maps4: move clear_refs code to task_mmu.c

[deliverable/linux.git] / fs / proc / task_mmu.c

diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 791b2d400be52b9672454422c546816b79312c5c..fcdbd233f25233670a23acf1c1a9781740dec5fa 100644 (file)
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -145,7 +145,7 @@ struct mem_size_stats
        u64 pss;
 };
 
-static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats *mss)
+static int show_map(struct seq_file *m, void *v)
 {
        struct proc_maps_private *priv = m->private;
        struct task_struct *task = priv->task;
@@ -205,35 +205,11 @@ static int show_map_internal(struct seq_file *m, void *v, struct mem_size_stats
        }
        seq_putc(m, '\n');
 
-       if (mss)
-               seq_printf(m,
-                          "Size:           %8lu kB\n"
-                          "Rss:            %8lu kB\n"
-                          "Pss:            %8lu kB\n"
-                          "Shared_Clean:   %8lu kB\n"
-                          "Shared_Dirty:   %8lu kB\n"
-                          "Private_Clean:  %8lu kB\n"
-                          "Private_Dirty:  %8lu kB\n"
-                          "Referenced:     %8lu kB\n",
-                          (vma->vm_end - vma->vm_start) >> 10,
-                          mss->resident >> 10,
-                          (unsigned long)(mss->pss >> (10 + PSS_SHIFT)),
-                          mss->shared_clean  >> 10,
-                          mss->shared_dirty  >> 10,
-                          mss->private_clean >> 10,
-                          mss->private_dirty >> 10,
-                          mss->referenced >> 10);
-
        if (m->count < m->size)  /* vma is copied successfully */
                m->version = (vma != get_gate_vma(task))? vma->vm_start: 0;
        return 0;
 }
 
-static int show_map(struct seq_file *m, void *v)
-{
-       return show_map_internal(m, v, NULL);
-}
-
 static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
                           void *private)
 {
@@ -312,30 +288,82 @@ static int show_smap(struct seq_file *m, void *v)
 {
        struct vm_area_struct *vma = v;
        struct mem_size_stats mss;
+       int ret;
 
        memset(&mss, 0, sizeof mss);
        mss.vma = vma;
        if (vma->vm_mm && !is_vm_hugetlb_page(vma))
                walk_page_range(vma->vm_mm, vma->vm_start, vma->vm_end,
                                &smaps_walk, &mss);
-       return show_map_internal(m, v, &mss);
+
+       ret = show_map(m, v);
+       if (ret)
+               return ret;
+
+       seq_printf(m,
+                  "Size:           %8lu kB\n"
+                  "Rss:            %8lu kB\n"
+                  "Pss:            %8lu kB\n"
+                  "Shared_Clean:   %8lu kB\n"
+                  "Shared_Dirty:   %8lu kB\n"
+                  "Private_Clean:  %8lu kB\n"
+                  "Private_Dirty:  %8lu kB\n"
+                  "Referenced:     %8lu kB\n",
+                  (vma->vm_end - vma->vm_start) >> 10,
+                  mss.resident >> 10,
+                  (unsigned long)(mss.pss >> (10 + PSS_SHIFT)),
+                  mss.shared_clean  >> 10,
+                  mss.shared_dirty  >> 10,
+                  mss.private_clean >> 10,
+                  mss.private_dirty >> 10,
+                  mss.referenced >> 10);
+
+       return ret;
 }
 
 static struct mm_walk clear_refs_walk = { .pmd_entry = clear_refs_pte_range };
 
-void clear_refs_smap(struct mm_struct *mm)
+static ssize_t clear_refs_write(struct file *file, const char __user *buf,
+                               size_t count, loff_t *ppos)
 {
+       struct task_struct *task;
+       char buffer[PROC_NUMBUF], *end;
+       struct mm_struct *mm;
        struct vm_area_struct *vma;
 
-       down_read(&mm->mmap_sem);
-       for (vma = mm->mmap; vma; vma = vma->vm_next)
-               if (vma->vm_mm && !is_vm_hugetlb_page(vma))
-                       walk_page_range(vma->vm_mm, vma->vm_start, vma->vm_end,
-                                       &clear_refs_walk, vma);
-       flush_tlb_mm(mm);
-       up_read(&mm->mmap_sem);
+       memset(buffer, 0, sizeof(buffer));
+       if (count > sizeof(buffer) - 1)
+               count = sizeof(buffer) - 1;
+       if (copy_from_user(buffer, buf, count))
+               return -EFAULT;
+       if (!simple_strtol(buffer, &end, 0))
+               return -EINVAL;
+       if (*end == '\n')
+               end++;
+       task = get_proc_task(file->f_path.dentry->d_inode);
+       if (!task)
+               return -ESRCH;
+       mm = get_task_mm(task);
+       if (mm) {
+               down_read(&mm->mmap_sem);
+               for (vma = mm->mmap; vma; vma = vma->vm_next)
+                       if (!is_vm_hugetlb_page(vma))
+                               walk_page_range(mm, vma->vm_start, vma->vm_end,
+                                               &clear_refs_walk, vma);
+               flush_tlb_mm(mm);
+               up_read(&mm->mmap_sem);
+               mmput(mm);
+       }
+       put_task_struct(task);
+       if (end - buffer == 0)
+               return -EIO;
+       return end - buffer;
 }
 
+const struct file_operations proc_clear_refs_operations = {
+       .write          = clear_refs_write,
+};
+
 static void *m_start(struct seq_file *m, loff_t *pos)
 {
        struct proc_maps_private *priv = m->private;