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fs/jfs/jfs_xtree.h
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/* |
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* Copyright (C) International Business Machines Corp., 2000-2002 |
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* * 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 |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* 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 |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #ifndef _H_JFS_XTREE #define _H_JFS_XTREE /* |
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* jfs_xtree.h: extent allocation descriptor B+-tree manager |
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*/ #include "jfs_btree.h" /* |
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* extent allocation descriptor (xad) |
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*/ typedef struct xad { |
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__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 */ |
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} xad_t; /* (16) */ |
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#define MAXXLEN ((1 << 24) - 1) |
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#define XTSLOTSIZE 16 #define L2XTSLOTSIZE 4 |
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/* xad_t field construction */ #define XADoffset(xad, offset64)\ {\ |
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(xad)->off1 = ((u64)offset64) >> 32;\ (xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\ |
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} |
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#define XADaddress(xad, address64) PXDaddress(&(xad)->loc, address64) #define XADlength(xad, length32) PXDlength(&(xad)->loc, length32) |
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/* xad_t field extraction */ #define offsetXAD(xad)\ |
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( ((s64)((xad)->off1)) << 32 | __le32_to_cpu((xad)->off2)) |
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#define addressXAD(xad) addressPXD(&(xad)->loc) #define lengthXAD(xad) lengthPXD(&(xad)->loc) |
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/* xad list */ struct xadlist { s16 maxnxad; s16 nxad; xad_t *xad; }; /* xad_t flags */ |
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#define XAD_NEW 0x01 /* new */ #define XAD_EXTENDED 0x02 /* extended */ #define XAD_COMPRESSED 0x04 /* compressed with recorded length */ |
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#define XAD_NOTRECORDED 0x08 /* allocated but not recorded */ |
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#define XAD_COW 0x10 /* copy-on-write */ |
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/* possible values for maxentry */ |
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#define XTROOTINITSLOT_DIR 6 #define XTROOTINITSLOT 10 #define XTROOTMAXSLOT 18 #define XTPAGEMAXSLOT 256 #define XTENTRYSTART 2 |
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/* |
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* xtree page: |
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*/ 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; /* |
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* external declaration |
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*/ extern int xtLookup(struct inode *ip, s64 lstart, s64 llen, int *pflag, s64 * paddr, int *plen, int flag); |
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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); |
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#endif /* !_H_JFS_XTREE */ |