3 * Sachin Bhamare <sbhamare@panasas.com>
4 * Boaz Harrosh <bharrosh@panasas.com>
6 * This file is part of exofs.
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.
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.
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>
22 #include <linux/kobject.h>
23 #include <linux/device.h>
28 struct attribute attr;
29 ssize_t (*show)(struct exofs_dev *, char *);
30 ssize_t (*store)(struct exofs_dev *, const char *, size_t);
33 static ssize_t odev_attr_show(struct kobject *kobj, struct attribute *attr,
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);
39 return a->show ? a->show(edp, buf) : 0;
42 static ssize_t odev_attr_store(struct kobject *kobj, struct attribute *attr,
43 const char *buf, size_t len)
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);
48 return a->store ? a->store(edp, buf, len) : len;
51 static const struct sysfs_ops odev_attr_ops = {
52 .show = odev_attr_show,
53 .store = odev_attr_store,
57 static struct kset *exofs_kset;
59 static ssize_t osdname_show(struct exofs_dev *edp, char *buf)
61 struct osd_dev *odev = edp->ored.od;
62 const struct osd_dev_info *odi = osduld_device_info(odev);
64 return snprintf(buf, odi->osdname_len + 1, "%s", odi->osdname);
67 static ssize_t systemid_show(struct exofs_dev *edp, char *buf)
69 struct osd_dev *odev = edp->ored.od;
70 const struct osd_dev_info *odi = osduld_device_info(odev);
72 memcpy(buf, odi->systemid, odi->systemid_len);
73 return odi->systemid_len;
76 static ssize_t uri_show(struct exofs_dev *edp, char *buf)
78 return snprintf(buf, edp->urilen, "%s", edp->uri);
81 static ssize_t uri_store(struct exofs_dev *edp, const char *buf, size_t len)
83 edp->urilen = strlen(buf) + 1;
84 edp->uri = krealloc(edp->uri, edp->urilen, GFP_KERNEL);
85 strncpy(edp->uri, buf, edp->urilen);
89 #define OSD_ATTR(name, mode, show, store) \
90 static struct odev_attr odev_attr_##name = \
91 __ATTR(name, mode, show, store)
93 OSD_ATTR(osdname, S_IRUGO, osdname_show, NULL);
94 OSD_ATTR(systemid, S_IRUGO, systemid_show, NULL);
95 OSD_ATTR(uri, S_IRWXU, uri_show, uri_store);
97 static struct attribute *odev_attrs[] = {
98 &odev_attr_osdname.attr,
99 &odev_attr_systemid.attr,
104 static struct kobj_type odev_ktype = {
105 .default_attrs = odev_attrs,
106 .sysfs_ops = &odev_attr_ops,
109 static struct kobj_type uuid_ktype = {
112 void exofs_sysfs_dbg_print(void)
114 #ifdef CONFIG_EXOFS_DEBUG
115 struct kobject *k_name, *k_tmp;
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));
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
129 void exofs_sysfs_sb_del(struct exofs_sb_info *sbi)
131 struct kobject *k_name, *k_tmp;
132 struct kobject *s_kobj = &sbi->s_kobj;
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)
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.
147 int exofs_sysfs_sb_add(struct exofs_sb_info *sbi,
148 struct exofs_dt_device_info *dt_dev)
150 struct kobject *s_kobj;
152 uint64_t pid = sbi->one_comp.obj.partition;
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);
160 EXOFS_ERR("ERROR: Failed to create sysfs entry for "
161 "uuid-%s_%llx => %d\n", dt_dev->osdname, pid, retval);
167 int exofs_sysfs_odev_add(struct exofs_dev *edev, struct exofs_sb_info *sbi)
169 struct kobject *d_kobj;
172 /* create osd device group which contains following attributes
173 * osdname, systemid & uri
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);
180 EXOFS_ERR("ERROR: Failed to create sysfs entry for "
181 "device dev%u\n", edev->did);
187 int exofs_sysfs_init(void)
189 exofs_kset = kset_create_and_add("exofs", NULL, fs_kobj);
191 EXOFS_ERR("ERROR: kset_create_and_add exofs failed\n");
197 void exofs_sysfs_uninit(void)
199 kset_unregister(exofs_kset);