fs/exofs/sys.c

   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)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  */
 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 }