[linux-block.git] / fs / proc / devices.c

// 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);
Commit	Line	Data
b2441318	1	// SPDX-License-Identifier: GPL-2.0
fe251042 AD	2	#include <linux/fs.h>
	3	#include <linux/init.h>
	4	#include <linux/proc_fs.h>
	5	#include <linux/seq_file.h>
3f1266f1	6	#include <linux/blkdev.h>
ef1d6178	7	#include "internal.h"
fe251042 AD	8
	9	static int devinfo_show(struct seq_file f, void v)
	10	{
	11	int i = (loff_t ) v;
	12
8a932f73	13	if (i < CHRDEV_MAJOR_MAX) {
fe251042	14	if (i == 0)
9d6de12f	15	seq_puts(f, "Character devices:\n");
fe251042 AD	16	chrdev_show(f, i);
	17	}
	18	#ifdef CONFIG_BLOCK
	19	else {
8a932f73	20	i -= CHRDEV_MAJOR_MAX;
fe251042	21	if (i == 0)
9d6de12f	22	seq_puts(f, "\nBlock devices:\n");
fe251042 AD	23	blkdev_show(f, i);
	24	}
	25	#endif
	26	return 0;
	27	}
	28
	29	static void devinfo_start(struct seq_file f, loff_t *pos)
	30	{
133d55cd	31	if (*pos < (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX))
fe251042 AD	32	return pos;
	33	return NULL;
	34	}
	35
	36	static void devinfo_next(struct seq_file f, void v, loff_t pos)
	37	{
	38	(*pos)++;
133d55cd	39	if (*pos >= (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX))
fe251042 AD	40	return NULL;
	41	return pos;
	42	}
	43
	44	static void devinfo_stop(struct seq_file f, void v)
	45	{
	46	/* Nothing to do */
	47	}
	48
	49	static const struct seq_operations devinfo_ops = {
	50	.start = devinfo_start,
	51	.next = devinfo_next,
	52	.stop = devinfo_stop,
	53	.show = devinfo_show
	54	};
	55
fe251042 AD	56	static int __init proc_devices_init(void)
fe251042 AD	57	{
ef1d6178 AD	58	struct proc_dir_entry *pde;
	59
	60	pde = proc_create_seq("devices", 0, NULL, &devinfo_ops);
	61	pde_make_permanent(pde);
fe251042 AD	62	return 0;
fe251042 AD	63	}
abaf3787	64	fs_initcall(proc_devices_init);