masklog.c

  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, "%s\n", state);
 32}
 33
 34static 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
 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(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(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(&mlog_kset.kobj, "logmask");
167	mlog_kset.kobj.kset = o2cb_kset;
168	return kset_register(&mlog_kset);
169}
170
171void mlog_sys_shutdown(void)
172{
173	kset_unregister(&mlog_kset);
174}