xfs_fs.h

linux得一些常用命令,以及linux环境下的c编程

/*
 * Copyright (c) 1995-2001 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2.1 of the GNU Lesser 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 Lesser 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 _LINUX_XFS_FS_H
#define _LINUX_XFS_FS_H

#include <linux/types.h>
#include <asm/ioctl.h>


/*
 * SGI's XFS filesystem's major stuff (constants, structures)
 */

#define XFS_SUPER_MAGIC 0x58465342
#define XFS_NAME	"xfs"

/* 
 * Direct I/O attribute record used with XFS_IOC_DIOINFO
 * d_miniosz is the min xfer size, xfer size multiple and file seek offset
 * alignment.
 */
struct dioattr {
	__u32		d_mem;		/* data buffer memory alignment	*/
	__u32		d_miniosz;	/* min xfer size		*/
	__u32		d_maxiosz;	/* max xfer size		*/
};

/*
 * Structure for XFS_IOC_FSGETXATTR[A] and XFS_IOC_FSSETXATTR.
 */
struct fsxattr {
	__u32	 	fsx_xflags;	/* xflags field value (get/set)	*/
	__u32	 	fsx_extsize;	/* extsize field value (get/set)*/
	__u32	 	fsx_nextents;	/* nextents field value (get)	*/
	unsigned char	fsx_pad[16];
};

/*
 * Flags for the bs_xflags/fsx_xflags field
 * There should be a one-to-one correspondence between these flags and the
 * XFS_DIFLAG_s.
 */
#define	XFS_XFLAG_REALTIME	0x00000001
#define	XFS_XFLAG_PREALLOC	0x00000002
#define	XFS_XFLAG_HASATTR	0x80000000      /* no DIFLAG for this	*/
#define	XFS_XFLAG_ALL           \
	( XFS_XFLAG_REALTIME|XFS_XFLAG_PREALLOC|XFS_XFLAG_HASATTR )


/*
 * Structure for XFS_IOC_GETBMAP.
 * On input, fill in bmv_offset and bmv_length of the first structure
 * to indicate the area of interest in the file, and bmv_entry with the
 * number of array elements given.  The first structure is updated on
 * return to give the offset and length for the next call.
 */
struct getbmap {
	__s64		bmv_offset;	/* file offset of segment in blocks */
	__s64		bmv_block;	/* starting block (64-bit daddr_t)  */
	__s64		bmv_length;	/* length of segment, blocks	    */
	__s32		bmv_count;	/* # of entries in array incl. 1st  */
	__s32		bmv_entries;	/* # of entries filled in (output)  */
};

/*
 *	Structure for XFS_IOC_GETBMAPX.  Fields bmv_offset through bmv_entries
 *	are used exactly as in the getbmap structure.  The getbmapx structure
 *	has additional bmv_iflags and bmv_oflags fields. The bmv_iflags field
 *	is only used for the first structure.  It contains input flags 
 *	specifying XFS_IOC_GETBMAPX actions.  The bmv_oflags field is filled
 *	in by the XFS_IOC_GETBMAPX command for each returned structure after
 *	the first.
 */
struct getbmapx {
	__s64		bmv_offset;	/* file offset of segment in blocks */
	__s64		bmv_block;	/* starting block (64-bit daddr_t)  */
	__s64		bmv_length;	/* length of segment, blocks	    */
	__s32		bmv_count;	/* # of entries in array incl. 1st  */
	__s32		bmv_entries;	/* # of entries filled in (output). */
	__s32		bmv_iflags;	/* input flags (1st structure)	    */
	__s32		bmv_oflags;	/* output flags (after 1st structure)*/
	__s32		bmv_unused1;	/* future use			    */
	__s32		bmv_unused2;	/* future use			    */
};

/*	bmv_iflags values - set by XFS_IOC_GETBMAPX caller.	*/
#define	BMV_IF_ATTRFORK		0x1	/* return attr fork rather than data */
#define BMV_IF_NO_DMAPI_READ	0x2	/* Do not generate DMAPI read event  */
#define BMV_IF_PREALLOC		0x4	/* rtn status BMV_OF_PREALLOC if req */
#define BMV_IF_VALID	(BMV_IF_ATTRFORK|BMV_IF_NO_DMAPI_READ|BMV_IF_PREALLOC)
#ifdef __KERNEL__
#define	BMV_IF_EXTENDED	0x40000000	/* getpmapx if set */
#endif

/*	bmv_oflags values - returned for for each non-header segment */
#define BMV_OF_PREALLOC		0x1	/* segment = unwritten pre-allocation */

/*	Convert getbmap <-> getbmapx - move fields from p1 to p2. */
#define	GETBMAP_CONVERT(p1,p2) {	\
	p2.bmv_offset = p1.bmv_offset;	\
	p2.bmv_block = p1.bmv_block;	\
	p2.bmv_length = p1.bmv_length;	\
	p2.bmv_count = p1.bmv_count;	\
	p2.bmv_entries = p1.bmv_entries;  }


/*
 * Structure for XFS_IOC_FSSETDM.
 * For use by backup and restore programs to set the XFS on-disk inode
 * fields di_dmevmask and di_dmstate.  These must be set to exactly and
 * only values previously obtained via xfs_bulkstat!  (Specifically the
 * xfs_bstat_t fields bs_dmevmask and bs_dmstate.)
 */
struct fsdmidata {
	__u32		fsd_dmevmask;	/* corresponds to di_dmevmask */
	__u16		fsd_padding;
	__u16		fsd_dmstate;	/* corresponds to di_dmstate  */
};

/*
 * File segment locking set data type for 64 bit access.
 * Also used for all the RESV/FREE interfaces.
 */
typedef struct xfs_flock64 {
	__s16		l_type;
	__s16		l_whence;
	__s64		l_start;
	__s64		l_len;		/* len == 0 means until end of file */
        __s32		l_sysid;
        pid_t		l_pid;
	__s32		l_pad[4];	/* reserve area			    */
} xfs_flock64_t;

/*
 * Output for XFS_IOC_FSGEOMETRY
 */
typedef struct xfs_fsop_geom {
	__u32		blocksize;	/* filesystem (data) block size	*/
	__u32		rtextsize;	/* realtime extent size		*/
	__u32		agblocks;	/* fsblocks in an AG		*/
	__u32		agcount;	/* number of allocation groups  */
	__u32		logblocks;	/* fsblocks in the log		*/
	__u32		sectsize;	/* (data) sector size, bytes	*/
	__u32		inodesize;	/* inode size in bytes		*/
	__u32		imaxpct;	/* max allowed inode space(%)	*/
	__u64		datablocks;	/* fsblocks in data subvolume	*/
	__u64		rtblocks;	/* fsblocks in realtime subvol	*/
	__u64		rtextents;	/* rt extents in realtime subvol*/
	__u64		logstart;	/* starting fsblock of the log	*/
	unsigned char	uuid[16];	/* unique id of the filesystem	*/
	__u32		sunit;		/* stripe unit, fsblocks	*/
	__u32		swidth;		/* stripe width, fsblocks	*/
	__s32		version;	/* structure version		*/
	__u32		flags;		/* superblock version flags	*/
	__u32		logsectsize;	/* log sector size, bytes	*/
	__u32		rtsectsize;	/* realtime sector size, bytes	*/
	__u32		dirblocksize;	/* directory block size, bytes	*/
} xfs_fsop_geom_t;

/* Output for XFS_FS_COUNTS */
typedef struct xfs_fsop_counts {
	__u64	freedata;	/* free data section blocks */
	__u64	freertx;	/* free rt extents */
	__u64	freeino;	/* free inodes */
	__u64	allocino;	/* total allocated inodes */
} xfs_fsop_counts_t;

/* Input/Output for XFS_GET_RESBLKS and XFS_SET_RESBLKS */
typedef struct xfs_fsop_resblks {
	__u64  resblks;
	__u64  resblks_avail;
} xfs_fsop_resblks_t;

#define	XFS_FSOP_GEOM_VERSION	0

#define	XFS_FSOP_GEOM_FLAGS_ATTR	0x01	/* attributes in use	*/
#define	XFS_FSOP_GEOM_FLAGS_NLINK	0x02	/* 32-bit nlink values	*/
#define	XFS_FSOP_GEOM_FLAGS_QUOTA	0x04	/* quotas enabled	*/
#define	XFS_FSOP_GEOM_FLAGS_IALIGN	0x08	/* inode alignment	*/
#define	XFS_FSOP_GEOM_FLAGS_DALIGN	0x10	/* large data alignment	*/
#define	XFS_FSOP_GEOM_FLAGS_SHARED	0x20	/* read-only shared	*/
#define	XFS_FSOP_GEOM_FLAGS_EXTFLG	0x40	/* special extent flag	*/
#define	XFS_FSOP_GEOM_FLAGS_DIRV2	0x80	/* directory version 2	*/


/*
 * Minimum and maximum sizes need for growth checks
 */
#define	XFS_MIN_AG_BLOCKS	64
#define	XFS_MIN_LOG_BLOCKS	512
#define	XFS_MAX_LOG_BLOCKS	(64 * 1024)
#define	XFS_MIN_LOG_BYTES	(256 * 1024)
#define	XFS_MAX_LOG_BYTES	(128 * 1024 * 1024)

/*
 * Structures for XFS_IOC_FSGROWFSDATA, XFS_IOC_FSGROWFSLOG & XFS_IOC_FSGROWFSRT
 */
typedef struct xfs_growfs_data {
	__u64		newblocks;	/* new data subvol size, fsblocks */
	__u32		imaxpct;	/* new inode space percentage limit */
} xfs_growfs_data_t;

typedef struct xfs_growfs_log {
	__u32		newblocks;	/* new log size, fsblocks */
	__u32		isint;		/* 1 if new log is internal */
} xfs_growfs_log_t;

typedef struct xfs_growfs_rt {
	__u64		newblocks;	/* new realtime size, fsblocks */
	__u32		extsize;	/* new realtime extent size, fsblocks */
} xfs_growfs_rt_t;