2005-04-17 00:20:36 +02:00
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/*
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* fs/sysfs/group.c - Operations for adding/removing multiple files at once.
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*
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* Copyright (c) 2003 Patrick Mochel
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* Copyright (c) 2003 Open Source Development Lab
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2013-08-22 01:14:11 +02:00
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* Copyright (c) 2013 Greg Kroah-Hartman
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* Copyright (c) 2013 The Linux Foundation
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2005-04-17 00:20:36 +02:00
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*
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2013-08-22 01:06:14 +02:00
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* This file is released undert the GPL v2.
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2005-04-17 00:20:36 +02:00
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*
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*/
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#include <linux/kobject.h>
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#include <linux/module.h>
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#include <linux/dcache.h>
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2005-06-23 09:09:12 +02:00
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#include <linux/namei.h>
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2005-04-17 00:20:36 +02:00
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#include <linux/err.h>
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#include "sysfs.h"
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2013-12-11 20:11:53 +01:00
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static void remove_files(struct kernfs_node *parent, struct kobject *kobj,
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2007-06-13 21:27:22 +02:00
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const struct attribute_group *grp)
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2005-04-17 00:20:36 +02:00
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{
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2013-08-22 01:07:29 +02:00
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struct attribute *const *attr;
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struct bin_attribute *const *bin_attr;
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2005-04-17 00:20:36 +02:00
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2013-07-15 01:05:55 +02:00
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if (grp->attrs)
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for (attr = grp->attrs; *attr; attr++)
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2013-12-11 20:11:53 +01:00
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kernfs_remove_by_name(parent, (*attr)->name);
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2013-07-15 01:05:55 +02:00
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if (grp->bin_attrs)
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for (bin_attr = grp->bin_attrs; *bin_attr; bin_attr++)
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sysfs_remove_bin_file(kobj, *bin_attr);
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2005-04-17 00:20:36 +02:00
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}
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2013-12-11 20:11:53 +01:00
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static int create_files(struct kernfs_node *parent, struct kobject *kobj,
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2008-03-21 02:47:52 +01:00
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const struct attribute_group *grp, int update)
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2005-04-17 00:20:36 +02:00
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{
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2013-08-22 01:07:29 +02:00
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struct attribute *const *attr;
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struct bin_attribute *const *bin_attr;
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2007-10-31 15:38:04 +01:00
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int error = 0, i;
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2005-04-17 00:20:36 +02:00
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2013-07-15 01:05:55 +02:00
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if (grp->attrs) {
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for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++) {
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umode_t mode = 0;
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2008-03-21 02:47:52 +01:00
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2013-07-15 01:05:55 +02:00
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/*
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* In update mode, we're changing the permissions or
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* visibility. Do this by first removing then
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* re-adding (if required) the file.
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*/
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if (update)
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2013-12-11 20:11:53 +01:00
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kernfs_remove_by_name(parent, (*attr)->name);
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2013-07-15 01:05:55 +02:00
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if (grp->is_visible) {
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mode = grp->is_visible(kobj, *attr, i);
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if (!mode)
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continue;
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}
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2013-12-11 20:11:53 +01:00
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error = sysfs_add_file_mode_ns(parent, *attr, false,
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2013-09-12 04:29:04 +02:00
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(*attr)->mode | mode,
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NULL);
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2013-07-15 01:05:55 +02:00
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if (unlikely(error))
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break;
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}
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if (error) {
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2013-12-11 20:11:53 +01:00
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remove_files(parent, kobj, grp);
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2013-07-15 01:05:55 +02:00
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goto exit;
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}
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}
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if (grp->bin_attrs) {
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for (bin_attr = grp->bin_attrs; *bin_attr; bin_attr++) {
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if (update)
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2014-02-14 23:02:07 +01:00
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kernfs_remove_by_name(parent,
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(*bin_attr)->attr.name);
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error = sysfs_add_file_mode_ns(parent,
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&(*bin_attr)->attr, true,
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(*bin_attr)->attr.mode, NULL);
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2013-07-15 01:05:55 +02:00
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if (error)
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break;
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2008-03-21 02:47:52 +01:00
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}
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2013-07-15 01:05:55 +02:00
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if (error)
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2013-12-11 20:11:53 +01:00
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remove_files(parent, kobj, grp);
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2008-03-21 02:47:52 +01:00
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}
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2013-07-15 01:05:55 +02:00
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exit:
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2005-04-17 00:20:36 +02:00
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return error;
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}
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2008-03-21 02:47:52 +01:00
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static int internal_create_group(struct kobject *kobj, int update,
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const struct attribute_group *grp)
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2005-04-17 00:20:36 +02:00
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{
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2013-12-11 20:11:53 +01:00
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struct kernfs_node *kn;
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2005-04-17 00:20:36 +02:00
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int error;
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2008-03-21 02:47:52 +01:00
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BUG_ON(!kobj || (!update && !kobj->sd));
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/* Updates may happen before the object has been instantiated */
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if (unlikely(update && !kobj->sd))
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return -EINVAL;
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2013-07-15 01:05:56 +02:00
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if (!grp->attrs && !grp->bin_attrs) {
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WARN(1, "sysfs: (bin_)attrs not set by subsystem for group: %s/%s\n",
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2012-04-03 09:59:48 +02:00
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kobj->name, grp->name ? "" : grp->name);
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return -EINVAL;
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}
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2005-04-17 00:20:36 +02:00
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if (grp->name) {
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2013-12-11 22:02:55 +01:00
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kn = kernfs_create_dir(kobj->sd, grp->name,
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S_IRWXU | S_IRUGO | S_IXUGO, kobj);
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2013-12-11 20:11:53 +01:00
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if (IS_ERR(kn)) {
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if (PTR_ERR(kn) == -EEXIST)
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2013-11-28 20:54:15 +01:00
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sysfs_warn_dup(kobj->sd, grp->name);
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2013-12-11 20:11:53 +01:00
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return PTR_ERR(kn);
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2013-11-28 20:54:15 +01:00
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}
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2005-04-17 00:20:36 +02:00
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} else
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2013-12-11 20:11:53 +01:00
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kn = kobj->sd;
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kernfs_get(kn);
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error = create_files(kn, kobj, grp, update);
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2007-06-13 21:27:22 +02:00
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if (error) {
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2005-04-17 00:20:36 +02:00
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if (grp->name)
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2013-12-11 20:11:53 +01:00
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kernfs_remove(kn);
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2005-04-17 00:20:36 +02:00
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}
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2013-12-11 20:11:53 +01:00
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kernfs_put(kn);
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2005-04-17 00:20:36 +02:00
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return error;
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}
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2008-03-21 02:47:52 +01:00
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/**
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* sysfs_create_group - given a directory kobject, create an attribute group
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* @kobj: The kobject to create the group on
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* @grp: The attribute group to create
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*
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* This function creates a group for the first time. It will explicitly
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* warn and error if any of the attribute files being created already exist.
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*
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* Returns 0 on success or error.
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*/
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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 internal_create_group(kobj, 0, grp);
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}
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2013-08-22 01:04:12 +02:00
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EXPORT_SYMBOL_GPL(sysfs_create_group);
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2008-03-21 02:47:52 +01:00
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2013-08-21 22:47:50 +02:00
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/**
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* sysfs_create_groups - given a directory kobject, create a bunch of attribute groups
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* @kobj: The kobject to create the group on
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* @groups: The attribute groups to create, NULL terminated
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*
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* This function creates a bunch of attribute groups. If an error occurs when
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* creating a group, all previously created groups will be removed, unwinding
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* everything back to the original state when this function was called.
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* It will explicitly warn and error if any of the attribute files being
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* created already exist.
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*
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2013-08-22 18:23:28 +02:00
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* Returns 0 on success or error code from sysfs_create_group on error.
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2013-08-21 22:47:50 +02:00
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*/
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int sysfs_create_groups(struct kobject *kobj,
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const struct attribute_group **groups)
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{
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int error = 0;
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int i;
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if (!groups)
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return 0;
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for (i = 0; groups[i]; i++) {
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error = sysfs_create_group(kobj, groups[i]);
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if (error) {
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while (--i >= 0)
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sysfs_remove_group(kobj, groups[i]);
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break;
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}
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}
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return error;
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}
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EXPORT_SYMBOL_GPL(sysfs_create_groups);
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2008-03-21 02:47:52 +01:00
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/**
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2011-05-07 23:18:20 +02:00
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* sysfs_update_group - given a directory kobject, update an attribute group
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* @kobj: The kobject to update the group on
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* @grp: The attribute group to update
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2008-03-21 02:47:52 +01:00
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*
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* This function updates an attribute group. Unlike
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* sysfs_create_group(), it will explicitly not warn or error if any
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* of the attribute files being created already exist. Furthermore,
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* if the visibility of the files has changed through the is_visible()
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* callback, it will update the permissions and add or remove the
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* relevant files.
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*
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* The primary use for this function is to call it after making a change
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* that affects group visibility.
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*
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* Returns 0 on success or error.
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*/
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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 internal_create_group(kobj, 1, grp);
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}
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2013-08-22 01:04:12 +02:00
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EXPORT_SYMBOL_GPL(sysfs_update_group);
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2008-03-21 02:47:52 +01:00
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2013-08-22 01:12:34 +02:00
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/**
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* sysfs_remove_group: remove a group from a kobject
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* @kobj: kobject to remove the group from
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* @grp: group to remove
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*
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* This function removes a group of attributes from a kobject. The attributes
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* previously have to have been created for this group, otherwise it will fail.
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*/
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2013-08-22 01:07:29 +02:00
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void sysfs_remove_group(struct kobject *kobj,
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const struct attribute_group *grp)
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2005-04-17 00:20:36 +02:00
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{
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2013-12-11 20:11:53 +01:00
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struct kernfs_node *parent = kobj->sd;
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struct kernfs_node *kn;
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2005-04-17 00:20:36 +02:00
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2007-04-26 09:12:05 +02:00
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if (grp->name) {
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2013-12-11 20:11:53 +01:00
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kn = kernfs_find_and_get(parent, grp->name);
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if (!kn) {
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WARN(!kn, KERN_WARNING
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2013-08-22 01:10:02 +02:00
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"sysfs group %p not found for kobject '%s'\n",
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grp, kobject_name(kobj));
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2008-02-07 17:58:54 +01:00
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return;
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}
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2013-11-28 20:54:30 +01:00
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} else {
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2013-12-11 20:11:53 +01:00
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kn = parent;
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kernfs_get(kn);
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2013-11-28 20:54:30 +01:00
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}
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2005-04-17 00:20:36 +02:00
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2013-12-11 20:11:53 +01:00
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remove_files(kn, kobj, grp);
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2005-04-17 00:20:36 +02:00
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if (grp->name)
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2013-12-11 20:11:53 +01:00
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kernfs_remove(kn);
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2007-06-13 21:27:22 +02:00
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2013-12-11 20:11:53 +01:00
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kernfs_put(kn);
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2005-04-17 00:20:36 +02:00
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}
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2013-08-22 01:04:12 +02:00
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EXPORT_SYMBOL_GPL(sysfs_remove_group);
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2005-04-17 00:20:36 +02:00
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2013-08-21 22:47:50 +02:00
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/**
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* sysfs_remove_groups - remove a list of groups
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*
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2013-08-22 01:12:34 +02:00
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* @kobj: The kobject for the groups to be removed from
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* @groups: NULL terminated list of groups to be removed
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2013-08-21 22:47:50 +02:00
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*
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2013-08-22 18:23:28 +02:00
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* If groups is not NULL, remove the specified groups from the kobject.
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2013-08-21 22:47:50 +02:00
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*/
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void sysfs_remove_groups(struct kobject *kobj,
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const struct attribute_group **groups)
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{
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int i;
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if (!groups)
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return;
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for (i = 0; groups[i]; i++)
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sysfs_remove_group(kobj, groups[i]);
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}
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EXPORT_SYMBOL_GPL(sysfs_remove_groups);
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2010-09-25 23:34:22 +02:00
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/**
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* sysfs_merge_group - merge files into a pre-existing attribute group.
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* @kobj: The kobject containing the group.
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* @grp: The files to create and the attribute group they belong to.
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*
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* This function returns an error if the group doesn't exist or any of the
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* files already exist in that group, in which case none of the new files
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* are created.
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*/
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int sysfs_merge_group(struct kobject *kobj,
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const struct attribute_group *grp)
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{
|
2013-12-11 20:11:53 +01:00
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struct kernfs_node *parent;
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2010-09-25 23:34:22 +02:00
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int error = 0;
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struct attribute *const *attr;
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int i;
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|
2013-12-11 20:11:53 +01:00
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parent = kernfs_find_and_get(kobj->sd, grp->name);
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if (!parent)
|
2010-09-25 23:34:22 +02:00
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return -ENOENT;
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for ((i = 0, attr = grp->attrs); *attr && !error; (++i, ++attr))
|
2013-12-11 20:11:53 +01:00
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error = sysfs_add_file(parent, *attr, false);
|
2010-09-25 23:34:22 +02:00
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if (error) {
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while (--i >= 0)
|
2013-12-11 20:11:53 +01:00
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kernfs_remove_by_name(parent, (*--attr)->name);
|
2010-09-25 23:34:22 +02:00
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}
|
2013-12-11 20:11:53 +01:00
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kernfs_put(parent);
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2010-09-25 23:34:22 +02:00
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return error;
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}
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EXPORT_SYMBOL_GPL(sysfs_merge_group);
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/**
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* sysfs_unmerge_group - remove files from a pre-existing attribute group.
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* @kobj: The kobject containing the group.
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* @grp: The files to remove and the attribute group they belong to.
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*/
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void sysfs_unmerge_group(struct kobject *kobj,
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const struct attribute_group *grp)
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|
|
{
|
2013-12-11 20:11:53 +01:00
|
|
|
struct kernfs_node *parent;
|
2010-09-25 23:34:22 +02:00
|
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struct attribute *const *attr;
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|
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|
2013-12-11 20:11:53 +01:00
|
|
|
parent = kernfs_find_and_get(kobj->sd, grp->name);
|
|
|
|
if (parent) {
|
2010-09-25 23:34:22 +02:00
|
|
|
for (attr = grp->attrs; *attr; ++attr)
|
2013-12-11 20:11:53 +01:00
|
|
|
kernfs_remove_by_name(parent, (*attr)->name);
|
|
|
|
kernfs_put(parent);
|
2010-09-25 23:34:22 +02:00
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sysfs_unmerge_group);
|
|
|
|
|
2013-01-25 21:51:13 +01:00
|
|
|
/**
|
|
|
|
* sysfs_add_link_to_group - add a symlink to an attribute group.
|
|
|
|
* @kobj: The kobject containing the group.
|
|
|
|
* @group_name: The name of the group.
|
|
|
|
* @target: The target kobject of the symlink to create.
|
|
|
|
* @link_name: The name of the symlink to create.
|
|
|
|
*/
|
|
|
|
int sysfs_add_link_to_group(struct kobject *kobj, const char *group_name,
|
|
|
|
struct kobject *target, const char *link_name)
|
|
|
|
{
|
2013-12-11 20:11:53 +01:00
|
|
|
struct kernfs_node *parent;
|
2013-01-25 21:51:13 +01:00
|
|
|
int error = 0;
|
|
|
|
|
2013-12-11 20:11:53 +01:00
|
|
|
parent = kernfs_find_and_get(kobj->sd, group_name);
|
|
|
|
if (!parent)
|
2013-01-25 21:51:13 +01:00
|
|
|
return -ENOENT;
|
|
|
|
|
2013-12-11 20:11:53 +01:00
|
|
|
error = sysfs_create_link_sd(parent, target, link_name);
|
|
|
|
kernfs_put(parent);
|
2013-01-25 21:51:13 +01:00
|
|
|
|
|
|
|
return error;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sysfs_add_link_to_group);
|
|
|
|
|
|
|
|
/**
|
|
|
|
* sysfs_remove_link_from_group - remove a symlink from an attribute group.
|
|
|
|
* @kobj: The kobject containing the group.
|
|
|
|
* @group_name: The name of the group.
|
|
|
|
* @link_name: The name of the symlink to remove.
|
|
|
|
*/
|
|
|
|
void sysfs_remove_link_from_group(struct kobject *kobj, const char *group_name,
|
|
|
|
const char *link_name)
|
|
|
|
{
|
2013-12-11 20:11:53 +01:00
|
|
|
struct kernfs_node *parent;
|
2013-01-25 21:51:13 +01:00
|
|
|
|
2013-12-11 20:11:53 +01:00
|
|
|
parent = kernfs_find_and_get(kobj->sd, group_name);
|
|
|
|
if (parent) {
|
|
|
|
kernfs_remove_by_name(parent, link_name);
|
|
|
|
kernfs_put(parent);
|
2013-01-25 21:51:13 +01:00
|
|
|
}
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(sysfs_remove_link_from_group);
|