1 files changed, 91 insertions, 364 deletions

diff --git a/drivers/scsi/scsi_transport_fc.c b/drivers/scsi/scsi_transport_fc.c
index 0f3a3869524b..03577bde6ac5 100644
--- a/drivers/scsi/scsi_transport_fc.c
+++ b/drivers/scsi/scsi_transport_fc.c
@@ -30,6 +30,7 @@
 #include <linux/slab.h>
 #include <linux/delay.h>
 #include <linux/kernel.h>
+#include <linux/bsg-lib.h>
 #include <scsi/scsi_device.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_transport.h>
@@ -2592,7 +2593,7 @@ fc_rport_final_delete(struct work_struct *work)
 
 
 /**
- * fc_rport_create - allocates and creates a remote FC port.
+ * fc_remote_port_create - allocates and creates a remote FC port.
  * @shost:	scsi host the remote port is connected to.
  * @channel:	Channel on shost port connected to.
  * @ids:	The world wide names, fc address, and FC4 port
@@ -2605,8 +2606,8 @@ fc_rport_final_delete(struct work_struct *work)
  *	This routine assumes no locks are held on entry.
  */
 static struct fc_rport *
-fc_rport_create(struct Scsi_Host *shost, int channel,
-	struct fc_rport_identifiers  *ids)
+fc_remote_port_create(struct Scsi_Host *shost, int channel,
+		      struct fc_rport_identifiers  *ids)
 {
 	struct fc_host_attrs *fc_host = shost_to_fc_host(shost);
 	struct fc_internal *fci = to_fc_internal(shost->transportt);
@@ -2914,7 +2915,7 @@ fc_remote_port_add(struct Scsi_Host *shost, int channel,
 	spin_unlock_irqrestore(shost->host_lock, flags);
 
 	/* No consistent binding found - create new remote port entry */
-	rport = fc_rport_create(shost, channel, ids);
+	rport = fc_remote_port_create(shost, channel, ids);
 
 	return rport;
 }
@@ -3554,81 +3555,6 @@ fc_vport_sched_delete(struct work_struct *work)
  * BSG support
  */
 
-
-/**
- * fc_destroy_bsgjob - routine to teardown/delete a fc bsg job
- * @job:	fc_bsg_job that is to be torn down
- */
-static void
-fc_destroy_bsgjob(struct fc_bsg_job *job)
-{
-	unsigned long flags;
-
-	spin_lock_irqsave(&job->job_lock, flags);
-	if (job->ref_cnt) {
-		spin_unlock_irqrestore(&job->job_lock, flags);
-		return;
-	}
-	spin_unlock_irqrestore(&job->job_lock, flags);
-
-	put_device(job->dev);	/* release reference for the request */
-
-	kfree(job->request_payload.sg_list);
-	kfree(job->reply_payload.sg_list);
-	kfree(job);
-}
-
-/**
- * fc_bsg_jobdone - completion routine for bsg requests that the LLD has
- *                  completed
- * @job:	fc_bsg_job that is complete
- */
-static void
-fc_bsg_jobdone(struct fc_bsg_job *job)
-{
-	struct request *req = job->req;
-	struct request *rsp = req->next_rq;
-	int err;
-
-	err = job->req->errors = job->reply->result;
-
-	if (err < 0)
-		/* we're only returning the result field in the reply */
-		job->req->sense_len = sizeof(uint32_t);
-	else
-		job->req->sense_len = job->reply_len;
-
-	/* we assume all request payload was transferred, residual == 0 */
-	req->resid_len = 0;
-
-	if (rsp) {
-		WARN_ON(job->reply->reply_payload_rcv_len > rsp->resid_len);
-
-		/* set reply (bidi) residual */
-		rsp->resid_len -= min(job->reply->reply_payload_rcv_len,
-				      rsp->resid_len);
-	}
-	blk_complete_request(req);
-}
-
-/**
- * fc_bsg_softirq_done - softirq done routine for destroying the bsg requests
- * @rq:        BSG request that holds the job to be destroyed
- */
-static void fc_bsg_softirq_done(struct request *rq)
-{
-	struct fc_bsg_job *job = rq->special;
-	unsigned long flags;
-
-	spin_lock_irqsave(&job->job_lock, flags);
-	job->state_flags |= FC_RQST_STATE_DONE;
-	job->ref_cnt--;
-	spin_unlock_irqrestore(&job->job_lock, flags);
-
-	blk_end_request_all(rq, rq->errors);
-	fc_destroy_bsgjob(job);
-}
-
 /**
  * fc_bsg_job_timeout - handler for when a bsg request timesout
  * @req:	request that timed out
@@ -3636,27 +3562,22 @@ static void fc_bsg_softirq_done(struct request *rq)
 static enum blk_eh_timer_return
 fc_bsg_job_timeout(struct request *req)
 {
-	struct fc_bsg_job *job = (void *) req->special;
-	struct Scsi_Host *shost = job->shost;
+	struct bsg_job *job = (void *) req->special;
+	struct Scsi_Host *shost = fc_bsg_to_shost(job);
+	struct fc_rport *rport = fc_bsg_to_rport(job);
 	struct fc_internal *i = to_fc_internal(shost->transportt);
-	unsigned long flags;
-	int err = 0, done = 0;
+	int err = 0, inflight = 0;
 
-	if (job->rport && job->rport->port_state == FC_PORTSTATE_BLOCKED)
+	if (rport && rport->port_state == FC_PORTSTATE_BLOCKED)
 		return BLK_EH_RESET_TIMER;
 
-	spin_lock_irqsave(&job->job_lock, flags);
-	if (job->state_flags & FC_RQST_STATE_DONE)
-		done = 1;
-	else
-		job->ref_cnt++;
-	spin_unlock_irqrestore(&job->job_lock, flags);
+	inflight = bsg_job_get(job);
 
-	if (!done && i->f->bsg_timeout) {
+	if (inflight && i->f->bsg_timeout) {
 		/* call LLDD to abort the i/o as it has timed out */
 		err = i->f->bsg_timeout(job);
 		if (err == -EAGAIN) {
-			job->ref_cnt--;
+			bsg_job_put(job);
 			return BLK_EH_RESET_TIMER;
 		} else if (err)
 			printk(KERN_ERR "ERROR: FC BSG request timeout - LLD "
@@ -3664,126 +3585,33 @@ fc_bsg_job_timeout(struct request *req)
 	}
 
 	/* the blk_end_sync_io() doesn't check the error */
-	if (done)
+	if (!inflight)
 		return BLK_EH_NOT_HANDLED;
 	else
 		return BLK_EH_HANDLED;
 }
 
-static int
-fc_bsg_map_buffer(struct fc_bsg_buffer *buf, struct request *req)
-{
-	size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
-
-	BUG_ON(!req->nr_phys_segments);
-
-	buf->sg_list = kzalloc(sz, GFP_KERNEL);
-	if (!buf->sg_list)
-		return -ENOMEM;
-	sg_init_table(buf->sg_list, req->nr_phys_segments);
-	buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
-	buf->payload_len = blk_rq_bytes(req);
-	return 0;
-}
-
-
-/**
- * fc_req_to_bsgjob - Allocate/create the fc_bsg_job structure for the
- *                   bsg request
- * @shost:	SCSI Host corresponding to the bsg object
- * @rport:	(optional) FC Remote Port corresponding to the bsg object
- * @req:	BSG request that needs a job structure
- */
-static int
-fc_req_to_bsgjob(struct Scsi_Host *shost, struct fc_rport *rport,
-	struct request *req)
-{
-	struct fc_internal *i = to_fc_internal(shost->transportt);
-	struct request *rsp = req->next_rq;
-	struct fc_bsg_job *job;
-	int ret;
-
-	BUG_ON(req->special);
-
-	job = kzalloc(sizeof(struct fc_bsg_job) + i->f->dd_bsg_size,
-			GFP_KERNEL);
-	if (!job)
-		return -ENOMEM;
-
-	/*
-	 * Note: this is a bit silly.
-	 * The request gets formatted as a SGIO v4 ioctl request, which
-	 * then gets reformatted as a blk request, which then gets
-	 * reformatted as a fc bsg request. And on completion, we have
-	 * to wrap return results such that SGIO v4 thinks it was a scsi
-	 * status.  I hope this was all worth it.
-	 */
-
-	req->special = job;
-	job->shost = shost;
-	job->rport = rport;
-	job->req = req;
-	if (i->f->dd_bsg_size)
-		job->dd_data = (void *)&job[1];
-	spin_lock_init(&job->job_lock);
-	job->request = (struct fc_bsg_request *)req->cmd;
-	job->request_len = req->cmd_len;
-	job->reply = req->sense;
-	job->reply_len = SCSI_SENSE_BUFFERSIZE;	/* Size of sense buffer
-						 * allocated */
-	if (req->bio) {
-		ret = fc_bsg_map_buffer(&job->request_payload, req);
-		if (ret)
-			goto failjob_rls_job;
-	}
-	if (rsp && rsp->bio) {
-		ret = fc_bsg_map_buffer(&job->reply_payload, rsp);
-		if (ret)
-			goto failjob_rls_rqst_payload;
-	}
-	job->job_done = fc_bsg_jobdone;
-	if (rport)
-		job->dev = &rport->dev;
-	else
-		job->dev = &shost->shost_gendev;
-	get_device(job->dev);		/* take a reference for the request */
-
-	job->ref_cnt = 1;
-
-	return 0;
-
-
-failjob_rls_rqst_payload:
-	kfree(job->request_payload.sg_list);
-failjob_rls_job:
-	kfree(job);
-	return -ENOMEM;
-}
-
-
-enum fc_dispatch_result {
-	FC_DISPATCH_BREAK,	/* on return, q is locked, break from q loop */
-	FC_DISPATCH_LOCKED,	/* on return, q is locked, continue on */
-	FC_DISPATCH_UNLOCKED,	/* on return, q is unlocked, continue on */
-};
-
-
 /**
  * fc_bsg_host_dispatch - process fc host bsg requests and dispatch to LLDD
- * @q:		fc host request queue
  * @shost:	scsi host rport attached to
  * @job:	bsg job to be processed
  */
-static enum fc_dispatch_result
-fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
-			 struct fc_bsg_job *job)
+static int fc_bsg_host_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
 {
 	struct fc_internal *i = to_fc_internal(shost->transportt);
+	struct fc_bsg_request *bsg_request = job->request;
+	struct fc_bsg_reply *bsg_reply = job->reply;
 	int cmdlen = sizeof(uint32_t);	/* start with length of msgcode */
 	int ret;
 
+	/* check if we really have all the request data needed */
+	if (job->request_len < cmdlen) {
+		ret = -ENOMSG;
+		goto fail_host_msg;
+	}
+
 	/* Validate the host command */
-	switch (job->request->msgcode) {
+	switch (bsg_request->msgcode) {
 	case FC_BSG_HST_ADD_RPORT:
 		cmdlen += sizeof(struct fc_bsg_host_add_rport);
 		break;
@@ -3815,7 +3643,7 @@ fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
 	case FC_BSG_HST_VENDOR:
 		cmdlen += sizeof(struct fc_bsg_host_vendor);
 		if ((shost->hostt->vendor_id == 0L) ||
-		    (job->request->rqst_data.h_vendor.vendor_id !=
+		    (bsg_request->rqst_data.h_vendor.vendor_id !=
 			shost->hostt->vendor_id)) {
 			ret = -ESRCH;
 			goto fail_host_msg;
@@ -3827,24 +3655,19 @@ fc_bsg_host_dispatch(struct request_queue *q, struct Scsi_Host *shost,
 		goto fail_host_msg;
 	}
 
-	/* check if we really have all the request data needed */
-	if (job->request_len < cmdlen) {
-		ret = -ENOMSG;
-		goto fail_host_msg;
-	}
-
 	ret = i->f->bsg_request(job);
 	if (!ret)
-		return FC_DISPATCH_UNLOCKED;
+		return 0;
 
 fail_host_msg:
 	/* return the errno failure code as the only status */
 	BUG_ON(job->reply_len < sizeof(uint32_t));
-	job->reply->reply_payload_rcv_len = 0;
-	job->reply->result = ret;
+	bsg_reply->reply_payload_rcv_len = 0;
+	bsg_reply->result = ret;
 	job->reply_len = sizeof(uint32_t);
-	fc_bsg_jobdone(job);
-	return FC_DISPATCH_UNLOCKED;
+	bsg_job_done(job, bsg_reply->result,
+		       bsg_reply->reply_payload_rcv_len);
+	return 0;
 }
 
 
@@ -3855,34 +3678,38 @@ fail_host_msg:
 static void
 fc_bsg_goose_queue(struct fc_rport *rport)
 {
-	if (!rport->rqst_q)
+	struct request_queue *q = rport->rqst_q;
+	unsigned long flags;
+
+	if (!q)
 		return;
 
-	/*
-	 * This get/put dance makes no sense
-	 */
-	get_device(&rport->dev);
-	blk_run_queue_async(rport->rqst_q);
-	put_device(&rport->dev);
+	spin_lock_irqsave(q->queue_lock, flags);
+	blk_run_queue_async(q);
+	spin_unlock_irqrestore(q->queue_lock, flags);
 }
 
 /**
  * fc_bsg_rport_dispatch - process rport bsg requests and dispatch to LLDD
- * @q:		rport request queue
  * @shost:	scsi host rport attached to
- * @rport:	rport request destined to
  * @job:	bsg job to be processed
  */
-static enum fc_dispatch_result
-fc_bsg_rport_dispatch(struct request_queue *q, struct Scsi_Host *shost,
-			 struct fc_rport *rport, struct fc_bsg_job *job)
+static int fc_bsg_rport_dispatch(struct Scsi_Host *shost, struct bsg_job *job)
 {
 	struct fc_internal *i = to_fc_internal(shost->transportt);
+	struct fc_bsg_request *bsg_request = job->request;
+	struct fc_bsg_reply *bsg_reply = job->reply;
 	int cmdlen = sizeof(uint32_t);	/* start with length of msgcode */
 	int ret;
 
+	/* check if we really have all the request data needed */
+	if (job->request_len < cmdlen) {
+		ret = -ENOMSG;
+		goto fail_rport_msg;
+	}
+
 	/* Validate the rport command */
-	switch (job->request->msgcode) {
+	switch (bsg_request->msgcode) {
 	case FC_BSG_RPT_ELS:
 		cmdlen += sizeof(struct fc_bsg_rport_els);
 		goto check_bidi;
@@ -3902,133 +3729,31 @@ check_bidi:
 		goto fail_rport_msg;
 	}
 
-	/* check if we really have all the request data needed */
-	if (job->request_len < cmdlen) {
-		ret = -ENOMSG;
-		goto fail_rport_msg;
-	}
-
 	ret = i->f->bsg_request(job);
 	if (!ret)
-		return FC_DISPATCH_UNLOCKED;
+		return 0;
 
 fail_rport_msg:
 	/* return the errno failure code as the only status */
 	BUG_ON(job->reply_len < sizeof(uint32_t));
-	job->reply->reply_payload_rcv_len = 0;
-	job->reply->result = ret;
+	bsg_reply->reply_payload_rcv_len = 0;
+	bsg_reply->result = ret;
 	job->reply_len = sizeof(uint32_t);
-	fc_bsg_jobdone(job);
-	return FC_DISPATCH_UNLOCKED;
-}
-
-
-/**
- * fc_bsg_request_handler - generic handler for bsg requests
- * @q:		request queue to manage
- * @shost:	Scsi_Host related to the bsg object
- * @rport:	FC remote port related to the bsg object (optional)
- * @dev:	device structure for bsg object
- */
-static void
-fc_bsg_request_handler(struct request_queue *q, struct Scsi_Host *shost,
-		       struct fc_rport *rport, struct device *dev)
-{
-	struct request *req;
-	struct fc_bsg_job *job;
-	enum fc_dispatch_result ret;
-
-	if (!get_device(dev))
-		return;
-
-	while (1) {
-		if (rport && (rport->port_state == FC_PORTSTATE_BLOCKED) &&
-		    !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
-			break;
-
-		req = blk_fetch_request(q);
-		if (!req)
-			break;
-
-		if (rport && (rport->port_state != FC_PORTSTATE_ONLINE)) {
-			req->errors = -ENXIO;
-			spin_unlock_irq(q->queue_lock);
-			blk_end_request_all(req, -ENXIO);
-			spin_lock_irq(q->queue_lock);
-			continue;
-		}
-
-		spin_unlock_irq(q->queue_lock);
-
-		ret = fc_req_to_bsgjob(shost, rport, req);
-		if (ret) {
-			req->errors = ret;
-			blk_end_request_all(req, ret);
-			spin_lock_irq(q->queue_lock);
-			continue;
-		}
-
-		job = req->special;
-
-		/* check if we have the msgcode value at least */
-		if (job->request_len < sizeof(uint32_t)) {
-			BUG_ON(job->reply_len < sizeof(uint32_t));
-			job->reply->reply_payload_rcv_len = 0;
-			job->reply->result = -ENOMSG;
-			job->reply_len = sizeof(uint32_t);
-			fc_bsg_jobdone(job);
-			spin_lock_irq(q->queue_lock);
-			continue;
-		}
-
-		/* the dispatch routines will unlock the queue_lock */
-		if (rport)
-			ret = fc_bsg_rport_dispatch(q, shost, rport, job);
-		else
-			ret = fc_bsg_host_dispatch(q, shost, job);
-
-		/* did dispatcher hit state that can't process any more */
-		if (ret == FC_DISPATCH_BREAK)
-			break;
-
-		/* did dispatcher had released the lock */
-		if (ret == FC_DISPATCH_UNLOCKED)
-			spin_lock_irq(q->queue_lock);
-	}
-
-	spin_unlock_irq(q->queue_lock);
-	put_device(dev);
-	spin_lock_irq(q->queue_lock);
-}
-
-
-/**
- * fc_bsg_host_handler - handler for bsg requests for a fc host
- * @q:		fc host request queue
- */
-static void
-fc_bsg_host_handler(struct request_queue *q)
-{
-	struct Scsi_Host *shost = q->queuedata;
-
-	fc_bsg_request_handler(q, shost, NULL, &shost->shost_gendev);
+	bsg_job_done(job, bsg_reply->result,
+		       bsg_reply->reply_payload_rcv_len);
+	return 0;
 }
 
-
-/**
- * fc_bsg_rport_handler - handler for bsg requests for a fc rport
- * @q:		rport request queue
- */
-static void
-fc_bsg_rport_handler(struct request_queue *q)
+static int fc_bsg_dispatch(struct bsg_job *job)
 {
-	struct fc_rport *rport = q->queuedata;
-	struct Scsi_Host *shost = rport_to_shost(rport);
+	struct Scsi_Host *shost = fc_bsg_to_shost(job);
 
-	fc_bsg_request_handler(q, shost, rport, &rport->dev);
+	if (scsi_is_fc_rport(job->dev))
+		return fc_bsg_rport_dispatch(shost, job);
+	else
+		return fc_bsg_host_dispatch(shost, job);
 }
 
-
 /**
  * fc_bsg_hostadd - Create and add the bsg hooks so we can receive requests
  * @shost:	shost for fc_host
@@ -4051,33 +3776,42 @@ fc_bsg_hostadd(struct Scsi_Host *shost, struct fc_host_attrs *fc_host)
 	snprintf(bsg_name, sizeof(bsg_name),
 		 "fc_host%d", shost->host_no);
 
-	q = __scsi_alloc_queue(shost, fc_bsg_host_handler);
+	q = __scsi_alloc_queue(shost, bsg_request_fn);
 	if (!q) {
-		printk(KERN_ERR "fc_host%d: bsg interface failed to "
-				"initialize - no request queue\n",
-				 shost->host_no);
+		dev_err(dev,
+			"fc_host%d: bsg interface failed to initialize - no request queue\n",
+			shost->host_no);
 		return -ENOMEM;
 	}
 
-	q->queuedata = shost;
-	queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
-	blk_queue_softirq_done(q, fc_bsg_softirq_done);
-	blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
-	blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
-
-	err = bsg_register_queue(q, dev, bsg_name, NULL);
+	err = bsg_setup_queue(dev, q, bsg_name, fc_bsg_dispatch,
+				 i->f->dd_bsg_size);
 	if (err) {
-		printk(KERN_ERR "fc_host%d: bsg interface failed to "
-				"initialize - register queue\n",
-				shost->host_no);
+		dev_err(dev,
+			"fc_host%d: bsg interface failed to initialize - setup queue\n",
+			shost->host_no);
 		blk_cleanup_queue(q);
 		return err;
 	}
-
+	blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
+	blk_queue_rq_timeout(q, FC_DEFAULT_BSG_TIMEOUT);
 	fc_host->rqst_q = q;
 	return 0;
 }
 
+static int fc_bsg_rport_prep(struct request_queue *q, struct request *req)
+{
+	struct fc_rport *rport = dev_to_rport(q->queuedata);
+
+	if (rport->port_state == FC_PORTSTATE_BLOCKED &&
+	    !(rport->flags & FC_RPORT_FAST_FAIL_TIMEDOUT))
+		return BLKPREP_DEFER;
+
+	if (rport->port_state != FC_PORTSTATE_ONLINE)
+		return BLKPREP_KILL;
+
+	return BLKPREP_OK;
+}
 
 /**
  * fc_bsg_rportadd - Create and add the bsg hooks so we can receive requests
@@ -4097,29 +3831,22 @@ fc_bsg_rportadd(struct Scsi_Host *shost, struct fc_rport *rport)
 	if (!i->f->bsg_request)
 		return -ENOTSUPP;
 
-	q = __scsi_alloc_queue(shost, fc_bsg_rport_handler);
+	q = __scsi_alloc_queue(shost, bsg_request_fn);
 	if (!q) {
-		printk(KERN_ERR "%s: bsg interface failed to "
-				"initialize - no request queue\n",
-				 dev->kobj.name);
+		dev_err(dev, "bsg interface failed to initialize - no request queue\n");
 		return -ENOMEM;
 	}
 
-	q->queuedata = rport;
-	queue_flag_set_unlocked(QUEUE_FLAG_BIDI, q);
-	blk_queue_softirq_done(q, fc_bsg_softirq_done);
-	blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
-	blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
-
-	err = bsg_register_queue(q, dev, NULL, NULL);
+	err = bsg_setup_queue(dev, q, NULL, fc_bsg_dispatch, i->f->dd_bsg_size);
 	if (err) {
-		printk(KERN_ERR "%s: bsg interface failed to "
-				"initialize - register queue\n",
-				 dev->kobj.name);
+		dev_err(dev, "failed to setup bsg queue\n");
 		blk_cleanup_queue(q);
 		return err;
 	}
 
+	blk_queue_prep_rq(q, fc_bsg_rport_prep);
+	blk_queue_rq_timed_out(q, fc_bsg_job_timeout);
+	blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
 	rport->rqst_q = q;
 	return 0;
 }