[PATCH] sem2mutex: mm/slab.c

[safe/jmp/linux-2.6] / mm / memory.c

diff --git a/mm/memory.c b/mm/memory.c
index d8dde07..7a11ddd 100644 (file)
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1498,7 +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;
@@ -1770,9 +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;
+
+       mutex_lock(&inode->i_mutex);
+       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);
+       mutex_unlock(&inode->i_mutex);
+
+       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
@@ -1954,8 +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);
@@ -2086,7 +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);
@@ -2245,6 +2267,8 @@ int __handle_mm_fault(struct mm_struct *mm, struct vm_area_struct *vma,
        return handle_pte_fault(mm, vma, address, pte, pmd, write_access);
 }
 
+EXPORT_SYMBOL_GPL(__handle_mm_fault);
+
 #ifndef __PAGETABLE_PUD_FOLDED
 /*
  * Allocate page upper directory.