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-rw-r--r--fs/btrfs/ctree.h27
-rw-r--r--fs/btrfs/disk-io.c49
-rw-r--r--fs/btrfs/disk-io.h2
-rw-r--r--fs/btrfs/print-tree.c1
4 files changed, 71 insertions, 8 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 54424b341132..f460a7bb9ae8 100644
--- 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);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e014cb8413c7..fe1349737edb 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1727,6 +1727,7 @@ void btrfs_free_fs_info(struct btrfs_fs_info *fs_info)
btrfs_put_root(fs_info->uuid_root);
btrfs_put_root(fs_info->fs_root);
btrfs_put_root(fs_info->data_reloc_root);
+ btrfs_put_root(fs_info->block_group_root);
btrfs_check_leaked_roots(fs_info);
btrfs_extent_buffer_leak_debug_check(fs_info);
kfree(fs_info->super_copy);
@@ -2095,7 +2096,6 @@ static void backup_super_roots(struct btrfs_fs_info *info)
{
const int next_backup = info->backup_root_index;
struct btrfs_root_backup *root_backup;
- struct btrfs_root *extent_root = btrfs_extent_root(info, 0);
struct btrfs_root *csum_root = btrfs_csum_root(info, 0);
root_backup = info->super_for_commit->super_roots + next_backup;
@@ -2121,11 +2121,23 @@ static void backup_super_roots(struct btrfs_fs_info *info)
btrfs_set_backup_chunk_root_level(root_backup,
btrfs_header_level(info->chunk_root->node));
- btrfs_set_backup_extent_root(root_backup, extent_root->node->start);
- btrfs_set_backup_extent_root_gen(root_backup,
- btrfs_header_generation(extent_root->node));
- btrfs_set_backup_extent_root_level(root_backup,
- btrfs_header_level(extent_root->node));
+ if (btrfs_fs_incompat(info, EXTENT_TREE_V2)) {
+ btrfs_set_backup_block_group_root(root_backup,
+ info->block_group_root->node->start);
+ btrfs_set_backup_block_group_root_gen(root_backup,
+ btrfs_header_generation(info->block_group_root->node));
+ btrfs_set_backup_block_group_root_level(root_backup,
+ btrfs_header_level(info->block_group_root->node));
+ } else {
+ struct btrfs_root *extent_root = btrfs_extent_root(info, 0);
+
+ btrfs_set_backup_extent_root(root_backup,
+ extent_root->node->start);
+ btrfs_set_backup_extent_root_gen(root_backup,
+ btrfs_header_generation(extent_root->node));
+ btrfs_set_backup_extent_root_level(root_backup,
+ btrfs_header_level(extent_root->node));
+ }
/*
* we might commit during log recovery, which happens before we set
@@ -2269,6 +2281,7 @@ static void free_root_pointers(struct btrfs_fs_info *info, bool free_chunk_root)
free_root_extent_buffers(info->uuid_root);
free_root_extent_buffers(info->fs_root);
free_root_extent_buffers(info->data_reloc_root);
+ free_root_extent_buffers(info->block_group_root);
if (free_chunk_root)
free_root_extent_buffers(info->chunk_root);
}
@@ -2964,8 +2977,20 @@ static int load_important_roots(struct btrfs_fs_info *fs_info)
gen = btrfs_super_generation(sb);
level = btrfs_super_root_level(sb);
ret = load_super_root(fs_info->tree_root, bytenr, gen, level);
- if (ret)
+ if (ret) {
btrfs_warn(fs_info, "couldn't read tree root");
+ return ret;
+ }
+
+ if (!btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
+ return 0;
+
+ bytenr = btrfs_super_block_group_root(sb);
+ gen = btrfs_super_block_group_root_generation(sb);
+ level = btrfs_super_block_group_root_level(sb);
+ ret = load_super_root(fs_info->block_group_root, bytenr, gen, level);
+ if (ret)
+ btrfs_warn(fs_info, "couldn't read block group root");
return ret;
}
@@ -2978,6 +3003,16 @@ static int __cold init_tree_roots(struct btrfs_fs_info *fs_info)
int ret = 0;
int i;
+ if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2)) {
+ struct btrfs_root *root;
+
+ root = btrfs_alloc_root(fs_info, BTRFS_BLOCK_GROUP_TREE_OBJECTID,
+ GFP_KERNEL);
+ if (!root)
+ return -ENOMEM;
+ fs_info->block_group_root = root;
+ }
+
for (i = 0; i < BTRFS_NUM_BACKUP_ROOTS; i++) {
if (handle_error) {
if (!IS_ERR(tree_root->node))
diff --git a/fs/btrfs/disk-io.h b/fs/btrfs/disk-io.h
index 5e8bef4b7563..2e10514ecda8 100644
--- a/fs/btrfs/disk-io.h
+++ b/fs/btrfs/disk-io.h
@@ -111,6 +111,8 @@ static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
static inline struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info)
{
+ if (btrfs_fs_incompat(fs_info, EXTENT_TREE_V2))
+ return fs_info->block_group_root;
return btrfs_extent_root(fs_info, 0);
}
diff --git a/fs/btrfs/print-tree.c b/fs/btrfs/print-tree.c
index 0775ae9f4419..524fdb0ddd74 100644
--- a/fs/btrfs/print-tree.c
+++ b/fs/btrfs/print-tree.c
@@ -23,6 +23,7 @@ static const struct root_name_map root_map[] = {
{ BTRFS_QUOTA_TREE_OBJECTID, "QUOTA_TREE" },
{ BTRFS_UUID_TREE_OBJECTID, "UUID_TREE" },
{ BTRFS_FREE_SPACE_TREE_OBJECTID, "FREE_SPACE_TREE" },
+ { BTRFS_BLOCK_GROUP_TREE_OBJECTID, "BLOCK_GROUP_TREE" },
{ BTRFS_DATA_RELOC_TREE_OBJECTID, "DATA_RELOC_TREE" },
};
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