1/*
2 *   Copyright (C) International Business Machines Corp., 2000-2002
3 *
4 *   This program is free software;  you can redistribute it and/or modify
5 *   it under the terms of the GNU General Public License as published by
6 *   the Free Software Foundation; either version 2 of the License, or
7 *   (at your option) any later version.
8 *
9 *   This program is distributed in the hope that it will be useful,
10 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
11 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
12 *   the GNU General Public License for more details.
13 *
14 *   You should have received a copy of the GNU General Public License
15 *   along with this program;  if not, write to the Free Software
16 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 */
18#ifndef _H_JFS_XTREE
19#define _H_JFS_XTREE
20
21/*
22 *	jfs_xtree.h: extent allocation descriptor B+-tree manager
23 */
24
25#include "jfs_btree.h"
26
27
28/*
29 *	extent allocation descriptor (xad)
30 */
31typedef struct xad {
32	__u8 flag;	/* 1: flag */
33	__u8 rsvrd[2];	/* 2: reserved */
34	__u8 off1;	/* 1: offset in unit of fsblksize */
35	__le32 off2;	/* 4: offset in unit of fsblksize */
36	pxd_t loc;	/* 8: length and address in unit of fsblksize */
37} xad_t;			/* (16) */
38
39#define MAXXLEN		((1 << 24) - 1)
40
41#define XTSLOTSIZE	16
42#define L2XTSLOTSIZE	4
43
44/* xad_t field construction */
45#define XADoffset(xad, offset64)\
46{\
47	(xad)->off1 = ((u64)offset64) >> 32;\
48	(xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\
49}
50#define XADaddress(xad, address64) PXDaddress(&(xad)->loc, address64)
51#define XADlength(xad, length32) PXDlength(&(xad)->loc, length32)
52
53/* xad_t field extraction */
54#define offsetXAD(xad)\
55	( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))
56#define addressXAD(xad) addressPXD(&(xad)->loc)
57#define lengthXAD(xad) lengthPXD(&(xad)->loc)
58
59/* xad list */
60struct xadlist {
61	s16 maxnxad;
62	s16 nxad;
63	xad_t *xad;
64};
65
66/* xad_t flags */
67#define XAD_NEW		0x01	/* new */
68#define XAD_EXTENDED	0x02	/* extended */
69#define XAD_COMPRESSED	0x04	/* compressed with recorded length */
70#define XAD_NOTRECORDED 0x08	/* allocated but not recorded */
71#define XAD_COW		0x10	/* copy-on-write */
72
73
74/* possible values for maxentry */
75#define XTROOTINITSLOT_DIR 6
76#define XTROOTINITSLOT	10
77#define XTROOTMAXSLOT	18
78#define XTPAGEMAXSLOT	256
79#define XTENTRYSTART	2
80
81/*
82 *	xtree page:
83 */
84typedef union {
85	struct xtheader {
86		__le64 next;	/* 8: */
87		__le64 prev;	/* 8: */
88
89		u8 flag;	/* 1: */
90		u8 rsrvd1;	/* 1: */
91		__le16 nextindex;	/* 2: next index = number of entries */
92		__le16 maxentry;	/* 2: max number of entries */
93		__le16 rsrvd2;	/* 2: */
94
95		pxd_t self;	/* 8: self */
96	} header;		/* (32) */
97
98	xad_t xad[XTROOTMAXSLOT];	/* 16 * maxentry: xad array */
99} xtpage_t;
100
101/*
102 *	external declaration
103 */
104extern int xtLookup(struct inode *ip, s64 lstart, s64 llen,
105		    int *pflag, s64 * paddr, int *plen, int flag);
106extern void xtInitRoot(tid_t tid, struct inode *ip);
107extern int xtInsert(tid_t tid, struct inode *ip,
108		    int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
109extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
110		    int flag);
111#ifdef _NOTYET
112extern int xtTailgate(tid_t tid, struct inode *ip,
113		      s64 xoff, int xlen, s64 xaddr, int flag);
114#endif
115extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
116extern int xtDelete(tid_t tid, struct inode *ip, s64 xoff, int xlen,
117		    int flag);
118extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
119extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
120extern int xtRelocate(tid_t tid, struct inode *ip,
121		      xad_t * oxad, s64 nxaddr, int xtype);
122extern int xtAppend(tid_t tid,
123		    struct inode *ip, int xflag, s64 xoff, int maxblocks,
124		    int *xlenp, s64 * xaddrp, int flag);
125#endif				/* !_H_JFS_XTREE */
126