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![](/assets/img/avatar_default.png "\\"Talpey, Thomas\"){kind=avatar}
4f22ccc346
Adds a flag word to the xdrbuf struct which indicates any bulk disposition of the data. This enables RPC transport providers to marshal it efficiently/appropriately, and may enable other optimizations. Signed-off-by: Tom Talpey <tmt@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
225 lines
7.2 KiB
C
225 lines
7.2 KiB
C
/*
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* include/linux/sunrpc/xdr.h
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*
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* Copyright (C) 1995-1997 Olaf Kirch <okir@monad.swb.de>
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*/
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#ifndef _SUNRPC_XDR_H_
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#define _SUNRPC_XDR_H_
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#ifdef __KERNEL__
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#include <linux/uio.h>
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#include <asm/byteorder.h>
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#include <linux/scatterlist.h>
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#include <linux/smp_lock.h>
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/*
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* Buffer adjustment
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*/
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#define XDR_QUADLEN(l) (((l) + 3) >> 2)
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/*
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* Generic opaque `network object.' At the kernel level, this type
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* is used only by lockd.
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*/
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#define XDR_MAX_NETOBJ 1024
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struct xdr_netobj {
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unsigned int len;
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u8 * data;
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};
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/*
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* This is the generic XDR function. rqstp is either a rpc_rqst (client
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* side) or svc_rqst pointer (server side).
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* Encode functions always assume there's enough room in the buffer.
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*/
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typedef int (*kxdrproc_t)(void *rqstp, __be32 *data, void *obj);
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/*
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* We're still requiring the BKL in the xdr code until it's been
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* more carefully audited, at which point this wrapper will become
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* unnecessary.
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*/
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static inline int rpc_call_xdrproc(kxdrproc_t xdrproc, void *rqstp, __be32 *data, void *obj)
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{
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int ret;
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lock_kernel();
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ret = xdrproc(rqstp, data, obj);
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unlock_kernel();
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return ret;
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}
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/*
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* Basic structure for transmission/reception of a client XDR message.
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* Features a header (for a linear buffer containing RPC headers
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* and the data payload for short messages), and then an array of
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* pages.
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* The tail iovec allows you to append data after the page array. Its
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* main interest is for appending padding to the pages in order to
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* satisfy the int_32-alignment requirements in RFC1832.
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*
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* For the future, we might want to string several of these together
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* in a list if anybody wants to make use of NFSv4 COMPOUND
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* operations and/or has a need for scatter/gather involving pages.
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*/
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struct xdr_buf {
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struct kvec head[1], /* RPC header + non-page data */
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tail[1]; /* Appended after page data */
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struct page ** pages; /* Array of contiguous pages */
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unsigned int page_base, /* Start of page data */
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page_len, /* Length of page data */
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flags; /* Flags for data disposition */
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#define XDRBUF_READ 0x01 /* target of file read */
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#define XDRBUF_WRITE 0x02 /* source of file write */
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unsigned int buflen, /* Total length of storage buffer */
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len; /* Length of XDR encoded message */
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};
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/*
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* pre-xdr'ed macros.
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*/
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#define xdr_zero __constant_htonl(0)
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#define xdr_one __constant_htonl(1)
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#define xdr_two __constant_htonl(2)
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#define rpc_success __constant_htonl(RPC_SUCCESS)
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#define rpc_prog_unavail __constant_htonl(RPC_PROG_UNAVAIL)
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#define rpc_prog_mismatch __constant_htonl(RPC_PROG_MISMATCH)
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#define rpc_proc_unavail __constant_htonl(RPC_PROC_UNAVAIL)
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#define rpc_garbage_args __constant_htonl(RPC_GARBAGE_ARGS)
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#define rpc_system_err __constant_htonl(RPC_SYSTEM_ERR)
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#define rpc_drop_reply __constant_htonl(RPC_DROP_REPLY)
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#define rpc_auth_ok __constant_htonl(RPC_AUTH_OK)
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#define rpc_autherr_badcred __constant_htonl(RPC_AUTH_BADCRED)
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#define rpc_autherr_rejectedcred __constant_htonl(RPC_AUTH_REJECTEDCRED)
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#define rpc_autherr_badverf __constant_htonl(RPC_AUTH_BADVERF)
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#define rpc_autherr_rejectedverf __constant_htonl(RPC_AUTH_REJECTEDVERF)
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#define rpc_autherr_tooweak __constant_htonl(RPC_AUTH_TOOWEAK)
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#define rpcsec_gsserr_credproblem __constant_htonl(RPCSEC_GSS_CREDPROBLEM)
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#define rpcsec_gsserr_ctxproblem __constant_htonl(RPCSEC_GSS_CTXPROBLEM)
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#define rpc_autherr_oldseqnum __constant_htonl(101)
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/*
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* Miscellaneous XDR helper functions
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*/
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__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
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__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
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__be32 *xdr_encode_string(__be32 *p, const char *s);
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__be32 *xdr_decode_string_inplace(__be32 *p, char **sp, int *lenp, int maxlen);
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__be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
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__be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
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void xdr_encode_pages(struct xdr_buf *, struct page **, unsigned int,
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unsigned int);
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void xdr_inline_pages(struct xdr_buf *, unsigned int,
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struct page **, unsigned int, unsigned int);
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static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
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{
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return xdr_encode_opaque(p, s, len);
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}
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/*
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* Decode 64bit quantities (NFSv3 support)
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*/
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static inline __be32 *
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xdr_encode_hyper(__be32 *p, __u64 val)
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{
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*p++ = htonl(val >> 32);
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*p++ = htonl(val & 0xFFFFFFFF);
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return p;
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}
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static inline __be32 *
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xdr_decode_hyper(__be32 *p, __u64 *valp)
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{
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*valp = ((__u64) ntohl(*p++)) << 32;
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*valp |= ntohl(*p++);
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return p;
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}
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/*
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* Adjust kvec to reflect end of xdr'ed data (RPC client XDR)
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*/
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static inline int
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xdr_adjust_iovec(struct kvec *iov, __be32 *p)
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{
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return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
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}
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/*
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* XDR buffer helper functions
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*/
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extern void xdr_shift_buf(struct xdr_buf *, size_t);
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extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
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extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
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extern int xdr_buf_read_netobj(struct xdr_buf *, struct xdr_netobj *, unsigned int);
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extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
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extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
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/*
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* Helper structure for copying from an sk_buff.
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*/
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struct xdr_skb_reader {
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struct sk_buff *skb;
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unsigned int offset;
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size_t count;
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__wsum csum;
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};
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typedef size_t (*xdr_skb_read_actor)(struct xdr_skb_reader *desc, void *to, size_t len);
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size_t xdr_skb_read_bits(struct xdr_skb_reader *desc, void *to, size_t len);
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extern int csum_partial_copy_to_xdr(struct xdr_buf *, struct sk_buff *);
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extern ssize_t xdr_partial_copy_from_skb(struct xdr_buf *, unsigned int,
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struct xdr_skb_reader *, xdr_skb_read_actor);
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extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
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extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
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struct xdr_array2_desc;
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typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
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struct xdr_array2_desc {
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unsigned int elem_size;
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unsigned int array_len;
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unsigned int array_maxlen;
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xdr_xcode_elem_t xcode;
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};
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extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
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struct xdr_array2_desc *desc);
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extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
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struct xdr_array2_desc *desc);
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/*
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* Provide some simple tools for XDR buffer overflow-checking etc.
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*/
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struct xdr_stream {
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__be32 *p; /* start of available buffer */
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struct xdr_buf *buf; /* XDR buffer to read/write */
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__be32 *end; /* end of available buffer space */
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struct kvec *iov; /* pointer to the current kvec */
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};
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extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
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extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
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extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
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unsigned int base, unsigned int len);
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extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p);
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extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
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extern void xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
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extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
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extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
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#endif /* __KERNEL__ */
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#endif /* _SUNRPC_XDR_H_ */
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