Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * Copyright (C) 2012
3 * Sachin Bhamare <sbhamare@panasas.com>
4 * Boaz Harrosh <bharrosh@panasas.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 edp->urilen = strlen(buf) + 1;
84 edp->uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL);
85 strncpy(edp->uri, buf, edp->urilen);
86 return edp->urilen;
87}
88
89#define OSD_ATTR(name, mode, show, store) \
90 static struct odev_attr odev_attr_##name = \
91 __ATTR(name, mode, show, store)
92
93OSD_ATTR(osdname, S_IRUGO, osdname_show, NULL);
94OSD_ATTR(systemid, S_IRUGO, systemid_show, NULL);
95OSD_ATTR(uri, S_IRWXU, uri_show, uri_store);
96
97static struct attribute *odev_attrs[] = {
98 &odev_attr_osdname.attr,
99 &odev_attr_systemid.attr,
100 &odev_attr_uri.attr,
101 NULL,
102};
103
104static struct kobj_type odev_ktype = {
105 .default_attrs = odev_attrs,
106 .sysfs_ops = &odev_attr_ops,
107};
108
109static struct kobj_type uuid_ktype = {
110};
111
112void exofs_sysfs_dbg_print(void)
113{
114#ifdef CONFIG_EXOFS_DEBUG
115 struct kobject *k_name, *k_tmp;
116
117 list_for_each_entry_safe(k_name, k_tmp, &exofs_kset->list, entry) {
118 printk(KERN_INFO "%s: name %s ref %d\n",
119 __func__, kobject_name(k_name),
120 (int)atomic_read(&k_name->kref.refcount));
121 }
122#endif
123}
124/*
125 * This function removes all kobjects under exofs_kset
126 * At the end of it, exofs_kset kobject will have a refcount
127 * of 1 which gets decremented only on exofs module unload
128 */
129void exofs_sysfs_sb_del(struct exofs_sb_info *sbi)
130{
131 struct kobject *k_name, *k_tmp;
132 struct kobject *s_kobj = &sbi->s_kobj;
133
134 list_for_each_entry_safe(k_name, k_tmp, &exofs_kset->list, entry) {
135 /* Remove all that are children of this SBI */
136 if (k_name->parent == s_kobj)
137 kobject_put(k_name);
138 }
139 kobject_put(s_kobj);
140}
141
142/*
143 * This function creates sysfs entries to hold the current exofs cluster
144 * instance (uniquely identified by osdname,pid tuple).
145 * This function gets called once per exofs mount instance.
146 */
147int exofs_sysfs_sb_add(struct exofs_sb_info *sbi,
148 struct exofs_dt_device_info *dt_dev)
149{
150 struct kobject *s_kobj;
151 int retval = 0;
152 uint64_t pid = sbi->one_comp.obj.partition;
153
154 /* allocate new uuid dirent */
155 s_kobj = &sbi->s_kobj;
156 s_kobj->kset = exofs_kset;
157 retval = kobject_init_and_add(s_kobj, &uuid_ktype,
158 &exofs_kset->kobj, "%s_%llx", dt_dev->osdname, pid);
159 if (retval) {
160 EXOFS_ERR("ERROR: Failed to create sysfs entry for "
161 "uuid-%s_%llx => %d\n", dt_dev->osdname, pid, retval);
162 return -ENOMEM;
163 }
164 return 0;
165}
166
167int exofs_sysfs_odev_add(struct exofs_dev *edev, struct exofs_sb_info *sbi)
168{
169 struct kobject *d_kobj;
170 int retval = 0;
171
172 /* create osd device group which contains following attributes
173 * osdname, systemid & uri
174 */
175 d_kobj = &edev->ed_kobj;
176 d_kobj->kset = exofs_kset;
177 retval = kobject_init_and_add(d_kobj, &odev_ktype,
178 &sbi->s_kobj, "dev%u", edev->did);
179 if (retval) {
180 EXOFS_ERR("ERROR: Failed to create sysfs entry for "
181 "device dev%u\n", edev->did);
182 return retval;
183 }
184 return 0;
185}
186
187int exofs_sysfs_init(void)
188{
189 exofs_kset = kset_create_and_add("exofs", NULL, fs_kobj);
190 if (!exofs_kset) {
191 EXOFS_ERR("ERROR: kset_create_and_add exofs failed\n");
192 return -ENOMEM;
193 }
194 return 0;
195}
196
197void exofs_sysfs_uninit(void)
198{
199 kset_unregister(exofs_kset);
200}