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authorAlexey Dobriyan <adobriyan@gmail.com>2009-12-14 18:00:11 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-12-15 08:53:25 -0800
commit6613c5e8603bc41741487828f48c6a4d701f7814 (patch)
tree821a045f88cbe2a03aed9aa4d8c56b0015b2b208 /arch/um/kernel
parent2886a8bdfa007053b414ab01741a98c18c376a85 (diff)
uml: convert to seq_file/proc_fops
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 786d7e1612f0b0adb6046f19b906609e4fe8b1ba "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>
Diffstat (limited to 'arch/um/kernel')
-rw-r--r--arch/um/kernel/exitcode.c43
-rw-r--r--arch/um/kernel/process.c31
2 files changed, 44 insertions, 30 deletions
diff --git a/arch/um/kernel/exitcode.c b/arch/um/kernel/exitcode.c
index 6540d2c9fbb..829df49dee9 100644
--- a/arch/um/kernel/exitcode.c
+++ b/arch/um/kernel/exitcode.c
@@ -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 exitcode_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, exitcode_proc_show, NULL);
}
-static int write_proc_exitcode(struct file *file, const char __user *buffer,
- unsigned long count, void *data)
+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;
}
diff --git a/arch/um/kernel/process.c b/arch/um/kernel/process.c
index 4a28a1568d8..2f910a1b745 100644
--- a/arch/um/kernel/process.c
+++ b/arch/um/kernel/process.c
@@ -9,11 +9,13 @@
#include <linux/hardirq.h>
#include <linux/gfp.h>
#include <linux/mm.h>
+#include <linux/module.h>
#include <linux/personality.h>
#include <linux/proc_fs.h>
#include <linux/ptrace.h>
#include <linux/random.h>
#include <linux/sched.h>
+#include <linux/seq_file.h>
#include <linux/tick.h>
#include <linux/threads.h>
#include <asm/current.h>
@@ -336,16 +338,19 @@ int get_using_sysemu(void)
return atomic_read(&using_sysemu);
}
-static int proc_read_sysemu(char *buf, char **start, off_t offset, int size,int *eof, void *data)
+static int sysemu_proc_show(struct seq_file *m, void *v)
{
- if (snprintf(buf, size, "%d\n", get_using_sysemu()) < size)
- /* No overflow */
- *eof = 1;
+ seq_printf(m, "%d\n", get_using_sysemu());
+ return 0;
+}
- return strlen(buf);
+static int sysemu_proc_open(struct inode *inode, struct file *file)
+{
+ return single_open(file, sysemu_proc_show, NULL);
}
-static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned long count,void *data)
+static ssize_t sysemu_proc_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *pos)
{
char tmp[2];
@@ -358,13 +363,22 @@ static int proc_write_sysemu(struct file *file,const char __user *buf, unsigned
return count;
}
+static const struct file_operations sysemu_proc_fops = {
+ .owner = THIS_MODULE,
+ .open = sysemu_proc_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = single_release,
+ .write = sysemu_proc_write,
+};
+
int __init make_proc_sysemu(void)
{
struct proc_dir_entry *ent;
if (!sysemu_supported)
return 0;
- ent = create_proc_entry("sysemu", 0600, NULL);
+ ent = proc_create("sysemu", 0600, NULL, &sysemu_proc_fops);
if (ent == NULL)
{
@@ -372,9 +386,6 @@ int __init make_proc_sysemu(void)
return 0;
}
- ent->read_proc = proc_read_sysemu;
- ent->write_proc = proc_write_sysemu;
-
return 0;
}