X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=mm%2Fmemory.c;h=cf6873e91c6a7eeb166031a7c8ae9fd4f3dda100;hb=a48f410a0a5a6c47cdfda35af49ea0e5aafb7745;hp=2032ad2fc34b82742ad273a4327394e76a5b187e;hpb=930861c4e6f13ce2e7d06cd1ef11441a065517d9;p=linux-2.6-omap-h63xx.git

diff --git a/mm/memory.c b/mm/memory.c
index 2032ad2fc34..cf6873e91c6 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1151,6 +1151,11 @@ struct page *follow_page(struct vm_area_struct *vma, unsigned long address,
 		if ((flags & FOLL_WRITE) &&
 		    !pte_dirty(pte) && !PageDirty(page))
 			set_page_dirty(page);
+		/*
+		 * pte_mkyoung() would be more correct here, but atomic care
+		 * is needed to avoid losing the dirty bit: it is easier to use
+		 * mark_page_accessed().
+		 */
 		mark_page_accessed(page);
 	}
 unlock:
@@ -1940,6 +1945,15 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		 * get_user_pages(.write=1, .force=1).
 		 */
 		if (vma->vm_ops && vma->vm_ops->page_mkwrite) {
+			struct vm_fault vmf;
+			int tmp;
+
+			vmf.virtual_address = (void __user *)(address &
+								PAGE_MASK);
+			vmf.pgoff = old_page->index;
+			vmf.flags = FAULT_FLAG_WRITE|FAULT_FLAG_MKWRITE;
+			vmf.page = old_page;
+
 			/*
 			 * Notify the address space that the page is about to
 			 * become writable so that it can prohibit this or wait
@@ -1951,8 +1965,12 @@ static int do_wp_page(struct mm_struct *mm, struct vm_area_struct *vma,
 			page_cache_get(old_page);
 			pte_unmap_unlock(page_table, ptl);
 
-			if (vma->vm_ops->page_mkwrite(vma, old_page) < 0)
+			tmp = vma->vm_ops->page_mkwrite(vma, &vmf);
+			if (unlikely(tmp &
+					(VM_FAULT_ERROR | VM_FAULT_NOPAGE))) {
+				ret = tmp;
 				goto unwritable_page;
+			}
 
 			/*
 			 * Since we dropped the lock we need to revalidate
@@ -2101,7 +2119,7 @@ oom:
 
 unwritable_page:
 	page_cache_release(old_page);
-	return VM_FAULT_SIGBUS;
+	return ret;
 }
 
 /*
@@ -2435,8 +2453,6 @@ static int do_swap_page(struct mm_struct *mm, struct vm_area_struct *vma,
 		count_vm_event(PGMAJFAULT);
 	}
 
-	mark_page_accessed(page);
-
 	lock_page(page);
 	delayacct_clear_flag(DELAYACCT_PF_SWAPIN);
 
@@ -2645,9 +2661,14 @@ static int __do_fault(struct mm_struct *mm, struct vm_area_struct *vma,
 			 * to become writable
 			 */
 			if (vma->vm_ops->page_mkwrite) {
+				int tmp;
+
 				unlock_page(page);
-				if (vma->vm_ops->page_mkwrite(vma, page) < 0) {
-					ret = VM_FAULT_SIGBUS;
+				vmf.flags |= FAULT_FLAG_MKWRITE;
+				tmp = vma->vm_ops->page_mkwrite(vma, &vmf);
+				if (unlikely(tmp &
+					  (VM_FAULT_ERROR | VM_FAULT_NOPAGE))) {
+					ret = tmp;
 					anon = 1; /* no anon but release vmf.page */
 					goto out_unlocked;
 				}