jfs_types.h

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/*
 *   Copyright (C) International Business Machines Corp., 2000-2004
 *
 *   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_TYPES
#define _H_JFS_TYPES

/*
 *  jfs_types.h:
 *
 * basic type/utility definitions
 *
 * note: this header file must be the 1st include file
 * of JFS include list in all JFS .c file.
 */

#include <linux/types.h>
#include <linux/nls.h>

#include "endian24.h"

/*
 * transaction and lock id's
 *
 * Don't change these without carefully considering the impact on the
 * size and alignment of all of the linelock variants
 */
typedef u16 tid_t;
typedef u16 lid_t;

/*
 * Almost identical to Linux's timespec, but not quite
 */
struct timestruc_t {
    __le32 tv_sec;
    __le32 tv_nsec;
};

/*
 *  handy
 */

#define LEFTMOSTONE 0x80000000
#define HIGHORDER   0x80000000u /* high order bit on    */
#define ONES        0xffffffffu /* all bit on       */

/*
 *  physical xd (pxd)
 */
typedef struct {
    unsigned len:24;
    unsigned addr1:8;
    __le32 addr2;
} pxd_t;

/* xd_t field construction */

#define PXDlength(pxd, length32)    ((pxd)->len = __cpu_to_le24(length32))
#define PXDaddress(pxd, address64)\
{\
    (pxd)->addr1 = ((s64)address64) >> 32;\
    (pxd)->addr2 = __cpu_to_le32((address64) & 0xffffffff);\
}

/* xd_t field extraction */
#define lengthPXD(pxd)  __le24_to_cpu((pxd)->len)
#define addressPXD(pxd)\
    ( ((s64)((pxd)->addr1)) << 32 | __le32_to_cpu((pxd)->addr2))

#define MAXTREEHEIGHT 8
/* pxd list */
struct pxdlist {
    s16 maxnpxd;
    s16 npxd;
    pxd_t pxd[MAXTREEHEIGHT];
};


/*
 *  data extent descriptor (dxd)
 */
typedef struct {
    unsigned flag:8;    /* 1: flags */
    unsigned rsrvd:24;
    __le32 size;        /* 4: size in byte */
    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 */
} dxd_t;            /* - 16 - */

/* dxd_t flags */
#define DXD_INDEX   0x80    /* B+-tree index */
#define DXD_INLINE  0x40    /* in-line data extent */
#define DXD_EXTENT  0x20    /* out-of-line single extent */
#define DXD_FILE    0x10    /* out-of-line file (inode) */
#define DXD_CORRUPT 0x08    /* Inconsistency detected */

/* dxd_t field construction
 *  Conveniently, the PXD macros work for DXD
 */
#define DXDlength   PXDlength
#define DXDaddress  PXDaddress
#define lengthDXD   lengthPXD
#define addressDXD  addressPXD
#define DXDsize(dxd, size32) ((dxd)->size = cpu_to_le32(size32))
#define sizeDXD(dxd)    le32_to_cpu((dxd)->size)

/*
 *  directory entry argument
 */
struct component_name {
    int namlen;
    wchar_t *name;
};


/*
 *  DASD limit information - stored in directory inode
 */
struct dasd {
    u8 thresh;      /* Alert Threshold (in percent)     */
    u8 delta;       /* Alert Threshold delta (in percent)   */
    u8 rsrvd1;
    u8 limit_hi;        /* DASD limit (in logical blocks)   */
    __le32 limit_lo;    /* DASD limit (in logical blocks)   */
    u8 rsrvd2[3];
    u8 used_hi;     /* DASD usage (in logical blocks)   */
    __le32 used_lo;     /* DASD usage (in logical blocks)   */
};

#define DASDLIMIT(dasdp) \
    (((u64)((dasdp)->limit_hi) << 32) + __le32_to_cpu((dasdp)->limit_lo))
#define setDASDLIMIT(dasdp, limit)\
{\
    (dasdp)->limit_hi = ((u64)limit) >> 32;\
    (dasdp)->limit_lo = __cpu_to_le32(limit);\
}
#define DASDUSED(dasdp) \
    (((u64)((dasdp)->used_hi) << 32) + __le32_to_cpu((dasdp)->used_lo))
#define setDASDUSED(dasdp, used)\
{\
    (dasdp)->used_hi = ((u64)used) >> 32;\
    (dasdp)->used_lo = __cpu_to_le32(used);\
}

#endif              /* !_H_JFS_TYPES */