FreeBSD/Linux Kernel Cross Reference
sys/fs/jfs/jfs_xtree.h

     /*
      *   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 */
            u32 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 */
            u32 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 {
                    s64 next;       /* 8: */
                    s64 prev;       /* 8: */
    
                    u8 flag;        /* 1: */
                    u8 rsrvd1;      /* 1: */
                    s16 nextindex;  /* 2: next index = number of entries */
                    s16 maxentry;   /* 2: max number of entries */
                   s16 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);
   extern int xtTailgate(tid_t tid, struct inode *ip,
                         s64 xoff, int xlen, s64 xaddr, int flag);
   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 */

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