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