| 1 | /* SPDX-License-Identifier: GPL-2.0 */ |
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| 2 | /* |
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| 3 | * NFS protocol definitions |
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| 4 | * |
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| 5 | * This file contains constants mostly for Version 2 of the protocol, |
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| 6 | * but also has a couple of NFSv3 bits in (notably the error codes). |
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| 7 | */ |
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| 8 | #ifndef _LINUX_NFS_H |
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| 9 | #define _LINUX_NFS_H |
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| 10 | |
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| 11 | #include <linux/cred.h> |
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| 12 | #include <linux/sunrpc/auth.h> |
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| 13 | #include <linux/sunrpc/msg_prot.h> |
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| 14 | #include <linux/string.h> |
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| 15 | #include <linux/crc32.h> |
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| 16 | #include <uapi/linux/nfs.h> |
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| 17 | |
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| 18 | /* The LOCALIO program is entirely private to Linux and is |
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| 19 | * NOT part of the uapi. |
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| 20 | */ |
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| 21 | #define NFS_LOCALIO_PROGRAM 400122 |
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| 22 | #define LOCALIOPROC_NULL 0 |
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| 23 | #define LOCALIOPROC_UUID_IS_LOCAL 1 |
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| 24 | |
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| 25 | /* |
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| 26 | * This is the kernel NFS client file handle representation |
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| 27 | */ |
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| 28 | #define NFS_MAXFHSIZE 128 |
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| 29 | struct nfs_fh { |
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| 30 | unsigned short size; |
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| 31 | unsigned char data[NFS_MAXFHSIZE]; |
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| 32 | }; |
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| 33 | |
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| 34 | /* |
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| 35 | * Returns a zero iff the size and data fields match. |
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| 36 | * Checks only "size" bytes in the data field. |
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| 37 | */ |
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| 38 | static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b) |
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| 39 | { |
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| 40 | return a->size != b->size || memcmp(p: a->data, q: b->data, size: a->size) != 0; |
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| 41 | } |
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| 42 | |
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| 43 | static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source) |
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| 44 | { |
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| 45 | target->size = source->size; |
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| 46 | memcpy(target->data, source->data, source->size); |
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| 47 | } |
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| 48 | |
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| 49 | enum nfs3_stable_how { |
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| 50 | NFS_UNSTABLE = 0, |
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| 51 | NFS_DATA_SYNC = 1, |
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| 52 | NFS_FILE_SYNC = 2, |
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| 53 | |
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| 54 | /* used by direct.c to mark verf as invalid */ |
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| 55 | NFS_INVALID_STABLE_HOW = -1 |
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| 56 | }; |
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| 57 | |
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| 58 | /** |
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| 59 | * nfs_fhandle_hash - calculate the crc32 hash for the filehandle |
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| 60 | * @fh - pointer to filehandle |
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| 61 | * |
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| 62 | * returns a crc32 hash for the filehandle that is compatible with |
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| 63 | * the one displayed by "wireshark". |
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| 64 | */ |
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| 65 | static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) |
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| 66 | { |
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| 67 | return ~crc32_le(crc: 0xFFFFFFFF, p: &fh->data[0], len: fh->size); |
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| 68 | } |
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| 69 | #endif /* _LINUX_NFS_H */ |
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| 70 | |
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