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 void __mlog_printk(const u64 *mask, const char *func, int line,
  68                    const char *fmt, ...)
  69 {
  70         struct va_format vaf;
  71         va_list args;
  72         const char *level;
  73         const char *prefix = "";
  74
  75         if (!__mlog_test_u64(*mask, mlog_and_bits) ||
  76             __mlog_test_u64(*mask, mlog_not_bits))
  77                 return;
  78
  79         if (*mask & ML_ERROR) {
  80                 level = KERN_ERR;
  81                 prefix = "ERROR: ";
  82         } else if (*mask & ML_NOTICE) {
  83                 level = KERN_NOTICE;
  84         } else {
  85                 level = KERN_INFO;
  86         }
  87
  88         va_start(args, fmt);
  89
  90         vaf.fmt = fmt;
  91         vaf.va = &args;
  92
  93         printk("%s(%s,%u,%u):%s:%d %s%pV",
  94                level, current->comm, task_pid_nr(current),
  95                raw_smp_processor_id(), func, line, prefix, &vaf);
  96
  97         va_end(args);
  98 }
  99 EXPORT_SYMBOL_GPL(__mlog_printk);
 100
 101 struct mlog_attribute {
 102         struct attribute attr;
 103         u64 mask;
 104 };
 105
 106 #define to_mlog_attr(_attr) container_of(_attr, struct mlog_attribute, attr)
 107
 108 #define define_mask(_name) {                    \
 109         .attr = {                               \
 110                 .name = #_name,                 \
 111                 .mode = S_IRUGO | S_IWUSR,      \
 112         },                                      \
 113         .mask = ML_##_name,                     \
 114 }
 115
 116 static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = {
 117         define_mask(TCP),
 118         define_mask(MSG),
 119         define_mask(SOCKET),
 120         define_mask(HEARTBEAT),
 121         define_mask(HB_BIO),
 122         define_mask(DLMFS),
 123         define_mask(DLM),
 124         define_mask(DLM_DOMAIN),
 125         define_mask(DLM_THREAD),
 126         define_mask(DLM_MASTER),
 127         define_mask(DLM_RECOVERY),
 128         define_mask(DLM_GLUE),
 129         define_mask(VOTE),
 130         define_mask(CONN),
 131         define_mask(QUORUM),
 132         define_mask(BASTS),
 133         define_mask(CLUSTER),
 134         define_mask(ERROR),
 135         define_mask(NOTICE),
 136         define_mask(KTHREAD),
 137 };
 138
 139 static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, };
 140
 141 static ssize_t mlog_show(struct kobject *obj, struct attribute *attr,
 142                          char *buf)
 143 {
 144         struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
 145
 146         return mlog_mask_show(mlog_attr->mask, buf);
 147 }
 148
 149 static ssize_t mlog_store(struct kobject *obj, struct attribute *attr,
 150                           const char *buf, size_t count)
 151 {
 152         struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
 153
 154         return mlog_mask_store(mlog_attr->mask, buf, count);
 155 }
 156
 157 static const struct sysfs_ops mlog_attr_ops = {
 158         .show  = mlog_show,
 159         .store = mlog_store,
 160 };
 161
 162 static struct kobj_type mlog_ktype = {
 163         .default_attrs = mlog_attr_ptrs,
 164         .sysfs_ops     = &mlog_attr_ops,
 165 };
 166
 167 static struct kset mlog_kset = {
 168         .kobj   = {.ktype = &mlog_ktype},
 169 };
 170
 171 int mlog_sys_init(struct kset *o2cb_kset)
 172 {
 173         int i = 0;
 174
 175         while (mlog_attrs[i].attr.mode) {
 176                 mlog_attr_ptrs[i] = &mlog_attrs[i].attr;
 177                 i++;
 178         }
 179         mlog_attr_ptrs[i] = NULL;
 180
 181         kobject_set_name(&mlog_kset.kobj, "logmask");
 182         mlog_kset.kobj.kset = o2cb_kset;
 183         return kset_register(&mlog_kset);
 184 }
 185
 186 void mlog_sys_shutdown(void)
 187 {
 188         kset_unregister(&mlog_kset);
 189 }