iscsi: Use struct scsi_lun in iscsi structs instead of u8[8]

struct scsi_lun is also just a struct with an array of 8 octets (64 bits)
but using it instead in iscsi structs lets us call scsilun_to_int
without a cast, and also lets us copy it using assignment, instead of
memcpy().

Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>

5 files changed, 23 insertions, 24 deletions

diff --git a/drivers/scsi/be2iscsi/be_main.c b/drivers/scsi/be2iscsi/be_main.c
index 94b9a07845d5..7b967ed48962 100644
--- a/drivers/scsi/be2iscsi/be_main.c
+++ b/drivers/scsi/be2iscsi/be_main.c
@@ -3963,11 +3963,10 @@ static int beiscsi_iotask(struct iscsi_task *task, struct scatterlist *sg,
         }
         memcpy(&io_task->cmd_bhs->iscsi_data_pdu.
                dw[offsetof(struct amap_pdu_data_out, lun) / 32],
-               io_task->cmd_bhs->iscsi_hdr.lun, sizeof(struct scsi_lun));
+               &io_task->cmd_bhs->iscsi_hdr.lun, sizeof(struct scsi_lun));
 
         AMAP_SET_BITS(struct amap_iscsi_wrb, lun, pwrb,
-                      cpu_to_be16((unsigned short)io_task->cmd_bhs->iscsi_hdr.
-                                  lun[0]));
+                      cpu_to_be16(*(unsigned short *)&io_task->cmd_bhs->iscsi_hdr.lun));
         AMAP_SET_BITS(struct amap_iscsi_wrb, r2t_exp_dtl, pwrb, xferlen);
         AMAP_SET_BITS(struct amap_iscsi_wrb, wrb_idx, pwrb,
                       io_task->pwrb_handle->wrb_index);
diff --git a/drivers/scsi/bnx2i/bnx2i_hwi.c b/drivers/scsi/bnx2i/bnx2i_hwi.c
index 1b160e12afa3..2b119cc3eac5 100644
--- a/drivers/scsi/bnx2i/bnx2i_hwi.c
+++ b/drivers/scsi/bnx2i/bnx2i_hwi.c
@@ -430,7 +430,7 @@ int bnx2i_send_iscsi_tmf(struct bnx2i_conn *bnx2i_conn,
         default:
                 tmfabort_wqe->ref_itt = RESERVED_ITT;
         }
-        memcpy(scsi_lun, tmfabort_hdr->lun, sizeof(struct scsi_lun));
+        memcpy(scsi_lun, &tmfabort_hdr->lun, sizeof(struct scsi_lun));
         tmfabort_wqe->lun[0] = be32_to_cpu(scsi_lun[0]);
         tmfabort_wqe->lun[1] = be32_to_cpu(scsi_lun[1]);
 
@@ -547,7 +547,7 @@ int bnx2i_send_iscsi_nopout(struct bnx2i_conn *bnx2i_conn,
 
         nopout_wqe->op_code = nopout_hdr->opcode;
         nopout_wqe->op_attr = ISCSI_FLAG_CMD_FINAL;
-        memcpy(nopout_wqe->lun, nopout_hdr->lun, 8);
+        memcpy(nopout_wqe->lun, &nopout_hdr->lun, 8);
 
         if (test_bit(BNX2I_NX2_DEV_57710, &ep->hba->cnic_dev_type)) {
                 u32 tmp = nopout_wqe->lun[0];
@@ -1711,7 +1711,7 @@ static int bnx2i_process_nopin_mesg(struct iscsi_session *session,
                 hdr->flags = ISCSI_FLAG_CMD_FINAL;
                 hdr->itt = task->hdr->itt;
                 hdr->ttt = cpu_to_be32(nop_in->ttt);
-                memcpy(hdr->lun, nop_in->lun, 8);
+                memcpy(&hdr->lun, nop_in->lun, 8);
         }
 done:
         __iscsi_complete_pdu(conn, (struct iscsi_hdr *)hdr, NULL, 0);
@@ -1754,7 +1754,7 @@ static void bnx2i_process_async_mesg(struct iscsi_session *session,
         resp_hdr->opcode = async_cqe->op_code;
         resp_hdr->flags = 0x80;
 
-        memcpy(resp_hdr->lun, async_cqe->lun, 8);
+        memcpy(&resp_hdr->lun, async_cqe->lun, 8);
         resp_hdr->exp_cmdsn = cpu_to_be32(async_cqe->exp_cmd_sn);
         resp_hdr->max_cmdsn = cpu_to_be32(async_cqe->max_cmd_sn);
 
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index c552cd7850ac..57175a7d2ef0 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -169,7 +169,7 @@ void iscsi_prep_data_out_pdu(struct iscsi_task *task, struct iscsi_r2t_info *r2t
         hdr->datasn = cpu_to_be32(r2t->datasn);
         r2t->datasn++;
         hdr->opcode = ISCSI_OP_SCSI_DATA_OUT;
-        memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
+        hdr->lun = task->lun;
         hdr->itt = task->hdr_itt;
         hdr->exp_statsn = r2t->exp_statsn;
         hdr->offset = cpu_to_be32(r2t->data_offset + r2t->sent);
@@ -296,7 +296,7 @@ static int iscsi_check_tmf_restrictions(struct iscsi_task *task, int opcode)
                 /*
                  * Allow PDUs for unrelated LUNs
                  */
-                hdr_lun = scsilun_to_int((struct scsi_lun *)tmf->lun);
+                hdr_lun = scsilun_to_int(&tmf->lun);
                 if (hdr_lun != task->sc->device->lun)
                         return 0;
                 /* fall through */
@@ -389,8 +389,8 @@ static int iscsi_prep_scsi_cmd_pdu(struct iscsi_task *task)
                 return rc;
         hdr->opcode = ISCSI_OP_SCSI_CMD;
         hdr->flags = ISCSI_ATTR_SIMPLE;
-        int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
-        memcpy(task->lun, hdr->lun, sizeof(task->lun));
+        int_to_scsilun(sc->device->lun, &hdr->lun);
+        task->lun = hdr->lun;
         hdr->exp_statsn = cpu_to_be32(conn->exp_statsn);
         cmd_len = sc->cmd_len;
         if (cmd_len < ISCSI_CDB_SIZE)
@@ -968,7 +968,7 @@ static void iscsi_send_nopout(struct iscsi_conn *conn, struct iscsi_nopin *rhdr)
         hdr.flags = ISCSI_FLAG_CMD_FINAL;
 
         if (rhdr) {
-                memcpy(hdr.lun, rhdr->lun, 8);
+                hdr.lun = rhdr->lun;
                 hdr.ttt = rhdr->ttt;
                 hdr.itt = RESERVED_ITT;
         } else
@@ -2092,7 +2092,7 @@ static void iscsi_prep_abort_task_pdu(struct iscsi_task *task,
         hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
         hdr->flags = ISCSI_TM_FUNC_ABORT_TASK & ISCSI_FLAG_TM_FUNC_MASK;
         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
-        memcpy(hdr->lun, task->lun, sizeof(hdr->lun));
+        hdr->lun = task->lun;
         hdr->rtt = task->hdr_itt;
         hdr->refcmdsn = task->cmdsn;
 }
@@ -2233,7 +2233,7 @@ static void iscsi_prep_lun_reset_pdu(struct scsi_cmnd *sc, struct iscsi_tm *hdr)
         hdr->opcode = ISCSI_OP_SCSI_TMFUNC | ISCSI_OP_IMMEDIATE;
         hdr->flags = ISCSI_TM_FUNC_LOGICAL_UNIT_RESET & ISCSI_FLAG_TM_FUNC_MASK;
         hdr->flags |= ISCSI_FLAG_CMD_FINAL;
-        int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
+        int_to_scsilun(sc->device->lun, &hdr->lun);
         hdr->rtt = RESERVED_ITT;
 }
 
diff --git a/include/scsi/iscsi_proto.h b/include/scsi/iscsi_proto.h
index a9c9058ffc60..f5f83534fc13 100644
--- a/include/scsi/iscsi_proto.h
+++ b/include/scsi/iscsi_proto.h
@@ -60,7 +60,7 @@ struct iscsi_hdr {
         uint8_t         rsvd2[2];
         uint8_t         hlength;        /* AHSs total length */
         uint8_t         dlength[3];     /* Data length */
-        uint8_t         lun[8];
+        struct scsi_lun lun;
         itt_t           itt;            /* Initiator Task Tag, opaque for target */
         __be32          ttt;            /* Target Task Tag */
         __be32          statsn;
@@ -122,7 +122,7 @@ struct iscsi_scsi_req {
         __be16 rsvd2;
         uint8_t hlength;
         uint8_t dlength[3];
-        uint8_t lun[8];
+        struct scsi_lun lun;
         itt_t    itt;   /* Initiator Task Tag */
         __be32 data_length;
         __be32 cmdsn;
@@ -198,7 +198,7 @@ struct iscsi_async {
         uint8_t rsvd2[2];
         uint8_t rsvd3;
         uint8_t dlength[3];
-        uint8_t lun[8];
+        struct scsi_lun lun;
         uint8_t rsvd4[8];
         __be32  statsn;
         __be32  exp_cmdsn;
@@ -226,7 +226,7 @@ struct iscsi_nopout {
         __be16  rsvd2;
         uint8_t rsvd3;
         uint8_t dlength[3];
-        uint8_t lun[8];
+        struct scsi_lun lun;
         itt_t    itt;   /* Initiator Task Tag */
         __be32  ttt;    /* Target Transfer Tag */
         __be32  cmdsn;
@@ -241,7 +241,7 @@ struct iscsi_nopin {
         __be16  rsvd2;
         uint8_t rsvd3;
         uint8_t dlength[3];
-        uint8_t lun[8];
+        struct scsi_lun lun;
         itt_t    itt;   /* Initiator Task Tag */
         __be32  ttt;    /* Target Transfer Tag */
         __be32  statsn;
@@ -257,7 +257,7 @@ struct iscsi_tm {
         uint8_t rsvd1[2];
         uint8_t hlength;
         uint8_t dlength[3];
-        uint8_t lun[8];
+        struct scsi_lun lun;
         itt_t    itt;   /* Initiator Task Tag */
         itt_t    rtt;   /* Reference Task Tag */
         __be32  cmdsn;
@@ -315,7 +315,7 @@ struct iscsi_r2t_rsp {
         uint8_t rsvd2[2];
         uint8_t hlength;
         uint8_t dlength[3];
-        uint8_t lun[8];
+        struct scsi_lun lun;
         itt_t    itt;   /* Initiator Task Tag */
         __be32  ttt;    /* Target Transfer Tag */
         __be32  statsn;
@@ -333,7 +333,7 @@ struct iscsi_data {
         uint8_t rsvd2[2];
         uint8_t rsvd3;
         uint8_t dlength[3];
-        uint8_t lun[8];
+        struct scsi_lun lun;
         itt_t    itt;
         __be32  ttt;
         __be32  rsvd4;
@@ -353,7 +353,7 @@ struct iscsi_data_rsp {
         uint8_t cmd_status;
         uint8_t hlength;
         uint8_t dlength[3];
-        uint8_t lun[8];
+        struct scsi_lun lun;
         itt_t    itt;
         __be32  ttt;
         __be32  statsn;
diff --git a/include/scsi/libiscsi.h b/include/scsi/libiscsi.h
index 0f4367751b71..cedcff371c88 100644
--- a/include/scsi/libiscsi.h
+++ b/include/scsi/libiscsi.h
@@ -115,7 +115,7 @@ struct iscsi_task {
         /* copied values in case we need to send tmfs */
         itt_t                   hdr_itt;
         __be32                  cmdsn;
-        uint8_t                 lun[8];
+        struct scsi_lun         lun;
 
         int                     itt;            /* this ITT */