forked from luck/tmp_suning_uos_patched
4b6f5d20b0
This is a conversion to make the various file_operations structs in fs/ const. Basically a regexp job, with a few manual fixups The goal is both to increase correctness (harder to accidentally write to shared datastructures) and reducing the false sharing of cachelines with things that get dirty in .data (while .rodata is nicely read only and thus cache clean) Signed-off-by: Arjan van de Ven <arjan@infradead.org> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
56 lines
1.1 KiB
C
56 lines
1.1 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/fs.h>
|
|
|
|
#include <asm/uaccess.h>
|
|
#include <asm/io.h>
|
|
|
|
extern wait_queue_head_t log_wait;
|
|
|
|
extern int do_syslog(int type, char __user *bug, int count);
|
|
|
|
static int kmsg_open(struct inode * inode, struct file * file)
|
|
{
|
|
return do_syslog(1,NULL,0);
|
|
}
|
|
|
|
static int kmsg_release(struct inode * inode, struct file * file)
|
|
{
|
|
(void) do_syslog(0,NULL,0);
|
|
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(9, NULL, 0))
|
|
return -EAGAIN;
|
|
return do_syslog(2, buf, count);
|
|
}
|
|
|
|
static unsigned int kmsg_poll(struct file *file, poll_table *wait)
|
|
{
|
|
poll_wait(file, &log_wait, wait);
|
|
if (do_syslog(9, NULL, 0))
|
|
return POLLIN | POLLRDNORM;
|
|
return 0;
|
|
}
|
|
|
|
|
|
const struct file_operations proc_kmsg_operations = {
|
|
.read = kmsg_read,
|
|
.poll = kmsg_poll,
|
|
.open = kmsg_open,
|
|
.release = kmsg_release,
|
|
};
|