The existing ioctl(SG_GET_SCSI_ID) fills a object of type
struct sg_scsi_id whose last field is int unused[2]. Add
an anonymous union with u8 scsi_lun[8] sharing those last
8 bytes. This patch will place the current device's full
LUN in the scsi_lun array using T10's preferred LUN
format (i.e. an array of 8 bytes) when
ioctl(SG_GET_SCSI_ID) is called.
Note that structure already contains a 'lun' field but that
is a 32 bit integer. Users of this upgrade should choose
the scsi_lun array field henceforth but existing code
can remain as it is and will get the same 'lun' value with
the version 3 or version 4 driver.
Reviewed-by: Hannes Reinecke <hare@xxxxxxxx>
Signed-off-by: Douglas Gilbert <dgilbert@xxxxxxxxxxxx>
---
drivers/scsi/sg.c | 6 ++++--
include/uapi/scsi/sg.h | 5 ++++-
2 files changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/scsi/sg.c b/drivers/scsi/sg.c
index 5e5e66bdc912..98e8d9f9b0c5 100644
--- a/drivers/scsi/sg.c
+++ b/drivers/scsi/sg.c
@@ -1882,6 +1882,7 @@ static int
sg_ctl_scsi_id(struct scsi_device *sdev, struct sg_fd *sfp, void __user *p)
{
struct sg_scsi_id ss_id;
+ struct scsi_lun lun8b;
SG_LOG(3, sfp, "%s: SG_GET_SCSI_ID\n", __func__);
ss_id.host_no = sdev->host->host_no;
@@ -1891,8 +1892,9 @@ sg_ctl_scsi_id(struct scsi_device *sdev, struct sg_fd *sfp, void __user *p)
ss_id.scsi_type = sdev->type;
ss_id.h_cmd_per_lun = sdev->host->cmd_per_lun;
ss_id.d_queue_depth = sdev->queue_depth;
- ss_id.unused[0] = 0;
- ss_id.unused[1] = 0;
+ int_to_scsilun(sdev->lun, &lun8b);
+ /* ss_id.scsi_lun is in an anonymous union with 'int unused[2]' */
+ memcpy(ss_id.scsi_lun, lun8b.scsi_lun, 8);
if (copy_to_user(p, &ss_id, sizeof(struct sg_scsi_id)))
return -EFAULT;
return 0;
diff --git a/include/uapi/scsi/sg.h b/include/uapi/scsi/sg.h
index c20f6dde81a9..1696d3499b0b 100644
--- a/include/uapi/scsi/sg.h
+++ b/include/uapi/scsi/sg.h
@@ -135,7 +135,10 @@ typedef struct sg_scsi_id {
int scsi_type; /* TYPE_... defined in scsi/scsi.h */
short h_cmd_per_lun;/* host (adapter) maximum commands per lun */
short d_queue_depth;/* device (or adapter) maximum queue length */
- int unused[2];
+ union {
+ int unused[2]; /* as per version 3 driver */
+ __u8 scsi_lun[8]; /* full 8 byte SCSI LUN [in v4 driver] */
+ };
} sg_scsi_id_t;
/* For backward compatibility v4 driver yields at most SG_MAX_QUEUE of these */
--
2.24.1
