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scsi: sd_zbc: factor out sanity checks for zoned commands

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Factor sanity checks for zoned commands from sd_zbc_setup_zone_mgmt_cmnd().

This will help with the introduction of an emulated ZONE_APPEND command.

Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Johannes Thumshirn 2020-05-12 17:55:50 +09:00 committed by Jens Axboe
parent e732671aa5
commit 02494d35ba
1 changed files with 25 additions and 11 deletions
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36
drivers/scsi/sd_zbc.c
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@ -209,6 +209,26 @@ int sd_zbc_report_zones(struct gendisk *disk, sector_t sector,
return ret;
}
static blk_status_t sd_zbc_cmnd_checks(struct scsi_cmnd *cmd)
{
struct request *rq = cmd->request;
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
sector_t sector = blk_rq_pos(rq);
if (!sd_is_zoned(sdkp))
/* Not a zoned device */
return BLK_STS_IOERR;
if (sdkp->device->changed)
return BLK_STS_IOERR;
if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
/* Unaligned request */
return BLK_STS_IOERR;
return BLK_STS_OK;
}
/**
* sd_zbc_setup_zone_mgmt_cmnd - Prepare a zone ZBC_OUT command. The operations
* can be RESET WRITE POINTER, OPEN, CLOSE or FINISH.
@ -223,20 +243,14 @@ blk_status_t sd_zbc_setup_zone_mgmt_cmnd(struct scsi_cmnd *cmd,
unsigned char op, bool all)
{
struct request *rq = cmd->request;
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
sector_t sector = blk_rq_pos(rq);
struct scsi_disk *sdkp = scsi_disk(rq->rq_disk);
sector_t block = sectors_to_logical(sdkp->device, sector);
blk_status_t ret;
if (!sd_is_zoned(sdkp))
/* Not a zoned device */
return BLK_STS_IOERR;
if (sdkp->device->changed)
return BLK_STS_IOERR;
if (sector & (sd_zbc_zone_sectors(sdkp) - 1))
/* Unaligned request */
return BLK_STS_IOERR;
ret = sd_zbc_cmnd_checks(cmd);
if (ret != BLK_STS_OK)
return ret;
cmd->cmd_len = 16;
memset(cmd->cmnd, 0, cmd->cmd_len);