mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-15 00:04:15 +08:00
5e01fdff04
There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.9-rc1/process/deprecated.html#zero-length-and-one-element-arrays Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
166 lines
5.2 KiB
C
166 lines
5.2 KiB
C
/* 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
|
|
|
|
/* 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). */
|