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112 lines
3.1 KiB
112 lines
3.1 KiB
/* SPDX-License-Identifier: GPL-2.0-or-later */ |
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/* |
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* Copyright (C) International Business Machines Corp., 2000-2002 |
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*/ |
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#ifndef _H_JFS_XTREE |
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#define _H_JFS_XTREE |
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/* |
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* jfs_xtree.h: extent allocation descriptor B+-tree manager |
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*/ |
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#include "jfs_btree.h" |
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/* |
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* extent allocation descriptor (xad) |
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*/ |
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typedef struct xad { |
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__u8 flag; /* 1: flag */ |
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__u8 rsvrd[2]; /* 2: reserved */ |
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__u8 off1; /* 1: offset in unit of fsblksize */ |
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__le32 off2; /* 4: offset in unit of fsblksize */ |
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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 |
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#define L2XTSLOTSIZE 4 |
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/* xad_t field construction */ |
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#define XADoffset(xad, offset64)\ |
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{\ |
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(xad)->off1 = ((u64)offset64) >> 32;\ |
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(xad)->off2 = __cpu_to_le32((offset64) & 0xffffffff);\ |
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} |
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#define XADaddress(xad, address64) PXDaddress(&(xad)->loc, address64) |
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#define XADlength(xad, length32) PXDlength(&(xad)->loc, length32) |
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/* xad_t field extraction */ |
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#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) |
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#define lengthXAD(xad) lengthPXD(&(xad)->loc) |
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/* xad list */ |
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struct xadlist { |
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s16 maxnxad; |
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s16 nxad; |
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xad_t *xad; |
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}; |
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/* xad_t flags */ |
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#define XAD_NEW 0x01 /* new */ |
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#define XAD_EXTENDED 0x02 /* extended */ |
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#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 |
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#define XTROOTINITSLOT 10 |
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#define XTROOTMAXSLOT 18 |
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#define XTPAGEMAXSLOT 256 |
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#define XTENTRYSTART 2 |
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/* |
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* xtree page: |
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*/ |
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typedef union { |
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struct xtheader { |
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__le64 next; /* 8: */ |
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__le64 prev; /* 8: */ |
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u8 flag; /* 1: */ |
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u8 rsrvd1; /* 1: */ |
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__le16 nextindex; /* 2: next index = number of entries */ |
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__le16 maxentry; /* 2: max number of entries */ |
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__le16 rsrvd2; /* 2: */ |
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pxd_t self; /* 8: self */ |
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} header; /* (32) */ |
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xad_t xad[XTROOTMAXSLOT]; /* 16 * maxentry: xad array */ |
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} xtpage_t; |
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/* |
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* external declaration |
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*/ |
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extern int xtLookup(struct inode *ip, s64 lstart, s64 llen, |
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int *pflag, s64 * paddr, int *plen, int flag); |
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extern void xtInitRoot(tid_t tid, struct inode *ip); |
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extern int xtInsert(tid_t tid, struct inode *ip, |
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int xflag, s64 xoff, int xlen, s64 * xaddrp, int flag); |
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extern int xtExtend(tid_t tid, struct inode *ip, s64 xoff, int xlen, |
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int flag); |
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#ifdef _NOTYET |
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extern int xtTailgate(tid_t tid, struct inode *ip, |
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s64 xoff, int xlen, s64 xaddr, int flag); |
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#endif |
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extern int xtUpdate(tid_t tid, struct inode *ip, struct xad *nxad); |
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extern int xtDelete(tid_t tid, struct inode *ip, s64 xoff, int xlen, |
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int flag); |
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extern s64 xtTruncate(tid_t tid, struct inode *ip, s64 newsize, int type); |
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extern s64 xtTruncate_pmap(tid_t tid, struct inode *ip, s64 committed_size); |
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extern int xtRelocate(tid_t tid, struct inode *ip, |
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xad_t * oxad, s64 nxaddr, int xtype); |
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extern int xtAppend(tid_t tid, |
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struct inode *ip, int xflag, s64 xoff, int maxblocks, |
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int *xlenp, s64 * xaddrp, int flag); |
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#endif /* !_H_JFS_XTREE */
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