/
jfs_xtree.h
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/
jfs_xtree.h
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/*
* Copyright (C) International Business Machines Corp., 2000-2002
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#ifndef _H_JFS_XTREE
#define _H_JFS_XTREE
/*
* jfs_xtree.h: extent allocation descriptor B+-tree manager
*/
#include "jfs_btree.h"
/*
* extent allocation descriptor (xad)
*/
typedef struct xad {
unsigned flag:8; /* 1: flag */
unsigned rsvrd:16; /* 2: reserved */
unsigned off1:8; /* 1: offset in unit of fsblksize */
__le32 off2; /* 4: offset in unit of fsblksize */
unsigned len:24; /* 3: length in unit of fsblksize */
unsigned addr1:8; /* 1: address in unit of fsblksize */
__le32 addr2; /* 4: address in unit of fsblksize */
} xad_t; /* (16) */
#define MAXXLEN ((1 << 24) - 1)
#define XTSLOTSIZE 16
#define L2XTSLOTSIZE 4
/* xad_t field construction */
#define XADoffset(xad, offset64)\
{\
(xad)->off1 = ((u64)offset64) >> 32;\
(xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\
}
#define XADaddress(xad, address64)\
{\
(xad)->addr1 = ((u64)address64) >> 32;\
(xad)->addr2 = __cpu_to_le32((address64) & 0xffffffff);\
}
#define XADlength(xad, length32) (xad)->len = __cpu_to_le24(length32)
/* xad_t field extraction */
#define offsetXAD(xad)\
( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))
#define addressXAD(xad)\
( ((s64)((xad)->addr1)) << 32 | __le32_to_cpu((xad)->addr2))
#define lengthXAD(xad) __le24_to_cpu((xad)->len)
/* xad list */
struct xadlist {
s16 maxnxad;
s16 nxad;
xad_t *xad;
};
/* xad_t flags */
#define XAD_NEW 0x01 /* new */
#define XAD_EXTENDED 0x02 /* extended */
#define XAD_COMPRESSED 0x04 /* compressed with recorded length */
#define XAD_NOTRECORDED 0x08 /* allocated but not recorded */
#define XAD_COW 0x10 /* copy-on-write */
/* possible values for maxentry */
#define XTROOTINITSLOT_DIR 6
#define XTROOTINITSLOT 10
#define XTROOTMAXSLOT 18
#define XTPAGEMAXSLOT 256
#define XTENTRYSTART 2
/*
* xtree page:
*/
typedef union {
struct xtheader {
__le64 next; /* 8: */
__le64 prev; /* 8: */
u8 flag; /* 1: */
u8 rsrvd1; /* 1: */
__le16 nextindex; /* 2: next index = number of entries */
__le16 maxentry; /* 2: max number of entries */
__le16 rsrvd2; /* 2: */
pxd_t self; /* 8: self */
} header; /* (32) */
xad_t xad[XTROOTMAXSLOT]; /* 16 * maxentry: xad array */
} xtpage_t;
/*
* external declaration
*/
extern int xtLookup(struct inode *ip, s64 lstart, s64 llen,
int *pflag, s64 * paddr, int *plen, int flag);
extern void xtInitRoot(tid_t tid, struct inode *ip);
extern int xtInsert(tid_t tid, struct inode *ip,
int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag);
extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen,
int flag);
#ifdef _NOTYET
extern int xtTailgate(tid_t tid, struct inode *ip,
s64 xoff, int xlen, s64 xaddr, int flag);
#endif
extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad);
extern int xtDelete(tid_t tid, struct inode *ip, s64 xoff, int xlen,
int flag);
extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type);
extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size);
extern int xtRelocate(tid_t tid, struct inode *ip,
xad_t * oxad, s64 nxaddr, int xtype);
extern int xtAppend(tid_t tid,
struct inode *ip, int xflag, s64 xoff, int maxblocks,
int *xlenp, s64 * xaddrp, int flag);
#endif /* !_H_JFS_XTREE */