include/xfs_multidisk.h

/*
 * Copyright (c) 2000-2001,2004-2005 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_MULTIDISK_H__
#define	__XFS_MULTIDISK_H__

#define XFS_DFL_SB_VERSION_BITS \
                (XFS_SB_VERSION_NLINKBIT | \
                 XFS_SB_VERSION_EXTFLGBIT | \
                 XFS_SB_VERSION_DIRV2BIT)

#define	XFS_DFL_BLOCKSIZE_LOG	12		/* 4096 byte blocks */
#define	XFS_DINODE_DFL_LOG	8		/* 256 byte inodes */
#define	XFS_DINODE_DFL_CRC_LOG	9		/* 512 byte inodes for CRCs */
#define	XFS_MIN_DATA_BLOCKS	100
#define	XFS_MIN_INODE_PERBLOCK	2		/* min inodes per block */
#define	XFS_DFL_IMAXIMUM_PCT	25		/* max % of space for inodes */
#define	XFS_IFLAG_ALIGN		true		/* -i align defaults on */
#define	XFS_MIN_REC_DIRSIZE	12		/* 4096 byte dirblocks (V2) */
#define	XFS_DFL_DIR_VERSION	2		/* default directory version */
#define	XFS_DFL_LOG_SIZE	1000		/* default log size, blocks */
#define	XFS_DFL_LOG_FACTOR	5		/* default log size, factor */
						/* with max trans reservation */
#define XFS_MAX_INODE_SIG_BITS	32		/* most significant bits in an
						 * inode number that we'll
						 * accept w/o warnings
						 */

#define XFS_AG_BYTES(bblog)	((long long)BBSIZE << (bblog))
#define	XFS_AG_MIN_BYTES	((XFS_AG_BYTES(15)))	/* 16 MB */
#define	XFS_AG_MAX_BYTES	((XFS_AG_BYTES(31)))	/* 1 TB */
#define XFS_AG_MIN_BLOCKS(blog)	(XFS_AG_MIN_BYTES >> (blog))
#define XFS_AG_MAX_BLOCKS(blog)	((XFS_AG_MAX_BYTES - 1) >> (blog))

#define XFS_MAX_AGNUMBER	((xfs_agnumber_t)(NULLAGNUMBER - 1))

/*
 * These values define what we consider a "multi-disk" filesystem. That is, a
 * filesystem that is likely to be made up of multiple devices, and hence have
 * some level of parallelism available to it at the IO level.
 */
#define XFS_MULTIDISK_AGLOG		5	/* 32 AGs */
#define XFS_NOMULTIDISK_AGLOG		2	/* 4 AGs */
#define XFS_MULTIDISK_AGCOUNT		(1 << XFS_MULTIDISK_AGLOG)

extern long long cvtnum(unsigned int blksize, unsigned int sectsize,
			const char *str);

/* proto.c */
extern char *setup_proto (char *fname);
extern void parse_proto (xfs_mount_t *mp, struct fsxattr *fsx, char **pp);
extern void res_failed (int err);

/* maxtrres.c */
extern int max_trans_res (int crcs_enabled, int dirversion,
		int sectorlog, int blocklog, int inodelog, int dirblocklog,
		int logversion, int log_sunit, int finobt);

#endif	/* __XFS_MULTIDISK_H__ */