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 */ 31 typedef 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 u32 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 u32 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 */ 67 struct 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 */ 91 typedef union { 92 struct xtheader { 93 s64 next; /* 8: */ 94 s64 prev; /* 8: */ 95 96 u8 flag; /* 1: */ 97 u8 rsrvd1; /* 1: */ 98 s16 nextindex; /* 2: next index = number of entries */ 99 s16 maxentry; /* 2: max number of entries */ 100 s16 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 */ 111 extern int xtLookup(struct inode *ip, s64 lstart, s64 llen, 112 int *pflag, s64 * paddr, int *plen, int flag); 113 extern int xtLookupList(struct inode *ip, struct lxdlist * lxdlist, 114 struct xadlist * xadlist, int flag); 115 extern void xtInitRoot(tid_t tid, struct inode *ip); 116 extern int xtInsert(tid_t tid, struct inode *ip, 117 int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag); 118 extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen, 119 int flag); 120 #ifdef _NOTYET 121 extern int xtTailgate(tid_t tid, struct inode *ip, 122 s64 xoff, int xlen, s64 xaddr, int flag); 123 #endif 124 extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad); 125 extern int xtDelete(tid_t tid, struct inode *ip, s64 xoff, int xlen, 126 int flag); 127 extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type); 128 extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size); 129 extern int xtRelocate(tid_t tid, struct inode *ip, 130 xad_t * oxad, s64 nxaddr, int xtype); 131 extern int xtAppend(tid_t tid, 132 struct inode *ip, int xflag, s64 xoff, int maxblocks, 133 int *xlenp, s64 * xaddrp, int flag); 134 135 #ifdef _JFS_DEBUG_XTREE 136 extern int xtDisplayTree(struct inode *ip); 137 extern int xtDisplayPage(struct inode *ip, s64 bn, xtpage_t * p); 138 #endif /* _JFS_DEBUG_XTREE */ 139 140 #endif /* !_H_JFS_XTREE */ 141