From 0f29b966d60e9a4f5ecff9f3832257b38aea4f13 Mon Sep 17 00:00:00 2001 From: James Smart Date: Fri, 18 Aug 2006 17:33:29 -0400 Subject: [SCSI] FC transport: Add dev_loss_tmo callbacks, and new fast_io_fail_tmo w/ callback This patch adds the following functionality to the FC transport: - dev_loss_tmo LLDD callback : Called to essentially confirm the deletion of an rport. Thus, it is called whenever the dev_loss_tmo fires, or when the rport is deleted due to other circumstances (module unload, etc). It is expected that the callback will initiate the termination of any outstanding i/o on the rport. - fast_io_fail_tmo and LLD callback: There are some cases where it may take a long while to truly determine device loss, but the system is in a multipathing configuration that if the i/o was failed quickly (faster than dev_loss_tmo), it could be redirected to a different path and completed sooner. Many thanks to Mike Reed who cleaned up the initial RFC in support of this post. The original RFC is at: http://marc.theaimsgroup.com/?l=linux-scsi&m=115505981027246&w=2 Signed-off-by: James Smart Signed-off-by: James Bottomley --- include/scsi/scsi_transport_fc.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/scsi') diff --git a/include/scsi/scsi_transport_fc.h b/include/scsi/scsi_transport_fc.h index 0b11eff989e0..fd352323378b 100644 --- a/include/scsi/scsi_transport_fc.h +++ b/include/scsi/scsi_transport_fc.h @@ -195,6 +195,7 @@ struct fc_rport { /* aka fc_starget_attrs */ u32 roles; enum fc_port_state port_state; /* Will only be ONLINE or UNKNOWN */ u32 scsi_target_id; + u32 fast_io_fail_tmo; /* exported data */ void *dd_data; /* Used for driver-specific storage */ @@ -207,6 +208,7 @@ struct fc_rport { /* aka fc_starget_attrs */ struct device dev; struct work_struct dev_loss_work; struct work_struct scan_work; + struct work_struct fail_io_work; struct work_struct stgt_delete_work; struct work_struct rport_delete_work; } __attribute__((aligned(sizeof(unsigned long)))); @@ -445,6 +447,9 @@ struct fc_function_template { int (*issue_fc_host_lip)(struct Scsi_Host *); + void (*dev_loss_tmo_callbk)(struct fc_rport *); + void (*terminate_rport_io)(struct fc_rport *); + /* allocation lengths for host-specific data */ u32 dd_fcrport_size; -- cgit v1.2.3