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Allow tools to use direct IO on Linux when reading from the device, if teh device supports it, and if the tools is OK with that (most are).  Mainly for xfs_repair speedups, now that libxfs caches metadata buffers internally.
Merge of master-melb:xfs-cmds:26728a by kenmcd.

/*
 * Copyright (c) 2000-2002,2005 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_REPAIR_GLOBAL_H
#define _XFS_REPAIR_GLOBAL_H

#ifndef EXTERN
#define EXTERN extern
#endif

/* useful macros */

#define rounddown(x, y) (((x)/(y))*(y))

/* error flags */

#define XR_OK			0	/* good */
#define XR_BAD_MAGIC		1	/* bad magic number */
#define XR_BAD_BLOCKSIZE	2	/* bad block size */
#define XR_BAD_BLOCKLOG		3	/* bad sb_blocklog field */
#define XR_BAD_VERSION		4	/* bad version number */
#define XR_BAD_INPROGRESS	5	/* in progress set */
#define XR_BAD_FS_SIZE_DATA	6	/* ag sizes, number, fs size mismatch */
#define XR_BAD_INO_SIZE_DATA	7	/* bad inode size or perblock fields */
#define XR_BAD_SECT_SIZE_DATA	8	/* bad sector size info */
#define XR_AGF_GEO_MISMATCH	9	/* agf info conflicts with sb */
#define XR_AGI_GEO_MISMATCH	10	/* agf info conflicts with sb */
#define XR_SB_GEO_MISMATCH	11	/* sb geo conflicts with fs sb geo */
#define XR_EOF			12	/* seeked beyond EOF */
#define XR_BAD_RT_GEO_DATA	13	/* realtime geometry inconsistent */
#define XR_BAD_INO_MAX_PCT	14	/* max % of inodes > 100% */
#define XR_BAD_INO_ALIGN	15	/* bad inode alignment value */
#define XR_INSUFF_SEC_SB	16	/* not enough matching secondary sbs */
#define XR_BAD_SB_UNIT		17	/* bad stripe unit */
#define XR_BAD_SB_WIDTH		18	/* bad stripe width */
#define XR_BAD_SVN		19	/* bad shared version number */
#define XR_BAD_ERR_CODE		20	/* Bad error code */

/* XFS filesystem (il)legal values */

#define XR_LOG2BSIZE_MIN	9	/* min/max fs blocksize (log2) */
#define XR_LOG2BSIZE_MAX	16	/* 2^XR_* == blocksize */

#define	NUM_SBS			8	/* max # of sbs to verify */
#define NUM_AGH_SECTS		4	/* # of components in an ag header */

/*
 * secondary sb mask -- if the secondary sb feature bits has a
 * the partial sb mask bit set, then you depend on the fields
 * in it up to and including sb_inoalignmt but the unused part of the
 * sector may have trash in it.  If the sb has any bits set that are in
 * the good mask, then the entire sb and sector are good (was bzero'ed
 * by mkfs).  The third mask is for filesystems made by pre-6.5 campus
 * alpha mkfs's.  Those are rare so we'll check for those under
 * a special option.
 */
#define XR_PART_SECSB_VNMASK	0x0F80	/* >= XFS_SB_VERSION_ALIGNBIT */
#define XR_GOOD_SECSB_VNMASK	0x0F00	/* >= XFS_SB_VERSION_DALIGNBIT */
#define XR_ALPHA_SECSB_VNMASK	0x0180	/* DALIGN|ALIGN bits */

/* global variables for xfs_repair */

/* arguments and argument flag variables */

EXTERN char	*fs_name;		/* name of filesystem */
EXTERN int	verbose;		/* verbose flag, mostly for debugging */


/* for reading stuff in manually (bypassing libsim) */

EXTERN char	*iobuf;			/* large buffer */
EXTERN int	iobuf_size;
EXTERN char	*smallbuf;		/* small (1-4 page) buffer */
EXTERN int	smallbuf_size;
EXTERN char	*sb_bufs[NUM_SBS];	/* superblock buffers */
EXTERN int	sbbuf_size;

/* direct I/O info */

EXTERN int	minio_align;		/* min I/O size and alignment */
EXTERN int	mem_align;		/* memory alignment */
EXTERN int	max_iosize;		/* max I/O size */

/* file descriptors */

EXTERN int	fs_fd;			/* filesystem fd */

/* command-line flags */

EXTERN int	verbose;
EXTERN int	no_modify;
EXTERN int	dangerously;		/* live dangerously ... fix ro mount */
EXTERN int	isa_file;
EXTERN int	zap_log;
EXTERN int	dumpcore;		/* abort, not exit on fatal errs */
EXTERN int	delete_attr_ok;		/* can clear attrs w/o clearing files */
EXTERN int	force_geo;		/* can set geo on low confidence info */
EXTERN int	assume_xfs;		/* assume we have an xfs fs */
EXTERN int	pre_65_beta;		/* fs was mkfs'ed by a version earlier * than 6.5-beta */
EXTERN char	*log_name;		/* Name of log device */
EXTERN int	log_spec;		/* Log dev specified as option */
EXTERN char	*rt_name;		/* Name of realtime device */
EXTERN int	rt_spec;		/* Realtime dev specified as option */

/* misc status variables */

EXTERN int		primary_sb_modified;
EXTERN int		bad_ino_btree;
EXTERN int		clear_sunit;
EXTERN int		fs_is_dirty;

/* for hunting down the root inode */

EXTERN int		need_root_inode;
EXTERN int		need_root_dotdot;

EXTERN int		need_rbmino;
EXTERN int		need_rsumino;

EXTERN int		lost_quotas;
EXTERN int		have_uquotino;
EXTERN int		have_gquotino;
EXTERN int		lost_uquotino;
EXTERN int		lost_gquotino;
EXTERN int		lost_pquotino;

EXTERN xfs_agino_t	first_prealloc_ino;
EXTERN xfs_agino_t	last_prealloc_ino;
EXTERN xfs_agblock_t	bnobt_root;
EXTERN xfs_agblock_t	bcntbt_root;
EXTERN xfs_agblock_t	inobt_root;

/* configuration vars -- fs geometry dependent */

EXTERN int		inodes_per_block;
EXTERN int		inodes_per_cluster;	/* inodes per inode buffer */
EXTERN unsigned int	glob_agcount;
EXTERN int		chunks_pblock;	/* # of 64-ino chunks per allocation */
EXTERN int		max_symlink_blocks;
EXTERN __int64_t	fs_max_file_offset;

/* block allocation bitmaps */

EXTERN __uint64_t	**ba_bmap;	/* see incore.h */
EXTERN __uint64_t	*rt_ba_bmap;	/* see incore.h */

/* realtime info */

EXTERN xfs_rtword_t	*btmcompute;
EXTERN xfs_suminfo_t	*sumcompute;

/* inode tree records have full or partial backptr fields ? */

EXTERN int		full_backptrs;	/*
					 * if 1, use backptrs_t component
					 * of ino_un union, if 0, use
					 * parent_list_t component.  see
					 * incore.h for more details
					 */

#define ORPHANAGE	"lost+found"

/* superblock counters */

EXTERN __uint64_t	sb_icount;	/* allocated (made) inodes */
EXTERN __uint64_t	sb_ifree;	/* free inodes */
EXTERN __uint64_t	sb_fdblocks;	/* free data blocks */
EXTERN __uint64_t	sb_frextents;	/* free realtime extents */

EXTERN xfs_ino_t	orphanage_ino;
EXTERN xfs_ino_t	old_orphanage_ino;

/* superblock geometry info */

EXTERN xfs_extlen_t	sb_inoalignmt;
EXTERN __uint32_t	sb_unit;
EXTERN __uint32_t	sb_width;

extern size_t ts_dirbuf_size;
extern size_t ts_dir_freemap_size;
extern size_t ts_attr_freemap_size;

#endif /* _XFS_REPAIR_GLOBAL_H */