/*

   * Copyright (c) 2000,2005 Silicon Graphics, Inc.
   * All Rights Reserved.

   *

   * 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.
   *

   * This program is distributed in the hope that it would 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 the Free Software Foundation,
   * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

   */
  #ifndef	__XFS_EXTFREE_ITEM_H__
  #define	__XFS_EXTFREE_ITEM_H__
  
  struct xfs_mount;
  struct kmem_zone;
  
  typedef struct xfs_extent {
  	xfs_dfsbno_t	ext_start;
  	xfs_extlen_t	ext_len;
  } xfs_extent_t;
  
  /*

   * Since an xfs_extent_t has types (start:64, len: 32)
   * there are different alignments on 32 bit and 64 bit kernels.
   * So we provide the different variants for use by a
   * conversion routine.
   */
  
  typedef struct xfs_extent_32 {

  	__uint64_t	ext_start;
  	__uint32_t	ext_len;

  } __attribute__((packed)) xfs_extent_32_t;
  
  typedef struct xfs_extent_64 {

  	__uint64_t	ext_start;
  	__uint32_t	ext_len;

  	__uint32_t	ext_pad;
  } xfs_extent_64_t;
  
  /*

   * This is the structure used to lay out an efi log item in the
   * log.  The efi_extents field is a variable size array whose
   * size is given by efi_nextents.
   */
  typedef struct xfs_efi_log_format {

  	__uint16_t		efi_type;	/* efi log item type */
  	__uint16_t		efi_size;	/* size of this item */
  	__uint32_t		efi_nextents;	/* # extents to free */

  	__uint64_t		efi_id;		/* efi identifier */
  	xfs_extent_t		efi_extents[1];	/* array of extents to free */
  } xfs_efi_log_format_t;

  typedef struct xfs_efi_log_format_32 {

  	__uint16_t		efi_type;	/* efi log item type */
  	__uint16_t		efi_size;	/* size of this item */
  	__uint32_t		efi_nextents;	/* # extents to free */

  	__uint64_t		efi_id;		/* efi identifier */
  	xfs_extent_32_t		efi_extents[1];	/* array of extents to free */
  } __attribute__((packed)) xfs_efi_log_format_32_t;
  
  typedef struct xfs_efi_log_format_64 {

  	__uint16_t		efi_type;	/* efi log item type */
  	__uint16_t		efi_size;	/* size of this item */
  	__uint32_t		efi_nextents;	/* # extents to free */

  	__uint64_t		efi_id;		/* efi identifier */
  	xfs_extent_64_t		efi_extents[1];	/* array of extents to free */
  } xfs_efi_log_format_64_t;

  /*
   * This is the structure used to lay out an efd log item in the
   * log.  The efd_extents array is a variable size array whose
   * size is given by efd_nextents;
   */
  typedef struct xfs_efd_log_format {

  	__uint16_t		efd_type;	/* efd log item type */
  	__uint16_t		efd_size;	/* size of this item */
  	__uint32_t		efd_nextents;	/* # of extents freed */

  	__uint64_t		efd_efi_id;	/* id of corresponding efi */
  	xfs_extent_t		efd_extents[1];	/* array of extents freed */
  } xfs_efd_log_format_t;

  typedef struct xfs_efd_log_format_32 {

  	__uint16_t		efd_type;	/* efd log item type */
  	__uint16_t		efd_size;	/* size of this item */
  	__uint32_t		efd_nextents;	/* # of extents freed */

  	__uint64_t		efd_efi_id;	/* id of corresponding efi */
  	xfs_extent_32_t		efd_extents[1];	/* array of extents freed */
  } __attribute__((packed)) xfs_efd_log_format_32_t;
  
  typedef struct xfs_efd_log_format_64 {

  	__uint16_t		efd_type;	/* efd log item type */
  	__uint16_t		efd_size;	/* size of this item */
  	__uint32_t		efd_nextents;	/* # of extents freed */

  	__uint64_t		efd_efi_id;	/* id of corresponding efi */
  	xfs_extent_64_t		efd_extents[1];	/* array of extents freed */
  } xfs_efd_log_format_64_t;

  
  #ifdef __KERNEL__
  
  /*
   * Max number of extents in fast allocation path.
   */
  #define	XFS_EFI_MAX_FAST_EXTENTS	16
  
  /*

   * Define EFI flag bits. Manipulated by set/clear/test_bit operators.

   */

  #define	XFS_EFI_RECOVERED	1
  #define	XFS_EFI_COMMITTED	2

  
  /*
   * This is the "extent free intention" log item.  It is used
   * to log the fact that some extents need to be free.  It is
   * used in conjunction with the "extent free done" log item
   * described below.
   */
  typedef struct xfs_efi_log_item {
  	xfs_log_item_t		efi_item;

  	atomic_t		efi_next_extent;
  	unsigned long		efi_flags;	/* misc flags */

  	xfs_efi_log_format_t	efi_format;
  } xfs_efi_log_item_t;
  
  /*
   * This is the "extent free done" log item.  It is used to log
   * the fact that some extents earlier mentioned in an efi item
   * have been freed.
   */
  typedef struct xfs_efd_log_item {
  	xfs_log_item_t		efd_item;
  	xfs_efi_log_item_t	*efd_efip;
  	uint			efd_next_extent;
  	xfs_efd_log_format_t	efd_format;
  } xfs_efd_log_item_t;
  
  /*
   * Max number of extents in fast allocation path.
   */
  #define	XFS_EFD_MAX_FAST_EXTENTS	16
  
  extern struct kmem_zone	*xfs_efi_zone;
  extern struct kmem_zone	*xfs_efd_zone;
  
  xfs_efi_log_item_t	*xfs_efi_init(struct xfs_mount *, uint);
  xfs_efd_log_item_t	*xfs_efd_init(struct xfs_mount *, xfs_efi_log_item_t *,
  				      uint);

  int			xfs_efi_copy_format(xfs_log_iovec_t *buf,
  					    xfs_efi_log_format_t *dst_efi_fmt);

  void			xfs_efi_item_free(xfs_efi_log_item_t *);

  #endif	/* __KERNEL__ */
  
  #endif	/* __XFS_EXTFREE_ITEM_H__ */