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Commit 66db3739 authored by Tadeusz Struk's avatar Tadeusz Struk Committed by David S. Miller
Browse files

crypto: af_alg - Allow to link sgl 



Allow to link af_alg sgls.

Signed-off-by: default avatarTadeusz Struk <tadeusz.struk@intel.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 0345f931

crypto/af_alg.c

+13 −5
Original line number Diff line number Diff line
@@ -358,8 +358,8 @@ int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len) 
	npages = (off + n + PAGE_SIZE - 1) >> PAGE_SHIFT;

	if (WARN_ON(npages == 0))

		return -EINVAL;



	sg_init_table(sgl->sg, npages);

	/* Add one extra for linking */

	sg_init_table(sgl->sg, npages + 1);



	for (i = 0, len = n; i < npages; i++) {

		int plen = min_t(int, len, PAGE_SIZE - off);
@@ -369,18 +369,26 @@ int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len) 
		off = 0;

		len -= plen;

	}

	sg_mark_end(sgl->sg + npages - 1);

	sgl->npages = npages;



	return n;

}

EXPORT_SYMBOL_GPL(af_alg_make_sg);



void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new)

{

	sg_unmark_end(sgl_prev->sg + sgl_prev->npages - 1);

	sg_chain(sgl_prev->sg, sgl_prev->npages + 1, sgl_new->sg);

}

EXPORT_SYMBOL(af_alg_link_sg);



void af_alg_free_sg(struct af_alg_sgl *sgl)

{

	int i;



	i = 0;

	do {

	for (i = 0; i < sgl->npages; i++)

		put_page(sgl->pages[i]);

	} while (!sg_is_last(sgl->sg + (i++)));

}

EXPORT_SYMBOL_GPL(af_alg_free_sg);

include/crypto/if_alg.h

+3 −1
Original line number Diff line number Diff line
@@ -58,8 +58,9 @@ struct af_alg_type { 
};



struct af_alg_sgl {

	struct scatterlist sg[ALG_MAX_PAGES];

	struct scatterlist sg[ALG_MAX_PAGES + 1];

	struct page *pages[ALG_MAX_PAGES];

	unsigned int npages;

};



int af_alg_register_type(const struct af_alg_type *type);
@@ -70,6 +71,7 @@ int af_alg_accept(struct sock *sk, struct socket *newsock); 


int af_alg_make_sg(struct af_alg_sgl *sgl, struct iov_iter *iter, int len);

void af_alg_free_sg(struct af_alg_sgl *sgl);

void af_alg_link_sg(struct af_alg_sgl *sgl_prev, struct af_alg_sgl *sgl_new);



int af_alg_cmsg_send(struct msghdr *msg, struct af_alg_control *con);