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authorMatt Mackall <mpm@selenic.com>2008-02-05 07:29:03 +0100
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2008-02-05 18:44:16 +0100
commitf248dcb34d7b7ac255db70071a20be9d9c6ad491 (patch)
treeec7c7fb115e40b4a337af98a6f9f2ad5db9af1f0 /fs/proc/task_mmu.c
parentmaps4: simplify interdependence of maps and smaps (diff)
downloadlinux-f248dcb34d7b7ac255db70071a20be9d9c6ad491.tar.xz
linux-f248dcb34d7b7ac255db70071a20be9d9c6ad491.zip
maps4: move clear_refs code to task_mmu.c
This puts all the clear_refs code where it belongs and probably lets things compile on MMU-less systems as well. Signed-off-by: Matt Mackall <mpm@selenic.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: David Rientjes <rientjes@google.com> Cc: Dave Hansen <haveblue@us.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/task_mmu.c')
-rw-r--r--fs/proc/task_mmu.c44
1 files changed, 36 insertions, 8 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index abc44f39f1d6..fcdbd233f252 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -323,19 +323,47 @@ static int show_smap(struct seq_file *m, void *v)
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;