include/linux/nfs.h

   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
  18 struct 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  */
  27 static 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
  32 static 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
  46 enum 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 */