 9.0 has the full "new"
- * semantics implemented, while SunOS 4.1.1 and Solaris (SunOS 5.4) have the
- * "old" one. Personally, I think the new semantics is much more logical.
- * Note that "ln old new" where "new" is a symlink pointing to a non-existing
- * file does succeed in both HP-UX and SunOs, but not in Solaris
- * and in the old Linux semantics.
- */
-
-/* [16-Dec-97 Kevin Buhr] For security reasons, we change some symlink
- * semantics.  See the comments in "open_namei" and "do_link" below.
- *
- * [10-Sep-98 Alan Modra] Another symlink change.
- */
-
-/* [Feb-Apr 2000 AV] Complete rewrite. Rules for symlinks:
- *	inside the path - always follow.
- *	in the last component in creation/removal/renaming - never follow.
- *	if LOOKUP_FOLLOW passed - follow.
- *	if the pathname has trailing slashes - follow.
- *	otherwise - don't follow.
- * (applied in that order).
- *
- * [Jun 2000 AV] Inconsistent behaviour of open() in case if flags==O_CREAT
- * restored for 2.4. This is the last surviving part of old 4.2BSD bug.
- * During the 2.4 we need to fix the userland stuff depending on it -
- * hopefully we will be able to get rid of that wart in 2.5. So far only
- * XEmacs seems to be relying on it...
- */
-/*
- * [Sep 2001 AV] Single-semaphore locking scheme (kudos to David Holland)
- * implemented.  Let's see if raised priority of ->s_vfs_rename_mutex gives
- * any extra contention...
- */
-
-/* In order to reduce some races, while at the same time doing additional
- * checking and hopefully speeding things up, we copy filenames to the
- * kernel data space before using them..
- *
- * POSIX.1 2.4: an empty pathname is invalid (ENOENT).
- * PATH_MAX includes the nul terminator --RR.
- */
-static int do_getname(const char __user *filename, char *page)
-{
-	int retval;
-	unsigned long len = PATH_MAX;
-
-	if (!segment_eq(get_fs(), KERNEL_DS)) {
-		if ((unsigned long) filename >= TASK_SIZE)
-			return -EFAULT;
-		if (TASK_SIZE - (unsigned long) filename < PATH_MAX)
-			len = TASK_SIZE - (unsigned long) filename;
-	}
-
-	retval = strncpy_from_user(page, filename, len);
-	if (retval > 0) {
-		if (retval < len)
-			return 0;
-		return -ENAMETOOLONG;
-	} else if (!retval)
-		retval = -ENOENT;
-	return retval;
-}
-
-static char *getname_flags(const char __user *filename, int flags, int *empty)
-{
-	char *result = __getname();
-	int retval;
-
-	if (!result)
-		return ERR_PTR(-ENOMEM);
-
-	retval = do_getname(filename, result);
-	if (retval < 0) {
-		if (retval == -ENOENT && empty)
-			*empty = 1;
-		if (retval != -ENOENT || !(flags & LOOKUP_EMPTY)) {
-			__putname(result);
-			return ERR_PTR(retval);
-		}
-	}
-	audit_getname(result);
-	return result;
-}
-
-char *getname(const char __user * filename)
-{
-	return getname_flags(filename, 0, NULL);
-}
-
-#ifdef CONFIG_AUDITSYSCALL
-void putname(const char *name)
-{
-	if (unlikely(!audit_dummy_context()))
-		audit_putname(name);
-	else
-		__putname(name);
-}
-EXPORT_SYMBOL(putname);
-#endif
-
-static int check_acl(struct inode *inode, int mask)
-{
-#ifdef CONFIG_FS_POSIX_ACL
-	struct posix_acl *acl;
-
-	if (mask & MAY_NOT_BLOCK) {
-		acl = get_cached_acl_rcu(inode, ACL_TYPE_ACCESS);
-	        if (!acl)
-	                return -EAGAIN;
-		/* no ->get_acl() calls in RCU mode... */
-		if (acl == ACL_NOT_CACHED)
-			return -ECHILD;
-	        return posix_acl_permission(inode, acl, mask & ~MAY_NOT_BLOCK);
-	}
-
-	acl = get_cached_acl(inode, ACL_TYPE_ACCESS);
-
-	/*
-	 * A filesystem can force a ACL callback by just never filling the
-	 * ACL cache. But normally you'd fill the cache either at inode
-	 * instantiation time, or on the first ->get_acl call.
-	 *
-	 * If the filesystem doesn't have a get_acl() function at all, we'll
-	 * just create the negative cache entry.
-	 */
-	if (acl == ACL_NOT_CACHED) {
-	        if (inode->i_op->get_acl) {
-			acl = inode->i_op->get_acl(inode, ACL_TYPE_ACCESS);
-			if (IS_ERR(acl))
-				return PTR_ERR(acl);
-		} else {
-		        set_cached_acl(inode, ACL_TYPE_ACCESS, NULL);
-		        return -EAGAIN;
-		}
-	}
-
-	if (acl) {
-	        int error = posix_acl_permission(inode, acl, mask);
-	        posix_acl_release(acl);
-	        return error;
-	}
-#endif
-
-	return -EAGAIN;
-}
-
-/*
- * This does the basic permission checking
- */
-static int acl_permission_check(struct inode *inode, int mask)
-{
-	unsigned int mode = inode->i_mode;
-
-	if (current_user_ns() != inode_userns(inode))
-		goto other_perms;
-
-	if (likely(current_fsuid() == inode->i_uid))
-		mode >>= 6;
-	else {
-		if (IS_POSIXACL(inode) && (mode & S_IRWXG)) {
-			int error = check_acl(inode, mask);
-			if (error != -EAGAIN)
-				return error;
-		}
-
-		if (in_group_p(inode->i_gid))
-			mode >>= 3;
-	}
-
-other_perms:
-	/*
-	 * If the DACs are ok we don't need any capability check.
-	 */
-	if ((mask & ~mode & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0)
-		return 0;
-	return -EACCES;
-}
-
-/**
- * generic_permission -  check for access rights on a Posix-like filesystem
- * @inode:	inode to check access rights for
- * @mask:	right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC, ...)
- *
- * Used to check for read/write/execute permissions on a file.
- * We use "fsuid" for this, letting us set arbitrary permissions
- * for filesystem access without changing the "normal" uids which
- * are used for other things.
- *
- * generic_permission is rcu-walk aware. It returns -ECHILD in case an rcu-walk
- * request cannot be satisfied (eg. requires blocking or too much complexity).
- * It would then be called again in ref-walk mode.
- */
-int generic_permission(struct inode *inode, int mask)
-{
-	int ret;
-
-	/*
-	 * Do the basic permission checks.
-	 */
-	ret = acl_permission_check(inode, mask);
-	if (ret != -EACCES)
-		return ret;
-
-	if (S_ISDIR(inode->i_mode)) {
-		/* DACs are overridable for directories */
-		if (ns_capable(inode_userns(inode), CAP_DAC_OVERRIDE))
-			return 0;
-		if (!(mask & MAY_WRITE))
-			if (ns_capable(inode_userns(inode), CAP_DAC_READ_SEARCH))
-				return 0;
-		return -EACCES;
-	}
-	/*
-	 * Read/write DACs are always overridable.
-	 * Executable DACs are overridable when there is
-	 * at least one exec bit set.
-	 */
-	if (!(mask & MAY_EXEC) || (inode->i_mode & S_IXUGO))
-		if (ns_capable(inode_userns(inode), CAP_DAC_OVERRIDE))
-			return 0;
-
-	/*
-	 * Searching includes executable on directories, else just read.
-	 */
-	mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
-	if (mask == MAY_READ)
-		if (ns_capable(inode_userns(inode), CAP_DAC_READ_SEARCH))
-			return 0;
-
-	return -EACCES;
-}
-
-/*
- * We _really_ want to just do "generic_permission()" without
- * even looking at the inode->i_op values. So we keep a cache
- * flag in inode->i_opflags, that says "this has not special
- * permission function, use the fast case".
- */
-static inline int do_inode_permission(struct inode *inode, int mask)
-{
-	if (unlikely(!(inode->i_opflags & IOP_FASTPERM))) {
-		if (likely(inode->i_op->permission))
-			return inode->i_op->permission(inode, mask);
-
-		/* This gets set once for the inode lifetime */
-		spin_lock(&inode->i_lock);
-		inode->i_opflags |= IOP_FASTPERM;
-		spin_unlock(&inode->i_lock);
-	}
-	return generic_permission(inode, mask);
-}
-
-/**
- * inode_permission  -  check for access rights to a given inode
- * @inode:	inode to check permission on
- * @mask:	right to check for (%MAY_READ, %MAY_WRITE, %MAY_EXEC, ...)
- *
- * Used to check for read/write/execute permissions on an inode.
- * We use "fsuid" for this, letting us set arbitrary permissions
- * for filesystem access without changing the "normal" uids which
- * are used for other things.
- *
- * When checking for MAY_APPEND, MAY_WRITE must also be set in @mask.
- */
-int inode_permission(struct inode *inode, int mask)
-{
-	int retval;
-
-	if (unlikely(mask & MAY_WRITE)) {
-		umode_t mode = inode->i_mode;
-
-		/*
-		 * Nobody gets write access to a read-only fs.
-		 */
-		if (IS_RDONLY(inode) &&
-		    (S_ISREG(mode) || S_ISDIR(mode) || S_ISLNK(mode)))
-			return -EROFS;
-
-		/*
-		 * Nobody gets write access to an immutable file.
-		 */
-		if (IS_IMMUTABLE(inode))
-			return -EACCES;
-	}
-
-	retval = do_inode_permission(inode, mask);
-	if (retval)
-		return retval;
-
-	retval = devcgroup_inode_permission(inode, mask);
-	if (retval)
-		return retval;
-
-	return security_inode_permission(inode, mask);
-}
-
-/**
- * path_get - get a reference to a path
- * @path: path to get the reference to
- *
- * Given a path increment the reference count to the dentry and the vfsmount.
- */
-void path_get(struct path *path)
-{
-	mntget(path->mnt);
-	dget(path->dentry);
-}
-EXPORT_SYMBOL(path_get);
-
-/**
- * path_put - put a reference to a path
- * @path: path to put the reference to
- *
- * Given a path decrement the reference count to the dentry and the vfsmount.
- */
-void path_put(struct path *path)
-{
-	dput(path->dentry);
-	mntput(path->mnt);
-}
-EXPORT_SYMBOL(path_put);
-
-/*
- * Path walking has 2 modes, rcu-walk and ref-walk (see
- * Documentation/filesystems/path-lookup.txt).  In situations when we can't
- * continue in RCU mode, we attempt to drop out of rcu-walk mode and grab
- * normal reference counts on dentries and vfsmounts to transition to rcu-walk
- * mode.  Refcounts are grabbed at the last known good point before rcu-walk
- * got stuck, so ref-walk may continue from there. If this is not successful
- * (eg. a seqcount has changed), then failure is returned and it's up to caller
- * to restart the path walk from the beginning in ref-walk mode.
- */
-
-/**
- * unlazy_walk - try to switch to ref-walk mode.
- * @nd: nameidata pathwalk data
- * @dentry: child of nd->path.dentry or NULL
- * Returns: 0 on success, -ECHILD on failure
- *
- * unlazy_walk attempts to legitimize the current nd->path, nd->root and dentry
- * for ref-walk mode.  @dentry must be a path found by a do_lookup call on
- * @nd or NULL.  Must be called from rcu-walk context.
- */
-static int unlazy_walk(struct nameidata *nd, struct dentry *dentry)
-{
-	struct fs_struct *fs = current->fs;
-	struct dentry *parent = nd->path.dentry;
-	int want_root = 0;
-
-	BUG_ON(!(nd->flags & LOOKUP_RCU));
-	if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) {
-		want_root = 1;
-		spin_lock(&fs->lock);
-		if (nd->root.mnt != fs->root.mnt ||
-				nd->root.dentry != fs->root.dentry)
-			goto err_root;
-	}
-	spin_lock(&parent->d_lock);
-	if (!dentry) {
-		if (!__d_rcu_to_refcount(parent, nd->seq))
-			goto err_parent;
-		BUG_ON(nd->inode != parent->d_inode);
-	} else {
-		if (dentry->d_parent != parent)
-			goto err_parent;
-		spin_lock_nested(&dentry->d_lock, DENTRY_D_LOCK_NESTED);
-		if (!__d_rcu_to_refcount(dentry, nd->seq))
-			goto err_child;
-		/*
-		 * If the sequence check on the child dentry passed, then
-		 * the child has not been removed from its parent. This
-		 * means the parent dentry must be valid and able to take
-		 * a reference at this point.
-		 */
-		BUG_ON(!IS_ROOT(dentry) && dentry->d_parent != parent);
-		BUG_ON(!parent->d_count);
-		parent->d_count++;
-		spin_unlock(&dentry->d_lock);
-	}
-	spin_unlock(&parent->d_lock);
-	if (want_root) {
-		path_get(&nd->root);
-		spin_unlock(&fs->lock);
-	}
-	mntget(nd->path.mnt);
-
-	rcu_read_unlock();
-	br_read_unlock(vfsmount_lock);
-	nd->flags &= ~LOOKUP_RCU;
-	return 0;
-
-err_child:
-	spin_unlock(&dentry->d_lock);
-err_parent:
-	spin_unlock(&parent->d_lock);
-err_root:
-	if (want_root)
-		spin_unlock(&fs->lock);
-	return -ECHILD;
-}
-
-/**
- * release_open_intent - free up open intent resources
- * @nd: pointer to nameidata
- */
-void release_open_intent(struct nameidata *nd)
-{
-	struct file *file = nd->intent.open.file;
-
-	if (file && !IS_ERR(file)) {
-		if (file->f_path.dentry == NULL)
-			put_filp(file);
-		else
-			fput(file);
-	}
-}
-
-static inline int d_revalidate(struct dentry *dentry, struct nameidata *nd)
-{
-	return dentry->d_op->d_revalidate(dentry, nd);
-}
-
-/**
- * complete_walk - successful completion of path walk
- * @nd:  pointer nameidata
- *
- * If we had been in RCU mode, drop out of it and legitimize nd->path.
- * Revalidate the final result, unless we'd already done that during
- * the path walk or the filesystem doesn't ask for it.  Return 0 on
- * success, -error on failure.  In case of failure caller does not
- * need to drop nd->path.
- */
-static int complete_walk(struct nameidata *nd)
-{
-	struct dentry *dentry = nd->path.dentry;
-	int status;
-
-	if (nd->flags & LOOKUP_RCU) {
-		nd->flags &= ~LOOKUP_RCU;
-		if (!(nd->flags & LOOKUP_ROOT))
-			nd->root.mnt = NULL;
-		spin_lock(&dentry->d_lock);
-		if (unlikely(!__d_rcu_to_refcount(dentry, nd->seq))) {
-			spin_unlock(&dentry->d_lock);
-			rcu_read_unlock();
-			br_read_unlock(vfsmount_lock);
-			return -ECHILD;
-		}
-		BUG_ON(nd->inode != dentry->d_inode);
-		spin_unlock(&dentry->d_lock);
-		mntget(nd->path.mnt);
-		rcu_read_unlock();
-		br_read_unlock(vfsmount_lock);
-	}
-
-	if (likely(!(nd->flags & LOOKUP_JUMPED)))
-		return 0;
-
-	if (likely(!(dentry->d_flags & DCACHE_OP_REVALIDATE)))
-		return 0;
-
-	if (likely(!(dentry->d_sb->s_type->fs_flags & FS_REVAL_DOT)))
-		return 0;
-
-	/* Note: we do not d_invalidate() */
-	status = d_revalidate(dentry, nd);
-	if (status > 0)
-		return 0;
-
-	if (!status)
-		status = -ESTALE;
-
-	path_put(&nd->path);
-	return status;
-}
-
-static __always_inline void set_root(struct nameidata *nd)
-{
-	if (!nd->root.mnt)
-		get_fs_root(current->fs, &nd->root);
-}
-
-static int link_path_walk(const char *, struct nameidata *);
-
-static __always_inline void set_root_rcu(struct nameidata *nd)
-{
-	if (!nd->root.mnt) {
-		struct fs_struct *fs = current->fs;
-		unsigned seq;
-
-		do {
-			seq = read_seqcount_begin(&fs->seq);
-			nd->root = fs->root;
-			nd->seq = __read_seqcount_begin(&nd->root.dentry->d_seq);
-		} while (read_seqcount_retry(&fs->seq, seq));
-	}
-}
-
-static __always_inline int __vfs_follow_link(struct nameidata *nd, const char *link)
-{
-	int ret;
-
-	if (IS_ERR(link))
-		goto fail;
-
-	if (*link == '/') {
-		set_root(nd);
-		path_put(&nd->path);
-		nd->path = nd->root;
-		path_get(&nd->root);
-		nd->flags |= LOOKUP_JUMPED;
-	}
-	nd->inode = nd->path.dentry->d_inode;
-
-	ret = link_path_walk(link, nd);
-	return ret;
-fail:
-	path_put(&nd->path);
-	return PTR_ERR(link);
-}
-
-static void path_put_conditional(struct path *path, struct nameidata *nd)
-{
-	dput(path->dentry);
-	if (path->mnt != nd->path.mnt)
-		mntput(path->mnt);
-}
-
-static inline void path_to_nameidata(const struct path *path,
-					struct nameidata *nd)
-{
-	if (!(nd->flags & LOOKUP_RCU)) {
-		dput(nd->path.dentry);
-		if (nd->path.mnt != path->mnt)
-			mntput(nd->path.mnt);
-	}
-	nd->path.mnt = path->mnt;
-	nd->path.dentry = path->dentry;
-}
-
-static inline void put_link(struct nameidata *nd, struct path *link, void *cookie)
-{
-	struct inode *inode = link->dentry->d_inode;
-	if (!IS_ERR(cookie) && inode->i_op->put_link)
-		inode->i_op->put_link(link->dentry, nd, cookie);
-	path_put(link);
-}
-
-static __always_inline int
-follow_link(struct path *link, struct nameidata *nd, void **p)
-{
-	int error;
-	struct dentry *dentry = link->dentry;
-
-	BUG_ON(nd->flags & LOOKUP_RCU);
-
-	if (link->mnt == nd->path.mnt)
-		mntget(link->mnt);
-
-	if (unlikely(current->total_link_count >= 40)) {
-		*p = ERR_PTR(-ELOOP); /* no ->put_link(), please */
-		path_put(&nd->path);
-		return -ELOOP;
-	}
-	cond_resched();
-	current->total_link_count++;
-
-	touch_atime(link);
-	nd_set_link(nd, NULL);
-
-	error = security_inode_follow_link(link->dentry, nd);
-	if (error) {
-		*p = ERR_PTR(error); /* no ->put_link(), please */
-		path_put(&nd->path);
-		return error;
-	}
-
-	nd->last_type = LAST_BIND;
-	*p = dentry->d_inode->i_op->follow_link(dentry, nd);
-	error = PTR_ERR(*p);
-	if (!IS_ERR(*p)) {
-		char *s = nd_get_link(nd);
-		error = 0;
-		if (s)
-			error = __vfs_follow_link(nd, s);
-		else if (nd->last_type == LAST_BIND) {
-			nd->flags |= LOOKUP_JUMPED;
-			nd->inode = nd->path.dentry->d_inode;
-			if (nd->inode->i_op->follow_link) {
-				/* stepped on a _really_ weird one */
-				path_put(&nd->path);
-				error = -ELOOP;
-			}
-		}
-	}
-	return error;
-}
-
-static int follow_up_rcu(struct path *path)
-{
-	struct mount *mnt = real_mount(path->mnt);
-	struct mount *parent;
-	struct dentry *mountpoint;
-
-	parent = mnt->mnt_parent;
-	if (&parent->mnt == path->mnt)
-		return 0;
-	mountpoint = mnt->mnt_mountpoint;
-	path->dentry = mountpoint;
-	path->mnt = &parent->mnt;
-	return 1;
-}
-
-int follow_up(struct path *path)
-{
-	struct mount *mnt = real_mount(path->mnt);
-	struct mount *parent;
-	struct dentry *mountpoint;
-
-	br_read_lock(vfsmount_lock);
-	parent = mnt->mnt_parent;
-	if (&parent->mnt == path->mnt) {
-		br_read_unlock(vfsmount_lock);
-		return 0;
-	}
-	mntget(&parent->mnt);
-	mountpoint = dget(mnt->mnt_mountpoint);
-	br_read_unlock(vfsmount_lock);
-	dput(path->dentry);
-	path->dentry = mountpoint;
-	mntput(path->mnt);
-	path->mnt = &parent->mnt;
-	return 1;
-}
-
-/*
- * Perform an automount
- * - return -EISDIR to tell follow_managed() to stop and return the path we
- *   were called with.
- */
-static int follow_automount(struct path *path, unsigned flags,
-			    bool *need_mntput)
-{
-	struct vfsmount *mnt;
-	int err;
-
-	if (!path->dentry->d_op || !path->dentry->d_op->d_automount)
-		return -EREMOTE;
-
-	/* We don't want to mount if someone's just doing a stat -
-	 * unless they're stat'ing a directory and appended a '/' to
-	 * the name.
-	 *
-	 * We do, however, want to mount if someone wants to open or
-	 * create a file of any type under the mountpoint, wants to
-	 * traverse through the mountpoint or wants to open the
-	 * mounted directory.  Also, autofs may mark negative dentries
-	 * as being automount points.  These will need the attentions
-	 * of the daemon to instantiate them before they can be used.
-	 */
-	if (!(flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY |
-		     LOOKUP_OPEN | LOOKUP_CREATE | LOOKUP_AUTOMOUNT)) &&
-	    path->dentry->d_inode)
-		return -EISDIR;
-
-	current->total_link_count++;
-	if (current->total_link_count >= 40)
-		return -ELOOP;
-
-	mnt = path->dentry->d_op->d_automount(path);
-	if (IS_ERR(mnt)) {
-		/*
-		 * The filesystem is allowed to return -EISDIR here to indicate
-		 * it doesn't want to automount.  For instance, autofs would do
-		 * this so that its userspace daemon can mount on this dentry.
-		 *
-		 * However, we can only permit this if it's a terminal point in
-		 * the path being looked up; if it wasn't then the remainder of
-		 * the path is inaccessible and we should say so.
-		 */
-		if (PTR_ERR(mnt) == -EISDIR && (flags & LOOKUP_PARENT))
-			return -EREMOTE;
-		return PTR_ERR(mnt);
-	}
-
-	if (!mnt) /* mount collision */
-		return 0;
-
-	if (!*need_mntput) {
-		/* lock_mount() may release path->mnt on error */
-		mntget(path->mnt);
-		*need_mntput = true;
-	}
-	err = finish_automount(mnt, path);
-
-	switch (err) {
-	case -EBUSY:
-		/* Someone else made a mount here whilst we were busy */
-		return 0;
-	case 0:
-		path_put(path);
-		path->mnt = mnt;
-		path->dentry = dget(mnt->mnt_root);
-		return 0;
-	default:
-		return err;
-	}
-
-}
-
-/*
- * Handle a dentry that is managed in some way.
- * - Flagged for transit management (autofs)
- * - Flagged as mountpoint
- * - Flagged as automount point
- *
- * This may only be called in refwalk mode.
- *
- * Serialization is taken care of in namespace.c
- */
-static int follow_managed(struct path *path, unsigned flags)
-{
-	struct vfsmount *mnt = path->mnt; /* held by caller, must be left alone */
-	unsigned managed;
-	bool need_mntput = false;
-	int ret = 0;
-
-	/* Given that we're not holding a lock here, we retain the value in a
-	 * local variable for each dentry as we look at it so that we don't see
-	 * the components of that value change under us */
-	while (managed = ACCESS_ONCE(path->dentry->d_flags),
-	       managed &= DCACHE_MANAGED_DENTRY,
-	       unlikely(managed != 0)) {
-		/* Allow the filesystem to manage the transit without i_mutex
-		 * being held. */
-		if (managed & DCACHE_MANAGE_TRANSIT) {
-			BUG_ON(!path->dentry->d_op);
-			BUG_ON(!path->dentry->d_op->d_manage);
-			ret = path->dentry->d_op->d_manage(path->dentry, false);
-			if (ret < 0)
-				break;
-		}
-
-		/* Transit to a mounted filesystem. */
-		if (managed & DCACHE_MOUNTED) {
-			struct vfsmount *mounted = lookup_mnt(path);
-			if (mounted) {
-				dput(path->dentry);
-				if (need_mntput)
-					mntput(path->mnt);
-				path->mnt = mounted;
-				path->dentry = dget(mounted->mnt_root);
-				need_mntput = true;
-				continue;
-			}
-
-			/* Something is mounted on this dentry in another
-			 * namespace and/or whatever was mounted there in this
-			 * namespace got unmounted before we managed to get the
-			 * vfsmount_lock */
-		}
-
-		/* Handle an automount point */
-		if (managed & DCACHE_NEED_AUTOMOUNT) {
-			ret = follow_automount(path, flags, &need_mntput);
-			if (ret < 0)
-				break;
-			continue;
-		}
-
-		/* We didn't change the current path point */
-		break;
-	}
-
-	if (need_mntput && path->mnt == mnt)
-		mntput(path->mnt);
-	if (ret == -EISDIR)
-		ret = 0;
-	return ret < 0 ? ret : need_mntput;
-}
-
-int follow_down_one(struct path *path)
-{
-	struct vfsmount *mounted;
-
-	mounted = lookup_mnt(path);
-	if (mounted) {
-		dput(path->dentry);
-		mntput(path->mnt);
-		path->mnt = mounted;
-		path->dentry = dget(mounted->mnt_root);
-		return 1;
-	}
-	return 0;
-}
-
-static inline bool managed_dentry_might_block(struct dentry *dentry)
-{
-	return (dentry->d_flags & DCACHE_MANAGE_TRANSIT &&
-		dentry->d_op->d_manage(dentry, true) < 0);
-}
-
-/*
- * Try to skip to top of mountpoint pile in rcuwalk mode.  Fail if
- * we meet a managed dentry that would need blocking.
- */
-static bool __follow_mount_rcu(struct nameidata *nd, struct path *path,
-			       struct inode **inode)
-{
-	for (;;) {
-		struct mount *mounted;
-		/*
-		 * Don't forget we might have a non-mountpoint managed dentry
-		 * that wants to block transit.
-		 */
-		if (unlikely(managed_dentry_might_block(path->dentry)))
-			return false;
-
-		if (!d_mountpoint(path->dentry))
-			break;
-
-		mounted = __lookup_mnt(path->mnt, path->dentry, 1);
-		if (!mounted)
-			break;
-		path->mnt = &mounted->mnt;
-		path->dentry = mounted->mnt.mnt_root;
-		nd->flags |= LOOKUP_JUMPED;
-		nd->seq = read_seqcount_begin(&path->dentry->d_seq);
-		/*
-		 * Update the inode too. We don't need to re-check the
-		 * dentry sequence number here after this d_inode read,
-		 * because a mount-point is always pinned.
-		 */
-		*inode = path->dentry->d_inode;
-	}
-	return true;
-}
-
-static void follow_mount_rcu(struct nameidata *nd)
-{
-	while (d_mountpoint(nd->path.dentry)) {
-		struct mount *mounted;
-		mounted = __lookup_mnt(nd->path.mnt, nd->path.dentry, 1);
-		if (!mounted)
-			break;
-		nd->path.mnt = &mounted->mnt;
-		nd->path.dentry = mounted->mnt.mnt_root;
-		nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
-	}
-}
-
-static int follow_dotdot_rcu(struct nameidata *nd)
-{
-	set_root_rcu(nd);
-
-	while (1) {
-		if (nd->path.dentry == nd->root.dentry &&
-		    nd->path.mnt == nd->root.mnt) {
-			break;
-		}
-		if (nd->path.dentry != nd->path.mnt->mnt_root) {
-			struct dentry *old = nd->path.dentry;
-			struct dentry *parent = old->d_parent;
-			unsigned seq;
-
-			seq = read_seqcount_begin(&parent->d_seq);
-			if (read_seqcount_retry(&old->d_seq, nd->seq))
-				goto failed;
-			nd->path.dentry = parent;
-			nd->seq = seq;
-			break;
-		}
-		if (!follow_up_rcu(&nd->path))
-			break;
-		nd->seq = read_seqcount_begin(&nd->path.dentry->d_seq);
-	}
-	follow_mount_rcu(nd);
-	nd->inode = nd->path.dentry->d_inode;
-	return 0;
-
-failed:
-	nd->flags &= ~LOOKUP_RCU;
-	if (!(nd->flags & LOOKUP_ROOT))
-		nd->root.mnt = NULL;
-	rcu_read_unlock();
-	br_read_unlock(vfsmount_lock);
-	return -ECHILD;
-}
-
-/*
- * Follow down to the covering mount currently visible to userspace.  At each
- * point, the filesystem owning that dentry may be queried as to whether the
- * caller is permitted to proceed or not.
- */
-int follow_down(struct path *path)
-{
-	unsigned managed;
-	int ret;
-
-	while (managed = ACCESS_ONCE(path->dentry->d_flags),
-	       unlikely(managed & DCACHE_MANAGED_DENTRY)) {
-		/* Allow the filesystem to manage the transit without i_mutex
-		 * being held.
-		 *
-		 * We indicate to the filesystem if someone is trying to mount
-		 * something here.  This gives autofs the chance to deny anyone
-		 * other than its daemon the right to mount on its
-		 * superstructure.
-		 *
-		 * The filesystem may sleep at this point.
-		 */
-		if (managed & DCACHE_MANAGE_TRANSIT) {
-			BUG_ON(!path->dentry->d_op);
-			BUG_ON(!path->dentry->d_op->d_manage);
-			ret = path->dentry->d_op->d_manage(
-				path->dentry, false);
-			if (ret < 0)
-				return ret == -EISDIR ? 0 : ret;
-		}
-
-		/* Transit to a mounted filesystem. */
-		if (managed & DCACHE_MOUNTED) {
-			struct vfsmount *mounted = lookup_mnt(path);
-			if (!mounted)
-				break;
-			dput(path->dentry);
-			mntput(path->mnt);
-			path->mnt = mounted;
-			path->dentry = dget(mounted->mnt_root);
-			continue;
-		}
-
-		/* Don't handle automount points here */
-		break;
-	}
-	return 0;
-}
-
-/*
- * Skip to top of mountpoint pile in refwalk mode for follow_dotdot()
- */
-static void follow_mount(struct path *path)
-{
-	while (d_mountpoint(path->dentry)) {
-		struct vfsmount *mounted = lookup_mnt(path);
-		if (!mounted)
-			break;
-		dput(path->dentry);
-		mntput(path->mnt);
-		path->mnt = mounted;
-		path->dentry = dget(mounted->mnt_root);
-	}
-}
-
-static void follow_dotdot(struct nameidata *nd)
-{
-	set_root(nd);
-
-	while(1) {
-		struct dentry *old = nd->path.dentry;
-
-		if (nd->path.dentry == nd->root.dentry &&
-		    nd->path.mnt == nd->root.mnt) {
-			break;
-		}
-		if (nd->path.dentry != nd->path.mnt->mnt_root) {
-			/* rare case of legitimate dget_parent()... */
-			nd->path.dentry = dget_parent(nd->path.dentry);
-			dput(old);
-			break;
-		}
-		if (!follow_up(&nd->path))
-			break;
-	}
-	follow_mount(&nd->path);
-	nd->inode = nd->path.dentry->d_inode;
-}
-
-/*
- * This looks up the name in dcache, possibly revalidates the old dentry and
- * allocates a new one if not found or not valid.  In the need_lookup argument
- * returns whether i_op->lookup is necessary.
- *
- * dir->d_inode->i_mutex must be held
- */
-static struct dentry *lookup_dcache(struct qstr *name, struct dentry *dir,
-				    struct nameidata *nd, bool *need_lookup)
-{
-	struct dentry *dentry;
-	int error;
-
-	*need_lookup = false;
-	dentry = d_lookup(dir, name);
-	if (dentry) {
-		if (d_need_lookup(dentry)) {
-			*need_lookup = true;
-		} else if (dentry->d_flags & DCACHE_OP_REVALIDATE) {
-			error = d_revalidate(dentry, nd);
-			if (unlikely(error <= 0)) {
-				if (error < 0) {
-					dput(dentry);
-					return ERR_PTR(error);
-				} else if (!d_invalidate(dentry)) {
-					dput(dentry);
-					dentry = NULL;
-				}
-			}
-		}
-	}
-
-	if (!dentry) {
-		dentry = d_alloc(dir, name);
-		if (unlikely(!dentry))
-			return ERR_PTR(-ENOMEM);
-
-		*need_lookup = true;
-	}
-	return dentry;
-}
-
-/*
- * Call i_op->lookup on the dentry.  The dentry must be negative but may be
- * hashed if it was pouplated with DCACHE_NEED_LOOKUP.
- *
- * dir->d_inode->i_mutex must be held
- */
-static struct dentry *lookup_real(struct inode *dir, struct dentry *dentry,
-				  struct nameidata *nd)
-{
-	struct dentry *old;
-
-	/* Don't create child dentry for a dead directory. */
-	if (unlikely(IS_DEADDIR(dir))) {
-		dput(dentry);
-		return ERR_PTR(-ENOENT);
-	}
-
-	old = dir->i_op->lookup(dir, dentry, nd);
-	if (unlikely(old)) {
-		dput(dentry);
-		dentry = old;
-	}
-	return dentry;
-}
-
-static struct dentry *__lookup_hash(struct qstr *name,
-		struct dentry *base, struct nameidata *nd)
-{
-	bool need_lookup;
-	struct dentry *dentry;
-
-	dentry = lookup_dcache(name, base, nd, &need_lookup);
-	if (!need_lookup)
-		return dentry;
-
-	return lookup_real(base->d_inode, dentry, nd);
-}
-
-/*
- *  It's more convoluted than I'd like it to be, but... it's still fairly
- *  small and for now I'd prefer to have fast path as straight as possible.
- *  It _is_ time-critical.
- */
-static int do_lookup(struct nameidata *nd, struct qstr *name,
-			struct path *path, struct inode **inode)
-{
-	struct vfsmount *mnt = nd->path.mnt;
-	struct dentry *dentry, *parent = nd->path.dentry;
-	int need_reval = 1;
-	int status = 1;
-	int err;
-
-	/*
-	 * Rename seqlock is not required here because in the off chance
-	 * of a false negative due to a concurrent rename, we're going to
-	 * do the non-racy lookup, below.
-	 */
-	if (nd->flags & LOOKUP_RCU) {
-		unsigned seq;
-		*inode = nd->inode;
-		dentry = __d_lookup_rcu(parent, name, &seq, inode);
-		if (!dentry)
-			goto unlazy;
-
-		/* Memory barrier in read_seqcount_begin of child is enough */
-		if (__read_seqcount_retry(&parent->d_seq, nd->seq))
-			return -ECHILD;
-		nd->seq = seq;
-
-		if (unlikely(d_need_lookup(dentry)))
-			goto unlazy;
-		if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE)) {
-			status = d_revalidate(dentry, nd);
-			if (unlikely(status <= 0)) {
-				if (status != -ECHILD)
-					need_reval = 0;
-				goto unlazy;
-			}
-		}
-		path->mnt = mnt;
-		path->dentry = dentry;
-		if (unlikely(!__follow_mount_rcu(nd, path, inode)))
-			goto unlazy;
-		if (unlikely(path->dentry->d_flags & DCACHE_NEED_AUTOMOUNT))
-			goto unlazy;
-		return 0;
-unlazy:
-		if (unlazy_walk(nd, dentry))
-			return -ECHILD;
-	} else {
-		dentry = __d_lookup(parent, name);
-	}
-
-	if (unlikely(!dentry))
-		goto need_lookup;
-
-	if (unlikely(d_need_lookup(dentry))) {
-		dput(dentry);
-		goto need_lookup;
-	}
-
-	if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE) && need_reval)
-		status = d_revalidate(dentry, nd);
-	if (unlikely(status <= 0)) {
-		if (status < 0) {
-			dput(dentry);
-			return status;
-		}
-		if (!d_invalidate(dentry)) {
-			dput(dentry);
-			goto need_lookup;
-		}
-	}
-done:
-	path->mnt = mnt;
-	path->dentry = dentry;
-	err = follow_managed(path, nd->flags);
-	if (unlikely(err < 0)) {
-		path_put_conditional(path, nd);
-		return err;
-	}
-	if (err)
-		nd->flags |= LOOKUP_JUMPED;
-	*inode = path->dentry->d_inode;
-	return 0;
-
-need_lookup:
-	BUG_ON(nd->inode != parent->d_inode);
-
-	mutex_lock(&parent->d_inode->i_mutex);
-	dentry = __lookup_hash(name, parent, nd);
-	mutex_unlock(&parent->d_inode->i_mutex);
-	if (IS_ERR(dentry))
-		return PTR_ERR(dentry);
-	goto done;
-}
-
-static inline int may_lookup(struct nameidata *nd)
-{
-	if (nd->flags & LOOKUP_RCU) {
-		int err = inode_permission(nd->inode, MAY_EXEC|MAY_NOT_BLOCK);
-		if (err != -ECHILD)
-			return err;
-		if (unlazy_walk(nd, NULL))
-			return -ECHILD;
-	}
-	return inode_permission(nd->inode, MAY_EXEC);
-}
-
-static inline int handle_dots(struct nameidata *nd, int type)
-{
-	if (type == LAST_DOTDOT) {
-		if (nd->flags & LOOKUP_RCU) {
-			if (follow_dotdot_rcu(nd))
-				return -ECHILD;
-		} else
-			follow_dotdot(nd);
-	}
-	return 0;
-}
-
-static void terminate_walk(struct nameidata *nd)
-{
-	if (!(nd->flags & LOOKUP_RCU)) {
-		path_put(&nd->path);
-	} else {
-		nd->flags &= ~LOOKUP_RCU;
-		if (!(nd->flags & LOOKUP_ROOT))
-			nd->root.mnt = NULL;
-		rcu_read_unlock();
-		br_read_unlock(vfsmount_lock);
-	}
-}
-
-/*
- * Do we need to follow links? We _really_ want to be able
- * to do this check without having to look at inode->i_op,
- * so we keep a cache of "no, this doesn't need follow_link"
- * for the common case.
- */
-static inline int should_follow_link(struct inode *inode, int follow)
-{
-	if (unlikely(!(inode->i_opflags & IOP_NOFOLLOW))) {
-		if (likely(inode->i_op->follow_link))
-			return follow;
-
-		/* This gets set once for the inode lifetime */
-		spin_lock(&inode->i_lock);
-		inode->i_opflags |= IOP_NOFOLLOW;
-		spin_unlock(&inode->i_lock);
-	}
-	return 0;
-}
-
-static inline int walk_component(struct nameidata *nd, struct path *path,
-		struct qstr *name, int type, int follow)
-{
-	struct inode *inode;
-	int err;
-	/*
-	 * "." and ".." are special - ".." especially so because it has
-	 * to be able to know about the current root directory and
-	 * parent relationships.
-	 */
-	if (unlikely(type != LAST_NORM))
-		return handle_dots(nd, type);
-	err = do_lookup(nd, name, path, &inode);
-	if (unlikely(err)) {
-		terminate_walk(nd);
-		return err;
-	}
-	if (!inode) {
-		path_to_nameidata(path, nd);
-		terminate_walk(nd);
-		return -ENOENT;
-	}
-	if (should_follow_link(inode, follow)) {
-		if (nd->flags & LOOKUP_RCU) {
-			if (unlikely(unlazy_walk(nd, path->dentry))) {
-				terminate_walk(nd);
-				return -ECHILD;
-			}
-		}
-		BUG_ON(inode != path->dentry->d_inode);
-		return 1;
-	}
-	path_to_nameidata(path, nd);
-	nd->inode = inode;
-	return 0;
-}
-
-/*
- * This limits recursive symlink follows to 8, while
- * limiting consecutive symlinks to 40.
- *
- * Without that kind of total limit, nasty chains of consecutive
- * symlinks can cause almost arbitrarily long lookups.
- */
-static inline int nested_symlink(struct path *path, struct nameidata *nd)
-{
-	int res;
-
-	if (unlikely(current->link_count >= MAX_NESTED_LINKS)) {
-		path_put_conditional(path, nd);
-		path_put(&nd->path);
-		return -ELOOP;
-	}
-	BUG_ON(nd->depth >= MAX_NESTED_LINKS);
-
-	nd->depth++;
-	current->link_count++;
-
-	do {
-		struct path link = *path;
-		void *cookie;
-
-		res = follow_link(&link, nd, &cookie);
-		if (!res)
-			res = walk_component(nd, path, &nd->last,
-					     nd->last_type, LOOKUP_FOLLOW);
-		put_link(nd, &link, cookie);
-	} while (res > 0);
-
-	current->link_count--;
-	nd->depth--;
-	return res;
-}
-
-/*
- * We really don't want to look at inode->i_op->lookup
- * when we don't have to. So we keep a cache bit in
- * the inode ->i_opflags field that says "yes, we can
- * do lookup on this inode".
- */
-static inline int can_lookup(struct inode *inode)
-{
-	if (likely(inode->i_opflags & IOP_LOOKUP))
-		return 1;
-	if (likely(!inode->i_op->lookup))
-		return 0;
-
-	/* We do this once for the lifetime of the inode */
-	spin_lock(&inode->i_lock);
-	inode->i_opflags |= IOP_LOOKUP;
-	spin_unlock(&inode->i_lock);
-	return 1;
-}
-
-/*
- * We can do the critical dentry name comparison and hashing
- * operations one word at a time, but we are limited to:
- *
- * - Architectures with fast unaligned word accesses. We could
- *   do a "get_unaligned()" if this helps and is sufficiently
- *   fast.
- *
- * - Little-endian machines (so that we can generate the mask
- *   of low bytes efficiently). Again, we *could* do a byte
- *   swapping load on big-endian architectures if that is not
- *   expensive enough to make the optimization worthless.
- *
- * - non-CONFIG_DEBUG_PAGEALLOC configurations (so that we
- *   do not trap on the (extremely unlikely) case of a page
- *   crossing operation.
- *
- * - Furthermore, we need an efficient 64-bit compile for the
- *   64-bit case in order to generate the "number of bytes in
- *   the final mask". Again, that could be replaced with a
- *   efficient population count instruction or similar.
- */
-#ifdef CONFIG_DCACHE_WORD_ACCESS
-
-#include <asm/word-at-a-time.h>
-
-#ifdef CONFIG_64BIT
-
-static inline unsigned int fold_hash(unsigned long hash)
-{
-	hash += hash >> (8*sizeof(int));
-	return hash;
-}
-
-#else	/* 32-bit case */
-
-#define fold_hash(x) (x)
-
-#endif
-
-unsigned int full_name_hash(const unsigned char *name, unsigned int len)
-{
-	unsigned long a, mask;
-	unsigned long hash = 0;
-
-	for (;;) {
-		a = load_unaligned_zeropad(name);
-		if (len < sizeof(unsigned long))
-			break;
-		hash += a;
-		hash *= 9;
-		name += sizeof(unsigned long);
-		len -= sizeof(unsigned long);
-		if (!len)
-			goto done;
-	}
-	mask = ~(~0ul << len*8);
-	hash += mask & a;
-done:
-	return fold_hash(hash);
-}
-EXPORT_SYMBOL(full_name_hash);
-
-/*
- * Calculate the length and hash of the path component, and
- * return the length of the component;
- */
-static inline unsigned long hash_name(const char *name, unsigned int *hashp)
-{
-	unsigned long a, mask, hash, len;
-
-	hash = a = 0;
-	len = -sizeof(unsigned long);
-	do {
-		hash = (hash + a) * 9;
-		len += sizeof(unsigned long);
-		a = load_unaligned_zeropad(name+len);
-		/* Do we have any NUL or '/' bytes in this word? */
-		mask = has_zero(a) | has_zero(a ^ REPEAT_BYTE('/'));
-	} while (!mask);
-
-	/* The mask *below* the first high bit set */
-	mask = (mask - 1) & ~mask;
-	mask >>= 7;
-	hash += a & mask;
-	*hashp = fold_hash(hash);
-
-	return len + count_masked_bytes(mask);
-}
-
-#else
-
-unsigned int full_name_hash(const unsigned char *name, unsigned int len)
-{
-	unsigned long hash = init_name_hash();
-	while (len--)
-		hash = partial_name_hash(*name++, hash);
-	return end_name_hash(hash);
-}
-EXPORT_SYMBOL(full_name_hash);
-
-/*
- * We know there's a real path component here of at least
- * one character.
- */
-static inline unsigned long hash_name(const char *name, unsigned int *hashp)
-{
-	unsigned long hash = init_name_hash();
-	unsigned long len = 0, c;
-
-	c = (unsigned char)*name;
-	do {
-		len++;
-		hash = partial_name_hash(c, hash);
-		c = (unsigned char)name[len];
-	} while (c && c != '/');
-	*hashp = end_name_hash(hash);
-	return len;
-}
-
-#endif
-
-/*
- * Name resolution.
- * This is the basic name resolution function, turning a pathname into
- * the final dentry. We expect 'base' to be positive and a directory.
- *
- * Returns 0 and nd will have valid dentry and mnt on success.
- * Returns error and drops reference to input namei data on failure.
- */
-static int link_path_walk(const char *name, struct nameidata *nd)
-{
-	struct path next;
-	int err;
-	
-	while (*name=='/')
-		name++;
-	if (!*name)
-		return 0;
-
-	/* At this point we know we have a real path component. */
-	for(;;) {
-		struct qstr this;
-		long len;
-		int type;
-
-		err = may_lookup(nd);
- 		if (err)
-			break;
-
-		len = hash_name(name, &this.hash);
-		this.name = name;
-		this.len = len;
-
-		type = LAST_NORM;
-		if (name[0] == '.') switch (len) {
-			case 2:
-				if (name[1] == '.') {
-					type = LAST_DOTDOT;
-					nd->flags |= LOOKUP_JUMPED;
-				}
-				break;
-			case 1:
-				type = LAST_DOT;
-		}
-		if (likely(type == LAST_NORM)) {
-			struct dentry *parent = nd->path.dentry;
-			nd->flags &= ~LOOKUP_JUMPED;
-			if (unlikely(parent->d_flags & DCACHE_OP_HASH)) {
-				err = parent->d_op->d_hash(parent, nd->inode,
-							   &this);
-				if (err < 0)
-					break;
-			}
-		}
-
-		if (!name[len])
-			goto last_component;
-		/*
-		 * If it wasn't NUL, we know it was '/'. Skip that
-		 * slash, and continue until no more slashes.
-		 */
-		do {
-			len++;
-		} while (unlikely(name[len] == '/'));
-		if (!name[len])
-			goto last_component;
-		name += len;
-
-		err = walk_component(nd, &next, &this, type, LOOKUP_FOLLOW);
-		if (err < 0)
-			return err;
-
-		if (err) {
-			err = nested_symlink(&next, nd);
-			if (err)
-				return err;
-		}
-		if (can_lookup(nd->inode))
-			continue;
-		err = -ENOTDIR; 
-		break;
-		/* here ends the main loop */
-
-last_component:
-		nd->last = this;
-		nd->last_type = type;
-		return 0;
-	}
-	terminate_walk(nd);
-	return err;
-}
-
-static int path_init(int dfd, const char *name, unsigned int flags,
-		     struct nameidata *nd, struct file **fp)
-{
-	int retval = 0;
-	int fput_needed;
-	struct file *file;
-
-	nd->last_type = LAST_ROOT; /* if there are only slashes... */
-	nd->flags = flags | LOOKUP_JUMPED;
-	nd->depth = 0;
-	if (flags & LOOKUP_ROOT) {
-		struct inode *inode = nd->root.dentry->d_inode;
-		if (*name) {
-			if (!inode->i_op->lookup)
-				return -ENOTDIR;
-			retval = inode_permission(inode, MAY_EXEC);
-			if (retval)
-				return retval;
-		}
-		nd->path = nd->root;
-		nd->inode = inode;
-		if (flags & LOOKUP_RCU) {
-			br_read_lock(vfsmount_lock);
-			rcu_read_lock();
-			nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
-		} else {
-			path_get(&nd->path);
-		}
-		return 0;
-	}
-
-	nd->root.mnt = NULL;
-
-	if (*name=='/') {
-		if (flags & LOOKUP_RCU) {
-			br_read_lock(vfsmount_lock);
-			rcu_read_lock();
-			set_root_rcu(nd);
-		} else {
-			set_root(nd);
-			path_get(&nd->root);
-		}
-		nd->path = nd->root;
-	} else if (dfd == AT_FDCWD) {
-		if (flags & LOOKUP_RCU) {
-			struct fs_struct *fs = current->fs;
-			unsigned seq;
-
-			br_read_lock(vfsmount_lock);
-			rcu_read_lock();
-
-			do {
-				seq = read_seqcount_begin(&fs->seq);
-				nd->path = fs->pwd;
-				nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
-			} while (read_seqcount_retry(&fs->seq, seq));
-		} else {
-			get_fs_pwd(current->fs, &nd->path);
-		}
-	} else {
-		struct dentry *dentry;
-
-		file = fget_raw_light(dfd, &fput_needed);
-		retval = -EBADF;
-		if (!file)
-			goto out_fail;
-
-		dentry = file->f_path.dentry;
-
-		if (*name) {
-			retval = -ENOTDIR;
-			if (!S_ISDIR(dentry->d_inode->i_mode))
-				goto fput_fail;
-
-			retval = inode_permission(dentry->d_inode, MAY_EXEC);
-			if (retval)
-				goto fput_fail;
-		}
-
-		nd->path = file->f_path;
-		if (flags & LOOKUP_RCU) {
-			if (fput_needed)
-				*fp = file;
-			nd->seq = __read_seqcount_begin(&nd->path.dentry->d_seq);
-			br_read_lock(vfsmount_lock);
-			rcu_read_lock();
-		} else {
-			path_get(&file->f_path);
-			fput_light(file, fput_needed);
-		}
-	}
-
-	nd->inode = nd->path.dentry->d_inode;
-	return 0;
-
-fput_fail:
-	fput_light(file, fput_needed);
-out_fail:
-	return retval;
-}
-
-static inline int lookup_last(struct nameidata *nd, struct path *path)
-{
-	if (nd->last_type == LAST_NORM && nd->last.name[nd->last.len])
-		nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
-
-	nd->flags &= ~LOOKUP_PARENT;
-	return walk_component(nd, path, &nd->last, nd->last_type,
-					nd->flags & LOOKUP_FOLLOW);
-}
-
-/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */
-static int path_lookupat(int dfd, const char *name,
-				unsigned int flags, struct nameidata *nd)
-{
-	struct file *base = NULL;
-	struct path path;
-	int err;
-
-	/*
-	 * Path walking is largely split up into 2 different synchronisation
-	 * schemes, rcu-walk and ref-walk (explained in
-	 * Documentation/filesystems/path-lookup.txt). These share much of the
-	 * path walk code, but some things particularly setup, cleanup, and
-	 * following mounts are sufficiently divergent that functions are
-	 * duplicated. Typically there is a function foo(), and its RCU
-	 * analogue, foo_rcu().
-	 *
-	 * -ECHILD is the error number of choice (just to avoid clashes) that
-	 * is returned if some aspect of an rcu-walk fails. Such an error must
-	 * be handled by restarting a traditional ref-walk (which will always
-	 * be able to complete).
-	 */
-	err = path_init(dfd, name, flags | LOOKUP_PARENT, nd, &base);
-
-	if (unlikely(err))
-		return err;
-
-	current->total_link_count = 0;
-	err = link_path_walk(name, nd);
-
-	if (!err && !(flags & LOOKUP_PARENT)) {
-		err = lookup_last(nd, &path);
-		while (err > 0) {
-			void *cookie;
-			struct path link = path;
-			nd->flags |= LOOKUP_PARENT;
-			err = follow_link(&link, nd, &cookie);
-			if (!err)
-				err = lookup_last(nd, &path);
-			put_link(nd, &link, cookie);
-		}
-	}
-
-	if (!err)
-		err = complete_walk(nd);
-
-	if (!err && nd->flags & LOOKUP_DIRECTORY) {
-		if (!nd->inode->i_op->lookup) {
-			path_put(&nd->path);
-			err = -ENOTDIR;
-		}
-	}
-
-	if (base)
-		fput(base);
-
-	if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT)) {
-		path_put(&nd->root);
-		nd->root.mnt = NULL;
-	}
-	return err;
-}
-
-static int do_path_lookup(int dfd, const char *name,
-				unsigned int flags, struct nameidata *nd)
-{
-	int retval = path_lookupat(dfd, name, flags | LOOKUP_RCU, nd);
-	if (unlikely(retval == -ECHILD))
-		retval = path_lookupat(dfd, name, flags, nd);
-	if (unlikely(retval == -ESTALE))
-		retval = path_lookupat(dfd, name, flags | LOOKUP_REVAL, nd);
-
-	if (likely(!retval)) {
-		if (unlikely(!audit_dummy_context())) {
-			if (nd->path.dentry && nd->inode)
-				audit_inode(name, nd->path.dentry);
-		}
-	}
-	return retval;
-}
-
-int kern_path_parent(const char *name, struct nameidata *nd)
-{
-	return do_path_lookup(AT_FDCWD, name, LOOKUP_PARENT, nd);
-}
-
-int kern_path(const char *name, unsigned int flags, struct path *path)
-{
-	struct nameidata nd;
-	int res = do_path_lookup(AT_FDCWD, name, flags, &nd);
-	if (!res)
-		*path = nd.path;
-	return res;
-}
-
-/**
- * vfs_path_lookup - lookup a file path relative to a dentry-vfsmount pair
- * @dentry:  pointer to dentry of the base directory
- * @mnt: pointer to vfs mount of the base directory
- * @name: pointer to file name
- * @flags: lookup flags
- * @path: pointer to struct path to fill
- */
-int vfs_path_lookup(struct dentry *dentry, struct vfsmount *mnt,
-		    const char *name, unsigned int flags,
-		    struct path *path)
-{
-	struct nameidata nd;
-	int err;
-	nd.root.dentry = dentry;
-	nd.root.mnt = mnt;
-	BUG_ON(flags & LOOKUP_PARENT);
-	/* the first argument of do_path_lookup() is ignored with LOOKUP_ROOT */
-	err = do_path_lookup(AT_FDCWD, name, flags | LOOKUP_ROOT, &nd);
-	if (!err)
-		*path = nd.path;
-	return err;
-}
-
-/*
- * Restricted form of lookup. Doesn't follow links, single-component only,
- * needs parent already locked. Doesn't follow mounts.
- * SMP-safe.
- */
-static struct dentry *lookup_hash(struct nameidata *nd)
-{
-	return __lookup_hash(&nd->last, nd->path.dentry, nd);
-}
-
-/**
- * lookup_one_len - filesystem helper to lookup single pathname component
- * @name:	pathname component to lookup
- * @base:	base directory to lookup from
- * @len:	maximum length @len should be interpreted to
- *
- * Note that this routine is purely a helper for filesystem usage and should
- * not be called by generic code.  Also note that by using this function the
- * nameidata argument is passed to the filesystem methods and a filesystem
- * using this helper needs to be prepared for that.
- */
-struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
-{
-	struct qstr this;
-	unsigned int c;
-	int err;
-
-	WARN_ON_ONCE(!mutex_is_locked(&base->d_inode->i_mutex));
-
-	this.name = name;
-	this.len = len;
-	this.hash = full_name_hash(name, len);
-	if (!len)
-		return ERR_PTR(-EACCES);
-
-	while (len--) {
-		c = *(const unsigned char *)name++;
-		if (c == '/' || c == '\0')
-			return ERR_PTR(-EACCES);
-	}
-	/*
-	 * See if the low-level filesystem might want
-	 * to use its own hash..
-	 */
-	if (base->d_flags & DCACHE_OP_HASH) {
-		int err = base->d_op->d_hash(base, base->d_inode, &this);
-		if (err < 0)
-			return ERR_PTR(err);
-	}
-
-	err = inode_permission(base->d_inode, MAY_EXEC);
-	if (err)
-		return ERR_PTR(err);
-
-	return __lookup_hash(&this, base, NULL);
-}
-
-int user_path_at_empty(int dfd, const char __user *name, unsigned flags,
-		 struct path *path, int *empty)
-{
-	struct nameidata nd;
-	char *tmp = getname_flags(name, flags, empty);
-	int err = PTR_ERR(tmp);
-	if (!IS_ERR(tmp)) {
-
-		BUG_ON(flags & LOOKUP_PARENT);
-
-		err = do_path_lookup(dfd, tmp, flags, &nd);
-		putname(tmp);
-		if (!err)
-			*path = nd.path;
-	}
-	return err;
-}
-
-int user_path_at(int dfd, const char __user *name, unsigned flags,
-		 struct path *path)
-{
-	return user_path_at_empty(dfd, name, flags, path, NULL);
-}
-
-static int user_path_parent(int dfd, const char __user *path,
-			struct nameidata *nd, char **name)
-{
-	char *s = getname(path);
-	int error;
-
-	if (IS_ERR(s))
-		return PTR_ERR(s);
-
-	error = do_path_lookup(dfd, s, LOOKUP_PARENT, nd);
-	if (error)
-		putname(s);
-	else
-		*name = s;
-
-	return error;
-}
-
-/*
- * It's inline, so penalty for filesystems that don't use sticky bit is
- * minimal.
- */
-static inline int check_sticky(struct inode *dir, struct inode *inode)
-{
-	uid_t fsuid = current_fsuid();
-
-	if (!(dir->i_mode & S_ISVTX))
-		return 0;
-	if (current_user_ns() != inode_userns(inode))
-		goto other_userns;
-	if (inode->i_uid == fsuid)
-		return 0;
-	if (dir->i_uid == fsuid)
-		return 0;
-
-other_userns:
-	return !ns_capable(inode_userns(inode), CAP_FOWNER);
-}
-
-/*
- *	Check whether we can remove a link victim from directory dir, check
- *  whether the type of victim is right.
- *  1. We can't do it if dir is read-only (done in permission())
- *  2. We should have write and exec permissions on dir
- *  3. We can't remove anything from append-only dir
- *  4. We can't do anything with immutable dir (done in permission())
- *  5. If the sticky bit on dir is set we should either
- *	a. be owner of dir, or
- *	b. be owner of victim, or
- *	c. have CAP_FOWNER capability
- *  6. If the victim is append-only or immutable we can't do antyhing with
- *     links pointing to it.
- *  7. If we were asked to remove a directory and victim isn't one - ENOTDIR.
- *  8. If we were asked to remove a non-directory and victim isn't one - EISDIR.
- *  9. We can't remove a root or mountpoint.
- * 10. We don't allow removal of NFS sillyrenamed files; it's handled by
- *     nfs_async_unlink().
- */
-static int may_delete(struct inode *dir,struct dentry *victim,int isdir)
-{
-	int error;
-
-	if (!victim->d_inode)
-		return -ENOENT;
-
-	BUG_ON(victim->d_parent->d_inode != dir);
-	audit_inode_child(victim, dir);
-
-	error = inode_permission(dir, MAY_WRITE | MAY_EXEC);
-	if (error)
-		return error;
-	if (IS_APPEND(dir))
-		return -EPERM;
-	if (check_sticky(dir, victim->d_inode)||IS_APPEND(victim->d_inode)||
-	    IS_IMMUTABLE(victim->d_inode) || IS_SWAPFILE(victim->d_inode))
-		return -EPERM;
-	if (isdir) {
-		if (!S_ISDIR(victim->d_inode->i_mode))
-			return -ENOTDIR;
-		if (IS_ROOT(victim))
-			return -EBUSY;
-	} else if (S_ISDIR(victim->d_inode->i_mode))
-		return -EISDIR;
-	if (IS_DEADDIR(dir))
-		return -ENOENT;
-	if (victim->d_flags & DCACHE_NFSFS_RENAMED)
-		return -EBUSY;
-	return 0;
-}
-
-/*	Check whether we can create an object with dentry child in directory
- *  dir.
- *  1. We can't do it if child already exists (open has special treatment for
- *     this case, but since we are inlined it's OK)
- *  2. We can't do it if dir is read-only (done in permission())
- *  3. We should have write and exec permissions on dir
- *  4. We can't do it if dir is immutable (done in permission())
- */
-static inline int may_create(struct inode *dir, struct dentry *child)
-{
-	if (child->d_inode)
-		return -EEXIST;
-	if (IS_DEADDIR(dir))
-		return -ENOENT;
-	return inode_permission(dir, MAY_WRITE | MAY_EXEC);
-}
-
-/*
- * p1 and p2 should be directories on the same fs.
- */
-struct dentry *lock_rename(struct dentry *p1, struct dentry *p2)
-{
-	struct dentry *p;
-
-	if (p1 == p2) {
-		mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_PARENT);
-		return NULL;
-	}
-
-	mutex_lock(&p1->d_inode->i_sb->s_vfs_rename_mutex);
-
-	p = d_ancestor(p2, p1);
-	if (p) {
-		mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_PARENT);
-		mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_CHILD);
-		return p;
-	}
-
-	p = d_ancestor(p1, p2);
-	if (p) {
-		mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_PARENT);
-		mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_CHILD);
-		return p;
-	}
-
-	mutex_lock_nested(&p1->d_inode->i_mutex, I_MUTEX_PARENT);
-	mutex_lock_nested(&p2->d_inode->i_mutex, I_MUTEX_CHILD);
-	return NULL;
-}
-
-void unlock_rename(struct dentry *p1, struct dentry *p2)
-{
-	mutex_unlock(&p1->d_inode->i_mutex);
-	if (p1 != p2) {
-		mutex_unlock(&p2->d_inode->i_mutex);
-		mutex_unlock(&p1->d_inode->i_sb->s_vfs_rename_mutex);
-	}
-}
-
-int vfs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
-		struct nameidata *nd)
-{
-	int error = may_create(dir, dentry);
-
-	if (error)
-		return error;
-
-	if (!dir->i_op->create)
-		return -EACCES;	/* shouldn't it be ENOSYS? */
-	mode &= S_IALLUGO;
-	mode |= S_IFREG;
-	error = security_inode_create(dir, dentry, mode);
-	if (error)
-		return error;
-	error = dir->i_op->create(dir, dentry, mode, nd);
-	if (!error)
-		fsnotify_create(dir, dentry);
-	return error;
-}
-
-static int may_open(struct path *path, int acc_mode, int flag)
-{
-	struct dentry *dentry = path->dentry;
-	struct inode *inode = dentry->d_inode;
-	int error;
-
-	/* O_PATH? */
-	if (!acc_mode)
-		return 0;
-
-	if (!inode)
-		return -ENOENT;
-
-	switch (inode->i_mode & S_IFMT) {
-	case S_IFLNK:
-		return -ELOOP;
-	case S_IFDIR:
-		if (acc_mode & MAY_WRITE)
-			return -EISDIR;
-		break;
-	case S_IFBLK:
-	case S_IFCHR:
-		if (path->mnt->mnt_flags & MNT_NODEV)
-			return -EACCES;
-		/*FALLTHRU*/
-	case S_IFIFO:
-	case S_IFSOCK:
-		flag &= ~O_TRUNC;
-		break;
-	}
-
-	error = inode_permission(inode, acc_mode);
-	if (error)
-		return error;
-
-	/*
-	 * An append-only file must be opened in append mode for writing.
-	 */
-	if (IS_APPEND(inode)) {
-		if  ((flag & O_ACCMODE) != O_RDONLY && !(flag & O_APPEND))
-			return -EPERM;
-		if (flag & O_TRUNC)
-			return -EPERM;
-	}
-
-	/* O_NOATIME can only be set by the owner or superuser */
-	if (flag & O_NOATIME && !inode_owner_or_capable(inode))
-		return -EPERM;
-
-	return 0;
-}
-
-static int handle_truncate(struct file *filp)
-{
-	struct path *path = &filp->f_path;
-	struct inode *inode = path->dentry->d_inode;
-	int error = get_write_access(inode);
-	if (error)
-		return error;
-	/*
-	 * Refuse to truncate files with mandatory locks held on them.
-	 */
-	error = locks_verify_locked(inode);
-	if (!error)
-		error = security_path_truncate(path);
-	if (!error) {
-		error = do_truncate(path->dentry, 0,
-				    ATTR_MTIME|ATTR_CTIME|ATTR_OPEN,
-				    filp);
-	}
-	put_write_access(inode);
-	return error;
-}
-
-static inline int open_to_namei_flags(int flag)
-{
-	if ((flag & O_ACCMODE) == 3)
-		flag--;
-	return flag;
-}
-
-/*
- * Handle the last step of open()
- */
-static struct file *do_last(struct nameidata *nd, struct path *path,
-			    const struct open_flags *op, const char *pathname)
-{
-	struct dentry *dir = nd->path.dentry;
-	struct dentry *dentry;
-	int open_flag = op->open_flag;
-	int will_truncate = open_flag & O_TRUNC;
-	int want_write = 0;
-	int acc_mode = op->acc_mode;
-	struct file *filp;
-	int error;
-
-	nd->flags &= ~LOOKUP_PARENT;
-	nd->flags |= op->intent;
-
-	switch (nd->last_type) {
-	case LAST_DOTDOT:
-	case LAST_DOT:
-		error = handle_dots(nd, nd->last_type);
-		if (error)
-			return ERR_PTR(error);
-		/* fallthrough */
-	case LAST_ROOT:
-		error = complete_walk(nd);
-		if (error)
-			return ERR_PTR(error);
-		audit_inode(pathname, nd->path.dentry);
-		if (open_flag & O_CREAT) {
-			error = -EISDIR;
-			goto exit;
-		}
-		goto ok;
-	case LAST_BIND:
-		error = complete_walk(nd);
-		if (error)
-			return ERR_PTR(error);
-		audit_inode(pathname, dir);
-		goto ok;
-	}
-
-	if (!(open_flag & O_CREAT)) {
-		int symlink_ok = 0;
-		if (nd->last.name[nd->last.len])
-			nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
-		if (open_flag & O_PATH && !(nd->flags & LOOKUP_FOLLOW))
-			symlink_ok = 1;
-		/* we _can_ be in RCU mode here */
-		error = walk_component(nd, path, &nd->last, LAST_NORM,
-					!symlink_ok);
-		if (error < 0)
-			return ERR_PTR(error);
-		if (error) /* symlink */
-			return NULL;
-		/* sayonara */
-		error = complete_walk(nd);
-		if (error)
-			return ERR_PTR(error);
-
-		error = -ENOTDIR;
-		if (nd->flags & LOOKUP_DIRECTORY) {
-			if (!nd->inode->i_op->lookup)
-				goto exit;
-		}
-		audit_inode(pathname, nd->path.dentry);
-		goto ok;
-	}
-
-	/* create side of things */
-	/*
-	 * This will *only* deal with leaving RCU mode - LOOKUP_JUMPED has been
-	 * cleared when we got to the last component we are about to look up
-	 */
-	error = complete_walk(nd);
-	if (error)
-		return ERR_PTR(error);
-
-	audit_inode(pathname, dir);
-	error = -EISDIR;
-	/* trailing slashes? */
-	if (nd->last.name[nd->last.len])
-		goto exit;
-
-	mutex_lock(&dir->d_inode->i_mutex);
-
-	dentry = lookup_hash(nd);
-	error = PTR_ERR(dentry);
-	if (IS_ERR(dentry)) {
-		mutex_unlock(&dir->d_inode->i_mutex);
-		goto exit;
-	}
-
-	path->dentry = dentry;
-	path->mnt = nd->path.mnt;
-
-	/* Negative dentry, just create the file */
-	if (!dentry->d_inode) {
-		umode_t mode = op->mode;
-		if (!IS_POSIXACL(dir->d_inode))
-			mode &= ~current_umask();
-		/*
-		 * This write is needed to ensure that a
-		 * rw->ro transition does not occur between
-		 * the time when the file is created and when
-		 * a permanent write count is taken through
-		 * the 'struct file' in nameidata_to_filp().
-		 */
-		error = mnt_want_write(nd->path.mnt);
-		if (error)
-			goto exit_mutex_unlock;
-		want_write = 1;
-		/* Don't check for write permission, don't truncate */
-		open_flag &= ~O_TRUNC;
-		will_truncate = 0;
-		acc_mode = MAY_OPEN;
-		error = security_path_mknod(&nd->path, dentry, mode, 0);
-		if (error)
-			goto exit_mutex_unlock;
-		error = vfs_create(dir->d_inode, dentry, mode, nd);
-		if (error)
-			goto exit_mutex_unlock;
-		mutex_unlock(&dir->d_inode->i_mutex);
-		dput(nd->path.dentry);
-		nd->path.dentry = dentry;
-		goto common;
-	}
-
-	/*
-	 * It already exists.
-	 */
-	mutex_unlock(&dir->d_inode->i_mutex);
-	audit_inode(pathname, path->dentry);
-
-	error = -EEXIST;
-	if (open_flag & O_EXCL)
-		goto exit_dput;
-
-	error = follow_managed(path, nd->flags);
-	if (error < 0)
-		goto exit_dput;
-
-	if (error)
-		nd->flags |= LOOKUP_JUMPED;
-
-	error = -ENOENT;
-	if (!path->dentry->d_inode)
-		goto exit_dput;
-
-	if (path->dentry->d_inode->i_op->follow_link)
-		return NULL;
-
-	path_to_nameidata(path, nd);
-	nd->inode = path->dentry->d_inode;
-	/* Why this, you ask?  _Now_ we might have grown LOOKUP_JUMPED... */
-	error = complete_walk(nd);
-	if (error)
-		return ERR_PTR(error);
-	error = -EISDIR;
-	if (S_ISDIR(nd->inode->i_mode))
-		goto exit;
-ok:
-	if (!S_ISREG(nd->inode->i_mode))
-		will_truncate = 0;
-
-	if (will_truncate) {
-		error = mnt_want_write(nd->path.mnt);
-		if (error)
-			goto exit;
-		want_write = 1;
-	}
-common:
-	error = may_open(&nd->path, acc_mode, open_flag);
-	if (error)
-		goto exit;
-	filp = nameidata_to_filp(nd);
-	if (!IS_ERR(filp)) {
-		error = ima_file_check(filp, op->acc_mode);
-		if (error) {
-			fput(filp);
-			filp = ERR_PTR(error);
-		}
-	}
-	if (!IS_ERR(filp)) {
-		if (will_truncate) {
-			error = handle_truncate(filp);
-			if (error) {
-				fput(filp);
-				filp = ERR_PTR(error);
-			}
-		}
-	}
-out:
-	if (want_write)
-		mnt_drop_write(nd->path.mnt);
-	path_put(&nd->path);
-	return filp;
-
-exit_mutex_unlock:
-	mutex_unlock(&dir->d_inode->i_mutex);
-exit_dput:
-	path_put_conditional(path, nd);
-exit:
-	filp = ERR_PTR(error);
-	goto out;
-}
-
-static struct file *path_openat(int dfd, const char *pathname,
-		struct nameidata *nd, const struct open_flags *op, int flags)
-{
-	struct file *base = NULL;
-	struct file *filp;
-	struct path path;
-	int error;
-
-	filp = get_empty_filp();
-	if (!filp)
-		return ERR_PTR(-ENFILE);
-
-	filp->f_flags = op->open_flag;
-	nd->intent.open.file = filp;
-	nd->intent.open.flags = open_to_namei_flags(op->open_flag);
-	nd->intent.open.create_mode = op->mode;
-
-	error = path_init(dfd, pathname, flags | LOOKUP_PARENT, nd, &base);
-	if (unlikely(error))
-		goto out_filp;
-
-	current->total_link_count = 0;
-	error = link_path_walk(pathname, nd);
-	if (unlikely(error))
-		goto out_filp;
-
-	filp = do_last(nd, &path, op, pathname);
-	while (unlikely(!filp)) { /* trailing symlink */
-		struct path link = path;
-		void *cookie;
-		if (!(nd->flags & LOOKUP_FOLLOW)) {
-			path_put_conditional(&path, nd);
-			path_put(&nd->path);
-			filp = ERR_PTR(-ELOOP);
-			break;
-		}
-		nd->flags |= LOOKUP_PARENT;
-		nd->flags &= ~(LOOKUP_OPEN|LOOKUP_CREATE|LOOKUP_EXCL);
-		error = follow_link(&link, nd, &cookie);
-		if (unlikely(error))
-			filp = ERR_PTR(error);
-		else
-			filp = do_last(nd, &path, op, pathname);
-		put_link(nd, &link, cookie);
-	}
-out:
-	if (nd->root.mnt && !(nd->flags & LOOKUP_ROOT))
-		path_put(&nd->root);
-	if (base)
-		fput(base);
-	release_open_intent(nd);
-	return filp;
-
-out_filp:
-	filp = ERR_PTR(error);
-	goto out;
-}
-
-struct file *do_filp_open(int dfd, const char *pathname,
-		const struct open_flags *op, int flags)
-{
-	struct nameidata nd;
-	struct file *filp;
-
-	filp = path_openat(dfd, pathname, &nd, op, flags | LOOKUP_RCU);
-	if (unlikely(filp == ERR_PTR(-ECHILD)))
-		filp = path_openat(dfd, pathname, &nd, op, flags);
-	if (unlikely(filp == ERR_PTR(-ESTALE)))
-		filp = path_openat(dfd, pathname, &nd, op, flags | LOOKUP_REVAL);
-	return filp;
-}
-
-struct file *do_file_open_root(struct dentry *dentry, struct vfsmount *mnt,
-		const char *name, const struct open_flags *op, int flags)
-{
-	struct nameidata nd;
-	struct file *file;
-
-	nd.root.mnt = mnt;
-	nd.root.dentry = dentry;
-
-	flags |= LOOKUP_ROOT;
-
-	if (dentry->d_inode->i_op->follow_link && op->intent & LOOKUP_OPEN)
-		return ERR_PTR(-ELOOP);
-
-	file = path_openat(-1, name, &nd, op, flags | LOOKUP_RCU);
-	if (unlikely(file == ERR_PTR(-ECHILD)))
-		file = path_openat(-1, name, &nd, op, flags);
-	if (unlikely(file == ERR_PTR(-ESTALE)))
-		file = path_openat(-1, name, &nd, op, flags | LOOKUP_REVAL);
-	return file;
-}
-
-struct dentry *kern_path_create(int dfd, const char *pathname, struct path *path, int is_dir)
-{
-	struct dentry *dentry = ERR_PTR(-EEXIST);
-	struct nameidata nd;
-	int error = do_path_lookup(dfd, pathname, LOOKUP_PARENT, &nd);
-	if (error)
-		return ERR_PTR(error);
-
-	/*
-	 * Yucky last component or no last component at all?
-	 * (foo/., foo/.., /////)
-	 */
-	if (nd.last_type != LAST_NORM)
-		goto out;
-	nd.flags &= ~LOOKUP_PARENT;
-	nd.flags |= LOOKUP_CREATE | LOOKUP_EXCL;
-	nd.intent.open.flags = O_EXCL;
-
-	/*
-	 * Do the final lookup.
-	 */
-	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
-	dentry = lookup_hash(&nd);
-	if (IS_ERR(dentry))
-		goto fail;
-
-	if (dentry->d_inode)
-		goto eexist;
-	/*
-	 * Special case - lookup gave negative, but... we had foo/bar/
-	 * From the vfs_mknod() POV we just have a negative dentry -
-	 * all is fine. Let's be bastards - you had / on the end, you've
-	 * been asking for (non-existent) directory. -ENOENT for you.
-	 */
-	if (unlikely(!is_dir && nd.last.name[nd.last.len])) {
-		dput(dentry);
-		dentry = ERR_PTR(-ENOENT);
-		goto fail;
-	}
-	*path = nd.path;
-	return dentry;
-eexist:
-	dput(dentry);
-	dentry = ERR_PTR(-EEXIST);
-fail:
-	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
-out:
-	path_put(&nd.path);
-	return dentry;
-}
-EXPORT_SYMBOL(kern_path_create);
-
-struct dentry *user_path_create(int dfd, const char __user *pathname, struct path *path, int is_dir)
-{
-	char *tmp = getname(pathname);
-	struct dentry *res;
-	if (IS_ERR(tmp))
-		return ERR_CAST(tmp);
-	res = kern_path_create(dfd, tmp, path, is_dir);
-	putname(tmp);
-	return res;
-}
-EXPORT_SYMBOL(user_path_create);
-
-int vfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t dev)
-{
-	int error = may_create(dir, dentry);
-
-	if (error)
-		return error;
-
-	if ((S_ISCHR(mode) || S_ISBLK(mode)) &&
-	    !ns_capable(inode_userns(dir), CAP_MKNOD))
-		return -EPERM;
-
-	if (!dir->i_op->mknod)
-		return -EPERM;
-
-	error = devcgroup_inode_mknod(mode, dev);
-	if (error)
-		return error;
-
-	error = security_inode_mknod(dir, dentry, mode, dev);
-	if (error)
-		return error;
-
-	error = dir->i_op->mknod(dir, dentry, mode, dev);
-	if (!error)
-		fsnotify_create(dir, dentry);
-	return error;
-}
-
-static int may_mknod(umode_t mode)
-{
-	switch (mode & S_IFMT) {
-	case S_IFREG:
-	case S_IFCHR:
-	case S_IFBLK:
-	case S_IFIFO:
-	case S_IFSOCK:
-	case 0: /* zero mode translates to S_IFREG */
-		return 0;
-	case S_IFDIR:
-		return -EPERM;
-	default:
-		return -EINVAL;
-	}
-}
-
-SYSCALL_DEFINE4(mknodat, int, dfd, const char __user *, filename, umode_t, mode,
-		unsigned, dev)
-{
-	struct dentry *dentry;
-	struct path path;
-	int error;
-
-	if (S_ISDIR(mode))
-		return -EPERM;
-
-	dentry = user_path_create(dfd, filename, &path, 0);
-	if (IS_ERR(dentry))
-		return PTR_ERR(dentry);
-
-	if (!IS_POSIXACL(path.dentry->d_inode))
-		mode &= ~current_umask();
-	error = may_mknod(mode);
-	if (error)
-		goto out_dput;
-	error = mnt_want_write(path.mnt);
-	if (error)
-		goto out_dput;
-	error = security_path_mknod(&path, dentry, mode, dev);
-	if (error)
-		goto out_drop_write;
-	switch (mode & S_IFMT) {
-		case 0: case S_IFREG:
-			error = vfs_create(path.dentry->d_inode,dentry,mode,NULL);
-			break;
-		case S_IFCHR: case S_IFBLK:
-			error = vfs_mknod(path.dentry->d_inode,dentry,mode,
-					new_decode_dev(dev));
-			break;
-		case S_IFIFO: case S_IFSOCK:
-			error = vfs_mknod(path.dentry->d_inode,dentry,mode,0);
-			break;
-	}
-out_drop_write:
-	mnt_drop_write(path.mnt);
-out_dput:
-	dput(dentry);
-	mutex_unlock(&path.dentry->d_inode->i_mutex);
-	path_put(&path);
-
-	return error;
-}
-
-SYSCALL_DEFINE3(mknod, const char __user *, filename, umode_t, mode, unsigned, dev)
-{
-	return sys_mknodat(AT_FDCWD, filename, mode, dev);
-}
-
-int vfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
-{
-	int error = may_create(dir, dentry);
-	unsigned max_links = dir->i_sb->s_max_links;
-
-	if (error)
-		return error;
-
-	if (!dir->i_op->mkdir)
-		return -EPERM;
-
-	mode &= (S_IRWXUGO|S_ISVTX);
-	error = security_inode_mkdir(dir, dentry, mode);
-	if (error)
-		return error;
-
-	if (max_links && dir->i_nlink >= max_links)
-		return -EMLINK;
-
-	error = dir->i_op->mkdir(dir, dentry, mode);
-	if (!error)
-		fsnotify_mkdir(dir, dentry);
-	return error;
-}
-
-SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
-{
-	struct dentry *dentry;
-	struct path path;
-	int error;
-
-	dentry = user_path_create(dfd, pathname, &path, 1);
-	if (IS_ERR(dentry))
-		return PTR_ERR(dentry);
-
-	if (!IS_POSIXACL(path.dentry->d_inode))
-		mode &= ~current_umask();
-	error = mnt_want_write(path.mnt);
-	if (error)
-		goto out_dput;
-	error = security_path_mkdir(&path, dentry, mode);
-	if (error)
-		goto out_drop_write;
-	error = vfs_mkdir(path.dentry->d_inode, dentry, mode);
-out_drop_write:
-	mnt_drop_write(path.mnt);
-out_dput:
-	dput(dentry);
-	mutex_unlock(&path.dentry->d_inode->i_mutex);
-	path_put(&path);
-	return error;
-}
-
-SYSCALL_DEFINE2(mkdir, const char __user *, pathname, umode_t, mode)
-{
-	return sys_mkdirat(AT_FDCWD, pathname, mode);
-}
-
-/*
- * The dentry_unhash() helper will try to drop the dentry early: we
- * should have a usage count of 1 if we're the only user of this
- * dentry, and if that is true (possibly after pruning the dcache),
- * then we drop the dentry now.
- *
- * A low-level filesystem can, if it choses, legally
- * do a
- *
- *	if (!d_unhashed(dentry))
- *		return -EBUSY;
- *
- * if it cannot handle the case of removing a directory
- * that is still in use by something else..
- */
-void dentry_unhash(struct dentry *dentry)
-{
-	shrink_dcache_parent(dentry);
-	spin_lock(&dentry->d_lock);
-	if (dentry->d_count == 1)
-		__d_drop(dentry);
-	spin_unlock(&dentry->d_lock);
-}
-
-int vfs_rmdir(struct inode *dir, struct dentry *dentry)
-{
-	int error = may_delete(dir, dentry, 1);
-
-	if (error)
-		return error;
-
-	if (!dir->i_op->rmdir)
-		return -EPERM;
-
-	dget(dentry);
-	mutex_lock(&dentry->d_inode->i_mutex);
-
-	error = -EBUSY;
-	if (d_mountpoint(dentry))
-		goto out;
-
-	error = security_inode_rmdir(dir, dentry);
-	if (error)
-		goto out;
-
-	shrink_dcache_parent(dentry);
-	error = dir->i_op->rmdir(dir, dentry);
-	if (error)
-		goto out;
-
-	dentry->d_inode->i_flags |= S_DEAD;
-	dont_mount(dentry);
-
-out:
-	mutex_unlock(&dentry->d_inode->i_mutex);
-	dput(dentry);
-	if (!error)
-		d_delete(dentry);
-	return error;
-}
-
-static long do_rmdir(int dfd, const char __user *pathname)
-{
-	int error = 0;
-	char * name;
-	struct dentry *dentry;
-	struct nameidata nd;
-
-	error = user_path_parent(dfd, pathname, &nd, &name);
-	if (error)
-		return error;
-
-	switch(nd.last_type) {
-	case LAST_DOTDOT:
-		error = -ENOTEMPTY;
-		goto exit1;
-	case LAST_DOT:
-		error = -EINVAL;
-		goto exit1;
-	case LAST_ROOT:
-		error = -EBUSY;
-		goto exit1;
-	}
-
-	nd.flags &= ~LOOKUP_PARENT;
-
-	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
-	dentry = lookup_hash(&nd);
-	error = PTR_ERR(dentry);
-	if (IS_ERR(dentry))
-		goto exit2;
-	if (!dentry->d_inode) {
-		error = -ENOENT;
-		goto exit3;
-	}
-	error = mnt_want_write(nd.path.mnt);
-	if (error)
-		goto exit3;
-	error = security_path_rmdir(&nd.path, dentry);
-	if (error)
-		goto exit4;
-	error = vfs_rmdir(nd.path.dentry->d_inode, dentry);
-exit4:
-	mnt_drop_write(nd.path.mnt);
-exit3:
-	dput(dentry);
-exit2:
-	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
-exit1:
-	path_put(&nd.path);
-	putname(name);
-	return error;
-}
-
-SYSCALL_DEFINE1(rmdir, const char __user *, pathname)
-{
-	return do_rmdir(AT_FDCWD, pathname);
-}
-
-int vfs_unlink(struct inode *dir, struct dentry *dentry)
-{
-	int error = may_delete(dir, dentry, 0);
-
-	if (error)
-		return error;
-
-	if (!dir->i_op->unlink)
-		return -EPERM;
-
-	mutex_lock(&dentry->d_inode->i_mutex);
-	if (d_mountpoint(dentry))
-		error = -EBUSY;
-	else {
-		error = security_inode_unlink(dir, dentry);
-		if (!error) {
-			error = dir->i_op->unlink(dir, dentry);
-			if (!error)
-				dont_mount(dentry);
-		}
-	}
-	mutex_unlock(&dentry->d_inode->i_mutex);
-
-	/* We don't d_delete() NFS sillyrenamed files--they still exist. */
-	if (!error && !(dentry->d_flags & DCACHE_NFSFS_RENAMED)) {
-		fsnotify_link_count(dentry->d_inode);
-		d_delete(dentry);
-	}
-
-	return error;
-}
-
-/*
- * Make sure that the actual truncation of the file will occur outside its
- * directory's i_mutex.  Truncate can take a long time if there is a lot of
- * writeout happening, and we don't want to prevent access to the directory
- * while waiting on the I/O.
- */
-static long do_unlinkat(int dfd, const char __user *pathname)
-{
-	int error;
-	char *name;
-	struct dentry *dentry;
-	struct nameidata nd;
-	struct inode *inode = NULL;
-
-	error = user_path_parent(dfd, pathname, &nd, &name);
-	if (error)
-		return error;
-
-	error = -EISDIR;
-	if (nd.last_type != LAST_NORM)
-		goto exit1;
-
-	nd.flags &= ~LOOKUP_PARENT;
-
-	mutex_lock_nested(&nd.path.dentry->d_inode->i_mutex, I_MUTEX_PARENT);
-	dentry = lookup_hash(&nd);
-	error = PTR_ERR(dentry);
-	if (!IS_ERR(dentry)) {
-		/* Why not before? Because we want correct error value */
-		if (nd.last.name[nd.last.len])
-			goto slashes;
-		inode = dentry->d_inode;
-		if (!inode)
-			goto slashes;
-		ihold(inode);
-		error = mnt_want_write(nd.path.mnt);
-		if (error)
-			goto exit2;
-		error = security_path_unlink(&nd.path, dentry);
-		if (error)
-			goto exit3;
-		error = vfs_unlink(nd.path.dentry->d_inode, dentry);
-exit3:
-		mnt_drop_write(nd.path.mnt);
-	exit2:
-		dput(dentry);
-	}
-	mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
-	if (inode)
-		iput(inode);	/* truncate the inode here */
-exit1:
-	path_put(&nd.path);
-	putname(name);
-	return error;
-
-slashes:
-	error = !dentry->d_inode ? -ENOENT :
-		S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR;
-	goto exit2;
-}
-
-SYSCALL_DEFINE3(unlinkat, int, dfd, const char __user *, pathname, int, flag)
-{
-	if ((flag & ~AT_REMOVEDIR) != 0)
-		return -EINVAL;
-
-	if (flag & AT_REMOVEDIR)
-		return do_rmdir(dfd, pathname);
-
-	return do_unlinkat(dfd, pathname);
-}
-
-SYSCALL_DEFINE1(unlink, const char __user *, pathname)
-{
-	return do_unlinkat(AT_FDCWD, pathname);
-}
-
-int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)
-{
-	int error = may_create(dir, dentry);
-
-	if (error)
-		return error;
-
-	if (!dir->i_op->symlink)
-		return -EPERM;
-
-	error = security_inode_symlink(dir, dentry, oldname);
-	if (error)
-		return error;
-
-	error = dir->i_op->symlink(dir, dentry, oldname);
-	if (!error)
-		fsnotify_create(dir, dentry);
-	return error;
-}
-
-SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
-		int, newdfd, const char __user *, newname)
-{
-	int error;
-	char *from;
-	struct dentry *dentry;
-	struct path path;
-
-	from = getname(oldname);
-	if (IS_ERR(from))
-		return PTR_ERR(from);
-
-	dentry = user_path_create(newdfd, newname, &path, 0);
-	error = PTR_ERR(dentry);
-	if (IS_ERR(dentry))
-		goto out_putname;
-
-	error = mnt_want_write(path.mnt);
-	if (error)
-		goto out_dput;
-	error = security_path_symlink(&path, dentry, from);
-	if (error)
-		goto out_drop_write;
-	error = vfs_symlink(path.dentry->d_inode, dentry, from);
-out_drop_write:
-	mnt_drop_write(path.mnt);
-out_dput:
-	dput(dentry);
-	mutex_unlock(&path.dentry->d_inode->i_mutex);
-	path_put(&path);
-out_putname:
-	putname(from);
-	return error;
-}
-
-SYSCALL_DEFINE2(symlink, const char __user *, oldname, const char __user *, newname)
-{
-	return sys_symlinkat(oldname, AT_FDCWD, newname);
-}
-
-int vfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *new_dentry)
-{
-	struct inode *inode = old_dentry->d_inode;
-	unsigned max_links = dir->i_sb->s_max_links;
-	int error;
-
-	if (!inode)
-		return -ENOENT;
-
-	error = may_create(dir, new_dentry);
-	if (error)
-		return error;
-
-	if (dir->i_sb != inode->i_sb)
-		return -EXDEV;
-
-	/*
-	 * A link to an append-only or immutable file cannot be created.
-	 */
-	if (IS_APPEND(inode) || IS_IMMUTABLE(inode))
-		return -EPERM;
-	if (!dir->i_op->link)
-		return -EPERM;
-	if (S_ISDIR(inode->i_mode))
-		return -EPERM;
-
-	error = security_inode_link(old_dentry, dir, new_dentry);
-	if (error)
-		return error;
-
-	mutex_lock(&inode->i_mutex);
-	/* Make sure we don't allow creating hardlink to an unlinked file */
-	if (inode->i_nlink == 0)
-		error =  -ENOENT;
-	else if (max_links && inode->i_nlink >= max_links)
-		error = -EMLINK;
-	else
-		error = dir->i_op->link(old_dentry, dir, new_dentry);
-	mutex_unlock(&inode->i_mutex);
-	if (!error)
-		fsnotify_link(dir, inode, new_dentry);
-	return error;
-}
-
-/*
- * Hardlinks are often used in delicate situations.  We avoid
- * security-related surprises by not following symlinks on the
- * newname.  --KAB
- *
- * We don't follow them on the oldname either to be compatible
- * with linux 2.0, and to avoid hard-linking to directories
- * and other special files.  --ADM
- */
-SYSCALL_DEFINE5(linkat, int, olddfd, const char __user *, oldname,
-		int, newdfd, const char __user *, newname, int, flags)
-{
-	struct dentry *new_dentry;
-	struct path old_path, new_path;
-	int how = 0;
-	int error;
-
-	if ((flags & ~(AT_SYMLINK_FOLLOW | AT_EMPTY_PATH)) != 0)
-		return -EINVAL;
-	/*
-	 * To use null names we require CAP_DAC_READ_SEARCH
-	 * This ensures that not everyone will be able to create
-	 * handlink using the passed filedescriptor.
-	 */
-	if (flags & AT_EMPTY_PATH) {
-		if (!capable(CAP_DAC_READ_SEARCH))
-			return -ENOENT;
-		how = LOOKUP_EMPTY;
-	}
-
-	if (flags & AT_SYMLINK_FOLLOW)
-		how |= LOOKUP_FOLLOW;
-
-	error = user_path_at(olddfd, oldname, how, &old_path);
-	if (error)
-		return error;
-
-	new_dentry = user_path_create(newdfd, newname, &new_path, 0);
-	error = PTR_ERR(new_dentry);
-	if (IS_ERR(new_dentry))
-		goto out;
-
-	error = -EXDEV;
-	if (old_path.mnt != new_path.mnt)
-		goto out_dput;
-	error = mnt_want_write(new_path.mnt);
-	if (error)
-		goto out_dput;
-	error = security_path_link(old_path.dentry, &new_path, new_dentry);
-	if (error)
-		goto out_drop_write;
-	error = vfs_link(old_path.dentry, new_path.dentry->d_inode, new_dentry);
-out_drop_write:
-	mnt_drop_write(new_path.mnt);
-out_dput:
-	dput(new_dentry);
-	mutex_unlock(&new_path.dentry->d_inode->i_mutex);
-	path_put(&new_path);
-out:
-	path_put(&old_path);
-
-	return error;
-}
-
-SYSCALL_DEFINE2(link, const char __user *, oldname, const char __user *, newname)
-{
-	return sys_linkat(AT_FDCWD, oldname, AT_FDCWD, newname, 0);
-}
-
-/*
- * The worst of all namespace operations - renaming directory. "Perverted"
- * doesn't even start to describe it. Somebody in UCB had a heck of a trip...
- * Problems:
- *	a) we can get into loop creation. Check is done in is_subdir().
- *	b) race potential - two innocent renames can create a loop together.
- *	   That's where 4.4 screws up. Current fix: serialization on
- *	   sb->s_vfs_rename_mutex. We might be more accurate, but that's another
- *	   story.
- *	c) we have to lock _three_ objects - parents and victim (if it exists).
- *	   And that - after we got ->i_mutex on parents (until then we don't know
- *	   whether the target exists).  Solution: try to be smart with locking
- *	   order for inodes.  We rely on the fact that tree topology may change
- *	   only under ->s_vfs_rename_mutex _and_ that parent of the object we
- *	   move will be locked.  Thus we can rank directories by the tree
- *	   (ancestors first) and rank all non-directories after them.
- *	   That works since everybody except rename does "lock parent, lookup,
- *	   lock child" and rename is under ->s_vfs_rename_mutex.
- *	   HOWEVER, it relies on the assumption that any object with ->lookup()
- *	   has no more than 1 dentry.  If "hybrid" objects will ever appear,
- *	   we'd better make sure that there's no link(2) for them.
- *	d) conversion from fhandle to dentry may come in the wrong moment - when
- *	   we are removing the target. Solution: we will have to grab ->i_mutex
- *	   in the fhandle_to_dentry code. [FIXME - current nfsfh.c relies on
- *	   ->i_mutex on parents, which works but leads to some truly excessive
- *	   locking].
- */
-static int vfs_rename_dir(struct inode *old_dir, struct dentry *old_dentry,
-			  struct inode *new_dir, struct dentry *new_dentry)
-{
-	int error = 0;
-	struct inode *target = new_dentry->d_inode;
-	unsigned max_links = new_dir->i_sb->s_max_links;
-
-	/*
-	 * If we are going to change the parent - check write permissions,
-	 * we'll need to flip '..'.
-	 */
-	if (new_dir != old_dir) {
-		error = inode_permission(old_dentry->d_inode, MAY_WRITE);
-		if (error)
-			return error;
-	}
-
-	error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry);
-	if (error)
-		return error;
-
-	dget(new_dentry);
-	if (target)
-		mutex_lock(&target->i_mutex);
-
-	error = -EBUSY;
-	if (d_mountpoint(old_dentry) || d_mountpoint(new_dentry))
-		goto out;
-
-	error = -EMLINK;
-	if (max_links && !target && new_dir != old_dir &&
-	    new_dir->i_nlink >= max_links)
-		goto out;
-
-	if (target)
-		shrink_dcache_parent(new_dentry);
-	error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry);
-	if (error)
-		goto out;
-
-	if (target) {
-		target->i_flags |= S_DEAD;
-		dont_mount(new_dentry);
-	}
-out:
-	if (target)
-		mutex_unlock(&target->i_mutex);
-	dput(new_dentry);
-	if (!error)
-		if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE))
-			d_move(old_dentry,new_dentry);
-	return error;
-}
-
-static int vfs_rename_other(struct inode *old_dir, struct dentry *old_dentry,
-			    struct inode *new_dir, struct dentry *new_dentry)
-{
-	struct inode *target = new_dentry->d_inode;
-	int error;
-
-	error = security_inode_rename(old_dir, old_dentry, new_dir, new_dentry);
-	if (error)
-		return error;
-
-	dget(new_dentry);
-	if (target)
-		mutex_lock(&target->i_mutex);
-
-	error = -EBUSY;
-	if (d_mountpoint(old_dentry)||d_mountpoint(new_dentry))
-		goto out;
-
-	error = old_dir->i_op->rename(old_dir, old_dentry, new_dir, new_dentry);
-	if (error)
-		goto out;
-
-	if (target)
-		dont_mount(new_dentry);
-	if (!(old_dir->i_sb->s_type->fs_flags & FS_RENAME_DOES_D_MOVE))
-		d_move(old_dentry, new_dentry);
-out:
-	if (target)
-		mutex_unlock(&target->i_mutex);
-	dput(new_dentry);
-	return error;
-}
-
-int vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
-	       struct inode *new_dir, struct dentry *new_dentry)
-{
-	int error;
-	int is_dir = S_ISDIR(old_dentry->d_inode->i_mode);
-	const unsigned char *old_name;
-
-	if (old_dentry->d_inode == new_dentry->d_inode)
- 		return 0;
- 
-	error = may_delete(old_dir, old_dentry, is_dir);
-	if (error)
-		return error;
-
-	if (!new_dentry->d_inode)
-		error = may_create(new_dir, new_dentry);
-	else
-		error = may_delete(new_dir, new_dentry, is_dir);
-	if (error)
-		return error;
-
-	if (!old_dir->i_op->rename)
-		return -EPERM;
-
-	old_name = fsnotify_oldname_init(old_dentry->d_name.name);
-
-	if (is_dir)
-		error = vfs_rename_dir(old_dir,old_dentry,new_dir,new_dentry);
-	else
-		error = vfs_rename_other(old_dir,old_dentry,new_dir,new_dentry);
-	if (!error)
-		fsnotify_move(old_dir, new_dir, old_name, is_dir,
-			      new_dentry->d_inode, old_dentry);
-	fsnotify_oldname_free(old_name);
-
-	return error;
-}
-
-SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,
-		int, newdfd, const char __user *, newname)
-{
-	struct dentry *old_dir, *new_dir;
-	struct dentry *old_dentry, *new_dentry;
-	struct dentry *trap;
-	struct nameidata oldnd, newnd;
-	char *from;
-	char *to;
-	int error;
-
-	error = user_path_parent(olddfd, oldname, &oldnd, &from);
-	if (error)
-		goto exit;
-
-	error = user_path_parent(newdfd, newname, &newnd, &to);
-	if (error)
-		goto exit1;
-
-	error = -EXDEV;
-	if (oldnd.path.mnt != newnd.path.mnt)
-		goto exit2;
-
-	old_dir = oldnd.path.dentry;
-	error = -EBUSY;
-	if (oldnd.last_type != LAST_NORM)
-		goto exit2;
-
-	new_dir = newnd.path.dentry;
-	if (newnd.last_type != LAST_NORM)
-		goto exit2;
-
-	oldnd.flags &= ~LOOKUP_PARENT;
-	newnd.flags &= ~LOOKUP_PARENT;
-	newnd.flags |= LOOKUP_RENAME_TARGET;
-
-	trap = lock_rename(new_dir, old_dir);
-
-	old_dentry = lookup_hash(&oldnd);
-	error = PTR_ERR(old_dentry);
-	if (IS_ERR(old_dentry))
-		goto exit3;
-	/* source must exist */
-	error = -ENOENT;
-	if (!old_dentry->d_inode)
-		goto exit4;
-	/* unless the source is a directory trailing slashes give -ENOTDIR */
-	if (!S_ISDIR(old_dentry->d_inode->i_mode)) {
-		error = -ENOTDIR;
-		if (oldnd.last.name[oldnd.last.len])
-			goto exit4;
-		if (newnd.last.name[newnd.last.len])
-			goto exit4;
-	}
-	/* source should not be ancestor of target */
-	error = -EINVAL;
-	if (old_dentry == trap)
-		goto exit4;
-	new_dentry = lookup_hash(&newnd);
-	error = PTR_ERR(new_dentry);
-	if (IS_ERR(new_dentry))
-		goto exit4;
-	/* target should not be an ancestor of source */
-	error = -ENOTEMPTY;
-	if (new_dentry == trap)
-		goto exit5;
-
-	error = mnt_want_write(oldnd.path.mnt);
-	if (error)
-		goto exit5;
-	error = security_path_rename(&oldnd.path, old_dentry,
-				     &newnd.path, new_dentry);
-	if (error)
-		goto exit6;
-	error = vfs_rename(old_dir->d_inode, old_dentry,
-				   new_dir->d_inode, new_dentry);
-exit6:
-	mnt_drop_write(oldnd.path.mnt);
-exit5:
-	dput(new_dentry);
-exit4:
-	dput(old_dentry);
-exit3:
-	unlock_rename(new_dir, old_dir);
-exit2:
-	path_put(&newnd.path);
-	putname(to);
-exit1:
-	path_put(&oldnd.path);
-	putname(from);
-exit:
-	return error;
-}
-
-SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newname)
-{
-	return sys_renameat(AT_FDCWD, oldname, AT_FDCWD, newname);
-}
-
-int vfs_readlink(struct dentry *dentry, char __user *buffer, int buflen, const char *link)
-{
-	int len;
-
-	len = PTR_ERR(link);
-	if (IS_ERR(link))
-		goto out;
-
-	len = strlen(link);
-	if (len > (unsigned) buflen)
-		len = buflen;
-	if (copy_to_user(buffer, link, len))
-		len = -EFAULT;
-out:
-	return len;
-}
-
-/*
- * A helper for ->readlink().  This should be used *ONLY* for symlinks that
- * have ->follow_link() touching nd only in nd_set_link().  Using (or not
- * using) it for any given inode is up to filesystem.
- */
-int generic_readlink(struct dentry *dentry, char __user *buffer, int buflen)
-{
-	struct nameidata nd;
-	void *cookie;
-	int res;
-
-	nd.depth = 0;
-	cookie = dentry->d_inode->i_op->follow_link(dentry, &nd);
-	if (IS_ERR(cookie))
-		return PTR_ERR(cookie);
-
-	res = vfs_readlink(dentry, buffer, buflen, nd_get_link(&nd));
-	if (dentry->d_inode->i_op->put_link)
-		dentry->d_inode->i_op->put_link(dentry, &nd, cookie);
-	return res;
-}
-
-int vfs_follow_link(struct nameidata *nd, const char *link)
-{
-	return __vfs_follow_link(nd, link);
-}
-
-/* get the link contents into pagecache */
-static char *page_getlink(struct dentry * dentry, struct page **ppage)
-{
-	char *kaddr;
-	struct page *page;
-	struct address_space *mapping = dentry->d_inode->i_mapping;
-	page = read_mapping_page(mapping, 0, NULL);
-	if (IS_ERR(page))
-		return (char*)page;
-	*ppage = page;
-	kaddr = kmap(page);
-	nd_terminate_link(kaddr, dentry->d_inode->i_size, PAGE_SIZE - 1);
-	return kaddr;
-}
-
-int page_readlink(struct dentry *dentry, char __user *buffer, int buflen)
-{
-	struct page *page = NULL;
-	char *s = page_getlink(dentry, &page);
-	int res = vfs_readlink(dentry,buffer,buflen,s);
-	if (page) {
-		kunmap(page);
-		page_cache_release(page);
-	}
-	return res;
-}
-
-void *page_follow_link_light(struct dentry *dentry, struct nameidata *nd)
-{
-	struct page *page = NULL;
-	nd_set_link(nd, page_getlink(dentry, &page));
-	return page;
-}
-
-void page_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
-{
-	struct page *page = cookie;
-
-	if (page) {
-		kunmap(page);
-		page_cache_release(page);
-	}
-}
-
-/*
- * The nofs argument instructs pagecache_write_begin to pass AOP_FLAG_NOFS
- */
-int __page_symlink(struct inode *inode, const char *symname, int len, int nofs)
-{
-	struct address_space *mapping = inode->i_mapping;
-	struct page *page;
-	void *fsdata;
-	int err;
-	char *kaddr;
-	unsigned int flags = AOP_FLAG_UNINTERRUPTIBLE;
-	if (nofs)
-		flags |= AOP_FLAG_NOFS;
-
-retry:
-	err = pagecache_write_begin(NULL, mapping, 0, len-1,
-				flags, &page, &fsdata);
-	if (err)
-		goto fail;
-
-	kaddr = kmap_atomic(page);
-	memcpy(kaddr, symname, len-1);
-	kunmap_atomic(kaddr);
-
-	err = pagecache_write_end(NULL, mapping, 0, len-1, len-1,
-							page, fsdata);
-	if (err < 0)
-		goto fail;
-	if (err < len-1)
-		goto retry;
-
-	mark_inode_dirty(inode);
-	return 0;
-fail:
-	return err;
-}
-
-int page_symlink(struct inode *inode, const char *symname, int len)
-{
-	return __page_symlink(inode, symname, len,
-			!(mapping_gfp_mask(inode->i_mapping) & __GFP_FS));
-}
-
-const struct inode_operations page_symlink_inode_operations = {
-	.readlink	= generic_readlink,
-	.follow_link	= page_follow_link_light,
-	.put_link	= page_put_link,
-};
-
-EXPORT_SYMBOL(user_path_at);
-EXPORT_SYMBOL(follow_down_one);
-EXPORT_SYMBOL(follow_down);
-EXPORT_SYMBOL(follow_up);
-EXPORT_SYMBOL(get_write_access); /* binfmt_aout */
-EXPORT_SYMBOL(getname);
-EXPORT_SYMBOL(lock_rename);
-EXPORT_SYMBOL(lookup_one_len);
-EXPORT_SYMBOL(page_follow_link_light);
-EXPORT_SYMBOL(page_put_link);
-EXPORT_SYMBOL(page_readlink);
-EXPORT_SYMBOL(__page_symlink);
-EXPORT_SYMBOL(page_symlink);
-EXPORT_SYMBOL(page_symlink_inode_operations);
-EXPORT_SYMBOL(kern_path);
-EXPORT_SYMBOL(vfs_path_lookup);
-EXPORT_SYMBOL(inode_permission);
-EXPORT_SYMBOL(unlock_rename);
-EXPORT_SYMBOL(vfs_create);
-EXPORT_SYMBOL(vfs_follow_link);
-EXPORT_SYMBOL(vfs_link);
-EXPORT_SYMBOL(vfs_mkdir);
-EXPORT_SYMBOL(vfs_mknod);
-EXPORT_SYMBOL(generic_permission);
-EXPORT_SYMBOL(vfs_readlink);
-EXPORT_SYMBOL(vfs_rename);
-EXPORT_SYMBOL(vfs_rmdir);
-EXPORT_SYMBOL(vfs_symlink);
-EXPORT_SYMBOL(vfs_unlink);
-EXPORT_SYMBOL(dentry_unhash);
-EXPORT_SYMBOL(generic_readlink);