1 | /* SPDX-License-Identifier: GPL-2.0+ */ |
2 | /* |
3 | * NILFS B-tree. |
4 | * |
5 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. |
6 | * |
7 | * Written by Koji Sato. |
8 | */ |
9 | |
10 | #ifndef _NILFS_BTREE_H |
11 | #define _NILFS_BTREE_H |
12 | |
13 | #include <linux/types.h> |
14 | #include <linux/buffer_head.h> |
15 | #include <linux/list.h> |
16 | #include <linux/nilfs2_ondisk.h> /* nilfs_btree_node */ |
17 | #include "btnode.h" |
18 | #include "bmap.h" |
19 | |
20 | /** |
21 | * struct nilfs_btree_path - A path on which B-tree operations are executed |
22 | * @bp_bh: buffer head of node block |
23 | * @bp_sib_bh: buffer head of sibling node block |
24 | * @bp_index: index of child node |
25 | * @bp_oldreq: ptr end request for old ptr |
26 | * @bp_newreq: ptr alloc request for new ptr |
27 | * @bp_op: rebalance operation |
28 | */ |
29 | struct nilfs_btree_path { |
30 | struct buffer_head *bp_bh; |
31 | struct buffer_head *bp_sib_bh; |
32 | int bp_index; |
33 | union nilfs_bmap_ptr_req bp_oldreq; |
34 | union nilfs_bmap_ptr_req bp_newreq; |
35 | struct nilfs_btnode_chkey_ctxt bp_ctxt; |
36 | void (*bp_op)(struct nilfs_bmap *, struct nilfs_btree_path *, |
37 | int, __u64 *, __u64 *); |
38 | }; |
39 | |
40 | #define NILFS_BTREE_ROOT_SIZE NILFS_BMAP_SIZE |
41 | #define NILFS_BTREE_ROOT_NCHILDREN_MAX \ |
42 | ((NILFS_BTREE_ROOT_SIZE - sizeof(struct nilfs_btree_node)) / \ |
43 | (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */))) |
44 | #define NILFS_BTREE_ROOT_NCHILDREN_MIN 0 |
45 | #define (sizeof(__le64)) |
46 | #define NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) \ |
47 | (((nodesize) - sizeof(struct nilfs_btree_node) - \ |
48 | NILFS_BTREE_NODE_EXTRA_PAD_SIZE) / \ |
49 | (sizeof(__le64 /* dkey */) + sizeof(__le64 /* dptr */))) |
50 | #define NILFS_BTREE_NODE_NCHILDREN_MIN(nodesize) \ |
51 | ((NILFS_BTREE_NODE_NCHILDREN_MAX(nodesize) - 1) / 2 + 1) |
52 | #define NILFS_BTREE_KEY_MIN ((__u64)0) |
53 | #define NILFS_BTREE_KEY_MAX (~(__u64)0) |
54 | |
55 | extern struct kmem_cache *nilfs_btree_path_cache; |
56 | |
57 | int nilfs_btree_init(struct nilfs_bmap *); |
58 | int nilfs_btree_convert_and_insert(struct nilfs_bmap *, __u64, __u64, |
59 | const __u64 *, const __u64 *, int); |
60 | void nilfs_btree_init_gc(struct nilfs_bmap *); |
61 | |
62 | int nilfs_btree_broken_node_block(struct buffer_head *bh); |
63 | |
64 | #endif /* _NILFS_BTREE_H */ |
65 | |