| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * linux/fs/hfs/btree.h |
| * |
| * Copyright (C) 2001 |
| * Brad Boyer (flar@allandria.com) |
| * (C) 2003 Ardis Technologies <roman@ardistech.com> |
| */ |
| |
| #include "hfs_fs.h" |
| |
| typedef int (*btree_keycmp)(const btree_key *, const btree_key *); |
| |
| #define NODE_HASH_SIZE 256 |
| |
| /* B-tree mutex nested subclasses */ |
| enum hfs_btree_mutex_classes { |
| CATALOG_BTREE_MUTEX, |
| EXTENTS_BTREE_MUTEX, |
| ATTR_BTREE_MUTEX, |
| }; |
| |
| /* A HFS BTree held in memory */ |
| struct hfs_btree { |
| struct super_block *sb; |
| struct inode *inode; |
| btree_keycmp keycmp; |
| |
| u32 cnid; |
| u32 root; |
| u32 leaf_count; |
| u32 leaf_head; |
| u32 leaf_tail; |
| u32 node_count; |
| u32 free_nodes; |
| u32 attributes; |
| |
| unsigned int node_size; |
| unsigned int node_size_shift; |
| unsigned int max_key_len; |
| unsigned int depth; |
| |
| //unsigned int map1_size, map_size; |
| struct mutex tree_lock; |
| |
| unsigned int pages_per_bnode; |
| spinlock_t hash_lock; |
| struct hfs_bnode *node_hash[NODE_HASH_SIZE]; |
| int node_hash_cnt; |
| }; |
| |
| /* A HFS BTree node in memory */ |
| struct hfs_bnode { |
| struct hfs_btree *tree; |
| |
| u32 prev; |
| u32 this; |
| u32 next; |
| u32 parent; |
| |
| u16 num_recs; |
| u8 type; |
| u8 height; |
| |
| struct hfs_bnode *next_hash; |
| unsigned long flags; |
| wait_queue_head_t lock_wq; |
| atomic_t refcnt; |
| unsigned int page_offset; |
| struct page *page[]; |
| }; |
| |
| #define HFS_BNODE_ERROR 0 |
| #define HFS_BNODE_NEW 1 |
| #define HFS_BNODE_DELETED 2 |
| |
| struct hfs_find_data { |
| btree_key *key; |
| btree_key *search_key; |
| struct hfs_btree *tree; |
| struct hfs_bnode *bnode; |
| int record; |
| int keyoffset, keylength; |
| int entryoffset, entrylength; |
| }; |
| |
| |
| /* btree.c */ |
| extern struct hfs_btree *hfs_btree_open(struct super_block *, u32, btree_keycmp); |
| extern void hfs_btree_close(struct hfs_btree *); |
| extern void hfs_btree_write(struct hfs_btree *); |
| extern int hfs_bmap_reserve(struct hfs_btree *, int); |
| extern struct hfs_bnode * hfs_bmap_alloc(struct hfs_btree *); |
| extern void hfs_bmap_free(struct hfs_bnode *node); |
| |
| /* bnode.c */ |
| extern void hfs_bnode_read(struct hfs_bnode *, void *, int, int); |
| extern u16 hfs_bnode_read_u16(struct hfs_bnode *, int); |
| extern u8 hfs_bnode_read_u8(struct hfs_bnode *, int); |
| extern void hfs_bnode_read_key(struct hfs_bnode *, void *, int); |
| extern void hfs_bnode_write(struct hfs_bnode *, void *, int, int); |
| extern void hfs_bnode_write_u16(struct hfs_bnode *, int, u16); |
| extern void hfs_bnode_write_u8(struct hfs_bnode *, int, u8); |
| extern void hfs_bnode_clear(struct hfs_bnode *, int, int); |
| extern void hfs_bnode_copy(struct hfs_bnode *, int, |
| struct hfs_bnode *, int, int); |
| extern void hfs_bnode_move(struct hfs_bnode *, int, int, int); |
| extern void hfs_bnode_dump(struct hfs_bnode *); |
| extern void hfs_bnode_unlink(struct hfs_bnode *); |
| extern struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *, u32); |
| extern struct hfs_bnode *hfs_bnode_find(struct hfs_btree *, u32); |
| extern void hfs_bnode_unhash(struct hfs_bnode *); |
| extern void hfs_bnode_free(struct hfs_bnode *); |
| extern struct hfs_bnode *hfs_bnode_create(struct hfs_btree *, u32); |
| extern void hfs_bnode_get(struct hfs_bnode *); |
| extern void hfs_bnode_put(struct hfs_bnode *); |
| |
| /* brec.c */ |
| extern u16 hfs_brec_lenoff(struct hfs_bnode *, u16, u16 *); |
| extern u16 hfs_brec_keylen(struct hfs_bnode *, u16); |
| extern int hfs_brec_insert(struct hfs_find_data *, void *, int); |
| extern int hfs_brec_remove(struct hfs_find_data *); |
| |
| /* bfind.c */ |
| extern int hfs_find_init(struct hfs_btree *, struct hfs_find_data *); |
| extern void hfs_find_exit(struct hfs_find_data *); |
| extern int __hfs_brec_find(struct hfs_bnode *, struct hfs_find_data *); |
| extern int hfs_brec_find(struct hfs_find_data *); |
| extern int hfs_brec_read(struct hfs_find_data *, void *, int); |
| extern int hfs_brec_goto(struct hfs_find_data *, int); |
| |
| |
| struct hfs_bnode_desc { |
| __be32 next; /* (V) Number of the next node at this level */ |
| __be32 prev; /* (V) Number of the prev node at this level */ |
| u8 type; /* (F) The type of node */ |
| u8 height; /* (F) The level of this node (leaves=1) */ |
| __be16 num_recs; /* (V) The number of records in this node */ |
| u16 reserved; |
| } __packed; |
| |
| #define HFS_NODE_INDEX 0x00 /* An internal (index) node */ |
| #define HFS_NODE_HEADER 0x01 /* The tree header node (node 0) */ |
| #define HFS_NODE_MAP 0x02 /* Holds part of the bitmap of used nodes */ |
| #define HFS_NODE_LEAF 0xFF /* A leaf (ndNHeight==1) node */ |
| |
| struct hfs_btree_header_rec { |
| __be16 depth; /* (V) The number of levels in this B-tree */ |
| __be32 root; /* (V) The node number of the root node */ |
| __be32 leaf_count; /* (V) The number of leaf records */ |
| __be32 leaf_head; /* (V) The number of the first leaf node */ |
| __be32 leaf_tail; /* (V) The number of the last leaf node */ |
| __be16 node_size; /* (F) The number of bytes in a node (=512) */ |
| __be16 max_key_len; /* (F) The length of a key in an index node */ |
| __be32 node_count; /* (V) The total number of nodes */ |
| __be32 free_nodes; /* (V) The number of unused nodes */ |
| u16 reserved1; |
| __be32 clump_size; /* (F) clump size. not usually used. */ |
| u8 btree_type; /* (F) BTree type */ |
| u8 reserved2; |
| __be32 attributes; /* (F) attributes */ |
| u32 reserved3[16]; |
| } __packed; |
| |
| #define BTREE_ATTR_BADCLOSE 0x00000001 /* b-tree not closed properly. not |
| used by hfsplus. */ |
| #define HFS_TREE_BIGKEYS 0x00000002 /* key length is u16 instead of u8. |
| used by hfsplus. */ |
| #define HFS_TREE_VARIDXKEYS 0x00000004 /* variable key length instead of |
| max key length. use din catalog |
| b-tree but not in extents |
| b-tree (hfsplus). */ |
