1 // SPDX-License-Identifier: GPL-2.0
3 #include <linux/init.h>
4 #include <linux/proc_fs.h>
5 #include <linux/seq_file.h>
6 #include <linux/blkdev.h>
9 static int devinfo_show(struct seq_file
*f
, void *v
)
11 int i
= *(loff_t
*) v
;
13 if (i
< CHRDEV_MAJOR_MAX
) {
15 seq_puts(f
, "Character devices:\n");
20 i
-= CHRDEV_MAJOR_MAX
;
22 seq_puts(f
, "\nBlock devices:\n");
29 static void *devinfo_start(struct seq_file
*f
, loff_t
*pos
)
31 if (*pos
< (BLKDEV_MAJOR_MAX
+ CHRDEV_MAJOR_MAX
))
36 static void *devinfo_next(struct seq_file
*f
, void *v
, loff_t
*pos
)
39 if (*pos
>= (BLKDEV_MAJOR_MAX
+ CHRDEV_MAJOR_MAX
))
44 static void devinfo_stop(struct seq_file
*f
, void *v
)
49 static const struct seq_operations devinfo_ops
= {
50 .start
= devinfo_start
,
56 static int __init
proc_devices_init(void)
58 struct proc_dir_entry
*pde
;
60 pde
= proc_create_seq("devices", 0, NULL
, &devinfo_ops
);
61 pde_make_permanent(pde
);
64 fs_initcall(proc_devices_init
);