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authorMike Christie <michaelc@cs.wisc.edu>2008-08-19 18:45:23 -0500
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2008-10-13 09:28:47 -0400
commitfff9d40ce0eb4b46f3e186823ceab6bc02c3e5d3 (patch)
treed36626195678a7b2b8cd60c5e7bae1af9f04ab62 /drivers/scsi/scsi_transport_fc.c
parenta93ce0244f2e94dd48e0b4a2742a4e3bf196ab53 (diff)
[SCSI] fc class: unblock target after calling terminate callback (take 2)
When we block a rport and the driver implements the terminate callback we will fail IO that was running quickly. However IO that was in the scsi_device/block queue sits there until the dev_loss_tmo fires, and this can make it look like IO is lost because new IO will get executed but that IO stuck in the blocked queue sits there for some time longer. With this patch when the fast io fail tmo fires, we will fail the blocked IO and any new IO. This patch also allows all drivers to partially support the fast io fail tmo. If the terminate io callback is not implemented, we will still fail blocked IO and any new IO, so multipath can handle that. This patch also allows the fc and iscsi classes to implement the same behavior. The timers are just unfornately named differently. This patch also fixes the problem where drivers were unblocking the target in their terminate callback, which was needed for rport removal, but for fast io fail timeout it would cause IO to bounce arround the scsi/block layer and the LLD queuecommand. And it for drivers that could have IO stuck but did not have a terminate callback the unblock calls in the class will fix them. v2. - fix up bit setting style to meet JamesS's pref. - Broke out new host byte error changes to make it easier to read. - added JamesS's ack from list. v1 - initial patch Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Acked-by: James Smart <James.Smart@emulex.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Diffstat (limited to 'drivers/scsi/scsi_transport_fc.c')
-rw-r--r--drivers/scsi/scsi_transport_fc.c47
1 files changed, 28 insertions, 19 deletions
diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index d5f7653bb94..1e71abf0607 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -2133,8 +2133,7 @@ fc_attach_transport(struct fc_function_template *ft)
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(roles);
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(port_state);
SETUP_PRIVATE_RPORT_ATTRIBUTE_RD(scsi_target_id);
- if (ft->terminate_rport_io)
- SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
+ SETUP_PRIVATE_RPORT_ATTRIBUTE_RW(fast_io_fail_tmo);
BUG_ON(count > FC_RPORT_NUM_ATTRS);
@@ -2328,6 +2327,22 @@ fc_remove_host(struct Scsi_Host *shost)
}
EXPORT_SYMBOL(fc_remove_host);
+static void fc_terminate_rport_io(struct fc_rport *rport)
+{
+ struct Scsi_Host *shost = rport_to_shost(rport);
+ struct fc_internal *i = to_fc_internal(shost->transportt);
+
+ /* Involve the LLDD if possible to terminate all io on the rport. */
+ if (i->f->terminate_rport_io)
+ i->f->terminate_rport_io(rport);
+
+ /*
+ * must unblock to flush queued IO. The caller will have set
+ * the port_state or flags, so that fc_remote_port_chkready will
+ * fail IO.
+ */
+ scsi_target_unblock(&rport->dev);
+}
/**
* fc_starget_delete - called to delete the scsi decendents of an rport
@@ -2340,13 +2355,8 @@ fc_starget_delete(struct work_struct *work)
{
struct fc_rport *rport =
container_of(work, struct fc_rport, stgt_delete_work);
- struct Scsi_Host *shost = rport_to_shost(rport);
- struct fc_internal *i = to_fc_internal(shost->transportt);
-
- /* Involve the LLDD if possible to terminate all io on the rport. */
- if (i->f->terminate_rport_io)
- i->f->terminate_rport_io(rport);
+ fc_terminate_rport_io(rport);
scsi_remove_target(&rport->dev);
}
@@ -2372,10 +2382,7 @@ fc_rport_final_delete(struct work_struct *work)
if (rport->flags & FC_RPORT_SCAN_PENDING)
scsi_flush_work(shost);
- /* involve the LLDD to terminate all pending i/o */
- if (i->f->terminate_rport_io)
- i->f->terminate_rport_io(rport);
-
+ fc_terminate_rport_io(rport);
/*
* Cancel any outstanding timers. These should really exist
* only when rmmod'ing the LLDD and we're asking for
@@ -2639,7 +2646,8 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel,
spin_lock_irqsave(shost->host_lock, flags);
- rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
+ rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
+ FC_RPORT_DEVLOSS_PENDING);
/* if target, initiate a scan */
if (rport->scsi_target_id != -1) {
@@ -2702,6 +2710,7 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel,
rport->port_id = ids->port_id;
rport->roles = ids->roles;
rport->port_state = FC_PORTSTATE_ONLINE;
+ rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
if (fci->f->dd_fcrport_size)
memset(rport->dd_data, 0,
@@ -2784,7 +2793,6 @@ void
fc_remote_port_delete(struct fc_rport *rport)
{
struct Scsi_Host *shost = rport_to_shost(rport);
- struct fc_internal *i = to_fc_internal(shost->transportt);
int timeout = rport->dev_loss_tmo;
unsigned long flags;
@@ -2830,7 +2838,7 @@ fc_remote_port_delete(struct fc_rport *rport)
/* see if we need to kill io faster than waiting for device loss */
if ((rport->fast_io_fail_tmo != -1) &&
- (rport->fast_io_fail_tmo < timeout) && (i->f->terminate_rport_io))
+ (rport->fast_io_fail_tmo < timeout))
fc_queue_devloss_work(shost, &rport->fail_io_work,
rport->fast_io_fail_tmo * HZ);
@@ -2906,7 +2914,8 @@ fc_remote_port_rolechg(struct fc_rport *rport, u32 roles)
fc_flush_devloss(shost);
spin_lock_irqsave(shost->host_lock, flags);
- rport->flags &= ~FC_RPORT_DEVLOSS_PENDING;
+ rport->flags &= ~(FC_RPORT_FAST_FAIL_TIMEDOUT |
+ FC_RPORT_DEVLOSS_PENDING);
spin_unlock_irqrestore(shost->host_lock, flags);
/* ensure any stgt delete functions are done */
@@ -3001,6 +3010,7 @@ fc_timeout_deleted_rport(struct work_struct *work)
rport->supported_classes = FC_COS_UNSPECIFIED;
rport->roles = FC_PORT_ROLE_UNKNOWN;
rport->port_state = FC_PORTSTATE_NOTPRESENT;
+ rport->flags &= ~FC_RPORT_FAST_FAIL_TIMEDOUT;
/* remove the identifiers that aren't used in the consisting binding */
switch (fc_host->tgtid_bind_type) {
@@ -3043,13 +3053,12 @@ fc_timeout_fail_rport_io(struct work_struct *work)
{
struct fc_rport *rport =
container_of(work, struct fc_rport, fail_io_work.work);
- struct Scsi_Host *shost = rport_to_shost(rport);
- struct fc_internal *i = to_fc_internal(shost->transportt);
if (rport->port_state != FC_PORTSTATE_BLOCKED)
return;
- i->f->terminate_rport_io(rport);
+ rport->flags |= FC_RPORT_FAST_FAIL_TIMEDOUT;
+ fc_terminate_rport_io(rport);
}
/**