91a6902958
Well, first of all, I don't want to change so many files either. What I do: Adding a new parameter "struct bin_attribute *" in the .read/.write methods for the sysfs binary attributes. In fact, only the four lines change in fs/sysfs/bin.c and include/linux/sysfs.h do the real work. But I have to update all the files that use binary attributes to make them compatible with the new .read and .write methods. I'm not sure if I missed any. :( Why I do this: For a sysfs attribute, we can get a pointer pointing to the struct attribute in the .show/.store method, while we can't do this for the binary attributes. I don't know why this is different, but this does make it not so handy to use the binary attributes as the regular ones. So I think this patch is reasonable. :) Who benefits from it: The patch that exposes ACPI tables in sysfs requires such an improvement. All the table binary attributes share the same .read method. Parameter "struct bin_attribute *" is used to get the table signature and instance number which are used to distinguish different ACPI table binary attributes. Without this parameter, we need to offer different .read methods for different ACPI table binary attributes. This is impossible as there are various ACPI tables on different platforms, and we don't know what they are until they are loaded. Signed-off-by: Zhang Rui <rui.zhang@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
258 lines
6.1 KiB
C
258 lines
6.1 KiB
C
/*
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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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*
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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/compiler.h>
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#include <linux/errno.h>
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#include <linux/list.h>
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#include <asm/atomic.h>
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struct kobject;
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struct module;
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struct nameidata;
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struct dentry;
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struct sysfs_dirent;
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/* FIXME
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* The *owner field is no longer used, but leave around
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* until the tree gets cleaned up fully.
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*/
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struct attribute {
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const char * name;
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struct module * owner;
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mode_t mode;
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};
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struct attribute_group {
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const char * name;
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struct attribute ** attrs;
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};
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/**
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* Use these macros to make defining attributes easier. See include/linux/device.h
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* for examples..
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*/
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#define __ATTR(_name,_mode,_show,_store) { \
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.attr = {.name = __stringify(_name), .mode = _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_NULL { .attr = { .name = NULL } }
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#define attr_name(_attr) (_attr).attr.name
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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 kobject *, struct bin_attribute *,
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char *, loff_t, size_t);
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ssize_t (*write)(struct kobject *, struct bin_attribute *,
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char *, loff_t, size_t);
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int (*mmap)(struct kobject *, struct bin_attribute *attr,
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struct vm_area_struct *vma);
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};
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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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#define SYSFS_TYPE_MASK 0x00ff
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#define SYSFS_ROOT 0x0001
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#define SYSFS_DIR 0x0002
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#define SYSFS_KOBJ_ATTR 0x0004
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#define SYSFS_KOBJ_BIN_ATTR 0x0008
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#define SYSFS_KOBJ_LINK 0x0020
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#define SYSFS_COPY_NAME (SYSFS_DIR | SYSFS_KOBJ_LINK)
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#define SYSFS_FLAG_MASK ~SYSFS_TYPE_MASK
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#define SYSFS_FLAG_REMOVED 0x0100
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#ifdef CONFIG_SYSFS
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extern int sysfs_schedule_callback(struct kobject *kobj,
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void (*func)(void *), void *data, struct module *owner);
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extern int __must_check
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sysfs_create_dir(struct kobject *kobj, struct sysfs_dirent *shadow_parent_sd);
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extern void
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sysfs_remove_dir(struct kobject *);
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extern int __must_check
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sysfs_rename_dir(struct kobject *kobj, struct sysfs_dirent *new_parent_sd,
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const char *new_name);
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extern int __must_check
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sysfs_move_dir(struct kobject *, struct kobject *);
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extern int __must_check
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sysfs_create_file(struct kobject *, const struct attribute *);
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extern int __must_check
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sysfs_update_file(struct kobject *, const struct attribute *);
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extern int __must_check
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sysfs_chmod_file(struct kobject *kobj, struct attribute *attr, mode_t mode);
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extern void
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sysfs_remove_file(struct kobject *, const struct attribute *);
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extern int __must_check
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sysfs_create_link(struct kobject * kobj, struct kobject * target, const char * name);
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extern void
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sysfs_remove_link(struct kobject *, const char * name);
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int __must_check sysfs_create_bin_file(struct kobject *kobj,
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struct bin_attribute *attr);
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void sysfs_remove_bin_file(struct kobject *kobj, struct bin_attribute *attr);
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int __must_check sysfs_create_group(struct kobject *,
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const struct attribute_group *);
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void sysfs_remove_group(struct kobject *, const struct attribute_group *);
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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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void sysfs_notify(struct kobject * k, char *dir, char *attr);
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extern int sysfs_make_shadowed_dir(struct kobject *kobj,
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void * (*follow_link)(struct dentry *, struct nameidata *));
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extern struct sysfs_dirent *sysfs_create_shadow_dir(struct kobject *kobj);
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extern void sysfs_remove_shadow_dir(struct sysfs_dirent *shadow_sd);
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extern int __must_check sysfs_init(void);
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#else /* CONFIG_SYSFS */
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static inline int sysfs_schedule_callback(struct kobject *kobj,
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void (*func)(void *), void *data, struct module *owner)
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{
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return -ENOSYS;
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}
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static inline int sysfs_create_dir(struct kobject *kobj,
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struct sysfs_dirent *shadow_parent_sd)
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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 * k)
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{
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;
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}
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static inline int sysfs_rename_dir(struct kobject *kobj,
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struct sysfs_dirent *new_parent_sd,
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const char *new_name)
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{
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return 0;
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}
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static inline int sysfs_move_dir(struct kobject * k, struct kobject * new_parent)
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{
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return 0;
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}
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static inline int sysfs_create_file(struct kobject * k, const struct attribute * a)
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{
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return 0;
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}
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static inline int sysfs_update_file(struct kobject * k, const struct attribute * a)
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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, struct attribute *attr, mode_t mode)
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{
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return 0;
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}
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static inline void sysfs_remove_file(struct kobject * k, const struct attribute * a)
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{
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;
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}
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static inline int sysfs_create_link(struct kobject * k, struct kobject * t, const char * n)
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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 * k, const char * name)
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{
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;
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}
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static inline int sysfs_create_bin_file(struct kobject * k, struct bin_attribute * a)
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{
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return 0;
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}
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static inline int sysfs_remove_bin_file(struct kobject * k, struct bin_attribute * a)
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{
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return 0;
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}
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static inline int sysfs_create_group(struct kobject * k, const struct attribute_group *g)
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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 * k, const struct attribute_group * g)
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{
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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 void sysfs_notify(struct kobject * k, char *dir, char *attr)
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{
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}
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static inline int sysfs_make_shadowed_dir(struct kobject *kobj,
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void * (*follow_link)(struct dentry *, struct nameidata *))
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{
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return 0;
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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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#endif /* CONFIG_SYSFS */
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#endif /* _SYSFS_H_ */
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