---

yaml
---
r: 374879
b: refs/heads/master
c: 0abd5b1
h: refs/heads/master
i:
  374877: 9563354
  374875: 10795b2
  374871: 2f8db71
  374863: 664ad5e
  374847: 1ecfc74
v: v3

[refs]

@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3c59ccd32abb8f636b1573533d3e77972e80a9c9
+refs/heads/master: 0abd5b17249ea5ca49a3a9ad4285cac3dfa8c30b

trunk/fs/btrfs/ioctl.c

@@ -1154,8 +1154,11 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 	u64 new_align = ~((u64)128 * 1024 - 1);
 	struct page **pages = NULL;
 
-	if (extent_thresh == 0)
-		extent_thresh = 256 * 1024;
+	if (isize == 0)
+		return 0;
+
+	if (range->start >= isize)
+		return -EINVAL;
 
 	if (range->flags & BTRFS_DEFRAG_RANGE_COMPRESS) {
 		if (range->compress_type > BTRFS_COMPRESS_TYPES)
@@ -1164,8 +1167,8 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
 			compress_type = range->compress_type;
 	}
 
-	if (isize == 0)
-		return 0;
+	if (extent_thresh == 0)
+		extent_thresh = 256 * 1024;
 
 	/*
 	 * if we were not given a file, allocate a readahead