xfs_fs.h

linux 内核源代码

/*
 * Copyright (c) 1995-2005 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 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.  See the
 * GNU Lesser General Public License for more details.
 *
 * 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.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#ifndef __XFS_FS_H__
#define __XFS_FS_H__

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

/*
 * 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.
 */
#ifndef HAVE_DIOATTR
struct dioattr {
	__u32		d_mem;		/* data buffer memory alignment */
	__u32		d_miniosz;	/* min xfer size		*/
	__u32		d_maxiosz;	/* max xfer size		*/
};
#endif

/*
 * Structure for XFS_IOC_FSGETXATTR[A] and XFS_IOC_FSSETXATTR.
 */
#ifndef HAVE_FSXATTR
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)	*/
	__u32		fsx_projid;	/* project identifier (get/set) */
	unsigned char	fsx_pad[12];
};
#endif

/*
 * 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	/* data in realtime volume */
#define XFS_XFLAG_PREALLOC	0x00000002	/* preallocated file extents */
#define XFS_XFLAG_IMMUTABLE	0x00000008	/* file cannot be modified */
#define XFS_XFLAG_APPEND	0x00000010	/* all writes append */
#define XFS_XFLAG_SYNC		0x00000020	/* all writes synchronous */
#define XFS_XFLAG_NOATIME	0x00000040	/* do not update access time */
#define XFS_XFLAG_NODUMP	0x00000080	/* do not include in backups */
#define XFS_XFLAG_RTINHERIT	0x00000100	/* create with rt bit set */
#define XFS_XFLAG_PROJINHERIT	0x00000200	/* create with parents projid */
#define XFS_XFLAG_NOSYMLINKS	0x00000400	/* disallow symlink creation */
#define XFS_XFLAG_EXTSIZE	0x00000800	/* extent size allocator hint */
#define XFS_XFLAG_EXTSZINHERIT	0x00001000	/* inherit inode extent size */
#define XFS_XFLAG_NODEFRAG	0x00002000  	/* do not defragment */
#define XFS_XFLAG_FILESTREAM	0x00004000	/* use filestream allocator */
#define XFS_XFLAG_HASATTR	0x80000000	/* no DIFLAG for this	*/

/*
 * 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_entries with
 * the number of array elements given back.  The first structure is
 * updated on return to give the offset and length for the next call.
 */
#ifndef HAVE_GETBMAP
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)  */
};
#endif

/*
 *	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.
 */
#ifndef HAVE_GETBMAPX
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			    */
};
#endif

/*	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.)
 */
#ifndef HAVE_FSDMIDATA
struct fsdmidata {
	__u32		fsd_dmevmask;	/* corresponds to di_dmevmask */
	__u16		fsd_padding;
	__u16		fsd_dmstate;	/* corresponds to di_dmstate  */
};
#endif

/*
 * 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;
	__u32		l_pid;
	__s32		l_pad[4];	/* reserve area			    */
} xfs_flock64_t;

/*
 * Output for XFS_IOC_FSGEOMETRY_V1
 */
typedef struct xfs_fsop_geom_v1 {
	__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_v1_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	*/
	__u32		logsunit;	/* log stripe unit, 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	0x0001	/* attributes in use	*/
#define XFS_FSOP_GEOM_FLAGS_NLINK	0x0002	/* 32-bit nlink values	*/
#define XFS_FSOP_GEOM_FLAGS_QUOTA	0x0004	/* quotas enabled	*/
#define XFS_FSOP_GEOM_FLAGS_IALIGN	0x0008	/* inode alignment	*/
#define XFS_FSOP_GEOM_FLAGS_DALIGN	0x0010	/* large data alignment */
#define XFS_FSOP_GEOM_FLAGS_SHARED	0x0020	/* read-only shared	*/
#define XFS_FSOP_GEOM_FLAGS_EXTFLG	0x0040	/* special extent flag	*/
#define XFS_FSOP_GEOM_FLAGS_DIRV2	0x0080	/* directory version 2	*/
#define XFS_FSOP_GEOM_FLAGS_LOGV2	0x0100	/* log format version 2	*/
#define XFS_FSOP_GEOM_FLAGS_SECTOR	0x0200	/* sector sizes >1BB	*/
#define XFS_FSOP_GEOM_FLAGS_ATTR2	0x0400	/* inline attributes rework */
#define XFS_FSOP_GEOM_FLAGS_LAZYSB	0x4000	/* lazy superblock counters */


/*
 * Minimum and maximum sizes need for growth checks
 */
#define XFS_MIN_AG_BLOCKS	64
#define XFS_MIN_LOG_BLOCKS	512