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[SCSI] iscsi: support mutiple daemons 

Patch from david.somayajulu@qlogic.com and cleaned up by Tomo.

qla4xxx is going to have a different daemon so this patch
just routes the events to the right daemon.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Mike Christie 2006-05-18 20:31:39 -05:00 committed by James Bottomley
parent ffbfe92533
commit 790f39a2d5
1 changed files with 27 additions and 11 deletions
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38
drivers/scsi/scsi_transport_iscsi.c
View File

@ -36,6 +36,7 @@
#define ISCSI_HOST_ATTRS 0
struct iscsi_internal {
int daemon_pid;
struct scsi_transport_template t;
struct iscsi_transport *iscsi_transport;
struct list_head list;
@ -145,7 +146,6 @@ static DECLARE_TRANSPORT_CLASS(iscsi_connection_class,
NULL);
static struct sock *nls;
static int daemon_pid;
static DEFINE_MUTEX(rx_queue_mutex);
struct mempool_zone {
@ -572,13 +572,13 @@ mempool_zone_get_skb(struct mempool_zone *zone)
}
static int
iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb)
iscsi_unicast_skb(struct mempool_zone *zone, struct sk_buff *skb, int pid)
{
unsigned long flags;
int rc;
skb_get(skb);
rc = netlink_unicast(nls, skb, daemon_pid, MSG_DONTWAIT);
rc = netlink_unicast(nls, skb, pid, MSG_DONTWAIT);
if (rc < 0) {
mempool_free(skb, zone->pool);
printk(KERN_ERR "iscsi: can not unicast skb (%d)\n", rc);
@ -600,9 +600,14 @@ int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
struct sk_buff *skb;
struct iscsi_uevent *ev;
char *pdu;
struct iscsi_internal *priv;
int len = NLMSG_SPACE(sizeof(*ev) + sizeof(struct iscsi_hdr) +
data_size);
priv = iscsi_if_transport_lookup(conn->transport);
if (!priv)
return -EINVAL;
mempool_zone_complete(conn->z_pdu);
skb = mempool_zone_get_skb(conn->z_pdu);
@ -613,7 +618,7 @@ int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
return -ENOMEM;
}
nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
ev = NLMSG_DATA(nlh);
memset(ev, 0, sizeof(*ev));
ev->transport_handle = iscsi_handle(conn->transport);
@ -626,7 +631,7 @@ int iscsi_recv_pdu(struct iscsi_cls_conn *conn, struct iscsi_hdr *hdr,
memcpy(pdu, hdr, sizeof(struct iscsi_hdr));
memcpy(pdu + sizeof(struct iscsi_hdr), data, data_size);
return iscsi_unicast_skb(conn->z_pdu, skb);
return iscsi_unicast_skb(conn->z_pdu, skb, priv->daemon_pid);
}
EXPORT_SYMBOL_GPL(iscsi_recv_pdu);
@ -635,8 +640,13 @@ void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
struct nlmsghdr *nlh;
struct sk_buff *skb;
struct iscsi_uevent *ev;
struct iscsi_internal *priv;
int len = NLMSG_SPACE(sizeof(*ev));
priv = iscsi_if_transport_lookup(conn->transport);
if (!priv)
return;
mempool_zone_complete(conn->z_error);
skb = mempool_zone_get_skb(conn->z_error);
@ -646,7 +656,7 @@ void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
return;
}
nlh = __nlmsg_put(skb, daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
nlh = __nlmsg_put(skb, priv->daemon_pid, 0, 0, (len - sizeof(*nlh)), 0);
ev = NLMSG_DATA(nlh);
ev->transport_handle = iscsi_handle(conn->transport);
ev->type = ISCSI_KEVENT_CONN_ERROR;
@ -656,7 +666,7 @@ void iscsi_conn_error(struct iscsi_cls_conn *conn, enum iscsi_err error)
ev->r.connerror.cid = conn->cid;
ev->r.connerror.sid = iscsi_conn_get_sid(conn);
iscsi_unicast_skb(conn->z_error, skb);
iscsi_unicast_skb(conn->z_error, skb, priv->daemon_pid);
dev_printk(KERN_INFO, &conn->dev, "iscsi: detected conn error (%d)\n",
error);
@ -686,7 +696,7 @@ iscsi_if_send_reply(int pid, int seq, int type, int done, int multi,
nlh = __nlmsg_put(skb, pid, seq, t, (len - sizeof(*nlh)), 0);
nlh->nlmsg_flags = flags;
memcpy(NLMSG_DATA(nlh), payload, size);
return iscsi_unicast_skb(z_reply, skb);
return iscsi_unicast_skb(z_reply, skb, pid);
}
static int
@ -698,12 +708,17 @@ iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
struct iscsi_cls_conn *conn;
struct nlmsghdr *nlhstat;
struct iscsi_uevent *evstat;
struct iscsi_internal *priv;
int len = NLMSG_SPACE(sizeof(*ev) +
sizeof(struct iscsi_stats) +
sizeof(struct iscsi_stats_custom) *
ISCSI_STATS_CUSTOM_MAX);
int err = 0;
priv = iscsi_if_transport_lookup(transport);
if (!priv)
return -EINVAL;
conn = iscsi_conn_lookup(ev->u.get_stats.sid, ev->u.get_stats.cid);
if (!conn)
return -EEXIST;
@ -720,7 +735,7 @@ iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
return -ENOMEM;
}
nlhstat = __nlmsg_put(skbstat, daemon_pid, 0, 0,
nlhstat = __nlmsg_put(skbstat, priv->daemon_pid, 0, 0,
(len - sizeof(*nlhstat)), 0);
evstat = NLMSG_DATA(nlhstat);
memset(evstat, 0, sizeof(*evstat));
@ -746,7 +761,7 @@ iscsi_if_get_stats(struct iscsi_transport *transport, struct nlmsghdr *nlh)
skb_trim(skbstat, NLMSG_ALIGN(actual_size));
nlhstat->nlmsg_len = actual_size;
err = iscsi_unicast_skb(conn->z_pdu, skbstat);
err = iscsi_unicast_skb(conn->z_pdu, skbstat, priv->daemon_pid);
} while (err < 0 && err != -ECONNREFUSED);
return err;
@ -981,6 +996,8 @@ iscsi_if_recv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
if (!try_module_get(transport->owner))
return -EINVAL;
priv->daemon_pid = NETLINK_CREDS(skb)->pid;
switch (nlh->nlmsg_type) {
case ISCSI_UEVENT_CREATE_SESSION:
err = iscsi_if_create_session(priv, ev);
@ -1073,7 +1090,6 @@ iscsi_if_rx(struct sock *sk, int len)
skb_pull(skb, skb->len);
goto free_skb;
}
daemon_pid = NETLINK_CREDS(skb)->pid;
while (skb->len >= NLMSG_SPACE(0)) {
int err;