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/rwsem.h>
 17#include <linux/xattr.h>
 18
 19#include <linux/kernfs.h>
 20#include <linux/fs_context.h>
 21
 22struct kernfs_iattrs {
 23	kuid_t			ia_uid;
 24	kgid_t			ia_gid;
 25	struct timespec64	ia_atime;
 26	struct timespec64	ia_mtime;
 27	struct timespec64	ia_ctime;
 28
 29	struct simple_xattrs	xattrs;
 30	atomic_t		nr_user_xattrs;
 31	atomic_t		user_xattr_size;
 32};
 33
 34struct kernfs_root {
 35	/* published fields */
 36	struct kernfs_node	*kn;
 37	unsigned int		flags;	/* KERNFS_ROOT_* flags */
 38
 39	/* private fields, do not use outside kernfs proper */
 40	struct idr		ino_idr;
 41	u32			last_id_lowbits;
 42	u32			id_highbits;
 43	struct kernfs_syscall_ops *syscall_ops;
 44
 45	/* list of kernfs_super_info of this root, protected by kernfs_rwsem */
 46	struct list_head	supers;
 47
 48	wait_queue_head_t	deactivate_waitq;
 49	struct rw_semaphore	kernfs_rwsem;
 50	struct rw_semaphore	kernfs_iattr_rwsem;
 51	struct rw_semaphore	kernfs_supers_rwsem;
 52};
 53
 54/* +1 to avoid triggering overflow warning when negating it */
 55#define KN_DEACTIVATED_BIAS		(INT_MIN + 1)
 56
 57/* KERNFS_TYPE_MASK and types are defined in include/linux/kernfs.h */
 58
 59/**
 60 * kernfs_root - find out the kernfs_root a kernfs_node belongs to
 61 * @kn: kernfs_node of interest
 62 *
 63 * Return: the kernfs_root @kn belongs to.
 64 */
 65static inline struct kernfs_root *kernfs_root(struct kernfs_node *kn)
 66{
 67	/* if parent exists, it's always a dir; otherwise, @sd is a dir */
 68	if (kn->parent)
 69		kn = kn->parent;
 70	return kn->dir.root;
 71}
 72
 73/*
 74 * mount.c
 75 */
 76struct kernfs_super_info {
 77	struct super_block	*sb;
 78
 79	/*
 80	 * The root associated with this super_block.  Each super_block is
 81	 * identified by the root and ns it's associated with.
 82	 */
 83	struct kernfs_root	*root;
 84
 85	/*
 86	 * Each sb is associated with one namespace tag, currently the
 87	 * network namespace of the task which mounted this kernfs
 88	 * instance.  If multiple tags become necessary, make the following
 89	 * an array and compare kernfs_node tag against every entry.
 90	 */
 91	const void		*ns;
 92
 93	/* anchored at kernfs_root->supers, protected by kernfs_rwsem */
 94	struct list_head	node;
 95};
 96#define kernfs_info(SB) ((struct kernfs_super_info *)(SB->s_fs_info))
 97
 98static inline struct kernfs_node *kernfs_dentry_node(struct dentry *dentry)
 99{
100	if (d_really_is_negative(dentry))
101		return NULL;
102	return d_inode(dentry)->i_private;
103}
104
105static inline void kernfs_set_rev(struct kernfs_node *parent,
106				  struct dentry *dentry)
107{
108	dentry->d_time = parent->dir.rev;
109}
110
111static inline void kernfs_inc_rev(struct kernfs_node *parent)
112{
113	parent->dir.rev++;
114}
115
116static inline bool kernfs_dir_changed(struct kernfs_node *parent,
117				      struct dentry *dentry)
118{
119	if (parent->dir.rev != dentry->d_time)
120		return true;
121	return false;
122}
123
124extern const struct super_operations kernfs_sops;
125extern struct kmem_cache *kernfs_node_cache, *kernfs_iattrs_cache;
126
127/*
128 * inode.c
129 */
130extern const struct xattr_handler * const kernfs_xattr_handlers[];
131void kernfs_evict_inode(struct inode *inode);
132int kernfs_iop_permission(struct mnt_idmap *idmap,
133			  struct inode *inode, int mask);
134int kernfs_iop_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
135		       struct iattr *iattr);
136int kernfs_iop_getattr(struct mnt_idmap *idmap,
137		       const struct path *path, struct kstat *stat,
138		       u32 request_mask, unsigned int query_flags);
139ssize_t kernfs_iop_listxattr(struct dentry *dentry, char *buf, size_t size);
140int __kernfs_setattr(struct kernfs_node *kn, const struct iattr *iattr);
141
142/*
143 * dir.c
144 */
 
145extern const struct dentry_operations kernfs_dops;
146extern const struct file_operations kernfs_dir_fops;
147extern const struct inode_operations kernfs_dir_iops;
148
149struct kernfs_node *kernfs_get_active(struct kernfs_node *kn);
150void kernfs_put_active(struct kernfs_node *kn);
151int kernfs_add_one(struct kernfs_node *kn);
152struct kernfs_node *kernfs_new_node(struct kernfs_node *parent,
153				    const char *name, umode_t mode,
154				    kuid_t uid, kgid_t gid,
155				    unsigned flags);
 
 
156
157/*
158 * file.c
159 */
160extern const struct file_operations kernfs_file_fops;
161
162bool kernfs_should_drain_open_files(struct kernfs_node *kn);
163void kernfs_drain_open_files(struct kernfs_node *kn);
164
165/*
166 * symlink.c
167 */
168extern const struct inode_operations kernfs_symlink_iops;
169
170/*
171 * kernfs locks
172 */
173extern struct kernfs_global_locks *kernfs_locks;
174#endif	/* __KERNFS_INTERNAL_H */