The member log_root_transid is never used.
It's always kept untouched even when updating log tree root.
And populating it without introducing new incompat flags could easily
cause back-compatibility problems.
So just mark it unused.
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
changelog:
v2:
Remove the redundant comment.
---
fs/btrfs/ctree.h | 5 +----
1 file changed, 1 insertion(+), 4 deletions(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 53af9f5253f4..7adf5f4dcda4 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -214,8 +214,7 @@ struct btrfs_super_block {
__le64 chunk_root;
__le64 log_root;
- /* this will help find the new super based on the log root */
- __le64 log_root_transid;
+ __le64 __unused_log_root_transid;
__le64 total_bytes;
__le64 bytes_used;
__le64 root_dir_objectid;
@@ -2317,8 +2316,6 @@ BTRFS_SETGET_STACK_FUNCS(super_chunk_root_level, struct btrfs_super_block,
chunk_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(super_log_root, struct btrfs_super_block,
log_root, 64);
-BTRFS_SETGET_STACK_FUNCS(super_log_root_transid, struct btrfs_super_block,
- log_root_transid, 64);
BTRFS_SETGET_STACK_FUNCS(super_log_root_level, struct btrfs_super_block,
log_root_level, 8);
BTRFS_SETGET_STACK_FUNCS(super_total_bytes, struct btrfs_super_block,
--
2.19.1
