From e1e98f06df0e4f08b6f1b32aa68bd6cf428560aa Mon Sep 17 00:00:00 2001
From: Josef Bacik <josef@redhat.com>
Date: Fri, 4 Mar 2011 15:46:53 -0500
Subject: [PATCH] --- yaml --- r: 243151 b: refs/heads/master c:
 695a0d0da09e75c4475bbb303def159023ef72ca h: refs/heads/master i:   243149:
 3e5bf18e9a2e15ca955dbe870e611ff71b4c2e87   243147:
 8f6c8d460ee47f3d58614231152d11e0d683827a   243143:
 5c5fa7bc6c46a7dfe625e775ad456fc42b54163c   243135:
 3134de014e97d735d12f1fc4cb0017d5868b1bef v: v3

---
 [refs]                 | 2 +-
 trunk/fs/btrfs/inode.c | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/[refs] b/[refs]
index 5a956e6182ed..874919ab5f21 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: 930f028abe39dfd0849b53131d19c4b67aacbe67
+refs/heads/master: 695a0d0da09e75c4475bbb303def159023ef72ca
diff --git a/trunk/fs/btrfs/inode.c b/trunk/fs/btrfs/inode.c
index 64d57e032b4e..888dbdb3b128 100644
--- a/trunk/fs/btrfs/inode.c
+++ b/trunk/fs/btrfs/inode.c
@@ -3557,6 +3557,12 @@ static int btrfs_truncate_page(struct address_space *mapping, loff_t from)
 	return ret;
 }
 
+/*
+ * This function puts in dummy file extents for the area we're creating a hole
+ * for.  So if we are truncating this file to a larger size we need to insert
+ * these file extents so that btrfs_get_extent will return a EXTENT_MAP_HOLE for
+ * the range between oldsize and size
+ */
 int btrfs_cont_expand(struct inode *inode, loff_t oldsize, loff_t size)
 {
 	struct btrfs_trans_handle *trans;