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e471e5942c
Since the JFS code was first added to Linux, there has been code hidden in ifdefs for some potential future features such as defragmentation and supporting block sizes other than 4KB. There has been no ongoing development on JFS for many years, so it's past time to remove this dead code from the source. Signed-off-by: Dave Kleikamp <dave.kleikamp@oracle.com>
109 lines
3.0 KiB
C
109 lines
3.0 KiB
C
/* 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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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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