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Linux/fs/exofs/sys.c

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  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 
 27 struct 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 
 33 static 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 
 42 static 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 
 51 static const struct sysfs_ops odev_attr_ops = {
 52         .show  = odev_attr_show,
 53         .store = odev_attr_store,
 54 };
 55 
 56 
 57 static struct kset *exofs_kset;
 58 
 59 static 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 
 67 static 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 
 76 static ssize_t uri_show(struct exofs_dev *edp, char *buf)
 77 {
 78         return snprintf(buf, edp->urilen, "%s", edp->uri);
 79 }
 80 
 81 static 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 
 98 OSD_ATTR(osdname, S_IRUGO, osdname_show, NULL);
 99 OSD_ATTR(systemid, S_IRUGO, systemid_show, NULL);
100 OSD_ATTR(uri, S_IRWXU, uri_show, uri_store);
101 
102 static struct attribute *odev_attrs[] = {
103         &odev_attr_osdname.attr,
104         &odev_attr_systemid.attr,
105         &odev_attr_uri.attr,
106         NULL,
107 };
108 
109 static struct kobj_type odev_ktype = {
110         .default_attrs  = odev_attrs,
111         .sysfs_ops      = &odev_attr_ops,
112 };
113 
114 static struct kobj_type uuid_ktype = {
115 };
116 
117 void 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)kref_read(&k_name->kref));
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  */
134 void 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  */
152 int 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 
172 int 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 
192 int 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 
202 void exofs_sysfs_uninit(void)
203 {
204         kset_unregister(exofs_kset);
205 }
206 

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