diff options
| author | Christoph Hellwig <hch@lst.de> | 2022-02-24 18:55:47 +0100 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-03-01 22:21:49 -0500 |
| commit | ce70fd9a551af7424a7dace2a1ba05a7de8eae27 (patch) | |
| tree | c074d0b72237150c6657b632325917f28b1a827a /drivers/scsi/st.c | |
| parent | 71bada345b33b9297e7cc9415db6328c99b554f9 (diff) | |
scsi: core: Remove the cmd field from struct scsi_request
Now that each scsi_request is backed by a scsi_cmnd, there is no need to
indirect the CDB storage. Change all submitters of SCSI passthrough
requests to store the CDB information directly in the scsi_cmnd, and while
doing so allocate the full 32 bytes that cover all Linux supported SCSI
hosts instead of requiring dynamic allocation for > 16 byte CDBs. On
64-bit systems this does not change the size of the scsi_cmnd at all, while
on 32-bit systems it slightly increases it for now, but that increase will
be made up by the removal of the remaining scsi_request fields.
Link: https://lore.kernel.org/r/20220224175552.988286-4-hch@lst.de
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: John Garry <john.garry@huawei.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/st.c')
| -rw-r--r-- | drivers/scsi/st.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c index e869e90e05af..229e819a1797 100644 --- a/drivers/scsi/st.c +++ b/drivers/scsi/st.c @@ -472,10 +472,11 @@ static void st_release_request(struct st_request *streq) static void st_do_stats(struct scsi_tape *STp, struct request *req) { + struct scsi_cmnd *scmd = blk_mq_rq_to_pdu(req); ktime_t now; now = ktime_get(); - if (scsi_req(req)->cmd[0] == WRITE_6) { + if (scmd->cmnd[0] == WRITE_6) { now = ktime_sub(now, STp->stats->write_time); atomic64_add(ktime_to_ns(now), &STp->stats->tot_write_time); atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); @@ -489,7 +490,7 @@ static void st_do_stats(struct scsi_tape *STp, struct request *req) } else atomic64_add(atomic_read(&STp->stats->last_write_size), &STp->stats->write_byte_cnt); - } else if (scsi_req(req)->cmd[0] == READ_6) { + } else if (scmd->cmnd[0] == READ_6) { now = ktime_sub(now, STp->stats->read_time); atomic64_add(ktime_to_ns(now), &STp->stats->tot_read_time); atomic64_add(ktime_to_ns(now), &STp->stats->tot_io_time); @@ -542,12 +543,14 @@ static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, struct rq_map_data *mdata = &SRpnt->stp->buffer->map_data; int err = 0; struct scsi_tape *STp = SRpnt->stp; + struct scsi_cmnd *scmd; req = scsi_alloc_request(SRpnt->stp->device->request_queue, data_direction == DMA_TO_DEVICE ? REQ_OP_DRV_OUT : REQ_OP_DRV_IN, 0); if (IS_ERR(req)) return PTR_ERR(req); + scmd = blk_mq_rq_to_pdu(req); rq = scsi_req(req); req->rq_flags |= RQF_QUIET; @@ -574,9 +577,8 @@ static int st_scsi_execute(struct st_request *SRpnt, const unsigned char *cmd, } SRpnt->bio = req->bio; - rq->cmd_len = COMMAND_SIZE(cmd[0]); - memset(rq->cmd, 0, BLK_MAX_CDB); - memcpy(rq->cmd, cmd, rq->cmd_len); + scmd->cmd_len = COMMAND_SIZE(cmd[0]); + memcpy(scmd->cmnd, cmd, scmd->cmd_len); req->timeout = timeout; rq->retries = retries; req->end_io_data = SRpnt; |