/* SPDX-License-Identifier: GPL-2.0 */

  /*
   * NFS protocol definitions
   *
   * This file contains constants mostly for Version 2 of the protocol,
   * but also has a couple of NFSv3 bits in (notably the error codes).
   */
  #ifndef _LINUX_NFS_H
  #define _LINUX_NFS_H

  #include <linux/sunrpc/msg_prot.h>
  #include <linux/string.h>

  #include <uapi/linux/nfs.h>

  /*
   * This is the kernel NFS client file handle representation
   */
  #define NFS_MAXFHSIZE		128
  struct nfs_fh {
  	unsigned short		size;
  	unsigned char		data[NFS_MAXFHSIZE];
  };
  
  /*
   * Returns a zero iff the size and data fields match.
   * Checks only "size" bytes in the data field.
   */
  static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b)
  {
  	return a->size != b->size || memcmp(a->data, b->data, a->size) != 0;
  }
  
  static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source)
  {
  	target->size = source->size;
  	memcpy(target->data, source->data, source->size);
  }
  
  
  /*
   * This is really a general kernel constant, but since nothing like
   * this is defined in the kernel headers, I have to do it here.
   */
  #define NFS_OFFSET_MAX		((__s64)((~(__u64)0) >> 1))
  
  
  enum nfs3_stable_how {
  	NFS_UNSTABLE = 0,
  	NFS_DATA_SYNC = 1,

  	NFS_FILE_SYNC = 2,
  
  	/* used by direct.c to mark verf as invalid */
  	NFS_INVALID_STABLE_HOW = -1

  };

  #endif /* _LINUX_NFS_H */