Merge tag 'for-5.4/post-2019-09-24' of git://git.kernel.dk/linux-block

Pull more block updates from Jens Axboe:
 "Some later additions that weren't quite done for the first pull
  request, and also a few fixes that have arrived since.

  This contains:

   - Kill silly pktcdvd warning on attempting to register a non-scsi
     passthrough device (me)

   - Use symbolic constants for the block t10 protection types, and
     switch to handling it in core rather than in the drivers (Max)

   - libahci platform missing node put fix (Nishka)

   - Small series of fixes for BFQ (Paolo)

   - Fix possible nbd crash (Xiubo)"

* tag 'for-5.4/post-2019-09-24' of git://git.kernel.dk/linux-block:
  block: drop device references in bsg_queue_rq()
  block: t10-pi: fix -Wswitch warning
  pktcdvd: remove warning on attempting to register non-passthrough dev
  ata: libahci_platform: Add of_node_put() before loop exit
  nbd: fix possible page fault for nbd disk
  nbd: rename the runtime flags as NBD_RT_ prefixed
  block, bfq: push up injection only after setting service time
  block, bfq: increase update frequency of inject limit
  block, bfq: reduce upper bound for inject limit to max_rq_in_driver+1
  block, bfq: update inject limit only after injection occurred
  block: centralize PI remapping logic to the block layer
  block: use symbolic constants for t10_pi type

6 files changed, 144 insertions, 94 deletions

diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c
index b33be928d164..0319d6339822 100644
--- a/block/bfq-iosched.c
+++ b/block/bfq-iosched.c
@@ -2016,7 +2016,7 @@ static void bfq_add_request(struct request *rq)
 		     (bfqq->last_serv_time_ns > 0 &&
 		      bfqd->rqs_injected && bfqd->rq_in_driver > 0)) &&
 		    time_is_before_eq_jiffies(bfqq->decrease_time_jif +
-					      msecs_to_jiffies(100))) {
+					      msecs_to_jiffies(10))) {
 			bfqd->last_empty_occupied_ns = ktime_get_ns();
 			/*
 			 * Start the state machine for measuring the
@@ -2025,7 +2025,21 @@ static void bfq_add_request(struct request *rq)
 			 * be set when rq will be dispatched.
 			 */
 			bfqd->wait_dispatch = true;
-			bfqd->rqs_injected = false;
+			/*
+			 * If there is no I/O in service in the drive,
+			 * then possible injection occurred before the
+			 * arrival of rq will not affect the total
+			 * service time of rq. So the injection limit
+			 * must not be updated as a function of such
+			 * total service time, unless new injection
+			 * occurs before rq is completed. To have the
+			 * injection limit updated only in the latter
+			 * case, reset rqs_injected here (rqs_injected
+			 * will be set in case injection is performed
+			 * on bfqq before rq is completed).
+			 */
+			if (bfqd->rq_in_driver == 0)
+				bfqd->rqs_injected = false;
 		}
 	}
 
@@ -5784,14 +5798,14 @@ static void bfq_update_inject_limit(struct bfq_data *bfqd,
 	u64 tot_time_ns = ktime_get_ns() - bfqd->last_empty_occupied_ns;
 	unsigned int old_limit = bfqq->inject_limit;
 
-	if (bfqq->last_serv_time_ns > 0) {
+	if (bfqq->last_serv_time_ns > 0 && bfqd->rqs_injected) {
 		u64 threshold = (bfqq->last_serv_time_ns * 3)>>1;
 
 		if (tot_time_ns >= threshold && old_limit > 0) {
 			bfqq->inject_limit--;
 			bfqq->decrease_time_jif = jiffies;
 		} else if (tot_time_ns < threshold &&
-			   old_limit < bfqd->max_rq_in_driver<<1)
+			   old_limit <= bfqd->max_rq_in_driver)
 			bfqq->inject_limit++;
 	}
 
@@ -5809,12 +5823,14 @@ static void bfq_update_inject_limit(struct bfq_data *bfqd,
 	 */
 	if ((bfqq->last_serv_time_ns == 0 && bfqd->rq_in_driver == 1) ||
 	    tot_time_ns < bfqq->last_serv_time_ns) {
+		if (bfqq->last_serv_time_ns == 0) {
+			/*
+			 * Now we certainly have a base value: make sure we
+			 * start trying injection.
+			 */
+			bfqq->inject_limit = max_t(unsigned int, 1, old_limit);
+		}
 		bfqq->last_serv_time_ns = tot_time_ns;
-		/*
-		 * Now we certainly have a base value: make sure we
-		 * start trying injection.
-		 */
-		bfqq->inject_limit = max_t(unsigned int, 1, old_limit);
 	} else if (!bfqd->rqs_injected && bfqd->rq_in_driver == 1)
 		/*
 		 * No I/O injected and no request still in service in
@@ -5830,6 +5846,7 @@ static void bfq_update_inject_limit(struct bfq_data *bfqd,
 
 	/* update complete, not waiting for any request completion any longer */
 	bfqd->waited_rq = NULL;
+	bfqd->rqs_injected = false;
 }
 
 /*
diff --git a/block/blk-core.c b/block/blk-core.c
index 875e8d105067..d5e668ec751b 100644
--- a/block/blk-core.c
+++ b/block/blk-core.c
@@ -34,6 +34,7 @@
 #include <linux/ratelimit.h>
 #include <linux/pm_runtime.h>
 #include <linux/blk-cgroup.h>
+#include <linux/t10-pi.h>
 #include <linux/debugfs.h>
 #include <linux/bpf.h>
 #include <linux/psi.h>
@@ -1436,6 +1437,12 @@ bool blk_update_request(struct request *req, blk_status_t error,
 	if (!req->bio)
 		return false;
 
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+	if (blk_integrity_rq(req) && req_op(req) == REQ_OP_READ &&
+	    error == BLK_STS_OK)
+		req->q->integrity.profile->complete_fn(req, nr_bytes);
+#endif
+
 	if (unlikely(error && !blk_rq_is_passthrough(req) &&
 		     !(req->rq_flags & RQF_QUIET)))
 		print_req_error(req, error, __func__);
diff --git a/block/blk-integrity.c b/block/blk-integrity.c
index ca39b4624cf8..ff1070edbb40 100644
--- a/block/blk-integrity.c
+++ b/block/blk-integrity.c
@@ -368,10 +368,21 @@ static blk_status_t blk_integrity_nop_fn(struct blk_integrity_iter *iter)
 	return BLK_STS_OK;
 }
 
+static void blk_integrity_nop_prepare(struct request *rq)
+{
+}
+
+static void blk_integrity_nop_complete(struct request *rq,
+		unsigned int nr_bytes)
+{
+}
+
 static const struct blk_integrity_profile nop_profile = {
 	.name = "nop",
 	.generate_fn = blk_integrity_nop_fn,
 	.verify_fn = blk_integrity_nop_fn,
+	.prepare_fn = blk_integrity_nop_prepare,
+	.complete_fn = blk_integrity_nop_complete,
 };
 
 /**
diff --git a/block/blk-mq.c b/block/blk-mq.c
index 20a49be536b5..29275f5a996f 100644
--- a/block/blk-mq.c
+++ b/block/blk-mq.c
@@ -30,6 +30,7 @@
 #include <trace/events/block.h>
 
 #include <linux/blk-mq.h>
+#include <linux/t10-pi.h>
 #include "blk.h"
 #include "blk-mq.h"
 #include "blk-mq-debugfs.h"
@@ -700,6 +701,11 @@ void blk_mq_start_request(struct request *rq)
 		 */
 		rq->nr_phys_segments++;
 	}
+
+#ifdef CONFIG_BLK_DEV_INTEGRITY
+	if (blk_integrity_rq(rq) && req_op(rq) == REQ_OP_WRITE)
+		q->integrity.profile->prepare_fn(rq);
+#endif
 }
 EXPORT_SYMBOL(blk_mq_start_request);
 
diff --git a/block/bsg-lib.c b/block/bsg-lib.c
index 785dd58947f1..347dda16c2f4 100644
--- a/block/bsg-lib.c
+++ b/block/bsg-lib.c
@@ -266,6 +266,7 @@ static blk_status_t bsg_queue_rq(struct blk_mq_hw_ctx *hctx,
 	struct request *req = bd->rq;
 	struct bsg_set *bset =
 		container_of(q->tag_set, struct bsg_set, tag_set);
+	int sts = BLK_STS_IOERR;
 	int ret;
 
 	blk_mq_start_request(req);
@@ -274,14 +275,15 @@ static blk_status_t bsg_queue_rq(struct blk_mq_hw_ctx *hctx,
 		return BLK_STS_IOERR;
 
 	if (!bsg_prepare_job(dev, req))
-		return BLK_STS_IOERR;
+		goto out;
 
 	ret = bset->job_fn(blk_mq_rq_to_pdu(req));
-	if (ret)
-		return BLK_STS_IOERR;
+	if (!ret)
+		sts = BLK_STS_OK;
 
+out:
 	put_device(dev);
-	return BLK_STS_OK;
+	return sts;
 }
 
 /* called right after the request is allocated for the request_queue */
diff --git a/block/t10-pi.c b/block/t10-pi.c
index 0c0094609dd6..9803c7e0376e 100644
--- a/block/t10-pi.c
+++ b/block/t10-pi.c
@@ -27,7 +27,7 @@ static __be16 t10_pi_ip_fn(void *data, unsigned int len)
  * tag.
  */
 static blk_status_t t10_pi_generate(struct blk_integrity_iter *iter,
-		csum_fn *fn, unsigned int type)
+		csum_fn *fn, enum t10_dif_type type)
 {
 	unsigned int i;
 
@@ -37,7 +37,7 @@ static blk_status_t t10_pi_generate(struct blk_integrity_iter *iter,
 		pi->guard_tag = fn(iter->data_buf, iter->interval);
 		pi->app_tag = 0;
 
-		if (type == 1)
+		if (type == T10_PI_TYPE1_PROTECTION)
 			pi->ref_tag = cpu_to_be32(lower_32_bits(iter->seed));
 		else
 			pi->ref_tag = 0;
@@ -51,17 +51,18 @@ static blk_status_t t10_pi_generate(struct blk_integrity_iter *iter,
 }
 
 static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
-		csum_fn *fn, unsigned int type)
+		csum_fn *fn, enum t10_dif_type type)
 {
 	unsigned int i;
 
+	BUG_ON(type == T10_PI_TYPE0_PROTECTION);
+
 	for (i = 0 ; i < iter->data_size ; i += iter->interval) {
 		struct t10_pi_tuple *pi = iter->prot_buf;
 		__be16 csum;
 
-		switch (type) {
-		case 1:
-		case 2:
+		if (type == T10_PI_TYPE1_PROTECTION ||
+		    type == T10_PI_TYPE2_PROTECTION) {
 			if (pi->app_tag == T10_PI_APP_ESCAPE)
 				goto next;
 
@@ -73,12 +74,10 @@ static blk_status_t t10_pi_verify(struct blk_integrity_iter *iter,
 				       iter->seed, be32_to_cpu(pi->ref_tag));
 				return BLK_STS_PROTECTION;
 			}
-			break;
-		case 3:
+		} else if (type == T10_PI_TYPE3_PROTECTION) {
 			if (pi->app_tag == T10_PI_APP_ESCAPE &&
 			    pi->ref_tag == T10_PI_REF_ESCAPE)
 				goto next;
-			break;
 		}
 
 		csum = fn(iter->data_buf, iter->interval);
@@ -102,94 +101,40 @@ next:
 
 static blk_status_t t10_pi_type1_generate_crc(struct blk_integrity_iter *iter)
 {
-	return t10_pi_generate(iter, t10_pi_crc_fn, 1);
+	return t10_pi_generate(iter, t10_pi_crc_fn, T10_PI_TYPE1_PROTECTION);
 }
 
 static blk_status_t t10_pi_type1_generate_ip(struct blk_integrity_iter *iter)
 {
-	return t10_pi_generate(iter, t10_pi_ip_fn, 1);
+	return t10_pi_generate(iter, t10_pi_ip_fn, T10_PI_TYPE1_PROTECTION);
 }
 
 static blk_status_t t10_pi_type1_verify_crc(struct blk_integrity_iter *iter)
 {
-	return t10_pi_verify(iter, t10_pi_crc_fn, 1);
+	return t10_pi_verify(iter, t10_pi_crc_fn, T10_PI_TYPE1_PROTECTION);
 }
 
 static blk_status_t t10_pi_type1_verify_ip(struct blk_integrity_iter *iter)
 {
-	return t10_pi_verify(iter, t10_pi_ip_fn, 1);
-}
-
-static blk_status_t t10_pi_type3_generate_crc(struct blk_integrity_iter *iter)
-{
-	return t10_pi_generate(iter, t10_pi_crc_fn, 3);
-}
-
-static blk_status_t t10_pi_type3_generate_ip(struct blk_integrity_iter *iter)
-{
-	return t10_pi_generate(iter, t10_pi_ip_fn, 3);
-}
-
-static blk_status_t t10_pi_type3_verify_crc(struct blk_integrity_iter *iter)
-{
-	return t10_pi_verify(iter, t10_pi_crc_fn, 3);
+	return t10_pi_verify(iter, t10_pi_ip_fn, T10_PI_TYPE1_PROTECTION);
 }
 
-static blk_status_t t10_pi_type3_verify_ip(struct blk_integrity_iter *iter)
-{
-	return t10_pi_verify(iter, t10_pi_ip_fn, 3);
-}
-
-const struct blk_integrity_profile t10_pi_type1_crc = {
-	.name			= "T10-DIF-TYPE1-CRC",
-	.generate_fn		= t10_pi_type1_generate_crc,
-	.verify_fn		= t10_pi_type1_verify_crc,
-};
-EXPORT_SYMBOL(t10_pi_type1_crc);
-
-const struct blk_integrity_profile t10_pi_type1_ip = {
-	.name			= "T10-DIF-TYPE1-IP",
-	.generate_fn		= t10_pi_type1_generate_ip,
-	.verify_fn		= t10_pi_type1_verify_ip,
-};
-EXPORT_SYMBOL(t10_pi_type1_ip);
-
-const struct blk_integrity_profile t10_pi_type3_crc = {
-	.name			= "T10-DIF-TYPE3-CRC",
-	.generate_fn		= t10_pi_type3_generate_crc,
-	.verify_fn		= t10_pi_type3_verify_crc,
-};
-EXPORT_SYMBOL(t10_pi_type3_crc);
-
-const struct blk_integrity_profile t10_pi_type3_ip = {
-	.name			= "T10-DIF-TYPE3-IP",
-	.generate_fn		= t10_pi_type3_generate_ip,
-	.verify_fn		= t10_pi_type3_verify_ip,
-};
-EXPORT_SYMBOL(t10_pi_type3_ip);
-
 /**
- * t10_pi_prepare - prepare PI prior submitting request to device
+ * t10_pi_type1_prepare - prepare PI prior submitting request to device
  * @rq:              request with PI that should be prepared
- * @protection_type: PI type (Type 1/Type 2/Type 3)
  *
  * For Type 1/Type 2, the virtual start sector is the one that was
  * originally submitted by the block layer for the ref_tag usage. Due to
  * partitioning, MD/DM cloning, etc. the actual physical start sector is
  * likely to be different. Remap protection information to match the
  * physical LBA.
- *
- * Type 3 does not have a reference tag so no remapping is required.
  */
-void t10_pi_prepare(struct request *rq, u8 protection_type)
+static void t10_pi_type1_prepare(struct request *rq)
 {
 	const int tuple_sz = rq->q->integrity.tuple_size;
 	u32 ref_tag = t10_pi_ref_tag(rq);
 	struct bio *bio;
 
-	if (protection_type == T10_PI_TYPE3_PROTECTION)
-		return;
-
 	__rq_for_each_bio(bio, rq) {
 		struct bio_integrity_payload *bip = bio_integrity(bio);
 		u32 virt = bip_get_seed(bip) & 0xffffffff;
@@ -222,13 +167,11 @@ void t10_pi_prepare(struct request *rq, u8 protection_type)
 		bip->bip_flags |= BIP_MAPPED_INTEGRITY;
 	}
 }
-EXPORT_SYMBOL(t10_pi_prepare);
 
 /**
- * t10_pi_complete - prepare PI prior returning request to the block layer
+ * t10_pi_type1_complete - prepare PI prior returning request to the blk layer
  * @rq:              request with PI that should be prepared
- * @protection_type: PI type (Type 1/Type 2/Type 3)
- * @intervals:       total elements to prepare
+ * @nr_bytes:        total bytes to prepare
  *
  * For Type 1/Type 2, the virtual start sector is the one that was
  * originally submitted by the block layer for the ref_tag usage. Due to
@@ -236,19 +179,14 @@ EXPORT_SYMBOL(t10_pi_prepare);
  * likely to be different. Since the physical start sector was submitted
  * to the device, we should remap it back to virtual values expected by the
  * block layer.
- *
- * Type 3 does not have a reference tag so no remapping is required.
  */
-void t10_pi_complete(struct request *rq, u8 protection_type,
-		     unsigned int intervals)
+static void t10_pi_type1_complete(struct request *rq, unsigned int nr_bytes)
 {
+	unsigned intervals = nr_bytes >> rq->q->integrity.interval_exp;
 	const int tuple_sz = rq->q->integrity.tuple_size;
 	u32 ref_tag = t10_pi_ref_tag(rq);
 	struct bio *bio;
 
-	if (protection_type == T10_PI_TYPE3_PROTECTION)
-		return;
-
 	__rq_for_each_bio(bio, rq) {
 		struct bio_integrity_payload *bip = bio_integrity(bio);
 		u32 virt = bip_get_seed(bip) & 0xffffffff;
@@ -276,4 +214,73 @@ void t10_pi_complete(struct request *rq, u8 protection_type,
 		}
 	}
 }
-EXPORT_SYMBOL(t10_pi_complete);
+
+static blk_status_t t10_pi_type3_generate_crc(struct blk_integrity_iter *iter)
+{
+	return t10_pi_generate(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION);
+}
+
+static blk_status_t t10_pi_type3_generate_ip(struct blk_integrity_iter *iter)
+{
+	return t10_pi_generate(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION);
+}
+
+static blk_status_t t10_pi_type3_verify_crc(struct blk_integrity_iter *iter)
+{
+	return t10_pi_verify(iter, t10_pi_crc_fn, T10_PI_TYPE3_PROTECTION);
+}
+
+static blk_status_t t10_pi_type3_verify_ip(struct blk_integrity_iter *iter)
+{
+	return t10_pi_verify(iter, t10_pi_ip_fn, T10_PI_TYPE3_PROTECTION);
+}
+
+/**
+ * Type 3 does not have a reference tag so no remapping is required.
+ */
+static void t10_pi_type3_prepare(struct request *rq)
+{
+}
+
+/**
+ * Type 3 does not have a reference tag so no remapping is required.
+ */
+static void t10_pi_type3_complete(struct request *rq, unsigned int nr_bytes)
+{
+}
+
+const struct blk_integrity_profile t10_pi_type1_crc = {
+	.name			= "T10-DIF-TYPE1-CRC",
+	.generate_fn		= t10_pi_type1_generate_crc,
+	.verify_fn		= t10_pi_type1_verify_crc,
+	.prepare_fn		= t10_pi_type1_prepare,
+	.complete_fn		= t10_pi_type1_complete,
+};
+EXPORT_SYMBOL(t10_pi_type1_crc);
+
+const struct blk_integrity_profile t10_pi_type1_ip = {
+	.name			= "T10-DIF-TYPE1-IP",
+	.generate_fn		= t10_pi_type1_generate_ip,
+	.verify_fn		= t10_pi_type1_verify_ip,
+	.prepare_fn		= t10_pi_type1_prepare,
+	.complete_fn		= t10_pi_type1_complete,
+};
+EXPORT_SYMBOL(t10_pi_type1_ip);
+
+const struct blk_integrity_profile t10_pi_type3_crc = {
+	.name			= "T10-DIF-TYPE3-CRC",
+	.generate_fn		= t10_pi_type3_generate_crc,
+	.verify_fn		= t10_pi_type3_verify_crc,
+	.prepare_fn		= t10_pi_type3_prepare,
+	.complete_fn		= t10_pi_type3_complete,
+};
+EXPORT_SYMBOL(t10_pi_type3_crc);
+
+const struct blk_integrity_profile t10_pi_type3_ip = {
+	.name			= "T10-DIF-TYPE3-IP",
+	.generate_fn		= t10_pi_type3_generate_ip,
+	.verify_fn		= t10_pi_type3_verify_ip,
+	.prepare_fn		= t10_pi_type3_prepare,
+	.complete_fn		= t10_pi_type3_complete,
+};
+EXPORT_SYMBOL(t10_pi_type3_ip);