1*4882a593Smuzhiyun /*
2*4882a593Smuzhiyun * Copyright (C) 2008 Red Hat, Inc. All rights reserved.
3*4882a593Smuzhiyun *
4*4882a593Smuzhiyun * This file is released under the GPL.
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #include <linux/sysfs.h>
8*4882a593Smuzhiyun #include <linux/dm-ioctl.h>
9*4882a593Smuzhiyun #include "dm-core.h"
10*4882a593Smuzhiyun #include "dm-rq.h"
11*4882a593Smuzhiyun
12*4882a593Smuzhiyun struct dm_sysfs_attr {
13*4882a593Smuzhiyun struct attribute attr;
14*4882a593Smuzhiyun ssize_t (*show)(struct mapped_device *, char *);
15*4882a593Smuzhiyun ssize_t (*store)(struct mapped_device *, const char *, size_t count);
16*4882a593Smuzhiyun };
17*4882a593Smuzhiyun
18*4882a593Smuzhiyun #define DM_ATTR_RO(_name) \
19*4882a593Smuzhiyun struct dm_sysfs_attr dm_attr_##_name = \
20*4882a593Smuzhiyun __ATTR(_name, S_IRUGO, dm_attr_##_name##_show, NULL)
21*4882a593Smuzhiyun
dm_attr_show(struct kobject * kobj,struct attribute * attr,char * page)22*4882a593Smuzhiyun static ssize_t dm_attr_show(struct kobject *kobj, struct attribute *attr,
23*4882a593Smuzhiyun char *page)
24*4882a593Smuzhiyun {
25*4882a593Smuzhiyun struct dm_sysfs_attr *dm_attr;
26*4882a593Smuzhiyun struct mapped_device *md;
27*4882a593Smuzhiyun ssize_t ret;
28*4882a593Smuzhiyun
29*4882a593Smuzhiyun dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
30*4882a593Smuzhiyun if (!dm_attr->show)
31*4882a593Smuzhiyun return -EIO;
32*4882a593Smuzhiyun
33*4882a593Smuzhiyun md = dm_get_from_kobject(kobj);
34*4882a593Smuzhiyun if (!md)
35*4882a593Smuzhiyun return -EINVAL;
36*4882a593Smuzhiyun
37*4882a593Smuzhiyun ret = dm_attr->show(md, page);
38*4882a593Smuzhiyun dm_put(md);
39*4882a593Smuzhiyun
40*4882a593Smuzhiyun return ret;
41*4882a593Smuzhiyun }
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun #define DM_ATTR_RW(_name) \
44*4882a593Smuzhiyun struct dm_sysfs_attr dm_attr_##_name = \
45*4882a593Smuzhiyun __ATTR(_name, S_IRUGO | S_IWUSR, dm_attr_##_name##_show, dm_attr_##_name##_store)
46*4882a593Smuzhiyun
dm_attr_store(struct kobject * kobj,struct attribute * attr,const char * page,size_t count)47*4882a593Smuzhiyun static ssize_t dm_attr_store(struct kobject *kobj, struct attribute *attr,
48*4882a593Smuzhiyun const char *page, size_t count)
49*4882a593Smuzhiyun {
50*4882a593Smuzhiyun struct dm_sysfs_attr *dm_attr;
51*4882a593Smuzhiyun struct mapped_device *md;
52*4882a593Smuzhiyun ssize_t ret;
53*4882a593Smuzhiyun
54*4882a593Smuzhiyun dm_attr = container_of(attr, struct dm_sysfs_attr, attr);
55*4882a593Smuzhiyun if (!dm_attr->store)
56*4882a593Smuzhiyun return -EIO;
57*4882a593Smuzhiyun
58*4882a593Smuzhiyun md = dm_get_from_kobject(kobj);
59*4882a593Smuzhiyun if (!md)
60*4882a593Smuzhiyun return -EINVAL;
61*4882a593Smuzhiyun
62*4882a593Smuzhiyun ret = dm_attr->store(md, page, count);
63*4882a593Smuzhiyun dm_put(md);
64*4882a593Smuzhiyun
65*4882a593Smuzhiyun return ret;
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
dm_attr_name_show(struct mapped_device * md,char * buf)68*4882a593Smuzhiyun static ssize_t dm_attr_name_show(struct mapped_device *md, char *buf)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun if (dm_copy_name_and_uuid(md, buf, NULL))
71*4882a593Smuzhiyun return -EIO;
72*4882a593Smuzhiyun
73*4882a593Smuzhiyun strcat(buf, "\n");
74*4882a593Smuzhiyun return strlen(buf);
75*4882a593Smuzhiyun }
76*4882a593Smuzhiyun
dm_attr_uuid_show(struct mapped_device * md,char * buf)77*4882a593Smuzhiyun static ssize_t dm_attr_uuid_show(struct mapped_device *md, char *buf)
78*4882a593Smuzhiyun {
79*4882a593Smuzhiyun if (dm_copy_name_and_uuid(md, NULL, buf))
80*4882a593Smuzhiyun return -EIO;
81*4882a593Smuzhiyun
82*4882a593Smuzhiyun strcat(buf, "\n");
83*4882a593Smuzhiyun return strlen(buf);
84*4882a593Smuzhiyun }
85*4882a593Smuzhiyun
dm_attr_suspended_show(struct mapped_device * md,char * buf)86*4882a593Smuzhiyun static ssize_t dm_attr_suspended_show(struct mapped_device *md, char *buf)
87*4882a593Smuzhiyun {
88*4882a593Smuzhiyun sprintf(buf, "%d\n", dm_suspended_md(md));
89*4882a593Smuzhiyun
90*4882a593Smuzhiyun return strlen(buf);
91*4882a593Smuzhiyun }
92*4882a593Smuzhiyun
dm_attr_use_blk_mq_show(struct mapped_device * md,char * buf)93*4882a593Smuzhiyun static ssize_t dm_attr_use_blk_mq_show(struct mapped_device *md, char *buf)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun /* Purely for userspace compatibility */
96*4882a593Smuzhiyun sprintf(buf, "%d\n", true);
97*4882a593Smuzhiyun
98*4882a593Smuzhiyun return strlen(buf);
99*4882a593Smuzhiyun }
100*4882a593Smuzhiyun
101*4882a593Smuzhiyun static DM_ATTR_RO(name);
102*4882a593Smuzhiyun static DM_ATTR_RO(uuid);
103*4882a593Smuzhiyun static DM_ATTR_RO(suspended);
104*4882a593Smuzhiyun static DM_ATTR_RO(use_blk_mq);
105*4882a593Smuzhiyun static DM_ATTR_RW(rq_based_seq_io_merge_deadline);
106*4882a593Smuzhiyun
107*4882a593Smuzhiyun static struct attribute *dm_attrs[] = {
108*4882a593Smuzhiyun &dm_attr_name.attr,
109*4882a593Smuzhiyun &dm_attr_uuid.attr,
110*4882a593Smuzhiyun &dm_attr_suspended.attr,
111*4882a593Smuzhiyun &dm_attr_use_blk_mq.attr,
112*4882a593Smuzhiyun &dm_attr_rq_based_seq_io_merge_deadline.attr,
113*4882a593Smuzhiyun NULL,
114*4882a593Smuzhiyun };
115*4882a593Smuzhiyun
116*4882a593Smuzhiyun static const struct sysfs_ops dm_sysfs_ops = {
117*4882a593Smuzhiyun .show = dm_attr_show,
118*4882a593Smuzhiyun .store = dm_attr_store,
119*4882a593Smuzhiyun };
120*4882a593Smuzhiyun
121*4882a593Smuzhiyun static struct kobj_type dm_ktype = {
122*4882a593Smuzhiyun .sysfs_ops = &dm_sysfs_ops,
123*4882a593Smuzhiyun .default_attrs = dm_attrs,
124*4882a593Smuzhiyun .release = dm_kobject_release,
125*4882a593Smuzhiyun };
126*4882a593Smuzhiyun
127*4882a593Smuzhiyun /*
128*4882a593Smuzhiyun * Initialize kobj
129*4882a593Smuzhiyun * because nobody using md yet, no need to call explicit dm_get/put
130*4882a593Smuzhiyun */
dm_sysfs_init(struct mapped_device * md)131*4882a593Smuzhiyun int dm_sysfs_init(struct mapped_device *md)
132*4882a593Smuzhiyun {
133*4882a593Smuzhiyun return kobject_init_and_add(dm_kobject(md), &dm_ktype,
134*4882a593Smuzhiyun &disk_to_dev(dm_disk(md))->kobj,
135*4882a593Smuzhiyun "%s", "dm");
136*4882a593Smuzhiyun }
137*4882a593Smuzhiyun
138*4882a593Smuzhiyun /*
139*4882a593Smuzhiyun * Remove kobj, called after all references removed
140*4882a593Smuzhiyun */
dm_sysfs_exit(struct mapped_device * md)141*4882a593Smuzhiyun void dm_sysfs_exit(struct mapped_device *md)
142*4882a593Smuzhiyun {
143*4882a593Smuzhiyun struct kobject *kobj = dm_kobject(md);
144*4882a593Smuzhiyun kobject_put(kobj);
145*4882a593Smuzhiyun wait_for_completion(dm_get_completion_from_kobject(kobj));
146*4882a593Smuzhiyun }
147