fs/proc/task_mmu.c

   1 #include <linux/mm.h>
   2 #include <linux/hugetlb.h>
   3 #include <linux/mount.h>
   4 #include <linux/seq_file.h>
   5 #include <asm/elf.h>
   6 #include <asm/uaccess.h>
   7 #include "internal.h"
   8
   9 char *task_mem(struct mm_struct *mm, char *buffer)
  10 {
  11         unsigned long data, text, lib;
  12
  13         data = mm->total_vm - mm->shared_vm - mm->stack_vm;
  14         text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) >> 10;
  15         lib = (mm->exec_vm << (PAGE_SHIFT-10)) - text;
  16         buffer += sprintf(buffer,
  17                 "VmSize:\t%8lu kB\n"
  18                 "VmLck:\t%8lu kB\n"
  19                 "VmRSS:\t%8lu kB\n"
  20                 "VmData:\t%8lu kB\n"
  21                 "VmStk:\t%8lu kB\n"
  22                 "VmExe:\t%8lu kB\n"
  23                 "VmLib:\t%8lu kB\n"
  24                 "VmPTE:\t%8lu kB\n",
  25                 (mm->total_vm - mm->reserved_vm) << (PAGE_SHIFT-10),
  26                 mm->locked_vm << (PAGE_SHIFT-10),
  27                 get_mm_counter(mm, rss) << (PAGE_SHIFT-10),
  28                 data << (PAGE_SHIFT-10),
  29                 mm->stack_vm << (PAGE_SHIFT-10), text, lib,
  30                 (PTRS_PER_PTE*sizeof(pte_t)*mm->nr_ptes) >> 10);
  31         return buffer;
  32 }
  33
  34 unsigned long task_vsize(struct mm_struct *mm)
  35 {
  36         return PAGE_SIZE * mm->total_vm;
  37 }
  38
  39 int task_statm(struct mm_struct *mm, int *shared, int *text,
  40                int *data, int *resident)
  41 {
  42         int rss = get_mm_counter(mm, rss);
  43
  44         *shared = rss - get_mm_counter(mm, anon_rss);
  45         *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK))
  46                                                                 >> PAGE_SHIFT;
  47         *data = mm->total_vm - mm->shared_vm;
  48         *resident = rss;
  49         return mm->total_vm;
  50 }
  51
  52 int proc_exe_link(struct inode *inode, struct dentry **dentry, struct vfsmount **mnt)
  53 {
  54         struct vm_area_struct * vma;
  55         int result = -ENOENT;
  56         struct task_struct *task = proc_task(inode);
  57         struct mm_struct * mm = get_task_mm(task);
  58
  59         if (!mm)
  60                 goto out;
  61         down_read(&mm->mmap_sem);
  62
  63         vma = mm->mmap;
  64         while (vma) {
  65                 if ((vma->vm_flags & VM_EXECUTABLE) && vma->vm_file)
  66                         break;
  67                 vma = vma->vm_next;
  68         }
  69
  70         if (vma) {
  71                 *mnt = mntget(vma->vm_file->f_vfsmnt);
  72                 *dentry = dget(vma->vm_file->f_dentry);
  73                 result = 0;
  74         }
  75
  76         up_read(&mm->mmap_sem);
  77         mmput(mm);
  78 out:
  79         return result;
  80 }
  81
  82 static void pad_len_spaces(struct seq_file *m, int len)
  83 {
  84         len = 25 + sizeof(void*) * 6 - len;
  85         if (len < 1)
  86                 len = 1;
  87         seq_printf(m, "%*c", len, ' ');
  88 }
  89
  90 static int show_map(struct seq_file *m, void *v)
  91 {
  92         struct task_struct *task = m->private;
  93         struct vm_area_struct *map = v;
  94         struct mm_struct *mm = map->vm_mm;
  95         struct file *file = map->vm_file;
  96         int flags = map->vm_flags;
  97         unsigned long ino = 0;
  98         dev_t dev = 0;
  99         int len;
 100
 101         if (file) {
 102                 struct inode *inode = map->vm_file->f_dentry->d_inode;
 103                 dev = inode->i_sb->s_dev;
 104                 ino = inode->i_ino;
 105         }
 106
 107         seq_printf(m, "%08lx-%08lx %c%c%c%c %08lx %02x:%02x %lu %n",
 108                         map->vm_start,
 109                         map->vm_end,
 110                         flags & VM_READ ? 'r' : '-',
 111                         flags & VM_WRITE ? 'w' : '-',
 112                         flags & VM_EXEC ? 'x' : '-',
 113                         flags & VM_MAYSHARE ? 's' : 'p',
 114                         map->vm_pgoff << PAGE_SHIFT,
 115                         MAJOR(dev), MINOR(dev), ino, &len);
 116
 117         /*
 118          * Print the dentry name for named mappings, and a
 119          * special [heap] marker for the heap:
 120          */
 121         if (map->vm_file) {
 122                 pad_len_spaces(m, len);
 123                 seq_path(m, file->f_vfsmnt, file->f_dentry, "");
 124         } else {
 125                 if (mm) {
 126                         if (map->vm_start <= mm->start_brk &&
 127                                                 map->vm_end >= mm->brk) {
 128                                 pad_len_spaces(m, len);
 129                                 seq_puts(m, "[heap]");
 130                         } else {
 131                                 if (map->vm_start <= mm->start_stack &&
 132                                         map->vm_end >= mm->start_stack) {
 133
 134                                         pad_len_spaces(m, len);
 135                                         seq_puts(m, "[stack]");
 136                                 }
 137                         }
 138                 } else {
 139                         pad_len_spaces(m, len);
 140                         seq_puts(m, "[vdso]");
 141                 }
 142         }
 143         seq_putc(m, '\n');
 144         if (m->count < m->size)  /* map is copied successfully */
 145                 m->version = (map != get_gate_vma(task))? map->vm_start: 0;
 146         return 0;
 147 }
 148
 149 static void *m_start(struct seq_file *m, loff_t *pos)
 150 {
 151         struct task_struct *task = m->private;
 152         unsigned long last_addr = m->version;
 153         struct mm_struct *mm;
 154         struct vm_area_struct *map, *tail_map;
 155         loff_t l = *pos;
 156
 157         /*
 158          * We remember last_addr rather than next_addr to hit with
 159          * mmap_cache most of the time. We have zero last_addr at
 160          * the begining and also after lseek. We will have -1 last_addr
 161          * after the end of the maps.
 162          */
 163
 164         if (last_addr == -1UL)
 165                 return NULL;
 166
 167         mm = get_task_mm(task);
 168         if (!mm)
 169                 return NULL;
 170
 171         tail_map = get_gate_vma(task);
 172         down_read(&mm->mmap_sem);
 173
 174         /* Start with last addr hint */
 175         if (last_addr && (map = find_vma(mm, last_addr))) {
 176                 map = map->vm_next;
 177                 goto out;
 178         }
 179
 180         /*
 181          * Check the map index is within the range and do
 182          * sequential scan until m_index.
 183          */
 184         map = NULL;
 185         if ((unsigned long)l < mm->map_count) {
 186                 map = mm->mmap;
 187                 while (l-- && map)
 188                         map = map->vm_next;
 189                 goto out;
 190         }
 191
 192         if (l != mm->map_count)
 193                 tail_map = NULL; /* After gate map */
 194
 195 out:
 196         if (map)
 197                 return map;
 198
 199         /* End of maps has reached */
 200         m->version = (tail_map != NULL)? 0: -1UL;
 201         up_read(&mm->mmap_sem);
 202         mmput(mm);
 203         return tail_map;
 204 }
 205
 206 static void m_stop(struct seq_file *m, void *v)
 207 {
 208         struct task_struct *task = m->private;
 209         struct vm_area_struct *map = v;
 210         if (map && map != get_gate_vma(task)) {
 211                 struct mm_struct *mm = map->vm_mm;
 212                 up_read(&mm->mmap_sem);
 213                 mmput(mm);
 214         }
 215 }
 216
 217 static void *m_next(struct seq_file *m, void *v, loff_t *pos)
 218 {
 219         struct task_struct *task = m->private;
 220         struct vm_area_struct *map = v;
 221         struct vm_area_struct *tail_map = get_gate_vma(task);
 222
 223         (*pos)++;
 224         if (map && (map != tail_map) && map->vm_next)
 225                 return map->vm_next;
 226         m_stop(m, v);
 227         return (map != tail_map)? tail_map: NULL;
 228 }
 229
 230 struct seq_operations proc_pid_maps_op = {
 231         .start  = m_start,
 232         .next   = m_next,
 233         .stop   = m_stop,
 234         .show   = show_map
 235 };