1 /* 2 * Copyright (c) 2005 Silicon Graphics, Inc. 3 * All Rights Reserved. 4 * 5 * This program is free software; you can redistribute it and/or 6 * modify it under the terms of the GNU General Public License as 7 * published by the Free Software Foundation. 8 * 9 * This program is distributed in the hope that it would be useful, 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 12 * GNU General Public License for more details. 13 * 14 * You should have received a copy of the GNU General Public License 15 * along with this program; if not, write the Free Software Foundation, 16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 17 */ 18 #ifndef __XFS_EXPORT_H__ 19 #define __XFS_EXPORT_H__ 20 21 /* 22 * Common defines for code related to exporting XFS filesystems over NFS. 23 * 24 * The NFS fileid goes out on the wire as an array of 25 * 32bit unsigned ints in host order. There are 5 possible 26 * formats. 27 * 28 * (1) fileid_type=0x00 29 * (no fileid data; handled by the generic code) 30 * 31 * (2) fileid_type=0x01 32 * inode-num 33 * generation 34 * 35 * (3) fileid_type=0x02 36 * inode-num 37 * generation 38 * parent-inode-num 39 * parent-generation 40 * 41 * (4) fileid_type=0x81 42 * inode-num-lo32 43 * inode-num-hi32 44 * generation 45 * 46 * (5) fileid_type=0x82 47 * inode-num-lo32 48 * inode-num-hi32 49 * generation 50 * parent-inode-num-lo32 51 * parent-inode-num-hi32 52 * parent-generation 53 * 54 * Note, the NFS filehandle also includes an fsid portion which 55 * may have an inode number in it. That number is hardcoded to 56 * 32bits and there is no way for XFS to intercept it. In 57 * practice this means when exporting an XFS filesystem with 64bit 58 * inodes you should either export the mountpoint (rather than 59 * a subdirectory) or use the "fsid" export option. 60 */ 61 62 struct xfs_fid64 { 63 u64 ino; 64 u32 gen; 65 u64 parent_ino; 66 u32 parent_gen; 67 } __attribute__((packed)); 68 69 /* This flag goes on the wire. Don't play with it. */ 70 #define XFS_FILEID_TYPE_64FLAG 0x80 /* NFS fileid has 64bit inodes */ 71 72 #endif /* __XFS_EXPORT_H__ */ 73