From ba31d3a4a48ca96517db50cdfa7d71b7721c5b55 Mon Sep 17 00:00:00 2001
From: Luke Shumaker <lukeshu@lukeshu.com>
Date: Sun, 5 Jun 2022 10:02:35 -0600
Subject: more

---
 cmd/btrfs-dump-tree/main.go            | 5 +++--
 pkg/btrfs/btrfsitem/item_blockgroup.go | 9 +++++++++
 pkg/btrfs/btrfsitem/items.txt          | 1 +
 pkg/btrfs/btrfsitem/items_gen.go       | 3 +++
 pkg/btrfs/internal/itemtype.go         | 2 ++
 5 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/cmd/btrfs-dump-tree/main.go b/cmd/btrfs-dump-tree/main.go
index 6a8a7e6..52ee441 100644
--- a/cmd/btrfs-dump-tree/main.go
+++ b/cmd/btrfs-dump-tree/main.go
@@ -227,8 +227,9 @@ func printTree(fs *btrfs.FS, root btrfs.LogicalAddr) error {
 			//	// TODO
 			//case btrfsitem.EXTENT_DATA_KEY:
 			//	// TODO
-			//case btrfsitem.BLOCK_GROUP_ITEM_KEY:
-			//	// TODO
+			case btrfsitem.BlockGroup:
+				fmt.Printf("\t\tblock group used %d chunk_objectid %d flags %v\n",
+					body.Used, body.ChunkObjectID, body.Flags)
 			//case btrfsitem.FREE_SPACE_INFO_KEY:
 			//	// TODO
 			//case btrfsitem.FREE_SPACE_EXTENT_KEY:
diff --git a/pkg/btrfs/btrfsitem/item_blockgroup.go b/pkg/btrfs/btrfsitem/item_blockgroup.go
index 162adb1..565aae8 100644
--- a/pkg/btrfs/btrfsitem/item_blockgroup.go
+++ b/pkg/btrfs/btrfsitem/item_blockgroup.go
@@ -1,9 +1,18 @@
 package btrfsitem
 
 import (
+	"lukeshu.com/btrfs-tools/pkg/binstruct"
+	"lukeshu.com/btrfs-tools/pkg/btrfs/internal"
 	"lukeshu.com/btrfs-tools/pkg/util"
 )
 
+type BlockGroup struct { // BLOCK_GROUP_ITEM=192
+	Used          int64           `bin:"off=0, siz=8"`
+	ChunkObjectID internal.ObjID  `bin:"off=8, siz=8"`
+	Flags         BlockGroupFlags `bin:"off=16, siz=8"`
+	binstruct.End `bin:"off=24"`
+}
+
 type BlockGroupFlags uint64
 
 const (
diff --git a/pkg/btrfs/btrfsitem/items.txt b/pkg/btrfs/btrfsitem/items.txt
index 0cca6df..5e9a17d 100644
--- a/pkg/btrfs/btrfsitem/items.txt
+++ b/pkg/btrfs/btrfsitem/items.txt
@@ -1,3 +1,4 @@
+BLOCK_GROUP_ITEM=192 BlockGroup
 CHUNK_ITEM=228 Chunk
 DEV_ITEM=216 Dev
 DEV_EXTENT=204 DevExtent
diff --git a/pkg/btrfs/btrfsitem/items_gen.go b/pkg/btrfs/btrfsitem/items_gen.go
index fc894d1..8c51875 100644
--- a/pkg/btrfs/btrfsitem/items_gen.go
+++ b/pkg/btrfs/btrfsitem/items_gen.go
@@ -9,6 +9,7 @@ import (
 )
 
 const (
+	BLOCK_GROUP_ITEM_KEY     = internal.BLOCK_GROUP_ITEM_KEY
 	CHUNK_ITEM_KEY           = internal.CHUNK_ITEM_KEY
 	DEV_ITEM_KEY             = internal.DEV_ITEM_KEY
 	DEV_EXTENT_KEY           = internal.DEV_EXTENT_KEY
@@ -33,6 +34,7 @@ const (
 )
 
 var keytype2gotype = map[Type]reflect.Type{
+	BLOCK_GROUP_ITEM_KEY:     reflect.TypeOf(BlockGroup{}),
 	CHUNK_ITEM_KEY:           reflect.TypeOf(Chunk{}),
 	DEV_ITEM_KEY:             reflect.TypeOf(Dev{}),
 	DEV_EXTENT_KEY:           reflect.TypeOf(DevExtent{}),
@@ -56,6 +58,7 @@ var keytype2gotype = map[Type]reflect.Type{
 	UUID_RECEIVED_SUBVOL_KEY: reflect.TypeOf(UUIDMap{}),
 }
 
+func (BlockGroup) isItem()    {}
 func (Chunk) isItem()         {}
 func (Dev) isItem()           {}
 func (DevExtent) isItem()     {}
diff --git a/pkg/btrfs/internal/itemtype.go b/pkg/btrfs/internal/itemtype.go
index 5a8c10f..7f16889 100644
--- a/pkg/btrfs/internal/itemtype.go
+++ b/pkg/btrfs/internal/itemtype.go
@@ -7,6 +7,7 @@ import "fmt"
 type ItemType uint8
 
 const (
+	BLOCK_GROUP_ITEM_KEY     = ItemType(192)
 	CHUNK_ITEM_KEY           = ItemType(228)
 	DEV_ITEM_KEY             = ItemType(216)
 	DEV_EXTENT_KEY           = ItemType(204)
@@ -32,6 +33,7 @@ const (
 
 func (t ItemType) String() string {
 	names := map[ItemType]string{
+		BLOCK_GROUP_ITEM_KEY:     "BLOCK_GROUP_ITEM",
 		CHUNK_ITEM_KEY:           "CHUNK_ITEM",
 		DEV_ITEM_KEY:             "DEV_ITEM",
 		DEV_EXTENT_KEY:           "DEV_EXTENT",
-- 
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