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TOMOYO Linux Cross Reference
Linux/fs/proc/nommu.c

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  1 /* 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/smp.h>
 25 #include <linux/seq_file.h>
 26 #include <linux/hugetlb.h>
 27 #include <linux/vmalloc.h>
 28 #include <linux/uaccess.h>
 29 #include <asm/pgtable.h>
 30 #include <asm/tlb.h>
 31 #include <asm/div64.h>
 32 #include "internal.h"
 33 
 34 /*
 35  * display a single region to a sequenced file
 36  */
 37 static int nommu_region_show(struct seq_file *m, struct vm_region *region)
 38 {
 39         unsigned long ino = 0;
 40         struct file *file;
 41         dev_t dev = 0;
 42         int flags;
 43 
 44         flags = region->vm_flags;
 45         file = region->vm_file;
 46 
 47         if (file) {
 48                 struct inode *inode = file_inode(region->vm_file);
 49                 dev = inode->i_sb->s_dev;
 50                 ino = inode->i_ino;
 51         }
 52 
 53         seq_setwidth(m, 25 + sizeof(void *) * 6 - 1);
 54         seq_printf(m,
 55                    "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu ",
 56                    region->vm_start,
 57                    region->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',
 62                    ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
 63                    MAJOR(dev), MINOR(dev), ino);
 64 
 65         if (file) {
 66                 seq_pad(m, ' ');
 67                 seq_file_path(m, file, "");
 68         }
 69 
 70         seq_putc(m, '\n');
 71         return 0;
 72 }
 73 
 74 /*
 75  * display a list of all the REGIONs the kernel knows about
 76  * - nommu kernels have a single flat list
 77  */
 78 static int nommu_region_list_show(struct seq_file *m, void *_p)
 79 {
 80         struct rb_node *p = _p;
 81 
 82         return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
 83 }
 84 
 85 static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
 86 {
 87         struct rb_node *p;
 88         loff_t pos = *_pos;
 89 
 90         down_read(&nommu_region_sem);
 91 
 92         for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
 93                 if (pos-- == 0)
 94                         return p;
 95         return NULL;
 96 }
 97 
 98 static void nommu_region_list_stop(struct seq_file *m, void *v)
 99 {
100         up_read(&nommu_region_sem);
101 }
102 
103 static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
104 {
105         (*pos)++;
106         return rb_next((struct rb_node *) v);
107 }
108 
109 static const struct seq_operations proc_nommu_region_list_seqop = {
110         .start  = nommu_region_list_start,
111         .next   = nommu_region_list_next,
112         .stop   = nommu_region_list_stop,
113         .show   = nommu_region_list_show
114 };
115 
116 static int proc_nommu_region_list_open(struct inode *inode, struct file *file)
117 {
118         return seq_open(file, &proc_nommu_region_list_seqop);
119 }
120 
121 static const struct file_operations proc_nommu_region_list_operations = {
122         .open    = proc_nommu_region_list_open,
123         .read    = seq_read,
124         .llseek  = seq_lseek,
125         .release = seq_release,
126 };
127 
128 static int __init proc_nommu_init(void)
129 {
130         proc_create("maps", S_IRUGO, NULL, &proc_nommu_region_list_operations);
131         return 0;
132 }
133 
134 fs_initcall(proc_nommu_init);
135 

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