Loading...
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
73static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry)
74{
75 if (d_really_is_negative(dentry))
76 return NULL;
77 return d_inode(dentry)->i_private;
78}
79
80extern const struct super_operations kernfs_sops;
81extern struct kmem_cache *kernfs_node_cache;
82
83/*
84 * inode.c
85 */
86extern const struct xattr_handler *kernfs_xattr_handlers[];
87void kernfs_evict_inode(struct inode *inode);
88int kernfs_iop_permission(struct inode *inode, int mask);
89int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
90int kernfs_iop_getattr(const struct path *path, struct kstat *stat,
91 u32 request_mask, unsigned int query_flags);
92ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
93
94/*
95 * dir.c
96 */
97extern struct mutex kernfs_mutex;
98extern const struct dentry_operations kernfs_dops;
99extern const struct file_operations kernfs_dir_fops;
100extern const struct inode_operations kernfs_dir_iops;
101
102struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
103void kernfs_put_active(struct kernfs_node *kn);
104int kernfs_add_one(struct kernfs_node *kn);
105struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
106 const char *name, umode_t mode,
107 unsigned flags);
108struct kernfs_node *kernfs_find_and_get_node_by_ino(struct kernfs_root *root,
109 unsigned int ino);
110
111/*
112 * file.c
113 */
114extern const struct file_operations kernfs_file_fops;
115
116void kernfs_drain_open_files(struct kernfs_node *kn);
117
118/*
119 * symlink.c
120 */
121extern const struct inode_operations kernfs_symlink_iops;
122
123#endif /* __KERNFS_INTERNAL_H */
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 */
79void kernfs_evict_inode(struct inode *inode);
80int kernfs_iop_permission(struct inode *inode, int mask);
81int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
82int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry,
83 struct kstat *stat);
84int kernfs_iop_setxattr(struct dentry *dentry, const char *name, const void *value,
85 size_t size, int flags);
86int kernfs_iop_removexattr(struct dentry *dentry, const char *name);
87ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf,
88 size_t size);
89ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
90
91/*
92 * dir.c
93 */
94extern struct mutex kernfs_mutex;
95extern const struct dentry_operations kernfs_dops;
96extern const struct file_operations kernfs_dir_fops;
97extern const struct inode_operations kernfs_dir_iops;
98
99struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
100void kernfs_put_active(struct kernfs_node *kn);
101int kernfs_add_one(struct kernfs_node *kn);
102struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
103 const char *name, umode_t mode,
104 unsigned flags);
105
106/*
107 * file.c
108 */
109extern const struct file_operations kernfs_file_fops;
110
111void kernfs_unmap_bin_file(struct kernfs_node *kn);
112
113/*
114 * symlink.c
115 */
116extern const struct inode_operations kernfs_symlink_iops;
117
118#endif /* __KERNFS_INTERNAL_H */