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 68/* 69 * xtree page: 70 */ 71typedef union { 72 struct xtheader { 73 __le64 next; /* 8: */ 74 __le64 prev; /* 8: */ 75 76 u8 flag; /* 1: */ 77 u8 rsrvd1; /* 1: */ 78 __le16 nextindex; /* 2: next index = number of entries */ 79 __le16 maxentry; /* 2: max number of entries */ 80 __le16 rsrvd2; /* 2: */ 81 82 pxd_t self; /* 8: self */ 83 } header; /* (32) */ 84 85 xad_t xad[XTROOTMAXSLOT]; /* 16 * maxentry: xad array */ 86} xtpage_t; 87 88/* 89 * external declaration 90 */ 91extern int xtLookup(struct inode *ip, s64 lstart, s64 llen, 92 int *pflag, s64 * paddr, int *plen, int flag); 93extern void xtInitRoot(tid_t tid, struct inode *ip); 94extern int xtInsert(tid_t tid, struct inode *ip, 95 int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag); 96extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen, 97 int flag); 98extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad); 99extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type); 100extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size); 101extern int xtAppend(tid_t tid, 102 struct inode *ip, int xflag, s64 xoff, int maxblocks, 103 int *xlenp, s64 * xaddrp, int flag); 104#endif /* !_H_JFS_XTREE */ 105