551 lines
15 KiB
C
551 lines
15 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* sysfs.h - definitions for the device driver filesystem
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*
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* Copyright (c) 2001,2002 Patrick Mochel
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* Copyright (c) 2004 Silicon Graphics, Inc.
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* Copyright (c) 2007 SUSE Linux Products GmbH
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* Copyright (c) 2007 Tejun Heo <teheo@suse.de>
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*
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* Please see Documentation/filesystems/sysfs.txt for more information.
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*/
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#ifndef _SYSFS_H_
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#define _SYSFS_H_
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#include <linux/kernfs.h>
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#include <linux/compiler.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <linux/lockdep.h>
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#include <linux/kobject_ns.h>
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#include <linux/stat.h>
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#include <linux/atomic.h>
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struct kobject;
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struct module;
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struct bin_attribute;
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enum kobj_ns_type;
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struct attribute {
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const char *name;
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umode_t mode;
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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bool ignore_lockdep:1;
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struct lock_class_key *key;
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struct lock_class_key skey;
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#endif
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};
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/**
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* sysfs_attr_init - initialize a dynamically allocated sysfs attribute
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* @attr: struct attribute to initialize
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*
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* Initialize a dynamically allocated struct attribute so we can
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* make lockdep happy. This is a new requirement for attributes
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* and initially this is only needed when lockdep is enabled.
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* Lockdep gives a nice error when your attribute is added to
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* sysfs if you don't have this.
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*/
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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#define sysfs_attr_init(attr) \
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do { \
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static struct lock_class_key __key; \
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\
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(attr)->key = &__key; \
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} while (0)
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#else
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#define sysfs_attr_init(attr) do {} while (0)
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#endif
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/**
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* struct attribute_group - data structure used to declare an attribute group.
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* @name: Optional: Attribute group name
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* If specified, the attribute group will be created in
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* a new subdirectory with this name.
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* @is_visible: Optional: Function to return permissions associated with an
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* attribute of the group. Will be called repeatedly for each
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* non-binary attribute in the group. Only read/write
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* permissions as well as SYSFS_PREALLOC are accepted. Must
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* return 0 if an attribute is not visible. The returned value
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* will replace static permissions defined in struct attribute.
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* @is_bin_visible:
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* Optional: Function to return permissions associated with a
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* binary attribute of the group. Will be called repeatedly
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* for each binary attribute in the group. Only read/write
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* permissions as well as SYSFS_PREALLOC are accepted. Must
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* return 0 if a binary attribute is not visible. The returned
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* value will replace static permissions defined in
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* struct bin_attribute.
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* @attrs: Pointer to NULL terminated list of attributes.
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* @bin_attrs: Pointer to NULL terminated list of binary attributes.
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* Either attrs or bin_attrs or both must be provided.
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*/
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struct attribute_group {
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const char *name;
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umode_t (*is_visible)(struct kobject *,
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struct attribute *, int);
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umode_t (*is_bin_visible)(struct kobject *,
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struct bin_attribute *, int);
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struct attribute **attrs;
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struct bin_attribute **bin_attrs;
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};
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/*
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* Use these macros to make defining attributes easier.
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* See include/linux/device.h for examples..
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*/
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#define SYSFS_PREALLOC 010000
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#define __ATTR(_name, _mode, _show, _store) { \
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.attr = {.name = __stringify(_name), \
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.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
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.show = _show, \
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.store = _store, \
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}
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#define __ATTR_PREALLOC(_name, _mode, _show, _store) { \
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.attr = {.name = __stringify(_name), \
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.mode = SYSFS_PREALLOC | VERIFY_OCTAL_PERMISSIONS(_mode) },\
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.show = _show, \
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.store = _store, \
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}
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#define __ATTR_RO(_name) { \
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.attr = { .name = __stringify(_name), .mode = 0444 }, \
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.show = _name##_show, \
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}
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#define __ATTR_RO_MODE(_name, _mode) { \
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.attr = { .name = __stringify(_name), \
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.mode = VERIFY_OCTAL_PERMISSIONS(_mode) }, \
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.show = _name##_show, \
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}
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#define __ATTR_WO(_name) { \
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.attr = { .name = __stringify(_name), .mode = 0200 }, \
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.store = _name##_store, \
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}
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#define __ATTR_RW(_name) __ATTR(_name, 0644, _name##_show, _name##_store)
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#define __ATTR_NULL { .attr = { .name = NULL } }
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#ifdef CONFIG_DEBUG_LOCK_ALLOC
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#define __ATTR_IGNORE_LOCKDEP(_name, _mode, _show, _store) { \
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.attr = {.name = __stringify(_name), .mode = _mode, \
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.ignore_lockdep = true }, \
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.show = _show, \
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.store = _store, \
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}
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#else
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#define __ATTR_IGNORE_LOCKDEP __ATTR
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#endif
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#define __ATTRIBUTE_GROUPS(_name) \
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static const struct attribute_group *_name##_groups[] = { \
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&_name##_group, \
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NULL, \
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}
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#define ATTRIBUTE_GROUPS(_name) \
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static const struct attribute_group _name##_group = { \
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.attrs = _name##_attrs, \
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}; \
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__ATTRIBUTE_GROUPS(_name)
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struct file;
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struct vm_area_struct;
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struct bin_attribute {
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struct attribute attr;
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size_t size;
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void *private;
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ssize_t (*read)(struct file *, struct kobject *, struct bin_attribute *,
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char *, loff_t, size_t);
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ssize_t (*write)(struct file *, struct kobject *, struct bin_attribute *,
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char *, loff_t, size_t);
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int (*mmap)(struct file *, struct kobject *, struct bin_attribute *attr,
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struct vm_area_struct *vma);
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};
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/**
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* sysfs_bin_attr_init - initialize a dynamically allocated bin_attribute
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* @attr: struct bin_attribute to initialize
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*
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* Initialize a dynamically allocated struct bin_attribute so we
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* can make lockdep happy. This is a new requirement for
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* attributes and initially this is only needed when lockdep is
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* enabled. Lockdep gives a nice error when your attribute is
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* added to sysfs if you don't have this.
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*/
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#define sysfs_bin_attr_init(bin_attr) sysfs_attr_init(&(bin_attr)->attr)
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/* macros to create static binary attributes easier */
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#define __BIN_ATTR(_name, _mode, _read, _write, _size) { \
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.attr = { .name = __stringify(_name), .mode = _mode }, \
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.read = _read, \
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.write = _write, \
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.size = _size, \
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}
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#define __BIN_ATTR_RO(_name, _size) { \
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.attr = { .name = __stringify(_name), .mode = 0444 }, \
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.read = _name##_read, \
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.size = _size, \
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}
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#define __BIN_ATTR_RW(_name, _size) \
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__BIN_ATTR(_name, 0644, _name##_read, _name##_write, _size)
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#define __BIN_ATTR_NULL __ATTR_NULL
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#define BIN_ATTR(_name, _mode, _read, _write, _size) \
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struct bin_attribute bin_attr_##_name = __BIN_ATTR(_name, _mode, _read, \
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_write, _size)
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#define BIN_ATTR_RO(_name, _size) \
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struct bin_attribute bin_attr_##_name = __BIN_ATTR_RO(_name, _size)
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#define BIN_ATTR_RW(_name, _size) \
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struct bin_attribute bin_attr_##_name = __BIN_ATTR_RW(_name, _size)
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struct sysfs_ops {
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ssize_t (*show)(struct kobject *, struct attribute *, char *);
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ssize_t (*store)(struct kobject *, struct attribute *, const char *, size_t);
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};
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#ifdef CONFIG_SYSFS
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int __must_check sysfs_create_dir_ns(struct kobject *kobj, const void *ns);
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void sysfs_remove_dir(struct kobject *kobj);
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int __must_check sysfs_rename_dir_ns(struct kobject *kobj, const char *new_name,
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const void *new_ns);
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int __must_check sysfs_move_dir_ns(struct kobject *kobj,
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struct kobject *new_parent_kobj,
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const void *new_ns);
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int __must_check sysfs_create_mount_point(struct kobject *parent_kobj,
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const char *name);
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void sysfs_remove_mount_point(struct kobject *parent_kobj,
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const char *name);
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int __must_check sysfs_create_file_ns(struct kobject *kobj,
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const struct attribute *attr,
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const void *ns);
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int __must_check sysfs_create_files(struct kobject *kobj,
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const struct attribute * const *attr);
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int __must_check sysfs_chmod_file(struct kobject *kobj,
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const struct attribute *attr, umode_t mode);
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struct kernfs_node *sysfs_break_active_protection(struct kobject *kobj,
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const struct attribute *attr);
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void sysfs_unbreak_active_protection(struct kernfs_node *kn);
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void sysfs_remove_file_ns(struct kobject *kobj, const struct attribute *attr,
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const void *ns);
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bool sysfs_remove_file_self(struct kobject *kobj, const struct attribute *attr);
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void sysfs_remove_files(struct kobject *kobj, const struct attribute * const *attr);
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int __must_check sysfs_create_bin_file(struct kobject *kobj,
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const struct bin_attribute *attr);
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void sysfs_remove_bin_file(struct kobject *kobj,
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const struct bin_attribute *attr);
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int __must_check sysfs_create_link(struct kobject *kobj, struct kobject *target,
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const char *name);
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int __must_check sysfs_create_link_nowarn(struct kobject *kobj,
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struct kobject *target,
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const char *name);
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void sysfs_remove_link(struct kobject *kobj, const char *name);
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int sysfs_rename_link_ns(struct kobject *kobj, struct kobject *target,
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const char *old_name, const char *new_name,
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const void *new_ns);
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void sysfs_delete_link(struct kobject *dir, struct kobject *targ,
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const char *name);
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int __must_check sysfs_create_group(struct kobject *kobj,
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const struct attribute_group *grp);
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int __must_check sysfs_create_groups(struct kobject *kobj,
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const struct attribute_group **groups);
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int sysfs_update_group(struct kobject *kobj,
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const struct attribute_group *grp);
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void sysfs_remove_group(struct kobject *kobj,
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const struct attribute_group *grp);
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void sysfs_remove_groups(struct kobject *kobj,
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const struct attribute_group **groups);
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int sysfs_add_file_to_group(struct kobject *kobj,
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const struct attribute *attr, const char *group);
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void sysfs_remove_file_from_group(struct kobject *kobj,
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const struct attribute *attr, const char *group);
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int sysfs_merge_group(struct kobject *kobj,
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const struct attribute_group *grp);
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void sysfs_unmerge_group(struct kobject *kobj,
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const struct attribute_group *grp);
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int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
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struct kobject *target, const char *link_name);
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void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
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const char *link_name);
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int __compat_only_sysfs_link_entry_to_kobj(struct kobject *kobj,
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struct kobject *target_kobj,
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const char *target_name);
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void sysfs_notify(struct kobject *kobj, const char *dir, const char *attr);
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int __must_check sysfs_init(void);
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static inline void sysfs_enable_ns(struct kernfs_node *kn)
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{
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return kernfs_enable_ns(kn);
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}
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#else /* CONFIG_SYSFS */
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static inline int sysfs_create_dir_ns(struct kobject *kobj, const void *ns)
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{
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return 0;
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}
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static inline void sysfs_remove_dir(struct kobject *kobj)
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{
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}
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static inline int sysfs_rename_dir_ns(struct kobject *kobj,
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const char *new_name, const void *new_ns)
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{
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return 0;
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}
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static inline int sysfs_move_dir_ns(struct kobject *kobj,
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struct kobject *new_parent_kobj,
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const void *new_ns)
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{
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return 0;
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}
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static inline int sysfs_create_mount_point(struct kobject *parent_kobj,
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const char *name)
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{
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return 0;
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}
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static inline void sysfs_remove_mount_point(struct kobject *parent_kobj,
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const char *name)
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{
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}
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static inline int sysfs_create_file_ns(struct kobject *kobj,
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const struct attribute *attr,
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const void *ns)
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{
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return 0;
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}
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static inline int sysfs_create_files(struct kobject *kobj,
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const struct attribute * const *attr)
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{
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return 0;
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}
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static inline int sysfs_chmod_file(struct kobject *kobj,
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const struct attribute *attr, umode_t mode)
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{
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return 0;
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}
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static inline struct kernfs_node *
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sysfs_break_active_protection(struct kobject *kobj,
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const struct attribute *attr)
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{
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return NULL;
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}
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static inline void sysfs_unbreak_active_protection(struct kernfs_node *kn)
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{
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}
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static inline void sysfs_remove_file_ns(struct kobject *kobj,
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const struct attribute *attr,
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const void *ns)
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{
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}
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static inline bool sysfs_remove_file_self(struct kobject *kobj,
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const struct attribute *attr)
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{
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return false;
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}
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static inline void sysfs_remove_files(struct kobject *kobj,
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const struct attribute * const *attr)
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{
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}
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static inline int sysfs_create_bin_file(struct kobject *kobj,
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const struct bin_attribute *attr)
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{
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return 0;
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}
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static inline void sysfs_remove_bin_file(struct kobject *kobj,
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const struct bin_attribute *attr)
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{
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}
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static inline int sysfs_create_link(struct kobject *kobj,
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struct kobject *target, const char *name)
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{
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return 0;
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}
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static inline int sysfs_create_link_nowarn(struct kobject *kobj,
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struct kobject *target,
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const char *name)
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{
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return 0;
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}
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static inline void sysfs_remove_link(struct kobject *kobj, const char *name)
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{
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}
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static inline int sysfs_rename_link_ns(struct kobject *k, struct kobject *t,
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const char *old_name,
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const char *new_name, const void *ns)
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{
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return 0;
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}
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static inline void sysfs_delete_link(struct kobject *k, struct kobject *t,
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const char *name)
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{
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}
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static inline int sysfs_create_group(struct kobject *kobj,
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const struct attribute_group *grp)
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{
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return 0;
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}
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static inline int sysfs_create_groups(struct kobject *kobj,
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const struct attribute_group **groups)
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{
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return 0;
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}
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static inline int sysfs_update_group(struct kobject *kobj,
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const struct attribute_group *grp)
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{
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return 0;
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}
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static inline void sysfs_remove_group(struct kobject *kobj,
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const struct attribute_group *grp)
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{
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}
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static inline void sysfs_remove_groups(struct kobject *kobj,
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const struct attribute_group **groups)
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{
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}
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static inline int sysfs_add_file_to_group(struct kobject *kobj,
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const struct attribute *attr, const char *group)
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{
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return 0;
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}
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static inline void sysfs_remove_file_from_group(struct kobject *kobj,
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const struct attribute *attr, const char *group)
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{
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}
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static inline int sysfs_merge_group(struct kobject *kobj,
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const struct attribute_group *grp)
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{
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return 0;
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}
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static inline void sysfs_unmerge_group(struct kobject *kobj,
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const struct attribute_group *grp)
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{
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}
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static inline int sysfs_add_link_to_group(struct kobject *kobj,
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const char *group_name, struct kobject *target,
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const char *link_name)
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{
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return 0;
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}
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static inline void sysfs_remove_link_from_group(struct kobject *kobj,
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const char *group_name, const char *link_name)
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{
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}
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static inline int __compat_only_sysfs_link_entry_to_kobj(
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struct kobject *kobj,
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struct kobject *target_kobj,
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const char *target_name)
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{
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return 0;
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}
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static inline void sysfs_notify(struct kobject *kobj, const char *dir,
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const char *attr)
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{
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}
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static inline int __must_check sysfs_init(void)
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{
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return 0;
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}
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static inline void sysfs_enable_ns(struct kernfs_node *kn)
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{
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}
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#endif /* CONFIG_SYSFS */
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static inline int __must_check sysfs_create_file(struct kobject *kobj,
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const struct attribute *attr)
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{
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return sysfs_create_file_ns(kobj, attr, NULL);
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}
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static inline void sysfs_remove_file(struct kobject *kobj,
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const struct attribute *attr)
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{
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sysfs_remove_file_ns(kobj, attr, NULL);
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}
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static inline int sysfs_rename_link(struct kobject *kobj, struct kobject *target,
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const char *old_name, const char *new_name)
|
|
{
|
|
return sysfs_rename_link_ns(kobj, target, old_name, new_name, NULL);
|
|
}
|
|
|
|
static inline void sysfs_notify_dirent(struct kernfs_node *kn)
|
|
{
|
|
kernfs_notify(kn);
|
|
}
|
|
|
|
static inline struct kernfs_node *sysfs_get_dirent(struct kernfs_node *parent,
|
|
const char *name)
|
|
{
|
|
return kernfs_find_and_get(parent, name);
|
|
}
|
|
|
|
static inline struct kernfs_node *sysfs_get(struct kernfs_node *kn)
|
|
{
|
|
kernfs_get(kn);
|
|
return kn;
|
|
}
|
|
|
|
static inline void sysfs_put(struct kernfs_node *kn)
|
|
{
|
|
kernfs_put(kn);
|
|
}
|
|
|
|
#endif /* _SYSFS_H_ */
|