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Commit d40a126b authored by Sowmini Varadhan's avatar Sowmini Varadhan Committed by David S. Miller
Browse files

rds: refactor zcopy code into rds_message_zcopy_from_user 



Move the large block of code predicated on zcopy from
rds_message_copy_from_user into a new function,
rds_message_zcopy_from_user()

Signed-off-by: default avatarSowmini Varadhan <sowmini.varadhan@oracle.com>
Acked-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent c33b3b9f

net/rds/message.c

+60 −48
Original line number Diff line number Diff line
@@ -333,14 +333,14 @@ struct rds_message *rds_message_map_pages(unsigned long *page_addrs, unsigned in 
	return rm;

}



int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from,

			       bool zcopy)

int rds_message_zcopy_from_user(struct rds_message *rm, struct iov_iter *from)

{

	unsigned long to_copy, nbytes;

	unsigned long sg_off;

	struct scatterlist *sg;

	int ret = 0;

	int length = iov_iter_count(from);

	int total_copied = 0;

	struct sk_buff *skb;



	rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from));
@@ -350,15 +350,10 @@ int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from, 
	sg = rm->data.op_sg;

	sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */



	if (zcopy) {

		int total_copied = 0;

		struct sk_buff *skb;



	skb = alloc_skb(0, GFP_KERNEL);

	if (!skb)

		return -ENOMEM;

		BUILD_BUG_ON(sizeof(skb->cb) <

			     max_t(int, sizeof(struct rds_znotifier),

	BUILD_BUG_ON(sizeof(skb->cb) < max_t(int, sizeof(struct rds_znotifier),

					     sizeof(struct rds_zcopy_cookies)));

	rm->data.op_mmp_znotifier = RDS_ZCOPY_SKB(skb);

	if (mm_account_pinned_pages(&rm->data.op_mmp_znotifier->z_mmp,
@@ -397,7 +392,24 @@ int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from, 
	consume_skb(skb);

	rm->data.op_mmp_znotifier = NULL;

	return ret;

	} /* zcopy */

}



int rds_message_copy_from_user(struct rds_message *rm, struct iov_iter *from,

			       bool zcopy)

{

	unsigned long to_copy, nbytes;

	unsigned long sg_off;

	struct scatterlist *sg;

	int ret = 0;



	rm->m_inc.i_hdr.h_len = cpu_to_be32(iov_iter_count(from));



	/* now allocate and copy in the data payload.  */

	sg = rm->data.op_sg;

	sg_off = 0; /* Dear gcc, sg->page will be null from kzalloc. */



	if (zcopy)

		return rds_message_zcopy_from_user(rm, from);



	while (iov_iter_count(from)) {

		if (!sg_page(sg)) {