LXR linux/include/linux/nfs.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2/*
   3 * NFS protocol definitions
   4 *
   5 * This file contains constants mostly for Version 2 of the protocol,
   6 * but also has a couple of NFSv3 bits in (notably the error codes).
   7 */
   8#ifndef _LINUX_NFS_H
   9#define _LINUX_NFS_H
  10
  11#include <linux/sunrpc/msg_prot.h>
  12#include <linux/string.h>
  13#include <uapi/linux/nfs.h>
  14
  15/*
  16 * This is the kernel NFS client file handle representation
  17 */
  18#define NFS_MAXFHSIZE           128
  19struct nfs_fh {
  20        unsigned short          size;
  21        unsigned char           data[NFS_MAXFHSIZE];
  22};
  23
  24/*
  25 * Returns a zero iff the size and data fields match.
  26 * Checks only "size" bytes in the data field.
  27 */
  28static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b)
  29{
  30        return a->size != b->size || memcmp(a->data, b->data, a->size) != 0;
  31}
  32
  33static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source)
  34{
  35        target->size = source->size;
  36        memcpy(target->data, source->data, source->size);
  37}
  38
  39
  40/*
  41 * This is really a general kernel constant, but since nothing like
  42 * this is defined in the kernel headers, I have to do it here.
  43 */
  44#define NFS_OFFSET_MAX          ((__s64)((~(__u64)0) >> 1))
  45
  46
  47enum nfs3_stable_how {
  48        NFS_UNSTABLE = 0,
  49        NFS_DATA_SYNC = 1,
  50        NFS_FILE_SYNC = 2,
  51
  52        /* used by direct.c to mark verf as invalid */
  53        NFS_INVALID_STABLE_HOW = -1
  54};
  55#endif /* _LINUX_NFS_H */
  56