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