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#include <linux/mm.h>
#include <linux/hugetlb.h>
#include <asm/uaccess.h>
char *task_mem(struct mm_struct *mm, char *buffer)
{
unsigned long data = 0, stack = 0, exec = 0, lib = 0;
struct vm_area_struct *vma;
down_read(&mm->mmap_sem);
for (vma = mm->mmap; vma; vma = vma->vm_next) {
unsigned long len = (vma->vm_end - vma->vm_start) >> 10;
if (!vma->vm_file) {
data += len;
if (vma->vm_flags & VM_GROWSDOWN)
stack += len;
continue;
}
if (vma->vm_flags & VM_WRITE)
continue;
if (vma->vm_flags & VM_EXEC) {
exec += len;
if (vma->vm_flags & VM_EXECUTABLE)
continue;
lib += len;
}
}
buffer += sprintf(buffer,
"VmSize:\t%8lu kB\n"
"VmLck:\t%8lu kB\n"
"VmRSS:\t%8lu kB\n"
"VmData:\t%8lu kB\n"
"VmStk:\t%8lu kB\n"
"VmExe:\t%8lu kB\n"
"VmLib:\t%8lu kB\n",
mm->total_vm << (PAGE_SHIFT-10),
mm->locked_vm << (PAGE_SHIFT-10),
mm->rss << (PAGE_SHIFT-10),
data - stack, stack,
exec - lib, lib);
up_read(&mm->mmap_sem);
return buffer;
}
unsigned long task_vsize(struct mm_struct *mm)
{
struct vm_area_struct *vma;
unsigned long vsize = 0;
for (vma = mm->mmap; vma; vma = vma->vm_next)
vsize += vma->vm_end - vma->vm_start;
return vsize;
}
int task_statm(struct mm_struct *mm, int *shared, int *text,
int *data, int *resident)
{
struct vm_area_struct *vma;
int size = 0;
*resident = mm->rss;
for (vma = mm->mmap; vma; vma = vma->vm_next) {
int pages = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
size += pages;
if (is_vm_hugetlb_page(vma)) {
if (!(vma->vm_flags & VM_DONTCOPY))
*shared += pages;
continue;
}
if (vma->vm_flags & VM_SHARED || !list_empty(&vma->shared))
*shared += pages;
if (vma->vm_flags & VM_EXECUTABLE)
*text += pages;
else
*data += pages;
}
return size;
}
/*
* The way we support synthetic files > 4K
* - without storing their contents in some buffer and
* - without walking through the entire synthetic file until we reach the
* position of the requested data
* is to cleverly encode the current position in the file's f_pos field.
* There is no requirement that a read() call which returns `count' bytes
* of data increases f_pos by exactly `count'.
*
* This idea is Linus' one. Bruno implemented it.
*/
/*
* For the /proc/<pid>/maps file, we use fixed length records, each containing
* a single line.
*
* f_pos = (number of the vma in the task->mm->mmap list) * PAGE_SIZE
* + (index into the line)
*/
/* for systems with sizeof(void*) == 4: */
#define MAPS_LINE_FORMAT4 "%08lx-%08lx %s %08lx %02x:%02x %lu"
#define MAPS_LINE_MAX4 49 /* sum of 8 1 8 1 4 1 8 1 5 1 10 1 */
/* for systems with sizeof(void*) == 8: */
#define MAPS_LINE_FORMAT8 "%016lx-%016lx %s %016lx %02x:%02x %lu"
#define MAPS_LINE_MAX8 73 /* sum of 16 1 16 1 4 1 16 1 5 1 10 1 */
#define MAPS_LINE_FORMAT (sizeof(void*) == 4 ? MAPS_LINE_FORMAT4 : MAPS_LINE_FORMAT8)
#define MAPS_LINE_MAX (sizeof(void*) == 4 ? MAPS_LINE_MAX4 : MAPS_LINE_MAX8)
static int proc_pid_maps_get_line (char *buf, struct vm_area_struct *map)
{
/* produce the next line */
char *line;
char str[5];
int flags;
dev_t dev;
unsigned long ino;
int len;
flags = map->vm_flags;
str[0] = flags & VM_READ ? 'r' : '-';
str[1] = flags & VM_WRITE ? 'w' : '-';
str[2] = flags & VM_EXEC ? 'x' : '-';
str[3] = flags & VM_MAYSHARE ? 's' : 'p';
str[4] = 0;
dev = 0;
ino = 0;
if (map->vm_file != NULL) {
struct inode *inode = map->vm_file->f_dentry->d_inode;
dev = inode->i_sb->s_dev;
ino = inode->i_ino;
line = d_path(map->vm_file->f_dentry,
map->vm_file->f_vfsmnt,
buf, PAGE_SIZE);
buf[PAGE_SIZE-1] = '\n';
line -= MAPS_LINE_MAX;
if(line < buf)
line = buf;
} else
line = buf;
len = sprintf(line,
MAPS_LINE_FORMAT,
map->vm_start, map->vm_end, str, map->vm_pgoff << PAGE_SHIFT,
MAJOR(dev), MINOR(dev), ino);
if(map->vm_file) {
int i;
for(i = len; i < MAPS_LINE_MAX; i++)
line[i] = ' ';
len = buf + PAGE_SIZE - line;
memmove(buf, line, len);
} else
line[len++] = '\n';
return len;
}
ssize_t proc_pid_read_maps(struct task_struct *task, struct file *file,
char *buf, size_t count, loff_t *ppos)
{
struct mm_struct *mm;
struct vm_area_struct * map;
char *tmp, *kbuf;
long retval;
int off, lineno, loff;
/* reject calls with out of range parameters immediately */
retval = 0;
if (*ppos > LONG_MAX)
goto out;
if (count == 0)
goto out;
off = (long)*ppos;
/*
* We might sleep getting the page, so get it first.
*/
retval = -ENOMEM;
kbuf = (char*)__get_free_page(GFP_KERNEL);
if (!kbuf)
goto out;
tmp = (char*)__get_free_page(GFP_KERNEL);
if (!tmp)
goto out_free1;
mm = get_task_mm(task);
retval = 0;
if (!mm)
goto out_free2;
down_read(&mm->mmap_sem);
map = mm->mmap;
lineno = 0;
loff = 0;
if (count > PAGE_SIZE)
count = PAGE_SIZE;
while (map) {
int len;
if (off > PAGE_SIZE) {
off -= PAGE_SIZE;
goto next;
}
len = proc_pid_maps_get_line(tmp, map);
len -= off;
if (len > 0) {
if (retval+len > count) {
/* only partial line transfer possible */
len = count - retval;
/* save the offset where the next read
* must start */
loff = len+off;
}
memcpy(kbuf+retval, tmp+off, len);
retval += len;
}
off = 0;
next:
if (!loff)
lineno++;
if (retval >= count)
break;
if (loff) BUG();
map = map->vm_next;
}
up_read(&mm->mmap_sem);
mmput(mm);
if (retval > count) BUG();
if (copy_to_user(buf, kbuf, retval))
retval = -EFAULT;
else
*ppos = (lineno << PAGE_SHIFT) + loff;
out_free2:
free_page((unsigned long)tmp);
out_free1:
free_page((unsigned long)kbuf);
out:
return retval;
}
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