2 * fs/kernfs/kernfs-internal.h - kernfs internal header file
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>
8 * This file is released under the GPLv2.
11 #ifndef __KERNFS_INTERNAL_H
12 #define __KERNFS_INTERNAL_H
14 #include <linux/lockdep.h>
16 #include <linux/mutex.h>
17 #include <linux/xattr.h>
19 #include <linux/kernfs.h>
20 #include <linux/fs_context.h>
22 struct kernfs_iattrs {
25 struct timespec64 ia_atime;
26 struct timespec64 ia_mtime;
27 struct timespec64 ia_ctime;
29 struct simple_xattrs xattrs;
32 /* +1 to avoid triggering overflow warning when negating it */
33 #define KN_DEACTIVATED_BIAS (INT_MIN + 1)
35 /* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
38 * kernfs_root - find out the kernfs_root a kernfs_node belongs to
39 * @kn: kernfs_node of interest
41 * Return the kernfs_root @kn belongs to.
43 static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
45 /* if parent exists, it's always a dir; otherwise, @sd is a dir */
54 struct kernfs_super_info {
55 struct super_block *sb;
58 * The root associated with this super_block. Each super_block is
59 * identified by the root and ns it's associated with.
61 struct kernfs_root *root;
64 * Each sb is associated with one namespace tag, currently the
65 * network namespace of the task which mounted this kernfs
66 * instance. If multiple tags become necessary, make the following
67 * an array and compare kernfs_node tag against every entry.
71 /* anchored at kernfs_root->supers, protected by kernfs_mutex */
72 struct list_head node;
74 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
76 static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry)
78 if (d_really_is_negative(dentry))
80 return d_inode(dentry)->i_private;
83 extern const struct super_operations kernfs_sops;
84 extern struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache;
89 extern const struct xattr_handler *kernfs_xattr_handlers[];
90 void kernfs_evict_inode(struct inode *inode);
91 int kernfs_iop_permission(struct inode *inode, int mask);
92 int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
93 int kernfs_iop_getattr(const struct path *path, struct kstat *stat,
94 u32 request_mask, unsigned int query_flags);
95 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
96 int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr);
101 extern struct mutex kernfs_mutex;
102 extern const struct dentry_operations kernfs_dops;
103 extern const struct file_operations kernfs_dir_fops;
104 extern const struct inode_operations kernfs_dir_iops;
106 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
107 void kernfs_put_active(struct kernfs_node *kn);
108 int kernfs_add_one(struct kernfs_node *kn);
109 struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
110 const char *name, umode_t mode,
111 kuid_t uid, kgid_t gid,
113 struct kernfs_node *kernfs_find_and_get_node_by_ino(struct kernfs_root *root,
119 extern const struct file_operations kernfs_file_fops;
121 void kernfs_drain_open_files(struct kernfs_node *kn);
126 extern const struct inode_operations kernfs_symlink_iops;
128 #endif /* __KERNFS_INTERNAL_H */