[linux-2.6-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>

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)
{
	proc_create_seq("devices", 0, NULL, &devinfo_ops);
	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>
fe251042 AD	7
	8	static int devinfo_show(struct seq_file f, void v)
	9	{
	10	int i = (loff_t ) v;
	11
8a932f73	12	if (i < CHRDEV_MAJOR_MAX) {
fe251042	13	if (i == 0)
9d6de12f	14	seq_puts(f, "Character devices:\n");
fe251042 AD	15	chrdev_show(f, i);
	16	}
	17	#ifdef CONFIG_BLOCK
	18	else {
8a932f73	19	i -= CHRDEV_MAJOR_MAX;
fe251042	20	if (i == 0)
9d6de12f	21	seq_puts(f, "\nBlock devices:\n");
fe251042 AD	22	blkdev_show(f, i);
	23	}
	24	#endif
	25	return 0;
	26	}
	27
	28	static void devinfo_start(struct seq_file f, loff_t *pos)
	29	{
133d55cd	30	if (*pos < (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX))
fe251042 AD	31	return pos;
	32	return NULL;
	33	}
	34
	35	static void devinfo_next(struct seq_file f, void v, loff_t pos)
	36	{
	37	(*pos)++;
133d55cd	38	if (*pos >= (BLKDEV_MAJOR_MAX + CHRDEV_MAJOR_MAX))
fe251042 AD	39	return NULL;
	40	return pos;
	41	}
	42
	43	static void devinfo_stop(struct seq_file f, void v)
	44	{
	45	/* Nothing to do */
	46	}
	47
	48	static const struct seq_operations devinfo_ops = {
	49	.start = devinfo_start,
	50	.next = devinfo_next,
	51	.stop = devinfo_stop,
	52	.show = devinfo_show
	53	};
	54
fe251042 AD	55	static int __init proc_devices_init(void)
fe251042 AD	56	{
fddda2b7	57	proc_create_seq("devices", 0, NULL, &devinfo_ops);
fe251042 AD	58	return 0;
fe251042 AD	59	}
abaf3787	60	fs_initcall(proc_devices_init);