Linux Audio

Check our new training course

Linux kernel drivers training

Mar 31-Apr 9, 2025, special US time zones
Register
Loading...
v6.13.7
  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
 12typedef int (*btree_keycmp)(const btree_key *, const btree_key *);
 13
 14#define NODE_HASH_SIZE  256
 15
 16/* B-tree mutex nested subclasses */
 17enum 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 */
 24struct 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 */
 53struct 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
 77struct 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 */
 89extern struct hfs_btree *hfs_btree_open(struct super_block *, u32, btree_keycmp);
 90extern void hfs_btree_close(struct hfs_btree *);
 91extern void hfs_btree_write(struct hfs_btree *);
 92extern int hfs_bmap_reserve(struct hfs_btree *, int);
 93extern struct hfs_bnode * hfs_bmap_alloc(struct hfs_btree *);
 94extern void hfs_bmap_free(struct hfs_bnode *node);
 95
 96/* bnode.c */
 97extern void hfs_bnode_read(struct hfs_bnode *, void *, int, int);
 98extern u16 hfs_bnode_read_u16(struct hfs_bnode *, int);
 99extern u8 hfs_bnode_read_u8(struct hfs_bnode *, int);
100extern void hfs_bnode_read_key(struct hfs_bnode *, void *, int);
101extern void hfs_bnode_write(struct hfs_bnode *, void *, int, int);
102extern void hfs_bnode_write_u16(struct hfs_bnode *, int, u16);
103extern void hfs_bnode_write_u8(struct hfs_bnode *, int, u8);
104extern void hfs_bnode_clear(struct hfs_bnode *, int, int);
105extern void hfs_bnode_copy(struct hfs_bnode *, int,
106			   struct hfs_bnode *, int, int);
107extern void hfs_bnode_move(struct hfs_bnode *, int, int, int);
108extern void hfs_bnode_dump(struct hfs_bnode *);
109extern void hfs_bnode_unlink(struct hfs_bnode *);
110extern struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *, u32);
111extern struct hfs_bnode *hfs_bnode_find(struct hfs_btree *, u32);
112extern void hfs_bnode_unhash(struct hfs_bnode *);
113extern void hfs_bnode_free(struct hfs_bnode *);
114extern struct hfs_bnode *hfs_bnode_create(struct hfs_btree *, u32);
115extern void hfs_bnode_get(struct hfs_bnode *);
116extern void hfs_bnode_put(struct hfs_bnode *);
117
118/* brec.c */
119extern u16 hfs_brec_lenoff(struct hfs_bnode *, u16, u16 *);
120extern u16 hfs_brec_keylen(struct hfs_bnode *, u16);
121extern int hfs_brec_insert(struct hfs_find_data *, void *, int);
122extern int hfs_brec_remove(struct hfs_find_data *);
123
124/* bfind.c */
125extern int hfs_find_init(struct hfs_btree *, struct hfs_find_data *);
126extern void hfs_find_exit(struct hfs_find_data *);
127extern int __hfs_brec_find(struct hfs_bnode *, struct hfs_find_data *);
128extern int hfs_brec_find(struct hfs_find_data *);
129extern int hfs_brec_read(struct hfs_find_data *, void *, int);
130extern int hfs_brec_goto(struct hfs_find_data *, int);
131
132
133struct hfs_bnode_desc {
134	__be32 next;		/* (V) Number of the next node at this level */
135	__be32 prev;		/* (V) Number of the prev node at this level */
136	u8 type;		/* (F) The type of node */
137	u8 height;		/* (F) The level of this node (leaves=1) */
138	__be16 num_recs;	/* (V) The number of records in this node */
139	u16 reserved;
140} __packed;
141
142#define HFS_NODE_INDEX	0x00	/* An internal (index) node */
143#define HFS_NODE_HEADER	0x01	/* The tree header node (node 0) */
144#define HFS_NODE_MAP	0x02	/* Holds part of the bitmap of used nodes */
145#define HFS_NODE_LEAF	0xFF	/* A leaf (ndNHeight==1) node */
146
147struct hfs_btree_header_rec {
148	__be16 depth;		/* (V) The number of levels in this B-tree */
149	__be32 root;		/* (V) The node number of the root node */
150	__be32 leaf_count;	/* (V) The number of leaf records */
151	__be32 leaf_head;	/* (V) The number of the first leaf node */
152	__be32 leaf_tail;	/* (V) The number of the last leaf node */
153	__be16 node_size;	/* (F) The number of bytes in a node (=512) */
154	__be16 max_key_len;	/* (F) The length of a key in an index node */
155	__be32 node_count;	/* (V) The total number of nodes */
156	__be32 free_nodes;	/* (V) The number of unused nodes */
157	u16 reserved1;
158	__be32 clump_size;	/* (F) clump size. not usually used. */
159	u8 btree_type;		/* (F) BTree type */
160	u8 reserved2;
161	__be32 attributes;	/* (F) attributes */
162	u32 reserved3[16];
163} __packed;
164
165#define BTREE_ATTR_BADCLOSE	0x00000001	/* b-tree not closed properly. not
166						   used by hfsplus. */
167#define HFS_TREE_BIGKEYS	0x00000002	/* key length is u16 instead of u8.
168						   used by hfsplus. */
169#define HFS_TREE_VARIDXKEYS	0x00000004	/* variable key length instead of
170						   max key length. use din catalog
171						   b-tree but not in extents
172						   b-tree (hfsplus). */
v6.8
  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
 12typedef int (*btree_keycmp)(const btree_key *, const btree_key *);
 13
 14#define NODE_HASH_SIZE  256
 15
 16/* B-tree mutex nested subclasses */
 17enum 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 */
 24struct 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 */
 53struct 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
 77struct 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 */
 89extern struct hfs_btree *hfs_btree_open(struct super_block *, u32, btree_keycmp);
 90extern void hfs_btree_close(struct hfs_btree *);
 91extern void hfs_btree_write(struct hfs_btree *);
 92extern int hfs_bmap_reserve(struct hfs_btree *, int);
 93extern struct hfs_bnode * hfs_bmap_alloc(struct hfs_btree *);
 94extern void hfs_bmap_free(struct hfs_bnode *node);
 95
 96/* bnode.c */
 97extern void hfs_bnode_read(struct hfs_bnode *, void *, int, int);
 98extern u16 hfs_bnode_read_u16(struct hfs_bnode *, int);
 99extern u8 hfs_bnode_read_u8(struct hfs_bnode *, int);
100extern void hfs_bnode_read_key(struct hfs_bnode *, void *, int);
101extern void hfs_bnode_write(struct hfs_bnode *, void *, int, int);
102extern void hfs_bnode_write_u16(struct hfs_bnode *, int, u16);
103extern void hfs_bnode_write_u8(struct hfs_bnode *, int, u8);
104extern void hfs_bnode_clear(struct hfs_bnode *, int, int);
105extern void hfs_bnode_copy(struct hfs_bnode *, int,
106			   struct hfs_bnode *, int, int);
107extern void hfs_bnode_move(struct hfs_bnode *, int, int, int);
108extern void hfs_bnode_dump(struct hfs_bnode *);
109extern void hfs_bnode_unlink(struct hfs_bnode *);
110extern struct hfs_bnode *hfs_bnode_findhash(struct hfs_btree *, u32);
111extern struct hfs_bnode *hfs_bnode_find(struct hfs_btree *, u32);
112extern void hfs_bnode_unhash(struct hfs_bnode *);
113extern void hfs_bnode_free(struct hfs_bnode *);
114extern struct hfs_bnode *hfs_bnode_create(struct hfs_btree *, u32);
115extern void hfs_bnode_get(struct hfs_bnode *);
116extern void hfs_bnode_put(struct hfs_bnode *);
117
118/* brec.c */
119extern u16 hfs_brec_lenoff(struct hfs_bnode *, u16, u16 *);
120extern u16 hfs_brec_keylen(struct hfs_bnode *, u16);
121extern int hfs_brec_insert(struct hfs_find_data *, void *, int);
122extern int hfs_brec_remove(struct hfs_find_data *);
123
124/* bfind.c */
125extern int hfs_find_init(struct hfs_btree *, struct hfs_find_data *);
126extern void hfs_find_exit(struct hfs_find_data *);
127extern int __hfs_brec_find(struct hfs_bnode *, struct hfs_find_data *);
128extern int hfs_brec_find(struct hfs_find_data *);
129extern int hfs_brec_read(struct hfs_find_data *, void *, int);
130extern int hfs_brec_goto(struct hfs_find_data *, int);
131
132
133struct hfs_bnode_desc {
134	__be32 next;		/* (V) Number of the next node at this level */
135	__be32 prev;		/* (V) Number of the prev node at this level */
136	u8 type;		/* (F) The type of node */
137	u8 height;		/* (F) The level of this node (leaves=1) */
138	__be16 num_recs;	/* (V) The number of records in this node */
139	u16 reserved;
140} __packed;
141
142#define HFS_NODE_INDEX	0x00	/* An internal (index) node */
143#define HFS_NODE_HEADER	0x01	/* The tree header node (node 0) */
144#define HFS_NODE_MAP	0x02	/* Holds part of the bitmap of used nodes */
145#define HFS_NODE_LEAF	0xFF	/* A leaf (ndNHeight==1) node */
146
147struct hfs_btree_header_rec {
148	__be16 depth;		/* (V) The number of levels in this B-tree */
149	__be32 root;		/* (V) The node number of the root node */
150	__be32 leaf_count;	/* (V) The number of leaf records */
151	__be32 leaf_head;	/* (V) The number of the first leaf node */
152	__be32 leaf_tail;	/* (V) The number of the last leaf node */
153	__be16 node_size;	/* (F) The number of bytes in a node (=512) */
154	__be16 max_key_len;	/* (F) The length of a key in an index node */
155	__be32 node_count;	/* (V) The total number of nodes */
156	__be32 free_nodes;	/* (V) The number of unused nodes */
157	u16 reserved1;
158	__be32 clump_size;	/* (F) clump size. not usually used. */
159	u8 btree_type;		/* (F) BTree type */
160	u8 reserved2;
161	__be32 attributes;	/* (F) attributes */
162	u32 reserved3[16];
163} __packed;
164
165#define BTREE_ATTR_BADCLOSE	0x00000001	/* b-tree not closed properly. not
166						   used by hfsplus. */
167#define HFS_TREE_BIGKEYS	0x00000002	/* key length is u16 instead of u8.
168						   used by hfsplus. */
169#define HFS_TREE_VARIDXKEYS	0x00000004	/* variable key length instead of
170						   max key length. use din catalog
171						   b-tree but not in extents
172						   b-tree (hfsplus). */