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nfsfh.h
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/* * This file describes the layout of the file handles as passed * over the wire. * * Copyright (C) 1995, 1996, 1997 Olaf Kirch <okir@monad.swb.de> */ #ifndef _LINUX_NFSD_FH_H #define _LINUX_NFSD_FH_H #include <linux/types.h> #include <linux/nfs.h> #include <linux/nfs2.h> #include <linux/nfs3.h> #include <linux/nfs4.h> /* * This is the old "dentry style" Linux NFSv2 file handle. * * The xino and xdev fields are currently used to transport the * ino/dev of the exported inode. */ struct nfs_fhbase_old { __u32 fb_dcookie; /* dentry cookie - always 0xfeebbaca */ __u32 fb_ino; /* our inode number */ __u32 fb_dirino; /* dir inode number, 0 for directories */ __u32 fb_dev; /* our device */ __u32 fb_xdev; __u32 fb_xino; __u32 fb_generation; }; /* * This is the new flexible, extensible style NFSv2/v3/v4 file handle. * by Neil Brown <neilb@cse.unsw.edu.au> - March 2000 * * The file handle starts with a sequence of four-byte words. * The first word contains a version number (1) and three descriptor bytes * that tell how the remaining 3 variable length fields should be handled. * These three bytes are auth_type, fsid_type and fileid_type. * * All four-byte values are in host-byte-order. * * The auth_type field is deprecated and must be set to 0. * * The fsid_type identifies how the filesystem (or export point) is * encoded. * Current values: * 0 - 4 byte device id (ms-2-bytes major, ls-2-bytes minor), 4byte inode number * NOTE: we cannot use the kdev_t device id value, because kdev_t.h * says we mustn't. We must break it up and reassemble. * 1 - 4 byte user specified identifier * 2 - 4 byte major, 4 byte minor, 4 byte inode number - DEPRECATED * 3 - 4 byte device id, encoded for user-space, 4 byte inode number * 4 - 4 byte inode number and 4 byte uuid * 5 - 8 byte uuid * 6 - 16 byte uuid * 7 - 8 byte inode number and 16 byte uuid * * The fileid_type identified how the file within the filesystem is encoded. * The values for this field are filesystem specific, exccept that * filesystems must not use the values '0' or '0xff'. 'See enum fid_type' * in include/linux/exportfs.h for currently registered values. */ struct nfs_fhbase_new { __u8 fb_version; /* == 1, even => nfs_fhbase_old */ __u8 fb_auth_type; __u8 fb_fsid_type; __u8 fb_fileid_type; __u32 fb_auth[1]; /* __u32 fb_fsid[0]; floating */ /* __u32 fb_fileid[0]; floating */ }; struct knfsd_fh { unsigned int fh_size; /* significant for NFSv3. * Points to the current size while building * a new file handle */ union { struct nfs_fhbase_old fh_old; __u32 fh_pad[NFS4_FHSIZE/4]; struct nfs_fhbase_new fh_new; } fh_base; }; #define ofh_dcookie fh_base.fh_old.fb_dcookie #define ofh_ino fh_base.fh_old.fb_ino #define ofh_dirino fh_base.fh_old.fb_dirino #define ofh_dev fh_base.fh_old.fb_dev #define ofh_xdev fh_base.fh_old.fb_xdev #define ofh_xino fh_base.fh_old.fb_xino #define ofh_generation fh_base.fh_old.fb_generation #define fh_version fh_base.fh_new.fb_version #define fh_fsid_type fh_base.fh_new.fb_fsid_type #define fh_auth_type fh_base.fh_new.fb_auth_type #define fh_fileid_type fh_base.fh_new.fb_fileid_type #define fh_fsid fh_base.fh_new.fb_auth /* Do not use, provided for userspace compatiblity. */ #define fh_auth fh_base.fh_new.fb_auth #endif /* _LINUX_NFSD_FH_H */