1/* 2 * NFS protocol definitions 3 * 4 * This file contains constants mostly for Version 2 of the protocol, 5 * but also has a couple of NFSv3 bits in (notably the error codes). 6 */ 7#ifndef _LINUX_NFS_H 8#define _LINUX_NFS_H 9 10#include <linux/sunrpc/msg_prot.h> 11#include <linux/string.h> 12#include <uapi/linux/nfs.h> 13 14/* 15 * This is the kernel NFS client file handle representation 16 */ 17#define NFS_MAXFHSIZE 128 18struct nfs_fh { 19 unsigned short size; 20 unsigned char data[NFS_MAXFHSIZE]; 21}; 22 23/* 24 * Returns a zero iff the size and data fields match. 25 * Checks only "size" bytes in the data field. 26 */ 27static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b) 28{ 29 return a->size != b->size || memcmp(a->data, b->data, a->size) != 0; 30} 31 32static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source) 33{ 34 target->size = source->size; 35 memcpy(target->data, source->data, source->size); 36} 37 38 39/* 40 * This is really a general kernel constant, but since nothing like 41 * this is defined in the kernel headers, I have to do it here. 42 */ 43#define NFS_OFFSET_MAX ((__s64)((~(__u64)0) >> 1)) 44 45 46enum nfs3_stable_how { 47 NFS_UNSTABLE = 0, 48 NFS_DATA_SYNC = 1, 49 NFS_FILE_SYNC = 2, 50 51 /* used by direct.c to mark verf as invalid */ 52 NFS_INVALID_STABLE_HOW = -1 53}; 54#endif /* _LINUX_NFS_H */ 55