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11#ifndef _SUNRPC_XDR_H_
12#define _SUNRPC_XDR_H_
13
14#include <linux/uio.h>
15#include <asm/byteorder.h>
16#include <asm/unaligned.h>
17#include <linux/scatterlist.h>
18
19struct bio_vec;
20struct rpc_rqst;
21
22
23
24
25#define XDR_QUADLEN(l) (((l) + 3) >> 2)
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30
31#define XDR_MAX_NETOBJ 1024
32struct xdr_netobj {
33 unsigned int len;
34 u8 * data;
35};
36
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49
50struct xdr_buf {
51 struct kvec head[1],
52 tail[1];
53
54 struct bio_vec *bvec;
55 struct page ** pages;
56 unsigned int page_base,
57 page_len,
58 flags;
59#define XDRBUF_READ 0x01
60#define XDRBUF_WRITE 0x02
61#define XDRBUF_SPARSE_PAGES 0x04
62
63 unsigned int buflen,
64 len;
65};
66
67static inline void
68xdr_buf_init(struct xdr_buf *buf, void *start, size_t len)
69{
70 buf->head[0].iov_base = start;
71 buf->head[0].iov_len = len;
72 buf->tail[0].iov_len = 0;
73 buf->pages = NULL;
74 buf->page_len = 0;
75 buf->flags = 0;
76 buf->len = 0;
77 buf->buflen = len;
78}
79
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81
82
83
84#define xdr_zero cpu_to_be32(0)
85#define xdr_one cpu_to_be32(1)
86#define xdr_two cpu_to_be32(2)
87
88#define rpc_auth_null cpu_to_be32(RPC_AUTH_NULL)
89#define rpc_auth_unix cpu_to_be32(RPC_AUTH_UNIX)
90#define rpc_auth_short cpu_to_be32(RPC_AUTH_SHORT)
91#define rpc_auth_gss cpu_to_be32(RPC_AUTH_GSS)
92
93#define rpc_call cpu_to_be32(RPC_CALL)
94#define rpc_reply cpu_to_be32(RPC_REPLY)
95
96#define rpc_msg_accepted cpu_to_be32(RPC_MSG_ACCEPTED)
97
98#define rpc_success cpu_to_be32(RPC_SUCCESS)
99#define rpc_prog_unavail cpu_to_be32(RPC_PROG_UNAVAIL)
100#define rpc_prog_mismatch cpu_to_be32(RPC_PROG_MISMATCH)
101#define rpc_proc_unavail cpu_to_be32(RPC_PROC_UNAVAIL)
102#define rpc_garbage_args cpu_to_be32(RPC_GARBAGE_ARGS)
103#define rpc_system_err cpu_to_be32(RPC_SYSTEM_ERR)
104#define rpc_drop_reply cpu_to_be32(RPC_DROP_REPLY)
105
106#define rpc_mismatch cpu_to_be32(RPC_MISMATCH)
107#define rpc_auth_error cpu_to_be32(RPC_AUTH_ERROR)
108
109#define rpc_auth_ok cpu_to_be32(RPC_AUTH_OK)
110#define rpc_autherr_badcred cpu_to_be32(RPC_AUTH_BADCRED)
111#define rpc_autherr_rejectedcred cpu_to_be32(RPC_AUTH_REJECTEDCRED)
112#define rpc_autherr_badverf cpu_to_be32(RPC_AUTH_BADVERF)
113#define rpc_autherr_rejectedverf cpu_to_be32(RPC_AUTH_REJECTEDVERF)
114#define rpc_autherr_tooweak cpu_to_be32(RPC_AUTH_TOOWEAK)
115#define rpcsec_gsserr_credproblem cpu_to_be32(RPCSEC_GSS_CREDPROBLEM)
116#define rpcsec_gsserr_ctxproblem cpu_to_be32(RPCSEC_GSS_CTXPROBLEM)
117
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119
120
121__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int len);
122__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int len);
123__be32 *xdr_encode_string(__be32 *p, const char *s);
124__be32 *xdr_decode_string_inplace(__be32 *p, char **sp, unsigned int *lenp,
125 unsigned int maxlen);
126__be32 *xdr_encode_netobj(__be32 *p, const struct xdr_netobj *);
127__be32 *xdr_decode_netobj(__be32 *p, struct xdr_netobj *);
128
129void xdr_inline_pages(struct xdr_buf *, unsigned int,
130 struct page **, unsigned int, unsigned int);
131void xdr_terminate_string(struct xdr_buf *, const u32);
132size_t xdr_buf_pagecount(struct xdr_buf *buf);
133int xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp);
134void xdr_free_bvec(struct xdr_buf *buf);
135
136static inline __be32 *xdr_encode_array(__be32 *p, const void *s, unsigned int len)
137{
138 return xdr_encode_opaque(p, s, len);
139}
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143
144static inline __be32 *
145xdr_encode_hyper(__be32 *p, __u64 val)
146{
147 put_unaligned_be64(val, p);
148 return p + 2;
149}
150
151static inline __be32 *
152xdr_decode_hyper(__be32 *p, __u64 *valp)
153{
154 *valp = get_unaligned_be64(p);
155 return p + 2;
156}
157
158static inline __be32 *
159xdr_decode_opaque_fixed(__be32 *p, void *ptr, unsigned int len)
160{
161 memcpy(ptr, p, len);
162 return p + XDR_QUADLEN(len);
163}
164
165static inline void xdr_netobj_dup(struct xdr_netobj *dst,
166 struct xdr_netobj *src, gfp_t gfp_mask)
167{
168 dst->data = kmemdup(src->data, src->len, gfp_mask);
169 dst->len = src->len;
170}
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174
175static inline int
176xdr_adjust_iovec(struct kvec *iov, __be32 *p)
177{
178 return iov->iov_len = ((u8 *) p - (u8 *) iov->iov_base);
179}
180
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183
184extern void xdr_shift_buf(struct xdr_buf *, size_t);
185extern void xdr_buf_from_iov(struct kvec *, struct xdr_buf *);
186extern int xdr_buf_subsegment(struct xdr_buf *, struct xdr_buf *, unsigned int, unsigned int);
187extern void xdr_buf_trim(struct xdr_buf *, unsigned int);
188extern int read_bytes_from_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
189extern int write_bytes_to_xdr_buf(struct xdr_buf *, unsigned int, void *, unsigned int);
190
191extern int xdr_encode_word(struct xdr_buf *, unsigned int, u32);
192extern int xdr_decode_word(struct xdr_buf *, unsigned int, u32 *);
193
194struct xdr_array2_desc;
195typedef int (*xdr_xcode_elem_t)(struct xdr_array2_desc *desc, void *elem);
196struct xdr_array2_desc {
197 unsigned int elem_size;
198 unsigned int array_len;
199 unsigned int array_maxlen;
200 xdr_xcode_elem_t xcode;
201};
202
203extern int xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
204 struct xdr_array2_desc *desc);
205extern int xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
206 struct xdr_array2_desc *desc);
207extern void _copy_from_pages(char *p, struct page **pages, size_t pgbase,
208 size_t len);
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212
213struct xdr_stream {
214 __be32 *p;
215 struct xdr_buf *buf;
216
217 __be32 *end;
218 struct kvec *iov;
219 struct kvec scratch;
220 struct page **page_ptr;
221 unsigned int nwords;
222
223 struct rpc_rqst *rqst;
224};
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229typedef void (*kxdreproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
230 const void *obj);
231typedef int (*kxdrdproc_t)(struct rpc_rqst *rqstp, struct xdr_stream *xdr,
232 void *obj);
233
234extern void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf,
235 __be32 *p, struct rpc_rqst *rqst);
236extern __be32 *xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes);
237extern int xdr_reserve_space_vec(struct xdr_stream *xdr, struct kvec *vec,
238 size_t nbytes);
239extern void xdr_commit_encode(struct xdr_stream *xdr);
240extern void xdr_truncate_encode(struct xdr_stream *xdr, size_t len);
241extern int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen);
242extern void xdr_write_pages(struct xdr_stream *xdr, struct page **pages,
243 unsigned int base, unsigned int len);
244extern unsigned int xdr_stream_pos(const struct xdr_stream *xdr);
245extern unsigned int xdr_page_pos(const struct xdr_stream *xdr);
246extern void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf,
247 __be32 *p, struct rpc_rqst *rqst);
248extern void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
249 struct page **pages, unsigned int len);
250extern void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen);
251extern __be32 *xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes);
252extern unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len);
253extern void xdr_enter_page(struct xdr_stream *xdr, unsigned int len);
254extern int xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len, int (*actor)(struct scatterlist *, void *), void *data);
255extern uint64_t xdr_align_data(struct xdr_stream *, uint64_t, uint32_t);
256extern uint64_t xdr_expand_hole(struct xdr_stream *, uint64_t, uint64_t);
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265static inline size_t
266xdr_stream_remaining(const struct xdr_stream *xdr)
267{
268 return xdr->nwords << 2;
269}
270
271ssize_t xdr_stream_decode_opaque(struct xdr_stream *xdr, void *ptr,
272 size_t size);
273ssize_t xdr_stream_decode_opaque_dup(struct xdr_stream *xdr, void **ptr,
274 size_t maxlen, gfp_t gfp_flags);
275ssize_t xdr_stream_decode_string(struct xdr_stream *xdr, char *str,
276 size_t size);
277ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
278 size_t maxlen, gfp_t gfp_flags);
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286static inline size_t
287xdr_align_size(size_t n)
288{
289 const size_t mask = sizeof(__u32) - 1;
290
291 return (n + mask) & ~mask;
292}
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304static inline size_t xdr_pad_size(size_t n)
305{
306 return xdr_align_size(n) - n;
307}
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317static inline ssize_t xdr_stream_encode_item_present(struct xdr_stream *xdr)
318{
319 const size_t len = sizeof(__be32);
320 __be32 *p = xdr_reserve_space(xdr, len);
321
322 if (unlikely(!p))
323 return -EMSGSIZE;
324 *p = xdr_one;
325 return len;
326}
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336static inline int xdr_stream_encode_item_absent(struct xdr_stream *xdr)
337{
338 const size_t len = sizeof(__be32);
339 __be32 *p = xdr_reserve_space(xdr, len);
340
341 if (unlikely(!p))
342 return -EMSGSIZE;
343 *p = xdr_zero;
344 return len;
345}
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356static inline ssize_t
357xdr_stream_encode_u32(struct xdr_stream *xdr, __u32 n)
358{
359 const size_t len = sizeof(n);
360 __be32 *p = xdr_reserve_space(xdr, len);
361
362 if (unlikely(!p))
363 return -EMSGSIZE;
364 *p = cpu_to_be32(n);
365 return len;
366}
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377static inline ssize_t
378xdr_stream_encode_u64(struct xdr_stream *xdr, __u64 n)
379{
380 const size_t len = sizeof(n);
381 __be32 *p = xdr_reserve_space(xdr, len);
382
383 if (unlikely(!p))
384 return -EMSGSIZE;
385 xdr_encode_hyper(p, n);
386 return len;
387}
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399static inline ssize_t
400xdr_stream_encode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t len)
401{
402 size_t count = sizeof(__u32) + xdr_align_size(len);
403 __be32 *p = xdr_reserve_space(xdr, count);
404
405 if (unlikely(!p)) {
406 *ptr = NULL;
407 return -EMSGSIZE;
408 }
409 xdr_encode_opaque(p, NULL, len);
410 *ptr = ++p;
411 return count;
412}
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424static inline ssize_t
425xdr_stream_encode_opaque_fixed(struct xdr_stream *xdr, const void *ptr, size_t len)
426{
427 __be32 *p = xdr_reserve_space(xdr, len);
428
429 if (unlikely(!p))
430 return -EMSGSIZE;
431 xdr_encode_opaque_fixed(p, ptr, len);
432 return xdr_align_size(len);
433}
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445static inline ssize_t
446xdr_stream_encode_opaque(struct xdr_stream *xdr, const void *ptr, size_t len)
447{
448 size_t count = sizeof(__u32) + xdr_align_size(len);
449 __be32 *p = xdr_reserve_space(xdr, count);
450
451 if (unlikely(!p))
452 return -EMSGSIZE;
453 xdr_encode_opaque(p, ptr, len);
454 return count;
455}
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467static inline ssize_t
468xdr_stream_encode_uint32_array(struct xdr_stream *xdr,
469 const __u32 *array, size_t array_size)
470{
471 ssize_t ret = (array_size+1) * sizeof(__u32);
472 __be32 *p = xdr_reserve_space(xdr, ret);
473
474 if (unlikely(!p))
475 return -EMSGSIZE;
476 *p++ = cpu_to_be32(array_size);
477 for (; array_size > 0; p++, array++, array_size--)
478 *p = cpu_to_be32p(array);
479 return ret;
480}
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490static inline bool xdr_item_is_absent(const __be32 *p)
491{
492 return *p == xdr_zero;
493}
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503static inline bool xdr_item_is_present(const __be32 *p)
504{
505 return *p != xdr_zero;
506}
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517static inline ssize_t
518xdr_stream_decode_u32(struct xdr_stream *xdr, __u32 *ptr)
519{
520 const size_t count = sizeof(*ptr);
521 __be32 *p = xdr_inline_decode(xdr, count);
522
523 if (unlikely(!p))
524 return -EBADMSG;
525 *ptr = be32_to_cpup(p);
526 return 0;
527}
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539static inline ssize_t
540xdr_stream_decode_opaque_fixed(struct xdr_stream *xdr, void *ptr, size_t len)
541{
542 __be32 *p = xdr_inline_decode(xdr, len);
543
544 if (unlikely(!p))
545 return -EBADMSG;
546 xdr_decode_opaque_fixed(p, ptr, len);
547 return len;
548}
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566static inline ssize_t
567xdr_stream_decode_opaque_inline(struct xdr_stream *xdr, void **ptr, size_t maxlen)
568{
569 __be32 *p;
570 __u32 len;
571
572 *ptr = NULL;
573 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
574 return -EBADMSG;
575 if (len != 0) {
576 p = xdr_inline_decode(xdr, len);
577 if (unlikely(!p))
578 return -EBADMSG;
579 if (unlikely(len > maxlen))
580 return -EMSGSIZE;
581 *ptr = p;
582 }
583 return len;
584}
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597static inline ssize_t
598xdr_stream_decode_uint32_array(struct xdr_stream *xdr,
599 __u32 *array, size_t array_size)
600{
601 __be32 *p;
602 __u32 len;
603 ssize_t retval;
604
605 if (unlikely(xdr_stream_decode_u32(xdr, &len) < 0))
606 return -EBADMSG;
607 p = xdr_inline_decode(xdr, len * sizeof(*p));
608 if (unlikely(!p))
609 return -EBADMSG;
610 if (array == NULL)
611 return len;
612 if (len <= array_size) {
613 if (len < array_size)
614 memset(array+len, 0, (array_size-len)*sizeof(*array));
615 array_size = len;
616 retval = len;
617 } else
618 retval = -EMSGSIZE;
619 for (; array_size > 0; p++, array++, array_size--)
620 *array = be32_to_cpup(p);
621 return retval;
622}
623
624#endif
625