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 */
49 * Context structure to be used while adding/removing nodes.
51 struct kernfs_addrm_cxt {
52 struct kernfs_node *removed;
58 struct kernfs_super_info {
60 * The root associated with this super_block. Each super_block is
61 * identified by the root and ns it's associated with.
63 struct kernfs_root *root;
66 * Each sb is associated with one namespace tag, currently the
67 * network namespace of the task which mounted this kernfs
68 * instance. If multiple tags become necessary, make the following
69 * an array and compare kernfs_node tag against every entry.
73 #define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
75 extern struct kmem_cache *kernfs_node_cache;
80 struct inode *kernfs_get_inode(struct super_block *sb, struct kernfs_node *kn);
81 void kernfs_evict_inode(struct inode *inode);
82 int kernfs_iop_permission(struct inode *inode, int mask);
83 int kernfs_iop_setattr(struct dentry *dentry, struct iattr *iattr);
84 int kernfs_iop_getattr(struct vfsmount *mnt, struct dentry *dentry,
86 int kernfs_iop_setxattr(struct dentry *dentry, const char *name, const void *value,
87 size_t size, int flags);
88 int kernfs_iop_removexattr(struct dentry *dentry, const char *name);
89 ssize_t kernfs_iop_getxattr(struct dentry *dentry, const char *name, void *buf,
91 ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
92 void kernfs_inode_init(void);
97 extern struct mutex kernfs_mutex;
98 extern const struct dentry_operations kernfs_dops;
99 extern const struct file_operations kernfs_dir_fops;
100 extern const struct inode_operations kernfs_dir_iops;
102 struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
103 void kernfs_put_active(struct kernfs_node *kn);
104 void kernfs_addrm_start(struct kernfs_addrm_cxt *acxt);
105 int kernfs_add_one(struct kernfs_addrm_cxt *acxt, struct kernfs_node *kn,
106 struct kernfs_node *parent);
107 void kernfs_addrm_finish(struct kernfs_addrm_cxt *acxt);
108 struct kernfs_node *kernfs_new_node(struct kernfs_root *root, const char *name,
109 umode_t mode, unsigned flags);
114 extern const struct file_operations kernfs_file_fops;
116 void kernfs_unmap_file(struct kernfs_node *kn);
121 extern const struct inode_operations kernfs_symlink_iops;
123 #endif /* __KERNFS_INTERNAL_H */