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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/* nommu.c: mmu-less memory info files
2 *
3 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
4 * Written by David Howells (dhowells@redhat.com)
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License
8 * as published by the Free Software Foundation; either version
9 * 2 of the License, or (at your option) any later version.
10 */
11
12#include <linux/init.h>
13#include <linux/module.h>
14#include <linux/errno.h>
15#include <linux/time.h>
16#include <linux/kernel.h>
17#include <linux/string.h>
18#include <linux/mman.h>
19#include <linux/proc_fs.h>
20#include <linux/mm.h>
21#include <linux/mmzone.h>
22#include <linux/pagemap.h>
23#include <linux/swap.h>
24#include <linux/slab.h>
25#include <linux/smp.h>
26#include <linux/seq_file.h>
27#include <linux/hugetlb.h>
28#include <linux/vmalloc.h>
29#include <asm/uaccess.h>
30#include <asm/pgtable.h>
31#include <asm/tlb.h>
32#include <asm/div64.h>
33#include "internal.h"
34
35/*
David Howellsdbf86852006-09-27 01:50:19 -070036 * display a single VMA to a sequenced file
Linus Torvalds1da177e2005-04-16 15:20:36 -070037 */
David Howellsdbf86852006-09-27 01:50:19 -070038int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039{
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 unsigned long ino = 0;
41 struct file *file;
42 dev_t dev = 0;
43 int flags, len;
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 flags = vma->vm_flags;
46 file = vma->vm_file;
47
48 if (file) {
Josef "Jeff" Sipek2fddfee2006-12-08 02:36:36 -080049 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 dev = inode->i_sb->s_dev;
51 ino = inode->i_ino;
52 }
53
54 seq_printf(m,
Clement Calmels1804dc62008-08-20 14:09:00 -070055 "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
Linus Torvalds1da177e2005-04-16 15:20:36 -070056 vma->vm_start,
57 vma->vm_end,
58 flags & VM_READ ? 'r' : '-',
59 flags & VM_WRITE ? 'w' : '-',
60 flags & VM_EXEC ? 'x' : '-',
61 flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
Clement Calmels1804dc62008-08-20 14:09:00 -070062 ((loff_t)vma->vm_pgoff) << PAGE_SHIFT,
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 MAJOR(dev), MINOR(dev), ino, &len);
64
65 if (file) {
66 len = 25 + sizeof(void *) * 6 - len;
67 if (len < 1)
68 len = 1;
69 seq_printf(m, "%*c", len, ' ');
Jan Blunckc32c2f62008-02-14 19:38:43 -080070 seq_path(m, &file->f_path, "");
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 }
72
73 seq_putc(m, '\n');
74 return 0;
75}
76
David Howellsdbf86852006-09-27 01:50:19 -070077/*
78 * display a list of all the VMAs the kernel knows about
79 * - nommu kernals have a single flat list
80 */
81static int nommu_vma_list_show(struct seq_file *m, void *v)
82{
83 struct vm_area_struct *vma;
84
85 vma = rb_entry((struct rb_node *) v, struct vm_area_struct, vm_rb);
86 return nommu_vma_show(m, vma);
87}
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089static void *nommu_vma_list_start(struct seq_file *m, loff_t *_pos)
90{
91 struct rb_node *_rb;
92 loff_t pos = *_pos;
93 void *next = NULL;
94
95 down_read(&nommu_vma_sem);
96
97 for (_rb = rb_first(&nommu_vma_tree); _rb; _rb = rb_next(_rb)) {
98 if (pos == 0) {
99 next = _rb;
100 break;
101 }
David McCulloughb65574f2005-10-17 16:43:29 -0700102 pos--;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 }
104
105 return next;
106}
107
108static void nommu_vma_list_stop(struct seq_file *m, void *v)
109{
110 up_read(&nommu_vma_sem);
111}
112
113static void *nommu_vma_list_next(struct seq_file *m, void *v, loff_t *pos)
114{
115 (*pos)++;
116 return rb_next((struct rb_node *) v);
117}
118
Jan Engelhardt03a44822008-02-08 04:21:19 -0800119static const struct seq_operations proc_nommu_vma_list_seqop = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 .start = nommu_vma_list_start,
121 .next = nommu_vma_list_next,
122 .stop = nommu_vma_list_stop,
123 .show = nommu_vma_list_show
124};
125
126static int proc_nommu_vma_list_open(struct inode *inode, struct file *file)
127{
128 return seq_open(file, &proc_nommu_vma_list_seqop);
129}
130
Arjan van de Ven00977a52007-02-12 00:55:34 -0800131static const struct file_operations proc_nommu_vma_list_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 .open = proc_nommu_vma_list_open,
133 .read = seq_read,
134 .llseek = seq_lseek,
135 .release = seq_release,
136};
137
138static int __init proc_nommu_init(void)
139{
Alexey Dobriyan0d5c9f52008-04-29 01:01:37 -0700140 proc_create("maps", S_IRUGO, NULL, &proc_nommu_vma_list_operations);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141 return 0;
142}
143
144module_init(proc_nommu_init);