/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* Copyright (C) 2020 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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*/
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#ifndef __XFS_BTREE_STAGING_H__
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#define __XFS_BTREE_STAGING_H__
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/* Fake root for an AG-rooted btree. */
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struct xbtree_afakeroot {
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/* AG block number of the new btree root. */
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xfs_agblock_t af_root;
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/* Height of the new btree. */
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unsigned int af_levels;
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/* Number of blocks used by the btree. */
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unsigned int af_blocks;
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};
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/* Cursor interactions with fake roots for AG-rooted btrees. */
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void xfs_btree_stage_afakeroot(struct xfs_btree_cur *cur,
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struct xbtree_afakeroot *afake);
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void xfs_btree_commit_afakeroot(struct xfs_btree_cur *cur, struct xfs_trans *tp,
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struct xfs_buf *agbp, const struct xfs_btree_ops *ops);
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/* Fake root for an inode-rooted btree. */
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struct xbtree_ifakeroot {
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/* Fake inode fork. */
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struct xfs_ifork *if_fork;
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/* Number of blocks used by the btree. */
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int64_t if_blocks;
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/* Height of the new btree. */
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unsigned int if_levels;
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/* Number of bytes available for this fork in the inode. */
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unsigned int if_fork_size;
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/* Fork format. */
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unsigned int if_format;
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/* Number of records. */
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unsigned int if_extents;
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};
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/* Cursor interactions with fake roots for inode-rooted btrees. */
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void xfs_btree_stage_ifakeroot(struct xfs_btree_cur *cur,
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struct xbtree_ifakeroot *ifake,
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struct xfs_btree_ops **new_ops);
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void xfs_btree_commit_ifakeroot(struct xfs_btree_cur *cur, struct xfs_trans *tp,
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int whichfork, const struct xfs_btree_ops *ops);
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/* Bulk loading of staged btrees. */
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typedef int (*xfs_btree_bload_get_record_fn)(struct xfs_btree_cur *cur, void *priv);
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typedef int (*xfs_btree_bload_claim_block_fn)(struct xfs_btree_cur *cur,
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union xfs_btree_ptr *ptr, void *priv);
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typedef size_t (*xfs_btree_bload_iroot_size_fn)(struct xfs_btree_cur *cur,
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unsigned int nr_this_level, void *priv);
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struct xfs_btree_bload {
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/*
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* This function will be called nr_records times to load records into
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* the btree. The function does this by setting the cursor's bc_rec
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* field in in-core format. Records must be returned in sort order.
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*/
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xfs_btree_bload_get_record_fn get_record;
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/*
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* This function will be called nr_blocks times to obtain a pointer
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* to a new btree block on disk. Callers must preallocate all space
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* for the new btree before calling xfs_btree_bload, and this function
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* is what claims that reservation.
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*/
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xfs_btree_bload_claim_block_fn claim_block;
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/*
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* This function should return the size of the in-core btree root
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* block. It is only necessary for XFS_BTREE_ROOT_IN_INODE btree
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* types.
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*/
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xfs_btree_bload_iroot_size_fn iroot_size;
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/*
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* The caller should set this to the number of records that will be
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* stored in the new btree.
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*/
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uint64_t nr_records;
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/*
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* Number of free records to leave in each leaf block. If the caller
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* sets this to -1, the slack value will be calculated to be halfway
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* between maxrecs and minrecs. This typically leaves the block 75%
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* full. Note that slack values are not enforced on inode root blocks.
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*/
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int leaf_slack;
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/*
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* Number of free key/ptrs pairs to leave in each node block. This
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* field has the same semantics as leaf_slack.
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*/
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int node_slack;
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/*
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* The xfs_btree_bload_compute_geometry function will set this to the
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* number of btree blocks needed to store nr_records records.
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*/
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uint64_t nr_blocks;
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/*
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* The xfs_btree_bload_compute_geometry function will set this to the
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* height of the new btree.
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*/
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unsigned int btree_height;
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};
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int xfs_btree_bload_compute_geometry(struct xfs_btree_cur *cur,
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struct xfs_btree_bload *bbl, uint64_t nr_records);
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int xfs_btree_bload(struct xfs_btree_cur *cur, struct xfs_btree_bload *bbl,
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void *priv);
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#endif /* __XFS_BTREE_STAGING_H__ */
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