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 /* B-tree mutex nested subclasses */ 17 enum hfs_btree_mutex_classes { 18 CATALOG_BTREE_MUTEX, 19 EXTENTS_BTREE_MUTEX, 20 ATTR_BTREE_MUTEX, 21 }; 22 23 /* A HFS BTree held in memory */ 24 struct hfs_btree { 25 struct super_block *sb; 26 struct inode *inode; 27 btree_keycmp keycmp; 28 29 u32 cnid; 30 u32 root; 31 u32 leaf_count; 32 u32 leaf_head; 33 u32 leaf_tail; 34 u32 node_count; 35 u32 free_nodes; 36 u32 attributes; 37 38 unsigned int node_size; 39 unsigned int node_size_shift; 40 unsigned int max_key_len; 41 unsigned int depth; 42 43 //unsigned int map1_size, map_size; 44 struct mutex tree_lock; 45 46 unsigned int pages_per_bnode; 47 spinlock_t hash_lock; 48 struct hfs_bnode *node_hash[NODE_HASH_SIZE]; 49 int node_hash_cnt; 50 }; 51 52 /* A HFS BTree node in memory */ 53 struct hfs_bnode { 54 struct hfs_btree *tree; 55 56 u32 prev; 57 u32 this; 58 u32 next; 59 u32 parent; 60 61 u16 num_recs; 62 u8 type; 63 u8 height; 64 65 struct hfs_bnode *next_hash; 66 unsigned long flags; 67 wait_queue_head_t lock_wq; 68 atomic_t refcnt; 69 unsigned int page_offset; 70 struct page *page[]; 71 }; 72 73 #define HFS_BNODE_ERROR 0 74 #define HFS_BNODE_NEW 1 75 #define HFS_BNODE_DELETED 2 76 77 struct hfs_find_data { 78 btree_key *key; 79 btree_key *search_key; 80 struct hfs_btree *tree; 81 struct hfs_bnode *bnode; 82 int record; 83 int keyoffset, keylength; 84 int entryoffset, entrylength; 85 }; 86 87 88 /* btree.c */ 89 extern struct hfs_btree *hfs_btree_open(struct super_block *sb, u32 id, 90 btree_keycmp keycmp); 91 extern void hfs_btree_close(struct hfs_btree *tree); 92 extern void hfs_btree_write(struct hfs_btree *tree); 93 extern int hfs_bmap_reserve(struct hfs_btree *tree, u32 rsvd_nodes); 94 extern struct hfs_bnode *hfs_bmap_alloc(struct hfs_btree *tree); 95 extern void hfs_bmap_free(struct hfs_bnode *node); 96 97 /* bnode.c */ 98 extern void hfs_bnode_read(struct hfs_bnode *node, void *buf, u32 off, u32 len); 99 extern u16 hfs_bnode_read_u16(struct hfs_bnode *node, u32 off); 100 extern u8 hfs_bnode_read_u8(struct hfs_bnode *node, u32 off); 101 extern void hfs_bnode_read_key(struct hfs_bnode *node, void *key, u32 off); 102 extern void hfs_bnode_write(struct hfs_bnode *node, void *buf, u32 off, u32 len); 103 extern void hfs_bnode_write_u16(struct hfs_bnode *node, u32 off, u16 data); 104 extern void hfs_bnode_write_u8(struct hfs_bnode *node, u32 off, u8 data); 105 extern void hfs_bnode_clear(struct hfs_bnode *node, u32 off, u32 len); 106 extern void hfs_bnode_copy(struct hfs_bnode *dst_node, u32 dst, 107 struct hfs_bnode *src_node, u32 src, u32 len); 108 extern void hfs_bnode_move(struct hfs_bnode *node, u32 dst, u32 src, u32 len); 109 extern void hfs_bnode_dump(struct hfs_bnode *node); 110 extern void hfs_bnode_unlink(struct hfs_bnode *node); 111 extern struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *tree, u32 cnid); 112 extern struct hfs_bnode *hfs_bnode_find(struct hfs_btree *tree, u32 num); 113 extern void hfs_bnode_unhash(struct hfs_bnode *node); 114 extern void hfs_bnode_free(struct hfs_bnode *node); 115 extern struct hfs_bnode *hfs_bnode_create(struct hfs_btree *tree, u32 num); 116 extern void hfs_bnode_get(struct hfs_bnode *node); 117 extern void hfs_bnode_put(struct hfs_bnode *node); 118 119 /* brec.c */ 120 extern u16 hfs_brec_lenoff(struct hfs_bnode *node, u16 rec, u16 *off); 121 extern u16 hfs_brec_keylen(struct hfs_bnode *node, u16 rec); 122 extern int hfs_brec_insert(struct hfs_find_data *fd, void *entry, u32 entry_len); 123 extern int hfs_brec_remove(struct hfs_find_data *fd); 124 125 /* bfind.c */ 126 extern int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd); 127 extern void hfs_find_exit(struct hfs_find_data *fd); 128 extern int __hfs_brec_find(struct hfs_bnode *bnode, struct hfs_find_data *fd); 129 extern int hfs_brec_find(struct hfs_find_data *fd); 130 extern int hfs_brec_read(struct hfs_find_data *fd, void *rec, u32 rec_len); 131 extern int hfs_brec_goto(struct hfs_find_data *fd, int cnt); 132