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authorFUJITA Tomonori <tomof@acm.org>2007-07-11 15:08:17 +0900
committerJames Bottomley <jejb@mulgrave.localdomain>2007-10-12 14:37:50 -0400
commit2c47f9efbedbe5749b6bb16e59bc11d6e460855f (patch)
treebfc1a2154f67c3aa45f92e586678ffc37e5f80eb /include/scsi/scsi_transport.h
parentaebd5e476ecc8ceb53577b20f2a352ff4ceffd8d (diff)
downloadlinux-2c47f9efbedbe5749b6bb16e59bc11d6e460855f.tar.bz2
[SCSI] tgt: add I_T nexus support
tgt uses scsi_host as I_T nexus. This works for ibmvstgt because it creates one scsi_host for one initiator. However, other target drivers don't work like that. This adds I_T nexus support, which enable one scsi_host to handle multiple initiators. New scsi_tgt_it_nexus_create/destroy functions are expected be called transport classes. For example, ibmvstgt creates an initiator remote port, then the srp transport calls tgt_it_nexus_create. tgt doesn't manages I_T nexus, instead it tells tgtd, user-space daemon, to create a new I_T nexus. On the receiving the response from tgtd, tgt calls shost->transportt->it_nexus_response. transports should notify a lld. The srp transport uses it_nexus_response callback in srp_function_template to do that. Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp> Signed-off-by: Mike Christie <michaelc@cs.wisc.edu> Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'include/scsi/scsi_transport.h')
-rw-r--r--include/scsi/scsi_transport.h6
1 files changed, 6 insertions, 0 deletions
diff --git a/include/scsi/scsi_transport.h b/include/scsi/scsi_transport.h
index 3c18baa65a72..af5b3e15e64e 100644
--- a/include/scsi/scsi_transport.h
+++ b/include/scsi/scsi_transport.h
@@ -65,6 +65,12 @@ struct scsi_transport_template {
* EH_NOT_HANDLED Begin normal error recovery
*/
enum scsi_eh_timer_return (* eh_timed_out)(struct scsi_cmnd *);
+
+ /*
+ * Used as callback for the completion of i_t_nexus request
+ * for target drivers.
+ */
+ int (* it_nexus_response)(struct Scsi_Host *, u64, int);
};
#define transport_class_to_shost(tc) \