root/fs/proc/nommu.c

DEFINITIONS

1. nommu_vma_show
2. nommu_vma_list_show
3. nommu_vma_list_start
4. nommu_vma_list_stop
5. nommu_vma_list_next
6. proc_nommu_vma_list_open
7. proc_nommu_init

/* nommu.c: mmu-less memory info files
 *
 * Copyright (C) 2004 Red Hat, Inc. All Rights Reserved.
 * Written by David Howells (dhowells@redhat.com)
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#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/slab.h>
#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/hugetlb.h>
#include <linux/vmalloc.h>
#include <asm/uaccess.h>
#include <asm/pgtable.h>
#include <asm/tlb.h>
#include <asm/div64.h>
#include "internal.h"

/*
 * display a single VMA to a sequenced file
 */
int nommu_vma_show(struct seq_file *m, struct vm_area_struct *vma)
{
        unsigned long ino = 0;
        struct file *file;
        dev_t dev = 0;
        int flags, len;

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

        if (file) {
                struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
                dev = inode->i_sb->s_dev;
                ino = inode->i_ino;
        }

        seq_printf(m,
                   "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
                   vma->vm_start,
                   vma->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)vma->vm_pgoff) << PAGE_SHIFT,
                   MAJOR(dev), MINOR(dev), ino, &len);

        if (file) {
                len = 25 + sizeof(void *) * 6 - len;
                if (len < 1)
                        len = 1;
                seq_printf(m, "%*c", len, ' ');
                seq_path(m, &file->f_path, "");
        }

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

/*
 * display a list of all the VMAs the kernel knows about
 * - nommu kernals have a single flat list
 */
static int nommu_vma_list_show(struct seq_file *m, void *v)
{
        struct vm_area_struct *vma;

        vma = rb_entry((struct rb_node *) v, struct vm_area_struct, vm_rb);
        return nommu_vma_show(m, vma);
}

static void *nommu_vma_list_start(struct seq_file *m, loff_t *_pos)
{
        struct rb_node *_rb;
        loff_t pos = *_pos;
        void *next = NULL;

        down_read(&nommu_vma_sem);

        for (_rb = rb_first(&nommu_vma_tree); _rb; _rb = rb_next(_rb)) {
                if (pos == 0) {
                        next = _rb;
                        break;
                }
                pos--;
        }

        return next;
}

static void nommu_vma_list_stop(struct seq_file *m, void *v)
{
        up_read(&nommu_vma_sem);
}

static void *nommu_vma_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_vma_list_seqop = {
        .start  = nommu_vma_list_start,
        .next   = nommu_vma_list_next,
        .stop   = nommu_vma_list_stop,
        .show   = nommu_vma_list_show
};

static int proc_nommu_vma_list_open(struct inode *inode, struct file *file)
{
        return seq_open(file, &proc_nommu_vma_list_seqop);
}

static const struct file_operations proc_nommu_vma_list_operations = {
        .open    = proc_nommu_vma_list_open,
        .read    = seq_read,
        .llseek  = seq_lseek,
        .release = seq_release,
};

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

module_init(proc_nommu_init);