1 /* SPDX-License-Identifier: GPL-2.0-or-later */ 2 /* 3 * Copyright (C) 2020 Oracle. All Rights Reserved. 4 * Author: Darrick J. Wong <darrick.wong@oracle.com> 5 */ 6 #ifndef __XFS_BTREE_STAGING_H__ 7 #define __XFS_BTREE_STAGING_H__ 8 9 /* Fake root for an AG-rooted btree. */ 10 struct xbtree_afakeroot { 11 /* AG block number of the new btree root. */ 12 xfs_agblock_t af_root; 13 14 /* Height of the new btree. */ 15 unsigned int af_levels; 16 17 /* Number of blocks used by the btree. */ 18 unsigned int af_blocks; 19 }; 20 21 /* Cursor interactions with fake roots for AG-rooted btrees. */ 22 void xfs_btree_stage_afakeroot(struct xfs_btree_cur *cur, 23 struct xbtree_afakeroot *afake); 24 void xfs_btree_commit_afakeroot(struct xfs_btree_cur *cur, struct xfs_trans *tp, 25 struct xfs_buf *agbp, const struct xfs_btree_ops *ops); 26 27 /* Fake root for an inode-rooted btree. */ 28 struct xbtree_ifakeroot { 29 /* Fake inode fork. */ 30 struct xfs_ifork *if_fork; 31 32 /* Number of blocks used by the btree. */ 33 int64_t if_blocks; 34 35 /* Height of the new btree. */ 36 unsigned int if_levels; 37 38 /* Number of bytes available for this fork in the inode. */ 39 unsigned int if_fork_size; 40 41 /* Fork format. */ 42 unsigned int if_format; 43 44 /* Number of records. */ 45 unsigned int if_extents; 46 }; 47 48 /* Cursor interactions with fake roots for inode-rooted btrees. */ 49 void xfs_btree_stage_ifakeroot(struct xfs_btree_cur *cur, 50 struct xbtree_ifakeroot *ifake, 51 struct xfs_btree_ops **new_ops); 52 void xfs_btree_commit_ifakeroot(struct xfs_btree_cur *cur, struct xfs_trans *tp, 53 int whichfork, const struct xfs_btree_ops *ops); 54 55 /* Bulk loading of staged btrees. */ 56 typedef int (*xfs_btree_bload_get_record_fn)(struct xfs_btree_cur *cur, void *priv); 57 typedef int (*xfs_btree_bload_claim_block_fn)(struct xfs_btree_cur *cur, 58 union xfs_btree_ptr *ptr, void *priv); 59 typedef size_t (*xfs_btree_bload_iroot_size_fn)(struct xfs_btree_cur *cur, 60 unsigned int nr_this_level, void *priv); 61 62 struct xfs_btree_bload { 63 /* 64 * This function will be called nr_records times to load records into 65 * the btree. The function does this by setting the cursor's bc_rec 66 * field in in-core format. Records must be returned in sort order. 67 */ 68 xfs_btree_bload_get_record_fn get_record; 69 70 /* 71 * This function will be called nr_blocks times to obtain a pointer 72 * to a new btree block on disk. Callers must preallocate all space 73 * for the new btree before calling xfs_btree_bload, and this function 74 * is what claims that reservation. 75 */ 76 xfs_btree_bload_claim_block_fn claim_block; 77 78 /* 79 * This function should return the size of the in-core btree root 80 * block. It is only necessary for XFS_BTREE_ROOT_IN_INODE btree 81 * types. 82 */ 83 xfs_btree_bload_iroot_size_fn iroot_size; 84 85 /* 86 * The caller should set this to the number of records that will be 87 * stored in the new btree. 88 */ 89 uint64_t nr_records; 90 91 /* 92 * Number of free records to leave in each leaf block. If the caller 93 * sets this to -1, the slack value will be calculated to be halfway 94 * between maxrecs and minrecs. This typically leaves the block 75% 95 * full. Note that slack values are not enforced on inode root blocks. 96 */ 97 int leaf_slack; 98 99 /* 100 * Number of free key/ptrs pairs to leave in each node block. This 101 * field has the same semantics as leaf_slack. 102 */ 103 int node_slack; 104 105 /* 106 * The xfs_btree_bload_compute_geometry function will set this to the 107 * number of btree blocks needed to store nr_records records. 108 */ 109 uint64_t nr_blocks; 110 111 /* 112 * The xfs_btree_bload_compute_geometry function will set this to the 113 * height of the new btree. 114 */ 115 unsigned int btree_height; 116 }; 117 118 int xfs_btree_bload_compute_geometry(struct xfs_btree_cur *cur, 119 struct xfs_btree_bload *bbl, uint64_t nr_records); 120 int xfs_btree_bload(struct xfs_btree_cur *cur, struct xfs_btree_bload *bbl, 121 void *priv); 122 123 #endif /* __XFS_BTREE_STAGING_H__ */ 124