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	unsigned flag:8;	/* 1: flag */
33	unsigned rsvrd:16;	/* 2: reserved */
34	unsigned off1:8;	/* 1: offset in unit of fsblksize */
35	__le32 off2;		/* 4: offset in unit of fsblksize */
36	unsigned len:24;	/* 3: length in unit of fsblksize */
37	unsigned addr1:8;	/* 1: address in unit of fsblksize */
38	__le32 addr2;		/* 4: address in unit of fsblksize */
39} xad_t;			/* (16) */
40
41#define MAXXLEN		((1 << 24) - 1)
42
43#define XTSLOTSIZE	16
44#define L2XTSLOTSIZE	4
45
46/* xad_t field construction */
47#define XADoffset(xad, offset64)\
48{\
49	(xad)->off1 = ((u64)offset64) >> 32;\
50	(xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\
51}
52#define XADaddress(xad, address64)\
53{\
54	(xad)->addr1 = ((u64)address64) >> 32;\
55	(xad)->addr2 = __cpu_to_le32((address64) & 0xffffffff);\
56}
57#define XADlength(xad, length32)	(xad)->len = __cpu_to_le24(length32)
58
59/* xad_t field extraction */
60#define offsetXAD(xad)\
61	( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))
62#define addressXAD(xad)\
63	( ((s64)((xad)->addr1)) << 32 | __le32_to_cpu((xad)->addr2))
64#define lengthXAD(xad)	__le24_to_cpu((xad)->len)
65
66/* xad list */
67struct xadlist {
68	s16 maxnxad;
69	s16 nxad;
70	xad_t *xad;
71};
72
73/* xad_t flags */
74#define XAD_NEW		0x01	/* new */
75#define XAD_EXTENDED	0x02	/* extended */
76#define XAD_COMPRESSED	0x04	/* compressed with recorded length */
77#define XAD_NOTRECORDED 0x08	/* allocated but not recorded */
78#define XAD_COW		0x10	/* copy-on-write */
79
80
81/* possible values for maxentry */
82#define XTROOTINITSLOT_DIR 6
83#define XTROOTINITSLOT	10
84#define XTROOTMAXSLOT	18
85#define XTPAGEMAXSLOT	256
86#define XTENTRYSTART	2
87
88/*
89 *	xtree page:
90 */
91typedef union {
92	struct xtheader {
93		__le64 next;	/* 8: */
94		__le64 prev;	/* 8: */
95
96		u8 flag;	/* 1: */
97		u8 rsrvd1;	/* 1: */
98		__le16 nextindex;	/* 2: next index = number of entries */
99		__le16 maxentry;	/* 2: max number of entries */
100		__le16 rsrvd2;	/* 2: */
101
102		pxd_t self;	/* 8: self */
103	} header;		/* (32) */
104
105	xad_t xad[XTROOTMAXSLOT];	/* 16 * maxentry: xad array */
106} xtpage_t;
107
108/*
109 *	external declaration
110 */
111extern int xtLookup(struct inode *ip, s64 lstart, s64 llen,
112		    int *pflag, s64 * paddr, int *plen, int flag);
113extern void xtInitRoot(tid_t tid, struct inode *ip);
114extern int xtInsert(tid_t tid, struct inode *ip,
115		    int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
116extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
117		    int flag);
118#ifdef _NOTYET
119extern int xtTailgate(tid_t tid, struct inode *ip,
120		      s64 xoff, int xlen, s64 xaddr, int flag);
121#endif
122extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
123extern int xtDelete(tid_t tid, struct inode *ip, s64 xoff, int xlen,
124		    int flag);
125extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
126extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
127extern int xtRelocate(tid_t tid, struct inode *ip,
128		      xad_t * oxad, s64 nxaddr, int xtype);
129extern int xtAppend(tid_t tid,
130		    struct inode *ip, int xflag, s64 xoff, int maxblocks,
131		    int *xlenp, s64 * xaddrp, int flag);
132#endif				/* !_H_JFS_XTREE */
133