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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/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * fs/kernfs/kernfs-internal.h - kernfs internal header file
4 *
5 * Copyright (c) 2001-3 Patrick Mochel
6 * Copyright (c) 2007 SUSE Linux Products GmbH
7 * Copyright (c) 2007, 2013 Tejun Heo <teheo@suse.de>
8 */
9
10#ifndef __KERNFS_INTERNAL_H
11#define __KERNFS_INTERNAL_H
12
13#include <linux/lockdep.h>
14#include <linux/fs.h>
15#include <linux/mutex.h>
16#include <linux/xattr.h>
17
18#include <linux/kernfs.h>
19#include <linux/fs_context.h>
20
21struct kernfs_iattrs {
22 kuid_t ia_uid;
23 kgid_t ia_gid;
24 struct timespec64 ia_atime;
25 struct timespec64 ia_mtime;
26 struct timespec64 ia_ctime;
27
28 struct simple_xattrs xattrs;
29};
30
31/* +1 to avoid triggering overflow warning when negating it */
32#define KN_DEACTIVATED_BIAS (INT_MIN + 1)
33
34/* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
35
36/**
37 * kernfs_root - find out the kernfs_root a kernfs_node belongs to
38 * @kn: kernfs_node of interest
39 *
40 * Return the kernfs_root @kn belongs to.
41 */
42static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
43{
44 /* if parent exists, it's always a dir; otherwise, @sd is a dir */
45 if (kn->parent)
46 kn = kn->parent;
47 return kn->dir.root;
48}
49
50/*
51 * mount.c
52 */
53struct kernfs_super_info {
54 struct super_block *sb;
55
56 /*
57 * The root associated with this super_block. Each super_block is
58 * identified by the root and ns it's associated with.
59 */
60 struct kernfs_root *root;
61
62 /*
63 * Each sb is associated with one namespace tag, currently the
64 * network namespace of the task which mounted this kernfs
65 * instance. If multiple tags become necessary, make the following
66 * an array and compare kernfs_node tag against every entry.
67 */
68 const void *ns;
69
70 /* anchored at kernfs_root->supers, protected by kernfs_mutex */
71 struct list_head node;
72};
73#define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
74
75static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry)
76{
77 if (d_really_is_negative(dentry))
78 return NULL;
79 return d_inode(dentry)->i_private;
80}
81
82extern const struct super_operations kernfs_sops;
83extern struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache;
84
85/*
86 * inode.c
87 */
88extern const struct xattr_handler *kernfs_xattr_handlers[];
89void kernfs_evict_inode(struct inode *inode);
90int kernfs_iop_permission(struct inode *inode, int mask);
91int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
92int kernfs_iop_getattr(const struct path *path, struct kstat *stat,
93 u32 request_mask, unsigned int query_flags);
94ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
95int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr);
96
97/*
98 * dir.c
99 */
100extern struct mutex kernfs_mutex;
101extern const struct dentry_operations kernfs_dops;
102extern const struct file_operations kernfs_dir_fops;
103extern const struct inode_operations kernfs_dir_iops;
104
105struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
106void kernfs_put_active(struct kernfs_node *kn);
107int kernfs_add_one(struct kernfs_node *kn);
108struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
109 const char *name, umode_t mode,
110 kuid_t uid, kgid_t gid,
111 unsigned flags);
112struct kernfs_node *kernfs_find_and_get_node_by_ino(struct kernfs_root *root,
113 unsigned int ino);
114
115/*
116 * file.c
117 */
118extern const struct file_operations kernfs_file_fops;
119
120void kernfs_drain_open_files(struct kernfs_node *kn);
121
122/*
123 * symlink.c
124 */
125extern const struct inode_operations kernfs_symlink_iops;
126
127#endif /* __KERNFS_INTERNAL_H */