1. 根目录:
2. fs
3. xfs
4. xfs_trans_space.h

/*
 * 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_TRANS_SPACE_H__
#define __XFS_TRANS_SPACE_H__

/*
 * Components of space reservations.
 */
#define XFS_MAX_CONTIG_EXTENTS_PER_BLOCK(mp)    \
		(((mp)->m_alloc_mxr[0]) - ((mp)->m_alloc_mnr[0]))
#define	XFS_EXTENTADD_SPACE_RES(mp,w)	(XFS_BM_MAXLEVELS(mp,w) - 1)
#define XFS_NEXTENTADD_SPACE_RES(mp,b,w)\
	(((b + XFS_MAX_CONTIG_EXTENTS_PER_BLOCK(mp) - 1) / \
	  XFS_MAX_CONTIG_EXTENTS_PER_BLOCK(mp)) * \
	  XFS_EXTENTADD_SPACE_RES(mp,w))
#define	XFS_DAENTER_1B(mp,w)	((w) == XFS_DATA_FORK ? (mp)->m_dirblkfsbs : 1)
#define	XFS_DAENTER_DBS(mp,w)	\
	(XFS_DA_NODE_MAXDEPTH + (((w) == XFS_DATA_FORK) ? 2 : 0))
#define	XFS_DAENTER_BLOCKS(mp,w)	\
	(XFS_DAENTER_1B(mp,w) * XFS_DAENTER_DBS(mp,w))
#define	XFS_DAENTER_BMAP1B(mp,w)	\
	XFS_NEXTENTADD_SPACE_RES(mp, XFS_DAENTER_1B(mp, w), w)
#define	XFS_DAENTER_BMAPS(mp,w)		\
	(XFS_DAENTER_DBS(mp,w) * XFS_DAENTER_BMAP1B(mp,w))
#define	XFS_DAENTER_SPACE_RES(mp,w)	\
	(XFS_DAENTER_BLOCKS(mp,w) + XFS_DAENTER_BMAPS(mp,w))
#define	XFS_DAREMOVE_SPACE_RES(mp,w)	XFS_DAENTER_BMAPS(mp,w)
#define	XFS_DIRENTER_MAX_SPLIT(mp,nl)	1
#define	XFS_DIRENTER_SPACE_RES(mp,nl)	\
	(XFS_DAENTER_SPACE_RES(mp, XFS_DATA_FORK) * \
	 XFS_DIRENTER_MAX_SPLIT(mp,nl))
#define	XFS_DIRREMOVE_SPACE_RES(mp)	\
	XFS_DAREMOVE_SPACE_RES(mp, XFS_DATA_FORK)
#define	XFS_IALLOC_SPACE_RES(mp)	\
	(XFS_IALLOC_BLOCKS(mp) + (mp)->m_in_maxlevels - 1)

/*
 * Space reservation values for various transactions.
 */
#define	XFS_ADDAFORK_SPACE_RES(mp)	\
	((mp)->m_dirblkfsbs + XFS_DAENTER_BMAP1B(mp, XFS_DATA_FORK))
#define	XFS_ATTRRM_SPACE_RES(mp)	\
	XFS_DAREMOVE_SPACE_RES(mp, XFS_ATTR_FORK)
/* This macro is not used - see inline code in xfs_attr_set */
#define	XFS_ATTRSET_SPACE_RES(mp, v)	\
	(XFS_DAENTER_SPACE_RES(mp, XFS_ATTR_FORK) + XFS_B_TO_FSB(mp, v))
#define	XFS_CREATE_SPACE_RES(mp,nl)	\
	(XFS_IALLOC_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp,nl))
#define	XFS_DIOSTRAT_SPACE_RES(mp, v)	\
	(XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK) + (v))
#define	XFS_GROWFS_SPACE_RES(mp)	\
	(2 * XFS_AG_MAXLEVELS(mp))
#define	XFS_GROWFSRT_SPACE_RES(mp,b)	\
	((b) + XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK))
#define	XFS_LINK_SPACE_RES(mp,nl)	\
	XFS_DIRENTER_SPACE_RES(mp,nl)
#define	XFS_MKDIR_SPACE_RES(mp,nl)	\
	(XFS_IALLOC_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp,nl))
#define	XFS_QM_DQALLOC_SPACE_RES(mp)	\
	(XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK) + \
	 XFS_DQUOT_CLUSTER_SIZE_FSB)
#define	XFS_QM_QINOCREATE_SPACE_RES(mp)	\
	XFS_IALLOC_SPACE_RES(mp)
#define	XFS_REMOVE_SPACE_RES(mp)	\
	XFS_DIRREMOVE_SPACE_RES(mp)
#define	XFS_RENAME_SPACE_RES(mp,nl)	\
	(XFS_DIRREMOVE_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp,nl))
#define	XFS_SYMLINK_SPACE_RES(mp,nl,b)	\
	(XFS_IALLOC_SPACE_RES(mp) + XFS_DIRENTER_SPACE_RES(mp,nl) + (b))

#endif	/* __XFS_TRANS_SPACE_H__ */