Commit | Line | Data |
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b2441318 | 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
1da177e4 LT |
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 | ||
997b7af2 DW |
11 | #include <linux/sunrpc/msg_prot.h> |
12 | #include <linux/string.h> | |
e59fb674 | 13 | #include <linux/crc32.h> |
607ca46e | 14 | #include <uapi/linux/nfs.h> |
997b7af2 | 15 | |
1da177e4 LT |
16 | /* |
17 | * This is the kernel NFS client file handle representation | |
18 | */ | |
19 | #define NFS_MAXFHSIZE 128 | |
20 | struct nfs_fh { | |
21 | unsigned short size; | |
22 | unsigned char data[NFS_MAXFHSIZE]; | |
23 | }; | |
24 | ||
25 | /* | |
26 | * Returns a zero iff the size and data fields match. | |
27 | * Checks only "size" bytes in the data field. | |
28 | */ | |
29 | static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b) | |
30 | { | |
31 | return a->size != b->size || memcmp(a->data, b->data, a->size) != 0; | |
32 | } | |
33 | ||
34 | static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source) | |
35 | { | |
36 | target->size = source->size; | |
37 | memcpy(target->data, source->data, source->size); | |
38 | } | |
39 | ||
1da177e4 LT |
40 | enum nfs3_stable_how { |
41 | NFS_UNSTABLE = 0, | |
42 | NFS_DATA_SYNC = 1, | |
5002c586 WAA |
43 | NFS_FILE_SYNC = 2, |
44 | ||
45 | /* used by direct.c to mark verf as invalid */ | |
46 | NFS_INVALID_STABLE_HOW = -1 | |
1da177e4 | 47 | }; |
e59fb674 JL |
48 | |
49 | #ifdef CONFIG_CRC32 | |
50 | /** | |
51 | * nfs_fhandle_hash - calculate the crc32 hash for the filehandle | |
52 | * @fh - pointer to filehandle | |
53 | * | |
54 | * returns a crc32 hash for the filehandle that is compatible with | |
55 | * the one displayed by "wireshark". | |
56 | */ | |
57 | static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) | |
58 | { | |
59 | return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); | |
60 | } | |
61 | #else /* CONFIG_CRC32 */ | |
62 | static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) | |
63 | { | |
64 | return 0; | |
65 | } | |
66 | #endif /* CONFIG_CRC32 */ | |
1da177e4 | 67 | #endif /* _LINUX_NFS_H */ |