132 static inline void *kmap_local_folio(struct folio *folio, size_t offset);
407 static inline void memset_page(struct page *page, size_t offset, int val,  in memset_page()  argument
412 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memset_page()
413 	memset(addr + offset, val, len);  in memset_page()
418 				    size_t offset, size_t len)  in memcpy_from_page()  argument
422 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memcpy_from_page()
423 	memcpy(to, from + offset, len);  in memcpy_from_page()
427 static inline void memcpy_to_page(struct page *page, size_t offset,  in memcpy_to_page()  argument
432 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memcpy_to_page()
433 	memcpy(to + offset, from, len);  in memcpy_to_page()
438 static inline void memzero_page(struct page *page, size_t offset, size_t len)  in memzero_page()  argument
442 	VM_BUG_ON(offset + len > PAGE_SIZE);  in memzero_page()
443 	memset(addr + offset, 0, len);  in memzero_page()
456 		size_t offset, size_t len)  in memcpy_from_folio()  argument
458 	VM_BUG_ON(offset + len > folio_size(folio));  in memcpy_from_folio()
461 		const char *from = kmap_local_folio(folio, offset);  in memcpy_from_folio()
465 		    chunk > PAGE_SIZE - offset_in_page(offset))  in memcpy_from_folio()
466 			chunk = PAGE_SIZE - offset_in_page(offset);  in memcpy_from_folio()
471 		offset += chunk;  in memcpy_from_folio()
483 static inline void memcpy_to_folio(struct folio *folio, size_t offset,  in memcpy_to_folio()  argument
486 	VM_BUG_ON(offset + len > folio_size(folio));  in memcpy_to_folio()
489 		char *to = kmap_local_folio(folio, offset);  in memcpy_to_folio()
493 		    chunk > PAGE_SIZE - offset_in_page(offset))  in memcpy_to_folio()
494 			chunk = PAGE_SIZE - offset_in_page(offset);  in memcpy_to_folio()
499 		offset += chunk;  in memcpy_to_folio()
521 		size_t offset, void *kaddr)  in folio_zero_tail()  argument
523 	size_t len = folio_size(folio) - offset;  in folio_zero_tail()
526 		size_t max = PAGE_SIZE - offset_in_page(offset);  in folio_zero_tail()
532 			offset += max;  in folio_zero_tail()
534 			kaddr = kmap_local_folio(folio, offset);  in folio_zero_tail()
556 static inline void folio_fill_tail(struct folio *folio, size_t offset,  in folio_fill_tail()  argument
559 	char *to = kmap_local_folio(folio, offset);  in folio_fill_tail()
561 	VM_BUG_ON(offset + len > folio_size(folio));  in folio_fill_tail()
564 		size_t max = PAGE_SIZE - offset_in_page(offset);  in folio_fill_tail()
571 			offset += max;  in folio_fill_tail()
573 			to = kmap_local_folio(folio, offset);  in folio_fill_tail()
578 	to = folio_zero_tail(folio, offset + len, to + len);  in folio_fill_tail()
597 	size_t offset = offset_in_folio(folio, pos);  in memcpy_from_file_folio()  local
598 	char *from = kmap_local_folio(folio, offset);  in memcpy_from_file_folio()
601 		offset = offset_in_page(offset);  in memcpy_from_file_folio()
602 		len = min_t(size_t, len, PAGE_SIZE - offset);  in memcpy_from_file_folio()
604 		len = min(len, folio_size(folio) - offset);  in memcpy_from_file_folio()