linux/drivers/md/dm-vdo/logger.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright 2023 Red Hat
 */

#include "logger.h"

#include <asm/current.h>
#include <linux/delay.h>
#include <linux/hardirq.h>
#include <linux/module.h>
#include <linux/printk.h>
#include <linux/sched.h>

#include "errors.h"
#include "thread-device.h"
#include "thread-utils.h"

int vdo_log_level = …;

int vdo_get_log_level(void)
{ … }

static const char *get_current_interrupt_type(void)
{ … }

/**
 * emit_log_message_to_kernel() - Emit a log message to the kernel at the specified priority.
 *
 * @priority: The priority at which to log the message
 * @fmt: The format string of the message
 */
static void emit_log_message_to_kernel(int priority, const char *fmt, ...)
{ … }

/**
 * emit_log_message() - Emit a log message to the kernel log in a format suited to the current
 *                      thread context.
 *
 * Context info formats:
 *
 * interrupt:           uds[NMI]: blah
 * kvdo thread:         kvdo12:foobarQ: blah
 * thread w/device id:  kvdo12:myprog: blah
 * other thread:        uds: myprog: blah
 *
 * Fields: module name, interrupt level, process name, device ID.
 *
 * @priority: the priority at which to log the message
 * @module: The name of the module doing the logging
 * @prefix: The prefix of the log message
 * @vaf1: The first message format descriptor
 * @vaf2: The second message format descriptor
 */
static void emit_log_message(int priority, const char *module, const char *prefix,
			     const struct va_format *vaf1, const struct va_format *vaf2)
{ … }

/*
 * vdo_log_embedded_message() - Log a message embedded within another message.
 * @priority: the priority at which to log the message
 * @module: the name of the module doing the logging
 * @prefix: optional string prefix to message, may be NULL
 * @fmt1: format of message first part (required)
 * @args1: arguments for message first part (required)
 * @fmt2: format of message second part
 */
void vdo_log_embedded_message(int priority, const char *module, const char *prefix,
			      const char *fmt1, va_list args1, const char *fmt2, ...)
{ … }

int vdo_vlog_strerror(int priority, int errnum, const char *module, const char *format,
		      va_list args)
{ … }

int __vdo_log_strerror(int priority, int errnum, const char *module, const char *format, ...)
{ … }

void vdo_log_backtrace(int priority)
{ … }

void __vdo_log_message(int priority, const char *module, const char *format, ...)
{ … }

/*
 * Sleep or delay a few milliseconds in an attempt to allow the log buffers to be flushed lest they
 * be overrun.
 */
void vdo_pause_for_logger(void)
{ … }