net/core/datagram.c

413 	int i, copy = start - offset, start_off = offset, n;
417 	if (copy > 0) {
418 		if (copy > len)
419 			copy = len;
421 				    skb->data + offset, copy, data, to);
423 		if (n != copy)
425 		if ((len -= copy) == 0)
437 		if ((copy = end - offset) > 0) {
441 			if (copy > len)
442 				copy = len;
445 					copy, data, to);
448 			if (n != copy)
450 			if (!(len -= copy))
462 		if ((copy = end - offset) > 0) {
463 			if (copy > len)
464 				copy = len;
466 						to, copy, fault_short, cb, data))
468 			if ((len -= copy) == 0)
470 			offset += copy;
477 	/* This is not really a user copy fault, but rather someone
514  *	@skb: buffer to copy
516  *	@to: iovec iterator to copy to
517  *	@len: amount of data to copy from buffer to iovec
537  *	@skb: buffer to copy
539  *	@to: iovec iterator to copy to
540  *	@len: amount of data to copy from buffer to iovec
553  *	@skb: buffer to copy
555  *	@from: the copy source
556  *	@len: amount of data to copy to buffer from iovec
565 	int i, copy = start - offset;
569 	if (copy > 0) {
570 		if (copy > len)
571 			copy = len;
572 		if (copy_from_iter(skb->data + offset, copy, from) != copy)
574 		if ((len -= copy) == 0)
576 		offset += copy;
587 		if ((copy = end - offset) > 0) {
590 			if (copy > len)
591 				copy = len;
594 					  copy, from);
595 			if (copied != copy)
598 			if (!(len -= copy))
600 			offset += copy;
611 		if ((copy = end - offset) > 0) {
612 			if (copy > len)
613 				copy = len;
616 							from, copy))
618 			if ((len -= copy) == 0)
620 			offset += copy;
718  *	@skb: buffer to copy
719  *	@from: the source to copy from
721  *	The function will first copy up to headlen, and then pin the userspace
728 	int copy = min_t(int, skb_headlen(skb), iov_iter_count(from));
730 	/* copy up to skb headlen */
731 	if (skb_copy_datagram_from_iter(skb, 0, from, copy))
795  *	@skb: buffer to copy
797  *	@to: iovec iterator to copy to
798  *	@len: amount of data to copy from buffer to iovec
827  *		 -EFAULT - fault during copy.