---

yaml
---
r: 308868
b: refs/heads/master
c: ec9516f
h: refs/heads/master
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 2f6e38f3cd17a7858112f538c1700c747170db1f
+refs/heads/master: ec9516fbc5fa814014991e1ae7f8860127122105

trunk/mm/shmem.c

@@ -1095,9 +1095,14 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index,
 		shmem_recalc_inode(inode);
 		spin_unlock(&info->lock);
 
-		clear_highpage(page);
-		flush_dcache_page(page);
-		SetPageUptodate(page);
+		/*
+		 * Let SGP_WRITE caller clear ends if write does not fill page
+		 */
+		if (sgp != SGP_WRITE) {
+			clear_highpage(page);
+			flush_dcache_page(page);
+			SetPageUptodate(page);
+		}
 		if (sgp == SGP_DIRTY)
 			set_page_dirty(page);
 	}
@@ -1307,6 +1312,14 @@ shmem_write_end(struct file *file, struct address_space *mapping,
 	if (pos + copied > inode->i_size)
 		i_size_write(inode, pos + copied);
 
+	if (!PageUptodate(page)) {
+		if (copied < PAGE_CACHE_SIZE) {
+			unsigned from = pos & (PAGE_CACHE_SIZE - 1);
+			zero_user_segments(page, 0, from,
+					from + copied, PAGE_CACHE_SIZE);
+		}
+		SetPageUptodate(page);
+	}
 	set_page_dirty(page);
 	unlock_page(page);
 	page_cache_release(page);
@@ -1768,6 +1781,7 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s
 		kaddr = kmap_atomic(page);
 		memcpy(kaddr, symname, len);
 		kunmap_atomic(kaddr);
+		SetPageUptodate(page);
 		set_page_dirty(page);
 		unlock_page(page);
 		page_cache_release(page);