Btrfs: keep track of the extents original block length
If we've written to a prealloc extent we need to know the original block len
for the extent. We can't figure this out currently since ->block_len is
just set to the extent length. So introduce ->orig_block_len so that we
know how many bytes were in the original extent for proper extent logging
that future patches will need. Thanks,
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>
diff --git a/fs/btrfs/extent_map.h b/fs/btrfs/extent_map.h
index 6792255..99a0dcb 100644
--- a/fs/btrfs/extent_map.h
+++ b/fs/btrfs/extent_map.h
@@ -24,6 +24,7 @@
u64 mod_start;
u64 mod_len;
u64 orig_start;
+ u64 orig_block_len;
u64 block_start;
u64 block_len;
u64 generation;
