[PATCHBOMB] nvme fixes for 5.1

[PATCHBOMB] nvme fixes for 5.1

[Christoph Hellwig]

Hi Jens,

git.infradead.org seems to have some hickups at the moment, so
this bunch of nvme fixes will come in form of a patchbomb instead.

Most important is quirking Write Zeroes on qemu, as the implementation
there is buggy and could lead to ext4 data corruption.  Except for
that we have various other fixes all over the place.

[PATCH 01/17] nvme: add get-feature to admin cmds tracer

[Christoph Hellwig]

From: Max Gurtovoy <maxg@mellanox.com>

This will print get-feature cmd in more informative way. For example,
run "nvme get-feature /dev/nvme0 -n 1 -f 0x9 -c 10" will trace:

 nvme-3907  [008] ....  1763.635054: nvme_setup_cmd: nvme0: qid=0, cmdid=6, nsid=1, flags=0x0, meta=0x0, cmd=(nvme_admin_get_features fid=0x9 sel=0x0 cdw11=0xa)
<idle>-0     [001] d.h.  1763.635112: nvme_sq: nvme0: qid=0, head=27, tail=27
<idle>-0     [008] ..s.  1763.635121: nvme_complete_rq: nvme0: qid=0, cmdid=6, res=10, retries=0, flags=0x2, status=0

Signed-off-by: Max Gurtovoy <maxg at mellanox.com>
Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
Reviewed-by: Johannes Thumshirn <jthumshirn at suse.de>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/trace.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/nvme/host/trace.c b/drivers/nvme/host/trace.c
index 58456de78bb2..5f24ea7a28eb 100644
--- a/drivers/nvme/host/trace.c
+++ b/drivers/nvme/host/trace.c
@@ -50,7 +50,19 @@ static const char *nvme_trace_admin_identify(struct trace_seq *p, u8 *cdw10)
 	return ret;
 }
 
+static const char *nvme_trace_admin_get_features(struct trace_seq *p,
+						 u8 *cdw10)
+{
+	const char *ret = trace_seq_buffer_ptr(p);
+	u8 fid = cdw10[0];
+	u8 sel = cdw10[1] & 0x7;
+	u32 cdw11 = get_unaligned_le32(cdw10 + 4);
+
+	trace_seq_printf(p, "fid=0x%x sel=0x%x cdw11=0x%x", fid, sel, cdw11);
+	trace_seq_putc(p, 0);
 
+	return ret;
+}
 
 static const char *nvme_trace_read_write(struct trace_seq *p, u8 *cdw10)
 {
@@ -101,6 +113,8 @@ const char *nvme_trace_parse_admin_cmd(struct trace_seq *p,
 		return nvme_trace_create_cq(p, cdw10);
 	case nvme_admin_identify:
 		return nvme_trace_admin_identify(p, cdw10);
+	case nvme_admin_get_features:
+		return nvme_trace_admin_get_features(p, cdw10);
 	default:
 		return nvme_trace_common(p, cdw10);
 	}
-- 
2.20.1

[PATCH 02/17] nvme: don't warn on block content change effects

[Christoph Hellwig]

From: Keith Busch <keith.busch@intel.com>

A write or flush IO passthrough command is expected to change the
logical block content, so don't warn on these as no additional handling
is necessary.

Signed-off-by: Keith Busch <keith.busch at intel.com>
Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 07bf2bff3a76..dc1641247b17 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1250,7 +1250,7 @@ static u32 nvme_passthru_start(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
 	if (ns) {
 		if (ctrl->effects)
 			effects = le32_to_cpu(ctrl->effects->iocs[opcode]);
-		if (effects & ~NVME_CMD_EFFECTS_CSUPP)
+		if (effects & ~(NVME_CMD_EFFECTS_CSUPP | NVME_CMD_EFFECTS_LBCC))
 			dev_warn(ctrl->device,
 				 "IO command:%02x has unhandled effects:%08x\n",
 				 opcode, effects);
-- 
2.20.1

[PATCH 03/17] nvme-trace: fix cdw10 buffer overrun

[Christoph Hellwig]

From: Keith Busch <keith.busch@intel.com>

The field is defined to be a 24 byte array, we don't need to multiply
the sizeof() that field by the number of dwords it covers.

Signed-off-by: Keith Busch <keith.busch at intel.com>
Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/trace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvme/host/trace.h b/drivers/nvme/host/trace.h
index 244d7c177e5a..97d3c77365b8 100644
--- a/drivers/nvme/host/trace.h
+++ b/drivers/nvme/host/trace.h
@@ -108,7 +108,7 @@ TRACE_EVENT(nvme_setup_cmd,
 		__entry->metadata = le64_to_cpu(cmd->common.metadata);
 		__assign_disk_name(__entry->disk, req->rq_disk);
 		memcpy(__entry->cdw10, &cmd->common.cdw10,
-			6 * sizeof(__entry->cdw10));
+			sizeof(__entry->cdw10));
 	    ),
 	    TP_printk("nvme%d: %sqid=%d, cmdid=%u, nsid=%u, flags=0x%x, meta=0x%llx, cmd=(%s %s)",
 		      __entry->ctrl_id, __print_disk_name(__entry->disk),
-- 
2.20.1

[PATCH 04/17] nvme: put ns_head ref if namespace fails allocation

[Christoph Hellwig]

From: Sagi Grimberg <sagi@grimberg.me>

In case nvme_alloc_ns fails after we initialize ns_head but before we
add the ns to the controller namespaces list we need to explicitly put
the ns_head reference because when we teardown the controller we
won't find it, causing us to leak a dangling subsystem eventually.

Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/core.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index dc1641247b17..d57a84f45ed0 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -3304,6 +3304,7 @@ static int nvme_alloc_ns(struct nvme_ctrl *ctrl, unsigned nsid)
 	mutex_lock(&ctrl->subsys->lock);
 	list_del_rcu(&ns->siblings);
 	mutex_unlock(&ctrl->subsys->lock);
+	nvme_put_ns_head(ns->head);
  out_free_id:
 	kfree(id);
  out_free_queue:
-- 
2.20.1

[PATCH 05/17] nvme: update comment to make the code easier to read

[Christoph Hellwig]

From: Yufen Yu <yuyufen@huawei.com>

After commit a686ed75c0fb ("nvme: introduce a helper function for
controller deletion), nvme_delete_ctrl_sync no longer use flush_work.
Update comment, accordingly.

Signed-off-by: Yufen Yu <yuyufen at huawei.com>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index d57a84f45ed0..b92fab434066 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -179,8 +179,8 @@ static int nvme_delete_ctrl_sync(struct nvme_ctrl *ctrl)
 	int ret = 0;
 
 	/*
-	 * Keep a reference until the work is flushed since ->delete_ctrl
-	 * can free the controller.
+	 * Keep a reference until nvme_do_delete_ctrl() complete,
+	 * since ->delete_ctrl can free the controller.
 	 */
 	nvme_get_ctrl(ctrl);
 	if (!nvme_change_ctrl_state(ctrl, NVME_CTRL_DELETING))
-- 
2.20.1

[PATCH 06/17] nvme-loop: init nvmet_ctrl fatal_err_work when allocate

[Christoph Hellwig]

From: Yufen Yu <yuyufen@huawei.com>

After commit 4d43d395fe (workqueue: Try to catch flush_work() without
INIT_WORK()), it can cause warning when delete nvme-loop device, trace
like:

[   76.601272] Call Trace:
[   76.601646]  ? del_timer+0x72/0xa0
[   76.602156]  __cancel_work_timer+0x1ae/0x270
[   76.602791]  cancel_work_sync+0x14/0x20
[   76.603407]  nvmet_ctrl_free+0x1b7/0x2f0 [nvmet]
[   76.604091]  ? free_percpu+0x168/0x300
[   76.604652]  nvmet_sq_destroy+0x106/0x240 [nvmet]
[   76.605346]  nvme_loop_destroy_admin_queue+0x30/0x60 [nvme_loop]
[   76.606220]  nvme_loop_shutdown_ctrl+0xc3/0xf0 [nvme_loop]
[   76.607026]  nvme_loop_delete_ctrl_host+0x19/0x30 [nvme_loop]
[   76.607871]  nvme_do_delete_ctrl+0x75/0xb0
[   76.608477]  nvme_sysfs_delete+0x7d/0xc0
[   76.609057]  dev_attr_store+0x24/0x40
[   76.609603]  sysfs_kf_write+0x4c/0x60
[   76.610144]  kernfs_fop_write+0x19a/0x260
[   76.610742]  __vfs_write+0x1c/0x60
[   76.611246]  vfs_write+0xfa/0x280
[   76.611739]  ksys_write+0x6e/0x120
[   76.612238]  __x64_sys_write+0x1e/0x30
[   76.612787]  do_syscall_64+0xbf/0x3a0
[   76.613329]  entry_SYSCALL_64_after_hwframe+0x44/0xa9

We fix it by moving fatal_err_work init to nvmet_alloc_ctrl(), which may
more reasonable.

Signed-off-by: Yufen Yu <yuyufen at huawei.com>
Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
Reviewed-by: Bart Van Assche <bvanassche at acm.org>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/target/core.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index d44ede147263..2d73b66e3686 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -1163,6 +1163,15 @@ static void nvmet_release_p2p_ns_map(struct nvmet_ctrl *ctrl)
 	put_device(ctrl->p2p_client);
 }
 
+static void nvmet_fatal_error_handler(struct work_struct *work)
+{
+	struct nvmet_ctrl *ctrl =
+			container_of(work, struct nvmet_ctrl, fatal_err_work);
+
+	pr_err("ctrl %d fatal error occurred!\n", ctrl->cntlid);
+	ctrl->ops->delete_ctrl(ctrl);
+}
+
 u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
 		struct nvmet_req *req, u32 kato, struct nvmet_ctrl **ctrlp)
 {
@@ -1205,6 +1214,7 @@ u16 nvmet_alloc_ctrl(const char *subsysnqn, const char *hostnqn,
 	INIT_WORK(&ctrl->async_event_work, nvmet_async_event_work);
 	INIT_LIST_HEAD(&ctrl->async_events);
 	INIT_RADIX_TREE(&ctrl->p2p_ns_map, GFP_KERNEL);
+	INIT_WORK(&ctrl->fatal_err_work, nvmet_fatal_error_handler);
 
 	memcpy(ctrl->subsysnqn, subsysnqn, NVMF_NQN_SIZE);
 	memcpy(ctrl->hostnqn, hostnqn, NVMF_NQN_SIZE);
@@ -1308,21 +1318,11 @@ void nvmet_ctrl_put(struct nvmet_ctrl *ctrl)
 	kref_put(&ctrl->ref, nvmet_ctrl_free);
 }
 
-static void nvmet_fatal_error_handler(struct work_struct *work)
-{
-	struct nvmet_ctrl *ctrl =
-			container_of(work, struct nvmet_ctrl, fatal_err_work);
-
-	pr_err("ctrl %d fatal error occurred!\n", ctrl->cntlid);
-	ctrl->ops->delete_ctrl(ctrl);
-}
-
 void nvmet_ctrl_fatal_error(struct nvmet_ctrl *ctrl)
 {
 	mutex_lock(&ctrl->lock);
 	if (!(ctrl->csts & NVME_CSTS_CFS)) {
 		ctrl->csts |= NVME_CSTS_CFS;
-		INIT_WORK(&ctrl->fatal_err_work, nvmet_fatal_error_handler);
 		schedule_work(&ctrl->fatal_err_work);
 	}
 	mutex_unlock(&ctrl->lock);
-- 
2.20.1

[PATCH 07/17] nvme-fc: use nr_phys_segments to determine existence of sgl

[Christoph Hellwig]

From: James Smart <jsmart2021@gmail.com>

For some nvme command, when issued by the nvme core layer, there
is an internal buffer which can cause blk_rq_payload_bytes() to
return a non-zero value yet there is no actual/real command payload
and sg list.  An example is the WRITE ZEROES command.

To address this, when making choices on whether to dma map an sgl,
use blk_rq_nr_phys_segments() instead of blk_rq_payload_bytes().
When there is a sgl, blk_rq_payload_bytes() will return the amount
of data to be transferred by the sgl.

Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
Signed-off-by: James Smart <jsmart2021 at gmail.com>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/fc.c | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index b29b12498a1a..ba8f2a9cbdaf 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2107,7 +2107,7 @@ nvme_fc_map_data(struct nvme_fc_ctrl *ctrl, struct request *rq,
 
 	freq->sg_cnt = 0;
 
-	if (!blk_rq_payload_bytes(rq))
+	if (!blk_rq_nr_phys_segments(rq))
 		return 0;
 
 	freq->sg_table.sgl = freq->first_sgl;
@@ -2304,12 +2304,23 @@ nvme_fc_queue_rq(struct blk_mq_hw_ctx *hctx,
 	if (ret)
 		return ret;
 
-	data_len = blk_rq_payload_bytes(rq);
-	if (data_len)
+	/*
+	 * nvme core doesn't quite treat the rq opaquely. Commands such
+	 * as WRITE ZEROES will return a non-zero rq payload_bytes yet
+	 * there is no actual payload to be transferred.
+	 * To get it right, key data transmission on there being 1 or
+	 * more physical segments in the sg list. If there is no
+	 * physical segments, there is no payload.
+	 */
+	if (blk_rq_nr_phys_segments(rq)) {
+		data_len = blk_rq_payload_bytes(rq);
 		io_dir = ((rq_data_dir(rq) == WRITE) ?
 					NVMEFC_FCP_WRITE : NVMEFC_FCP_READ);
-	else
+	} else {
+		data_len = 0;
 		io_dir = NVMEFC_FCP_NODATA;
+	}
+
 
 	return nvme_fc_start_fcp_op(ctrl, queue, op, data_len, io_dir);
 }
-- 
2.20.1

[PATCH 08/17] nvme-fc: fix numa_node when dev is null

[Christoph Hellwig]

From: James Smart <jsmart2021@gmail.com>

A recent change added a numa_node field to the nvme controller
and has the transport assign the node using dev_to_node().
However, fcloop registers with a NULL device struct, so the
dev_to_node() call oops.

Revise the assignment to assign no node when device struct is null.

Fixes: 103e515efa89b ("nvme: add a numa_node field to struct nvme_ctrl")
Reported-by: Mike Snitzer <snitzer at redhat.com>
Signed-off-by: James Smart <jsmart2021 at gmail.com>
Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
Reviewed-by: Hannes Reinecke <hare at suse.com>
Reviewed-by: Mike Snitzer <snitzer at redhat.com>
[hch: small coding style fixup]
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/fc.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index ba8f2a9cbdaf..23f6bad19274 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -3017,7 +3017,10 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
 
 	ctrl->ctrl.opts = opts;
 	ctrl->ctrl.nr_reconnects = 0;
-	ctrl->ctrl.numa_node = dev_to_node(lport->dev);
+	if (lport->dev)
+		ctrl->ctrl.numa_node = dev_to_node(lport->dev);
+	else
+		ctrl->ctrl.numa_node = NUMA_NO_NODE;
 	INIT_LIST_HEAD(&ctrl->ctrl_list);
 	ctrl->lport = lport;
 	ctrl->rport = rport;
-- 
2.20.1

[PATCH 09/17] nvme-fc: reject reconnect if io queue count is reduced to zero

[Christoph Hellwig]

From: James Smart <jsmart2021@gmail.com>

If:

 - A successful connect has occurred with an io queue count greater than
   zero and namespaces detected and running.
 - An error or something occurs which causes a termination of the prior
   association and then starts a reconnect,
 - The reconnect then creates a new controller, but for whatever reason,
   nvme_set_queue_count() results in io queue count set to zero.  This
   will skip io queue and tag set changes.
 - But... the controller will transition to live, calling
   nvme_start_ctrl, which calls nvme_start_queues(), which then releases
   I/Os into the transport which then sends them to the driver.

As there are no queues, things eventually hit the driver looking for a
handle, which was cleared when the original controller was reset, and it
can't proceed. Worst case, things progress, but everything fails.

In the failing scenario, the nvme_set_features(NVME_FEAT_NUM_QUEUES)
command actually failed with a NVME_SC_INTERNAL error.  For some reason,
although nvme_set_queue_count() saw the error and set io queue count to
zero, it doesn't return a failure status to the transport, which allows
the transport to continue using the controller.

Fix the problem by simply rejecting the new association if at least 1
I/O queue can't be created. The association reject will fail the
reconnect attempt and fall into the reconnect retry policy.

Signed-off-by: James Smart <jsmart2021 at gmail.com>
Reviewed-by: Sagi Grimberg <sagi at grimberg.me>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/fc.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index 23f6bad19274..f3b9d91ba0df 100644
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -2475,6 +2475,7 @@ static int
 nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl)
 {
 	struct nvmf_ctrl_options *opts = ctrl->ctrl.opts;
+	u32 prior_ioq_cnt = ctrl->ctrl.queue_count - 1;
 	unsigned int nr_io_queues;
 	int ret;
 
@@ -2487,6 +2488,13 @@ nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl)
 		return ret;
 	}
 
+	if (!nr_io_queues && prior_ioq_cnt) {
+		dev_info(ctrl->ctrl.device,
+			"Fail Reconnect: At least 1 io queue "
+			"required (was %d)\n", prior_ioq_cnt);
+		return -ENOSPC;
+	}
+
 	ctrl->ctrl.queue_count = nr_io_queues + 1;
 	/* check for io queues existing */
 	if (ctrl->ctrl.queue_count == 1)
@@ -2500,6 +2508,10 @@ nvme_fc_recreate_io_queues(struct nvme_fc_ctrl *ctrl)
 	if (ret)
 		goto out_delete_hw_queues;
 
+	if (prior_ioq_cnt != nr_io_queues)
+		dev_info(ctrl->ctrl.device,
+			"reconnect: revising io queue count from %d to %d\n",
+			prior_ioq_cnt, nr_io_queues);
 	blk_mq_update_nr_hw_queues(&ctrl->tag_set, nr_io_queues);
 
 	return 0;
-- 
2.20.1

[PATCH 10/17] nvmet-fc: fix issues with targetport assoc_list list walking

[Christoph Hellwig]

From: James Smart <jsmart2021@gmail.com>

There are two changes:

1) The logic in the __nvmet_fc_free_assoc() routine is bad. It uses
"safe" routines assuming pointers will come back valid.  However, the
intervening next structure being linked can be removed from the list and
the resulting safe pointers are bad, resulting in NULL ptrs being hit.

Correct by scheduling a work element to perform the association delete,
which can be done while under lock.

2) Prior patch that added the work element scheduling left a possible
reference on the object if the work element couldn't be scheduled.

Correct by doing the put on a failing schedule_work() call.

Signed-off-by: Nigel Kirkland <nigel.kirkland at broadcom.com>
Signed-off-by: James Smart <jsmart2021 at gmail.com>
Reviewed-by: Ewan D. Milne <emilne at redhat.com>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/target/fc.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index 1e9654f04c60..8d34aa573d5b 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -1143,10 +1143,8 @@ __nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport)
 				&tgtport->assoc_list, a_list) {
 		if (!nvmet_fc_tgt_a_get(assoc))
 			continue;
-		spin_unlock_irqrestore(&tgtport->lock, flags);
-		nvmet_fc_delete_target_assoc(assoc);
-		nvmet_fc_tgt_a_put(assoc);
-		spin_lock_irqsave(&tgtport->lock, flags);
+		if (!schedule_work(&assoc->del_work))
+			nvmet_fc_tgt_a_put(assoc);
 	}
 	spin_unlock_irqrestore(&tgtport->lock, flags);
 }
@@ -1185,7 +1183,8 @@ nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl)
 		nvmet_fc_tgtport_put(tgtport);
 
 		if (found_ctrl) {
-			schedule_work(&assoc->del_work);
+			if (schedule_work(&assoc->del_work))
+				nvmet_fc_tgt_a_put(assoc);
 			return;
 		}
 
-- 
2.20.1

[PATCH 11/17] nvmet-fc: bring Disconnect into compliance with FC-NVME spec

[Christoph Hellwig]

From: James Smart <jsmart2021@gmail.com>

The FC-NVME spec, when finally approved, modified the disconnect LS
such that the only scope available is the association.

Rework the Disconnect LS processing to be in accordance with the
change.

Signed-off-by: Nigel Kirkland <nigel.kirkland at broadcom.com>
Signed-off-by: James Smart <jsmart2021 at gmail.com>
Reviewed-by: Ewan D. Milne <emilne at redhat.com>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/target/fc.c | 33 ++-------------------------------
 1 file changed, 2 insertions(+), 31 deletions(-)

diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
index 8d34aa573d5b..7f051f9dfa8f 100644
--- a/drivers/nvme/target/fc.c
+++ b/drivers/nvme/target/fc.c
@@ -1502,10 +1502,8 @@ nvmet_fc_ls_disconnect(struct nvmet_fc_tgtport *tgtport,
 			(struct fcnvme_ls_disconnect_rqst *)iod->rqstbuf;
 	struct fcnvme_ls_disconnect_acc *acc =
 			(struct fcnvme_ls_disconnect_acc *)iod->rspbuf;
-	struct nvmet_fc_tgt_queue *queue = NULL;
 	struct nvmet_fc_tgt_assoc *assoc;
 	int ret = 0;
-	bool del_assoc = false;
 
 	memset(acc, 0, sizeof(*acc));
 
@@ -1536,18 +1534,7 @@ nvmet_fc_ls_disconnect(struct nvmet_fc_tgtport *tgtport,
 		assoc = nvmet_fc_find_target_assoc(tgtport,
 				be64_to_cpu(rqst->associd.association_id));
 		iod->assoc = assoc;
-		if (assoc) {
-			if (rqst->discon_cmd.scope ==
-					FCNVME_DISCONN_CONNECTION) {
-				queue = nvmet_fc_find_target_queue(tgtport,
-						be64_to_cpu(
-							rqst->discon_cmd.id));
-				if (!queue) {
-					nvmet_fc_tgt_a_put(assoc);
-					ret = VERR_NO_CONN;
-				}
-			}
-		} else
+		if (!assoc)
 			ret = VERR_NO_ASSOC;
 	}
 
@@ -1575,26 +1562,10 @@ nvmet_fc_ls_disconnect(struct nvmet_fc_tgtport *tgtport,
 				sizeof(struct fcnvme_ls_disconnect_acc)),
 			FCNVME_LS_DISCONNECT);
 
-
-	/* are we to delete a Connection ID (queue) */
-	if (queue) {
-		int qid = queue->qid;
-
-		nvmet_fc_delete_target_queue(queue);
-
-		/* release the get taken by find_target_queue */
-		nvmet_fc_tgt_q_put(queue);
-
-		/* tear association down if io queue terminated */
-		if (!qid)
-			del_assoc = true;
-	}
-
 	/* release get taken in nvmet_fc_find_target_assoc */
 	nvmet_fc_tgt_a_put(iod->assoc);
 
-	if (del_assoc)
-		nvmet_fc_delete_target_assoc(iod->assoc);
+	nvmet_fc_delete_target_assoc(iod->assoc);
 }
 
 
-- 
2.20.1

[PATCH 12/17] nvme: disable Write Zeroes for qemu controllers

[Christoph Hellwig]

Qemu started out with a broken implementation of Write Zeroes written
by yours truly.  Disable Write Zeroes on qemu for now, eventually
we need to go back and make all the qemu quirks version specific,
but that is left for another time.

Signed-off-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Keith Busch <keith.busch at intel.com>
Tested-by: Ming Lei <ming.lei at redhat.com>
---
 drivers/nvme/host/core.c | 3 ++-
 drivers/nvme/host/nvme.h | 5 +++++
 drivers/nvme/host/pci.c  | 3 ++-
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index b92fab434066..951e9f31b57c 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1531,7 +1531,8 @@ static inline void nvme_config_write_zeroes(struct nvme_ns *ns)
 	u32 max_sectors;
 	unsigned short bs = 1 << ns->lba_shift;
 
-	if (!(ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES))
+	if (!(ns->ctrl->oncs & NVME_CTRL_ONCS_WRITE_ZEROES) ||
+	    (ns->ctrl->quirks & NVME_QUIRK_DISABLE_WRITE_ZEROES))
 		return;
 	/*
 	 * Even though NVMe spec explicitly states that MDTS is not
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index b91f1838bbd5..527d64545023 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -87,6 +87,11 @@ enum nvme_quirks {
 	 * Ignore device provided subnqn.
 	 */
 	NVME_QUIRK_IGNORE_DEV_SUBNQN		= (1 << 8),
+
+	/*
+	 * Broken Write Zeroes.
+	 */
+	NVME_QUIRK_DISABLE_WRITE_ZEROES		= (1 << 9),
 };
 
 /*
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index f54718b63637..3a2377888a46 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2975,7 +2975,8 @@ static const struct pci_device_id nvme_id_table[] = {
 	{ PCI_VDEVICE(INTEL, 0xf1a6),	/* Intel 760p/Pro 7600p */
 		.driver_data = NVME_QUIRK_IGNORE_DEV_SUBNQN, },
 	{ PCI_VDEVICE(INTEL, 0x5845),	/* Qemu emulated controller */
-		.driver_data = NVME_QUIRK_IDENTIFY_CNS, },
+		.driver_data = NVME_QUIRK_IDENTIFY_CNS |
+				NVME_QUIRK_DISABLE_WRITE_ZEROES, },
 	{ PCI_DEVICE(0x1bb1, 0x0100),   /* Seagate Nytro Flash Storage */
 		.driver_data = NVME_QUIRK_DELAY_BEFORE_CHK_RDY, },
 	{ PCI_DEVICE(0x1c58, 0x0003),	/* HGST adapter */
-- 
2.20.1

[PATCH 13/17] nvme: remove nvme_ns_config_oncs

[Christoph Hellwig]

Just opencode the two function calls in the caller.

Signed-off-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Keith Busch <keith.busch at intel.com>
Reviewed-by: Max Gurtovoy <maxg at mellanox.com>
Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
Tested-by: Sagi Grimberg <sagi at grimberg.me>
---
 drivers/nvme/host/core.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 951e9f31b57c..26ae805fc958 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1552,12 +1552,6 @@ static inline void nvme_config_write_zeroes(struct nvme_ns *ns)
 	blk_queue_max_write_zeroes_sectors(ns->queue, max_sectors);
 }
 
-static inline void nvme_ns_config_oncs(struct nvme_ns *ns)
-{
-	nvme_config_discard(ns);
-	nvme_config_write_zeroes(ns);
-}
-
 static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
 		struct nvme_id_ns *id, struct nvme_ns_ids *ids)
 {
@@ -1611,7 +1605,9 @@ static void nvme_update_disk_info(struct gendisk *disk,
 		capacity = 0;
 
 	set_capacity(disk, capacity);
-	nvme_ns_config_oncs(ns);
+
+	nvme_config_discard(ns);
+	nvme_config_write_zeroes(ns);
 
 	if (id->nsattr & (1 << 0))
 		set_disk_ro(disk, true);
-- 
2.20.1

[PATCH 14/17] nvme: add proper discard setup for the multipath device

[Christoph Hellwig]

Add a gendisk argument to nvme_config_discard so that the call to
nvme_update_disk_info for the multipath device node updates the
proper request_queue.

Signed-off-by: Christoph Hellwig <hch at lst.de>
Reported-by: Sagi Grimberg <sagi at grimberg.me>
Reviewed-by: Keith Busch <keith.busch at intel.com>
Reviewed-by: Max Gurtovoy <maxg at mellanox.com>
Tested-by: Sagi Grimberg <sagi at grimberg.me>
---
 drivers/nvme/host/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 26ae805fc958..6a57ece7d76b 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1495,10 +1495,10 @@ static void nvme_set_chunk_size(struct nvme_ns *ns)
 	blk_queue_chunk_sectors(ns->queue, rounddown_pow_of_two(chunk_size));
 }
 
-static void nvme_config_discard(struct nvme_ns *ns)
+static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns)
 {
 	struct nvme_ctrl *ctrl = ns->ctrl;
-	struct request_queue *queue = ns->queue;
+	struct request_queue *queue = disk->queue;
 	u32 size = queue_logical_block_size(queue);
 
 	if (!(ctrl->oncs & NVME_CTRL_ONCS_DSM)) {
@@ -1606,7 +1606,7 @@ static void nvme_update_disk_info(struct gendisk *disk,
 
 	set_capacity(disk, capacity);
 
-	nvme_config_discard(ns);
+	nvme_config_discard(disk, ns);
 	nvme_config_write_zeroes(ns);
 
 	if (id->nsattr & (1 << 0))
-- 
2.20.1

[PATCH 15/17] nvme: add proper write zeroes setup for the multipath device

[Christoph Hellwig]

Add a gendisk argument to nvme_config_write_zeroes so that the call to
nvme_update_disk_info for the multipath device node updates the
proper request_queue.

Signed-off-by: Christoph Hellwig <hch at lst.de>
Reviewed-by: Keith Busch <keith.busch at intel.com>
Reviewed-by: Max Gurtovoy <maxg at mellanox.com>
Tested-by: Sagi Grimberg <sagi at grimberg.me>
---
 drivers/nvme/host/core.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 6a57ece7d76b..470601980794 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1526,7 +1526,7 @@ static void nvme_config_discard(struct gendisk *disk, struct nvme_ns *ns)
 		blk_queue_max_write_zeroes_sectors(queue, UINT_MAX);
 }
 
-static inline void nvme_config_write_zeroes(struct nvme_ns *ns)
+static void nvme_config_write_zeroes(struct gendisk *disk, struct nvme_ns *ns)
 {
 	u32 max_sectors;
 	unsigned short bs = 1 << ns->lba_shift;
@@ -1549,7 +1549,7 @@ static inline void nvme_config_write_zeroes(struct nvme_ns *ns)
 	else
 		max_sectors = ((u32)(ns->ctrl->max_hw_sectors + 1) * bs) >> 9;
 
-	blk_queue_max_write_zeroes_sectors(ns->queue, max_sectors);
+	blk_queue_max_write_zeroes_sectors(disk->queue, max_sectors);
 }
 
 static void nvme_report_ns_ids(struct nvme_ctrl *ctrl, unsigned int nsid,
@@ -1607,7 +1607,7 @@ static void nvme_update_disk_info(struct gendisk *disk,
 	set_capacity(disk, capacity);
 
 	nvme_config_discard(disk, ns);
-	nvme_config_write_zeroes(ns);
+	nvme_config_write_zeroes(disk, ns);
 
 	if (id->nsattr & (1 << 0))
 		set_disk_ro(disk, true);
-- 
2.20.1

[PATCH 16/17] nvmet: ignore EOPNOTSUPP for discard

[Christoph Hellwig]

NVMe DSM is a pure hint, so if the underlying device / file system
does not support discard-like operations we should not fail the
operation but rather return success.

Fixes: 3b031d15995f ("nvmet: add error log support for bdev backend")
Signed-off-by: Christoph Hellwig <hch at lst.de>
Reviewed by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
Tested-by: Sagi Grimberg <sagi at grimberg.me>
---
 drivers/nvme/target/io-cmd-bdev.c | 8 ++++----
 drivers/nvme/target/io-cmd-file.c | 2 +-
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/nvme/target/io-cmd-bdev.c b/drivers/nvme/target/io-cmd-bdev.c
index 71dfedbadc26..a065dbfc43b1 100644
--- a/drivers/nvme/target/io-cmd-bdev.c
+++ b/drivers/nvme/target/io-cmd-bdev.c
@@ -194,11 +194,11 @@ static u16 nvmet_bdev_discard_range(struct nvmet_req *req,
 			le64_to_cpu(range->slba) << (ns->blksize_shift - 9),
 			le32_to_cpu(range->nlb) << (ns->blksize_shift - 9),
 			GFP_KERNEL, 0, bio);
-
-	if (ret)
+	if (ret && ret != -EOPNOTSUPP) {
 		req->error_slba = le64_to_cpu(range->slba);
-
-	return blk_to_nvme_status(req, errno_to_blk_status(ret));
+		return blk_to_nvme_status(req, errno_to_blk_status(ret));
+	}
+	return NVME_SC_SUCCESS;
 }
 
 static void nvmet_bdev_execute_discard(struct nvmet_req *req)
diff --git a/drivers/nvme/target/io-cmd-file.c b/drivers/nvme/target/io-cmd-file.c
index 517522305e5c..3e43212d3c1c 100644
--- a/drivers/nvme/target/io-cmd-file.c
+++ b/drivers/nvme/target/io-cmd-file.c
@@ -297,7 +297,7 @@ static void nvmet_file_execute_discard(struct nvmet_req *req)
 		}
 
 		ret = vfs_fallocate(req->ns->file, mode, offset, len);
-		if (ret) {
+		if (ret && ret != -EOPNOTSUPP) {
 			req->error_slba = le64_to_cpu(range.slba);
 			status = errno_to_nvme_status(req, ret);
 			break;
-- 
2.20.1

[PATCH 17/17] nvme-tcp: support C2HData with SUCCESS flag

[Christoph Hellwig]

From: Sagi Grimberg <sagi@grimberg.me>

A C2HData PDU with the SUCCESS flag set indicates that the I/O was
completed by the controller successfully and means that a subsequent
completion response capsule PDU will be ommitted.

If we see this flag, fisrt we check that LAST_PDU flag is set as well,
and then we complete the request when the data transfer (and data digest
verification if its on) is done.

While we're at it, reuse a bit of code with nvme_fail_request.

Reported-by: Steve Blightman <steve.blightman at oracle.com>
Suggested-by: Oliver Smith-Denny <osmithde at cisco.com>
Signed-off-by: Sagi Grimberg <sagi at grimberg.me>
Reviewed-by: Oliver Smith-Denny <osmithde at cisco.com>
Tested-by: Oliver Smith-Denny <osmithde at cisco.com>
Signed-off-by: Christoph Hellwig <hch at lst.de>
---
 drivers/nvme/host/tcp.c | 32 ++++++++++++++++++++++++++++----
 1 file changed, 28 insertions(+), 4 deletions(-)

diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 208ee518af65..e7e08889865e 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c
@@ -463,6 +463,15 @@ static int nvme_tcp_handle_c2h_data(struct nvme_tcp_queue *queue,
 
 	queue->data_remaining = le32_to_cpu(pdu->data_length);
 
+	if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS &&
+	    unlikely(!(pdu->hdr.flags & NVME_TCP_F_DATA_LAST))) {
+		dev_err(queue->ctrl->ctrl.device,
+			"queue %d tag %#x SUCCESS set but not last PDU\n",
+			nvme_tcp_queue_id(queue), rq->tag);
+		nvme_tcp_error_recovery(&queue->ctrl->ctrl);
+		return -EPROTO;
+	}
+
 	return 0;
 
 }
@@ -618,6 +627,14 @@ static int nvme_tcp_recv_pdu(struct nvme_tcp_queue *queue, struct sk_buff *skb,
 	return ret;
 }
 
+static inline void nvme_tcp_end_request(struct request *rq, __le16 status)
+{
+	union nvme_result res = {};
+
+	nvme_end_request(rq, cpu_to_le16(status << 1), res);
+}
+
+
 static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb,
 			      unsigned int *offset, size_t *len)
 {
@@ -685,6 +702,8 @@ static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb,
 			nvme_tcp_ddgst_final(queue->rcv_hash, &queue->exp_ddgst);
 			queue->ddgst_remaining = NVME_TCP_DIGEST_LENGTH;
 		} else {
+			if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS)
+				nvme_tcp_end_request(rq, NVME_SC_SUCCESS);
 			nvme_tcp_init_recv_ctx(queue);
 		}
 	}
@@ -695,6 +714,7 @@ static int nvme_tcp_recv_data(struct nvme_tcp_queue *queue, struct sk_buff *skb,
 static int nvme_tcp_recv_ddgst(struct nvme_tcp_queue *queue,
 		struct sk_buff *skb, unsigned int *offset, size_t *len)
 {
+	struct nvme_tcp_data_pdu *pdu = (void *)queue->pdu;
 	char *ddgst = (char *)&queue->recv_ddgst;
 	size_t recv_len = min_t(size_t, *len, queue->ddgst_remaining);
 	off_t off = NVME_TCP_DIGEST_LENGTH - queue->ddgst_remaining;
@@ -718,6 +738,13 @@ static int nvme_tcp_recv_ddgst(struct nvme_tcp_queue *queue,
 		return -EIO;
 	}
 
+	if (pdu->hdr.flags & NVME_TCP_F_DATA_SUCCESS) {
+		struct request *rq = blk_mq_tag_to_rq(nvme_tcp_tagset(queue),
+						pdu->command_id);
+
+		nvme_tcp_end_request(rq, NVME_SC_SUCCESS);
+	}
+
 	nvme_tcp_init_recv_ctx(queue);
 	return 0;
 }
@@ -815,10 +842,7 @@ static inline void nvme_tcp_done_send_req(struct nvme_tcp_queue *queue)
 
 static void nvme_tcp_fail_request(struct nvme_tcp_request *req)
 {
-	union nvme_result res = {};
-
-	nvme_end_request(blk_mq_rq_from_pdu(req),
-		cpu_to_le16(NVME_SC_DATA_XFER_ERROR), res);
+	nvme_tcp_end_request(blk_mq_rq_from_pdu(req), NVME_SC_DATA_XFER_ERROR);
 }
 
 static int nvme_tcp_try_send_data(struct nvme_tcp_request *req)
-- 
2.20.1

[PATCHBOMB] nvme fixes for 5.1

[Jens Axboe]

On 3/13/19 11:54 AM, Christoph Hellwig wrote:
> Hi Jens,
> 
> git.infradead.org seems to have some hickups at the moment, so
> this bunch of nvme fixes will come in form of a patchbomb instead.
> 
> Most important is quirking Write Zeroes on qemu, as the implementation
> there is buggy and could lead to ext4 data corruption.  Except for
> that we have various other fixes all over the place.

Applied, thanks.

-- 
Jens Axboe

[PATCH 10/17] nvmet-fc: fix issues with targetport assoc_list list walking

[James Smart]

On 3/13/2019 10:55 AM, Christoph Hellwig wrote:
> From: James Smart <jsmart2021 at gmail.com>
>
> There are two changes:
>
> 1) The logic in the __nvmet_fc_free_assoc() routine is bad. It uses
> "safe" routines assuming pointers will come back valid.  However, the
> intervening next structure being linked can be removed from the list and
> the resulting safe pointers are bad, resulting in NULL ptrs being hit.
>
> Correct by scheduling a work element to perform the association delete,
> which can be done while under lock.
>
> 2) Prior patch that added the work element scheduling left a possible
> reference on the object if the work element couldn't be scheduled.
>
> Correct by doing the put on a failing schedule_work() call.
>
> Signed-off-by: Nigel Kirkland <nigel.kirkland at broadcom.com>
> Signed-off-by: James Smart <jsmart2021 at gmail.com>
> Reviewed-by: Ewan D. Milne <emilne at redhat.com>
> Signed-off-by: Christoph Hellwig <hch at lst.de>
> ---
>   drivers/nvme/target/fc.c | 9 ++++-----
>   1 file changed, 4 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
> index 1e9654f04c60..8d34aa573d5b 100644
> --- a/drivers/nvme/target/fc.c
> +++ b/drivers/nvme/target/fc.c
> @@ -1143,10 +1143,8 @@ __nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport)
>   				&tgtport->assoc_list, a_list) {
>   		if (!nvmet_fc_tgt_a_get(assoc))
>   			continue;
> -		spin_unlock_irqrestore(&tgtport->lock, flags);
> -		nvmet_fc_delete_target_assoc(assoc);
> -		nvmet_fc_tgt_a_put(assoc);
> -		spin_lock_irqsave(&tgtport->lock, flags);
> +		if (!schedule_work(&assoc->del_work))
> +			nvmet_fc_tgt_a_put(assoc);
>   	}
>   	spin_unlock_irqrestore(&tgtport->lock, flags);
>   }
> @@ -1185,7 +1183,8 @@ nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl)
>   		nvmet_fc_tgtport_put(tgtport);
>   
>   		if (found_ctrl) {
> -			schedule_work(&assoc->del_work);
> +			if (schedule_work(&assoc->del_work))
> +				nvmet_fc_tgt_a_put(assoc);
>   			return;
>   		}
>   
V1 was checked in 
(http://lists.infradead.org/pipermail/linux-nvme/2019-February/022193.html
V2 was skipped 
(http://lists.infradead.org/pipermail/linux-nvme/2019-February/022540.html)

V2 changes the last
+??? ??? ??? if (schedule_work(&assoc->del_work))
to
+??? ??? ??? if (!schedule_work(&assoc->del_work))


Jens - can you do this manual fixup ?

-- james

[PATCH 10/17] nvmet-fc: fix issues with targetport assoc_list list walking

[Jens Axboe]

On 3/13/19 12:53 PM, James Smart wrote:
> On 3/13/2019 10:55 AM, Christoph Hellwig wrote:
>> From: James Smart <jsmart2021 at gmail.com>
>>
>> There are two changes:
>>
>> 1) The logic in the __nvmet_fc_free_assoc() routine is bad. It uses
>> "safe" routines assuming pointers will come back valid.  However, the
>> intervening next structure being linked can be removed from the list and
>> the resulting safe pointers are bad, resulting in NULL ptrs being hit.
>>
>> Correct by scheduling a work element to perform the association delete,
>> which can be done while under lock.
>>
>> 2) Prior patch that added the work element scheduling left a possible
>> reference on the object if the work element couldn't be scheduled.
>>
>> Correct by doing the put on a failing schedule_work() call.
>>
>> Signed-off-by: Nigel Kirkland <nigel.kirkland at broadcom.com>
>> Signed-off-by: James Smart <jsmart2021 at gmail.com>
>> Reviewed-by: Ewan D. Milne <emilne at redhat.com>
>> Signed-off-by: Christoph Hellwig <hch at lst.de>
>> ---
>>   drivers/nvme/target/fc.c | 9 ++++-----
>>   1 file changed, 4 insertions(+), 5 deletions(-)
>>
>> diff --git a/drivers/nvme/target/fc.c b/drivers/nvme/target/fc.c
>> index 1e9654f04c60..8d34aa573d5b 100644
>> --- a/drivers/nvme/target/fc.c
>> +++ b/drivers/nvme/target/fc.c
>> @@ -1143,10 +1143,8 @@ __nvmet_fc_free_assocs(struct nvmet_fc_tgtport *tgtport)
>>   				&tgtport->assoc_list, a_list) {
>>   		if (!nvmet_fc_tgt_a_get(assoc))
>>   			continue;
>> -		spin_unlock_irqrestore(&tgtport->lock, flags);
>> -		nvmet_fc_delete_target_assoc(assoc);
>> -		nvmet_fc_tgt_a_put(assoc);
>> -		spin_lock_irqsave(&tgtport->lock, flags);
>> +		if (!schedule_work(&assoc->del_work))
>> +			nvmet_fc_tgt_a_put(assoc);
>>   	}
>>   	spin_unlock_irqrestore(&tgtport->lock, flags);
>>   }
>> @@ -1185,7 +1183,8 @@ nvmet_fc_delete_ctrl(struct nvmet_ctrl *ctrl)
>>   		nvmet_fc_tgtport_put(tgtport);
>>   
>>   		if (found_ctrl) {
>> -			schedule_work(&assoc->del_work);
>> +			if (schedule_work(&assoc->del_work))
>> +				nvmet_fc_tgt_a_put(assoc);
>>   			return;
>>   		}
>>   
> V1 was checked in 
> (http://lists.infradead.org/pipermail/linux-nvme/2019-February/022193.html
> V2 was skipped 
> (http://lists.infradead.org/pipermail/linux-nvme/2019-February/022540.html)
> 
> V2 changes the last
> +??? ??? ??? if (schedule_work(&assoc->del_work))
> to
> +??? ??? ??? if (!schedule_work(&assoc->del_work))
> 
> 
> Jens - can you do this manual fixup ?

Fixed up.

-- 
Jens Axboe

[PATCH 17/17] nvme-tcp: support C2HData with SUCCESS flag

[Sagi Grimberg]

Christoph, what about nvmet-tcp side?

[PATCH 17/17] nvme-tcp: support C2HData with SUCCESS flag

[Sagi Grimberg]

> Christoph, what about nvmet-tcp side?

Yea, I see it in 5.2..

[PATCH 07/17] nvme-fc: use nr_phys_segments to determine existence of sgl

[Max Gurtovoy]

On 3/13/2019 7:55 PM, Christoph Hellwig wrote:
> From: James Smart <jsmart2021 at gmail.com>
>
> For some nvme command, when issued by the nvme core layer, there
> is an internal buffer which can cause blk_rq_payload_bytes() to
> return a non-zero value yet there is no actual/real command payload
> and sg list.  An example is the WRITE ZEROES command.
>
> To address this, when making choices on whether to dma map an sgl,
> use blk_rq_nr_phys_segments() instead of blk_rq_payload_bytes().
> When there is a sgl, blk_rq_payload_bytes() will return the amount
> of data to be transferred by the sgl.
>
> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
> Signed-off-by: James Smart <jsmart2021 at gmail.com>
> Signed-off-by: Christoph Hellwig <hch at lst.de>


I guess we'll need it for all transport.

I saw that pci is covered, RDMA isn't.

Also IMO tcp should be fixed (didn't dive into it yet, just high level 
check for blk_rq_payload_bytes).

may we should have a core function for it to reduce code duplication.

[PATCH 07/17] nvme-fc: use nr_phys_segments to determine existence of sgl

[Sagi Grimberg]

>> From: James Smart <jsmart2021 at gmail.com>
>>
>> For some nvme command, when issued by the nvme core layer, there
>> is an internal buffer which can cause blk_rq_payload_bytes() to
>> return a non-zero value yet there is no actual/real command payload
>> and sg list.? An example is the WRITE ZEROES command.
>>
>> To address this, when making choices on whether to dma map an sgl,
>> use blk_rq_nr_phys_segments() instead of blk_rq_payload_bytes().
>> When there is a sgl, blk_rq_payload_bytes() will return the amount
>> of data to be transferred by the sgl.
>>
>> Signed-off-by: Chaitanya Kulkarni <chaitanya.kulkarni at wdc.com>
>> Signed-off-by: James Smart <jsmart2021 at gmail.com>
>> Signed-off-by: Christoph Hellwig <hch at lst.de>
> 
> 
> I guess we'll need it for all transport.
> 
> I saw that pci is covered, RDMA isn't.

RDMA patch is already in AFAIR...

> Also IMO tcp should be fixed (didn't dive into it yet, just high level 
> check for blk_rq_payload_bytes).

tcp already looks into RQF_SPECIAL_PAYLOAD so the issue does not apply 
to it.