1 /* 2 * This file describes the layout of the file handles as passed 3 * over the wire. 4 * 5 * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir (at) monad.swb.de> 6 */ 7 8 #ifndef _UAPI_LINUX_NFSD_FH_H 9 #define _UAPI_LINUX_NFSD_FH_H 10 11 #include <linux/types.h> 12 #include <linux/nfs.h> 13 #include <linux/nfs2.h> 14 #include <linux/nfs3.h> 15 #include <linux/nfs4.h> 16 17 /* 18 * This is the old "dentry style" Linux NFSv2 file handle. 19 * 20 * The xino and xdev fields are currently used to transport the 21 * ino/dev of the exported inode. 22 */ 23 struct nfs_fhbase_old { 24 __u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */ 25 __u32 fb_ino; /* our inode number */ 26 __u32 fb_dirino; /* dir inode number, 0 for directories */ 27 __u32 fb_dev; /* our device */ 28 __u32 fb_xdev; 29 __u32 fb_xino; 30 __u32 fb_generation; 31 }; 32 33 /* 34 * This is the new flexible, extensible style NFSv2/v3/v4 file handle. 35 * by Neil Brown <neilb (at) cse.unsw.edu.au> - March 2000 36 * 37 * The file handle starts with a sequence of four-byte words. 38 * The first word contains a version number (1) and three descriptor bytes 39 * that tell how the remaining 3 variable length fields should be handled. 40 * These three bytes are auth_type, fsid_type and fileid_type. 41 * 42 * All four-byte values are in host-byte-order. 43 * 44 * The auth_type field is deprecated and must be set to 0. 45 * 46 * The fsid_type identifies how the filesystem (or export point) is 47 * encoded. 48 * Current values: 49 * 0 - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number 50 * NOTE: we cannot use the kdev_t device id value, because kdev_t.h 51 * says we mustn't. We must break it up and reassemble. 52 * 1 - 4 byte user specified identifier 53 * 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED 54 * 3 - 4 byte device id, encoded for user-space, 4 byte inode number 55 * 4 - 4 byte inode number and 4 byte uuid 56 * 5 - 8 byte uuid 57 * 6 - 16 byte uuid 58 * 7 - 8 byte inode number and 16 byte uuid 59 * 60 * The fileid_type identified how the file within the filesystem is encoded. 61 * The values for this field are filesystem specific, exccept that 62 * filesystems must not use the values '0' or '0xff'. 'See enum fid_type' 63 * in include/linux/exportfs.h for currently registered values. 64 */ 65 struct nfs_fhbase_new { 66 __u8 fb_version; /* == 1, even => nfs_fhbase_old */ 67 __u8 fb_auth_type; 68 __u8 fb_fsid_type; 69 __u8 fb_fileid_type; 70 __u32 fb_auth[1]; 71 /* __u32 fb_fsid[0]; floating */ 72 /* __u32 fb_fileid[0]; floating */ 73 }; 74 75 struct knfsd_fh { 76 unsigned int fh_size; /* significant for NFSv3. 77 * Points to the current size while building 78 * a new file handle 79 */ 80 union { 81 struct nfs_fhbase_old fh_old; 82 __u32 fh_pad[NFS4_FHSIZE/4]; 83 struct nfs_fhbase_new fh_new; 84 } fh_base; 85 }; 86 87 #define ofh_dcookie fh_base.fh_old.fb_dcookie 88 #define ofh_ino fh_base.fh_old.fb_ino 89 #define ofh_dirino fh_base.fh_old.fb_dirino 90 #define ofh_dev fh_base.fh_old.fb_dev 91 #define ofh_xdev fh_base.fh_old.fb_xdev 92 #define ofh_xino fh_base.fh_old.fb_xino 93 #define ofh_generation fh_base.fh_old.fb_generation 94 95 #define fh_version fh_base.fh_new.fb_version 96 #define fh_fsid_type fh_base.fh_new.fb_fsid_type 97 #define fh_auth_type fh_base.fh_new.fb_auth_type 98 #define fh_fileid_type fh_base.fh_new.fb_fileid_type 99 #define fh_fsid fh_base.fh_new.fb_auth 100 101 /* Do not use, provided for userspace compatiblity. */ 102 #define fh_auth fh_base.fh_new.fb_auth 103 104 #endif /* _UAPI_LINUX_NFSD_FH_H */ 105
