proc: convert /proc/tty/ldiscs to seq_file interface

Note: THIS_MODULE and header addition aren't technically needed because
      this code is not modular, but let's keep it anyway because people
      can copy this code into modular code.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 45 insertions, 31 deletions

diff --git a/fs/proc/proc_tty.c b/fs/proc/proc_tty.c
index 63f45383035d..ac26ccc25f42 100644
--- a/fs/proc/proc_tty.c
+++ b/fs/proc/proc_tty.c
@@ -5,7 +5,7 @@
  */
 
 #include <asm/uaccess.h>
-
+#include <linux/module.h>
 #include <linux/init.h>
 #include <linux/errno.h>
 #include <linux/time.h>
@@ -136,39 +136,54 @@ static const struct file_operations proc_tty_drivers_operations = {
         .release        = seq_release,
 };
 
-/*
- * This is the handler for /proc/tty/ldiscs
- */
-static int tty_ldiscs_read_proc(char *page, char **start, off_t off,
-                                int count, int *eof, void *data)
+static void * tty_ldiscs_seq_start(struct seq_file *m, loff_t *pos)
 {
-        int     i;
-        int     len = 0;
-        off_t   begin = 0;
+        return (*pos < NR_LDISCS) ? pos : NULL;
+}
+
+static void * tty_ldiscs_seq_next(struct seq_file *m, void *v, loff_t *pos)
+{
+        (*pos)++;
+        return (*pos < NR_LDISCS) ? pos : NULL;
+}
+
+static void tty_ldiscs_seq_stop(struct seq_file *m, void *v)
+{
+}
+
+static int tty_ldiscs_seq_show(struct seq_file *m, void *v)
+{
+        int i = *(loff_t *)v;
         struct tty_ldisc *ld;
         
-        for (i=0; i < NR_LDISCS; i++) {
-                ld = tty_ldisc_get(i);
-                if (ld == NULL)
-                        continue;
-                len += sprintf(page+len, "%-10s %2d\n",
-                               ld->name ? ld->name : "???", i);
-                tty_ldisc_put(i);
-                if (len+begin > off+count)
-                        break;
-                if (len+begin < off) {
-                        begin += len;
-                        len = 0;
-                }
-        }
-        if (i >= NR_LDISCS)
-                *eof = 1;
-        if (off >= len+begin)
+        ld = tty_ldisc_get(i);
+        if (ld == NULL)
                 return 0;
-        *start = page + (off-begin);
-        return ((count < begin+len-off) ? count : begin+len-off);
+        seq_printf(m, "%-10s %2d\n", ld->name ? ld->name : "???", i);
+        tty_ldisc_put(i);
+        return 0;
+}
+
+static const struct seq_operations tty_ldiscs_seq_ops = {
+        .start  = tty_ldiscs_seq_start,
+        .next   = tty_ldiscs_seq_next,
+        .stop   = tty_ldiscs_seq_stop,
+        .show   = tty_ldiscs_seq_show,
+};
+
+static int proc_tty_ldiscs_open(struct inode *inode, struct file *file)
+{
+        return seq_open(file, &tty_ldiscs_seq_ops);
 }
 
+static const struct file_operations tty_ldiscs_proc_fops = {
+        .owner          = THIS_MODULE,
+        .open           = proc_tty_ldiscs_open,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release,
+};
+
 /*
  * This function is called by tty_register_driver() to handle
  * registering the driver's /proc handler into /proc/tty/driver/<foo>
@@ -223,8 +238,7 @@ void __init proc_tty_init(void)
          * password lengths and inter-keystroke timings during password
          * entry.
          */
-        proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR | S_IXUSR, NULL);
-
-        create_proc_read_entry("tty/ldiscs", 0, NULL, tty_ldiscs_read_proc, NULL);
+        proc_tty_driver = proc_mkdir_mode("tty/driver", S_IRUSR|S_IXUSR, NULL);
+        proc_create("tty/ldiscs", 0, NULL, &tty_ldiscs_proc_fops);
         proc_create("tty/drivers", 0, NULL, &proc_tty_drivers_operations);
 }