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[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 <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Mike Christie 2013-04-10 11:24:39 -05:00 committed by James Bottomley
parent 1fc2b00fba
commit 9e45dd7323
1 changed files with 13 additions and 5 deletions
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18
drivers/scsi/iscsi_tcp.c
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@ -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;