1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0 2*4882a593Smuzhiyun /* 3*4882a593Smuzhiyun * Copyright (c) 2005 Silicon Graphics, Inc. 4*4882a593Smuzhiyun * All Rights Reserved. 5*4882a593Smuzhiyun */ 6*4882a593Smuzhiyun #ifndef __XFS_EXPORT_H__ 7*4882a593Smuzhiyun #define __XFS_EXPORT_H__ 8*4882a593Smuzhiyun 9*4882a593Smuzhiyun /* 10*4882a593Smuzhiyun * Common defines for code related to exporting XFS filesystems over NFS. 11*4882a593Smuzhiyun * 12*4882a593Smuzhiyun * The NFS fileid goes out on the wire as an array of 13*4882a593Smuzhiyun * 32bit unsigned ints in host order. There are 5 possible 14*4882a593Smuzhiyun * formats. 15*4882a593Smuzhiyun * 16*4882a593Smuzhiyun * (1) fileid_type=0x00 17*4882a593Smuzhiyun * (no fileid data; handled by the generic code) 18*4882a593Smuzhiyun * 19*4882a593Smuzhiyun * (2) fileid_type=0x01 20*4882a593Smuzhiyun * inode-num 21*4882a593Smuzhiyun * generation 22*4882a593Smuzhiyun * 23*4882a593Smuzhiyun * (3) fileid_type=0x02 24*4882a593Smuzhiyun * inode-num 25*4882a593Smuzhiyun * generation 26*4882a593Smuzhiyun * parent-inode-num 27*4882a593Smuzhiyun * parent-generation 28*4882a593Smuzhiyun * 29*4882a593Smuzhiyun * (4) fileid_type=0x81 30*4882a593Smuzhiyun * inode-num-lo32 31*4882a593Smuzhiyun * inode-num-hi32 32*4882a593Smuzhiyun * generation 33*4882a593Smuzhiyun * 34*4882a593Smuzhiyun * (5) fileid_type=0x82 35*4882a593Smuzhiyun * inode-num-lo32 36*4882a593Smuzhiyun * inode-num-hi32 37*4882a593Smuzhiyun * generation 38*4882a593Smuzhiyun * parent-inode-num-lo32 39*4882a593Smuzhiyun * parent-inode-num-hi32 40*4882a593Smuzhiyun * parent-generation 41*4882a593Smuzhiyun * 42*4882a593Smuzhiyun * Note, the NFS filehandle also includes an fsid portion which 43*4882a593Smuzhiyun * may have an inode number in it. That number is hardcoded to 44*4882a593Smuzhiyun * 32bits and there is no way for XFS to intercept it. In 45*4882a593Smuzhiyun * practice this means when exporting an XFS filesystem with 64bit 46*4882a593Smuzhiyun * inodes you should either export the mountpoint (rather than 47*4882a593Smuzhiyun * a subdirectory) or use the "fsid" export option. 48*4882a593Smuzhiyun */ 49*4882a593Smuzhiyun 50*4882a593Smuzhiyun struct xfs_fid64 { 51*4882a593Smuzhiyun u64 ino; 52*4882a593Smuzhiyun u32 gen; 53*4882a593Smuzhiyun u64 parent_ino; 54*4882a593Smuzhiyun u32 parent_gen; 55*4882a593Smuzhiyun } __attribute__((packed)); 56*4882a593Smuzhiyun 57*4882a593Smuzhiyun /* This flag goes on the wire. Don't play with it. */ 58*4882a593Smuzhiyun #define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */ 59*4882a593Smuzhiyun 60*4882a593Smuzhiyun #endif /* __XFS_EXPORT_H__ */ 61