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>

2 files changed, 6 insertions, 1 deletions

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 @@ out_check:
                         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 @@ again:
         }
         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;