diff options
Diffstat (limited to 'fs/ocfs2/alloc.h')
| -rw-r--r-- | fs/ocfs2/alloc.h | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h index df0e778a2b68..3f4348923b73 100644 --- a/fs/ocfs2/alloc.h +++ b/fs/ocfs2/alloc.h @@ -115,6 +115,14 @@ int ocfs2_add_clusters_in_btree(handle_t *handle, struct ocfs2_alloc_context *meta_ac, enum ocfs2_alloc_restarted *reason_ret); struct ocfs2_cached_dealloc_ctxt; +struct ocfs2_path; +int ocfs2_split_extent(handle_t *handle, + struct ocfs2_extent_tree *et, + struct ocfs2_path *path, + int split_index, + struct ocfs2_extent_rec *split_rec, + struct ocfs2_alloc_context *meta_ac, + struct ocfs2_cached_dealloc_ctxt *dealloc); int ocfs2_mark_extent_written(struct inode *inode, struct ocfs2_extent_tree *et, handle_t *handle, u32 cpos, u32 len, u32 phys, @@ -254,4 +262,45 @@ static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec) return !rec->e_leaf_clusters; } +/* + * Structures which describe a path through a btree, and functions to + * manipulate them. + * + * The idea here is to be as generic as possible with the tree + * manipulation code. + */ +struct ocfs2_path_item { + struct buffer_head *bh; + struct ocfs2_extent_list *el; +}; + +#define OCFS2_MAX_PATH_DEPTH 5 + +struct ocfs2_path { + int p_tree_depth; + ocfs2_journal_access_func p_root_access; + struct ocfs2_path_item p_node[OCFS2_MAX_PATH_DEPTH]; +}; + +#define path_root_bh(_path) ((_path)->p_node[0].bh) +#define path_root_el(_path) ((_path)->p_node[0].el) +#define path_root_access(_path)((_path)->p_root_access) +#define path_leaf_bh(_path) ((_path)->p_node[(_path)->p_tree_depth].bh) +#define path_leaf_el(_path) ((_path)->p_node[(_path)->p_tree_depth].el) +#define path_num_items(_path) ((_path)->p_tree_depth + 1) + +void ocfs2_reinit_path(struct ocfs2_path *path, int keep_root); +void ocfs2_free_path(struct ocfs2_path *path); +int ocfs2_find_path(struct ocfs2_caching_info *ci, + struct ocfs2_path *path, + u32 cpos); +struct ocfs2_path *ocfs2_new_path_from_path(struct ocfs2_path *path); +struct ocfs2_path *ocfs2_new_path_from_et(struct ocfs2_extent_tree *et); +int ocfs2_path_bh_journal_access(handle_t *handle, + struct ocfs2_caching_info *ci, + struct ocfs2_path *path, + int idx); +int ocfs2_journal_access_path(struct ocfs2_caching_info *ci, + handle_t *handle, + struct ocfs2_path *path); #endif /* OCFS2_ALLOC_H */ |