d4acd722b7
This patch allows the various users of attribute_groups to selectively allow the appearance of group attributes. The primary consumer of this will be the transport classes in which we currently have elaborate attribute selection algorithms to do this same thing. Acked-by: Greg KH <greg@kroah.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
94 lines
2.0 KiB
C
94 lines
2.0 KiB
C
/*
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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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*
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* This file is released undert the GPL v2.
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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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#include <linux/namei.h>
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#include <linux/err.h>
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#include "sysfs.h"
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static void remove_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
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const struct attribute_group *grp)
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{
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struct attribute *const* attr;
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int i;
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for (i = 0, attr = grp->attrs; *attr; i++, attr++)
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if (!grp->is_visible ||
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grp->is_visible(kobj, *attr, i))
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sysfs_hash_and_remove(dir_sd, (*attr)->name);
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}
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static int create_files(struct sysfs_dirent *dir_sd, struct kobject *kobj,
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const struct attribute_group *grp)
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{
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struct attribute *const* attr;
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int error = 0, i;
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for (i = 0, attr = grp->attrs; *attr && !error; i++, attr++)
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if (!grp->is_visible ||
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grp->is_visible(kobj, *attr, i))
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error |=
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sysfs_add_file(dir_sd, *attr, SYSFS_KOBJ_ATTR);
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if (error)
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remove_files(dir_sd, kobj, grp);
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return 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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struct sysfs_dirent *sd;
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int error;
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BUG_ON(!kobj || !kobj->sd);
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if (grp->name) {
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error = sysfs_create_subdir(kobj, grp->name, &sd);
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if (error)
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return error;
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} else
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sd = kobj->sd;
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sysfs_get(sd);
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error = create_files(sd, kobj, grp);
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if (error) {
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if (grp->name)
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sysfs_remove_subdir(sd);
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}
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sysfs_put(sd);
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return error;
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}
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void sysfs_remove_group(struct kobject * kobj,
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const struct attribute_group * grp)
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{
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struct sysfs_dirent *dir_sd = kobj->sd;
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struct sysfs_dirent *sd;
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if (grp->name) {
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sd = sysfs_get_dirent(dir_sd, grp->name);
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BUG_ON(!sd);
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} else
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sd = sysfs_get(dir_sd);
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remove_files(sd, kobj, grp);
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if (grp->name)
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sysfs_remove_subdir(sd);
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sysfs_put(sd);
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}
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EXPORT_SYMBOL_GPL(sysfs_create_group);
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EXPORT_SYMBOL_GPL(sysfs_remove_group);
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