1 /* SPDX-License-Identifier: GPL-2.0 */ 2 /* 3 * linux/fs/hfs/btree.h 4 * 5 * Copyright (C) 2001 6 * Brad Boyer (flar@allandria.com) 7 * (C) 2003 Ardis Technologies <roman@ardistech.com> 8 */ 9 10 #include "hfs_fs.h" 11 12 typedef int (*btree_keycmp)(const btree_key *, const btree_key *); 13 14 #define NODE_HASH_SIZE 256 15 16 /* A HFS BTree held in memory */ 17 struct hfs_btree { 18 struct super_block *sb; 19 struct inode *inode; 20 btree_keycmp keycmp; 21 22 u32 cnid; 23 u32 root; 24 u32 leaf_count; 25 u32 leaf_head; 26 u32 leaf_tail; 27 u32 node_count; 28 u32 free_nodes; 29 u32 attributes; 30 31 unsigned int node_size; 32 unsigned int node_size_shift; 33 unsigned int max_key_len; 34 unsigned int depth; 35 36 //unsigned int map1_size, map_size; 37 struct mutex tree_lock; 38 39 unsigned int pages_per_bnode; 40 spinlock_t hash_lock; 41 struct hfs_bnode *node_hash[NODE_HASH_SIZE]; 42 int node_hash_cnt; 43 }; 44 45 /* A HFS BTree node in memory */ 46 struct hfs_bnode { 47 struct hfs_btree *tree; 48 49 u32 prev; 50 u32 this; 51 u32 next; 52 u32 parent; 53 54 u16 num_recs; 55 u8 type; 56 u8 height; 57 58 struct hfs_bnode *next_hash; 59 unsigned long flags; 60 wait_queue_head_t lock_wq; 61 atomic_t refcnt; 62 unsigned int page_offset; 63 struct page *page[0]; 64 }; 65 66 #define HFS_BNODE_ERROR 0 67 #define HFS_BNODE_NEW 1 68 #define HFS_BNODE_DELETED 2 69 70 struct hfs_find_data { 71 btree_key *key; 72 btree_key *search_key; 73 struct hfs_btree *tree; 74 struct hfs_bnode *bnode; 75 int record; 76 int keyoffset, keylength; 77 int entryoffset, entrylength; 78 }; 79 80 81 /* btree.c */ 82 extern struct hfs_btree *hfs_btree_open(struct super_block *, u32, btree_keycmp); 83 extern void hfs_btree_close(struct hfs_btree *); 84 extern void hfs_btree_write(struct hfs_btree *); 85 extern struct hfs_bnode * hfs_bmap_alloc(struct hfs_btree *); 86 extern void hfs_bmap_free(struct hfs_bnode *node); 87 88 /* bnode.c */ 89 extern void hfs_bnode_read(struct hfs_bnode *, void *, int, int); 90 extern u16 hfs_bnode_read_u16(struct hfs_bnode *, int); 91 extern u8 hfs_bnode_read_u8(struct hfs_bnode *, int); 92 extern void hfs_bnode_read_key(struct hfs_bnode *, void *, int); 93 extern void hfs_bnode_write(struct hfs_bnode *, void *, int, int); 94 extern void hfs_bnode_write_u16(struct hfs_bnode *, int, u16); 95 extern void hfs_bnode_write_u8(struct hfs_bnode *, int, u8); 96 extern void hfs_bnode_clear(struct hfs_bnode *, int, int); 97 extern void hfs_bnode_copy(struct hfs_bnode *, int, 98 struct hfs_bnode *, int, int); 99 extern void hfs_bnode_move(struct hfs_bnode *, int, int, int); 100 extern void hfs_bnode_dump(struct hfs_bnode *); 101 extern void hfs_bnode_unlink(struct hfs_bnode *); 102 extern struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *, u32); 103 extern struct hfs_bnode *hfs_bnode_find(struct hfs_btree *, u32); 104 extern void hfs_bnode_unhash(struct hfs_bnode *); 105 extern void hfs_bnode_free(struct hfs_bnode *); 106 extern struct hfs_bnode *hfs_bnode_create(struct hfs_btree *, u32); 107 extern void hfs_bnode_get(struct hfs_bnode *); 108 extern void hfs_bnode_put(struct hfs_bnode *); 109 110 /* brec.c */ 111 extern u16 hfs_brec_lenoff(struct hfs_bnode *, u16, u16 *); 112 extern u16 hfs_brec_keylen(struct hfs_bnode *, u16); 113 extern int hfs_brec_insert(struct hfs_find_data *, void *, int); 114 extern int hfs_brec_remove(struct hfs_find_data *); 115 116 /* bfind.c */ 117 extern int hfs_find_init(struct hfs_btree *, struct hfs_find_data *); 118 extern void hfs_find_exit(struct hfs_find_data *); 119 extern int __hfs_brec_find(struct hfs_bnode *, struct hfs_find_data *); 120 extern int hfs_brec_find(struct hfs_find_data *); 121 extern int hfs_brec_read(struct hfs_find_data *, void *, int); 122 extern int hfs_brec_goto(struct hfs_find_data *, int); 123 124 125 struct hfs_bnode_desc { 126 __be32 next; /* (V) Number of the next node at this level */ 127 __be32 prev; /* (V) Number of the prev node at this level */ 128 u8 type; /* (F) The type of node */ 129 u8 height; /* (F) The level of this node (leaves=1) */ 130 __be16 num_recs; /* (V) The number of records in this node */ 131 u16 reserved; 132 } __packed; 133 134 #define HFS_NODE_INDEX 0x00 /* An internal (index) node */ 135 #define HFS_NODE_HEADER 0x01 /* The tree header node (node 0) */ 136 #define HFS_NODE_MAP 0x02 /* Holds part of the bitmap of used nodes */ 137 #define HFS_NODE_LEAF 0xFF /* A leaf (ndNHeight==1) node */ 138 139 struct hfs_btree_header_rec { 140 __be16 depth; /* (V) The number of levels in this B-tree */ 141 __be32 root; /* (V) The node number of the root node */ 142 __be32 leaf_count; /* (V) The number of leaf records */ 143 __be32 leaf_head; /* (V) The number of the first leaf node */ 144 __be32 leaf_tail; /* (V) The number of the last leaf node */ 145 __be16 node_size; /* (F) The number of bytes in a node (=512) */ 146 __be16 max_key_len; /* (F) The length of a key in an index node */ 147 __be32 node_count; /* (V) The total number of nodes */ 148 __be32 free_nodes; /* (V) The number of unused nodes */ 149 u16 reserved1; 150 __be32 clump_size; /* (F) clump size. not usually used. */ 151 u8 btree_type; /* (F) BTree type */ 152 u8 reserved2; 153 __be32 attributes; /* (F) attributes */ 154 u32 reserved3[16]; 155 } __packed; 156 157 #define BTREE_ATTR_BADCLOSE 0x00000001 /* b-tree not closed properly. not 158 used by hfsplus. */ 159 #define HFS_TREE_BIGKEYS 0x00000002 /* key length is u16 instead of u8. 160 used by hfsplus. */ 161 #define HFS_TREE_VARIDXKEYS 0x00000004 /* variable key length instead of 162 max key length. use din catalog 163 b-tree but not in extents 164 b-tree (hfsplus). */ 165