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 <linux/crc32.h> |
14 | #include <uapi/linux/nfs.h> |
15 | |
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(p: a->data, q: b->data, size: 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 | |
40 | enum nfs3_stable_how { |
41 | NFS_UNSTABLE = 0, |
42 | NFS_DATA_SYNC = 1, |
43 | NFS_FILE_SYNC = 2, |
44 | |
45 | /* used by direct.c to mark verf as invalid */ |
46 | NFS_INVALID_STABLE_HOW = -1 |
47 | }; |
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(crc: 0xFFFFFFFF, p: &fh->data[0], len: 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 */ |
67 | #endif /* _LINUX_NFS_H */ |
68 | |