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7#include <linux/export.h>
8#include <linux/slab.h>
9#include <linux/scatterlist.h>
10#include <linux/highmem.h>
11#include <linux/kmemleak.h>
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23struct scatterlist *sg_next(struct scatterlist *sg)
24{
25 if (sg_is_last(sg))
26 return NULL;
27
28 sg++;
29 if (unlikely(sg_is_chain(sg)))
30 sg = sg_chain_ptr(sg);
31
32 return sg;
33}
34EXPORT_SYMBOL(sg_next);
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43
44
45int sg_nents(struct scatterlist *sg)
46{
47 int nents;
48 for (nents = 0; sg; sg = sg_next(sg))
49 nents++;
50 return nents;
51}
52EXPORT_SYMBOL(sg_nents);
53
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67
68int sg_nents_for_len(struct scatterlist *sg, u64 len)
69{
70 int nents;
71 u64 total;
72
73 if (!len)
74 return 0;
75
76 for (nents = 0, total = 0; sg; sg = sg_next(sg)) {
77 nents++;
78 total += sg->length;
79 if (total >= len)
80 return nents;
81 }
82
83 return -EINVAL;
84}
85EXPORT_SYMBOL(sg_nents_for_len);
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100
101struct scatterlist *sg_last(struct scatterlist *sgl, unsigned int nents)
102{
103 struct scatterlist *sg, *ret = NULL;
104 unsigned int i;
105
106 for_each_sg(sgl, sg, nents, i)
107 ret = sg;
108
109 BUG_ON(!sg_is_last(ret));
110 return ret;
111}
112EXPORT_SYMBOL(sg_last);
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123
124void sg_init_table(struct scatterlist *sgl, unsigned int nents)
125{
126 memset(sgl, 0, sizeof(*sgl) * nents);
127 sg_init_marker(sgl, nents);
128}
129EXPORT_SYMBOL(sg_init_table);
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138void sg_init_one(struct scatterlist *sg, const void *buf, unsigned int buflen)
139{
140 sg_init_table(sg, 1);
141 sg_set_buf(sg, buf, buflen);
142}
143EXPORT_SYMBOL(sg_init_one);
144
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148
149static struct scatterlist *sg_kmalloc(unsigned int nents, gfp_t gfp_mask)
150{
151 if (nents == SG_MAX_SINGLE_ALLOC) {
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161 void *ptr = (void *) __get_free_page(gfp_mask);
162 kmemleak_alloc(ptr, PAGE_SIZE, 1, gfp_mask);
163 return ptr;
164 } else
165 return kmalloc_array(nents, sizeof(struct scatterlist),
166 gfp_mask);
167}
168
169static void sg_kfree(struct scatterlist *sg, unsigned int nents)
170{
171 if (nents == SG_MAX_SINGLE_ALLOC) {
172 kmemleak_free(sg);
173 free_page((unsigned long) sg);
174 } else
175 kfree(sg);
176}
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193void __sg_free_table(struct sg_table *table, unsigned int max_ents,
194 unsigned int nents_first_chunk, sg_free_fn *free_fn,
195 unsigned int num_ents)
196{
197 struct scatterlist *sgl, *next;
198 unsigned curr_max_ents = nents_first_chunk ?: max_ents;
199
200 if (unlikely(!table->sgl))
201 return;
202
203 sgl = table->sgl;
204 while (num_ents) {
205 unsigned int alloc_size = num_ents;
206 unsigned int sg_size;
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212
213
214 if (alloc_size > curr_max_ents) {
215 next = sg_chain_ptr(&sgl[curr_max_ents - 1]);
216 alloc_size = curr_max_ents;
217 sg_size = alloc_size - 1;
218 } else {
219 sg_size = alloc_size;
220 next = NULL;
221 }
222
223 num_ents -= sg_size;
224 if (nents_first_chunk)
225 nents_first_chunk = 0;
226 else
227 free_fn(sgl, alloc_size);
228 sgl = next;
229 curr_max_ents = max_ents;
230 }
231
232 table->sgl = NULL;
233}
234EXPORT_SYMBOL(__sg_free_table);
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240
241void sg_free_append_table(struct sg_append_table *table)
242{
243 __sg_free_table(&table->sgt, SG_MAX_SINGLE_ALLOC, false, sg_kfree,
244 table->total_nents);
245}
246EXPORT_SYMBOL(sg_free_append_table);
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253
254void sg_free_table(struct sg_table *table)
255{
256 __sg_free_table(table, SG_MAX_SINGLE_ALLOC, false, sg_kfree,
257 table->orig_nents);
258}
259EXPORT_SYMBOL(sg_free_table);
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282int __sg_alloc_table(struct sg_table *table, unsigned int nents,
283 unsigned int max_ents, struct scatterlist *first_chunk,
284 unsigned int nents_first_chunk, gfp_t gfp_mask,
285 sg_alloc_fn *alloc_fn)
286{
287 struct scatterlist *sg, *prv;
288 unsigned int left;
289 unsigned curr_max_ents = nents_first_chunk ?: max_ents;
290 unsigned prv_max_ents;
291
292 memset(table, 0, sizeof(*table));
293
294 if (nents == 0)
295 return -EINVAL;
296#ifdef CONFIG_ARCH_NO_SG_CHAIN
297 if (WARN_ON_ONCE(nents > max_ents))
298 return -EINVAL;
299#endif
300
301 left = nents;
302 prv = NULL;
303 do {
304 unsigned int sg_size, alloc_size = left;
305
306 if (alloc_size > curr_max_ents) {
307 alloc_size = curr_max_ents;
308 sg_size = alloc_size - 1;
309 } else
310 sg_size = alloc_size;
311
312 left -= sg_size;
313
314 if (first_chunk) {
315 sg = first_chunk;
316 first_chunk = NULL;
317 } else {
318 sg = alloc_fn(alloc_size, gfp_mask);
319 }
320 if (unlikely(!sg)) {
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325
326
327 if (prv)
328 table->nents = ++table->orig_nents;
329
330 return -ENOMEM;
331 }
332
333 sg_init_table(sg, alloc_size);
334 table->nents = table->orig_nents += sg_size;
335
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337
338
339
340 if (prv)
341 sg_chain(prv, prv_max_ents, sg);
342 else
343 table->sgl = sg;
344
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346
347
348 if (!left)
349 sg_mark_end(&sg[sg_size - 1]);
350
351 prv = sg;
352 prv_max_ents = curr_max_ents;
353 curr_max_ents = max_ents;
354 } while (left);
355
356 return 0;
357}
358EXPORT_SYMBOL(__sg_alloc_table);
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370
371int sg_alloc_table(struct sg_table *table, unsigned int nents, gfp_t gfp_mask)
372{
373 int ret;
374
375 ret = __sg_alloc_table(table, nents, SG_MAX_SINGLE_ALLOC,
376 NULL, 0, gfp_mask, sg_kmalloc);
377 if (unlikely(ret))
378 sg_free_table(table);
379 return ret;
380}
381EXPORT_SYMBOL(sg_alloc_table);
382
383static struct scatterlist *get_next_sg(struct sg_append_table *table,
384 struct scatterlist *cur,
385 unsigned long needed_sges,
386 gfp_t gfp_mask)
387{
388 struct scatterlist *new_sg, *next_sg;
389 unsigned int alloc_size;
390
391 if (cur) {
392 next_sg = sg_next(cur);
393
394 if (!sg_is_last(next_sg) || needed_sges == 1)
395 return next_sg;
396 }
397
398 alloc_size = min_t(unsigned long, needed_sges, SG_MAX_SINGLE_ALLOC);
399 new_sg = sg_kmalloc(alloc_size, gfp_mask);
400 if (!new_sg)
401 return ERR_PTR(-ENOMEM);
402 sg_init_table(new_sg, alloc_size);
403 if (cur) {
404 table->total_nents += alloc_size - 1;
405 __sg_chain(next_sg, new_sg);
406 } else {
407 table->sgt.sgl = new_sg;
408 table->total_nents = alloc_size;
409 }
410 return new_sg;
411}
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442int sg_alloc_append_table_from_pages(struct sg_append_table *sgt_append,
443 struct page **pages, unsigned int n_pages, unsigned int offset,
444 unsigned long size, unsigned int max_segment,
445 unsigned int left_pages, gfp_t gfp_mask)
446{
447 unsigned int chunks, cur_page, seg_len, i, prv_len = 0;
448 unsigned int added_nents = 0;
449 struct scatterlist *s = sgt_append->prv;
450
451
452
453
454
455 max_segment = ALIGN_DOWN(max_segment, PAGE_SIZE);
456 if (WARN_ON(max_segment < PAGE_SIZE))
457 return -EINVAL;
458
459 if (IS_ENABLED(CONFIG_ARCH_NO_SG_CHAIN) && sgt_append->prv)
460 return -EOPNOTSUPP;
461
462 if (sgt_append->prv) {
463 unsigned long paddr =
464 (page_to_pfn(sg_page(sgt_append->prv)) * PAGE_SIZE +
465 sgt_append->prv->offset + sgt_append->prv->length) /
466 PAGE_SIZE;
467
468 if (WARN_ON(offset))
469 return -EINVAL;
470
471
472 prv_len = sgt_append->prv->length;
473 while (n_pages && page_to_pfn(pages[0]) == paddr) {
474 if (sgt_append->prv->length + PAGE_SIZE > max_segment)
475 break;
476 sgt_append->prv->length += PAGE_SIZE;
477 paddr++;
478 pages++;
479 n_pages--;
480 }
481 if (!n_pages)
482 goto out;
483 }
484
485
486 chunks = 1;
487 seg_len = 0;
488 for (i = 1; i < n_pages; i++) {
489 seg_len += PAGE_SIZE;
490 if (seg_len >= max_segment ||
491 page_to_pfn(pages[i]) != page_to_pfn(pages[i - 1]) + 1) {
492 chunks++;
493 seg_len = 0;
494 }
495 }
496
497
498 cur_page = 0;
499 for (i = 0; i < chunks; i++) {
500 unsigned int j, chunk_size;
501
502
503 seg_len = 0;
504 for (j = cur_page + 1; j < n_pages; j++) {
505 seg_len += PAGE_SIZE;
506 if (seg_len >= max_segment ||
507 page_to_pfn(pages[j]) !=
508 page_to_pfn(pages[j - 1]) + 1)
509 break;
510 }
511
512
513 s = get_next_sg(sgt_append, s, chunks - i + left_pages,
514 gfp_mask);
515 if (IS_ERR(s)) {
516
517
518
519
520 if (sgt_append->prv)
521 sgt_append->prv->length = prv_len;
522 return PTR_ERR(s);
523 }
524 chunk_size = ((j - cur_page) << PAGE_SHIFT) - offset;
525 sg_set_page(s, pages[cur_page],
526 min_t(unsigned long, size, chunk_size), offset);
527 added_nents++;
528 size -= chunk_size;
529 offset = 0;
530 cur_page = j;
531 }
532 sgt_append->sgt.nents += added_nents;
533 sgt_append->sgt.orig_nents = sgt_append->sgt.nents;
534 sgt_append->prv = s;
535out:
536 if (!left_pages)
537 sg_mark_end(s);
538 return 0;
539}
540EXPORT_SYMBOL(sg_alloc_append_table_from_pages);
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565int sg_alloc_table_from_pages_segment(struct sg_table *sgt, struct page **pages,
566 unsigned int n_pages, unsigned int offset,
567 unsigned long size, unsigned int max_segment,
568 gfp_t gfp_mask)
569{
570 struct sg_append_table append = {};
571 int err;
572
573 err = sg_alloc_append_table_from_pages(&append, pages, n_pages, offset,
574 size, max_segment, 0, gfp_mask);
575 if (err) {
576 sg_free_append_table(&append);
577 return err;
578 }
579 memcpy(sgt, &append.sgt, sizeof(*sgt));
580 WARN_ON(append.total_nents != sgt->orig_nents);
581 return 0;
582}
583EXPORT_SYMBOL(sg_alloc_table_from_pages_segment);
584
585#ifdef CONFIG_SGL_ALLOC
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598struct scatterlist *sgl_alloc_order(unsigned long long length,
599 unsigned int order, bool chainable,
600 gfp_t gfp, unsigned int *nent_p)
601{
602 struct scatterlist *sgl, *sg;
603 struct page *page;
604 unsigned int nent, nalloc;
605 u32 elem_len;
606
607 nent = round_up(length, PAGE_SIZE << order) >> (PAGE_SHIFT + order);
608
609 if (length > (nent << (PAGE_SHIFT + order)))
610 return NULL;
611 nalloc = nent;
612 if (chainable) {
613
614 if (nalloc + 1 < nalloc)
615 return NULL;
616 nalloc++;
617 }
618 sgl = kmalloc_array(nalloc, sizeof(struct scatterlist),
619 gfp & ~GFP_DMA);
620 if (!sgl)
621 return NULL;
622
623 sg_init_table(sgl, nalloc);
624 sg = sgl;
625 while (length) {
626 elem_len = min_t(u64, length, PAGE_SIZE << order);
627 page = alloc_pages(gfp, order);
628 if (!page) {
629 sgl_free_order(sgl, order);
630 return NULL;
631 }
632
633 sg_set_page(sg, page, elem_len, 0);
634 length -= elem_len;
635 sg = sg_next(sg);
636 }
637 WARN_ONCE(length, "length = %lld\n", length);
638 if (nent_p)
639 *nent_p = nent;
640 return sgl;
641}
642EXPORT_SYMBOL(sgl_alloc_order);
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652struct scatterlist *sgl_alloc(unsigned long long length, gfp_t gfp,
653 unsigned int *nent_p)
654{
655 return sgl_alloc_order(length, 0, false, gfp, nent_p);
656}
657EXPORT_SYMBOL(sgl_alloc);
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672void sgl_free_n_order(struct scatterlist *sgl, int nents, int order)
673{
674 struct scatterlist *sg;
675 struct page *page;
676 int i;
677
678 for_each_sg(sgl, sg, nents, i) {
679 if (!sg)
680 break;
681 page = sg_page(sg);
682 if (page)
683 __free_pages(page, order);
684 }
685 kfree(sgl);
686}
687EXPORT_SYMBOL(sgl_free_n_order);
688
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694void sgl_free_order(struct scatterlist *sgl, int order)
695{
696 sgl_free_n_order(sgl, INT_MAX, order);
697}
698EXPORT_SYMBOL(sgl_free_order);
699
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703
704void sgl_free(struct scatterlist *sgl)
705{
706 sgl_free_order(sgl, 0);
707}
708EXPORT_SYMBOL(sgl_free);
709
710#endif
711
712void __sg_page_iter_start(struct sg_page_iter *piter,
713 struct scatterlist *sglist, unsigned int nents,
714 unsigned long pgoffset)
715{
716 piter->__pg_advance = 0;
717 piter->__nents = nents;
718
719 piter->sg = sglist;
720 piter->sg_pgoffset = pgoffset;
721}
722EXPORT_SYMBOL(__sg_page_iter_start);
723
724static int sg_page_count(struct scatterlist *sg)
725{
726 return PAGE_ALIGN(sg->offset + sg->length) >> PAGE_SHIFT;
727}
728
729bool __sg_page_iter_next(struct sg_page_iter *piter)
730{
731 if (!piter->__nents || !piter->sg)
732 return false;
733
734 piter->sg_pgoffset += piter->__pg_advance;
735 piter->__pg_advance = 1;
736
737 while (piter->sg_pgoffset >= sg_page_count(piter->sg)) {
738 piter->sg_pgoffset -= sg_page_count(piter->sg);
739 piter->sg = sg_next(piter->sg);
740 if (!--piter->__nents || !piter->sg)
741 return false;
742 }
743
744 return true;
745}
746EXPORT_SYMBOL(__sg_page_iter_next);
747
748static int sg_dma_page_count(struct scatterlist *sg)
749{
750 return PAGE_ALIGN(sg->offset + sg_dma_len(sg)) >> PAGE_SHIFT;
751}
752
753bool __sg_page_iter_dma_next(struct sg_dma_page_iter *dma_iter)
754{
755 struct sg_page_iter *piter = &dma_iter->base;
756
757 if (!piter->__nents || !piter->sg)
758 return false;
759
760 piter->sg_pgoffset += piter->__pg_advance;
761 piter->__pg_advance = 1;
762
763 while (piter->sg_pgoffset >= sg_dma_page_count(piter->sg)) {
764 piter->sg_pgoffset -= sg_dma_page_count(piter->sg);
765 piter->sg = sg_next(piter->sg);
766 if (!--piter->__nents || !piter->sg)
767 return false;
768 }
769
770 return true;
771}
772EXPORT_SYMBOL(__sg_page_iter_dma_next);
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786void sg_miter_start(struct sg_mapping_iter *miter, struct scatterlist *sgl,
787 unsigned int nents, unsigned int flags)
788{
789 memset(miter, 0, sizeof(struct sg_mapping_iter));
790
791 __sg_page_iter_start(&miter->piter, sgl, nents, 0);
792 WARN_ON(!(flags & (SG_MITER_TO_SG | SG_MITER_FROM_SG)));
793 miter->__flags = flags;
794}
795EXPORT_SYMBOL(sg_miter_start);
796
797static bool sg_miter_get_next_page(struct sg_mapping_iter *miter)
798{
799 if (!miter->__remaining) {
800 struct scatterlist *sg;
801
802 if (!__sg_page_iter_next(&miter->piter))
803 return false;
804
805 sg = miter->piter.sg;
806
807 miter->__offset = miter->piter.sg_pgoffset ? 0 : sg->offset;
808 miter->piter.sg_pgoffset += miter->__offset >> PAGE_SHIFT;
809 miter->__offset &= PAGE_SIZE - 1;
810 miter->__remaining = sg->offset + sg->length -
811 (miter->piter.sg_pgoffset << PAGE_SHIFT) -
812 miter->__offset;
813 miter->__remaining = min_t(unsigned long, miter->__remaining,
814 PAGE_SIZE - miter->__offset);
815 }
816
817 return true;
818}
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838bool sg_miter_skip(struct sg_mapping_iter *miter, off_t offset)
839{
840 sg_miter_stop(miter);
841
842 while (offset) {
843 off_t consumed;
844
845 if (!sg_miter_get_next_page(miter))
846 return false;
847
848 consumed = min_t(off_t, offset, miter->__remaining);
849 miter->__offset += consumed;
850 miter->__remaining -= consumed;
851 offset -= consumed;
852 }
853
854 return true;
855}
856EXPORT_SYMBOL(sg_miter_skip);
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875bool sg_miter_next(struct sg_mapping_iter *miter)
876{
877 sg_miter_stop(miter);
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883 if (!sg_miter_get_next_page(miter))
884 return false;
885
886 miter->page = sg_page_iter_page(&miter->piter);
887 miter->consumed = miter->length = miter->__remaining;
888
889 if (miter->__flags & SG_MITER_ATOMIC)
890 miter->addr = kmap_atomic(miter->page) + miter->__offset;
891 else
892 miter->addr = kmap(miter->page) + miter->__offset;
893
894 return true;
895}
896EXPORT_SYMBOL(sg_miter_next);
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912void sg_miter_stop(struct sg_mapping_iter *miter)
913{
914 WARN_ON(miter->consumed > miter->length);
915
916
917 if (miter->addr) {
918 miter->__offset += miter->consumed;
919 miter->__remaining -= miter->consumed;
920
921 if (miter->__flags & SG_MITER_TO_SG)
922 flush_dcache_page(miter->page);
923
924 if (miter->__flags & SG_MITER_ATOMIC) {
925 WARN_ON_ONCE(preemptible());
926 kunmap_atomic(miter->addr);
927 } else
928 kunmap(miter->page);
929
930 miter->page = NULL;
931 miter->addr = NULL;
932 miter->length = 0;
933 miter->consumed = 0;
934 }
935}
936EXPORT_SYMBOL(sg_miter_stop);
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951size_t sg_copy_buffer(struct scatterlist *sgl, unsigned int nents, void *buf,
952 size_t buflen, off_t skip, bool to_buffer)
953{
954 unsigned int offset = 0;
955 struct sg_mapping_iter miter;
956 unsigned int sg_flags = SG_MITER_ATOMIC;
957
958 if (to_buffer)
959 sg_flags |= SG_MITER_FROM_SG;
960 else
961 sg_flags |= SG_MITER_TO_SG;
962
963 sg_miter_start(&miter, sgl, nents, sg_flags);
964
965 if (!sg_miter_skip(&miter, skip))
966 return 0;
967
968 while ((offset < buflen) && sg_miter_next(&miter)) {
969 unsigned int len;
970
971 len = min(miter.length, buflen - offset);
972
973 if (to_buffer)
974 memcpy(buf + offset, miter.addr, len);
975 else
976 memcpy(miter.addr, buf + offset, len);
977
978 offset += len;
979 }
980
981 sg_miter_stop(&miter);
982
983 return offset;
984}
985EXPORT_SYMBOL(sg_copy_buffer);
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997size_t sg_copy_from_buffer(struct scatterlist *sgl, unsigned int nents,
998 const void *buf, size_t buflen)
999{
1000 return sg_copy_buffer(sgl, nents, (void *)buf, buflen, 0, false);
1001}
1002EXPORT_SYMBOL(sg_copy_from_buffer);
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1014size_t sg_copy_to_buffer(struct scatterlist *sgl, unsigned int nents,
1015 void *buf, size_t buflen)
1016{
1017 return sg_copy_buffer(sgl, nents, buf, buflen, 0, true);
1018}
1019EXPORT_SYMBOL(sg_copy_to_buffer);
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032size_t sg_pcopy_from_buffer(struct scatterlist *sgl, unsigned int nents,
1033 const void *buf, size_t buflen, off_t skip)
1034{
1035 return sg_copy_buffer(sgl, nents, (void *)buf, buflen, skip, false);
1036}
1037EXPORT_SYMBOL(sg_pcopy_from_buffer);
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050size_t sg_pcopy_to_buffer(struct scatterlist *sgl, unsigned int nents,
1051 void *buf, size_t buflen, off_t skip)
1052{
1053 return sg_copy_buffer(sgl, nents, buf, buflen, skip, true);
1054}
1055EXPORT_SYMBOL(sg_pcopy_to_buffer);
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066size_t sg_zero_buffer(struct scatterlist *sgl, unsigned int nents,
1067 size_t buflen, off_t skip)
1068{
1069 unsigned int offset = 0;
1070 struct sg_mapping_iter miter;
1071 unsigned int sg_flags = SG_MITER_ATOMIC | SG_MITER_TO_SG;
1072
1073 sg_miter_start(&miter, sgl, nents, sg_flags);
1074
1075 if (!sg_miter_skip(&miter, skip))
1076 return false;
1077
1078 while (offset < buflen && sg_miter_next(&miter)) {
1079 unsigned int len;
1080
1081 len = min(miter.length, buflen - offset);
1082 memset(miter.addr, 0, len);
1083
1084 offset += len;
1085 }
1086
1087 sg_miter_stop(&miter);
1088 return offset;
1089}
1090EXPORT_SYMBOL(sg_zero_buffer);
1091