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iscsi_target: deal with short writes on the tx side 

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-12-21 02:14:47 -05:00
parent c9f2b6aeb9
commit 4113e47b3d
1 changed files with 24 additions and 40 deletions
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64
drivers/target/iscsi/iscsi_target_util.c
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@ -1304,39 +1304,6 @@ static int iscsit_do_rx_data(
return total_rx;
}
static int iscsit_do_tx_data(
struct iscsi_conn *conn,
struct iscsi_data_count *count)
{
int ret, iov_len;
struct kvec *iov_p;
struct msghdr msg;
if (!conn || !conn->sock || !conn->conn_ops)
return -1;
if (count->data_length <= 0) {
pr_err("Data length is: %d\n", count->data_length);
return -1;
}
memset(&msg, 0, sizeof(struct msghdr));
iov_p = count->iov;
iov_len = count->iov_count;
ret = kernel_sendmsg(conn->sock, &msg, iov_p, iov_len,
count->data_length);
if (ret != count->data_length) {
pr_err("Unexpected ret: %d send data %d\n",
ret, count->data_length);
return -EPIPE;
}
pr_debug("ret: %d, sent data: %d\n", ret, count->data_length);
return ret;
}
int rx_data(
struct iscsi_conn *conn,
struct kvec *iov,
@ -1363,18 +1330,35 @@ int tx_data(
int iov_count,
int data)
{
struct iscsi_data_count c;
struct msghdr msg;
int total_tx = 0;
if (!conn || !conn->sock || !conn->conn_ops)
return -1;
memset(&c, 0, sizeof(struct iscsi_data_count));
c.iov = iov;
c.iov_count = iov_count;
c.data_length = data;
c.type = ISCSI_TX_DATA;
if (data <= 0) {
pr_err("Data length is: %d\n", data);
return -1;
}
return iscsit_do_tx_data(conn, &c);
memset(&msg, 0, sizeof(struct msghdr));
iov_iter_kvec(&msg.msg_iter, WRITE | ITER_KVEC,
iov, iov_count, data);
while (msg_data_left(&msg)) {
int tx_loop = sock_sendmsg(conn->sock, &msg);
if (tx_loop <= 0) {
pr_debug("tx_loop: %d total_tx %d\n",
tx_loop, total_tx);
return tx_loop;
}
total_tx += tx_loop;
pr_debug("tx_loop: %d, total_tx: %d, data: %d\n",
tx_loop, total_tx, data);
}
return total_tx;
}
static bool sockaddr_equal(struct sockaddr_storage *x, struct sockaddr_storage *y)