Merge branch 'for-4.16/block' of git://git.kernel.dk/linux-block

Pull block updates from Jens Axboe:
 "This is the main pull request for block IO related changes for the
  4.16 kernel. Nothing major in this pull request, but a good amount of
  improvements and fixes all over the map. This contains:

   - BFQ improvements, fixes, and cleanups from Angelo, Chiara, and
     Paolo.

   - Support for SMR zones for deadline and mq-deadline from Damien and
     Christoph.

   - Set of fixes for bcache by way of Michael Lyle, including fixes
     from himself, Kent, Rui, Tang, and Coly.

   - Series from Matias for lightnvm with fixes from Hans Holmberg,
     Javier, and Matias. Mostly centered around pblk, and the removing
     rrpc 1.2 in preparation for supporting 2.0.

   - A couple of NVMe pull requests from Christoph. Nothing major in
     here, just fixes and cleanups, and support for command tracing from
     Johannes.

   - Support for blk-throttle for tracking reads and writes separately.
     From Joseph Qi. A few cleanups/fixes also for blk-throttle from
     Weiping.

   - Series from Mike Snitzer that enables dm to register its queue more
     logically, something that's alwways been problematic on dm since
     it's a stacked device.

   - Series from Ming cleaning up some of the bio accessor use, in
     preparation for supporting multipage bvecs.

   - Various fixes from Ming closing up holes around queue mapping and
     quiescing.

   - BSD partition fix from Richard Narron, fixing a problem where we
     can't mount newer (10/11) FreeBSD partitions.

   - Series from Tejun reworking blk-mq timeout handling. The previous
     scheme relied on atomic bits, but it had races where we would think
     a request had timed out if it to reused at the wrong time.

   - null_blk now supports faking timeouts, to enable us to better
     exercise and test that functionality separately. From me.

   - Kill the separate atomic poll bit in the request struct. After
     this, we don't use the atomic bits on blk-mq anymore at all. From
     me.

   - sgl_alloc/free helpers from Bart.

   - Heavily contended tag case scalability improvement from me.

   - Various little fixes and cleanups from Arnd, Bart, Corentin,
     Douglas, Eryu, Goldwyn, and myself"

* 'for-4.16/block' of git://git.kernel.dk/linux-block: (186 commits)
  block: remove smart1,2.h
  nvme: add tracepoint for nvme_complete_rq
  nvme: add tracepoint for nvme_setup_cmd
  nvme-pci: introduce RECONNECTING state to mark initializing procedure
  nvme-rdma: remove redundant boolean for inline_data
  nvme: don't free uuid pointer before printing it
  nvme-pci: Suspend queues after deleting them
  bsg: use pr_debug instead of hand crafted macros
  blk-mq-debugfs: don't allow write on attributes with seq_operations set
  nvme-pci: Fix queue double allocations
  block: Set BIO_TRACE_COMPLETION on new bio during split
  blk-throttle: use queue_is_rq_based
  block: Remove kblockd_schedule_delayed_work{,_on}()
  blk-mq: Avoid that blk_mq_delay_run_hw_queue() introduces unintended delays
  blk-mq: Rename blk_mq_request_direct_issue() into blk_mq_request_issue_directly()
  lib/scatterlist: Fix chaining support in sgl_alloc_order()
  blk-throttle: track read and write request individually
  block: add bdev_read_only() checks to common helpers
  block: fail op_is_write() requests to read-only partitions
  blk-throttle: export io_serviced_recursive, io_service_bytes_recursive
  ...

1 files changed, 5 insertions, 55 deletions

diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index 5fd86039e353..9b39a6cb1935 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -1697,31 +1697,12 @@ static int
 nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
 {
 	struct scatterlist *sg;
-	struct page *page;
 	unsigned int nent;
-	u32 page_len, length;
-	int i = 0;
 
-	length = fod->req.transfer_len;
-	nent = DIV_ROUND_UP(length, PAGE_SIZE);
-	sg = kmalloc_array(nent, sizeof(struct scatterlist), GFP_KERNEL);
+	sg = sgl_alloc(fod->req.transfer_len, GFP_KERNEL, &nent);
 	if (!sg)
 		goto out;
 
-	sg_init_table(sg, nent);
-
-	while (length) {
-		page_len = min_t(u32, length, PAGE_SIZE);
-
-		page = alloc_page(GFP_KERNEL);
-		if (!page)
-			goto out_free_pages;
-
-		sg_set_page(&sg[i], page, page_len, 0);
-		length -= page_len;
-		i++;
-	}
-
 	fod->data_sg = sg;
 	fod->data_sg_cnt = nent;
 	fod->data_sg_cnt = fc_dma_map_sg(fod->tgtport->dev, sg, nent,
@@ -1731,14 +1712,6 @@ nvmet_fc_alloc_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
 
 	return 0;
 
-out_free_pages:
-	while (i > 0) {
-		i--;
-		__free_page(sg_page(&sg[i]));
-	}
-	kfree(sg);
-	fod->data_sg = NULL;
-	fod->data_sg_cnt = 0;
 out:
 	return NVME_SC_INTERNAL;
 }
@@ -1746,18 +1719,13 @@ out:
 static void
 nvmet_fc_free_tgt_pgs(struct nvmet_fc_fcp_iod *fod)
 {
-	struct scatterlist *sg;
-	int count;
-
 	if (!fod->data_sg || !fod->data_sg_cnt)
 		return;
 
 	fc_dma_unmap_sg(fod->tgtport->dev, fod->data_sg, fod->data_sg_cnt,
 				((fod->io_dir == NVMET_FCP_WRITE) ?
 					DMA_FROM_DEVICE : DMA_TO_DEVICE));
-	for_each_sg(fod->data_sg, sg, fod->data_sg_cnt, count)
-		__free_page(sg_page(sg));
-	kfree(fod->data_sg);
+	sgl_free(fod->data_sg);
 	fod->data_sg = NULL;
 	fod->data_sg_cnt = 0;
 }
@@ -2522,14 +2490,8 @@ nvmet_fc_add_port(struct nvmet_port *port)
 	list_for_each_entry(tgtport, &nvmet_fc_target_list, tgt_list) {
 		if ((tgtport->fc_target_port.node_name == traddr.nn) &&
 		    (tgtport->fc_target_port.port_name == traddr.pn)) {
-			/* a FC port can only be 1 nvmet port id */
-			if (!tgtport->port) {
-				tgtport->port = port;
-				port->priv = tgtport;
-				nvmet_fc_tgtport_get(tgtport);
-				ret = 0;
-			} else
-				ret = -EALREADY;
+			tgtport->port = port;
+			ret = 0;
 			break;
 		}
 	}
@@ -2540,19 +2502,7 @@ nvmet_fc_add_port(struct nvmet_port *port)
 static void
 nvmet_fc_remove_port(struct nvmet_port *port)
 {
-	struct nvmet_fc_tgtport *tgtport = port->priv;
-	unsigned long flags;
-	bool matched = false;
-
-	spin_lock_irqsave(&nvmet_fc_tgtlock, flags);
-	if (tgtport->port == port) {
-		matched = true;
-		tgtport->port = NULL;
-	}
-	spin_unlock_irqrestore(&nvmet_fc_tgtlock, flags);
-
-	if (matched)
-		nvmet_fc_tgtport_put(tgtport);
+	/* nothing to do */
 }
 
 static struct nvmet_fabrics_ops nvmet_fc_tgt_fcp_ops = {