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 */
79struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn);
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);
85int kernfs_iop_setxattr(struct dentry *dentry, const char *name, const void *value,
86			size_t size, int flags);
87int kernfs_iop_removexattr(struct dentry *dentry, const char *name);
88ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf,
89			    size_t size);
90ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
91
92/*
93 * dir.c
94 */
95extern struct mutex kernfs_mutex;
96extern const struct dentry_operations kernfs_dops;
97extern const struct file_operations kernfs_dir_fops;
98extern const struct inode_operations kernfs_dir_iops;
99
100struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
101void kernfs_put_active(struct kernfs_node *kn);
102int kernfs_add_one(struct kernfs_node *kn);
103struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
104				    const char *name, umode_t mode,
105				    unsigned flags);
106
107/*
108 * file.c
109 */
110extern const struct file_operations kernfs_file_fops;
111
112void kernfs_unmap_bin_file(struct kernfs_node *kn);
113
114/*
115 * symlink.c
116 */
117extern const struct inode_operations kernfs_symlink_iops;
118
119#endif	/* __KERNFS_INTERNAL_H */
120