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146 lines
3.1 KiB
146 lines
3.1 KiB
/* |
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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 *, char *); |
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ssize_t (*store)(struct mapped_device *, const char *, 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, S_IRUGO, 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, S_IRUGO | S_IWUSR, 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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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 struct kobj_type dm_ktype = { |
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.sysfs_ops = &dm_sysfs_ops, |
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.default_attrs = dm_attrs, |
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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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