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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 <asm/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, len;
 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_printf(m,
 54                    "%08lx-%08lx %c%c%c%c %08llx %02x:%02x %lu %n",
 55                    region->vm_start,
 56                    region->vm_end,
 57                    flags & VM_READ ? 'r' : '-',
 58                    flags & VM_WRITE ? 'w' : '-',
 59                    flags & VM_EXEC ? 'x' : '-',
 60                    flags & VM_MAYSHARE ? flags & VM_SHARED ? 'S' : 's' : 'p',
 61                    ((loff_t)region->vm_pgoff) << PAGE_SHIFT,
 62                    MAJOR(dev), MINOR(dev), ino, &len);
 63 
 64         if (file) {
 65                 len = 25 + sizeof(void *) * 6 - len;
 66                 if (len < 1)
 67                         len = 1;
 68                 seq_printf(m, "%*c", len, ' ');
 69                 seq_path(m, &file->f_path, "");
 70         }
 71 
 72         seq_putc(m, '\n');
 73         return 0;
 74 }
 75 
 76 /*
 77  * display a list of all the REGIONs the kernel knows about
 78  * - nommu kernels have a single flat list
 79  */
 80 static int nommu_region_list_show(struct seq_file *m, void *_p)
 81 {
 82         struct rb_node *p = _p;
 83 
 84         return nommu_region_show(m, rb_entry(p, struct vm_region, vm_rb));
 85 }
 86 
 87 static void *nommu_region_list_start(struct seq_file *m, loff_t *_pos)
 88 {
 89         struct rb_node *p;
 90         loff_t pos = *_pos;
 91 
 92         down_read(&nommu_region_sem);
 93 
 94         for (p = rb_first(&nommu_region_tree); p; p = rb_next(p))
 95                 if (pos-- == 0)
 96                         return p;
 97         return NULL;
 98 }
 99 
100 static void nommu_region_list_stop(struct seq_file *m, void *v)
101 {
102         up_read(&nommu_region_sem);
103 }
104 
105 static void *nommu_region_list_next(struct seq_file *m, void *v, loff_t *pos)
106 {
107         (*pos)++;
108         return rb_next((struct rb_node *) v);
109 }
110 
111 static const struct seq_operations proc_nommu_region_list_seqop = {
112         .start  = nommu_region_list_start,
113         .next   = nommu_region_list_next,
114         .stop   = nommu_region_list_stop,
115         .show   = nommu_region_list_show
116 };
117 
118 static int proc_nommu_region_list_open(struct inode *inode, struct file *file)
119 {
120         return seq_open(file, &proc_nommu_region_list_seqop);
121 }
122 
123 static const struct file_operations proc_nommu_region_list_operations = {
124         .open    = proc_nommu_region_list_open,
125         .read    = seq_read,
126         .llseek  = seq_lseek,
127         .release = seq_release,
128 };
129 
130 static int __init proc_nommu_init(void)
131 {
132         proc_create("maps", S_IRUGO, NULL, &proc_nommu_region_list_operations);
133         return 0;
134 }
135 
136 module_init(proc_nommu_init);
137 

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