Convert af_alg_sendpage() to use sendmsg() with MSG_SPLICE_PAGES rather than directly splicing in the pages itself. This allows ->sendpage() to be replaced by something that can handle multiple multipage folios in a single transaction. Signed-off-by: David Howells <dhowells@xxxxxxxxxx> cc: Herbert Xu <herbert@xxxxxxxxxxxxxxxxxxx> cc: "David S. Miller" <davem@xxxxxxxxxxxxx> cc: Eric Dumazet <edumazet@xxxxxxxxxx> cc: Jakub Kicinski <kuba@xxxxxxxxxx> cc: Paolo Abeni <pabeni@xxxxxxxxxx> cc: Jens Axboe <axboe@xxxxxxxxx> cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> cc: linux-crypto@xxxxxxxxxxxxxxx cc: netdev@xxxxxxxxxxxxxxx --- crypto/af_alg.c | 52 ++++++++----------------------------------------- 1 file changed, 8 insertions(+), 44 deletions(-) diff --git a/crypto/af_alg.c b/crypto/af_alg.c index 62f4205d42e3..e2fc9051ba39 100644 --- a/crypto/af_alg.c +++ b/crypto/af_alg.c @@ -1118,53 +1118,17 @@ EXPORT_SYMBOL_GPL(af_alg_sendmsg); ssize_t af_alg_sendpage(struct socket *sock, struct page *page, int offset, size_t size, int flags) { - struct sock *sk = sock->sk; - struct alg_sock *ask = alg_sk(sk); - struct af_alg_ctx *ctx = ask->private; - struct af_alg_tsgl *sgl; - int err = -EINVAL; + struct bio_vec bvec; + struct msghdr msg = { + .msg_flags = flags | MSG_SPLICE_PAGES, + }; if (flags & MSG_SENDPAGE_NOTLAST) - flags |= MSG_MORE; - - lock_sock(sk); - if (!ctx->more && ctx->used) - goto unlock; - - if (!size) - goto done; - - if (!af_alg_writable(sk)) { - err = af_alg_wait_for_wmem(sk, flags); - if (err) - goto unlock; - } - - err = af_alg_alloc_tsgl(sk); - if (err) - goto unlock; - - ctx->merge = 0; - sgl = list_entry(ctx->tsgl_list.prev, struct af_alg_tsgl, list); - - if (sgl->cur) - sg_unmark_end(sgl->sg + sgl->cur - 1); - - sg_mark_end(sgl->sg + sgl->cur); - - get_page(page); - sg_set_page(sgl->sg + sgl->cur, page, size, offset); - sgl->cur++; - ctx->used += size; - -done: - ctx->more = flags & MSG_MORE; - -unlock: - af_alg_data_wakeup(sk); - release_sock(sk); + msg.msg_flags |= MSG_MORE; - return err ?: size; + bvec_set_page(&bvec, page, size, offset); + iov_iter_bvec(&msg.msg_iter, ITER_SOURCE, &bvec, 1, size); + return sock_sendmsg(sock, &msg); } EXPORT_SYMBOL_GPL(af_alg_sendpage);