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scsi: simplify scsi_prep_state_check 

Return a blk_status_t directly, and make the code a little more compact
by handling the fast path in the caller.

Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Christoph Hellwig 2018-11-09 14:42:36 +01:00 committed by Jens Axboe
parent 535ac5d3fe
commit c092d4ec53
1 changed files with 48 additions and 54 deletions
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102
drivers/scsi/scsi_lib.c
View File

@ -1240,60 +1240,48 @@ static int scsi_setup_cmnd(struct scsi_device *sdev, struct request *req)
return scsi_setup_fs_cmnd(sdev, req);
}
static int
static blk_status_t
scsi_prep_state_check(struct scsi_device *sdev, struct request *req)
{
int ret = BLKPREP_OK;
/*
* If the device is not in running state we will reject some
* or all commands.
*/
if (unlikely(sdev->sdev_state != SDEV_RUNNING)) {
switch (sdev->sdev_state) {
case SDEV_OFFLINE:
case SDEV_TRANSPORT_OFFLINE:
/*
* If the device is offline we refuse to process any
* commands. The device must be brought online
* before trying any recovery commands.
*/
sdev_printk(KERN_ERR, sdev,
"rejecting I/O to offline device\n");
ret = BLKPREP_KILL;
break;
case SDEV_DEL:
/*
* If the device is fully deleted, we refuse to
* process any commands as well.
*/
sdev_printk(KERN_ERR, sdev,
"rejecting I/O to dead device\n");
ret = BLKPREP_KILL;
break;
case SDEV_BLOCK:
case SDEV_CREATED_BLOCK:
ret = BLKPREP_DEFER;
break;
case SDEV_QUIESCE:
/*
* If the devices is blocked we defer normal commands.
*/
if (req && !(req->rq_flags & RQF_PREEMPT))
ret = BLKPREP_DEFER;
break;
default:
/*
* For any other not fully online state we only allow
* special commands. In particular any user initiated
* command is not allowed.
*/
if (req && !(req->rq_flags & RQF_PREEMPT))
ret = BLKPREP_KILL;
break;
}
switch (sdev->sdev_state) {
case SDEV_OFFLINE:
case SDEV_TRANSPORT_OFFLINE:
/*
* If the device is offline we refuse to process any
* commands. The device must be brought online
* before trying any recovery commands.
*/
sdev_printk(KERN_ERR, sdev,
"rejecting I/O to offline device\n");
return BLK_STS_IOERR;
case SDEV_DEL:
/*
* If the device is fully deleted, we refuse to
* process any commands as well.
*/
sdev_printk(KERN_ERR, sdev,
"rejecting I/O to dead device\n");
return BLK_STS_IOERR;
case SDEV_BLOCK:
case SDEV_CREATED_BLOCK:
return BLK_STS_RESOURCE;
case SDEV_QUIESCE:
/*
* If the devices is blocked we defer normal commands.
*/
if (req && !(req->rq_flags & RQF_PREEMPT))
return BLK_STS_RESOURCE;
return BLK_STS_OK;
default:
/*
* For any other not fully online state we only allow
* special commands. In particular any user initiated
* command is not allowed.
*/
if (req && !(req->rq_flags & RQF_PREEMPT))
return BLK_STS_IOERR;
return BLK_STS_OK;
}
return ret;
}
/*
@ -1700,9 +1688,15 @@ static blk_status_t scsi_queue_rq(struct blk_mq_hw_ctx *hctx,
blk_status_t ret;
int reason;
ret = prep_to_mq(scsi_prep_state_check(sdev, req));
if (ret != BLK_STS_OK)
goto out_put_budget;
/*
* If the device is not in running state we will reject some or all
* commands.
*/
if (unlikely(sdev->sdev_state != SDEV_RUNNING)) {
ret = scsi_prep_state_check(sdev, req);
if (ret != BLK_STS_OK)
goto out_put_budget;
}
ret = BLK_STS_RESOURCE;
if (!scsi_target_queue_ready(shost, sdev))