/*
|
* 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 {
|
__u8 flag; /* 1: flag */
|
__u8 rsvrd[2]; /* 2: reserved */
|
__u8 off1; /* 1: offset in unit of fsblksize */
|
__le32 off2; /* 4: offset in unit of fsblksize */
|
pxd_t loc; /* 8: length and 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) PXDaddress(&(xad)->loc, address64)
|
#define XADlength(xad, length32) PXDlength(&(xad)->loc, length32)
|
|
/* xad_t field extraction */
|
#define offsetXAD(xad)\
|
( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2))
|
#define addressXAD(xad) addressPXD(&(xad)->loc)
|
#define lengthXAD(xad) lengthPXD(&(xad)->loc)
|
|
/* 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 */
|
