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Linux/fs/ocfs2/cluster/masklog.c

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  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 (!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 
 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 }
156 

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