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nvme-fcloop: fix port deletes and callbacks

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Now that there are potentially long delays between when a remoteport or
targetport delete calls is made and when the callback occurs (dev_loss_tmo
timeout), no longer block in the delete routines and move the final nport
puts to the callbacks.

Moved the fcloop_nport_get/put/free routines to avoid forward declarations.

Ensure port_info structs used in registrations are nulled in case fields
are not set (ex: devloss_tmo values).

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
James Smart 2017-09-19 14:01:50 -07:00 committed by Jens Axboe
parent 6b71f9e1e8
commit fddc9923c6
1 changed files with 38 additions and 64 deletions
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102
drivers/nvme/target/fcloop.c
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@ -224,8 +224,6 @@ struct fcloop_nport {
struct fcloop_lport *lport;
struct list_head nport_list;
struct kref ref;
struct completion rport_unreg_done;
struct completion tport_unreg_done;
u64 node_name;
u64 port_name;
u32 port_role;
@ -630,6 +628,32 @@ fcloop_fcp_abort(struct nvme_fc_local_port *localport,
schedule_work(&inireq->iniwork);
}
static void
fcloop_nport_free(struct kref *ref)
{
struct fcloop_nport *nport =
container_of(ref, struct fcloop_nport, ref);
unsigned long flags;
spin_lock_irqsave(&fcloop_lock, flags);
list_del(&nport->nport_list);
spin_unlock_irqrestore(&fcloop_lock, flags);
kfree(nport);
}
static void
fcloop_nport_put(struct fcloop_nport *nport)
{
kref_put(&nport->ref, fcloop_nport_free);
}
static int
fcloop_nport_get(struct fcloop_nport *nport)
{
return kref_get_unless_zero(&nport->ref);
}
static void
fcloop_localport_delete(struct nvme_fc_local_port *localport)
{
@ -644,8 +668,7 @@ fcloop_remoteport_delete(struct nvme_fc_remote_port *remoteport)
{
struct fcloop_rport *rport = remoteport->private;
/* release any threads waiting for the unreg to complete */
complete(&rport->nport->rport_unreg_done);
fcloop_nport_put(rport->nport);
}
static void
@ -653,8 +676,7 @@ fcloop_targetport_delete(struct nvmet_fc_target_port *targetport)
{
struct fcloop_tport *tport = targetport->private;
/* release any threads waiting for the unreg to complete */
complete(&tport->nport->tport_unreg_done);
fcloop_nport_put(tport->nport);
}
#define FCLOOP_HW_QUEUES 4
@ -722,6 +744,7 @@ fcloop_create_local_port(struct device *dev, struct device_attribute *attr,
goto out_free_opts;
}
memset(&pinfo, 0, sizeof(pinfo));
pinfo.node_name = opts->wwnn;
pinfo.port_name = opts->wwpn;
pinfo.port_role = opts->roles;
@ -804,32 +827,6 @@ fcloop_delete_local_port(struct device *dev, struct device_attribute *attr,
return ret ? ret : count;
}
static void
fcloop_nport_free(struct kref *ref)
{
struct fcloop_nport *nport =
container_of(ref, struct fcloop_nport, ref);
unsigned long flags;
spin_lock_irqsave(&fcloop_lock, flags);
list_del(&nport->nport_list);
spin_unlock_irqrestore(&fcloop_lock, flags);
kfree(nport);
}
static void
fcloop_nport_put(struct fcloop_nport *nport)
{
kref_put(&nport->ref, fcloop_nport_free);
}
static int
fcloop_nport_get(struct fcloop_nport *nport)
{
return kref_get_unless_zero(&nport->ref);
}
static struct fcloop_nport *
fcloop_alloc_nport(const char *buf, size_t count, bool remoteport)
{
@ -938,6 +935,7 @@ fcloop_create_remote_port(struct device *dev, struct device_attribute *attr,
if (!nport)
return -EIO;
memset(&pinfo, 0, sizeof(pinfo));
pinfo.node_name = nport->node_name;
pinfo.port_name = nport->port_name;
pinfo.port_role = nport->port_role;
@ -979,24 +977,12 @@ __unlink_remote_port(struct fcloop_nport *nport)
}
static int
__wait_remoteport_unreg(struct fcloop_nport *nport, struct fcloop_rport *rport)
__remoteport_unreg(struct fcloop_nport *nport, struct fcloop_rport *rport)
{
int ret;
if (!rport)
return -EALREADY;
init_completion(&nport->rport_unreg_done);
ret = nvme_fc_unregister_remoteport(rport->remoteport);
if (ret)
return ret;
wait_for_completion(&nport->rport_unreg_done);
fcloop_nport_put(nport);
return ret;
return nvme_fc_unregister_remoteport(rport->remoteport);
}
static ssize_t
@ -1029,7 +1015,7 @@ fcloop_delete_remote_port(struct device *dev, struct device_attribute *attr,
if (!nport)
return -ENOENT;
ret = __wait_remoteport_unreg(nport, rport);
ret = __remoteport_unreg(nport, rport);
return ret ? ret : count;
}
@ -1086,24 +1072,12 @@ __unlink_target_port(struct fcloop_nport *nport)
}
static int
__wait_targetport_unreg(struct fcloop_nport *nport, struct fcloop_tport *tport)
__targetport_unreg(struct fcloop_nport *nport, struct fcloop_tport *tport)
{
int ret;
if (!tport)
return -EALREADY;
init_completion(&nport->tport_unreg_done);
ret = nvmet_fc_unregister_targetport(tport->targetport);
if (ret)
return ret;
wait_for_completion(&nport->tport_unreg_done);
fcloop_nport_put(nport);
return ret;
return nvmet_fc_unregister_targetport(tport->targetport);
}
static ssize_t
@ -1136,7 +1110,7 @@ fcloop_delete_target_port(struct device *dev, struct device_attribute *attr,
if (!nport)
return -ENOENT;
ret = __wait_targetport_unreg(nport, tport);
ret = __targetport_unreg(nport, tport);
return ret ? ret : count;
}
@ -1223,11 +1197,11 @@ static void __exit fcloop_exit(void)
spin_unlock_irqrestore(&fcloop_lock, flags);
ret = __wait_targetport_unreg(nport, tport);
ret = __targetport_unreg(nport, tport);
if (ret)
pr_warn("%s: Failed deleting target port\n", __func__);
ret = __wait_remoteport_unreg(nport, rport);
ret = __remoteport_unreg(nport, rport);
if (ret)
pr_warn("%s: Failed deleting remote port\n", __func__);