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btrfs: add a btrfs_block_group_root() helper

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With extent tree v2 we will have a separate root to hold the block group
items.  Add a btrfs_block_group_root() that will return the appropriate
root given the flags of the fs, and convert all functions that need to
modify block group items to use the helper.

Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Josef Bacik 2021-11-05 16:45:36 -04:00 committed by David Sterba
parent 9f05c09d6b
commit dfe8aec452
2 changed files with 15 additions and 9 deletions
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19
fs/btrfs/block-group.c
View file

@ -841,7 +841,7 @@ static int remove_block_group_item(struct btrfs_trans_handle *trans,
struct btrfs_key key;
int ret;
root = fs_info->extent_root;
root = btrfs_block_group_root(fs_info);
key.objectid = block_group->start;
key.type = BTRFS_BLOCK_GROUP_ITEM_KEY;
key.offset = block_group->length;
@ -1106,6 +1106,7 @@ int btrfs_remove_block_group(struct btrfs_trans_handle *trans,
struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
struct btrfs_fs_info *fs_info, const u64 chunk_offset)
{
struct btrfs_root *root = btrfs_block_group_root(fs_info);
struct extent_map_tree *em_tree = &fs_info->mapping_tree;
struct extent_map *em;
struct map_lookup *map;
@ -1139,8 +1140,7 @@ struct btrfs_trans_handle *btrfs_start_trans_remove_block_group(
num_items = 3 + map->num_stripes;
free_extent_map(em);
return btrfs_start_transaction_fallback_global_rsv(fs_info->extent_root,
num_items);
return btrfs_start_transaction_fallback_global_rsv(root, num_items);
}
/*
@ -1678,7 +1678,7 @@ static int find_first_block_group(struct btrfs_fs_info *fs_info,
struct btrfs_path *path,
struct btrfs_key *key)
{
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_root *root = btrfs_block_group_root(fs_info);
int ret;
struct btrfs_key found_key;
struct extent_buffer *leaf;
@ -2165,6 +2165,7 @@ static int fill_dummy_bgs(struct btrfs_fs_info *fs_info)
int btrfs_read_block_groups(struct btrfs_fs_info *info)
{
struct btrfs_root *root = btrfs_block_group_root(info);
struct btrfs_path *path;
int ret;
struct btrfs_block_group *cache;
@ -2173,7 +2174,7 @@ int btrfs_read_block_groups(struct btrfs_fs_info *info)
int need_clear = 0;
u64 cache_gen;
if (!info->extent_root)
if (!root)
return fill_dummy_bgs(info);
key.objectid = 0;
@ -2276,7 +2277,7 @@ static int insert_block_group_item(struct btrfs_trans_handle *trans,
{
struct btrfs_fs_info *fs_info = trans->fs_info;
struct btrfs_block_group_item bgi;
struct btrfs_root *root;
struct btrfs_root *root = btrfs_block_group_root(fs_info);
struct btrfs_key key;
spin_lock(&block_group->lock);
@ -2289,7 +2290,6 @@ static int insert_block_group_item(struct btrfs_trans_handle *trans,
key.offset = block_group->length;
spin_unlock(&block_group->lock);
root = fs_info->extent_root;
return btrfs_insert_item(trans, root, &key, &bgi, sizeof(bgi));
}
@ -2543,12 +2543,13 @@ int btrfs_inc_block_group_ro(struct btrfs_block_group *cache,
{
struct btrfs_fs_info *fs_info = cache->fs_info;
struct btrfs_trans_handle *trans;
struct btrfs_root *root = btrfs_block_group_root(fs_info);
u64 alloc_flags;
int ret;
bool dirty_bg_running;
do {
trans = btrfs_join_transaction(fs_info->extent_root);
trans = btrfs_join_transaction(root);
if (IS_ERR(trans))
return PTR_ERR(trans);
@ -2653,7 +2654,7 @@ static int update_block_group_item(struct btrfs_trans_handle *trans,
{
struct btrfs_fs_info *fs_info = trans->fs_info;
int ret;
struct btrfs_root *root = fs_info->extent_root;
struct btrfs_root *root = btrfs_block_group_root(fs_info);
unsigned long bi;
struct extent_buffer *leaf;
struct btrfs_block_group_item bgi;

5
fs/btrfs/disk-io.h
View file

@ -103,6 +103,11 @@ static inline struct btrfs_root *btrfs_grab_root(struct btrfs_root *root)
return NULL;
}
static inline struct btrfs_root *btrfs_block_group_root(struct btrfs_fs_info *fs_info)
{
return fs_info->extent_root;
}
void btrfs_put_root(struct btrfs_root *root);
void btrfs_mark_buffer_dirty(struct extent_buffer *buf);
int btrfs_buffer_uptodate(struct extent_buffer *buf, u64 parent_transid,