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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 <linux/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 }
190 

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