1 /* 2 * linux/fs/hfs/btree.h 3 * 4 * Copyright (C) 2001 5 * Brad Boyer (flar@allandria.com) 6 * (C) 2003 Ardis Technologies <roman@ardistech.com> 7 */ 8 9 #include "hfs_fs.h" 10 11 typedef int (*btree_keycmp)(const btree_key *, const btree_key *); 12 13 #define NODE_HASH_SIZE 256 14 15 /* A HFS BTree held in memory */ 16 struct hfs_btree { 17 struct super_block *sb; 18 struct inode *inode; 19 btree_keycmp keycmp; 20 21 u32 cnid; 22 u32 root; 23 u32 leaf_count; 24 u32 leaf_head; 25 u32 leaf_tail; 26 u32 node_count; 27 u32 free_nodes; 28 u32 attributes; 29 30 unsigned int node_size; 31 unsigned int node_size_shift; 32 unsigned int max_key_len; 33 unsigned int depth; 34 35 //unsigned int map1_size, map_size; 36 struct mutex tree_lock; 37 38 unsigned int pages_per_bnode; 39 spinlock_t hash_lock; 40 struct hfs_bnode *node_hash[NODE_HASH_SIZE]; 41 int node_hash_cnt; 42 }; 43 44 /* A HFS BTree node in memory */ 45 struct hfs_bnode { 46 struct hfs_btree *tree; 47 48 u32 prev; 49 u32 this; 50 u32 next; 51 u32 parent; 52 53 u16 num_recs; 54 u8 type; 55 u8 height; 56 57 struct hfs_bnode *next_hash; 58 unsigned long flags; 59 wait_queue_head_t lock_wq; 60 atomic_t refcnt; 61 unsigned int page_offset; 62 struct page *page[0]; 63 }; 64 65 #define HFS_BNODE_ERROR 0 66 #define HFS_BNODE_NEW 1 67 #define HFS_BNODE_DELETED 2 68 69 struct hfs_find_data { 70 btree_key *key; 71 btree_key *search_key; 72 struct hfs_btree *tree; 73 struct hfs_bnode *bnode; 74 int record; 75 int keyoffset, keylength; 76 int entryoffset, entrylength; 77 }; 78 79 80 /* btree.c */ 81 extern struct hfs_btree *hfs_btree_open(struct super_block *, u32, btree_keycmp); 82 extern void hfs_btree_close(struct hfs_btree *); 83 extern void hfs_btree_write(struct hfs_btree *); 84 extern struct hfs_bnode * hfs_bmap_alloc(struct hfs_btree *); 85 extern void hfs_bmap_free(struct hfs_bnode *node); 86 87 /* bnode.c */ 88 extern void hfs_bnode_read(struct hfs_bnode *, void *, int, int); 89 extern u16 hfs_bnode_read_u16(struct hfs_bnode *, int); 90 extern u8 hfs_bnode_read_u8(struct hfs_bnode *, int); 91 extern void hfs_bnode_read_key(struct hfs_bnode *, void *, int); 92 extern void hfs_bnode_write(struct hfs_bnode *, void *, int, int); 93 extern void hfs_bnode_write_u16(struct hfs_bnode *, int, u16); 94 extern void hfs_bnode_write_u8(struct hfs_bnode *, int, u8); 95 extern void hfs_bnode_clear(struct hfs_bnode *, int, int); 96 extern void hfs_bnode_copy(struct hfs_bnode *, int, 97 struct hfs_bnode *, int, int); 98 extern void hfs_bnode_move(struct hfs_bnode *, int, int, int); 99 extern void hfs_bnode_dump(struct hfs_bnode *); 100 extern void hfs_bnode_unlink(struct hfs_bnode *); 101 extern struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *, u32); 102 extern struct hfs_bnode *hfs_bnode_find(struct hfs_btree *, u32); 103 extern void hfs_bnode_unhash(struct hfs_bnode *); 104 extern void hfs_bnode_free(struct hfs_bnode *); 105 extern struct hfs_bnode *hfs_bnode_create(struct hfs_btree *, u32); 106 extern void hfs_bnode_get(struct hfs_bnode *); 107 extern void hfs_bnode_put(struct hfs_bnode *); 108 109 /* brec.c */ 110 extern u16 hfs_brec_lenoff(struct hfs_bnode *, u16, u16 *); 111 extern u16 hfs_brec_keylen(struct hfs_bnode *, u16); 112 extern int hfs_brec_insert(struct hfs_find_data *, void *, int); 113 extern int hfs_brec_remove(struct hfs_find_data *); 114 115 /* bfind.c */ 116 extern int hfs_find_init(struct hfs_btree *, struct hfs_find_data *); 117 extern void hfs_find_exit(struct hfs_find_data *); 118 extern int __hfs_brec_find(struct hfs_bnode *, struct hfs_find_data *); 119 extern int hfs_brec_find(struct hfs_find_data *); 120 extern int hfs_brec_read(struct hfs_find_data *, void *, int); 121 extern int hfs_brec_goto(struct hfs_find_data *, int); 122 123 124 struct hfs_bnode_desc { 125 __be32 next; /* (V) Number of the next node at this level */ 126 __be32 prev; /* (V) Number of the prev node at this level */ 127 u8 type; /* (F) The type of node */ 128 u8 height; /* (F) The level of this node (leaves=1) */ 129 __be16 num_recs; /* (V) The number of records in this node */ 130 u16 reserved; 131 } __packed; 132 133 #define HFS_NODE_INDEX 0x00 /* An internal (index) node */ 134 #define HFS_NODE_HEADER 0x01 /* The tree header node (node 0) */ 135 #define HFS_NODE_MAP 0x02 /* Holds part of the bitmap of used nodes */ 136 #define HFS_NODE_LEAF 0xFF /* A leaf (ndNHeight==1) node */ 137 138 struct hfs_btree_header_rec { 139 __be16 depth; /* (V) The number of levels in this B-tree */ 140 __be32 root; /* (V) The node number of the root node */ 141 __be32 leaf_count; /* (V) The number of leaf records */ 142 __be32 leaf_head; /* (V) The number of the first leaf node */ 143 __be32 leaf_tail; /* (V) The number of the last leaf node */ 144 __be16 node_size; /* (F) The number of bytes in a node (=512) */ 145 __be16 max_key_len; /* (F) The length of a key in an index node */ 146 __be32 node_count; /* (V) The total number of nodes */ 147 __be32 free_nodes; /* (V) The number of unused nodes */ 148 u16 reserved1; 149 __be32 clump_size; /* (F) clump size. not usually used. */ 150 u8 btree_type; /* (F) BTree type */ 151 u8 reserved2; 152 __be32 attributes; /* (F) attributes */ 153 u32 reserved3[16]; 154 } __packed; 155 156 #define HFS_NODE_INDEX 0x00 /* An internal (index) node */ 157 #define HFS_NODE_HEADER 0x01 /* The tree header node (node 0) */ 158 #define HFS_NODE_MAP 0x02 /* Holds part of the bitmap of used nodes */ 159 #define HFS_NODE_LEAF 0xFF /* A leaf (ndNHeight==1) node */ 160 161 #define BTREE_ATTR_BADCLOSE 0x00000001 /* b-tree not closed properly. not 162 used by hfsplus. */ 163 #define HFS_TREE_BIGKEYS 0x00000002 /* key length is u16 instead of u8. 164 used by hfsplus. */ 165 #define HFS_TREE_VARIDXKEYS 0x00000004 /* variable key length instead of 166 max key length. use din catalog 167 b-tree but not in extents 168 b-tree (hfsplus). */ 169