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Diffstat (limited to 'fs/hfs/btree.h')
| -rw-r--r-- | fs/hfs/btree.h | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/fs/hfs/btree.h b/fs/hfs/btree.h new file mode 100644 index 000000000..25ac9a8bb --- /dev/null +++ b/fs/hfs/btree.h @@ -0,0 +1,172 @@ +/* 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[0]; +}; + +#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). */ |