1
2
3
4
5
6
7
8
9
10#include <linux/module.h>
11#include <linux/slab.h>
12#include <linux/types.h>
13#include <linux/string.h>
14#include <linux/kernel.h>
15#include <linux/pagemap.h>
16#include <linux/errno.h>
17#include <linux/sunrpc/xdr.h>
18#include <linux/sunrpc/msg_prot.h>
19#include <linux/bvec.h>
20#include <trace/events/sunrpc.h>
21
22
23
24
25__be32 *
26xdr_encode_netobj(__be32 *p, const struct xdr_netobj *obj)
27{
28 unsigned int quadlen = XDR_QUADLEN(obj->len);
29
30 p[quadlen] = 0;
31 *p++ = cpu_to_be32(obj->len);
32 memcpy(p, obj->data, obj->len);
33 return p + XDR_QUADLEN(obj->len);
34}
35EXPORT_SYMBOL_GPL(xdr_encode_netobj);
36
37__be32 *
38xdr_decode_netobj(__be32 *p, struct xdr_netobj *obj)
39{
40 unsigned int len;
41
42 if ((len = be32_to_cpu(*p++)) > XDR_MAX_NETOBJ)
43 return NULL;
44 obj->len = len;
45 obj->data = (u8 *) p;
46 return p + XDR_QUADLEN(len);
47}
48EXPORT_SYMBOL_GPL(xdr_decode_netobj);
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64__be32 *xdr_encode_opaque_fixed(__be32 *p, const void *ptr, unsigned int nbytes)
65{
66 if (likely(nbytes != 0)) {
67 unsigned int quadlen = XDR_QUADLEN(nbytes);
68 unsigned int padding = (quadlen << 2) - nbytes;
69
70 if (ptr != NULL)
71 memcpy(p, ptr, nbytes);
72 if (padding != 0)
73 memset((char *)p + nbytes, 0, padding);
74 p += quadlen;
75 }
76 return p;
77}
78EXPORT_SYMBOL_GPL(xdr_encode_opaque_fixed);
79
80
81
82
83
84
85
86
87
88__be32 *xdr_encode_opaque(__be32 *p, const void *ptr, unsigned int nbytes)
89{
90 *p++ = cpu_to_be32(nbytes);
91 return xdr_encode_opaque_fixed(p, ptr, nbytes);
92}
93EXPORT_SYMBOL_GPL(xdr_encode_opaque);
94
95__be32 *
96xdr_encode_string(__be32 *p, const char *string)
97{
98 return xdr_encode_array(p, string, strlen(string));
99}
100EXPORT_SYMBOL_GPL(xdr_encode_string);
101
102__be32 *
103xdr_decode_string_inplace(__be32 *p, char **sp,
104 unsigned int *lenp, unsigned int maxlen)
105{
106 u32 len;
107
108 len = be32_to_cpu(*p++);
109 if (len > maxlen)
110 return NULL;
111 *lenp = len;
112 *sp = (char *) p;
113 return p + XDR_QUADLEN(len);
114}
115EXPORT_SYMBOL_GPL(xdr_decode_string_inplace);
116
117
118
119
120
121
122
123void
124xdr_terminate_string(struct xdr_buf *buf, const u32 len)
125{
126 char *kaddr;
127
128 kaddr = kmap_atomic(buf->pages[0]);
129 kaddr[buf->page_base + len] = '\0';
130 kunmap_atomic(kaddr);
131}
132EXPORT_SYMBOL_GPL(xdr_terminate_string);
133
134size_t
135xdr_buf_pagecount(struct xdr_buf *buf)
136{
137 if (!buf->page_len)
138 return 0;
139 return (buf->page_base + buf->page_len + PAGE_SIZE - 1) >> PAGE_SHIFT;
140}
141
142int
143xdr_alloc_bvec(struct xdr_buf *buf, gfp_t gfp)
144{
145 size_t i, n = xdr_buf_pagecount(buf);
146
147 if (n != 0 && buf->bvec == NULL) {
148 buf->bvec = kmalloc_array(n, sizeof(buf->bvec[0]), gfp);
149 if (!buf->bvec)
150 return -ENOMEM;
151 for (i = 0; i < n; i++) {
152 buf->bvec[i].bv_page = buf->pages[i];
153 buf->bvec[i].bv_len = PAGE_SIZE;
154 buf->bvec[i].bv_offset = 0;
155 }
156 }
157 return 0;
158}
159
160void
161xdr_free_bvec(struct xdr_buf *buf)
162{
163 kfree(buf->bvec);
164 buf->bvec = NULL;
165}
166
167
168
169
170
171
172
173
174
175
176void
177xdr_inline_pages(struct xdr_buf *xdr, unsigned int offset,
178 struct page **pages, unsigned int base, unsigned int len)
179{
180 struct kvec *head = xdr->head;
181 struct kvec *tail = xdr->tail;
182 char *buf = (char *)head->iov_base;
183 unsigned int buflen = head->iov_len;
184
185 head->iov_len = offset;
186
187 xdr->pages = pages;
188 xdr->page_base = base;
189 xdr->page_len = len;
190
191 tail->iov_base = buf + offset;
192 tail->iov_len = buflen - offset;
193 if ((xdr->page_len & 3) == 0)
194 tail->iov_len -= sizeof(__be32);
195
196 xdr->buflen += len;
197}
198EXPORT_SYMBOL_GPL(xdr_inline_pages);
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218static void
219_shift_data_right_pages(struct page **pages, size_t pgto_base,
220 size_t pgfrom_base, size_t len)
221{
222 struct page **pgfrom, **pgto;
223 char *vfrom, *vto;
224 size_t copy;
225
226 BUG_ON(pgto_base <= pgfrom_base);
227
228 pgto_base += len;
229 pgfrom_base += len;
230
231 pgto = pages + (pgto_base >> PAGE_SHIFT);
232 pgfrom = pages + (pgfrom_base >> PAGE_SHIFT);
233
234 pgto_base &= ~PAGE_MASK;
235 pgfrom_base &= ~PAGE_MASK;
236
237 do {
238
239 if (pgto_base == 0) {
240 pgto_base = PAGE_SIZE;
241 pgto--;
242 }
243 if (pgfrom_base == 0) {
244 pgfrom_base = PAGE_SIZE;
245 pgfrom--;
246 }
247
248 copy = len;
249 if (copy > pgto_base)
250 copy = pgto_base;
251 if (copy > pgfrom_base)
252 copy = pgfrom_base;
253 pgto_base -= copy;
254 pgfrom_base -= copy;
255
256 vto = kmap_atomic(*pgto);
257 if (*pgto != *pgfrom) {
258 vfrom = kmap_atomic(*pgfrom);
259 memcpy(vto + pgto_base, vfrom + pgfrom_base, copy);
260 kunmap_atomic(vfrom);
261 } else
262 memmove(vto + pgto_base, vto + pgfrom_base, copy);
263 flush_dcache_page(*pgto);
264 kunmap_atomic(vto);
265
266 } while ((len -= copy) != 0);
267}
268
269
270
271
272
273
274
275
276
277
278
279static void
280_copy_to_pages(struct page **pages, size_t pgbase, const char *p, size_t len)
281{
282 struct page **pgto;
283 char *vto;
284 size_t copy;
285
286 pgto = pages + (pgbase >> PAGE_SHIFT);
287 pgbase &= ~PAGE_MASK;
288
289 for (;;) {
290 copy = PAGE_SIZE - pgbase;
291 if (copy > len)
292 copy = len;
293
294 vto = kmap_atomic(*pgto);
295 memcpy(vto + pgbase, p, copy);
296 kunmap_atomic(vto);
297
298 len -= copy;
299 if (len == 0)
300 break;
301
302 pgbase += copy;
303 if (pgbase == PAGE_SIZE) {
304 flush_dcache_page(*pgto);
305 pgbase = 0;
306 pgto++;
307 }
308 p += copy;
309 }
310 flush_dcache_page(*pgto);
311}
312
313
314
315
316
317
318
319
320
321
322
323void
324_copy_from_pages(char *p, struct page **pages, size_t pgbase, size_t len)
325{
326 struct page **pgfrom;
327 char *vfrom;
328 size_t copy;
329
330 pgfrom = pages + (pgbase >> PAGE_SHIFT);
331 pgbase &= ~PAGE_MASK;
332
333 do {
334 copy = PAGE_SIZE - pgbase;
335 if (copy > len)
336 copy = len;
337
338 vfrom = kmap_atomic(*pgfrom);
339 memcpy(p, vfrom + pgbase, copy);
340 kunmap_atomic(vfrom);
341
342 pgbase += copy;
343 if (pgbase == PAGE_SIZE) {
344 pgbase = 0;
345 pgfrom++;
346 }
347 p += copy;
348
349 } while ((len -= copy) != 0);
350}
351EXPORT_SYMBOL_GPL(_copy_from_pages);
352
353
354
355
356
357
358
359
360
361
362static unsigned int
363xdr_shrink_bufhead(struct xdr_buf *buf, size_t len)
364{
365 struct kvec *head, *tail;
366 size_t copy, offs;
367 unsigned int pglen = buf->page_len;
368 unsigned int result;
369
370 result = 0;
371 tail = buf->tail;
372 head = buf->head;
373
374 WARN_ON_ONCE(len > head->iov_len);
375 if (len > head->iov_len)
376 len = head->iov_len;
377
378
379 if (tail->iov_len != 0) {
380 if (tail->iov_len > len) {
381 copy = tail->iov_len - len;
382 memmove((char *)tail->iov_base + len,
383 tail->iov_base, copy);
384 result += copy;
385 }
386
387 copy = len;
388 if (copy > pglen)
389 copy = pglen;
390 offs = len - copy;
391 if (offs >= tail->iov_len)
392 copy = 0;
393 else if (copy > tail->iov_len - offs)
394 copy = tail->iov_len - offs;
395 if (copy != 0) {
396 _copy_from_pages((char *)tail->iov_base + offs,
397 buf->pages,
398 buf->page_base + pglen + offs - len,
399 copy);
400 result += copy;
401 }
402
403 if (len > pglen) {
404 offs = copy = len - pglen;
405 if (copy > tail->iov_len)
406 copy = tail->iov_len;
407 memcpy(tail->iov_base,
408 (char *)head->iov_base +
409 head->iov_len - offs,
410 copy);
411 result += copy;
412 }
413 }
414
415 if (pglen != 0) {
416 if (pglen > len)
417 _shift_data_right_pages(buf->pages,
418 buf->page_base + len,
419 buf->page_base,
420 pglen - len);
421 copy = len;
422 if (len > pglen)
423 copy = pglen;
424 _copy_to_pages(buf->pages, buf->page_base,
425 (char *)head->iov_base + head->iov_len - len,
426 copy);
427 result += copy;
428 }
429 head->iov_len -= len;
430 buf->buflen -= len;
431
432 if (buf->len > buf->buflen)
433 buf->len = buf->buflen;
434
435 return result;
436}
437
438
439
440
441
442
443
444
445
446static unsigned int
447xdr_shrink_pagelen(struct xdr_buf *buf, size_t len)
448{
449 struct kvec *tail;
450 size_t copy;
451 unsigned int pglen = buf->page_len;
452 unsigned int tailbuf_len;
453 unsigned int result;
454
455 result = 0;
456 tail = buf->tail;
457 if (len > buf->page_len)
458 len = buf-> page_len;
459 tailbuf_len = buf->buflen - buf->head->iov_len - buf->page_len;
460
461
462 if (tailbuf_len != 0) {
463 unsigned int free_space = tailbuf_len - tail->iov_len;
464
465 if (len < free_space)
466 free_space = len;
467 tail->iov_len += free_space;
468
469 copy = len;
470 if (tail->iov_len > len) {
471 char *p = (char *)tail->iov_base + len;
472 memmove(p, tail->iov_base, tail->iov_len - len);
473 result += tail->iov_len - len;
474 } else
475 copy = tail->iov_len;
476
477 _copy_from_pages((char *)tail->iov_base,
478 buf->pages, buf->page_base + pglen - len,
479 copy);
480 result += copy;
481 }
482 buf->page_len -= len;
483 buf->buflen -= len;
484
485 if (buf->len > buf->buflen)
486 buf->len = buf->buflen;
487
488 return result;
489}
490
491void
492xdr_shift_buf(struct xdr_buf *buf, size_t len)
493{
494 xdr_shrink_bufhead(buf, len);
495}
496EXPORT_SYMBOL_GPL(xdr_shift_buf);
497
498
499
500
501
502unsigned int xdr_stream_pos(const struct xdr_stream *xdr)
503{
504 return (unsigned int)(XDR_QUADLEN(xdr->buf->len) - xdr->nwords) << 2;
505}
506EXPORT_SYMBOL_GPL(xdr_stream_pos);
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522void xdr_init_encode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p,
523 struct rpc_rqst *rqst)
524{
525 struct kvec *iov = buf->head;
526 int scratch_len = buf->buflen - buf->page_len - buf->tail[0].iov_len;
527
528 xdr_set_scratch_buffer(xdr, NULL, 0);
529 BUG_ON(scratch_len < 0);
530 xdr->buf = buf;
531 xdr->iov = iov;
532 xdr->p = (__be32 *)((char *)iov->iov_base + iov->iov_len);
533 xdr->end = (__be32 *)((char *)iov->iov_base + scratch_len);
534 BUG_ON(iov->iov_len > scratch_len);
535
536 if (p != xdr->p && p != NULL) {
537 size_t len;
538
539 BUG_ON(p < xdr->p || p > xdr->end);
540 len = (char *)p - (char *)xdr->p;
541 xdr->p = p;
542 buf->len += len;
543 iov->iov_len += len;
544 }
545 xdr->rqst = rqst;
546}
547EXPORT_SYMBOL_GPL(xdr_init_encode);
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562inline void xdr_commit_encode(struct xdr_stream *xdr)
563{
564 int shift = xdr->scratch.iov_len;
565 void *page;
566
567 if (shift == 0)
568 return;
569 page = page_address(*xdr->page_ptr);
570 memcpy(xdr->scratch.iov_base, page, shift);
571 memmove(page, page + shift, (void *)xdr->p - page);
572 xdr->scratch.iov_len = 0;
573}
574EXPORT_SYMBOL_GPL(xdr_commit_encode);
575
576static __be32 *xdr_get_next_encode_buffer(struct xdr_stream *xdr,
577 size_t nbytes)
578{
579 __be32 *p;
580 int space_left;
581 int frag1bytes, frag2bytes;
582
583 if (nbytes > PAGE_SIZE)
584 goto out_overflow;
585 if (xdr->buf->len + nbytes > xdr->buf->buflen)
586 goto out_overflow;
587 frag1bytes = (xdr->end - xdr->p) << 2;
588 frag2bytes = nbytes - frag1bytes;
589 if (xdr->iov)
590 xdr->iov->iov_len += frag1bytes;
591 else
592 xdr->buf->page_len += frag1bytes;
593 xdr->page_ptr++;
594 xdr->iov = NULL;
595
596
597
598
599
600
601
602 xdr->scratch.iov_base = xdr->p;
603 xdr->scratch.iov_len = frag1bytes;
604 p = page_address(*xdr->page_ptr);
605
606
607
608
609 xdr->p = (void *)p + frag2bytes;
610 space_left = xdr->buf->buflen - xdr->buf->len;
611 xdr->end = (void *)p + min_t(int, space_left, PAGE_SIZE);
612 xdr->buf->page_len += frag2bytes;
613 xdr->buf->len += nbytes;
614 return p;
615out_overflow:
616 trace_rpc_xdr_overflow(xdr, nbytes);
617 return NULL;
618}
619
620
621
622
623
624
625
626
627
628
629__be32 * xdr_reserve_space(struct xdr_stream *xdr, size_t nbytes)
630{
631 __be32 *p = xdr->p;
632 __be32 *q;
633
634 xdr_commit_encode(xdr);
635
636 nbytes += 3;
637 nbytes &= ~3;
638 q = p + (nbytes >> 2);
639 if (unlikely(q > xdr->end || q < p))
640 return xdr_get_next_encode_buffer(xdr, nbytes);
641 xdr->p = q;
642 if (xdr->iov)
643 xdr->iov->iov_len += nbytes;
644 else
645 xdr->buf->page_len += nbytes;
646 xdr->buf->len += nbytes;
647 return p;
648}
649EXPORT_SYMBOL_GPL(xdr_reserve_space);
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670void xdr_truncate_encode(struct xdr_stream *xdr, size_t len)
671{
672 struct xdr_buf *buf = xdr->buf;
673 struct kvec *head = buf->head;
674 struct kvec *tail = buf->tail;
675 int fraglen;
676 int new;
677
678 if (len > buf->len) {
679 WARN_ON_ONCE(1);
680 return;
681 }
682 xdr_commit_encode(xdr);
683
684 fraglen = min_t(int, buf->len - len, tail->iov_len);
685 tail->iov_len -= fraglen;
686 buf->len -= fraglen;
687 if (tail->iov_len) {
688 xdr->p = tail->iov_base + tail->iov_len;
689 WARN_ON_ONCE(!xdr->end);
690 WARN_ON_ONCE(!xdr->iov);
691 return;
692 }
693 WARN_ON_ONCE(fraglen);
694 fraglen = min_t(int, buf->len - len, buf->page_len);
695 buf->page_len -= fraglen;
696 buf->len -= fraglen;
697
698 new = buf->page_base + buf->page_len;
699
700 xdr->page_ptr = buf->pages + (new >> PAGE_SHIFT);
701
702 if (buf->page_len) {
703 xdr->p = page_address(*xdr->page_ptr);
704 xdr->end = (void *)xdr->p + PAGE_SIZE;
705 xdr->p = (void *)xdr->p + (new % PAGE_SIZE);
706 WARN_ON_ONCE(xdr->iov);
707 return;
708 }
709 if (fraglen)
710 xdr->end = head->iov_base + head->iov_len;
711
712 xdr->page_ptr--;
713 head->iov_len = len;
714 buf->len = len;
715 xdr->p = head->iov_base + head->iov_len;
716 xdr->iov = buf->head;
717}
718EXPORT_SYMBOL(xdr_truncate_encode);
719
720
721
722
723
724
725
726
727
728
729
730
731
732int xdr_restrict_buflen(struct xdr_stream *xdr, int newbuflen)
733{
734 struct xdr_buf *buf = xdr->buf;
735 int left_in_this_buf = (void *)xdr->end - (void *)xdr->p;
736 int end_offset = buf->len + left_in_this_buf;
737
738 if (newbuflen < 0 || newbuflen < buf->len)
739 return -1;
740 if (newbuflen > buf->buflen)
741 return 0;
742 if (newbuflen < end_offset)
743 xdr->end = (void *)xdr->end + newbuflen - end_offset;
744 buf->buflen = newbuflen;
745 return 0;
746}
747EXPORT_SYMBOL(xdr_restrict_buflen);
748
749
750
751
752
753
754
755
756
757void xdr_write_pages(struct xdr_stream *xdr, struct page **pages, unsigned int base,
758 unsigned int len)
759{
760 struct xdr_buf *buf = xdr->buf;
761 struct kvec *iov = buf->tail;
762 buf->pages = pages;
763 buf->page_base = base;
764 buf->page_len = len;
765
766 iov->iov_base = (char *)xdr->p;
767 iov->iov_len = 0;
768 xdr->iov = iov;
769
770 if (len & 3) {
771 unsigned int pad = 4 - (len & 3);
772
773 BUG_ON(xdr->p >= xdr->end);
774 iov->iov_base = (char *)xdr->p + (len & 3);
775 iov->iov_len += pad;
776 len += pad;
777 *xdr->p++ = 0;
778 }
779 buf->buflen += len;
780 buf->len += len;
781}
782EXPORT_SYMBOL_GPL(xdr_write_pages);
783
784static void xdr_set_iov(struct xdr_stream *xdr, struct kvec *iov,
785 unsigned int len)
786{
787 if (len > iov->iov_len)
788 len = iov->iov_len;
789 xdr->p = (__be32*)iov->iov_base;
790 xdr->end = (__be32*)(iov->iov_base + len);
791 xdr->iov = iov;
792 xdr->page_ptr = NULL;
793}
794
795static int xdr_set_page_base(struct xdr_stream *xdr,
796 unsigned int base, unsigned int len)
797{
798 unsigned int pgnr;
799 unsigned int maxlen;
800 unsigned int pgoff;
801 unsigned int pgend;
802 void *kaddr;
803
804 maxlen = xdr->buf->page_len;
805 if (base >= maxlen)
806 return -EINVAL;
807 maxlen -= base;
808 if (len > maxlen)
809 len = maxlen;
810
811 base += xdr->buf->page_base;
812
813 pgnr = base >> PAGE_SHIFT;
814 xdr->page_ptr = &xdr->buf->pages[pgnr];
815 kaddr = page_address(*xdr->page_ptr);
816
817 pgoff = base & ~PAGE_MASK;
818 xdr->p = (__be32*)(kaddr + pgoff);
819
820 pgend = pgoff + len;
821 if (pgend > PAGE_SIZE)
822 pgend = PAGE_SIZE;
823 xdr->end = (__be32*)(kaddr + pgend);
824 xdr->iov = NULL;
825 return 0;
826}
827
828static void xdr_set_next_page(struct xdr_stream *xdr)
829{
830 unsigned int newbase;
831
832 newbase = (1 + xdr->page_ptr - xdr->buf->pages) << PAGE_SHIFT;
833 newbase -= xdr->buf->page_base;
834
835 if (xdr_set_page_base(xdr, newbase, PAGE_SIZE) < 0)
836 xdr_set_iov(xdr, xdr->buf->tail, xdr->nwords << 2);
837}
838
839static bool xdr_set_next_buffer(struct xdr_stream *xdr)
840{
841 if (xdr->page_ptr != NULL)
842 xdr_set_next_page(xdr);
843 else if (xdr->iov == xdr->buf->head) {
844 if (xdr_set_page_base(xdr, 0, PAGE_SIZE) < 0)
845 xdr_set_iov(xdr, xdr->buf->tail, xdr->nwords << 2);
846 }
847 return xdr->p != xdr->end;
848}
849
850
851
852
853
854
855
856
857void xdr_init_decode(struct xdr_stream *xdr, struct xdr_buf *buf, __be32 *p,
858 struct rpc_rqst *rqst)
859{
860 xdr->buf = buf;
861 xdr->scratch.iov_base = NULL;
862 xdr->scratch.iov_len = 0;
863 xdr->nwords = XDR_QUADLEN(buf->len);
864 if (buf->head[0].iov_len != 0)
865 xdr_set_iov(xdr, buf->head, buf->len);
866 else if (buf->page_len != 0)
867 xdr_set_page_base(xdr, 0, buf->len);
868 else
869 xdr_set_iov(xdr, buf->head, buf->len);
870 if (p != NULL && p > xdr->p && xdr->end >= p) {
871 xdr->nwords -= p - xdr->p;
872 xdr->p = p;
873 }
874 xdr->rqst = rqst;
875}
876EXPORT_SYMBOL_GPL(xdr_init_decode);
877
878
879
880
881
882
883
884
885void xdr_init_decode_pages(struct xdr_stream *xdr, struct xdr_buf *buf,
886 struct page **pages, unsigned int len)
887{
888 memset(buf, 0, sizeof(*buf));
889 buf->pages = pages;
890 buf->page_len = len;
891 buf->buflen = len;
892 buf->len = len;
893 xdr_init_decode(xdr, buf, NULL, NULL);
894}
895EXPORT_SYMBOL_GPL(xdr_init_decode_pages);
896
897static __be32 * __xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes)
898{
899 unsigned int nwords = XDR_QUADLEN(nbytes);
900 __be32 *p = xdr->p;
901 __be32 *q = p + nwords;
902
903 if (unlikely(nwords > xdr->nwords || q > xdr->end || q < p))
904 return NULL;
905 xdr->p = q;
906 xdr->nwords -= nwords;
907 return p;
908}
909
910
911
912
913
914
915
916
917
918
919
920
921void xdr_set_scratch_buffer(struct xdr_stream *xdr, void *buf, size_t buflen)
922{
923 xdr->scratch.iov_base = buf;
924 xdr->scratch.iov_len = buflen;
925}
926EXPORT_SYMBOL_GPL(xdr_set_scratch_buffer);
927
928static __be32 *xdr_copy_to_scratch(struct xdr_stream *xdr, size_t nbytes)
929{
930 __be32 *p;
931 char *cpdest = xdr->scratch.iov_base;
932 size_t cplen = (char *)xdr->end - (char *)xdr->p;
933
934 if (nbytes > xdr->scratch.iov_len)
935 goto out_overflow;
936 p = __xdr_inline_decode(xdr, cplen);
937 if (p == NULL)
938 return NULL;
939 memcpy(cpdest, p, cplen);
940 if (!xdr_set_next_buffer(xdr))
941 goto out_overflow;
942 cpdest += cplen;
943 nbytes -= cplen;
944 p = __xdr_inline_decode(xdr, nbytes);
945 if (p == NULL)
946 return NULL;
947 memcpy(cpdest, p, nbytes);
948 return xdr->scratch.iov_base;
949out_overflow:
950 trace_rpc_xdr_overflow(xdr, nbytes);
951 return NULL;
952}
953
954
955
956
957
958
959
960
961
962
963
964__be32 * xdr_inline_decode(struct xdr_stream *xdr, size_t nbytes)
965{
966 __be32 *p;
967
968 if (unlikely(nbytes == 0))
969 return xdr->p;
970 if (xdr->p == xdr->end && !xdr_set_next_buffer(xdr))
971 goto out_overflow;
972 p = __xdr_inline_decode(xdr, nbytes);
973 if (p != NULL)
974 return p;
975 return xdr_copy_to_scratch(xdr, nbytes);
976out_overflow:
977 trace_rpc_xdr_overflow(xdr, nbytes);
978 return NULL;
979}
980EXPORT_SYMBOL_GPL(xdr_inline_decode);
981
982static unsigned int xdr_align_pages(struct xdr_stream *xdr, unsigned int len)
983{
984 struct xdr_buf *buf = xdr->buf;
985 struct kvec *iov;
986 unsigned int nwords = XDR_QUADLEN(len);
987 unsigned int cur = xdr_stream_pos(xdr);
988 unsigned int copied, offset;
989
990 if (xdr->nwords == 0)
991 return 0;
992
993
994 iov = buf->head;
995 if (iov->iov_len > cur) {
996 offset = iov->iov_len - cur;
997 copied = xdr_shrink_bufhead(buf, offset);
998 trace_rpc_xdr_alignment(xdr, offset, copied);
999 xdr->nwords = XDR_QUADLEN(buf->len - cur);
1000 }
1001
1002 if (nwords > xdr->nwords) {
1003 nwords = xdr->nwords;
1004 len = nwords << 2;
1005 }
1006 if (buf->page_len <= len)
1007 len = buf->page_len;
1008 else if (nwords < xdr->nwords) {
1009
1010 offset = buf->page_len - len;
1011 copied = xdr_shrink_pagelen(buf, offset);
1012 trace_rpc_xdr_alignment(xdr, offset, copied);
1013 xdr->nwords = XDR_QUADLEN(buf->len - cur);
1014 }
1015 return len;
1016}
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029unsigned int xdr_read_pages(struct xdr_stream *xdr, unsigned int len)
1030{
1031 struct xdr_buf *buf = xdr->buf;
1032 struct kvec *iov;
1033 unsigned int nwords;
1034 unsigned int end;
1035 unsigned int padding;
1036
1037 len = xdr_align_pages(xdr, len);
1038 if (len == 0)
1039 return 0;
1040 nwords = XDR_QUADLEN(len);
1041 padding = (nwords << 2) - len;
1042 xdr->iov = iov = buf->tail;
1043
1044 end = ((xdr->nwords - nwords) << 2) + padding;
1045 if (end > iov->iov_len)
1046 end = iov->iov_len;
1047
1048
1049
1050
1051
1052 xdr->p = (__be32 *)((char *)iov->iov_base + padding);
1053 xdr->end = (__be32 *)((char *)iov->iov_base + end);
1054 xdr->page_ptr = NULL;
1055 xdr->nwords = XDR_QUADLEN(end - padding);
1056 return len;
1057}
1058EXPORT_SYMBOL_GPL(xdr_read_pages);
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070void xdr_enter_page(struct xdr_stream *xdr, unsigned int len)
1071{
1072 len = xdr_align_pages(xdr, len);
1073
1074
1075
1076
1077 if (len != 0)
1078 xdr_set_page_base(xdr, 0, len);
1079}
1080EXPORT_SYMBOL_GPL(xdr_enter_page);
1081
1082static const struct kvec empty_iov = {.iov_base = NULL, .iov_len = 0};
1083
1084void
1085xdr_buf_from_iov(struct kvec *iov, struct xdr_buf *buf)
1086{
1087 buf->head[0] = *iov;
1088 buf->tail[0] = empty_iov;
1089 buf->page_len = 0;
1090 buf->buflen = buf->len = iov->iov_len;
1091}
1092EXPORT_SYMBOL_GPL(xdr_buf_from_iov);
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108int
1109xdr_buf_subsegment(struct xdr_buf *buf, struct xdr_buf *subbuf,
1110 unsigned int base, unsigned int len)
1111{
1112 subbuf->buflen = subbuf->len = len;
1113 if (base < buf->head[0].iov_len) {
1114 subbuf->head[0].iov_base = buf->head[0].iov_base + base;
1115 subbuf->head[0].iov_len = min_t(unsigned int, len,
1116 buf->head[0].iov_len - base);
1117 len -= subbuf->head[0].iov_len;
1118 base = 0;
1119 } else {
1120 base -= buf->head[0].iov_len;
1121 subbuf->head[0].iov_base = buf->head[0].iov_base;
1122 subbuf->head[0].iov_len = 0;
1123 }
1124
1125 if (base < buf->page_len) {
1126 subbuf->page_len = min(buf->page_len - base, len);
1127 base += buf->page_base;
1128 subbuf->page_base = base & ~PAGE_MASK;
1129 subbuf->pages = &buf->pages[base >> PAGE_SHIFT];
1130 len -= subbuf->page_len;
1131 base = 0;
1132 } else {
1133 base -= buf->page_len;
1134 subbuf->pages = buf->pages;
1135 subbuf->page_base = 0;
1136 subbuf->page_len = 0;
1137 }
1138
1139 if (base < buf->tail[0].iov_len) {
1140 subbuf->tail[0].iov_base = buf->tail[0].iov_base + base;
1141 subbuf->tail[0].iov_len = min_t(unsigned int, len,
1142 buf->tail[0].iov_len - base);
1143 len -= subbuf->tail[0].iov_len;
1144 base = 0;
1145 } else {
1146 base -= buf->tail[0].iov_len;
1147 subbuf->tail[0].iov_base = buf->tail[0].iov_base;
1148 subbuf->tail[0].iov_len = 0;
1149 }
1150
1151 if (base || len)
1152 return -1;
1153 return 0;
1154}
1155EXPORT_SYMBOL_GPL(xdr_buf_subsegment);
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167void xdr_buf_trim(struct xdr_buf *buf, unsigned int len)
1168{
1169 size_t cur;
1170 unsigned int trim = len;
1171
1172 if (buf->tail[0].iov_len) {
1173 cur = min_t(size_t, buf->tail[0].iov_len, trim);
1174 buf->tail[0].iov_len -= cur;
1175 trim -= cur;
1176 if (!trim)
1177 goto fix_len;
1178 }
1179
1180 if (buf->page_len) {
1181 cur = min_t(unsigned int, buf->page_len, trim);
1182 buf->page_len -= cur;
1183 trim -= cur;
1184 if (!trim)
1185 goto fix_len;
1186 }
1187
1188 if (buf->head[0].iov_len) {
1189 cur = min_t(size_t, buf->head[0].iov_len, trim);
1190 buf->head[0].iov_len -= cur;
1191 trim -= cur;
1192 }
1193fix_len:
1194 buf->len -= (len - trim);
1195}
1196EXPORT_SYMBOL_GPL(xdr_buf_trim);
1197
1198static void __read_bytes_from_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len)
1199{
1200 unsigned int this_len;
1201
1202 this_len = min_t(unsigned int, len, subbuf->head[0].iov_len);
1203 memcpy(obj, subbuf->head[0].iov_base, this_len);
1204 len -= this_len;
1205 obj += this_len;
1206 this_len = min_t(unsigned int, len, subbuf->page_len);
1207 if (this_len)
1208 _copy_from_pages(obj, subbuf->pages, subbuf->page_base, this_len);
1209 len -= this_len;
1210 obj += this_len;
1211 this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len);
1212 memcpy(obj, subbuf->tail[0].iov_base, this_len);
1213}
1214
1215
1216int read_bytes_from_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len)
1217{
1218 struct xdr_buf subbuf;
1219 int status;
1220
1221 status = xdr_buf_subsegment(buf, &subbuf, base, len);
1222 if (status != 0)
1223 return status;
1224 __read_bytes_from_xdr_buf(&subbuf, obj, len);
1225 return 0;
1226}
1227EXPORT_SYMBOL_GPL(read_bytes_from_xdr_buf);
1228
1229static void __write_bytes_to_xdr_buf(struct xdr_buf *subbuf, void *obj, unsigned int len)
1230{
1231 unsigned int this_len;
1232
1233 this_len = min_t(unsigned int, len, subbuf->head[0].iov_len);
1234 memcpy(subbuf->head[0].iov_base, obj, this_len);
1235 len -= this_len;
1236 obj += this_len;
1237 this_len = min_t(unsigned int, len, subbuf->page_len);
1238 if (this_len)
1239 _copy_to_pages(subbuf->pages, subbuf->page_base, obj, this_len);
1240 len -= this_len;
1241 obj += this_len;
1242 this_len = min_t(unsigned int, len, subbuf->tail[0].iov_len);
1243 memcpy(subbuf->tail[0].iov_base, obj, this_len);
1244}
1245
1246
1247int write_bytes_to_xdr_buf(struct xdr_buf *buf, unsigned int base, void *obj, unsigned int len)
1248{
1249 struct xdr_buf subbuf;
1250 int status;
1251
1252 status = xdr_buf_subsegment(buf, &subbuf, base, len);
1253 if (status != 0)
1254 return status;
1255 __write_bytes_to_xdr_buf(&subbuf, obj, len);
1256 return 0;
1257}
1258EXPORT_SYMBOL_GPL(write_bytes_to_xdr_buf);
1259
1260int
1261xdr_decode_word(struct xdr_buf *buf, unsigned int base, u32 *obj)
1262{
1263 __be32 raw;
1264 int status;
1265
1266 status = read_bytes_from_xdr_buf(buf, base, &raw, sizeof(*obj));
1267 if (status)
1268 return status;
1269 *obj = be32_to_cpu(raw);
1270 return 0;
1271}
1272EXPORT_SYMBOL_GPL(xdr_decode_word);
1273
1274int
1275xdr_encode_word(struct xdr_buf *buf, unsigned int base, u32 obj)
1276{
1277 __be32 raw = cpu_to_be32(obj);
1278
1279 return write_bytes_to_xdr_buf(buf, base, &raw, sizeof(obj));
1280}
1281EXPORT_SYMBOL_GPL(xdr_encode_word);
1282
1283
1284static int
1285xdr_xcode_array2(struct xdr_buf *buf, unsigned int base,
1286 struct xdr_array2_desc *desc, int encode)
1287{
1288 char *elem = NULL, *c;
1289 unsigned int copied = 0, todo, avail_here;
1290 struct page **ppages = NULL;
1291 int err;
1292
1293 if (encode) {
1294 if (xdr_encode_word(buf, base, desc->array_len) != 0)
1295 return -EINVAL;
1296 } else {
1297 if (xdr_decode_word(buf, base, &desc->array_len) != 0 ||
1298 desc->array_len > desc->array_maxlen ||
1299 (unsigned long) base + 4 + desc->array_len *
1300 desc->elem_size > buf->len)
1301 return -EINVAL;
1302 }
1303 base += 4;
1304
1305 if (!desc->xcode)
1306 return 0;
1307
1308 todo = desc->array_len * desc->elem_size;
1309
1310
1311 if (todo && base < buf->head->iov_len) {
1312 c = buf->head->iov_base + base;
1313 avail_here = min_t(unsigned int, todo,
1314 buf->head->iov_len - base);
1315 todo -= avail_here;
1316
1317 while (avail_here >= desc->elem_size) {
1318 err = desc->xcode(desc, c);
1319 if (err)
1320 goto out;
1321 c += desc->elem_size;
1322 avail_here -= desc->elem_size;
1323 }
1324 if (avail_here) {
1325 if (!elem) {
1326 elem = kmalloc(desc->elem_size, GFP_KERNEL);
1327 err = -ENOMEM;
1328 if (!elem)
1329 goto out;
1330 }
1331 if (encode) {
1332 err = desc->xcode(desc, elem);
1333 if (err)
1334 goto out;
1335 memcpy(c, elem, avail_here);
1336 } else
1337 memcpy(elem, c, avail_here);
1338 copied = avail_here;
1339 }
1340 base = buf->head->iov_len;
1341 }
1342
1343
1344 base -= buf->head->iov_len;
1345 if (todo && base < buf->page_len) {
1346 unsigned int avail_page;
1347
1348 avail_here = min(todo, buf->page_len - base);
1349 todo -= avail_here;
1350
1351 base += buf->page_base;
1352 ppages = buf->pages + (base >> PAGE_SHIFT);
1353 base &= ~PAGE_MASK;
1354 avail_page = min_t(unsigned int, PAGE_SIZE - base,
1355 avail_here);
1356 c = kmap(*ppages) + base;
1357
1358 while (avail_here) {
1359 avail_here -= avail_page;
1360 if (copied || avail_page < desc->elem_size) {
1361 unsigned int l = min(avail_page,
1362 desc->elem_size - copied);
1363 if (!elem) {
1364 elem = kmalloc(desc->elem_size,
1365 GFP_KERNEL);
1366 err = -ENOMEM;
1367 if (!elem)
1368 goto out;
1369 }
1370 if (encode) {
1371 if (!copied) {
1372 err = desc->xcode(desc, elem);
1373 if (err)
1374 goto out;
1375 }
1376 memcpy(c, elem + copied, l);
1377 copied += l;
1378 if (copied == desc->elem_size)
1379 copied = 0;
1380 } else {
1381 memcpy(elem + copied, c, l);
1382 copied += l;
1383 if (copied == desc->elem_size) {
1384 err = desc->xcode(desc, elem);
1385 if (err)
1386 goto out;
1387 copied = 0;
1388 }
1389 }
1390 avail_page -= l;
1391 c += l;
1392 }
1393 while (avail_page >= desc->elem_size) {
1394 err = desc->xcode(desc, c);
1395 if (err)
1396 goto out;
1397 c += desc->elem_size;
1398 avail_page -= desc->elem_size;
1399 }
1400 if (avail_page) {
1401 unsigned int l = min(avail_page,
1402 desc->elem_size - copied);
1403 if (!elem) {
1404 elem = kmalloc(desc->elem_size,
1405 GFP_KERNEL);
1406 err = -ENOMEM;
1407 if (!elem)
1408 goto out;
1409 }
1410 if (encode) {
1411 if (!copied) {
1412 err = desc->xcode(desc, elem);
1413 if (err)
1414 goto out;
1415 }
1416 memcpy(c, elem + copied, l);
1417 copied += l;
1418 if (copied == desc->elem_size)
1419 copied = 0;
1420 } else {
1421 memcpy(elem + copied, c, l);
1422 copied += l;
1423 if (copied == desc->elem_size) {
1424 err = desc->xcode(desc, elem);
1425 if (err)
1426 goto out;
1427 copied = 0;
1428 }
1429 }
1430 }
1431 if (avail_here) {
1432 kunmap(*ppages);
1433 ppages++;
1434 c = kmap(*ppages);
1435 }
1436
1437 avail_page = min(avail_here,
1438 (unsigned int) PAGE_SIZE);
1439 }
1440 base = buf->page_len;
1441 }
1442
1443
1444 base -= buf->page_len;
1445 if (todo) {
1446 c = buf->tail->iov_base + base;
1447 if (copied) {
1448 unsigned int l = desc->elem_size - copied;
1449
1450 if (encode)
1451 memcpy(c, elem + copied, l);
1452 else {
1453 memcpy(elem + copied, c, l);
1454 err = desc->xcode(desc, elem);
1455 if (err)
1456 goto out;
1457 }
1458 todo -= l;
1459 c += l;
1460 }
1461 while (todo) {
1462 err = desc->xcode(desc, c);
1463 if (err)
1464 goto out;
1465 c += desc->elem_size;
1466 todo -= desc->elem_size;
1467 }
1468 }
1469 err = 0;
1470
1471out:
1472 kfree(elem);
1473 if (ppages)
1474 kunmap(*ppages);
1475 return err;
1476}
1477
1478int
1479xdr_decode_array2(struct xdr_buf *buf, unsigned int base,
1480 struct xdr_array2_desc *desc)
1481{
1482 if (base >= buf->len)
1483 return -EINVAL;
1484
1485 return xdr_xcode_array2(buf, base, desc, 0);
1486}
1487EXPORT_SYMBOL_GPL(xdr_decode_array2);
1488
1489int
1490xdr_encode_array2(struct xdr_buf *buf, unsigned int base,
1491 struct xdr_array2_desc *desc)
1492{
1493 if ((unsigned long) base + 4 + desc->array_len * desc->elem_size >
1494 buf->head->iov_len + buf->page_len + buf->tail->iov_len)
1495 return -EINVAL;
1496
1497 return xdr_xcode_array2(buf, base, desc, 1);
1498}
1499EXPORT_SYMBOL_GPL(xdr_encode_array2);
1500
1501int
1502xdr_process_buf(struct xdr_buf *buf, unsigned int offset, unsigned int len,
1503 int (*actor)(struct scatterlist *, void *), void *data)
1504{
1505 int i, ret = 0;
1506 unsigned int page_len, thislen, page_offset;
1507 struct scatterlist sg[1];
1508
1509 sg_init_table(sg, 1);
1510
1511 if (offset >= buf->head[0].iov_len) {
1512 offset -= buf->head[0].iov_len;
1513 } else {
1514 thislen = buf->head[0].iov_len - offset;
1515 if (thislen > len)
1516 thislen = len;
1517 sg_set_buf(sg, buf->head[0].iov_base + offset, thislen);
1518 ret = actor(sg, data);
1519 if (ret)
1520 goto out;
1521 offset = 0;
1522 len -= thislen;
1523 }
1524 if (len == 0)
1525 goto out;
1526
1527 if (offset >= buf->page_len) {
1528 offset -= buf->page_len;
1529 } else {
1530 page_len = buf->page_len - offset;
1531 if (page_len > len)
1532 page_len = len;
1533 len -= page_len;
1534 page_offset = (offset + buf->page_base) & (PAGE_SIZE - 1);
1535 i = (offset + buf->page_base) >> PAGE_SHIFT;
1536 thislen = PAGE_SIZE - page_offset;
1537 do {
1538 if (thislen > page_len)
1539 thislen = page_len;
1540 sg_set_page(sg, buf->pages[i], thislen, page_offset);
1541 ret = actor(sg, data);
1542 if (ret)
1543 goto out;
1544 page_len -= thislen;
1545 i++;
1546 page_offset = 0;
1547 thislen = PAGE_SIZE;
1548 } while (page_len != 0);
1549 offset = 0;
1550 }
1551 if (len == 0)
1552 goto out;
1553 if (offset < buf->tail[0].iov_len) {
1554 thislen = buf->tail[0].iov_len - offset;
1555 if (thislen > len)
1556 thislen = len;
1557 sg_set_buf(sg, buf->tail[0].iov_base + offset, thislen);
1558 ret = actor(sg, data);
1559 len -= thislen;
1560 }
1561 if (len != 0)
1562 ret = -EINVAL;
1563out:
1564 return ret;
1565}
1566EXPORT_SYMBOL_GPL(xdr_process_buf);
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579ssize_t xdr_stream_decode_opaque(struct xdr_stream *xdr, void *ptr, size_t size)
1580{
1581 ssize_t ret;
1582 void *p;
1583
1584 ret = xdr_stream_decode_opaque_inline(xdr, &p, size);
1585 if (ret <= 0)
1586 return ret;
1587 memcpy(ptr, p, ret);
1588 return ret;
1589}
1590EXPORT_SYMBOL_GPL(xdr_stream_decode_opaque);
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605ssize_t xdr_stream_decode_opaque_dup(struct xdr_stream *xdr, void **ptr,
1606 size_t maxlen, gfp_t gfp_flags)
1607{
1608 ssize_t ret;
1609 void *p;
1610
1611 ret = xdr_stream_decode_opaque_inline(xdr, &p, maxlen);
1612 if (ret > 0) {
1613 *ptr = kmemdup(p, ret, gfp_flags);
1614 if (*ptr != NULL)
1615 return ret;
1616 ret = -ENOMEM;
1617 }
1618 *ptr = NULL;
1619 return ret;
1620}
1621EXPORT_SYMBOL_GPL(xdr_stream_decode_opaque_dup);
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634ssize_t xdr_stream_decode_string(struct xdr_stream *xdr, char *str, size_t size)
1635{
1636 ssize_t ret;
1637 void *p;
1638
1639 ret = xdr_stream_decode_opaque_inline(xdr, &p, size);
1640 if (ret > 0) {
1641 memcpy(str, p, ret);
1642 str[ret] = '\0';
1643 return strlen(str);
1644 }
1645 *str = '\0';
1646 return ret;
1647}
1648EXPORT_SYMBOL_GPL(xdr_stream_decode_string);
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663ssize_t xdr_stream_decode_string_dup(struct xdr_stream *xdr, char **str,
1664 size_t maxlen, gfp_t gfp_flags)
1665{
1666 void *p;
1667 ssize_t ret;
1668
1669 ret = xdr_stream_decode_opaque_inline(xdr, &p, maxlen);
1670 if (ret > 0) {
1671 char *s = kmalloc(ret + 1, gfp_flags);
1672 if (s != NULL) {
1673 memcpy(s, p, ret);
1674 s[ret] = '\0';
1675 *str = s;
1676 return strlen(s);
1677 }
1678 ret = -ENOMEM;
1679 }
1680 *str = NULL;
1681 return ret;
1682}
1683EXPORT_SYMBOL_GPL(xdr_stream_decode_string_dup);
1684