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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
David Woodhouse997b7af2006-04-25 14:51:45 +010010#include <linux/sunrpc/msg_prot.h>
11#include <linux/string.h>
David Howells607ca462012-10-13 10:46:48 +010012#include <uapi/linux/nfs.h>
David Woodhouse997b7af2006-04-25 14:51:45 +010013
Linus Torvalds1da177e2005-04-16 15:20:36 -070014/*
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,
Weston Andros Adamson5002c582014-05-15 11:56:54 -040049 NFS_FILE_SYNC = 2,
50
51 /* used by direct.c to mark verf as invalid */
52 NFS_INVALID_STABLE_HOW = -1
Linus Torvalds1da177e2005-04-16 15:20:36 -070053};
Linus Torvalds1da177e2005-04-16 15:20:36 -070054#endif /* _LINUX_NFS_H */