1 // SPDX-License-Identifier: GPL-2.0 2 /* 3 * Copyright (c) 2005 Silicon Graphics, Inc. 4 * All Rights Reserved. 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 45 * practice this means when exporting an XFS filesystem with 64bit 46 * inodes you should either export the mountpoint (rather than 47 * a subdirectory) or use the "fsid" export option. 48 */ 49 50 struct xfs_fid64 { 51 u64 ino; 52 u32 gen; 53 u64 parent_ino; 54 u32 parent_gen; 55 } __attribute__((packed)); 56 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 60 #endif /* __XFS_EXPORT_H__ */ 61