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scsi: reintroduce scsi_driver.init_command
Instead of letting the ULD play games with the prep_fn move back to the model of a central prep_fn with a callback to the ULD. This already cleans up and shortens the code by itself, and will be required to properly support blk-mq in the SCSI midlayer. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Nicholas Bellinger <nab@linux-iscsi.org> Reviewed-by: Mike Christie <michaelc@cs.wisc.edu> Reviewed-by: Hannes Reinecke <hare@suse.de>
This commit is contained in:
Christoph Hellwig
parent
bc85dc500f
commit
a1b73fc194
@ -1073,15 +1073,7 @@ static struct scsi_cmnd *scsi_get_cmd_from_req(struct scsi_device *sdev,
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int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req)
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{
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struct scsi_cmnd *cmd;
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int ret = scsi_prep_state_check(sdev, req);
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if (ret != BLKPREP_OK)
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return ret;
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cmd = scsi_get_cmd_from_req(sdev, req);
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if (unlikely(!cmd))
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return BLKPREP_DEFER;
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struct scsi_cmnd *cmd = req->special;
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/*
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* BLOCK_PC requests may transfer data, in which case they must
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@ -1125,15 +1117,11 @@ EXPORT_SYMBOL(scsi_setup_blk_pc_cmnd);
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*/
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int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
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{
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struct scsi_cmnd *cmd;
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int ret = scsi_prep_state_check(sdev, req);
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if (ret != BLKPREP_OK)
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return ret;
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struct scsi_cmnd *cmd = req->special;
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if (unlikely(sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh
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&& sdev->scsi_dh_data->scsi_dh->prep_fn)) {
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ret = sdev->scsi_dh_data->scsi_dh->prep_fn(sdev, req);
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int ret = sdev->scsi_dh_data->scsi_dh->prep_fn(sdev, req);
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if (ret != BLKPREP_OK)
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return ret;
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}
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@ -1143,16 +1131,13 @@ int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
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*/
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BUG_ON(!req->nr_phys_segments);
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cmd = scsi_get_cmd_from_req(sdev, req);
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if (unlikely(!cmd))
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return BLKPREP_DEFER;
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memset(cmd->cmnd, 0, BLK_MAX_CDB);
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return scsi_init_io(cmd, GFP_ATOMIC);
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}
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EXPORT_SYMBOL(scsi_setup_fs_cmnd);
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int scsi_prep_state_check(struct scsi_device *sdev, struct request *req)
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static int
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scsi_prep_state_check(struct scsi_device *sdev, struct request *req)
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{
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int ret = BLKPREP_OK;
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@ -1204,9 +1189,9 @@ int scsi_prep_state_check(struct scsi_device *sdev, struct request *req)
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}
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return ret;
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}
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EXPORT_SYMBOL(scsi_prep_state_check);
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int scsi_prep_return(struct request_queue *q, struct request *req, int ret)
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static int
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scsi_prep_return(struct request_queue *q, struct request *req, int ret)
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{
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struct scsi_device *sdev = q->queuedata;
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@ -1237,18 +1222,44 @@ int scsi_prep_return(struct request_queue *q, struct request *req, int ret)
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return ret;
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}
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EXPORT_SYMBOL(scsi_prep_return);
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int scsi_prep_fn(struct request_queue *q, struct request *req)
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static int scsi_prep_fn(struct request_queue *q, struct request *req)
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{
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struct scsi_device *sdev = q->queuedata;
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int ret = BLKPREP_KILL;
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struct scsi_cmnd *cmd;
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int ret;
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if (req->cmd_type == REQ_TYPE_BLOCK_PC)
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ret = scsi_prep_state_check(sdev, req);
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if (ret != BLKPREP_OK)
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goto out;
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cmd = scsi_get_cmd_from_req(sdev, req);
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if (unlikely(!cmd)) {
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ret = BLKPREP_DEFER;
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goto out;
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}
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if (req->cmd_type == REQ_TYPE_FS)
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ret = scsi_cmd_to_driver(cmd)->init_command(cmd);
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else if (req->cmd_type == REQ_TYPE_BLOCK_PC)
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ret = scsi_setup_blk_pc_cmnd(sdev, req);
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else
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ret = BLKPREP_KILL;
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out:
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return scsi_prep_return(q, req, ret);
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}
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EXPORT_SYMBOL(scsi_prep_fn);
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static void scsi_unprep_fn(struct request_queue *q, struct request *req)
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{
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if (req->cmd_type == REQ_TYPE_FS) {
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struct scsi_cmnd *cmd = req->special;
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struct scsi_driver *drv = scsi_cmd_to_driver(cmd);
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if (drv->uninit_command)
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drv->uninit_command(cmd);
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}
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}
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/*
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* scsi_dev_queue_ready: if we can send requests to sdev, return 1 else
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@ -1669,6 +1680,7 @@ struct request_queue *scsi_alloc_queue(struct scsi_device *sdev)
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return NULL;
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blk_queue_prep_rq(q, scsi_prep_fn);
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blk_queue_unprep_rq(q, scsi_unprep_fn);
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blk_queue_softirq_done(q, scsi_softirq_done);
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blk_queue_rq_timed_out(q, scsi_times_out);
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blk_queue_lld_busy(q, scsi_lld_busy);
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@ -109,6 +109,8 @@ static int sd_suspend_system(struct device *);
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static int sd_suspend_runtime(struct device *);
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static int sd_resume(struct device *);
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static void sd_rescan(struct device *);
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static int sd_init_command(struct scsi_cmnd *SCpnt);
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static void sd_uninit_command(struct scsi_cmnd *SCpnt);
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static int sd_done(struct scsi_cmnd *);
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static int sd_eh_action(struct scsi_cmnd *, int);
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static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
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@ -503,6 +505,8 @@ static struct scsi_driver sd_template = {
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.pm = &sd_pm_ops,
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},
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.rescan = sd_rescan,
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.init_command = sd_init_command,
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.uninit_command = sd_uninit_command,
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.done = sd_done,
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.eh_action = sd_eh_action,
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};
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@ -838,9 +842,9 @@ static int scsi_setup_flush_cmnd(struct scsi_device *sdp, struct request *rq)
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return scsi_setup_blk_pc_cmnd(sdp, rq);
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}
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static void sd_unprep_fn(struct request_queue *q, struct request *rq)
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static void sd_uninit_command(struct scsi_cmnd *SCpnt)
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{
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struct scsi_cmnd *SCpnt = rq->special;
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struct request *rq = SCpnt->request;
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if (rq->cmd_flags & REQ_DISCARD) {
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free_page((unsigned long)rq->buffer);
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@ -853,18 +857,10 @@ static void sd_unprep_fn(struct request_queue *q, struct request *rq)
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}
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}
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/**
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* sd_prep_fn - build a scsi (read or write) command from
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* information in the request structure.
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* @SCpnt: pointer to mid-level's per scsi command structure that
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* contains request and into which the scsi command is written
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*
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* Returns 1 if successful and 0 if error (or cannot be done now).
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**/
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static int sd_prep_fn(struct request_queue *q, struct request *rq)
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static int sd_init_command(struct scsi_cmnd *SCpnt)
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{
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struct scsi_cmnd *SCpnt;
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struct scsi_device *sdp = q->queuedata;
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struct request *rq = SCpnt->request;
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struct scsi_device *sdp = SCpnt->device;
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struct gendisk *disk = rq->rq_disk;
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struct scsi_disk *sdkp;
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sector_t block = blk_rq_pos(rq);
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@ -886,12 +882,6 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
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} else if (rq->cmd_flags & REQ_FLUSH) {
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ret = scsi_setup_flush_cmnd(sdp, rq);
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goto out;
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} else if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
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ret = scsi_setup_blk_pc_cmnd(sdp, rq);
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goto out;
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} else if (rq->cmd_type != REQ_TYPE_FS) {
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ret = BLKPREP_KILL;
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goto out;
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}
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ret = scsi_setup_fs_cmnd(sdp, rq);
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if (ret != BLKPREP_OK)
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@ -903,11 +893,10 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
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* is used for a killable error condition */
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ret = BLKPREP_KILL;
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SCSI_LOG_HLQUEUE(1, scmd_printk(KERN_INFO, SCpnt,
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"sd_prep_fn: block=%llu, "
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"count=%d\n",
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(unsigned long long)block,
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this_count));
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SCSI_LOG_HLQUEUE(1,
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scmd_printk(KERN_INFO, SCpnt,
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"%s: block=%llu, count=%d\n",
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__func__, (unsigned long long)block, this_count));
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if (!sdp || !scsi_device_online(sdp) ||
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block + blk_rq_sectors(rq) > get_capacity(disk)) {
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@ -1127,7 +1116,7 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
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*/
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ret = BLKPREP_OK;
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out:
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return scsi_prep_return(q, rq, ret);
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return ret;
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}
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/**
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@ -2878,9 +2867,6 @@ static void sd_probe_async(void *data, async_cookie_t cookie)
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sd_revalidate_disk(gd);
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blk_queue_prep_rq(sdp->request_queue, sd_prep_fn);
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blk_queue_unprep_rq(sdp->request_queue, sd_unprep_fn);
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gd->driverfs_dev = &sdp->sdev_gendev;
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gd->flags = GENHD_FL_EXT_DEVT;
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if (sdp->removable) {
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@ -3028,8 +3014,6 @@ static int sd_remove(struct device *dev)
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async_synchronize_full_domain(&scsi_sd_pm_domain);
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async_synchronize_full_domain(&scsi_sd_probe_domain);
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blk_queue_prep_rq(sdkp->device->request_queue, scsi_prep_fn);
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blk_queue_unprep_rq(sdkp->device->request_queue, NULL);
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device_del(&sdkp->dev);
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del_gendisk(sdkp->disk);
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sd_shutdown(dev);
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@ -79,6 +79,7 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_WORM);
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static DEFINE_MUTEX(sr_mutex);
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static int sr_probe(struct device *);
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static int sr_remove(struct device *);
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static int sr_init_command(struct scsi_cmnd *SCpnt);
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static int sr_done(struct scsi_cmnd *);
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static int sr_runtime_suspend(struct device *dev);
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@ -94,6 +95,7 @@ static struct scsi_driver sr_template = {
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.remove = sr_remove,
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.pm = &sr_pm_ops,
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},
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.init_command = sr_init_command,
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.done = sr_done,
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};
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@ -378,21 +380,14 @@ static int sr_done(struct scsi_cmnd *SCpnt)
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return good_bytes;
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}
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static int sr_prep_fn(struct request_queue *q, struct request *rq)
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static int sr_init_command(struct scsi_cmnd *SCpnt)
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{
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int block = 0, this_count, s_size;
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struct scsi_cd *cd;
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struct scsi_cmnd *SCpnt;
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struct scsi_device *sdp = q->queuedata;
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struct request *rq = SCpnt->request;
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struct scsi_device *sdp = SCpnt->device;
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int ret;
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if (rq->cmd_type == REQ_TYPE_BLOCK_PC) {
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ret = scsi_setup_blk_pc_cmnd(sdp, rq);
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goto out;
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} else if (rq->cmd_type != REQ_TYPE_FS) {
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ret = BLKPREP_KILL;
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goto out;
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}
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ret = scsi_setup_fs_cmnd(sdp, rq);
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if (ret != BLKPREP_OK)
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goto out;
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@ -517,7 +512,7 @@ static int sr_prep_fn(struct request_queue *q, struct request *rq)
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*/
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ret = BLKPREP_OK;
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out:
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return scsi_prep_return(q, rq, ret);
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return ret;
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}
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static int sr_block_open(struct block_device *bdev, fmode_t mode)
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@ -718,7 +713,6 @@ static int sr_probe(struct device *dev)
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/* FIXME: need to handle a get_capabilities failure properly ?? */
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get_capabilities(cd);
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blk_queue_prep_rq(sdev->request_queue, sr_prep_fn);
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sr_vendor_init(cd);
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disk->driverfs_dev = &sdev->sdev_gendev;
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@ -993,7 +987,6 @@ static int sr_remove(struct device *dev)
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scsi_autopm_get_device(cd->device);
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blk_queue_prep_rq(cd->device->request_queue, scsi_prep_fn);
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del_gendisk(cd->disk);
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mutex_lock(&sr_ref_mutex);
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@ -4,17 +4,17 @@
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#include <linux/device.h>
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struct module;
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struct request;
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struct scsi_cmnd;
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struct scsi_device;
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struct request;
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struct request_queue;
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struct scsi_driver {
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struct module *owner;
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struct device_driver gendrv;
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void (*rescan)(struct device *);
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int (*init_command)(struct scsi_cmnd *);
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void (*uninit_command)(struct scsi_cmnd *);
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int (*done)(struct scsi_cmnd *);
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int (*eh_action)(struct scsi_cmnd *, int);
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};
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@ -31,8 +31,5 @@ extern int scsi_register_interface(struct class_interface *);
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int scsi_setup_blk_pc_cmnd(struct scsi_device *sdev, struct request *req);
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int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req);
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int scsi_prep_state_check(struct scsi_device *sdev, struct request *req);
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int scsi_prep_return(struct request_queue *q, struct request *req, int ret);
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int scsi_prep_fn(struct request_queue *, struct request *);
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#endif /* _SCSI_SCSI_DRIVER_H */
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