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
15struct mlog_bits mlog_and_bits = MLOG_BITS_RHS(MLOG_INITIAL_AND_MASK);
16EXPORT_SYMBOL_GPL(mlog_and_bits);
17struct mlog_bits mlog_not_bits = MLOG_BITS_RHS(0);
18EXPORT_SYMBOL_GPL(mlog_not_bits);
19
20static 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, fmt: "%s\n", state);
32}
33
34static ssize_t mlog_mask_store(u64 mask, const char *buf, size_t count)
35{
36 if (!strncasecmp(s1: buf, s2: "allow", n: 5)) {
37 __mlog_set_u64(mask, mlog_and_bits);
38 __mlog_clear_u64(mask, mlog_not_bits);
39 } else if (!strncasecmp(s1: buf, s2: "deny", n: 4)) {
40 __mlog_set_u64(mask, mlog_not_bits);
41 __mlog_clear_u64(mask, mlog_and_bits);
42 } else if (!strncasecmp(s1: buf, s2: "off", n: 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
51void __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}
83EXPORT_SYMBOL_GPL(__mlog_printk);
84
85struct 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
100static 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
123static struct attribute *mlog_default_attrs[MLOG_MAX_BITS] = {NULL, };
124ATTRIBUTE_GROUPS(mlog_default);
125
126static 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(mask: mlog_attr->mask, buf);
132}
133
134static 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(mask: mlog_attr->mask, buf, count);
140}
141
142static const struct sysfs_ops mlog_attr_ops = {
143 .show = mlog_show,
144 .store = mlog_store,
145};
146
147static struct kobj_type mlog_ktype = {
148 .default_groups = mlog_default_groups,
149 .sysfs_ops = &mlog_attr_ops,
150};
151
152static struct kset mlog_kset = {
153 .kobj = {.ktype = &mlog_ktype},
154};
155
156int 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(kobj: &mlog_kset.kobj, name: "logmask");
167 mlog_kset.kobj.kset = o2cb_kset;
168 return kset_register(kset: &mlog_kset);
169}
170
171void mlog_sys_shutdown(void)
172{
173 kset_unregister(kset: &mlog_kset);
174}
175

source code of linux/fs/ocfs2/cluster/masklog.c