1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * Copyright (C) 2004, 2005 Oracle. All rights reserved.
6 */
7
8 #include <linux/module.h>
9 #include <linux/kernel.h>
10 #include <linux/proc_fs.h>
11 #include <linux/seq_file.h>
12 #include <linux/string.h>
13 #include <linux/uaccess.h>
14
15 #include "masklog.h"
16
17 struct mlog_bits mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK);
18 EXPORT_SYMBOL_GPL(mlog_and_bits);
19 struct mlog_bits mlog_not_bits = MLOG_BITS_RHS(0);
20 EXPORT_SYMBOL_GPL(mlog_not_bits);
21
mlog_mask_show(u64 mask,char * buf)22 static ssize_t mlog_mask_show(u64 mask, char *buf)
23 {
24 char *state;
25
26 if (__mlog_test_u64(mask, mlog_and_bits))
27 state = "allow";
28 else if (__mlog_test_u64(mask, mlog_not_bits))
29 state = "deny";
30 else
31 state = "off";
32
33 return snprintf(buf, PAGE_SIZE, "%s\n", state);
34 }
35
mlog_mask_store(u64 mask,const char * buf,size_t count)36 static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count)
37 {
38 if (!strncasecmp(buf, "allow", 5)) {
39 __mlog_set_u64(mask, mlog_and_bits);
40 __mlog_clear_u64(mask, mlog_not_bits);
41 } else if (!strncasecmp(buf, "deny", 4)) {
42 __mlog_set_u64(mask, mlog_not_bits);
43 __mlog_clear_u64(mask, mlog_and_bits);
44 } else if (!strncasecmp(buf, "off", 3)) {
45 __mlog_clear_u64(mask, mlog_not_bits);
46 __mlog_clear_u64(mask, mlog_and_bits);
47 } else
48 return -EINVAL;
49
50 return count;
51 }
52
__mlog_printk(const u64 * mask,const char * func,int line,const char * fmt,...)53 void __mlog_printk(const u64 *mask, const char *func, int line,
54 const char *fmt, ...)
55 {
56 struct va_format vaf;
57 va_list args;
58 const char *level;
59 const char *prefix = "";
60
61 if (!__mlog_test_u64(*mask, mlog_and_bits) ||
62 __mlog_test_u64(*mask, mlog_not_bits))
63 return;
64
65 if (*mask & ML_ERROR) {
66 level = KERN_ERR;
67 prefix = "ERROR: ";
68 } else if (*mask & ML_NOTICE) {
69 level = KERN_NOTICE;
70 } else {
71 level = KERN_INFO;
72 }
73
74 va_start(args, fmt);
75
76 vaf.fmt = fmt;
77 vaf.va = &args;
78
79 printk("%s(%s,%u,%u):%s:%d %s%pV",
80 level, current->comm, task_pid_nr(current),
81 raw_smp_processor_id(), func, line, prefix, &vaf);
82
83 va_end(args);
84 }
85 EXPORT_SYMBOL_GPL(__mlog_printk);
86
87 struct mlog_attribute {
88 struct attribute attr;
89 u64 mask;
90 };
91
92 #define to_mlog_attr(_attr) container_of(_attr, struct mlog_attribute, attr)
93
94 #define define_mask(_name) { \
95 .attr = { \
96 .name = #_name, \
97 .mode = S_IRUGO | S_IWUSR, \
98 }, \
99 .mask = ML_##_name, \
100 }
101
102 static struct mlog_attribute mlog_attrs[MLOG_MAX_BITS] = {
103 define_mask(TCP),
104 define_mask(MSG),
105 define_mask(SOCKET),
106 define_mask(HEARTBEAT),
107 define_mask(HB_BIO),
108 define_mask(DLMFS),
109 define_mask(DLM),
110 define_mask(DLM_DOMAIN),
111 define_mask(DLM_THREAD),
112 define_mask(DLM_MASTER),
113 define_mask(DLM_RECOVERY),
114 define_mask(DLM_GLUE),
115 define_mask(VOTE),
116 define_mask(CONN),
117 define_mask(QUORUM),
118 define_mask(BASTS),
119 define_mask(CLUSTER),
120 define_mask(ERROR),
121 define_mask(NOTICE),
122 define_mask(KTHREAD),
123 };
124
125 static struct attribute *mlog_attr_ptrs[MLOG_MAX_BITS] = {NULL, };
126
mlog_show(struct kobject * obj,struct attribute * attr,char * buf)127 static ssize_t mlog_show(struct kobject *obj, struct attribute *attr,
128 char *buf)
129 {
130 struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
131
132 return mlog_mask_show(mlog_attr->mask, buf);
133 }
134
mlog_store(struct kobject * obj,struct attribute * attr,const char * buf,size_t count)135 static ssize_t mlog_store(struct kobject *obj, struct attribute *attr,
136 const char *buf, size_t count)
137 {
138 struct mlog_attribute *mlog_attr = to_mlog_attr(attr);
139
140 return mlog_mask_store(mlog_attr->mask, buf, count);
141 }
142
143 static const struct sysfs_ops mlog_attr_ops = {
144 .show = mlog_show,
145 .store = mlog_store,
146 };
147
148 static struct kobj_type mlog_ktype = {
149 .default_attrs = mlog_attr_ptrs,
150 .sysfs_ops = &mlog_attr_ops,
151 };
152
153 static struct kset mlog_kset = {
154 .kobj = {.ktype = &mlog_ktype},
155 };
156
mlog_sys_init(struct kset * o2cb_kset)157 int mlog_sys_init(struct kset *o2cb_kset)
158 {
159 int i = 0;
160
161 while (mlog_attrs[i].attr.mode) {
162 mlog_attr_ptrs[i] = &mlog_attrs[i].attr;
163 i++;
164 }
165 mlog_attr_ptrs[i] = NULL;
166
167 kobject_set_name(&mlog_kset.kobj, "logmask");
168 mlog_kset.kobj.kset = o2cb_kset;
169 return kset_register(&mlog_kset);
170 }
171
mlog_sys_shutdown(void)172 void mlog_sys_shutdown(void)
173 {
174 kset_unregister(&mlog_kset);
175 }
176