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[SCSI] bfa: Implement LUN Masking feature using the SCSI Slave Callouts.

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This patch re-implements LUN Masking feature using SCSI Slave Callouts.  With
the new design in the slave_alloc entry point; for each new LUN discovered we
check with our internal LUN Masking config whether to expose or to mask this
particular LUN. We return -ENXIO (No such device or address) from slave_alloc
for the LUNs we don't want to be exposed.  We also notify the SCSI mid-layer
to do a sequential LUN scan rather than REPORT_LUNS based scan if LUN masking
is enabled on our HBA port, since a -ENXIO from any LUN in REPORT_LUNS based
scan translates to a scan abort.  This patch also handles the dynamic lun
masking config change from enable to disable or vice-versa by resetting
sdev_bflags of LUN 0 appropriately.

Signed-off-by: Krishna Gudipati <kgudipat@brocade.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Krishna Gudipati
2011-12-20 18:58:32 -08:00
committed by James Bottomley
parent 8ca2dd87e7
commit 5b7db7af52
6 changed files with 112 additions and 4 deletions
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2
drivers/scsi/bfa/bfad_attr.c
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@@ -491,7 +491,7 @@ bfad_im_vport_delete(struct fc_vport *fc_vport)
free_scsi_host:
bfad_scsi_host_free(bfad, im_port);
list_del(&vport->list_entry);
kfree(vport);
return 0;