1/*
2 * Copyright (C) 2012
3 * Sachin Bhamare <sbhamare@panasas.com>
4 * Boaz Harrosh <ooo@electrozaur.com>
5 *
6 * This file is part of exofs.
7 *
8 * exofs is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License 2 as published by
10 * the Free Software Foundation.
11 *
12 * exofs is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with exofs; if not, write to the:
19 *	Free Software Foundation <licensing@fsf.org>
20 */
21
22#include <linux/kobject.h>
23#include <linux/device.h>
24
25#include "exofs.h"
26
27struct odev_attr {
28	struct attribute attr;
29	ssize_t (*show)(struct exofs_dev *, char *);
30	ssize_t (*store)(struct exofs_dev *, const char *, size_t);
31};
32
33static ssize_t odev_attr_show(struct kobject *kobj, struct attribute *attr,
34		char *buf)
35{
36	struct exofs_dev *edp = container_of(kobj, struct exofs_dev, ed_kobj);
37	struct odev_attr *a = container_of(attr, struct odev_attr, attr);
38
39	return a->show ? a->show(edp, buf) : 0;
40}
41
42static ssize_t odev_attr_store(struct kobject *kobj, struct attribute *attr,
43		const char *buf, size_t len)
44{
45	struct exofs_dev *edp = container_of(kobj, struct exofs_dev, ed_kobj);
46	struct odev_attr *a = container_of(attr, struct odev_attr, attr);
47
48	return a->store ? a->store(edp, buf, len) : len;
49}
50
51static const struct sysfs_ops odev_attr_ops = {
52	.show  = odev_attr_show,
53	.store = odev_attr_store,
54};
55
56
57static struct kset *exofs_kset;
58
59static ssize_t osdname_show(struct exofs_dev *edp, char *buf)
60{
61	struct osd_dev *odev = edp->ored.od;
62	const struct osd_dev_info *odi = osduld_device_info(odev);
63
64	return snprintf(buf, odi->osdname_len + 1, "%s", odi->osdname);
65}
66
67static ssize_t systemid_show(struct exofs_dev *edp, char *buf)
68{
69	struct osd_dev *odev = edp->ored.od;
70	const struct osd_dev_info *odi = osduld_device_info(odev);
71
72	memcpy(buf, odi->systemid, odi->systemid_len);
73	return odi->systemid_len;
74}
75
76static ssize_t uri_show(struct exofs_dev *edp, char *buf)
77{
78	return snprintf(buf, edp->urilen, "%s", edp->uri);
79}
80
81static ssize_t uri_store(struct exofs_dev *edp, const char *buf, size_t len)
82{
83	uint8_t *new_uri;
84
85	edp->urilen = strlen(buf) + 1;
86	new_uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL);
87	if (new_uri == NULL)
88		return -ENOMEM;
89	edp->uri = new_uri;
90	strncpy(edp->uri, buf, edp->urilen);
91	return edp->urilen;
92}
93
94#define OSD_ATTR(name, mode, show, store) \
95	static struct odev_attr odev_attr_##name = \
96					__ATTR(name, mode, show, store)
97
98OSD_ATTR(osdname, S_IRUGO, osdname_show, NULL);
99OSD_ATTR(systemid, S_IRUGO, systemid_show, NULL);
100OSD_ATTR(uri, S_IRWXU, uri_show, uri_store);
101
102static struct attribute *odev_attrs[] = {
103	&odev_attr_osdname.attr,
104	&odev_attr_systemid.attr,
105	&odev_attr_uri.attr,
106	NULL,
107};
108
109static struct kobj_type odev_ktype = {
110	.default_attrs	= odev_attrs,
111	.sysfs_ops	= &odev_attr_ops,
112};
113
114static struct kobj_type uuid_ktype = {
115};
116
117void exofs_sysfs_dbg_print(void)
118{
119#ifdef CONFIG_EXOFS_DEBUG
120	struct kobject *k_name, *k_tmp;
121
122	list_for_each_entry_safe(k_name, k_tmp, &exofs_kset->list, entry) {
123		printk(KERN_INFO "%s: name %s ref %d\n",
124			__func__, kobject_name(k_name),
125			(int)atomic_read(&k_name->kref.refcount));
126	}
127#endif
128}
129/*
130 * This function removes all kobjects under exofs_kset
131 * At the end of it, exofs_kset kobject will have a refcount
132 * of 1 which gets decremented only on exofs module unload
133 */
134void exofs_sysfs_sb_del(struct exofs_sb_info *sbi)
135{
136	struct kobject *k_name, *k_tmp;
137	struct kobject *s_kobj = &sbi->s_kobj;
138
139	list_for_each_entry_safe(k_name, k_tmp, &exofs_kset->list, entry) {
140		/* Remove all that are children of this SBI */
141		if (k_name->parent == s_kobj)
142			kobject_put(k_name);
143	}
144	kobject_put(s_kobj);
145}
146
147/*
148 * This function creates sysfs entries to hold the current exofs cluster
149 * instance (uniquely identified by osdname,pid tuple).
150 * This function gets called once per exofs mount instance.
151 */
152int exofs_sysfs_sb_add(struct exofs_sb_info *sbi,
153		       struct exofs_dt_device_info *dt_dev)
154{
155	struct kobject *s_kobj;
156	int retval = 0;
157	uint64_t pid = sbi->one_comp.obj.partition;
158
159	/* allocate new uuid dirent */
160	s_kobj = &sbi->s_kobj;
161	s_kobj->kset = exofs_kset;
162	retval = kobject_init_and_add(s_kobj, &uuid_ktype,
163			&exofs_kset->kobj,  "%s_%llx", dt_dev->osdname, pid);
164	if (retval) {
165		EXOFS_ERR("ERROR: Failed to create sysfs entry for "
166			  "uuid-%s_%llx => %d\n", dt_dev->osdname, pid, retval);
167		return -ENOMEM;
168	}
169	return 0;
170}
171
172int exofs_sysfs_odev_add(struct exofs_dev *edev, struct exofs_sb_info *sbi)
173{
174	struct kobject *d_kobj;
175	int retval = 0;
176
177	/* create osd device group which contains following attributes
178	 * osdname, systemid & uri
179	 */
180	d_kobj = &edev->ed_kobj;
181	d_kobj->kset = exofs_kset;
182	retval = kobject_init_and_add(d_kobj, &odev_ktype,
183			&sbi->s_kobj, "dev%u", edev->did);
184	if (retval) {
185		EXOFS_ERR("ERROR: Failed to create sysfs entry for "
186				"device dev%u\n", edev->did);
187		return retval;
188	}
189	return 0;
190}
191
192int exofs_sysfs_init(void)
193{
194	exofs_kset = kset_create_and_add("exofs", NULL, fs_kobj);
195	if (!exofs_kset) {
196		EXOFS_ERR("ERROR: kset_create_and_add exofs failed\n");
197		return -ENOMEM;
198	}
199	return 0;
200}
201
202void exofs_sysfs_uninit(void)
203{
204	kset_unregister(exofs_kset);
205}
206