diff options
Diffstat (limited to 'fs/ocfs2/alloc.h')
| -rw-r--r-- | fs/ocfs2/alloc.h | 111 |
1 files changed, 62 insertions, 49 deletions
diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h index 5cc9a83cf1a..35ad07f9610 100644 --- a/fs/ocfs2/alloc.h +++ b/fs/ocfs2/alloc.h @@ -26,46 +26,66 @@ #ifndef OCFS2_ALLOC_H #define OCFS2_ALLOC_H -enum ocfs2_extent_tree_type { - OCFS2_DINODE_EXTENT = 0, - OCFS2_XATTR_VALUE_EXTENT, - OCFS2_XATTR_TREE_EXTENT, -}; /* * For xattr tree leaf, we limit the leaf byte size to be 64K. */ #define OCFS2_MAX_XATTR_TREE_LEAF_SIZE 65536 +/* + * ocfs2_extent_tree and ocfs2_extent_tree_operations are used to abstract + * the b-tree operations in ocfs2. Now all the b-tree operations are not + * limited to ocfs2_dinode only. Any data which need to allocate clusters + * to store can use b-tree. And it only needs to implement its ocfs2_extent_tree + * and operation. + * + * ocfs2_extent_tree becomes the first-class object for extent tree + * manipulation. Callers of the alloc.c code need to fill it via one of + * the ocfs2_get_*_extent_tree() operations below. + * + * ocfs2_extent_tree contains info for the root of the b-tree, it must have a + * root ocfs2_extent_list and a root_bh so that they can be used in the b-tree + * functions. + * ocfs2_extent_tree_operations abstract the normal operations we do for + * the root of extent b-tree. + */ +struct ocfs2_extent_tree_operations; +struct ocfs2_extent_tree { + struct ocfs2_extent_tree_operations *et_ops; + struct buffer_head *et_root_bh; + struct ocfs2_extent_list *et_root_el; + void *et_object; + unsigned int et_max_leaf_clusters; +}; + +/* + * ocfs2_*_get_extent_tree() will fill an ocfs2_extent_tree from the + * specified object buffer. The bh is referenced until + * ocfs2_put_extent_tree(). + */ +void ocfs2_get_dinode_extent_tree(struct ocfs2_extent_tree *et, + struct inode *inode, + struct buffer_head *bh); +void ocfs2_get_xattr_tree_extent_tree(struct ocfs2_extent_tree *et, + struct inode *inode, + struct buffer_head *bh); +void ocfs2_get_xattr_value_extent_tree(struct ocfs2_extent_tree *et, + struct inode *inode, + struct buffer_head *bh, + struct ocfs2_xattr_value_root *xv); +void ocfs2_put_extent_tree(struct ocfs2_extent_tree *et); + struct ocfs2_alloc_context; -int ocfs2_dinode_insert_extent(struct ocfs2_super *osb, - handle_t *handle, - struct inode *inode, - struct buffer_head *root_bh, - u32 cpos, - u64 start_blk, - u32 new_clusters, - u8 flags, - struct ocfs2_alloc_context *meta_ac); -int ocfs2_xattr_value_insert_extent(struct ocfs2_super *osb, - handle_t *handle, - struct inode *inode, - struct buffer_head *root_bh, - u32 cpos, - u64 start_blk, - u32 new_clusters, - u8 flags, - struct ocfs2_alloc_context *meta_ac, - struct ocfs2_xattr_value_root *xv); -int ocfs2_xattr_tree_insert_extent(struct ocfs2_super *osb, - handle_t *handle, - struct inode *inode, - struct buffer_head *root_bh, - u32 cpos, - u64 start_blk, - u32 new_clusters, - u8 flags, - struct ocfs2_alloc_context *meta_ac); +int ocfs2_insert_extent(struct ocfs2_super *osb, + handle_t *handle, + struct inode *inode, + struct ocfs2_extent_tree *et, + u32 cpos, + u64 start_blk, + u32 new_clusters, + u8 flags, + struct ocfs2_alloc_context *meta_ac); + enum ocfs2_alloc_restarted { RESTART_NONE = 0, RESTART_TRANS, @@ -76,32 +96,25 @@ int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb, u32 *logical_offset, u32 clusters_to_add, int mark_unwritten, - struct buffer_head *root_bh, - struct ocfs2_extent_list *root_el, + struct ocfs2_extent_tree *et, handle_t *handle, struct ocfs2_alloc_context *data_ac, struct ocfs2_alloc_context *meta_ac, - enum ocfs2_alloc_restarted *reason_ret, - enum ocfs2_extent_tree_type type, - void *private); + enum ocfs2_alloc_restarted *reason_ret); struct ocfs2_cached_dealloc_ctxt; -int ocfs2_mark_extent_written(struct inode *inode, struct buffer_head *root_bh, +int ocfs2_mark_extent_written(struct inode *inode, + struct ocfs2_extent_tree *et, handle_t *handle, u32 cpos, u32 len, u32 phys, struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc, - enum ocfs2_extent_tree_type et_type, - void *private); -int ocfs2_remove_extent(struct inode *inode, struct buffer_head *root_bh, + struct ocfs2_cached_dealloc_ctxt *dealloc); +int ocfs2_remove_extent(struct inode *inode, + struct ocfs2_extent_tree *et, u32 cpos, u32 len, handle_t *handle, struct ocfs2_alloc_context *meta_ac, - struct ocfs2_cached_dealloc_ctxt *dealloc, - enum ocfs2_extent_tree_type et_type, - void *private); + struct ocfs2_cached_dealloc_ctxt *dealloc); int ocfs2_num_free_extents(struct ocfs2_super *osb, struct inode *inode, - struct buffer_head *root_bh, - enum ocfs2_extent_tree_type et_type, - void *private); + struct ocfs2_extent_tree *et); /* * how many new metadata chunks would an allocation need at maximum? |