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

// SPDX-License-Identifier: GPL-2.0-or-later
/* nommu.c: mmu-less memory info files
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 */

#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>
#include <linux/time.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/mman.h>
#include <linux/proc_fs.h>
#include <linux/mm.h>
#include <linux/mmzone.h>
#include <linux/pagemap.h>
#include <linux/swap.h>
#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/hugetlb.h>
#include <linux/vmalloc.h>
#include <asm/tlb.h>
#include <asm/div64.h>
#include "internal.h"

/*
 * display a single region to a sequenced file
 */
static int nommu_region_show(struct seq_file *m, struct vm_region *region)
{
	unsigned long ino = 0;
	struct file *file;
	dev_t dev = 0;
	int flags;

	flags = region->vm_flags;
	file = region->vm_file;

	if (file) {
		struct inode *inode = file_inode(region->vm_file);
		dev = inode->i_sb->s_dev;
		ino = inode->i_ino;
	}

	seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
	seq_printf(m,
		   "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
		   region->vm_start,
		   region->vm_end,
		   flags & VM_READ ? 'r' : '-',
		   flags & VM_WRITE ? 'w' : '-',
		   flags & VM_EXEC ? 'x' : '-',
		   flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
		   ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
		   MAJOR(dev), MINOR(dev), ino);

	if (file) {
		seq_pad(m, ' ');
		seq_path(m, file_user_path(file), "");
	}

	seq_putc(m, '\n');
	return 0;
}

/*
 * display a list of all the REGIONs the kernel knows about
 * - nommu kernels have a single flat list
 */
static int nommu_region_list_show(struct seq_file *m, void *_p)
{
	struct rb_node *p = _p;

	return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
}

static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
{
	struct rb_node *p;
	loff_t pos = *_pos;

	down_read(&nommu_region_sem);

	for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
		if (pos-- == 0)
			return p;
	return NULL;
}

static void nommu_region_list_stop(struct seq_file *m, void *v)
{
	up_read(&nommu_region_sem);
}

static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
{
	(*pos)++;
	return rb_next((struct rb_node *) v);
}

static const struct seq_operations proc_nommu_region_list_seqop = {
	.start	= nommu_region_list_start,
	.next	= nommu_region_list_next,
	.stop	= nommu_region_list_stop,
	.show	= nommu_region_list_show
};

static int __init proc_nommu_init(void)
{
	proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop);
	return 0;
}

fs_initcall(proc_nommu_init);
Commit	Line	Data
2874c5fd	1	// SPDX-License-Identifier: GPL-2.0-or-later
1da177e4 LT	2	/* nommu.c: mmu-less memory info files
	3	*
	4	* Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
	5	* Written by David Howells (dhowells@redhat.com)
1da177e4 LT	6	*/
	7
	8	#include <linux/init.h>
	9	#include <linux/module.h>
	10	#include <linux/errno.h>
	11	#include <linux/time.h>
	12	#include <linux/kernel.h>
	13	#include <linux/string.h>
	14	#include <linux/mman.h>
	15	#include <linux/proc_fs.h>
	16	#include <linux/mm.h>
	17	#include <linux/mmzone.h>
	18	#include <linux/pagemap.h>
	19	#include <linux/swap.h>
1da177e4 LT	20	#include <linux/smp.h>
	21	#include <linux/seq_file.h>
	22	#include <linux/hugetlb.h>
	23	#include <linux/vmalloc.h>
1da177e4 LT	24	#include <asm/tlb.h>
	25	#include <asm/div64.h>
	26	#include "internal.h"
	27
	28	/*
8feae131	29	* display a single region to a sequenced file
1da177e4	30	*/
8feae131	31	static int nommu_region_show(struct seq_file m, struct vm_region region)
1da177e4	32	{
1da177e4 LT	33	unsigned long ino = 0;
	34	struct file *file;
	35	dev_t dev = 0;
652586df	36	int flags;
1da177e4	37
8feae131 DH	38	flags = region->vm_flags;
8feae131 DH	39	file = region->vm_file;
1da177e4 LT	40
1da177e4 LT	41	if (file) {
496ad9aa	42	struct inode *inode = file_inode(region->vm_file);
1da177e4 LT	43	dev = inode->i_sb->s_dev;
	44	ino = inode->i_ino;
	45	}
	46
652586df	47	seq_setwidth(m, 25 + sizeof(void ) 6 - 1);
1da177e4	48	seq_printf(m,
652586df	49	"%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
8feae131 DH	50	region->vm_start,
8feae131 DH	51	region->vm_end,
1da177e4 LT	52	flags & VM_READ ? 'r' : '-',
	53	flags & VM_WRITE ? 'w' : '-',
	54	flags & VM_EXEC ? 'x' : '-',
	55	flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
8feae131	56	((loff_t)region->vm_pgoff) << PAGE_SHIFT,
652586df	57	MAJOR(dev), MINOR(dev), ino);
1da177e4 LT	58
1da177e4 LT	59	if (file) {
652586df	60	seq_pad(m, ' ');
08582d67	61	seq_path(m, file_user_path(file), "");
1da177e4 LT	62	}
	63
	64	seq_putc(m, '\n');
	65	return 0;
	66	}
	67
dbf8685c	68	/*
8feae131	69	* display a list of all the REGIONs the kernel knows about
973c32be	70	* - nommu kernels have a single flat list
dbf8685c	71	*/
8feae131	72	static int nommu_region_list_show(struct seq_file m, void _p)
dbf8685c	73	{
8feae131	74	struct rb_node *p = _p;
dbf8685c	75
8feae131	76	return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
dbf8685c DH	77	}
dbf8685c DH	78
8feae131	79	static void nommu_region_list_start(struct seq_file m, loff_t *_pos)
1da177e4	80	{
8feae131	81	struct rb_node *p;
1da177e4	82	loff_t pos = *_pos;
1da177e4	83
8feae131	84	down_read(&nommu_region_sem);
1da177e4	85
8feae131 DH	86	for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
	87	if (pos-- == 0)
	88	return p;
	89	return NULL;
1da177e4 LT	90	}
1da177e4 LT	91
8feae131	92	static void nommu_region_list_stop(struct seq_file m, void v)
1da177e4	93	{
8feae131	94	up_read(&nommu_region_sem);
1da177e4 LT	95	}
1da177e4 LT	96
8feae131	97	static void nommu_region_list_next(struct seq_file m, void v, loff_t pos)
1da177e4 LT	98	{
	99	(*pos)++;
	100	return rb_next((struct rb_node *) v);
	101	}
	102
88e9d34c	103	static const struct seq_operations proc_nommu_region_list_seqop = {
8feae131 DH	104	.start = nommu_region_list_start,
	105	.next = nommu_region_list_next,
	106	.stop = nommu_region_list_stop,
	107	.show = nommu_region_list_show
1da177e4 LT	108	};
1da177e4 LT	109
1da177e4 LT	110	static int __init proc_nommu_init(void)
1da177e4 LT	111	{
fddda2b7	112	proc_create_seq("maps", S_IRUGO, NULL, &proc_nommu_region_list_seqop);
1da177e4 LT	113	return 0;
	114	}
	115
abaf3787	116	fs_initcall(proc_nommu_init);