From 445a69449994a37615cd47e47bcab2e42a070adf Mon Sep 17 00:00:00 2001
From: Chris Mason <chris.mason@oracle.com>
Date: Mon, 10 Nov 2008 11:53:33 -0500
Subject: [PATCH] Btrfs: Fix usage of struct extent_map->orig_start

This makes sure the orig_start field in struct extent_map gets set
everywhere the extent_map structs are created or modified.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
---
 fs/btrfs/file.c  | 3 ++-
 fs/btrfs/inode.c | 4 ++++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c
index 85841c538805..4119f9a95320 100644
--- a/fs/btrfs/file.c
+++ b/fs/btrfs/file.c
@@ -244,16 +244,17 @@ int btrfs_drop_extent_cache(struct inode *inode, u64 start, u64 end,
 
 			split->start = start + len;
 			split->len = em->start + em->len - (start + len);
-			split->orig_start = em->orig_start;
 			split->bdev = em->bdev;
 			split->flags = flags;
 
 			if (compressed) {
 				split->block_len = em->block_len;
 				split->block_start = em->block_start;
+				split->orig_start = em->orig_start;
 			} else {
 				split->block_len = split->len;
 				split->block_start = em->block_start + diff;
+				split->orig_start = split->start;
 			}
 
 			ret = add_extent_mapping(em_tree, split);
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 59660293d291..5ca9c0672374 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -610,6 +610,7 @@ static noinline int submit_compressed_extents(struct inode *inode,
 		em = alloc_extent_map(GFP_NOFS);
 		em->start = async_extent->start;
 		em->len = async_extent->ram_size;
+		em->orig_start = em->start;
 
 		em->block_start = ins.objectid;
 		em->block_len = ins.offset;
@@ -743,6 +744,7 @@ static noinline int cow_file_range(struct inode *inode,
 		}
 		em = alloc_extent_map(GFP_NOFS);
 		em->start = start;
+		em->orig_start = em->start;
 
 		ram_size = ins.offset;
 		em->len = ins.offset;
@@ -1057,6 +1059,7 @@ static int run_delalloc_nocow(struct inode *inode, struct page *locked_page,
 			em_tree = &BTRFS_I(inode)->extent_tree;
 			em = alloc_extent_map(GFP_NOFS);
 			em->start = cur_offset;
+			em->orig_start = em->start;
 			em->len = num_bytes;
 			em->block_len = num_bytes;
 			em->block_start = disk_bytenr;
@@ -3876,6 +3879,7 @@ struct extent_map *btrfs_get_extent(struct inode *inode, struct page *page,
 	}
 	em->bdev = root->fs_info->fs_devices->latest_bdev;
 	em->start = EXTENT_MAP_HOLE;
+	em->orig_start = EXTENT_MAP_HOLE;
 	em->len = (u64)-1;
 	em->block_len = (u64)-1;