mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-28 15:13:55 +08:00
17e149b8f7
Request-based DM's blk-mq support defaults to off; but a user can easily change the default using the dm_mod.use_blk_mq module/boot option. Also, you can check what mode a given request-based DM device is using with: cat /sys/block/dm-X/dm/use_blk_mq This change enabled further cleanup and reduced work (e.g. the md->io_pool and md->rq_pool isn't created if using blk-mq). Signed-off-by: Mike Snitzer <snitzer@redhat.com>
145 lines
3.1 KiB
C
145 lines
3.1 KiB
C
/*
|
|
* Copyright (C) 2008 Red Hat, Inc. All rights reserved.
|
|
*
|
|
* This file is released under the GPL.
|
|
*/
|
|
|
|
#include <linux/sysfs.h>
|
|
#include <linux/dm-ioctl.h>
|
|
#include "dm.h"
|
|
|
|
struct dm_sysfs_attr {
|
|
struct attribute attr;
|
|
ssize_t (*show)(struct mapped_device *, char *);
|
|
ssize_t (*store)(struct mapped_device *, const char *, size_t count);
|
|
};
|
|
|
|
#define DM_ATTR_RO(_name) \
|
|
struct dm_sysfs_attr dm_attr_##_name = \
|
|
__ATTR(_name, S_IRUGO, dm_attr_##_name##_show, NULL)
|
|
|
|
static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr,
|
|
char *page)
|
|
{
|
|
struct dm_sysfs_attr *dm_attr;
|
|
struct mapped_device *md;
|
|
ssize_t ret;
|
|
|
|
dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
|
|
if (!dm_attr->show)
|
|
return -EIO;
|
|
|
|
md = dm_get_from_kobject(kobj);
|
|
if (!md)
|
|
return -EINVAL;
|
|
|
|
ret = dm_attr->show(md, page);
|
|
dm_put(md);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#define DM_ATTR_RW(_name) \
|
|
struct dm_sysfs_attr dm_attr_##_name = \
|
|
__ATTR(_name, S_IRUGO | S_IWUSR, dm_attr_##_name##_show, dm_attr_##_name##_store)
|
|
|
|
static ssize_t dm_attr_store(struct kobject *kobj, struct attribute *attr,
|
|
const char *page, size_t count)
|
|
{
|
|
struct dm_sysfs_attr *dm_attr;
|
|
struct mapped_device *md;
|
|
ssize_t ret;
|
|
|
|
dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
|
|
if (!dm_attr->store)
|
|
return -EIO;
|
|
|
|
md = dm_get_from_kobject(kobj);
|
|
if (!md)
|
|
return -EINVAL;
|
|
|
|
ret = dm_attr->store(md, page, count);
|
|
dm_put(md);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf)
|
|
{
|
|
if (dm_copy_name_and_uuid(md, buf, NULL))
|
|
return -EIO;
|
|
|
|
strcat(buf, "\n");
|
|
return strlen(buf);
|
|
}
|
|
|
|
static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf)
|
|
{
|
|
if (dm_copy_name_and_uuid(md, NULL, buf))
|
|
return -EIO;
|
|
|
|
strcat(buf, "\n");
|
|
return strlen(buf);
|
|
}
|
|
|
|
static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
|
|
{
|
|
sprintf(buf, "%d\n", dm_suspended_md(md));
|
|
|
|
return strlen(buf);
|
|
}
|
|
|
|
static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf)
|
|
{
|
|
sprintf(buf, "%d\n", dm_use_blk_mq(md));
|
|
|
|
return strlen(buf);
|
|
}
|
|
|
|
static DM_ATTR_RO(name);
|
|
static DM_ATTR_RO(uuid);
|
|
static DM_ATTR_RO(suspended);
|
|
static DM_ATTR_RO(use_blk_mq);
|
|
static DM_ATTR_RW(rq_based_seq_io_merge_deadline);
|
|
|
|
static struct attribute *dm_attrs[] = {
|
|
&dm_attr_name.attr,
|
|
&dm_attr_uuid.attr,
|
|
&dm_attr_suspended.attr,
|
|
&dm_attr_use_blk_mq.attr,
|
|
&dm_attr_rq_based_seq_io_merge_deadline.attr,
|
|
NULL,
|
|
};
|
|
|
|
static const struct sysfs_ops dm_sysfs_ops = {
|
|
.show = dm_attr_show,
|
|
.store = dm_attr_store,
|
|
};
|
|
|
|
static struct kobj_type dm_ktype = {
|
|
.sysfs_ops = &dm_sysfs_ops,
|
|
.default_attrs = dm_attrs,
|
|
.release = dm_kobject_release,
|
|
};
|
|
|
|
/*
|
|
* Initialize kobj
|
|
* because nobody using md yet, no need to call explicit dm_get/put
|
|
*/
|
|
int dm_sysfs_init(struct mapped_device *md)
|
|
{
|
|
return kobject_init_and_add(dm_kobject(md), &dm_ktype,
|
|
&disk_to_dev(dm_disk(md))->kobj,
|
|
"%s", "dm");
|
|
}
|
|
|
|
/*
|
|
* Remove kobj, called after all references removed
|
|
*/
|
|
void dm_sysfs_exit(struct mapped_device *md)
|
|
{
|
|
struct kobject *kobj = dm_kobject(md);
|
|
kobject_put(kobj);
|
|
wait_for_completion(dm_get_completion_from_kobject(kobj));
|
|
}
|