fs/gfs2/locking/dlm/sysfs.c

   1 /*
   2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
   3  * Copyright (C) 2004-2005 Red Hat, Inc.  All rights reserved.
   4  *
   5  * This copyrighted material is made available to anyone wishing to use,
   6  * modify, copy, or redistribute it subject to the terms and conditions
   7  * of the GNU General Public License version 2.
   8  */
   9
  10 #include <linux/ctype.h>
  11 #include <linux/stat.h>
  12
  13 #include "lock_dlm.h"
  14
  15 extern struct lm_lockops gdlm_ops;
  16
  17 static ssize_t proto_name_show(struct gdlm_ls *ls, char *buf)
  18 {
  19         return sprintf(buf, "%s\n", gdlm_ops.lm_proto_name);
  20 }
  21
  22 static ssize_t block_show(struct gdlm_ls *ls, char *buf)
  23 {
  24         ssize_t ret;
  25         int val = 0;
  26
  27         if (test_bit(DFL_BLOCK_LOCKS, &ls->flags))
  28                 val = 1;
  29         ret = sprintf(buf, "%d\n", val);
  30         return ret;
  31 }
  32
  33 static ssize_t block_store(struct gdlm_ls *ls, const char *buf, size_t len)
  34 {
  35         ssize_t ret = len;
  36         int val;
  37
  38         val = simple_strtol(buf, NULL, 0);
  39
  40         if (val == 1)
  41                 set_bit(DFL_BLOCK_LOCKS, &ls->flags);
  42         else if (val == 0) {
  43                 clear_bit(DFL_BLOCK_LOCKS, &ls->flags);
  44                 gdlm_submit_delayed(ls);
  45         } else
  46                 ret = -EINVAL;
  47         return ret;
  48 }
  49
  50 static ssize_t withdraw_show(struct gdlm_ls *ls, char *buf)
  51 {
  52         ssize_t ret;
  53         int val = 0;
  54
  55         if (test_bit(DFL_WITHDRAW, &ls->flags))
  56                 val = 1;
  57         ret = sprintf(buf, "%d\n", val);
  58         return ret;
  59 }
  60
  61 static ssize_t withdraw_store(struct gdlm_ls *ls, const char *buf, size_t len)
  62 {
  63         ssize_t ret = len;
  64         int val;
  65
  66         val = simple_strtol(buf, NULL, 0);
  67
  68         if (val == 1)
  69                 set_bit(DFL_WITHDRAW, &ls->flags);
  70         else
  71                 ret = -EINVAL;
  72         wake_up(&ls->wait_control);
  73         return ret;
  74 }
  75
  76 static ssize_t id_show(struct gdlm_ls *ls, char *buf)
  77 {
  78         return sprintf(buf, "%u\n", ls->id);
  79 }
  80
  81 static ssize_t jid_show(struct gdlm_ls *ls, char *buf)
  82 {
  83         return sprintf(buf, "%d\n", ls->jid);
  84 }
  85
  86 static ssize_t first_show(struct gdlm_ls *ls, char *buf)
  87 {
  88         return sprintf(buf, "%d\n", ls->first);
  89 }
  90
  91 static ssize_t first_done_show(struct gdlm_ls *ls, char *buf)
  92 {
  93         return sprintf(buf, "%d\n", ls->first_done);
  94 }
  95
  96 static ssize_t recover_show(struct gdlm_ls *ls, char *buf)
  97 {
  98         return sprintf(buf, "%d\n", ls->recover_jid);
  99 }
 100
 101 static ssize_t recover_store(struct gdlm_ls *ls, const char *buf, size_t len)
 102 {
 103         ls->recover_jid = simple_strtol(buf, NULL, 0);
 104         ls->fscb(ls->fsdata, LM_CB_NEED_RECOVERY, &ls->recover_jid);
 105         return len;
 106 }
 107
 108 static ssize_t recover_done_show(struct gdlm_ls *ls, char *buf)
 109 {
 110         return sprintf(buf, "%d\n", ls->recover_jid_done);
 111 }
 112
 113 static ssize_t recover_status_show(struct gdlm_ls *ls, char *buf)
 114 {
 115         return sprintf(buf, "%d\n", ls->recover_jid_status);
 116 }
 117
 118 struct gdlm_attr {
 119         struct attribute attr;
 120         ssize_t (*show)(struct gdlm_ls *, char *);
 121         ssize_t (*store)(struct gdlm_ls *, const char *, size_t);
 122 };
 123
 124 #define GDLM_ATTR(_name,_mode,_show,_store) \
 125 static struct gdlm_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 126
 127 GDLM_ATTR(proto_name,     0444, proto_name_show,     NULL);
 128 GDLM_ATTR(block,          0644, block_show,          block_store);
 129 GDLM_ATTR(withdraw,       0644, withdraw_show,       withdraw_store);
 130 GDLM_ATTR(id,             0444, id_show,             NULL);
 131 GDLM_ATTR(jid,            0444, jid_show,            NULL);
 132 GDLM_ATTR(first,          0444, first_show,          NULL);
 133 GDLM_ATTR(first_done,     0444, first_done_show,     NULL);
 134 GDLM_ATTR(recover,        0644, recover_show,        recover_store);
 135 GDLM_ATTR(recover_done,   0444, recover_done_show,   NULL);
 136 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
 137
 138 static struct attribute *gdlm_attrs[] = {
 139         &gdlm_attr_proto_name.attr,
 140         &gdlm_attr_block.attr,
 141         &gdlm_attr_withdraw.attr,
 142         &gdlm_attr_id.attr,
 143         &gdlm_attr_jid.attr,
 144         &gdlm_attr_first.attr,
 145         &gdlm_attr_first_done.attr,
 146         &gdlm_attr_recover.attr,
 147         &gdlm_attr_recover_done.attr,
 148         &gdlm_attr_recover_status.attr,
 149         NULL,
 150 };
 151
 152 static ssize_t gdlm_attr_show(struct kobject *kobj, struct attribute *attr,
 153                               char *buf)
 154 {
 155         struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
 156         struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
 157         return a->show ? a->show(ls, buf) : 0;
 158 }
 159
 160 static ssize_t gdlm_attr_store(struct kobject *kobj, struct attribute *attr,
 161                                const char *buf, size_t len)
 162 {
 163         struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
 164         struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
 165         return a->store ? a->store(ls, buf, len) : len;
 166 }
 167
 168 static struct sysfs_ops gdlm_attr_ops = {
 169         .show  = gdlm_attr_show,
 170         .store = gdlm_attr_store,
 171 };
 172
 173 static struct kobj_type gdlm_ktype = {
 174         .default_attrs = gdlm_attrs,
 175         .sysfs_ops     = &gdlm_attr_ops,
 176 };
 177
 178 static struct kset gdlm_kset = {
 179         .subsys = &kernel_subsys,
 180         .kobj   = {.name = "lock_dlm",},
 181         .ktype  = &gdlm_ktype,
 182 };
 183
 184 int gdlm_kobject_setup(struct gdlm_ls *ls, struct kobject *fskobj)
 185 {
 186         int error;
 187
 188         error = kobject_set_name(&ls->kobj, "%s", "lock_module");
 189         if (error) {
 190                 log_error("can't set kobj name %d", error);
 191                 return error;
 192         }
 193
 194         ls->kobj.kset = &gdlm_kset;
 195         ls->kobj.ktype = &gdlm_ktype;
 196         ls->kobj.parent = fskobj;
 197
 198         error = kobject_register(&ls->kobj);
 199         if (error)
 200                 log_error("can't register kobj %d", error);
 201
 202         return error;
 203 }
 204
 205 void gdlm_kobject_release(struct gdlm_ls *ls)
 206 {
 207         kobject_unregister(&ls->kobj);
 208 }
 209
 210 int gdlm_sysfs_init(void)
 211 {
 212         int error;
 213
 214         error = kset_register(&gdlm_kset);
 215         if (error)
 216                 printk("lock_dlm: cannot register kset %d\n", error);
 217
 218         return error;
 219 }
 220
 221 void gdlm_sysfs_exit(void)
 222 {
 223         kset_unregister(&gdlm_kset);
 224 }
 225