From 9e45dd73234af9a59613dc2989dcc2df2dab847f Mon Sep 17 00:00:00 2001 From: Mike Christie Date: Wed, 10 Apr 2013 11:24:39 -0500 Subject: [PATCH] [SCSI] iscsi_tcp: support PF_MEMALLOC/__GFP_MEMALLOC This patch has software iscsi use PF_MEMALLOC/__GFP_MEMALLOC to be able to better support swap over iscsi disks similar to what was added for nbd. Signed-off-by: Mike Christie Signed-off-by: James Bottomley --- drivers/scsi/iscsi_tcp.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c index 1b91ca0dc1e3..9e2588a6881c 100644 --- a/drivers/scsi/iscsi_tcp.c +++ b/drivers/scsi/iscsi_tcp.c @@ -370,17 +370,24 @@ static inline int iscsi_sw_tcp_xmit_qlen(struct iscsi_conn *conn) static int iscsi_sw_tcp_pdu_xmit(struct iscsi_task *task) { struct iscsi_conn *conn = task->conn; - int rc; + unsigned long pflags = current->flags; + int rc = 0; + + current->flags |= PF_MEMALLOC; while (iscsi_sw_tcp_xmit_qlen(conn)) { rc = iscsi_sw_tcp_xmit(conn); - if (rc == 0) - return -EAGAIN; + if (rc == 0) { + rc = -EAGAIN; + break; + } if (rc < 0) - return rc; + break; + rc = 0; } - return 0; + tsk_restore_flags(current, pflags, PF_MEMALLOC); + return rc; } /* @@ -665,6 +672,7 @@ iscsi_sw_tcp_conn_bind(struct iscsi_cls_session *cls_session, sk->sk_reuse = SK_CAN_REUSE; sk->sk_sndtimeo = 15 * HZ; /* FIXME: make it configurable */ sk->sk_allocation = GFP_ATOMIC; + sk_set_memalloc(sk); iscsi_sw_tcp_conn_set_callbacks(conn); tcp_sw_conn->sendpage = tcp_sw_conn->sock->ops->sendpage; -- GitLab