[PATCH] x86/x86_64: mark rodata section read only: generic infrastructure

[pandora-kernel.git] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index d22f78c..7197f9b 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -574,7 +574,7 @@ int copy_page_range(struct mm_struct *dst_mm, struct mm_struct *src_mm,
         * readonly mappings. The tradeoff is that copy_page_range is more
         * efficient than faulting.
         */
-       if (!(vma->vm_flags & (VM_HUGETLB|VM_NONLINEAR|VM_PFNMAP))) {
+       if (!(vma->vm_flags & (VM_HUGETLB|VM_NONLINEAR|VM_PFNMAP|VM_INSERTPAGE))) {
                if (!vma->anon_vma)
                        return 0;
        }
@@ -1228,6 +1228,7 @@ int vm_insert_page(struct vm_area_struct *vma, unsigned long addr, struct page *
                return -EFAULT;
        if (!page_count(page))
                return -EINVAL;
+       vma->vm_flags |= VM_INSERTPAGE;
        return insert_page(vma->vm_mm, addr, page, vma->vm_page_prot);
 }
 EXPORT_SYMBOL(vm_insert_page);
@@ -1497,7 +1498,7 @@ gotten:
                update_mmu_cache(vma, address, entry);
                lazy_mmu_prot_update(entry);
                lru_cache_add_active(new_page);
-               page_add_anon_rmap(new_page, vma, address);
+               page_add_new_anon_rmap(new_page, vma, address);
 
                /* Free the old page.. */
                new_page = old_page;
@@ -1769,9 +1770,32 @@ out_big:
 out_busy:
        return -ETXTBSY;
 }
-
 EXPORT_SYMBOL(vmtruncate);
 
+int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end)
+{
+       struct address_space *mapping = inode->i_mapping;
+
+       /*
+        * If the underlying filesystem is not going to provide
+        * a way to truncate a range of blocks (punch a hole) -
+        * we should return failure right now.
+        */
+       if (!inode->i_op || !inode->i_op->truncate_range)
+               return -ENOSYS;
+
+       down(&inode->i_sem);
+       down_write(&inode->i_alloc_sem);
+       unmap_mapping_range(mapping, offset, (end - offset), 1);
+       truncate_inode_pages_range(mapping, offset, end);
+       inode->i_op->truncate_range(inode, offset, end);
+       up_write(&inode->i_alloc_sem);
+       up(&inode->i_sem);
+
+       return 0;
+}
+EXPORT_SYMBOL(vmtruncate_range);
+
 /* 
  * Primitive swap readahead code. We simply read an aligned block of
  * (1 << page_cluster) entries in the swap area. This method is chosen
@@ -1953,8 +1977,7 @@ static int do_anonymous_page(struct mm_struct *mm, struct vm_area_struct *vma,
                        goto release;
                inc_mm_counter(mm, anon_rss);
                lru_cache_add_active(page);
-               SetPageReferenced(page);
-               page_add_anon_rmap(page, vma, address);
+               page_add_new_anon_rmap(page, vma, address);
        } else {
                /* Map the ZERO_PAGE - vm_page_prot is readonly */
                page = ZERO_PAGE(address);
@@ -2085,7 +2108,7 @@ retry:
                if (anon) {
                        inc_mm_counter(mm, anon_rss);
                        lru_cache_add_active(new_page);
-                       page_add_anon_rmap(new_page, vma, address);
+                       page_add_new_anon_rmap(new_page, vma, address);
                } else {
                        inc_mm_counter(mm, file_rss);
                        page_add_file_rmap(new_page);