--- /dev/null
+/*
+ * 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
+
+/* 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 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). */
Code Review / kvmfornfv.git / blobdiff