[linux-2.6-block.git] / fs / xfs / xfs_export.h

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#ifndef __XFS_EXPORT_H__
#define __XFS_EXPORT_H__

/*
 * Common defines for code related to exporting XFS filesystems over NFS.
 *
 * The NFS fileid goes out on the wire as an array of
 * 32bit unsigned ints in host order.  There are 5 possible
 * formats.
 *
 * (1)	fileid_type=0x00
 *	(no fileid data; handled by the generic code)
 *
 * (2)	fileid_type=0x01
 *	inode-num
 *	generation
 *
 * (3)	fileid_type=0x02
 *	inode-num
 *	generation
 *	parent-inode-num
 *	parent-generation
 *
 * (4)	fileid_type=0x81
 *	inode-num-lo32
 *	inode-num-hi32
 *	generation
 *
 * (5)	fileid_type=0x82
 *	inode-num-lo32
 *	inode-num-hi32
 *	generation
 *	parent-inode-num-lo32
 *	parent-inode-num-hi32
 *	parent-generation
 *
 * Note, the NFS filehandle also includes an fsid portion which
 * may have an inode number in it.  That number is hardcoded to
 * 32bits and there is no way for XFS to intercept it.  In
 * practice this means when exporting an XFS filesystem with 64bit
 * inodes you should either export the mountpoint (rather than
 * a subdirectory) or use the "fsid" export option.
 */

struct xfs_fid64 {
	u64 ino;
	u32 gen;
	u64 parent_ino;
	u32 parent_gen;
} __attribute__((packed));

/* This flag goes on the wire.  Don't play with it. */
#define XFS_FILEID_TYPE_64FLAG	0x80	/* NFS fileid has 64bit inodes */

#endif	/* __XFS_EXPORT_H__ */
Commit	Line	Data
0b61f8a4	1	// SPDX-License-Identifier: GPL-2.0
1da177e4	2	/*
7b718769 NS	3	* Copyright (c) 2005 Silicon Graphics, Inc.
7b718769 NS	4	* All Rights Reserved.
1da177e4 LT	5	*/
	6	#ifndef __XFS_EXPORT_H__
	7	#define __XFS_EXPORT_H__
	8
	9	/*
	10	* Common defines for code related to exporting XFS filesystems over NFS.
	11	*
	12	* The NFS fileid goes out on the wire as an array of
	13	* 32bit unsigned ints in host order. There are 5 possible
	14	* formats.
	15	*
	16	* (1) fileid_type=0x00
	17	* (no fileid data; handled by the generic code)
	18	*
	19	* (2) fileid_type=0x01
	20	* inode-num
	21	* generation
	22	*
	23	* (3) fileid_type=0x02
	24	* inode-num
	25	* generation
	26	* parent-inode-num
	27	* parent-generation
	28	*
	29	* (4) fileid_type=0x81
	30	* inode-num-lo32
	31	* inode-num-hi32
	32	* generation
	33	*
	34	* (5) fileid_type=0x82
	35	* inode-num-lo32
	36	* inode-num-hi32
	37	* generation
	38	* parent-inode-num-lo32
	39	* parent-inode-num-hi32
	40	* parent-generation
	41	*
	42	* Note, the NFS filehandle also includes an fsid portion which
	43	* may have an inode number in it. That number is hardcoded to
	44	* 32bits and there is no way for XFS to intercept it. In
c41564b5	45	* practice this means when exporting an XFS filesystem with 64bit
1da177e4 LT	46	* inodes you should either export the mountpoint (rather than
	47	* a subdirectory) or use the "fsid" export option.
	48	*/
	49
c38344fe CH	50	struct xfs_fid64 {
	51	u64 ino;
	52	u32 gen;
	53	u64 parent_ino;
	54	u32 parent_gen;
	55	} __attribute__((packed));
	56
1da177e4 LT	57	/* This flag goes on the wire. Don't play with it. */
	58	#define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */
	59
1da177e4	60	#endif /* __XFS_EXPORT_H__ */