1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 *   Copyright (C) International Business Machines Corp., 2000-2002
4 */
5#ifndef _H_JFS_XTREE
6#define _H_JFS_XTREE
7
8/*
9 *	jfs_xtree.h: extent allocation descriptor B+-tree manager
10 */
11
12#include "jfs_btree.h"
13
14
15/*
16 *	extent allocation descriptor (xad)
17 */
18typedef struct xad {
19	__u8 flag;	/* 1: flag */
20	__u8 rsvrd[2];	/* 2: reserved */
21	__u8 off1;	/* 1: offset in unit of fsblksize */
22	__le32 off2;	/* 4: offset in unit of fsblksize */
23	pxd_t loc;	/* 8: length and address in unit of fsblksize */
24} xad_t;			/* (16) */
25
26#define MAXXLEN		((1 << 24) - 1)
27
28#define XTSLOTSIZE	16
29#define L2XTSLOTSIZE	4
30
31/* xad_t field construction */
32#define XADoffset(xad, offset64)\
33{\
34	(xad)->off1 = ((u64)offset64) >> 32;\
35	(xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\
36}
37#define XADaddress(xad, address64) PXDaddress(&(xad)->loc, address64)
38#define XADlength(xad, length32) PXDlength(&(xad)->loc, length32)
39
40/* xad_t field extraction */
41#define offsetXAD(xad)\
42	( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))
43#define addressXAD(xad) addressPXD(&(xad)->loc)
44#define lengthXAD(xad) lengthPXD(&(xad)->loc)
45
46/* xad list */
47struct xadlist {
48	s16 maxnxad;
49	s16 nxad;
50	xad_t *xad;
51};
52
53/* xad_t flags */
54#define XAD_NEW		0x01	/* new */
55#define XAD_EXTENDED	0x02	/* extended */
56#define XAD_COMPRESSED	0x04	/* compressed with recorded length */
57#define XAD_NOTRECORDED 0x08	/* allocated but not recorded */
58#define XAD_COW		0x10	/* copy-on-write */
59
60
61/* possible values for maxentry */
62#define XTROOTINITSLOT_DIR 6
63#define XTROOTINITSLOT	10
64#define XTROOTMAXSLOT	18
65#define XTPAGEMAXSLOT	256
66#define XTENTRYSTART	2
67
68struct xtheader {
69	__le64 next;	/* 8: */
70	__le64 prev;	/* 8: */
71
72	u8 flag;	/* 1: */
73	u8 rsrvd1;	/* 1: */
74	__le16 nextindex;	/* 2: next index = number of entries */
75	__le16 maxentry;	/* 2: max number of entries */
76	__le16 rsrvd2;	/* 2: */
77
78	pxd_t self;	/* 8: self */
79};
80
81/*
82 *	xtree root (in inode):
83 */
84typedef union {
85	struct xtheader header;
86	xad_t xad[XTROOTMAXSLOT];	/* 16 * maxentry: xad array */
87} xtroot_t;
88
89/*
90 *	xtree page:
91 */
92typedef union {
93	struct xtheader header;
94	xad_t xad[XTPAGEMAXSLOT];	/* 16 * maxentry: xad array */
95} xtpage_t;
96
97/*
98 *	external declaration
99 */
100extern int xtLookup(struct inode *ip, s64 lstart, s64 llen,
101		    int *pflag, s64 * paddr, int *plen, int flag);
102extern void xtInitRoot(tid_t tid, struct inode *ip);
103extern int xtInsert(tid_t tid, struct inode *ip,
104		    int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
105extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
106		    int flag);
107extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
108extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
109extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
110extern int xtAppend(tid_t tid,
111		    struct inode *ip, int xflag, s64 xoff, int maxblocks,
112		    int *xlenp, s64 * xaddrp, int flag);
113#endif				/* !_H_JFS_XTREE */
114