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>
21 struct kernfs_iattrs {
22 struct iattr ia_iattr;
26 struct simple_xattrs xattrs;
29 /* +1 to avoid triggering overflow warning when negating it */
30 #define KN_DEACTIVATED_BIAS (INT_MIN + 1)
32 /* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
35 * kernfs_root - find out the kernfs_root a kernfs_node belongs to
36 * @kn: kernfs_node of interest
38 * Return the kernfs_root @kn belongs to.
40 static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
42 /* if parent exists, it's always a dir; otherwise, @sd is a dir */
51 struct kernfs_super_info {
52 struct super_block *sb;
55 * The root associated with this super_block. Each super_block is
56 * identified by the root and ns it's associated with.
58 struct kernfs_root *root;
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.
68 /* anchored at kernfs_root->supers, protected by kernfs_mutex */
69 struct list_head node;
71 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
73 extern const struct super_operations kernfs_sops;
74 extern struct kmem_cache *kernfs_node_cache;
79 extern const struct xattr_handler *kernfs_xattr_handlers[];
80 void kernfs_evict_inode(struct inode *inode);
81 int kernfs_iop_permission(struct inode *inode, int mask);
82 int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
83 int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry,
85 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
90 extern struct mutex kernfs_mutex;
91 extern const struct dentry_operations kernfs_dops;
92 extern const struct file_operations kernfs_dir_fops;
93 extern const struct inode_operations kernfs_dir_iops;
95 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
96 void kernfs_put_active(struct kernfs_node *kn);
97 int kernfs_add_one(struct kernfs_node *kn);
98 struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
99 const char *name, umode_t mode,
105 extern const struct file_operations kernfs_file_fops;
107 void kernfs_unmap_bin_file(struct kernfs_node *kn);
112 extern const struct inode_operations kernfs_symlink_iops;
114 #endif /* __KERNFS_INTERNAL_H */