1 /* SPDX-License-Identifier: GPL-2.0 */ 1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* 2 /*
3 * NFS protocol definitions 3 * NFS protocol definitions
4 * 4 *
5 * This file contains constants mostly for Ver 5 * This file contains constants mostly for Version 2 of the protocol,
6 * but also has a couple of NFSv3 bits in (not 6 * but also has a couple of NFSv3 bits in (notably the error codes).
7 */ 7 */
8 #ifndef _LINUX_NFS_H 8 #ifndef _LINUX_NFS_H
9 #define _LINUX_NFS_H 9 #define _LINUX_NFS_H
10 10
11 #include <linux/sunrpc/msg_prot.h> 11 #include <linux/sunrpc/msg_prot.h>
12 #include <linux/string.h> 12 #include <linux/string.h>
13 #include <linux/crc32.h> 13 #include <linux/crc32.h>
14 #include <uapi/linux/nfs.h> 14 #include <uapi/linux/nfs.h>
15 15
16 /* 16 /*
17 * This is the kernel NFS client file handle r 17 * This is the kernel NFS client file handle representation
18 */ 18 */
19 #define NFS_MAXFHSIZE 128 19 #define NFS_MAXFHSIZE 128
20 struct nfs_fh { 20 struct nfs_fh {
21 unsigned short size; 21 unsigned short size;
22 unsigned char data[NFS_MAXFH 22 unsigned char data[NFS_MAXFHSIZE];
23 }; 23 };
24 24
25 /* 25 /*
26 * Returns a zero iff the size and data fields 26 * Returns a zero iff the size and data fields match.
27 * Checks only "size" bytes in the data field. 27 * Checks only "size" bytes in the data field.
28 */ 28 */
29 static inline int nfs_compare_fh(const struct 29 static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b)
30 { 30 {
31 return a->size != b->size || memcmp(a- 31 return a->size != b->size || memcmp(a->data, b->data, a->size) != 0;
32 } 32 }
33 33
34 static inline void nfs_copy_fh(struct nfs_fh * 34 static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source)
35 { 35 {
36 target->size = source->size; 36 target->size = source->size;
37 memcpy(target->data, source->data, sou 37 memcpy(target->data, source->data, source->size);
38 } 38 }
39 39
40 enum nfs3_stable_how { 40 enum nfs3_stable_how {
41 NFS_UNSTABLE = 0, 41 NFS_UNSTABLE = 0,
42 NFS_DATA_SYNC = 1, 42 NFS_DATA_SYNC = 1,
43 NFS_FILE_SYNC = 2, 43 NFS_FILE_SYNC = 2,
44 44
45 /* used by direct.c to mark verf as in 45 /* used by direct.c to mark verf as invalid */
46 NFS_INVALID_STABLE_HOW = -1 46 NFS_INVALID_STABLE_HOW = -1
47 }; 47 };
48 48
49 #ifdef CONFIG_CRC32 49 #ifdef CONFIG_CRC32
50 /** 50 /**
51 * nfs_fhandle_hash - calculate the crc32 hash 51 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle
52 * @fh - pointer to filehandle 52 * @fh - pointer to filehandle
53 * 53 *
54 * returns a crc32 hash for the filehandle tha 54 * returns a crc32 hash for the filehandle that is compatible with
55 * the one displayed by "wireshark". 55 * the one displayed by "wireshark".
56 */ 56 */
57 static inline u32 nfs_fhandle_hash(const struc 57 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
58 { 58 {
59 return ~crc32_le(0xFFFFFFFF, &fh->data 59 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size);
60 } 60 }
61 #else /* CONFIG_CRC32 */ 61 #else /* CONFIG_CRC32 */
62 static inline u32 nfs_fhandle_hash(const struc 62 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh)
63 { 63 {
64 return 0; 64 return 0;
65 } 65 }
66 #endif /* CONFIG_CRC32 */ 66 #endif /* CONFIG_CRC32 */
67 #endif /* _LINUX_NFS_H */ 67 #endif /* _LINUX_NFS_H */
68 68
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