2 * include/linux/nfsd/const.h
4 * Various constants related to NFS.
6 * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
9 #ifndef _LINUX_NFSD_CONST_H
10 #define _LINUX_NFSD_CONST_H
12 #include <linux/nfs.h>
13 #include <linux/nfs2.h>
14 #include <linux/nfs3.h>
15 #include <linux/nfs4.h>
16 #include <linux/sunrpc/msg_prot.h>
19 * Maximum protocol version supported by knfsd
21 #define NFSSVC_MAXVERS 3
24 * Maximum blocksize supported by daemon currently at 32K
26 #define NFSSVC_MAXBLKSIZE (32*1024)
27 /* NFSv2 is limited by the protocol specification, see RFC 1094 */
28 #define NFSSVC_MAXBLKSIZE_V2 (8*1024)
32 #ifndef NFS_SUPER_MAGIC
33 # define NFS_SUPER_MAGIC 0x6969
37 * Largest number of bytes we need to allocate for an NFS
38 * call or reply. Used to control buffer sizes. We use
39 * the length of v3 WRITE, READDIR and READDIR replies
40 * which are an RPC header, up to 26 XDR units of reply
41 * data, and some page data.
43 * Note that accuracy here doesn't matter too much as the
44 * size is rounded up to a page size when allocating space.
46 #define NFSD_BUFSIZE ((RPC_MAX_HEADER_WITH_AUTH+26)*XDR_UNIT + NFSSVC_MAXBLKSIZE)
49 # define NFSSVC_XDRSIZE NFS4_SVC_XDRSIZE
50 #elif defined(CONFIG_NFSD_V3)
51 # define NFSSVC_XDRSIZE NFS3_SVC_XDRSIZE
53 # define NFSSVC_XDRSIZE NFS2_SVC_XDRSIZE
56 #endif /* __KERNEL__ */
58 #endif /* _LINUX_NFSD_CONST_H */