LXR linux/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
  31struct mlog_bits mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK);
  32EXPORT_SYMBOL_GPL(mlog_and_bits);
  33struct mlog_bits mlog_not_bits = MLOG_BITS_RHS(0);
  34EXPORT_SYMBOL_GPL(mlog_not_bits);
  35
  36static 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
  50static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count)
  51{
  52        if (!strnicmp(buf, "allow", 5)) {
  53                __mlog_set_u64(mask, mlog_and_bits);
  54                __mlog_clear_u64(mask, mlog_not_bits);
  55        } else if (!strnicmp(buf, "deny", 4)) {
  56                __mlog_set_u64(mask, mlog_not_bits);
  57                __mlog_clear_u64(mask, mlog_and_bits);
  58        } else if (!strnicmp(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
  67struct 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
  82static 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
 105static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, };
 106
 107static 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
 115static 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
 123static const struct sysfs_ops mlog_attr_ops = {
 124        .show  = mlog_show,
 125        .store = mlog_store,
 126};
 127
 128static struct kobj_type mlog_ktype = {
 129        .default_attrs = mlog_attr_ptrs,
 130        .sysfs_ops     = &mlog_attr_ops,
 131};
 132
 133static struct kset mlog_kset = {
 134        .kobj   = {.ktype = &mlog_ktype},
 135};
 136
 137int 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
 152void mlog_sys_shutdown(void)
 153{
 154        kset_unregister(&mlog_kset);
 155}
 156