linux/fs/xfs/xfs_extfree_item.h

/*
 * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 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.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */
#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;

/*
 * 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 {
	unsigned short		efi_type;	/* efi log item type */
	unsigned short		efi_size;	/* size of this item */
	uint			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;

/*
 * 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 {
	unsigned short		efd_type;	/* efd log item type */
	unsigned short		efd_size;	/* size of this item */
	uint			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;


#ifdef __KERNEL__

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

/*
 * Define EFI flags.
 */
#define	XFS_EFI_RECOVERED	0x1
#define	XFS_EFI_COMMITTED	0x2
#define	XFS_EFI_CANCELED	0x4

/*
 * 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;
	uint			efi_flags;	/* misc flags */
	uint			efi_next_extent;
	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);

void			xfs_efi_item_free(xfs_efi_log_item_t *);

#endif	/* __KERNEL__ */

#endif	/* __XFS_EXTFREE_ITEM_H__ */