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 struct gdlm_attr {
 120         struct attribute attr;
 121         ssize_t (*show)(struct gdlm_ls *, char *);
 122         ssize_t (*store)(struct gdlm_ls *, const char *, size_t);
 123 };
 124
 125 #define GDLM_ATTR(_name,_mode,_show,_store) \
 126 static struct gdlm_attr gdlm_attr_##_name = __ATTR(_name,_mode,_show,_store)
 127
 128 GDLM_ATTR(proto_name,     0444, proto_name_show,     NULL);
 129 GDLM_ATTR(block,          0644, block_show,          block_store);
 130 GDLM_ATTR(withdraw,       0644, withdraw_show,       withdraw_store);
 131 GDLM_ATTR(id,             0444, id_show,             NULL);
 132 GDLM_ATTR(jid,            0444, jid_show,            NULL);
 133 GDLM_ATTR(first,          0444, first_show,          NULL);
 134 GDLM_ATTR(first_done,     0444, first_done_show,     NULL);
 135 GDLM_ATTR(recover,        0644, recover_show,        recover_store);
 136 GDLM_ATTR(recover_done,   0444, recover_done_show,   NULL);
 137 GDLM_ATTR(recover_status, 0444, recover_status_show, NULL);
 138
 139 static struct attribute *gdlm_attrs[] = {
 140         &gdlm_attr_proto_name.attr,
 141         &gdlm_attr_block.attr,
 142         &gdlm_attr_withdraw.attr,
 143         &gdlm_attr_id.attr,
 144         &gdlm_attr_jid.attr,
 145         &gdlm_attr_first.attr,
 146         &gdlm_attr_first_done.attr,
 147         &gdlm_attr_recover.attr,
 148         &gdlm_attr_recover_done.attr,
 149         &gdlm_attr_recover_status.attr,
 150         NULL,
 151 };
 152
 153 static ssize_t gdlm_attr_show(struct kobject *kobj, struct attribute *attr,
 154                               char *buf)
 155 {
 156         struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
 157         struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
 158         return a->show ? a->show(ls, buf) : 0;
 159 }
 160
 161 static ssize_t gdlm_attr_store(struct kobject *kobj, struct attribute *attr,
 162                                const char *buf, size_t len)
 163 {
 164         struct gdlm_ls *ls = container_of(kobj, struct gdlm_ls, kobj);
 165         struct gdlm_attr *a = container_of(attr, struct gdlm_attr, attr);
 166         return a->store ? a->store(ls, buf, len) : len;
 167 }
 168
 169 static struct sysfs_ops gdlm_attr_ops = {
 170         .show  = gdlm_attr_show,
 171         .store = gdlm_attr_store,
 172 };
 173
 174 static struct kobj_type gdlm_ktype = {
 175         .default_attrs = gdlm_attrs,
 176         .sysfs_ops     = &gdlm_attr_ops,
 177 };
 178
 179 static struct kset gdlm_kset = {
 180         .subsys = &kernel_subsys,
 181         .kobj   = {.name = "lock_dlm",},
 182         .ktype  = &gdlm_ktype,
 183 };
 184
 185 int gdlm_kobject_setup(struct gdlm_ls *ls, struct kobject *fskobj)
 186 {
 187         int error;
 188
 189         error = kobject_set_name(&ls->kobj, "%s", "lock_module");
 190         if (error) {
 191                 log_error("can't set kobj name %d", error);
 192                 return error;
 193         }
 194
 195         ls->kobj.kset = &gdlm_kset;
 196         ls->kobj.ktype = &gdlm_ktype;
 197         ls->kobj.parent = fskobj;
 198
 199         error = kobject_register(&ls->kobj);
 200         if (error)
 201                 log_error("can't register kobj %d", error);
 202
 203         return error;
 204 }
 205
 206 void gdlm_kobject_release(struct gdlm_ls *ls)
 207 {
 208         kobject_unregister(&ls->kobj);
 209 }
 210
 211 int gdlm_sysfs_init(void)
 212 {
 213         int error;
 214
 215         error = kset_register(&gdlm_kset);
 216         if (error)
 217                 printk("lock_dlm: cannot register kset %d\n", error);
 218
 219         return error;
 220 }
 221
 222 void gdlm_sysfs_exit(void)
 223 {
 224         kset_unregister(&gdlm_kset);
 225 }
 226