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
21 struct 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 */
kernfs_root(struct kernfs_node * kn)40 static 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 */
51 struct 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
kernfs_dentry_node(struct dentry * dentry)73 static 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
80 extern const struct super_operations kernfs_sops;
81 extern struct kmem_cache *kernfs_node_cache;
82
83 /*
84 * inode.c
85 */
86 extern const struct xattr_handler *kernfs_xattr_handlers[];
87 void kernfs_evict_inode(struct inode *inode);
88 int kernfs_iop_permission(struct inode *inode, int mask);
89 int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
90 int kernfs_iop_getattr(const struct path *path, struct kstat *stat,
91 u32 request_mask, unsigned int query_flags);
92 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
93 int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr);
94
95 /*
96 * dir.c
97 */
98 extern struct mutex kernfs_mutex;
99 extern const struct dentry_operations kernfs_dops;
100 extern const struct file_operations kernfs_dir_fops;
101 extern const struct inode_operations kernfs_dir_iops;
102
103 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
104 void kernfs_put_active(struct kernfs_node *kn);
105 int kernfs_add_one(struct kernfs_node *kn);
106 struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
107 const char *name, umode_t mode,
108 kuid_t uid, kgid_t gid,
109 unsigned flags);
110 struct kernfs_node *kernfs_find_and_get_node_by_ino(struct kernfs_root *root,
111 unsigned int ino);
112
113 /*
114 * file.c
115 */
116 extern const struct file_operations kernfs_file_fops;
117
118 void kernfs_drain_open_files(struct kernfs_node *kn);
119
120 /*
121 * symlink.c
122 */
123 extern const struct inode_operations kernfs_symlink_iops;
124
125 #endif /* __KERNFS_INTERNAL_H */
126