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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 | /* * 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 */ |