forked from Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
172 lines
5.3 KiB
172 lines
5.3 KiB
/* SPDX-License-Identifier: GPL-2.0 */ |
|
/* |
|
* linux/fs/hfs/btree.h |
|
* |
|
* Copyright (C) 2001 |
|
* Brad Boyer ([email protected]) |
|
* (C) 2003 Ardis Technologies <[email protected]> |
|
*/ |
|
|
|
#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). */
|
|
|