tools/brcm/K24/hndtools-mipsel-uclibc-4.1.2/include/linux/sunrpc/xdr.h

   1 /*
   2  * include/linux/sunrpc/xdr.h
   3  *
   4  * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
   5  */
   6
   7 #ifndef _SUNRPC_XDR_H_
   8 #define _SUNRPC_XDR_H_
   9
  10 #ifdef __KERNEL__
  11
  12 #include <linux/uio.h>
  13
  14 /*
  15  * Buffer adjustment
  16  */
  17 #define XDR_QUADLEN(l)          (((l) + 3) >> 2)
  18
  19 /*
  20  * Generic opaque `network object.' At the kernel level, this type
  21  * is used only by lockd.
  22  */
  23 #define XDR_MAX_NETOBJ          1024
  24 struct xdr_netobj {
  25         unsigned int            len;
  26         u8 *                    data;
  27 };
  28
  29 /*
  30  * This is the generic XDR function. rqstp is either a rpc_rqst (client
  31  * side) or svc_rqst pointer (server side).
  32  * Encode functions always assume there's enough room in the buffer.
  33  */
  34 typedef int     (*kxdrproc_t)(void *rqstp, u32 *data, void *obj);
  35
  36 /*
  37  * Basic structure for transmission/reception of a client XDR message.
  38  * Features a header (for a linear buffer containing RPC headers
  39  * and the data payload for short messages), and then an array of
  40  * pages.
  41  * The tail iovec allows you to append data after the page array. Its
  42  * main interest is for appending padding to the pages in order to
  43  * satisfy the int_32-alignment requirements in RFC1832.
  44  *
  45  * For the future, we might want to string several of these together
  46  * in a list if anybody wants to make use of NFSv4 COMPOUND
  47  * operations and/or has a need for scatter/gather involving pages.
  48  */
  49 struct xdr_buf {
  50         struct iovec    head[1],        /* RPC header + non-page data */
  51                         tail[1];        /* Appended after page data */
  52
  53         struct page **  pages;          /* Array of contiguous pages */
  54         unsigned int    page_base,      /* Start of page data */
  55                         page_len;       /* Length of page data */
  56
  57         unsigned int    len;            /* Total length of data */
  58
  59 };
  60
  61 /*
  62  * pre-xdr'ed macros.
  63  */
  64
  65 #define xdr_zero        __constant_htonl(0)
  66 #define xdr_one         __constant_htonl(1)
  67 #define xdr_two         __constant_htonl(2)
  68
  69 #define rpc_success             __constant_htonl(RPC_SUCCESS)
  70 #define rpc_prog_unavail        __constant_htonl(RPC_PROG_UNAVAIL)
  71 #define rpc_prog_mismatch       __constant_htonl(RPC_PROG_MISMATCH)
  72 #define rpc_proc_unavail        __constant_htonl(RPC_PROC_UNAVAIL)
  73 #define rpc_garbage_args        __constant_htonl(RPC_GARBAGE_ARGS)
  74 #define rpc_system_err          __constant_htonl(RPC_SYSTEM_ERR)
  75
  76 #define rpc_auth_ok             __constant_htonl(RPC_AUTH_OK)
  77 #define rpc_autherr_badcred     __constant_htonl(RPC_AUTH_BADCRED)
  78 #define rpc_autherr_rejectedcred __constant_htonl(RPC_AUTH_REJECTEDCRED)
  79 #define rpc_autherr_badverf     __constant_htonl(RPC_AUTH_BADVERF)
  80 #define rpc_autherr_rejectedverf __constant_htonl(RPC_AUTH_REJECTEDVERF)
  81 #define rpc_autherr_tooweak     __constant_htonl(RPC_AUTH_TOOWEAK)
  82
  83
  84 /*
  85  * Miscellaneous XDR helper functions
  86  */
  87 u32 *   xdr_encode_array(u32 *p, const char *s, unsigned int len);
  88 u32 *   xdr_encode_string(u32 *p, const char *s);
  89 u32 *   xdr_decode_string(u32 *p, char **sp, int *lenp, int maxlen);
  90 u32 *   xdr_decode_string_inplace(u32 *p, char **sp, int *lenp, int maxlen);
  91 u32 *   xdr_encode_netobj(u32 *p, const struct xdr_netobj *);
  92 u32 *   xdr_decode_netobj(u32 *p, struct xdr_netobj *);
  93 u32 *   xdr_decode_netobj_fixed(u32 *p, void *obj, unsigned int len);
  94
  95 void    xdr_encode_pages(struct xdr_buf *, struct page **, unsigned int,
  96                          unsigned int);
  97 void    xdr_inline_pages(struct xdr_buf *, unsigned int,
  98                          struct page **, unsigned int, unsigned int);
  99
 100 /*
 101  * Decode 64bit quantities (NFSv3 support)
 102  */
 103 static inline u32 *
 104 xdr_encode_hyper(u32 *p, __u64 val)
 105 {
 106         *p++ = htonl(val >> 32);
 107         *p++ = htonl(val & 0xFFFFFFFF);
 108         return p;
 109 }
 110
 111 static inline u32 *
 112 xdr_decode_hyper(u32 *p, __u64 *valp)
 113 {
 114         *valp  = ((__u64) ntohl(*p++)) << 32;
 115         *valp |= ntohl(*p++);
 116         return p;
 117 }
 118
 119 /*
 120  * Adjust iovec to reflect end of xdr'ed data (RPC client XDR)
 121  */
 122 static inline int
 123 xdr_adjust_iovec(struct iovec *iov, u32 *p)
 124 {
 125         return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
 126 }
 127
 128 void xdr_shift_iovec(struct iovec *, int, size_t);
 129 void xdr_zero_iovec(struct iovec *, int, size_t);
 130
 131 /*
 132  * Maximum number of iov's we use.
 133  */
 134 #define MAX_IOVEC       (12)
 135
 136 /*
 137  * XDR buffer helper functions
 138  */
 139 extern int xdr_kmap(struct iovec *, struct xdr_buf *, unsigned int);
 140 extern void xdr_kunmap(struct xdr_buf *, unsigned int, int);
 141 extern void xdr_shift_buf(struct xdr_buf *, size_t);
 142
 143 /*
 144  * Helper structure for copying from an sk_buff.
 145  */
 146 typedef struct {
 147         struct sk_buff  *skb;
 148         unsigned int    offset;
 149         size_t          count;
 150         unsigned int    csum;
 151 } skb_reader_t;
 152
 153 typedef size_t (*skb_read_actor_t)(skb_reader_t *desc, void *to, size_t len);
 154
 155 extern void xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
 156                 skb_reader_t *, skb_read_actor_t);
 157
 158 extern int xdr_copy_skb(struct xdr_buf *xdr, unsigned int base,
 159                 struct sk_buff *skb, unsigned int offset);
 160
 161 extern int xdr_copy_and_csum_skb(struct xdr_buf *xdr, unsigned int base,
 162                 struct sk_buff *skb, unsigned int offset, unsigned int csum);
 163
 164 #endif /* __KERNEL__ */
 165
 166 #endif /* _SUNRPC_XDR_H_ */