[PATCH 2/8] btrfs-progs: Export write_tree_block().

[Qu Wenruo <quwenruo@cn.fujitsu.com>]

Export wirte_tree_block() function and allow it write extent without
transaction.

This provides the basis for later uuid change function.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
---
 disk-io.c | 4 ++--
 disk-io.h | 3 +++
 2 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/disk-io.c b/disk-io.c
index 8a91345..4f3d1de 100644
--- a/disk-io.c
+++ b/disk-io.c
@@ -372,7 +372,7 @@ int write_and_map_eb(struct btrfs_trans_handle *trans,
 	return 0;
 }
 
-static int write_tree_block(struct btrfs_trans_handle *trans,
+int write_tree_block(struct btrfs_trans_handle *trans,
 		     struct btrfs_root *root,
 		     struct extent_buffer *eb)
 {
@@ -381,7 +381,7 @@ static int write_tree_block(struct btrfs_trans_handle *trans,
 		BUG();
 	}
 
-	if (!btrfs_buffer_uptodate(eb, trans->transid))
+	if (trans && !btrfs_buffer_uptodate(eb, trans->transid))
 		BUG();
 
 	btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
diff --git a/disk-io.h b/disk-io.h
index 83cbe47..dd5bb8a 100644
--- a/disk-io.h
+++ b/disk-io.h
@@ -127,6 +127,9 @@ int csum_tree_block_size(struct extent_buffer *buf, u16 csum_sectorsize,
 			 int verify);
 int verify_tree_block_csum_silent(struct extent_buffer *buf, u16 csum_size);
 int btrfs_read_buffer(struct extent_buffer *buf, u64 parent_transid);
+int write_tree_block(struct btrfs_trans_handle *trans,
+		     struct btrfs_root *root,
+		     struct extent_buffer *eb);
 int write_and_map_eb(struct btrfs_trans_handle *trans, struct btrfs_root *root,
 		     struct extent_buffer *eb);
 
-- 
2.3.7