mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-11-01 08:58:07 +00:00
41775e29a7
No need to hold the bkl to seek here, none of the other fops callbacks use it. Use generic_file_llseek explicitly. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Ingo Molnar <mingo@elte.hu> Cc: John Kacur <jkacur@redhat.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Al Viro <viro@ZenIV.linux.org.uk>
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/*
|
|
* linux/fs/proc/kmsg.c
|
|
*
|
|
* Copyright (C) 1992 by Linus Torvalds
|
|
*
|
|
*/
|
|
|
|
#include <linux/types.h>
|
|
#include <linux/errno.h>
|
|
#include <linux/time.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/poll.h>
|
|
#include <linux/proc_fs.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/syslog.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/io.h>
|
|
|
|
extern wait_queue_head_t log_wait;
|
|
|
|
static int kmsg_open(struct inode * inode, struct file * file)
|
|
{
|
|
return do_syslog(SYSLOG_ACTION_OPEN, NULL, 0, SYSLOG_FROM_FILE);
|
|
}
|
|
|
|
static int kmsg_release(struct inode * inode, struct file * file)
|
|
{
|
|
(void) do_syslog(SYSLOG_ACTION_CLOSE, NULL, 0, SYSLOG_FROM_FILE);
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t kmsg_read(struct file *file, char __user *buf,
|
|
size_t count, loff_t *ppos)
|
|
{
|
|
if ((file->f_flags & O_NONBLOCK) &&
|
|
!do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_FILE))
|
|
return -EAGAIN;
|
|
return do_syslog(SYSLOG_ACTION_READ, buf, count, SYSLOG_FROM_FILE);
|
|
}
|
|
|
|
static unsigned int kmsg_poll(struct file *file, poll_table *wait)
|
|
{
|
|
poll_wait(file, &log_wait, wait);
|
|
if (do_syslog(SYSLOG_ACTION_SIZE_UNREAD, NULL, 0, SYSLOG_FROM_FILE))
|
|
return POLLIN | POLLRDNORM;
|
|
return 0;
|
|
}
|
|
|
|
|
|
static const struct file_operations proc_kmsg_operations = {
|
|
.read = kmsg_read,
|
|
.poll = kmsg_poll,
|
|
.open = kmsg_open,
|
|
.release = kmsg_release,
|
|
.llseek = generic_file_llseek,
|
|
};
|
|
|
|
static int __init proc_kmsg_init(void)
|
|
{
|
|
proc_create("kmsg", S_IRUSR, NULL, &proc_kmsg_operations);
|
|
return 0;
|
|
}
|
|
module_init(proc_kmsg_init);
|