From 28a0bc4120d38a394499382ba21d6965a67a3703 Mon Sep 17 00:00:00 2001 From: "Martin K. Petersen" Date: Wed, 27 Sep 2017 21:35:12 -0400 Subject: scsi: sd: Implement blacklist option for WRITE SAME w/ UNMAP SBC-4 states: "A MAXIMUM UNMAP LBA COUNT field set to a non-zero value indicates the maximum number of LBAs that may be unmapped by an UNMAP command" "A MAXIMUM WRITE SAME LENGTH field set to a non-zero value indicates the maximum number of contiguous logical blocks that the device server allows to be unmapped or written in a single WRITE SAME command." Despite the spec being clear on the topic, some devices incorrectly expect WRITE SAME commands with the UNMAP bit set to be limited to the value reported in MAXIMUM UNMAP LBA COUNT in the Block Limits VPD. Implement a blacklist option that can be used to accommodate devices with this behavior. Cc: Reported-by: Bill Kuzeja Reported-by: Ewan D. Milne Reviewed-by: Ewan D. Milne Tested-by: Laurence Oberman Signed-off-by: Martin K. Petersen --- include/scsi/scsi_device.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/scsi/scsi_device.h') diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h index 82e93ee94708..67c5a9f223f7 100644 --- a/include/scsi/scsi_device.h +++ b/include/scsi/scsi_device.h @@ -192,6 +192,7 @@ struct scsi_device { unsigned no_dif:1; /* T10 PI (DIF) should be disabled */ unsigned broken_fua:1; /* Don't set FUA bit */ unsigned lun_in_cdb:1; /* Store LUN bits in CDB[1] */ + unsigned unmap_limit_for_ws:1; /* Use the UNMAP limit for WRITE SAME */ atomic_t disk_events_disable_depth; /* disable depth for disk events */ -- cgit v1.2.3