#ifndef OCFS2_ALLOC_H
#define OCFS2_ALLOC_H
+
+/*
+ * 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_init_*_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. With metadata ecc, we now call different journal_access
+ * functions for each type of metadata, so it must have the
+ * root_journal_access function.
+ * 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;
+ ocfs2_journal_access_func et_root_journal_access;
+ void *et_object;
+ unsigned int et_max_leaf_clusters;
+};
+
+/*
+ * ocfs2_init_*_extent_tree() will fill an ocfs2_extent_tree from the
+ * specified object buffer.
+ */
+void ocfs2_init_dinode_extent_tree(struct ocfs2_extent_tree *et,
+ struct inode *inode,
+ struct buffer_head *bh);
+void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
+ struct inode *inode,
+ struct buffer_head *bh);
+struct ocfs2_xattr_value_buf;
+void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
+ struct inode *inode,
+ struct ocfs2_xattr_value_buf *vb);
+void ocfs2_init_dx_root_extent_tree(struct ocfs2_extent_tree *et,
+ struct inode *inode,
+ struct buffer_head *bh);
+
+/*
+ * Read an extent block into *bh. If *bh is NULL, a bh will be
+ * allocated. This is a cached read. The extent block will be validated
+ * with ocfs2_validate_extent_block().
+ */
+int ocfs2_read_extent_block(struct inode *inode, u64 eb_blkno,
+ struct buffer_head **bh);
+
struct ocfs2_alloc_context;
int ocfs2_insert_extent(struct ocfs2_super *osb,
handle_t *handle,
struct inode *inode,
- struct buffer_head *fe_bh,
+ 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,
+ RESTART_META
+};
+int ocfs2_add_clusters_in_btree(struct ocfs2_super *osb,
+ struct inode *inode,
+ u32 *logical_offset,
+ u32 clusters_to_add,
+ int mark_unwritten,
+ 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);
+struct ocfs2_cached_dealloc_ctxt;
+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);
+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);
+int ocfs2_remove_btree_range(struct inode *inode,
+ struct ocfs2_extent_tree *et,
+ u32 cpos, u32 phys_cpos, u32 len,
+ struct ocfs2_cached_dealloc_ctxt *dealloc);
+
int ocfs2_num_free_extents(struct ocfs2_super *osb,
struct inode *inode,
- struct ocfs2_dinode *fe);
-/* how many new metadata chunks would an allocation need at maximum? */
-static inline int ocfs2_extend_meta_needed(struct ocfs2_dinode *fe)
+ struct ocfs2_extent_tree *et);
+
+/*
+ * how many new metadata chunks would an allocation need at maximum?
+ *
+ * Please note that the caller must make sure that root_el is the root
+ * of extent tree. So for an inode, it should be &fe->id2.i_list. Otherwise
+ * the result may be wrong.
+ */
+static inline int ocfs2_extend_meta_needed(struct ocfs2_extent_list *root_el)
{
/*
* Rather than do all the work of determining how much we need
* new tree_depth==0 extent_block, and one block at the new
* top-of-the tree.
*/
- return le16_to_cpu(fe->id2.i_list.l_tree_depth) + 2;
+ return le16_to_cpu(root_el->l_tree_depth) + 2;
}
+void ocfs2_dinode_new_extent_list(struct inode *inode, struct ocfs2_dinode *di);
+void ocfs2_set_inode_data_inline(struct inode *inode, struct ocfs2_dinode *di);
+int ocfs2_convert_inline_data_to_extents(struct inode *inode,
+ struct buffer_head *di_bh);
+
int ocfs2_truncate_log_init(struct ocfs2_super *osb);
void ocfs2_truncate_log_shutdown(struct ocfs2_super *osb);
void ocfs2_schedule_truncate_log_flush(struct ocfs2_super *osb,
struct ocfs2_dinode **tl_copy);
int ocfs2_complete_truncate_log_recovery(struct ocfs2_super *osb,
struct ocfs2_dinode *tl_copy);
+int ocfs2_truncate_log_needs_flush(struct ocfs2_super *osb);
+int ocfs2_truncate_log_append(struct ocfs2_super *osb,
+ handle_t *handle,
+ u64 start_blk,
+ unsigned int num_clusters);
+int __ocfs2_flush_truncate_log(struct ocfs2_super *osb);
+
+/*
+ * Process local structure which describes the block unlinks done
+ * during an operation. This is populated via
+ * ocfs2_cache_block_dealloc().
+ *
+ * ocfs2_run_deallocs() should be called after the potentially
+ * de-allocating routines. No journal handles should be open, and most
+ * locks should have been dropped.
+ */
+struct ocfs2_cached_dealloc_ctxt {
+ struct ocfs2_per_slot_free_list *c_first_suballocator;
+ struct ocfs2_cached_block_free *c_global_allocator;
+};
+static inline void ocfs2_init_dealloc_ctxt(struct ocfs2_cached_dealloc_ctxt *c)
+{
+ c->c_first_suballocator = NULL;
+ c->c_global_allocator = NULL;
+}
+int ocfs2_cache_cluster_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
+ u64 blkno, unsigned int bit);
+static inline int ocfs2_dealloc_has_cluster(struct ocfs2_cached_dealloc_ctxt *c)
+{
+ return c->c_global_allocator != NULL;
+}
+int ocfs2_run_deallocs(struct ocfs2_super *osb,
+ struct ocfs2_cached_dealloc_ctxt *ctxt);
struct ocfs2_truncate_context {
- struct inode *tc_ext_alloc_inode;
- struct buffer_head *tc_ext_alloc_bh;
+ struct ocfs2_cached_dealloc_ctxt tc_dealloc;
int tc_ext_alloc_locked; /* is it cluster locked? */
/* these get destroyed once it's passed to ocfs2_commit_truncate. */
struct buffer_head *tc_last_eb_bh;
};
+int ocfs2_zero_range_for_truncate(struct inode *inode, handle_t *handle,
+ u64 range_start, u64 range_end);
int ocfs2_prepare_truncate(struct ocfs2_super *osb,
struct inode *inode,
struct buffer_head *fe_bh,
struct inode *inode,
struct buffer_head *fe_bh,
struct ocfs2_truncate_context *tc);
+int ocfs2_truncate_inline(struct inode *inode, struct buffer_head *di_bh,
+ unsigned int start, unsigned int end, int trunc);
+
+int ocfs2_find_leaf(struct inode *inode, struct ocfs2_extent_list *root_el,
+ u32 cpos, struct buffer_head **leaf_bh);
+int ocfs2_search_extent_list(struct ocfs2_extent_list *el, u32 v_cluster);
+
+/*
+ * Helper function to look at the # of clusters in an extent record.
+ */
+static inline unsigned int ocfs2_rec_clusters(struct ocfs2_extent_list *el,
+ struct ocfs2_extent_rec *rec)
+{
+ /*
+ * Cluster count in extent records is slightly different
+ * between interior nodes and leaf nodes. This is to support
+ * unwritten extents which need a flags field in leaf node
+ * records, thus shrinking the available space for a clusters
+ * field.
+ */
+ if (el->l_tree_depth)
+ return le32_to_cpu(rec->e_int_clusters);
+ else
+ return le16_to_cpu(rec->e_leaf_clusters);
+}
+
+/*
+ * This is only valid for leaf nodes, which are the only ones that can
+ * have empty extents anyway.
+ */
+static inline int ocfs2_is_empty_extent(struct ocfs2_extent_rec *rec)
+{
+ return !rec->e_leaf_clusters;
+}
#endif /* OCFS2_ALLOC_H */