From d722b36e2032c0afba0f7ffda7e3ffc80b12a619 Mon Sep 17 00:00:00 2001
From: Liu Bo <bo.li.liu@oracle.com>
Date: Tue, 16 Apr 2013 09:20:28 +0000
Subject: [PATCH] --- yaml --- r: 374879 b: refs/heads/master c:
 0abd5b17249ea5ca49a3a9ad4285cac3dfa8c30b h: refs/heads/master i:   374877:
 95633547051e921a6afd22434e4afdb8c3873560   374875:
 10795b21141113c89555faa5cc7dbe7a36977ba1   374871:
 2f8db719f35977882897cbf7ebaeefeff1be2bb3   374863:
 664ad5eb18698a15b0304895005f4d5a81fe1ade   374847:
 1ecfc74d25e60116af4c605fa7f04ff3b9d69d8b v: v3

---
 [refs]                 |  2 +-
 trunk/fs/btrfs/ioctl.c | 11 +++++++----
 2 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/[refs] b/[refs]
index 826977d674de..5d32ff1acbe5 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 3c59ccd32abb8f636b1573533d3e77972e80a9c9
+refs/heads/master: 0abd5b17249ea5ca49a3a9ad4285cac3dfa8c30b
diff --git a/trunk/fs/btrfs/ioctl.c b/trunk/fs/btrfs/ioctl.c
index ace88c1df540..a74edc797531 100644
--- a/trunk/fs/btrfs/ioctl.c
+++ b/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