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kernel/linux-imx6_3.14.28/fs/freevxfs/vxfs_olt.h 4.38 KB
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  /*
   * Copyright (c) 2000-2001 Christoph Hellwig.
   * All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions, and the following disclaimer,
   *    without modification.
   * 2. The name of the author may not be used to endorse or promote products
   *    derived from this software without specific prior written permission.
   *
   * Alternatively, this software may be distributed under the terms of the
   * GNU General Public License ("GPL").
   *
   * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
   * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   * SUCH DAMAGE.
   *
   */
  #ifndef _VXFS_OLT_H_
  #define _VXFS_OLT_H_
  
  /*
   * Veritas filesystem driver - Object Location Table data structures.
   *
   * This file contains definitions for the Object Location Table used
   * by the Veritas Filesystem version 2 and newer.
   */
  
  
  /*
   * OLT magic number (vxfs_olt->olt_magic).
   */
  #define VXFS_OLT_MAGIC		0xa504FCF5
  
  /*
   * VxFS OLT entry types.
   */
  enum {
  	VXFS_OLT_FREE	= 1,
  	VXFS_OLT_FSHEAD	= 2,
  	VXFS_OLT_CUT	= 3,
  	VXFS_OLT_ILIST	= 4,
  	VXFS_OLT_DEV	= 5,
  	VXFS_OLT_SB	= 6
  };
  
  /*
   * VxFS OLT header.
   *
   * The Object Location Table header is placed at the beginning of each
   * OLT extent.  It is used to fing certain filesystem-wide metadata, e.g.
   * the initial inode list, the fileset header or the device configuration.
   */
  struct vxfs_olt {
  	u_int32_t	olt_magic;	/* magic number			*/
  	u_int32_t	olt_size;	/* size of this entry		*/
  	u_int32_t	olt_checksum;	/* checksum of extent		*/
  	u_int32_t	__unused1;	/* ???				*/
  	u_int32_t	olt_mtime;	/* time of last mod. (sec)	*/
  	u_int32_t	olt_mutime;	/* time of last mod. (usec)	*/
  	u_int32_t	olt_totfree;	/* free space in OLT extent	*/
  	vx_daddr_t	olt_extents[2];	/* addr of this extent, replica	*/
  	u_int32_t	olt_esize;	/* size of this extent		*/
  	vx_daddr_t	olt_next[2];    /* addr of next extent, replica	*/
  	u_int32_t	olt_nsize;	/* size of next extent		*/
  	u_int32_t	__unused2;	/* align to 8 byte boundary	*/
  };
  
  /*
   * VxFS common OLT entry (on disk).
   */
  struct vxfs_oltcommon {
  	u_int32_t	olt_type;	/* type of this record		*/
  	u_int32_t	olt_size;	/* size of this record		*/
  };
  
  /*
   * VxFS free OLT entry (on disk).
   */
  struct vxfs_oltfree {
  	u_int32_t	olt_type;	/* type of this record		*/
  	u_int32_t	olt_fsize;	/* size of this free record	*/
  };
  
  /*
   * VxFS initial-inode list (on disk).
   */
  struct vxfs_oltilist {
  	u_int32_t	olt_type;	/* type of this record		*/
  	u_int32_t	olt_size;	/* size of this record		*/
  	vx_ino_t	olt_iext[2];	/* initial inode list, replica	*/
  };
  
  /*
   * Current Usage Table 
   */
  struct vxfs_oltcut {
  	u_int32_t	olt_type;	/* type of this record		*/
  	u_int32_t	olt_size;	/* size of this record		*/
  	vx_ino_t	olt_cutino;	/* inode of current usage table	*/
  	u_int32_t	__pad;		/* unused, 8 byte align		*/
  };
  
  /*
   * Inodes containing Superblock, Intent log and OLTs 
   */
  struct vxfs_oltsb {
  	u_int32_t	olt_type;	/* type of this record		*/
  	u_int32_t	olt_size;	/* size of this record		*/
  	vx_ino_t	olt_sbino;	/* inode of superblock file	*/
  	u_int32_t	__unused1;	/* ???				*/
  	vx_ino_t	olt_logino[2];	/* inode of log file,replica	*/
  	vx_ino_t	olt_oltino[2];	/* inode of OLT, replica	*/
  };
  
  /*
   * Inode containing device configuration + it's replica 
   */
  struct vxfs_oltdev {
  	u_int32_t	olt_type;	/* type of this record		*/
  	u_int32_t	olt_size;	/* size of this record		*/
  	vx_ino_t	olt_devino[2];	/* inode of device config files	*/
  };
  
  /*
   * Fileset header 
   */
  struct vxfs_oltfshead {
  	u_int32_t	olt_type;	/* type number			*/
  	u_int32_t	olt_size;	/* size of this record		*/
  	vx_ino_t	olt_fsino[2];   /* inodes of fileset header	*/
  };
  
  #endif /* _VXFS_OLT_H_ */