// SPDX-License-Identifier: GPL-2.0#include <linux/fs.h>#include <linux/init.h>#include <linux/proc_fs.h>#include <linux/seq_file.h>#include <linux/blkdev.h>#include "internal.h" static int devinfo_show(struct seq_file *f, void *v){	int i = *(loff_t *) v; 	if (i < CHRDEV_MAJOR_MAX) {		if (i == 0)			seq_puts(f, "Character devices:\n");		chrdev_show(f, i);	}#ifdef CONFIG_BLOCK	else {		i -= CHRDEV_MAJOR_MAX;		if (i == 0)			seq_puts(f, "\nBlock devices:\n");		blkdev_show(f, i);	}#endif	return 0;} static void *devinfo_start(struct seq_file *f, loff_t *pos){	if (*pos < (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX))		return pos;	return NULL;} static void *devinfo_next(struct seq_file *f, void *v, loff_t *pos){	(*pos)++;	if (*pos >= (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX))		return NULL;	return pos;} static void devinfo_stop(struct seq_file *f, void *v){	/* Nothing to do */} static const struct seq_operations devinfo_ops = {	.start = devinfo_start,	.next  = devinfo_next,	.stop  = devinfo_stop,	.show  = devinfo_show}; static int __init proc_devices_init(void){	struct proc_dir_entry *pde; 	pde = proc_create_seq("devices", 0, NULL, &devinfo_ops);	pde_make_permanent(pde);	return 0;}fs_initcall(proc_devices_init);