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-rw-r--r--fs/btrfs/free-space-tree.c50
1 files changed, 36 insertions, 14 deletions
diff --git a/fs/btrfs/free-space-tree.c b/fs/btrfs/free-space-tree.c
index 3abec44c6255..655aad0f9e1c 100644
--- a/fs/btrfs/free-space-tree.c
+++ b/fs/btrfs/free-space-tree.c
@@ -16,6 +16,18 @@ static int __add_block_group_free_space(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group,
struct btrfs_path *path);
+static struct btrfs_root *btrfs_free_space_root(
+ struct btrfs_block_group *block_group)
+{
+ struct btrfs_key key = {
+ .objectid = BTRFS_FREE_SPACE_TREE_OBJECTID,
+ .type = BTRFS_ROOT_ITEM_KEY,
+ .offset = 0,
+ };
+
+ return btrfs_global_root(block_group->fs_info, &key);
+}
+
void set_free_space_tree_thresholds(struct btrfs_block_group *cache)
{
u32 bitmap_range;
@@ -51,7 +63,7 @@ static int add_new_free_space_info(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group,
struct btrfs_path *path)
{
- struct btrfs_root *root = trans->fs_info->free_space_root;
+ struct btrfs_root *root = btrfs_free_space_root(block_group);
struct btrfs_free_space_info *info;
struct btrfs_key key;
struct extent_buffer *leaf;
@@ -85,7 +97,7 @@ struct btrfs_free_space_info *search_free_space_info(
struct btrfs_path *path, int cow)
{
struct btrfs_fs_info *fs_info = block_group->fs_info;
- struct btrfs_root *root = fs_info->free_space_root;
+ struct btrfs_root *root = btrfs_free_space_root(block_group);
struct btrfs_key key;
int ret;
@@ -188,7 +200,7 @@ int convert_free_space_to_bitmaps(struct btrfs_trans_handle *trans,
struct btrfs_path *path)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
- struct btrfs_root *root = fs_info->free_space_root;
+ struct btrfs_root *root = btrfs_free_space_root(block_group);
struct btrfs_free_space_info *info;
struct btrfs_key key, found_key;
struct extent_buffer *leaf;
@@ -326,7 +338,7 @@ int convert_free_space_to_extents(struct btrfs_trans_handle *trans,
struct btrfs_path *path)
{
struct btrfs_fs_info *fs_info = trans->fs_info;
- struct btrfs_root *root = fs_info->free_space_root;
+ struct btrfs_root *root = btrfs_free_space_root(block_group);
struct btrfs_free_space_info *info;
struct btrfs_key key, found_key;
struct extent_buffer *leaf;
@@ -586,7 +598,7 @@ static int modify_free_space_bitmap(struct btrfs_trans_handle *trans,
struct btrfs_path *path,
u64 start, u64 size, int remove)
{
- struct btrfs_root *root = block_group->fs_info->free_space_root;
+ struct btrfs_root *root = btrfs_free_space_root(block_group);
struct btrfs_key key;
u64 end = start + size;
u64 cur_start, cur_size;
@@ -699,7 +711,7 @@ static int remove_free_space_extent(struct btrfs_trans_handle *trans,
struct btrfs_path *path,
u64 start, u64 size)
{
- struct btrfs_root *root = trans->fs_info->free_space_root;
+ struct btrfs_root *root = btrfs_free_space_root(block_group);
struct btrfs_key key;
u64 found_start, found_end;
u64 end = start + size;
@@ -851,7 +863,7 @@ static int add_free_space_extent(struct btrfs_trans_handle *trans,
struct btrfs_path *path,
u64 start, u64 size)
{
- struct btrfs_root *root = trans->fs_info->free_space_root;
+ struct btrfs_root *root = btrfs_free_space_root(block_group);
struct btrfs_key key, new_key;
u64 found_start, found_end;
u64 end = start + size;
@@ -1046,7 +1058,7 @@ out:
static int populate_free_space_tree(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group)
{
- struct btrfs_root *extent_root = trans->fs_info->extent_root;
+ struct btrfs_root *extent_root;
struct btrfs_path *path, *path2;
struct btrfs_key key;
u64 start, end;
@@ -1080,6 +1092,7 @@ static int populate_free_space_tree(struct btrfs_trans_handle *trans,
key.type = BTRFS_EXTENT_ITEM_KEY;
key.offset = 0;
+ extent_root = btrfs_extent_root(trans->fs_info, key.objectid);
ret = btrfs_search_slot_for_read(extent_root, &key, path, 1, 0);
if (ret < 0)
goto out_locked;
@@ -1157,7 +1170,11 @@ int btrfs_create_free_space_tree(struct btrfs_fs_info *fs_info)
ret = PTR_ERR(free_space_root);
goto abort;
}
- fs_info->free_space_root = free_space_root;
+ ret = btrfs_global_root_insert(free_space_root);
+ if (ret) {
+ btrfs_put_root(free_space_root);
+ goto abort;
+ }
node = rb_first(&fs_info->block_group_cache_tree);
while (node) {
@@ -1232,7 +1249,12 @@ int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info)
{
struct btrfs_trans_handle *trans;
struct btrfs_root *tree_root = fs_info->tree_root;
- struct btrfs_root *free_space_root = fs_info->free_space_root;
+ struct btrfs_key key = {
+ .objectid = BTRFS_FREE_SPACE_TREE_OBJECTID,
+ .type = BTRFS_ROOT_ITEM_KEY,
+ .offset = 0,
+ };
+ struct btrfs_root *free_space_root = btrfs_global_root(fs_info, &key);
int ret;
trans = btrfs_start_transaction(tree_root, 0);
@@ -1241,7 +1263,6 @@ int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info)
btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE);
btrfs_clear_fs_compat_ro(fs_info, FREE_SPACE_TREE_VALID);
- fs_info->free_space_root = NULL;
ret = clear_free_space_tree(trans, free_space_root);
if (ret)
@@ -1251,6 +1272,7 @@ int btrfs_clear_free_space_tree(struct btrfs_fs_info *fs_info)
if (ret)
goto abort;
+ btrfs_global_root_delete(free_space_root);
list_del(&free_space_root->dirty_list);
btrfs_tree_lock(free_space_root->node);
@@ -1319,7 +1341,7 @@ out:
int remove_block_group_free_space(struct btrfs_trans_handle *trans,
struct btrfs_block_group *block_group)
{
- struct btrfs_root *root = trans->fs_info->free_space_root;
+ struct btrfs_root *root = btrfs_free_space_root(block_group);
struct btrfs_path *path;
struct btrfs_key key, found_key;
struct extent_buffer *leaf;
@@ -1410,7 +1432,7 @@ static int load_free_space_bitmaps(struct btrfs_caching_control *caching_ctl,
block_group = caching_ctl->block_group;
fs_info = block_group->fs_info;
- root = fs_info->free_space_root;
+ root = btrfs_free_space_root(block_group);
end = block_group->start + block_group->length;
@@ -1488,7 +1510,7 @@ static int load_free_space_extents(struct btrfs_caching_control *caching_ctl,
block_group = caching_ctl->block_group;
fs_info = block_group->fs_info;
- root = fs_info->free_space_root;
+ root = btrfs_free_space_root(block_group);
end = block_group->start + block_group->length;
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