1 /* 2 * NFS protocol definitions 3 * 4 * This file contains constants mostly for Version 2 of the protocol, 5 * but also has a couple of NFSv3 bits in (notably the error codes). 6 */ 7 #ifndef _LINUX_NFS_H 8 #define _LINUX_NFS_H 9 10 #include <linux/sunrpc/msg_prot.h> 11 #include <linux/string.h> 12 #include <uapi/linux/nfs.h> 13 14 /* 15 * This is the kernel NFS client file handle representation 16 */ 17 #define NFS_MAXFHSIZE 128 18 struct nfs_fh { 19 unsigned short size; 20 unsigned char data[NFS_MAXFHSIZE]; 21 }; 22 23 /* 24 * Returns a zero iff the size and data fields match. 25 * Checks only "size" bytes in the data field. 26 */ 27 static inline int nfs_compare_fh(const struct nfs_fh *a, const struct nfs_fh *b) 28 { 29 return a->size != b->size || memcmp(a->data, b->data, a->size) != 0; 30 } 31 32 static inline void nfs_copy_fh(struct nfs_fh *target, const struct nfs_fh *source) 33 { 34 target->size = source->size; 35 memcpy(target->data, source->data, source->size); 36 } 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 46 enum nfs3_stable_how { 47 NFS_UNSTABLE = 0, 48 NFS_DATA_SYNC = 1, 49 NFS_FILE_SYNC = 2, 50 51 /* used by direct.c to mark verf as invalid */ 52 NFS_INVALID_STABLE_HOW = -1 53 }; 54 #endif /* _LINUX_NFS_H */ 55