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         }
  48         return ret;
  49 }
  50
  51 static ssize_t withdraw_show(struct gdlm_ls *ls, char *buf)
  52 {
  53         ssize_t ret;
  54         int val = 0;
  55
  56         if (test_bit(DFL_WITHDRAW, &ls->flags))
  57                 val = 1;
  58         ret = sprintf(buf, "%d\n", val);
  59         return ret;
  60 }
  61
  62 static ssize_t withdraw_store(struct gdlm_ls *ls, const char *buf, size_t len)
  63 {
  64         ssize_t ret = len;
  65         int val;
  66
  67         val = simple_strtol(buf, NULL, 0);
  68
  69         if (val == 1)
  70                 set_bit(DFL_WITHDRAW, &ls->flags);
  71         else
  72                 ret = -EINVAL;
  73         wake_up(&ls->wait_control);
  74         return ret;
  75 }
  76
  77 static ssize_t id_show(struct gdlm_ls *ls, char *buf)
  78 {
  79         return sprintf(buf, "%u\n", ls->id);
  80 }
  81
  82 static ssize_t jid_show(struct gdlm_ls *ls, char *buf)
  83 {
  84         return sprintf(buf, "%d\n", ls->jid);
  85 }
  86
  87 static ssize_t first_show(struct gdlm_ls *ls, char *buf)
  88 {
  89         return sprintf(buf, "%d\n", ls->first);
  90 }
  91
  92 static ssize_t first_done_show(struct gdlm_ls *ls, char *buf)
  93 {
  94         return sprintf(buf, "%d\n", ls->first_done);
  95 }
  96
  97 static ssize_t recover_show(struct gdlm_ls *ls, char *buf)
  98 {
  99         return sprintf(buf, "%d\n", ls->recover_jid);
 100 }
 101
 102 static ssize_t recover_store(struct gdlm_ls *ls, const char *buf, size_t len)
 103 {
 104         ls->recover_jid = simple_strtol(buf, NULL, 0);
 105         ls->fscb(ls->sdp, LM_CB_NEED_RECOVERY, &ls->recover_jid);
 106         return len;
 107 }
 108
 109 static ssize_t recover_done_show(struct gdlm_ls *ls, char *buf)
 110 {
 111         return sprintf(buf, "%d\n", ls->recover_jid_done);
 112 }
 113
 114 static ssize_t recover_status_show(struct gdlm_ls *ls, char *buf)
 115 {
 116         return sprintf(buf, "%d\n", ls->recover_jid_status);
 117 }
 118
 119 static ssize_t drop_count_show(struct gdlm_ls *ls, char *buf)
 120 {
 121         return sprintf(buf, "%d\n", ls->drop_locks_count);
 122 }
 123
 124 static ssize_t drop_count_store(struct gdlm_ls *ls, const char *buf, size_t len)
 125 {
 126         ls->drop_locks_count = simple_strtol(buf, NULL, 0);
 127         return len;
 128 }
 129
 130 struct gdlm_attr {
 131         struct attribute attr;
 132         ssize_t (*show)(struct gdlm_ls *, char *);
 133         ssize_t (*store)(struct gdlm_ls *, const char *, size_t);
 134 };
 135
 136 #define GDLM_ATTR(_name,_mode,_show,_store) \
 137 static struct gdlm_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 138
 139 GDLM_ATTR(proto_name,     0444, proto_name_show,     NULL);
 140 GDLM_ATTR(block,          0644, block_show,          block_store);
 141 GDLM_ATTR(withdraw,       0644, withdraw_show,       withdraw_store);
 142 GDLM_ATTR(id,             0444, id_show,             NULL);
 143 GDLM_ATTR(jid,            0444, jid_show,            NULL);
 144 GDLM_ATTR(first,          0444, first_show,          NULL);
 145 GDLM_ATTR(first_done,     0444, first_done_show,     NULL);
 146 GDLM_ATTR(recover,        0644, recover_show,        recover_store);
 147 GDLM_ATTR(recover_done,   0444, recover_done_show,   NULL);
 148 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
 149 GDLM_ATTR(drop_count,     0644, drop_count_show,     drop_count_store);
 150
 151 static struct attribute *gdlm_attrs[] = {
 152         &gdlm_attr_proto_name.attr,
 153         &gdlm_attr_block.attr,
 154         &gdlm_attr_withdraw.attr,
 155         &gdlm_attr_id.attr,
 156         &gdlm_attr_jid.attr,
 157         &gdlm_attr_first.attr,
 158         &gdlm_attr_first_done.attr,
 159         &gdlm_attr_recover.attr,
 160         &gdlm_attr_recover_done.attr,
 161         &gdlm_attr_recover_status.attr,
 162         &gdlm_attr_drop_count.attr,
 163         NULL,
 164 };
 165
 166 static ssize_t gdlm_attr_show(struct kobject *kobj, struct attribute *attr,
 167                               char *buf)
 168 {
 169         struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
 170         struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
 171         return a->show ? a->show(ls, buf) : 0;
 172 }
 173
 174 static ssize_t gdlm_attr_store(struct kobject *kobj, struct attribute *attr,
 175                                const char *buf, size_t len)
 176 {
 177         struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
 178         struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
 179         return a->store ? a->store(ls, buf, len) : len;
 180 }
 181
 182 static struct sysfs_ops gdlm_attr_ops = {
 183         .show  = gdlm_attr_show,
 184         .store = gdlm_attr_store,
 185 };
 186
 187 static struct kobj_type gdlm_ktype = {
 188         .default_attrs = gdlm_attrs,
 189         .sysfs_ops     = &gdlm_attr_ops,
 190 };
 191
 192 static struct kset *gdlm_kset;
 193
 194 int gdlm_kobject_setup(struct gdlm_ls *ls, struct kobject *fskobj)
 195 {
 196         int error;
 197
 198         ls->kobj.kset = gdlm_kset;
 199         error = kobject_init_and_add(&ls->kobj, &gdlm_ktype, fskobj,
 200                                      "lock_module");
 201         if (error)
 202                 log_error("can't register kobj %d", error);
 203         kobject_uevent(&ls->kobj, KOBJ_ADD);
 204
 205         return error;
 206 }
 207
 208 void gdlm_kobject_release(struct gdlm_ls *ls)
 209 {
 210         kobject_put(&ls->kobj);
 211 }
 212
 213 int gdlm_sysfs_init(void)
 214 {
 215         gdlm_kset = kset_create_and_add("lock_dlm", NULL, kernel_kobj);
 216         if (!gdlm_kset) {
 217                 printk(KERN_WARNING "%s: can not create kset\n", __FUNCTION__);
 218                 return -ENOMEM;
 219         }
 220         return 0;
 221 }
 222
 223 void gdlm_sysfs_exit(void)
 224 {
 225         kset_unregister(gdlm_kset);
 226 }
 227