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b0bbd86a28
Since commit ee6d3dd4ed ("driver core: make kobj_type constant.")
the driver core allows the usage of const struct kobj_type.
Take advantage of this to constify the structure definition to prevent
modification at runtime.
Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
150 lines
3.2 KiB
C
150 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2008 Red Hat, Inc. All rights reserved.
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*
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* This file is released under the GPL.
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*/
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#include <linux/sysfs.h>
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#include <linux/dm-ioctl.h>
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#include "dm-core.h"
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#include "dm-rq.h"
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struct dm_sysfs_attr {
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struct attribute attr;
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ssize_t (*show)(struct mapped_device *md, char *p);
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ssize_t (*store)(struct mapped_device *md, const char *p, size_t count);
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};
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#define DM_ATTR_RO(_name) \
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struct dm_sysfs_attr dm_attr_##_name = \
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__ATTR(_name, 0444, dm_attr_##_name##_show, NULL)
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static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr,
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char *page)
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{
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struct dm_sysfs_attr *dm_attr;
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struct mapped_device *md;
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ssize_t ret;
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dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
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if (!dm_attr->show)
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return -EIO;
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md = dm_get_from_kobject(kobj);
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if (!md)
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return -EINVAL;
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ret = dm_attr->show(md, page);
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dm_put(md);
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return ret;
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}
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#define DM_ATTR_RW(_name) \
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struct dm_sysfs_attr dm_attr_##_name = \
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__ATTR(_name, 0644, dm_attr_##_name##_show, dm_attr_##_name##_store)
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static ssize_t dm_attr_store(struct kobject *kobj, struct attribute *attr,
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const char *page, size_t count)
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{
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struct dm_sysfs_attr *dm_attr;
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struct mapped_device *md;
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ssize_t ret;
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dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
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if (!dm_attr->store)
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return -EIO;
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md = dm_get_from_kobject(kobj);
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if (!md)
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return -EINVAL;
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ret = dm_attr->store(md, page, count);
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dm_put(md);
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return ret;
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}
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static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf)
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{
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if (dm_copy_name_and_uuid(md, buf, NULL))
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return -EIO;
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strcat(buf, "\n");
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return strlen(buf);
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}
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static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf)
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{
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if (dm_copy_name_and_uuid(md, NULL, buf))
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return -EIO;
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strcat(buf, "\n");
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return strlen(buf);
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}
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static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
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{
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sprintf(buf, "%d\n", dm_suspended_md(md));
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return strlen(buf);
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}
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static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf)
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{
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/* Purely for userspace compatibility */
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sprintf(buf, "%d\n", true);
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return strlen(buf);
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}
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static DM_ATTR_RO(name);
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static DM_ATTR_RO(uuid);
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static DM_ATTR_RO(suspended);
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static DM_ATTR_RO(use_blk_mq);
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static DM_ATTR_RW(rq_based_seq_io_merge_deadline);
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static struct attribute *dm_attrs[] = {
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&dm_attr_name.attr,
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&dm_attr_uuid.attr,
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&dm_attr_suspended.attr,
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&dm_attr_use_blk_mq.attr,
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&dm_attr_rq_based_seq_io_merge_deadline.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(dm);
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static const struct sysfs_ops dm_sysfs_ops = {
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.show = dm_attr_show,
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.store = dm_attr_store,
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};
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static const struct kobj_type dm_ktype = {
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.sysfs_ops = &dm_sysfs_ops,
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.default_groups = dm_groups,
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.release = dm_kobject_release,
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};
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/*
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* Initialize kobj
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* because nobody using md yet, no need to call explicit dm_get/put
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*/
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int dm_sysfs_init(struct mapped_device *md)
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{
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return kobject_init_and_add(dm_kobject(md), &dm_ktype,
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&disk_to_dev(dm_disk(md))->kobj,
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"%s", "dm");
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}
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/*
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* Remove kobj, called after all references removed
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*/
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void dm_sysfs_exit(struct mapped_device *md)
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{
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struct kobject *kobj = dm_kobject(md);
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kobject_put(kobj);
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wait_for_completion(dm_get_completion_from_kobject(kobj));
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}
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