Blame view
fs/jfs/jfs_xtree.h
3.99 KB
1da177e4c Linux-2.6.12-rc2 |
1 |
/* |
63f83c9fc JFS: White space ... |
2 |
* Copyright (C) International Business Machines Corp., 2000-2002 |
1da177e4c Linux-2.6.12-rc2 |
3 4 5 |
* * 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 |
63f83c9fc JFS: White space ... |
6 |
* the Free Software Foundation; either version 2 of the License, or |
1da177e4c Linux-2.6.12-rc2 |
7 |
* (at your option) any later version. |
63f83c9fc JFS: White space ... |
8 |
* |
1da177e4c Linux-2.6.12-rc2 |
9 10 11 12 13 14 |
* 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 |
63f83c9fc JFS: White space ... |
15 |
* along with this program; if not, write to the Free Software |
1da177e4c Linux-2.6.12-rc2 |
16 17 18 19 20 21 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _H_JFS_XTREE #define _H_JFS_XTREE /* |
f720e3ba5 JFS: Whitespace c... |
22 |
* jfs_xtree.h: extent allocation descriptor B+-tree manager |
1da177e4c Linux-2.6.12-rc2 |
23 24 25 26 27 28 |
*/ #include "jfs_btree.h" /* |
f720e3ba5 JFS: Whitespace c... |
29 |
* extent allocation descriptor (xad) |
1da177e4c Linux-2.6.12-rc2 |
30 31 32 33 34 35 36 37 38 39 |
*/ 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) */ |
f720e3ba5 JFS: Whitespace c... |
40 |
#define MAXXLEN ((1 << 24) - 1) |
1da177e4c Linux-2.6.12-rc2 |
41 |
|
f720e3ba5 JFS: Whitespace c... |
42 43 |
#define XTSLOTSIZE 16 #define L2XTSLOTSIZE 4 |
1da177e4c Linux-2.6.12-rc2 |
44 45 46 47 |
/* xad_t field construction */ #define XADoffset(xad, offset64)\ {\ |
f720e3ba5 JFS: Whitespace c... |
48 49 |
(xad)->off1 = ((u64)offset64) >> 32;\ (xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\ |
1da177e4c Linux-2.6.12-rc2 |
50 51 52 |
} #define XADaddress(xad, address64)\ {\ |
f720e3ba5 JFS: Whitespace c... |
53 54 |
(xad)->addr1 = ((u64)address64) >> 32;\ (xad)->addr2 = __cpu_to_le32((address64) & 0xffffffff);\ |
1da177e4c Linux-2.6.12-rc2 |
55 |
} |
f720e3ba5 JFS: Whitespace c... |
56 |
#define XADlength(xad, length32) (xad)->len = __cpu_to_le24(length32) |
1da177e4c Linux-2.6.12-rc2 |
57 58 59 |
/* xad_t field extraction */ #define offsetXAD(xad)\ |
f720e3ba5 JFS: Whitespace c... |
60 |
( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2)) |
1da177e4c Linux-2.6.12-rc2 |
61 |
#define addressXAD(xad)\ |
f720e3ba5 JFS: Whitespace c... |
62 63 |
( ((s64)((xad)->addr1)) << 32 | __le32_to_cpu((xad)->addr2)) #define lengthXAD(xad) __le24_to_cpu((xad)->len) |
1da177e4c Linux-2.6.12-rc2 |
64 65 66 67 68 69 70 71 72 |
/* xad list */ struct xadlist { s16 maxnxad; s16 nxad; xad_t *xad; }; /* xad_t flags */ |
f720e3ba5 JFS: Whitespace c... |
73 74 75 |
#define XAD_NEW 0x01 /* new */ #define XAD_EXTENDED 0x02 /* extended */ #define XAD_COMPRESSED 0x04 /* compressed with recorded length */ |
1da177e4c Linux-2.6.12-rc2 |
76 |
#define XAD_NOTRECORDED 0x08 /* allocated but not recorded */ |
f720e3ba5 JFS: Whitespace c... |
77 |
#define XAD_COW 0x10 /* copy-on-write */ |
1da177e4c Linux-2.6.12-rc2 |
78 79 80 |
/* possible values for maxentry */ |
f720e3ba5 JFS: Whitespace c... |
81 82 83 84 85 |
#define XTROOTINITSLOT_DIR 6 #define XTROOTINITSLOT 10 #define XTROOTMAXSLOT 18 #define XTPAGEMAXSLOT 256 #define XTENTRYSTART 2 |
1da177e4c Linux-2.6.12-rc2 |
86 87 |
/* |
f720e3ba5 JFS: Whitespace c... |
88 |
* xtree page: |
1da177e4c Linux-2.6.12-rc2 |
89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 |
*/ 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; /* |
f720e3ba5 JFS: Whitespace c... |
108 |
* external declaration |
1da177e4c Linux-2.6.12-rc2 |
109 110 111 |
*/ extern int xtLookup(struct inode *ip, s64 lstart, s64 llen, int *pflag, s64 * paddr, int *plen, int flag); |
1da177e4c Linux-2.6.12-rc2 |
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 |
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); |
1da177e4c Linux-2.6.12-rc2 |
131 |
#endif /* !_H_JFS_XTREE */ |