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staging: lustre: ksocknal_lib_recv_iov(): recvmsg doesn't bugger iovec anymore... 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Oleg Drokin <green@linuxhacker.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Al Viro 2016-08-20 17:34:18 -04:00 committed by Greg Kroah-Hartman
parent 72e62b6c7c
commit 8040ddfb68
1 changed files with 5 additions and 17 deletions
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22
drivers/staging/lustre/lnet/klnds/socklnd/socklnd_lib.c
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@ -201,14 +201,7 @@ ksocknal_lib_eager_ack(struct ksock_conn *conn)
int
ksocknal_lib_recv_iov(struct ksock_conn *conn)
{
#if SOCKNAL_SINGLE_FRAG_RX
struct kvec scratch;
struct kvec *scratchiov = &scratch;
unsigned int niov = 1;
#else
struct kvec *scratchiov = conn->ksnc_scheduler->kss_scratch_iov;
unsigned int niov = conn->ksnc_rx_niov;
#endif
struct kvec *iov = conn->ksnc_rx_iov;
struct msghdr msg = {
.msg_flags = 0
@ -220,20 +213,15 @@ ksocknal_lib_recv_iov(struct ksock_conn *conn)
int sum;
__u32 saved_csum;
/*
* NB we can't trust socket ops to either consume our iovs
* or leave them alone.
*/
LASSERT(niov > 0);
for (nob = i = 0; i < niov; i++) {
scratchiov[i] = iov[i];
nob += scratchiov[i].iov_len;
}
for (nob = i = 0; i < niov; i++)
nob += iov[i].iov_len;
LASSERT(nob <= conn->ksnc_rx_nob_wanted);
rc = kernel_recvmsg(conn->ksnc_sock, &msg, scratchiov, niov, nob,
MSG_DONTWAIT);
iov_iter_kvec(&msg.msg_iter, READ | ITER_KVEC, iov, niov, nob);
rc = sock_recvmsg(conn->ksnc_sock, &msg, MSG_DONTWAIT);
saved_csum = 0;
if (conn->ksnc_proto == &ksocknal_protocol_v2x) {