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switch memcpy_to_msg() and skb_copy{,_and_csum}_datagram_msg() to primitives

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... making both non-draining.  That means that tcp_recvmsg() becomes
non-draining.  And _that_ would break iscsit_do_rx_data() unless we
	a) make sure tcp_recvmsg() is uniformly non-draining (it is)
	b) make sure it copes with arbitrary (including shifted)
iov_iter (it does, all it uses is iov_iter primitives)
	c) make iscsit_do_rx_data() initialize ->msg_iter only once.

Fortunately, (c) is doable with minimal work and we are rid of one
the two places where kernel send/recvmsg users would be unhappy with
non-draining behaviour.

Actually, that makes all but one of ->recvmsg() instances iov_iter-clean.
The exception is skcipher_recvmsg() and it also isn't hard to convert
to primitives (iov_iter_get_pages() is needed there).  That'll wait
a bit - there's some interplay with ->sendmsg() path for that one.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2014-11-24 18:17:55 -05:00
parent 17836394e5
commit e5a4b0bb80
3 changed files with 28 additions and 54 deletions
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12
drivers/target/iscsi/iscsi_target_util.c
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@@ -1326,21 +1326,19 @@ static int iscsit_do_rx_data(
struct iscsi_conn *conn,
struct iscsi_data_count *count)
{
int data = count->data_length, rx_loop = 0, total_rx = 0, iov_len;
struct kvec *iov_p;
int data = count->data_length, rx_loop = 0, total_rx = 0;
struct msghdr msg;
if (!conn || !conn->sock || !conn->conn_ops)
return -1;
memset(&msg, 0, sizeof(struct msghdr));
iov_p = count->iov;
iov_len = count->iov_count;
iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC,
count->iov, count->iov_count, data);
while (total_rx < data) {
rx_loop = kernel_recvmsg(conn->sock, &msg, iov_p, iov_len,
(data - total_rx), MSG_WAITALL);
rx_loop = sock_recvmsg(conn->sock, &msg,
(data - total_rx), MSG_WAITALL);
if (rx_loop <= 0) {
pr_debug("rx_loop: %d total_rx: %d\n",
rx_loop, total_rx);