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>

4 files changed, 70 insertions, 54 deletions

diff --git a/arch/um/drivers/mconsole_kern.c b/arch/um/drivers/mconsole_kern.c
index e14629c87de4..f0fa47f10e6c 100644
--- a/arch/um/drivers/mconsole_kern.c
+++ b/arch/um/drivers/mconsole_kern.c
@@ -833,8 +833,8 @@ static int __init mconsole_init(void)
 
 __initcall(mconsole_init);
 
-static int write_proc_mconsole(struct file *file, const char __user *buffer,
-                               unsigned long count, void *data)
+static ssize_t mconsole_proc_write(struct file *file,
+                const char __user *buffer, size_t count, loff_t *pos)
 {
         char *buf;
 
@@ -855,6 +855,11 @@ static int write_proc_mconsole(struct file *file, const char __user *buffer,
         return count;
 }
 
+static const struct file_operations mconsole_proc_fops = {
+        .owner          = THIS_MODULE,
+        .write          = mconsole_proc_write,
+};
+
 static int create_proc_mconsole(void)
 {
         struct proc_dir_entry *ent;
@@ -862,15 +867,12 @@ static int create_proc_mconsole(void)
         if (notify_socket == NULL)
                 return 0;
 
-        ent = create_proc_entry("mconsole", S_IFREG | 0200, NULL);
+        ent = proc_create("mconsole", 0200, NULL, &mconsole_proc_fops);
         if (ent == NULL) {
                 printk(KERN_INFO "create_proc_mconsole : create_proc_entry "
                        "failed\n");
                 return 0;
         }
-
-        ent->read_proc = NULL;
-        ent->write_proc = write_proc_mconsole;
         return 0;
 }
 
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index 635d16d90a80..5ff554677f40 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -27,6 +27,7 @@
 #include "linux/init.h"
 #include "linux/cdrom.h"
 #include "linux/proc_fs.h"
+#include "linux/seq_file.h"
 #include "linux/ctype.h"
 #include "linux/capability.h"
 #include "linux/mm.h"
@@ -200,23 +201,25 @@ static void make_proc_ide(void)
         proc_ide = proc_mkdir("ide0", proc_ide_root);
 }
 
-static int proc_ide_read_media(char *page, char **start, off_t off, int count,
-                               int *eof, void *data)
+static int fake_ide_media_proc_show(struct seq_file *m, void *v)
 {
-        int len;
-
-        strcpy(page, "disk\n");
-        len = strlen("disk\n");
-        len -= off;
-        if (len < count){
-                *eof = 1;
-                if (len <= 0) return 0;
-        }
-        else len = count;
-        *start = page + off;
-        return len;
+        seq_puts(m, "disk\n");
+        return 0;
+}
+
+static int fake_ide_media_proc_open(struct inode *inode, struct file *file)
+{
+        return single_open(file, fake_ide_media_proc_show, NULL);
 }
 
+static const struct file_operations fake_ide_media_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = fake_ide_media_proc_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = single_release,
+};
+
 static void make_ide_entries(const char *dev_name)
 {
         struct proc_dir_entry *dir, *ent;
@@ -227,11 +230,8 @@ static void make_ide_entries(const char *dev_name)
         dir = proc_mkdir(dev_name, proc_ide);
         if(!dir) return;
 
-        ent = create_proc_entry("media", S_IFREG|S_IRUGO, dir);
+        ent = proc_create("media", S_IRUGO, dir, &fake_ide_media_proc_fops);
         if(!ent) return;
-        ent->data = NULL;
-        ent->read_proc = proc_ide_read_media;
-        ent->write_proc = NULL;
         snprintf(name, sizeof(name), "ide0/%s", dev_name);
         proc_symlink(dev_name, proc_ide_root, name);
 }
diff --git a/arch/um/kernel/exitcode.c b/arch/um/kernel/exitcode.c
index 6540d2c9fbb7..829df49dee99 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 4a28a1568d85..2f910a1b7454 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;
 }