fs/ocfs2/cluster/masklog.c

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * Copyright (C) 2004, 2005 Oracle.  All rights reserved.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2 of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public
  17  * License along with this program; if not, write to the
  18  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  19  * Boston, MA 021110-1307, USA.
  20  */
  21
  22 #include <linux/module.h>
  23 #include <linux/kernel.h>
  24 #include <linux/proc_fs.h>
  25 #include <linux/seq_file.h>
  26 #include <linux/string.h>
  27 #include <asm/uaccess.h>
  28
  29 #include "masklog.h"
  30
  31 struct mlog_bits mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK);
  32 EXPORT_SYMBOL_GPL(mlog_and_bits);
  33 struct mlog_bits mlog_not_bits = MLOG_BITS_RHS(0);
  34 EXPORT_SYMBOL_GPL(mlog_not_bits);
  35
  36 static ssize_t mlog_mask_show(u64 mask, char *buf)
  37 {
  38         char *state;
  39
  40         if (__mlog_test_u64(mask, mlog_and_bits))
  41                 state = "allow";
  42         else if (__mlog_test_u64(mask, mlog_not_bits))
  43                 state = "deny";
  44         else
  45                 state = "off";
  46
  47         return snprintf(buf, PAGE_SIZE, "%s\n", state);
  48 }
  49
  50 static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count)
  51 {
  52         if (!strncasecmp(buf, "allow", 5)) {
  53                 __mlog_set_u64(mask, mlog_and_bits);
  54                 __mlog_clear_u64(mask, mlog_not_bits);
  55         } else if (!strncasecmp(buf, "deny", 4)) {
  56                 __mlog_set_u64(mask, mlog_not_bits);
  57                 __mlog_clear_u64(mask, mlog_and_bits);
  58         } else if (!strncasecmp(buf, "off", 3)) {
  59                 __mlog_clear_u64(mask, mlog_not_bits);
  60                 __mlog_clear_u64(mask, mlog_and_bits);
  61         } else
  62                 return -EINVAL;
  63
  64         return count;
  65 }
  66
  67 struct mlog_attribute {
  68         struct attribute attr;
  69         u64 mask;
  70 };
  71
  72 #define to_mlog_attr(_attr) container_of(_attr, struct mlog_attribute, attr)
  73
  74 #define define_mask(_name) {                    \
  75         .attr = {                               \
  76                 .name = #_name,                 \
  77                 .mode = S_IRUGO | S_IWUSR,      \
  78         },                                      \
  79         .mask = ML_##_name,                     \
  80 }
  81
  82 static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = {
  83         define_mask(TCP),
  84         define_mask(MSG),
  85         define_mask(SOCKET),
  86         define_mask(HEARTBEAT),
  87         define_mask(HB_BIO),
  88         define_mask(DLMFS),
  89         define_mask(DLM),
  90         define_mask(DLM_DOMAIN),
  91         define_mask(DLM_THREAD),
  92         define_mask(DLM_MASTER),
  93         define_mask(DLM_RECOVERY),
  94         define_mask(DLM_GLUE),
  95         define_mask(VOTE),
  96         define_mask(CONN),
  97         define_mask(QUORUM),
  98         define_mask(BASTS),
  99         define_mask(CLUSTER),
 100         define_mask(ERROR),
 101         define_mask(NOTICE),
 102         define_mask(KTHREAD),
 103 };
 104
 105 static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, };
 106
 107 static ssize_t mlog_show(struct kobject *obj, struct attribute *attr,
 108                          char *buf)
 109 {
 110         struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
 111
 112         return mlog_mask_show(mlog_attr->mask, buf);
 113 }
 114
 115 static ssize_t mlog_store(struct kobject *obj, struct attribute *attr,
 116                           const char *buf, size_t count)
 117 {
 118         struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
 119
 120         return mlog_mask_store(mlog_attr->mask, buf, count);
 121 }
 122
 123 static const struct sysfs_ops mlog_attr_ops = {
 124         .show  = mlog_show,
 125         .store = mlog_store,
 126 };
 127
 128 static struct kobj_type mlog_ktype = {
 129         .default_attrs = mlog_attr_ptrs,
 130         .sysfs_ops     = &mlog_attr_ops,
 131 };
 132
 133 static struct kset mlog_kset = {
 134         .kobj   = {.ktype = &mlog_ktype},
 135 };
 136
 137 int mlog_sys_init(struct kset *o2cb_kset)
 138 {
 139         int i = 0;
 140
 141         while (mlog_attrs[i].attr.mode) {
 142                 mlog_attr_ptrs[i] = &mlog_attrs[i].attr;
 143                 i++;
 144         }
 145         mlog_attr_ptrs[i] = NULL;
 146
 147         kobject_set_name(&mlog_kset.kobj, "logmask");
 148         mlog_kset.kobj.kset = o2cb_kset;
 149         return kset_register(&mlog_kset);
 150 }
 151
 152 void mlog_sys_shutdown(void)
 153 {
 154         kset_unregister(&mlog_kset);
 155 }