diff options
Diffstat (limited to 'fs/jfs/jfs_xtree.h')
| -rw-r--r-- | fs/jfs/jfs_xtree.h | 140 |
1 files changed, 140 insertions, 0 deletions
diff --git a/fs/jfs/jfs_xtree.h b/fs/jfs/jfs_xtree.h new file mode 100644 index 000000000000..a69784254fe7 --- /dev/null +++ b/fs/jfs/jfs_xtree.h @@ -0,0 +1,140 @@ +/* + * 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 int xtLookupList(struct inode *ip, struct lxdlist * lxdlist, + struct xadlist * xadlist, 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); + +#ifdef _JFS_DEBUG_XTREE +extern int xtDisplayTree(struct inode *ip); +extern int xtDisplayPage(struct inode *ip, s64 bn, xtpage_t * p); +#endif /* _JFS_DEBUG_XTREE */ + +#endif /* !_H_JFS_XTREE */ |