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diff --git a/fs/ocfs2/alloc.h b/fs/ocfs2/alloc.h
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+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ * alloc.h
+ *
+ * Function prototypes
+ *
+ * Copyright (C) 2002, 2004 Oracle. All rights reserved.
+ */
+
+#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. It needs the ocfs2_caching_info structure associated with
+ * I/O on the tree. 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 {
+ const struct ocfs2_extent_tree_operations *et_ops;
+ struct buffer_head *et_root_bh;
+ struct ocfs2_extent_list *et_root_el;
+ struct ocfs2_caching_info *et_ci;
+ ocfs2_journal_access_func et_root_journal_access;
+ void *et_object;
+ unsigned int et_max_leaf_clusters;
+ struct ocfs2_cached_dealloc_ctxt *et_dealloc;
+};
+
+/*
+ * 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 ocfs2_caching_info *ci,
+ struct buffer_head *bh);
+void ocfs2_init_xattr_tree_extent_tree(struct ocfs2_extent_tree *et,
+ struct ocfs2_caching_info *ci,
+ struct buffer_head *bh);
+struct ocfs2_xattr_value_buf;
+void ocfs2_init_xattr_value_extent_tree(struct ocfs2_extent_tree *et,
+ struct ocfs2_caching_info *ci,
+ struct ocfs2_xattr_value_buf *vb);
+void ocfs2_init_dx_root_extent_tree(struct ocfs2_extent_tree *et,
+ struct ocfs2_caching_info *ci,
+ struct buffer_head *bh);
+void ocfs2_init_refcount_extent_tree(struct ocfs2_extent_tree *et,
+ struct ocfs2_caching_info *ci,
+ 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 ocfs2_caching_info *ci, u64 eb_blkno,
+ struct buffer_head **bh);
+
+struct ocfs2_alloc_context;
+int ocfs2_insert_extent(handle_t *handle,
+ 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(handle_t *handle,
+ struct ocfs2_extent_tree *et,
+ u32 *logical_offset,
+ u32 clusters_to_add,
+ int mark_unwritten,
+ struct ocfs2_alloc_context *data_ac,
+ 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,
+ struct ocfs2_alloc_context *meta_ac,
+ struct ocfs2_cached_dealloc_ctxt *dealloc);
+int ocfs2_change_extent_flag(handle_t *handle,
+ struct ocfs2_extent_tree *et,
+ u32 cpos, u32 len, u32 phys,
+ struct ocfs2_alloc_context *meta_ac,
+ struct ocfs2_cached_dealloc_ctxt *dealloc,
+ int new_flags, int clear_flags);
+int ocfs2_remove_extent(handle_t *handle, struct ocfs2_extent_tree *et,
+ u32 cpos, u32 len,
+ 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, int flags,
+ struct ocfs2_cached_dealloc_ctxt *dealloc,
+ u64 refcount_loc, bool refcount_tree_locked);
+
+int ocfs2_num_free_extents(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
+ * (involves a ton of reads and locks), just ask for the
+ * maximal limit. That's a tree depth shift. So, one block for
+ * level of the tree (current l_tree_depth), one block for the
+ * new tree_depth==0 extent_block, and one block at the new
+ * top-of-the tree.
+ */
+ 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,
+ int cancel);
+int ocfs2_flush_truncate_log(struct ocfs2_super *osb);
+int ocfs2_begin_truncate_log_recovery(struct ocfs2_super *osb,
+ int slot_num,
+ 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);
+int ocfs2_try_to_free_truncate_log(struct ocfs2_super *osb,
+ unsigned int needed);
+
+/*
+ * 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);
+int ocfs2_cache_block_dealloc(struct ocfs2_cached_dealloc_ctxt *ctxt,
+ int type, int slot, u64 suballoc, 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 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_commit_truncate(struct ocfs2_super *osb,
+ struct inode *inode,
+ struct buffer_head *di_bh);
+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 ocfs2_caching_info *ci,
+ 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);
+
+int ocfs2_trim_fs(struct super_block *sb, struct fstrim_range *range);
+/*
+ * 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;
+}
+
+int ocfs2_grab_pages(struct inode *inode, loff_t start, loff_t end,
+ struct page **pages, int *num);
+void ocfs2_map_and_dirty_page(struct inode *inode, handle_t *handle,
+ unsigned int from, unsigned int to,
+ struct page *page, int zero, u64 *phys);
+/*
+ * 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);
+int ocfs2_find_cpos_for_right_leaf(struct super_block *sb,
+ struct ocfs2_path *path, u32 *cpos);
+int ocfs2_find_cpos_for_left_leaf(struct super_block *sb,
+ struct ocfs2_path *path, u32 *cpos);
+int ocfs2_find_subtree_root(struct ocfs2_extent_tree *et,
+ struct ocfs2_path *left,
+ struct ocfs2_path *right);
+#endif /* OCFS2_ALLOC_H */