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/cred.h> 12 #include <linux/sunrpc/auth.h> 13 #include <linux/sunrpc/msg_prot.h> 14 #include <linux/string.h> 15 #include <linux/crc32.h> 16 #include <uapi/linux/nfs.h> 17 18 /* The LOCALIO program is entirely private to Linux and is 19 * NOT part of the uapi. 20 */ 21 #define NFS_LOCALIO_PROGRAM 400122 22 #define LOCALIOPROC_NULL 0 23 #define LOCALIOPROC_UUID_IS_LOCAL 1 24 25 /* 26 * This is the kernel NFS client file handle representation 27 */ 28 #define NFS_MAXFHSIZE 128 29 struct nfs_fh { 30 unsigned short size; 31 unsigned char data[NFS_MAXFHSIZE]; 32 }; 33 34 /* 35 * Returns a zero iff the size and data fields match. 36 * Checks only "size" bytes in the data field. 37 */ nfs_compare_fh(const struct nfs_fh * a,const struct nfs_fh * b)38 static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b) 39 { 40 return a->size != b->size || memcmp(a->data, b->data, a->size) != 0; 41 } 42 nfs_copy_fh(struct nfs_fh * target,const struct nfs_fh * source)43 static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source) 44 { 45 target->size = source->size; 46 memcpy(target->data, source->data, source->size); 47 } 48 49 enum nfs3_stable_how { 50 NFS_UNSTABLE = 0, 51 NFS_DATA_SYNC = 1, 52 NFS_FILE_SYNC = 2, 53 54 /* used by direct.c to mark verf as invalid */ 55 NFS_INVALID_STABLE_HOW = -1 56 }; 57 58 #ifdef CONFIG_CRC32 59 /** 60 * nfs_fhandle_hash - calculate the crc32 hash for the filehandle 61 * @fh - pointer to filehandle 62 * 63 * returns a crc32 hash for the filehandle that is compatible with 64 * the one displayed by "wireshark". 65 */ nfs_fhandle_hash(const struct nfs_fh * fh)66 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 67 { 68 return ~crc32_le(0xFFFFFFFF, &fh->data[0], fh->size); 69 } 70 #else /* CONFIG_CRC32 */ nfs_fhandle_hash(const struct nfs_fh * fh)71 static inline u32 nfs_fhandle_hash(const struct nfs_fh *fh) 72 { 73 return 0; 74 } 75 #endif /* CONFIG_CRC32 */ 76 #endif /* _LINUX_NFS_H */ 77