diff options
author | Christoph Hellwig <hch@lst.de> | 2022-02-24 20:55:47 +0300 |
---|---|---|
committer | Martin K. Petersen <martin.petersen@oracle.com> | 2022-03-02 06:21:49 +0300 |
commit | ce70fd9a551af7424a7dace2a1ba05a7de8eae27 (patch) | |
tree | c074d0b72237150c6657b632325917f28b1a827a /drivers/scsi/scsi_error.c | |
parent | 71bada345b33b9297e7cc9415db6328c99b554f9 (diff) | |
download | linux-ce70fd9a551af7424a7dace2a1ba05a7de8eae27.tar.xz |
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/scsi_error.c')
-rw-r--r-- | drivers/scsi/scsi_error.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c index 60a6ae9d1219..5383139a3de8 100644 --- a/drivers/scsi/scsi_error.c +++ b/drivers/scsi/scsi_error.c @@ -980,7 +980,7 @@ static void scsi_abort_eh_cmnd(struct scsi_cmnd *scmd) * @scmd: SCSI command structure to hijack * @ses: structure to save restore information * @cmnd: CDB to send. Can be NULL if no new cmnd is needed - * @cmnd_size: size in bytes of @cmnd (must be <= BLK_MAX_CDB) + * @cmnd_size: size in bytes of @cmnd (must be <= MAX_COMMAND_SIZE) * @sense_bytes: size of sense data to copy. or 0 (if != 0 @cmnd is ignored) * * This function is used to save a scsi command information before re-execution @@ -1002,7 +1002,6 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, * command. */ ses->cmd_len = scmd->cmd_len; - ses->cmnd = scmd->cmnd; ses->data_direction = scmd->sc_data_direction; ses->sdb = scmd->sdb; ses->result = scmd->result; @@ -1013,8 +1012,8 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, scmd->prot_op = SCSI_PROT_NORMAL; scmd->eh_eflags = 0; - scmd->cmnd = ses->eh_cmnd; - memset(scmd->cmnd, 0, BLK_MAX_CDB); + memcpy(ses->cmnd, scmd->cmnd, sizeof(ses->cmnd)); + memset(scmd->cmnd, 0, sizeof(scmd->cmnd)); memset(&scmd->sdb, 0, sizeof(scmd->sdb)); scmd->result = 0; scmd->req.resid_len = 0; @@ -1033,7 +1032,7 @@ void scsi_eh_prep_cmnd(struct scsi_cmnd *scmd, struct scsi_eh_save *ses, } else { scmd->sc_data_direction = DMA_NONE; if (cmnd) { - BUG_ON(cmnd_size > BLK_MAX_CDB); + BUG_ON(cmnd_size > sizeof(scmd->cmnd)); memcpy(scmd->cmnd, cmnd, cmnd_size); scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); } @@ -1066,7 +1065,7 @@ void scsi_eh_restore_cmnd(struct scsi_cmnd* scmd, struct scsi_eh_save *ses) * Restore original data */ scmd->cmd_len = ses->cmd_len; - scmd->cmnd = ses->cmnd; + memcpy(scmd->cmnd, ses->cmnd, sizeof(ses->cmnd)); scmd->sc_data_direction = ses->data_direction; scmd->sdb = ses->sdb; scmd->result = ses->result; @@ -2022,6 +2021,7 @@ static void eh_lock_door_done(struct request *req, blk_status_t status) */ static void scsi_eh_lock_door(struct scsi_device *sdev) { + struct scsi_cmnd *scmd; struct request *req; struct scsi_request *rq; @@ -2029,14 +2029,15 @@ static void scsi_eh_lock_door(struct scsi_device *sdev) if (IS_ERR(req)) return; rq = scsi_req(req); + scmd = blk_mq_rq_to_pdu(req); - rq->cmd[0] = ALLOW_MEDIUM_REMOVAL; - rq->cmd[1] = 0; - rq->cmd[2] = 0; - rq->cmd[3] = 0; - rq->cmd[4] = SCSI_REMOVAL_PREVENT; - rq->cmd[5] = 0; - rq->cmd_len = COMMAND_SIZE(rq->cmd[0]); + scmd->cmnd[0] = ALLOW_MEDIUM_REMOVAL; + scmd->cmnd[1] = 0; + scmd->cmnd[2] = 0; + scmd->cmnd[3] = 0; + scmd->cmnd[4] = SCSI_REMOVAL_PREVENT; + scmd->cmnd[5] = 0; + scmd->cmd_len = COMMAND_SIZE(scmd->cmnd[0]); req->rq_flags |= RQF_QUIET; req->timeout = 10 * HZ; @@ -2399,7 +2400,6 @@ scsi_ioctl_reset(struct scsi_device *dev, int __user *arg) scmd = (struct scsi_cmnd *)(rq + 1); scsi_init_command(dev, scmd); - scmd->cmnd = scsi_req(rq)->cmd; scmd->submitter = SUBMITTED_BY_SCSI_RESET_IOCTL; memset(&scmd->sdb, 0, sizeof(scmd->sdb)); |