btrfs: add code to support the block group root

[sfrench/cifs-2.6.git] / fs / btrfs / ctree.h

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 54424b34113237c7e6df0f106f5d13013ce82805..f460a7bb9ae8f860f867217ad1c0886a7ab8022a 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -274,8 +274,14 @@ struct btrfs_super_block {
        /* the UUID written into btree blocks */
        u8 metadata_uuid[BTRFS_FSID_SIZE];
 
+       /* Extent tree v2 */
+       __le64 block_group_root;
+       __le64 block_group_root_generation;
+       u8 block_group_root_level;
+
        /* future expansion */
-       __le64 reserved[28];
+       u8 reserved8[7];
+       __le64 reserved[25];
        u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
        struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
 
@@ -657,6 +663,7 @@ struct btrfs_fs_info {
        struct btrfs_root *quota_root;
        struct btrfs_root *uuid_root;
        struct btrfs_root *data_reloc_root;
+       struct btrfs_root *block_group_root;
 
        /* the log root tree is a directory of all the other log roots */
        struct btrfs_root *log_root_tree;
@@ -2349,6 +2356,17 @@ BTRFS_SETGET_STACK_FUNCS(backup_bytes_used, struct btrfs_root_backup,
 BTRFS_SETGET_STACK_FUNCS(backup_num_devices, struct btrfs_root_backup,
                   num_devices, 64);
 
+/*
+ * For extent tree v2 we overload the extent root with the block group root, as
+ * we will have multiple extent roots.
+ */
+BTRFS_SETGET_STACK_FUNCS(backup_block_group_root, struct btrfs_root_backup,
+                        extent_root, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_gen, struct btrfs_root_backup,
+                        extent_root_gen, 64);
+BTRFS_SETGET_STACK_FUNCS(backup_block_group_root_level,
+                        struct btrfs_root_backup, extent_root_level, 8);
+
 /* struct btrfs_balance_item */
 BTRFS_SETGET_FUNCS(balance_flags, struct btrfs_balance_item, flags, 64);
 
@@ -2483,6 +2501,13 @@ BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
 BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
 BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
                         uuid_tree_generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_block_group_root, struct btrfs_super_block,
+                        block_group_root, 64);
+BTRFS_SETGET_STACK_FUNCS(super_block_group_root_generation,
+                        struct btrfs_super_block,
+                        block_group_root_generation, 64);
+BTRFS_SETGET_STACK_FUNCS(super_block_group_root_level, struct btrfs_super_block,
+                        block_group_root_level, 8);
 
 int btrfs_super_csum_size(const struct btrfs_super_block *s);
 const char *btrfs_super_csum_name(u16 csum_type);