1 files changed, 192 insertions, 0 deletions

diff --git a/include/linux/sunrpc/xdr.h b/include/linux/sunrpc/xdr.h
new file mode 100644
index 000000000000..541dcf838abf
--- /dev/null
+++ b/include/linux/sunrpc/xdr.h
@@ -0,0 +1,192 @@
+/*
+ * include/linux/sunrpc/xdr.h
+ *
+ * Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
+ */
+
+#ifndef _SUNRPC_XDR_H_
+#define _SUNRPC_XDR_H_
+
+#ifdef __KERNEL__
+
+#include <linux/uio.h>
+#include <asm/byteorder.h>
+
+/*
+ * Buffer adjustment
+ */
+#define XDR_QUADLEN(l)          (((l) + 3) >> 2)
+
+/*
+ * Generic opaque `network object.' At the kernel level, this type
+ * is used only by lockd.
+ */
+#define XDR_MAX_NETOBJ          1024
+struct xdr_netobj {
+        unsigned int            len;
+        u8 *                    data;
+};
+
+/*
+ * This is the generic XDR function. rqstp is either a rpc_rqst (client
+ * side) or svc_rqst pointer (server side).
+ * Encode functions always assume there's enough room in the buffer.
+ */
+typedef int     (*kxdrproc_t)(void *rqstp, u32 *data, void *obj);
+
+/*
+ * Basic structure for transmission/reception of a client XDR message.
+ * Features a header (for a linear buffer containing RPC headers
+ * and the data payload for short messages), and then an array of
+ * pages.
+ * The tail iovec allows you to append data after the page array. Its
+ * main interest is for appending padding to the pages in order to
+ * satisfy the int_32-alignment requirements in RFC1832.
+ *
+ * For the future, we might want to string several of these together
+ * in a list if anybody wants to make use of NFSv4 COMPOUND
+ * operations and/or has a need for scatter/gather involving pages.
+ */
+struct xdr_buf {
+        struct kvec     head[1],        /* RPC header + non-page data */
+                        tail[1];        /* Appended after page data */
+
+        struct page **  pages;          /* Array of contiguous pages */
+        unsigned int    page_base,      /* Start of page data */
+                        page_len;       /* Length of page data */
+
+        unsigned int    buflen,         /* Total length of storage buffer */
+                        len;            /* Length of XDR encoded message */
+
+};
+
+/*
+ * pre-xdr'ed macros.
+ */
+
+#define xdr_zero        __constant_htonl(0)
+#define xdr_one         __constant_htonl(1)
+#define xdr_two         __constant_htonl(2)
+
+#define rpc_success             __constant_htonl(RPC_SUCCESS)
+#define rpc_prog_unavail        __constant_htonl(RPC_PROG_UNAVAIL)
+#define rpc_prog_mismatch       __constant_htonl(RPC_PROG_MISMATCH)
+#define rpc_proc_unavail        __constant_htonl(RPC_PROC_UNAVAIL)
+#define rpc_garbage_args        __constant_htonl(RPC_GARBAGE_ARGS)
+#define rpc_system_err          __constant_htonl(RPC_SYSTEM_ERR)
+
+#define rpc_auth_ok             __constant_htonl(RPC_AUTH_OK)
+#define rpc_autherr_badcred     __constant_htonl(RPC_AUTH_BADCRED)
+#define rpc_autherr_rejectedcred __constant_htonl(RPC_AUTH_REJECTEDCRED)
+#define rpc_autherr_badverf     __constant_htonl(RPC_AUTH_BADVERF)
+#define rpc_autherr_rejectedverf __constant_htonl(RPC_AUTH_REJECTEDVERF)
+#define rpc_autherr_tooweak     __constant_htonl(RPC_AUTH_TOOWEAK)
+#define rpcsec_gsserr_credproblem       __constant_htonl(RPCSEC_GSS_CREDPROBLEM)
+#define rpcsec_gsserr_ctxproblem        __constant_htonl(RPCSEC_GSS_CTXPROBLEM)
+#define rpc_autherr_oldseqnum   __constant_htonl(101)
+
+/*
+ * Miscellaneous XDR helper functions
+ */
+u32 *   xdr_encode_opaque_fixed(u32 *p, const void *ptr, unsigned int len);
+u32 *   xdr_encode_opaque(u32 *p, const void *ptr, unsigned int len);
+u32 *   xdr_encode_string(u32 *p, const char *s);
+u32 *   xdr_decode_string(u32 *p, char **sp, int *lenp, int maxlen);
+u32 *   xdr_decode_string_inplace(u32 *p, char **sp, int *lenp, int maxlen);
+u32 *   xdr_encode_netobj(u32 *p, const struct xdr_netobj *);
+u32 *   xdr_decode_netobj(u32 *p, struct xdr_netobj *);
+
+void    xdr_encode_pages(struct xdr_buf *, struct page **, unsigned int,
+                         unsigned int);
+void    xdr_inline_pages(struct xdr_buf *, unsigned int,
+                         struct page **, unsigned int, unsigned int);
+
+static inline u32 *xdr_encode_array(u32 *p, const void *s, unsigned int len)
+{
+        return xdr_encode_opaque(p, s, len);
+}
+
+/*
+ * Decode 64bit quantities (NFSv3 support)
+ */
+static inline u32 *
+xdr_encode_hyper(u32 *p, __u64 val)
+{
+        *p++ = htonl(val >> 32);
+        *p++ = htonl(val & 0xFFFFFFFF);
+        return p;
+}
+
+static inline u32 *
+xdr_decode_hyper(u32 *p, __u64 *valp)
+{
+        *valp  = ((__u64) ntohl(*p++)) << 32;
+        *valp |= ntohl(*p++);
+        return p;
+}
+
+/*
+ * Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
+ */
+static inline int
+xdr_adjust_iovec(struct kvec *iov, u32 *p)
+{
+        return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
+}
+
+/*
+ * Maximum number of iov's we use.
+ */
+#define MAX_IOVEC       (12)
+
+/*
+ * XDR buffer helper functions
+ */
+extern void xdr_shift_buf(struct xdr_buf *, size_t);
+extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
+extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, int, int);
+extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, int);
+extern int read_bytes_from_xdr_buf(struct xdr_buf *buf, int base, void *obj, int len);
+
+/*
+ * Helper structure for copying from an sk_buff.
+ */
+typedef struct {
+        struct sk_buff  *skb;
+        unsigned int    offset;
+        size_t          count;
+        unsigned int    csum;
+} skb_reader_t;
+
+typedef size_t (*skb_read_actor_t)(skb_reader_t *desc, void *to, size_t len);
+
+extern void xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
+                skb_reader_t *, skb_read_actor_t);
+
+struct socket;
+struct sockaddr;
+extern int xdr_sendpages(struct socket *, struct sockaddr *, int,
+                struct xdr_buf *, unsigned int, int);
+
+/*
+ * Provide some simple tools for XDR buffer overflow-checking etc.
+ */
+struct xdr_stream {
+        uint32_t *p;            /* start of available buffer */
+        struct xdr_buf *buf;    /* XDR buffer to read/write */
+
+        uint32_t *end;          /* end of available buffer space */
+        struct kvec *iov;       /* pointer to the current kvec */
+};
+
+extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, uint32_t *p);
+extern uint32_t *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
+extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
+                unsigned int base, unsigned int len);
+extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, uint32_t *p);
+extern uint32_t *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
+extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
+
+#endif /* __KERNEL__ */
+
+#endif /* _SUNRPC_XDR_H_ */