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uml: convert to seq_file/proc_fops

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Convert code away from ->read_proc/->write_proc interfaces.  Switch to
proc_create()/proc_create_data() which make addition of proc entries
reliable wrt NULL ->proc_fops, NULL ->data and so on.

Problem with ->read_proc et al is described here commit
786d7e1612 "Fix rmmod/read/write races in
/proc entries"

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Jeff Dike <jdike@addtoit.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alexey Dobriyan 2009-12-14 18:00:11 -08:00 • committed by Linus Torvalds
parent 2886a8bdfa
commit 6613c5e860
4 changed files with 71 additions and 55 deletions
Download patch file Download diff file Expand all files Collapse all files

43
arch/um/kernel/exitcode.c
View file

@ -6,7 +6,9 @@
#include <linux/ctype.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#include <linux/types.h>
#include <asm/uaccess.h>
@ -16,30 +18,26 @@
*/
int uml_exitcode = 0;
static int read_proc_exitcode(char *page, char **start, off_t off,
int count, int *eof, void *data)
static int exitcode_proc_show(struct seq_file *m, void *v)
{
int len, val;
int val;
/*
* Save uml_exitcode in a local so that we don't need to guarantee
* that sprintf accesses it atomically.
*/
val = uml_exitcode;
len = sprintf(page, "%d\n", val);
len -= off;
if (len <= off+count)
*eof = 1;
*start = page + off;
if (len > count)
len = count;
if (len < 0)
len = 0;
return len;
seq_printf(m, "%d\n", val);
return 0;
}
static int write_proc_exitcode(struct file *file, const char __user *buffer,
unsigned long count, void *data)
static int exitcode_proc_open(struct inode *inode, struct file *file)
{
return single_open(file, exitcode_proc_show, NULL);
}
static ssize_t exitcode_proc_write(struct file *file,
const char __user *buffer, size_t count, loff_t *pos)
{
char *end, buf[sizeof("nnnnn\0")];
int tmp;
@ -55,20 +53,25 @@ static int write_proc_exitcode(struct file *file, const char __user *buffer,
return count;
}
static const struct file_operations exitcode_proc_fops = {
.owner = THIS_MODULE,
.open = exitcode_proc_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = exitcode_proc_write,
};
static int make_proc_exitcode(void)
{
struct proc_dir_entry *ent;
ent = create_proc_entry("exitcode", 0600, NULL);
ent = proc_create("exitcode", 0600, NULL, &exitcode_proc_fops);
if (ent == NULL) {
printk(KERN_WARNING "make_proc_exitcode : Failed to register "
"/proc/exitcode\n");
return 0;
}
ent->read_proc = read_proc_exitcode;
ent->write_proc = write_proc_exitcode;
return 0;
}