Add mkfs.btrfs -A offset to control allocation start on devices

This is a utility option for the resizer, it makes sure to allocate
at offset bytes in the disk or higher.  It ensures the resizer will have
something to move when testing it.

1 files changed, 1 insertions, 0 deletions

diff --git a/ctree.h b/ctree.h
index 8de46083..d2853448 100644
--- a/ctree.h
+++ b/ctree.h
@@ -501,6 +501,7 @@ struct btrfs_fs_info {
 	u64 data_alloc_profile;
 	u64 metadata_alloc_profile;
 	u64 system_alloc_profile;
+	u64 alloc_start;
 
 	struct btrfs_trans_handle *running_transaction;
 	struct btrfs_super_block super_copy;