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scsi: core: Remove scsi_setup_cmnd() and scsi_setup_fs_cmnd()

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Move this trivial functionality into scsi_prepare_cmd() instead of
splitting it over multiple small functions, and update the comments to
better document passthrough commands as the special case.

Link: https://lore.kernel.org/r/20201005084130.143273-10-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Christoph Hellwig 2020-10-05 10:41:29 +02:00 committed by Martin K. Petersen
parent 7007e9dd56
commit 74e5e6c1b1
1 changed files with 18 additions and 33 deletions
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51
drivers/scsi/scsi_lib.c
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@ -1190,38 +1190,6 @@ static blk_status_t scsi_setup_scsi_cmnd(struct scsi_device *sdev,
return BLK_STS_OK;
}
/*
* Setup a normal block command. These are simple request from filesystems
* that still need to be translated to SCSI CDBs from the ULD.
*/
static blk_status_t scsi_setup_fs_cmnd(struct scsi_device *sdev,
struct request *req)
{
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
if (unlikely(sdev->handler && sdev->handler->prep_fn)) {
blk_status_t ret = sdev->handler->prep_fn(sdev, req);
if (ret != BLK_STS_OK)
return ret;
}
cmd->cmnd = scsi_req(req)->cmd = scsi_req(req)->__cmd;
memset(cmd->cmnd, 0, BLK_MAX_CDB);
return scsi_cmd_to_driver(cmd)->init_command(cmd);
}
static blk_status_t scsi_setup_cmnd(struct scsi_device *sdev,
struct request *req)
{
struct scsi_cmnd *cmd = blk_mq_rq_to_pdu(req);
cmd->sc_data_direction = rq_dma_dir(req);
if (blk_rq_is_scsi(req))
return scsi_setup_scsi_cmnd(sdev, req);
return scsi_setup_fs_cmnd(sdev, req);
}
static blk_status_t
scsi_device_state_check(struct scsi_device *sdev, struct request *req)
{
@ -1577,6 +1545,7 @@ static blk_status_t scsi_prepare_cmd(struct request *req)
cmd->request = req;
cmd->tag = req->tag;
cmd->prot_op = SCSI_PROT_NORMAL;
cmd->sc_data_direction = rq_dma_dir(req);
sg = (void *)cmd + sizeof(struct scsi_cmnd) + shost->hostt->cmd_size;
cmd->sdb.table.sgl = sg;
@ -1590,7 +1559,23 @@ static blk_status_t scsi_prepare_cmd(struct request *req)
blk_mq_start_request(req);
return scsi_setup_cmnd(sdev, req);
/*
* Special handling for passthrough commands, which don't go to the ULP
* at all:
*/
if (blk_rq_is_scsi(req))
return scsi_setup_scsi_cmnd(sdev, req);
if (sdev->handler && sdev->handler->prep_fn) {
blk_status_t ret = sdev->handler->prep_fn(sdev, req);
if (ret != BLK_STS_OK)
return ret;
}
cmd->cmnd = scsi_req(req)->cmd = scsi_req(req)->__cmd;
memset(cmd->cmnd, 0, BLK_MAX_CDB);
return scsi_cmd_to_driver(cmd)->init_command(cmd);
}
static void scsi_mq_done(struct scsi_cmnd *cmd)