1/*
  2 * fs/kernfs/kernfs-internal.h - kernfs internal header file
  3 *
  4 * Copyright (c) 2001-3 Patrick Mochel
  5 * Copyright (c) 2007 SUSE Linux Products GmbH
  6 * Copyright (c) 2007, 2013 Tejun Heo <teheo@suse.de>
  7 *
  8 * This file is released under the GPLv2.
  9 */
 10
 11#ifndef __KERNFS_INTERNAL_H
 12#define __KERNFS_INTERNAL_H
 13
 14#include <linux/lockdep.h>
 15#include <linux/fs.h>
 16#include <linux/mutex.h>
 17#include <linux/xattr.h>
 18
 19#include <linux/kernfs.h>
 20
 21struct kernfs_iattrs {
 22	struct iattr		ia_iattr;
 23	void			*ia_secdata;
 24	u32			ia_secdata_len;
 25
 26	struct simple_xattrs	xattrs;
 27};
 28
 29/* +1 to avoid triggering overflow warning when negating it */
 30#define KN_DEACTIVATED_BIAS		(INT_MIN + 1)
 31
 32/* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
 33
 34/**
 35 * kernfs_root - find out the kernfs_root a kernfs_node belongs to
 36 * @kn: kernfs_node of interest
 37 *
 38 * Return the kernfs_root @kn belongs to.
 39 */
 40static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
 41{
 42	/* if parent exists, it's always a dir; otherwise, @sd is a dir */
 43	if (kn->parent)
 44		kn = kn->parent;
 45	return kn->dir.root;
 46}
 47
 48/*
 49 * mount.c
 50 */
 51struct kernfs_super_info {
 52	struct super_block	*sb;
 53
 54	/*
 55	 * The root associated with this super_block.  Each super_block is
 56	 * identified by the root and ns it's associated with.
 57	 */
 58	struct kernfs_root	*root;
 59
 60	/*
 61	 * Each sb is associated with one namespace tag, currently the
 62	 * network namespace of the task which mounted this kernfs
 63	 * instance.  If multiple tags become necessary, make the following
 64	 * an array and compare kernfs_node tag against every entry.
 65	 */
 66	const void		*ns;
 67
 68	/* anchored at kernfs_root->supers, protected by kernfs_mutex */
 69	struct list_head	node;
 70};
 71#define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
 72
 73extern const struct super_operations kernfs_sops;
 74extern struct kmem_cache *kernfs_node_cache;
 75
 76/*
 77 * inode.c
 78 */
 79extern const struct xattr_handler *kernfs_xattr_handlers[];
 80void kernfs_evict_inode(struct inode *inode);
 81int kernfs_iop_permission(struct inode *inode, int mask);
 82int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
 83int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry,
 84		       struct kstat *stat);
 85ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
 86
 87/*
 88 * dir.c
 89 */
 90extern struct mutex kernfs_mutex;
 91extern const struct dentry_operations kernfs_dops;
 92extern const struct file_operations kernfs_dir_fops;
 93extern const struct inode_operations kernfs_dir_iops;
 94
 95struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
 96void kernfs_put_active(struct kernfs_node *kn);
 97int kernfs_add_one(struct kernfs_node *kn);
 98struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
 99				    const char *name, umode_t mode,
100				    unsigned flags);
101
102/*
103 * file.c
104 */
105extern const struct file_operations kernfs_file_fops;
106
107void kernfs_unmap_bin_file(struct kernfs_node *kn);
108
109/*
110 * symlink.c
111 */
112extern const struct inode_operations kernfs_symlink_iops;
113
114#endif	/* __KERNFS_INTERNAL_H */