1 files changed, 489 insertions, 290 deletions

diff --git a/drivers/target/target_core_iblock.c b/drivers/target/target_core_iblock.c
index 8572eae62da..7e6b857c6b3 100644
--- a/drivers/target/target_core_iblock.c
+++ b/drivers/target/target_core_iblock.c
@@ -4,10 +4,7 @@
  * This file contains the Storage Engine  <-> Linux BlockIO transport
  * specific functions.
  *
- * Copyright (c) 2003, 2004, 2005 PyX Technologies, Inc.
- * Copyright (c) 2005, 2006, 2007 SBE, Inc.
- * Copyright (c) 2007-2010 Rising Tide Systems
- * Copyright (c) 2008-2010 Linux-iSCSI.org
+ * (c) Copyright 2003-2013 Datera, Inc.
  *
  * Nicholas A. Bellinger <nab@kernel.org>
  *
@@ -40,15 +37,23 @@
 #include <linux/module.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_host.h>
+#include <asm/unaligned.h>
 
 #include <target/target_core_base.h>
 #include <target/target_core_backend.h>
 
 #include "target_core_iblock.h"
 
-static struct se_subsystem_api iblock_template;
+#define IBLOCK_MAX_BIO_PER_TASK	 32	/* max # of bios to submit at a time */
+#define IBLOCK_BIO_POOL_SIZE	128
 
-static void iblock_bio_done(struct bio *, int);
+static inline struct iblock_dev *IBLOCK_DEV(struct se_device *dev)
+{
+	return container_of(dev, struct iblock_dev, dev);
+}
+
+
+static struct se_subsystem_api iblock_template;
 
 /*	iblock_attach_hba(): (Part of se_subsystem_api_t template)
  *
@@ -56,117 +61,70 @@ static void iblock_bio_done(struct bio *, int);
  */
 static int iblock_attach_hba(struct se_hba *hba, u32 host_id)
 {
-	struct iblock_hba *ib_host;
-
-	ib_host = kzalloc(sizeof(struct iblock_hba), GFP_KERNEL);
-	if (!ib_host) {
-		pr_err("Unable to allocate memory for"
-				" struct iblock_hba\n");
-		return -ENOMEM;
-	}
-
-	ib_host->iblock_host_id = host_id;
-
-	hba->hba_ptr = ib_host;
-
 	pr_debug("CORE_HBA[%d] - TCM iBlock HBA Driver %s on"
 		" Generic Target Core Stack %s\n", hba->hba_id,
 		IBLOCK_VERSION, TARGET_CORE_MOD_VERSION);
-
-	pr_debug("CORE_HBA[%d] - Attached iBlock HBA: %u to Generic\n",
-		hba->hba_id, ib_host->iblock_host_id);
-
 	return 0;
 }
 
 static void iblock_detach_hba(struct se_hba *hba)
 {
-	struct iblock_hba *ib_host = hba->hba_ptr;
-
-	pr_debug("CORE_HBA[%d] - Detached iBlock HBA: %u from Generic"
-		" Target Core\n", hba->hba_id, ib_host->iblock_host_id);
-
-	kfree(ib_host);
-	hba->hba_ptr = NULL;
 }
 
-static void *iblock_allocate_virtdevice(struct se_hba *hba, const char *name)
+static struct se_device *iblock_alloc_device(struct se_hba *hba, const char *name)
 {
 	struct iblock_dev *ib_dev = NULL;
-	struct iblock_hba *ib_host = hba->hba_ptr;
 
 	ib_dev = kzalloc(sizeof(struct iblock_dev), GFP_KERNEL);
 	if (!ib_dev) {
 		pr_err("Unable to allocate struct iblock_dev\n");
 		return NULL;
 	}
-	ib_dev->ibd_host = ib_host;
 
 	pr_debug( "IBLOCK: Allocated ib_dev for %s\n", name);
 
-	return ib_dev;
+	return &ib_dev->dev;
 }
 
-static struct se_device *iblock_create_virtdevice(
-	struct se_hba *hba,
-	struct se_subsystem_dev *se_dev,
-	void *p)
+static int iblock_configure_device(struct se_device *dev)
 {
-	struct iblock_dev *ib_dev = p;
-	struct se_device *dev;
-	struct se_dev_limits dev_limits;
-	struct block_device *bd = NULL;
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
 	struct request_queue *q;
-	struct queue_limits *limits;
-	u32 dev_flags = 0;
-	int ret = -EINVAL;
+	struct block_device *bd = NULL;
+	struct blk_integrity *bi;
+	fmode_t mode;
+	int ret = -ENOMEM;
 
-	if (!ib_dev) {
-		pr_err("Unable to locate struct iblock_dev parameter\n");
-		return ERR_PTR(ret);
+	if (!(ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)) {
+		pr_err("Missing udev_path= parameters for IBLOCK\n");
+		return -EINVAL;
 	}
-	memset(&dev_limits, 0, sizeof(struct se_dev_limits));
-	/*
-	 * These settings need to be made tunable..
-	 */
-	ib_dev->ibd_bio_set = bioset_create(32, 0);
+
+	ib_dev->ibd_bio_set = bioset_create(IBLOCK_BIO_POOL_SIZE, 0);
 	if (!ib_dev->ibd_bio_set) {
-		pr_err("IBLOCK: Unable to create bioset()\n");
-		return ERR_PTR(-ENOMEM);
+		pr_err("IBLOCK: Unable to create bioset\n");
+		goto out;
 	}
-	pr_debug("IBLOCK: Created bio_set()\n");
-	/*
-	 * iblock_check_configfs_dev_params() ensures that ib_dev->ibd_udev_path
-	 * must already have been set in order for echo 1 > $HBA/$DEV/enable to run.
-	 */
+
 	pr_debug( "IBLOCK: Claiming struct block_device: %s\n",
 			ib_dev->ibd_udev_path);
 
-	bd = blkdev_get_by_path(ib_dev->ibd_udev_path,
-				FMODE_WRITE|FMODE_READ|FMODE_EXCL, ib_dev);
+	mode = FMODE_READ|FMODE_EXCL;
+	if (!ib_dev->ibd_readonly)
+		mode |= FMODE_WRITE;
+
+	bd = blkdev_get_by_path(ib_dev->ibd_udev_path, mode, ib_dev);
 	if (IS_ERR(bd)) {
 		ret = PTR_ERR(bd);
-		goto failed;
+		goto out_free_bioset;
 	}
-	/*
-	 * Setup the local scope queue_limits from struct request_queue->limits
-	 * to pass into transport_add_device_to_core_hba() as struct se_dev_limits.
-	 */
-	q = bdev_get_queue(bd);
-	limits = &dev_limits.limits;
-	limits->logical_block_size = bdev_logical_block_size(bd);
-	limits->max_hw_sectors = queue_max_hw_sectors(q);
-	limits->max_sectors = queue_max_sectors(q);
-	dev_limits.hw_queue_depth = q->nr_requests;
-	dev_limits.queue_depth = q->nr_requests;
-
 	ib_dev->ibd_bd = bd;
 
-	dev = transport_add_device_to_core_hba(hba,
-			&iblock_template, se_dev, dev_flags, ib_dev,
-			&dev_limits, "IBLOCK", IBLOCK_VERSION);
-	if (!dev)
-		goto failed;
+	q = bdev_get_queue(bd);
+
+	dev->dev_attrib.hw_block_size = bdev_logical_block_size(bd);
+	dev->dev_attrib.hw_max_sectors = UINT_MAX;
+	dev->dev_attrib.hw_queue_depth = q->nr_requests;
 
 	/*
 	 * Check if the underlying struct block_device request_queue supports
@@ -174,64 +132,81 @@ static struct se_device *iblock_create_virtdevice(
 	 * in ATA and we need to set TPE=1
 	 */
 	if (blk_queue_discard(q)) {
-		dev->se_sub_dev->se_dev_attrib.max_unmap_lba_count =
+		dev->dev_attrib.max_unmap_lba_count =
 				q->limits.max_discard_sectors;
+
 		/*
 		 * Currently hardcoded to 1 in Linux/SCSI code..
 		 */
-		dev->se_sub_dev->se_dev_attrib.max_unmap_block_desc_count = 1;
-		dev->se_sub_dev->se_dev_attrib.unmap_granularity =
+		dev->dev_attrib.max_unmap_block_desc_count = 1;
+		dev->dev_attrib.unmap_granularity =
 				q->limits.discard_granularity >> 9;
-		dev->se_sub_dev->se_dev_attrib.unmap_granularity_alignment =
+		dev->dev_attrib.unmap_granularity_alignment =
 				q->limits.discard_alignment;
 
 		pr_debug("IBLOCK: BLOCK Discard support available,"
 				" disabled by default\n");
 	}
+	/*
+	 * Enable write same emulation for IBLOCK and use 0xFFFF as
+	 * the smaller WRITE_SAME(10) only has a two-byte block count.
+	 */
+	dev->dev_attrib.max_write_same_len = 0xFFFF;
 
 	if (blk_queue_nonrot(q))
-		dev->se_sub_dev->se_dev_attrib.is_nonrot = 1;
+		dev->dev_attrib.is_nonrot = 1;
+
+	bi = bdev_get_integrity(bd);
+	if (bi) {
+		struct bio_set *bs = ib_dev->ibd_bio_set;
+
+		if (!strcmp(bi->name, "T10-DIF-TYPE3-IP") ||
+		    !strcmp(bi->name, "T10-DIF-TYPE1-IP")) {
+			pr_err("IBLOCK export of blk_integrity: %s not"
+			       " supported\n", bi->name);
+			ret = -ENOSYS;
+			goto out_blkdev_put;
+		}
 
-	return dev;
+		if (!strcmp(bi->name, "T10-DIF-TYPE3-CRC")) {
+			dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE3_PROT;
+		} else if (!strcmp(bi->name, "T10-DIF-TYPE1-CRC")) {
+			dev->dev_attrib.pi_prot_type = TARGET_DIF_TYPE1_PROT;
+		}
 
-failed:
-	if (ib_dev->ibd_bio_set) {
-		bioset_free(ib_dev->ibd_bio_set);
-		ib_dev->ibd_bio_set = NULL;
+		if (dev->dev_attrib.pi_prot_type) {
+			if (bioset_integrity_create(bs, IBLOCK_BIO_POOL_SIZE) < 0) {
+				pr_err("Unable to allocate bioset for PI\n");
+				ret = -ENOMEM;
+				goto out_blkdev_put;
+			}
+			pr_debug("IBLOCK setup BIP bs->bio_integrity_pool: %p\n",
+				 bs->bio_integrity_pool);
+		}
+		dev->dev_attrib.hw_pi_prot_type = dev->dev_attrib.pi_prot_type;
 	}
-	ib_dev->ibd_bd = NULL;
-	return ERR_PTR(ret);
+
+	return 0;
+
+out_blkdev_put:
+	blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
+out_free_bioset:
+	bioset_free(ib_dev->ibd_bio_set);
+	ib_dev->ibd_bio_set = NULL;
+out:
+	return ret;
 }
 
-static void iblock_free_device(void *p)
+static void iblock_free_device(struct se_device *dev)
 {
-	struct iblock_dev *ib_dev = p;
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
 
 	if (ib_dev->ibd_bd != NULL)
 		blkdev_put(ib_dev->ibd_bd, FMODE_WRITE|FMODE_READ|FMODE_EXCL);
 	if (ib_dev->ibd_bio_set != NULL)
 		bioset_free(ib_dev->ibd_bio_set);
-	kfree(ib_dev);
-}
 
-static inline struct iblock_req *IBLOCK_REQ(struct se_task *task)
-{
-	return container_of(task, struct iblock_req, ib_task);
-}
-
-static struct se_task *
-iblock_alloc_task(unsigned char *cdb)
-{
-	struct iblock_req *ib_req;
-
-	ib_req = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
-	if (!ib_req) {
-		pr_err("Unable to allocate memory for struct iblock_req\n");
-		return NULL;
-	}
-
-	atomic_set(&ib_req->ib_bio_cnt, 0);
-	return &ib_req->ib_task;
+	kfree(ib_dev);
 }
 
 static unsigned long long iblock_emulate_read_cap_with_block_size(
@@ -243,12 +218,12 @@ static unsigned long long iblock_emulate_read_cap_with_block_size(
 					bdev_logical_block_size(bd)) - 1);
 	u32 block_size = bdev_logical_block_size(bd);
 
-	if (block_size == dev->se_sub_dev->se_dev_attrib.block_size)
+	if (block_size == dev->dev_attrib.block_size)
 		return blocks_long;
 
 	switch (block_size) {
 	case 4096:
-		switch (dev->se_sub_dev->se_dev_attrib.block_size) {
+		switch (dev->dev_attrib.block_size) {
 		case 2048:
 			blocks_long <<= 1;
 			break;
@@ -262,7 +237,7 @@ static unsigned long long iblock_emulate_read_cap_with_block_size(
 		}
 		break;
 	case 2048:
-		switch (dev->se_sub_dev->se_dev_attrib.block_size) {
+		switch (dev->dev_attrib.block_size) {
 		case 4096:
 			blocks_long >>= 1;
 			break;
@@ -277,7 +252,7 @@ static unsigned long long iblock_emulate_read_cap_with_block_size(
 		}
 		break;
 	case 1024:
-		switch (dev->se_sub_dev->se_dev_attrib.block_size) {
+		switch (dev->dev_attrib.block_size) {
 		case 4096:
 			blocks_long >>= 2;
 			break;
@@ -292,7 +267,7 @@ static unsigned long long iblock_emulate_read_cap_with_block_size(
 		}
 		break;
 	case 512:
-		switch (dev->se_sub_dev->se_dev_attrib.block_size) {
+		switch (dev->dev_attrib.block_size) {
 		case 4096:
 			blocks_long >>= 3;
 			break;
@@ -313,6 +288,87 @@ static unsigned long long iblock_emulate_read_cap_with_block_size(
 	return blocks_long;
 }
 
+static void iblock_complete_cmd(struct se_cmd *cmd)
+{
+	struct iblock_req *ibr = cmd->priv;
+	u8 status;
+
+	if (!atomic_dec_and_test(&ibr->pending))
+		return;
+
+	if (atomic_read(&ibr->ib_bio_err_cnt))
+		status = SAM_STAT_CHECK_CONDITION;
+	else
+		status = SAM_STAT_GOOD;
+
+	target_complete_cmd(cmd, status);
+	kfree(ibr);
+}
+
+static void iblock_bio_done(struct bio *bio, int err)
+{
+	struct se_cmd *cmd = bio->bi_private;
+	struct iblock_req *ibr = cmd->priv;
+
+	/*
+	 * Set -EIO if !BIO_UPTODATE and the passed is still err=0
+	 */
+	if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err)
+		err = -EIO;
+
+	if (err != 0) {
+		pr_err("test_bit(BIO_UPTODATE) failed for bio: %p,"
+			" err: %d\n", bio, err);
+		/*
+		 * Bump the ib_bio_err_cnt and release bio.
+		 */
+		atomic_inc(&ibr->ib_bio_err_cnt);
+		smp_mb__after_atomic();
+	}
+
+	bio_put(bio);
+
+	iblock_complete_cmd(cmd);
+}
+
+static struct bio *
+iblock_get_bio(struct se_cmd *cmd, sector_t lba, u32 sg_num)
+{
+	struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
+	struct bio *bio;
+
+	/*
+	 * Only allocate as many vector entries as the bio code allows us to,
+	 * we'll loop later on until we have handled the whole request.
+	 */
+	if (sg_num > BIO_MAX_PAGES)
+		sg_num = BIO_MAX_PAGES;
+
+	bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
+	if (!bio) {
+		pr_err("Unable to allocate memory for bio\n");
+		return NULL;
+	}
+
+	bio->bi_bdev = ib_dev->ibd_bd;
+	bio->bi_private = cmd;
+	bio->bi_end_io = &iblock_bio_done;
+	bio->bi_iter.bi_sector = lba;
+
+	return bio;
+}
+
+static void iblock_submit_bios(struct bio_list *list, int rw)
+{
+	struct blk_plug plug;
+	struct bio *bio;
+
+	blk_start_plug(&plug);
+	while ((bio = bio_list_pop(list)))
+		submit_bio(rw, bio);
+	blk_finish_plug(&plug);
+}
+
 static void iblock_end_io_flush(struct bio *bio, int err)
 {
 	struct se_cmd *cmd = bio->bi_private;
@@ -320,8 +376,13 @@ static void iblock_end_io_flush(struct bio *bio, int err)
 	if (err)
 		pr_err("IBLOCK: cache flush failed: %d\n", err);
 
-	if (cmd)
-		transport_complete_sync_cache(cmd, err == 0);
+	if (cmd) {
+		if (err)
+			target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
+		else
+			target_complete_cmd(cmd, SAM_STAT_GOOD);
+	}
+
 	bio_put(bio);
 }
 
@@ -329,10 +390,10 @@ static void iblock_end_io_flush(struct bio *bio, int err)
  * Implement SYCHRONIZE CACHE.  Note that we can't handle lba ranges and must
  * always flush the whole cache.
  */
-static void iblock_emulate_sync_cache(struct se_task *task)
+static sense_reason_t
+iblock_execute_sync_cache(struct se_cmd *cmd)
 {
-	struct se_cmd *cmd = task->task_se_cmd;
-	struct iblock_dev *ib_dev = cmd->se_dev->dev_ptr;
+	struct iblock_dev *ib_dev = IBLOCK_DEV(cmd->se_dev);
 	int immed = (cmd->t_task_cdb[1] & 0x2);
 	struct bio *bio;
 
@@ -341,7 +402,7 @@ static void iblock_emulate_sync_cache(struct se_task *task)
 	 * for this SYNCHRONIZE_CACHE op.
 	 */
 	if (immed)
-		transport_complete_sync_cache(cmd, 1);
+		target_complete_cmd(cmd, SAM_STAT_GOOD);
 
 	bio = bio_alloc(GFP_KERNEL, 0);
 	bio->bi_end_io = iblock_end_io_flush;
@@ -349,40 +410,131 @@ static void iblock_emulate_sync_cache(struct se_task *task)
 	if (!immed)
 		bio->bi_private = cmd;
 	submit_bio(WRITE_FLUSH, bio);
+	return 0;
+}
+
+static sense_reason_t
+iblock_do_unmap(struct se_cmd *cmd, void *priv,
+		sector_t lba, sector_t nolb)
+{
+	struct block_device *bdev = priv;
+	int ret;
+
+	ret = blkdev_issue_discard(bdev, lba, nolb, GFP_KERNEL, 0);
+	if (ret < 0) {
+		pr_err("blkdev_issue_discard() failed: %d\n", ret);
+		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+	}
+
+	return 0;
 }
 
-static int iblock_do_discard(struct se_device *dev, sector_t lba, u32 range)
+static sense_reason_t
+iblock_execute_unmap(struct se_cmd *cmd)
 {
-	struct iblock_dev *ibd = dev->dev_ptr;
-	struct block_device *bd = ibd->ibd_bd;
-	int barrier = 0;
+	struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
 
-	return blkdev_issue_discard(bd, lba, range, GFP_KERNEL, barrier);
+	return sbc_execute_unmap(cmd, iblock_do_unmap, bdev);
 }
 
-static void iblock_free_task(struct se_task *task)
+static sense_reason_t
+iblock_execute_write_same_unmap(struct se_cmd *cmd)
 {
-	kfree(IBLOCK_REQ(task));
+	struct block_device *bdev = IBLOCK_DEV(cmd->se_dev)->ibd_bd;
+	sector_t lba = cmd->t_task_lba;
+	sector_t nolb = sbc_get_write_same_sectors(cmd);
+	int ret;
+
+	ret = iblock_do_unmap(cmd, bdev, lba, nolb);
+	if (ret)
+		return ret;
+
+	target_complete_cmd(cmd, GOOD);
+	return 0;
+}
+
+static sense_reason_t
+iblock_execute_write_same(struct se_cmd *cmd)
+{
+	struct iblock_req *ibr;
+	struct scatterlist *sg;
+	struct bio *bio;
+	struct bio_list list;
+	sector_t block_lba = cmd->t_task_lba;
+	sector_t sectors = sbc_get_write_same_sectors(cmd);
+
+	sg = &cmd->t_data_sg[0];
+
+	if (cmd->t_data_nents > 1 ||
+	    sg->length != cmd->se_dev->dev_attrib.block_size) {
+		pr_err("WRITE_SAME: Illegal SGL t_data_nents: %u length: %u"
+			" block_size: %u\n", cmd->t_data_nents, sg->length,
+			cmd->se_dev->dev_attrib.block_size);
+		return TCM_INVALID_CDB_FIELD;
+	}
+
+	ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
+	if (!ibr)
+		goto fail;
+	cmd->priv = ibr;
+
+	bio = iblock_get_bio(cmd, block_lba, 1);
+	if (!bio)
+		goto fail_free_ibr;
+
+	bio_list_init(&list);
+	bio_list_add(&list, bio);
+
+	atomic_set(&ibr->pending, 1);
+
+	while (sectors) {
+		while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
+				!= sg->length) {
+
+			bio = iblock_get_bio(cmd, block_lba, 1);
+			if (!bio)
+				goto fail_put_bios;
+
+			atomic_inc(&ibr->pending);
+			bio_list_add(&list, bio);
+		}
+
+		/* Always in 512 byte units for Linux/Block */
+		block_lba += sg->length >> IBLOCK_LBA_SHIFT;
+		sectors -= 1;
+	}
+
+	iblock_submit_bios(&list, WRITE);
+	return 0;
+
+fail_put_bios:
+	while ((bio = bio_list_pop(&list)))
+		bio_put(bio);
+fail_free_ibr:
+	kfree(ibr);
+fail:
+	return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 }
 
 enum {
-	Opt_udev_path, Opt_force, Opt_err
+	Opt_udev_path, Opt_readonly, Opt_force, Opt_err
 };
 
 static match_table_t tokens = {
 	{Opt_udev_path, "udev_path=%s"},
+	{Opt_readonly, "readonly=%d"},
 	{Opt_force, "force=%d"},
 	{Opt_err, NULL}
 };
 
-static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba,
-					       struct se_subsystem_dev *se_dev,
-					       const char *page, ssize_t count)
+static ssize_t iblock_set_configfs_dev_params(struct se_device *dev,
+		const char *page, ssize_t count)
 {
-	struct iblock_dev *ib_dev = se_dev->se_dev_su_ptr;
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
 	char *orig, *ptr, *arg_p, *opts;
 	substring_t args[MAX_OPT_ARGS];
 	int ret = 0, token;
+	unsigned long tmp_readonly;
 
 	opts = kstrdup(page, GFP_KERNEL);
 	if (!opts)
@@ -403,17 +555,30 @@ static ssize_t iblock_set_configfs_dev_params(struct se_hba *hba,
 				ret = -EEXIST;
 				goto out;
 			}
+			if (match_strlcpy(ib_dev->ibd_udev_path, &args[0],
+				SE_UDEV_PATH_LEN) == 0) {
+				ret = -EINVAL;
+				break;
+			}
+			pr_debug("IBLOCK: Referencing UDEV path: %s\n",
+					ib_dev->ibd_udev_path);
+			ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
+			break;
+		case Opt_readonly:
 			arg_p = match_strdup(&args[0]);
 			if (!arg_p) {
 				ret = -ENOMEM;
 				break;
 			}
-			snprintf(ib_dev->ibd_udev_path, SE_UDEV_PATH_LEN,
-					"%s", arg_p);
+			ret = kstrtoul(arg_p, 0, &tmp_readonly);
 			kfree(arg_p);
-			pr_debug("IBLOCK: Referencing UDEV path: %s\n",
-					ib_dev->ibd_udev_path);
-			ib_dev->ibd_flags |= IBDF_HAS_UDEV_PATH;
+			if (ret < 0) {
+				pr_err("kstrtoul() failed for"
+						" readonly=\n");
+				goto out;
+			}
+			ib_dev->ibd_readonly = tmp_readonly;
+			pr_debug("IBLOCK: readonly: %d\n", ib_dev->ibd_readonly);
 			break;
 		case Opt_force:
 			break;
@@ -427,44 +592,26 @@ out:
 	return (!ret) ? count : ret;
 }
 
-static ssize_t iblock_check_configfs_dev_params(
-	struct se_hba *hba,
-	struct se_subsystem_dev *se_dev)
+static ssize_t iblock_show_configfs_dev_params(struct se_device *dev, char *b)
 {
-	struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
-
-	if (!(ibd->ibd_flags & IBDF_HAS_UDEV_PATH)) {
-		pr_err("Missing udev_path= parameters for IBLOCK\n");
-		return -EINVAL;
-	}
-
-	return 0;
-}
-
-static ssize_t iblock_show_configfs_dev_params(
-	struct se_hba *hba,
-	struct se_subsystem_dev *se_dev,
-	char *b)
-{
-	struct iblock_dev *ibd = se_dev->se_dev_su_ptr;
-	struct block_device *bd = ibd->ibd_bd;
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
+	struct block_device *bd = ib_dev->ibd_bd;
 	char buf[BDEVNAME_SIZE];
 	ssize_t bl = 0;
 
 	if (bd)
 		bl += sprintf(b + bl, "iBlock device: %s",
 				bdevname(bd, buf));
-	if (ibd->ibd_flags & IBDF_HAS_UDEV_PATH) {
-		bl += sprintf(b + bl, "  UDEV PATH: %s\n",
-				ibd->ibd_udev_path);
-	} else
-		bl += sprintf(b + bl, "\n");
+	if (ib_dev->ibd_flags & IBDF_HAS_UDEV_PATH)
+		bl += sprintf(b + bl, "  UDEV PATH: %s",
+				ib_dev->ibd_udev_path);
+	bl += sprintf(b + bl, "  readonly: %d\n", ib_dev->ibd_readonly);
 
 	bl += sprintf(b + bl, "        ");
 	if (bd) {
 		bl += sprintf(b + bl, "Major: %d Minor: %d  %s\n",
 			MAJOR(bd->bd_dev), MINOR(bd->bd_dev), (!bd->bd_contains) ?
-			"" : (bd->bd_holder == ibd) ?
+			"" : (bd->bd_holder == ib_dev) ?
 			"CLAIMED: IBLOCK" : "CLAIMED: OS");
 	} else {
 		bl += sprintf(b + bl, "Major: 0 Minor: 0\n");
@@ -473,107 +620,128 @@ static ssize_t iblock_show_configfs_dev_params(
 	return bl;
 }
 
-static void iblock_bio_destructor(struct bio *bio)
+static int
+iblock_alloc_bip(struct se_cmd *cmd, struct bio *bio)
 {
-	struct se_task *task = bio->bi_private;
-	struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr;
+	struct se_device *dev = cmd->se_dev;
+	struct blk_integrity *bi;
+	struct bio_integrity_payload *bip;
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
+	struct scatterlist *sg;
+	int i, rc;
 
-	bio_free(bio, ib_dev->ibd_bio_set);
-}
+	bi = bdev_get_integrity(ib_dev->ibd_bd);
+	if (!bi) {
+		pr_err("Unable to locate bio_integrity\n");
+		return -ENODEV;
+	}
 
-static struct bio *
-iblock_get_bio(struct se_task *task, sector_t lba, u32 sg_num)
-{
-	struct iblock_dev *ib_dev = task->task_se_cmd->se_dev->dev_ptr;
-	struct iblock_req *ib_req = IBLOCK_REQ(task);
-	struct bio *bio;
+	bip = bio_integrity_alloc(bio, GFP_NOIO, cmd->t_prot_nents);
+	if (!bip) {
+		pr_err("Unable to allocate bio_integrity_payload\n");
+		return -ENOMEM;
+	}
 
-	/*
-	 * Only allocate as many vector entries as the bio code allows us to,
-	 * we'll loop later on until we have handled the whole request.
-	 */
-	if (sg_num > BIO_MAX_PAGES)
-		sg_num = BIO_MAX_PAGES;
+	bip->bip_iter.bi_size = (cmd->data_length / dev->dev_attrib.block_size) *
+			 dev->prot_length;
+	bip->bip_iter.bi_sector = bio->bi_iter.bi_sector;
 
-	bio = bio_alloc_bioset(GFP_NOIO, sg_num, ib_dev->ibd_bio_set);
-	if (!bio) {
-		pr_err("Unable to allocate memory for bio\n");
-		return NULL;
-	}
+	pr_debug("IBLOCK BIP Size: %u Sector: %llu\n", bip->bip_iter.bi_size,
+		 (unsigned long long)bip->bip_iter.bi_sector);
 
-	pr_debug("Allocated bio: %p task_sg_nents: %u using ibd_bio_set:"
-		" %p\n", bio, task->task_sg_nents, ib_dev->ibd_bio_set);
-	pr_debug("Allocated bio: %p task_size: %u\n", bio, task->task_size);
+	for_each_sg(cmd->t_prot_sg, sg, cmd->t_prot_nents, i) {
 
-	bio->bi_bdev = ib_dev->ibd_bd;
-	bio->bi_private = task;
-	bio->bi_destructor = iblock_bio_destructor;
-	bio->bi_end_io = &iblock_bio_done;
-	bio->bi_sector = lba;
-	atomic_inc(&ib_req->ib_bio_cnt);
+		rc = bio_integrity_add_page(bio, sg_page(sg), sg->length,
+					    sg->offset);
+		if (rc != sg->length) {
+			pr_err("bio_integrity_add_page() failed; %d\n", rc);
+			return -ENOMEM;
+		}
 
-	pr_debug("Set bio->bi_sector: %llu\n", (unsigned long long)bio->bi_sector);
-	pr_debug("Set ib_req->ib_bio_cnt: %d\n",
-			atomic_read(&ib_req->ib_bio_cnt));
-	return bio;
+		pr_debug("Added bio integrity page: %p length: %d offset; %d\n",
+			 sg_page(sg), sg->length, sg->offset);
+	}
+
+	return 0;
 }
 
-static int iblock_do_task(struct se_task *task)
+static sense_reason_t
+iblock_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
+		  enum dma_data_direction data_direction)
 {
-	struct se_cmd *cmd = task->task_se_cmd;
 	struct se_device *dev = cmd->se_dev;
-	struct bio *bio;
+	struct iblock_req *ibr;
+	struct bio *bio, *bio_start;
 	struct bio_list list;
 	struct scatterlist *sg;
-	u32 i, sg_num = task->task_sg_nents;
+	u32 sg_num = sgl_nents;
 	sector_t block_lba;
-	struct blk_plug plug;
-	int rw;
+	unsigned bio_cnt;
+	int rw = 0;
+	int i;
 
-	if (task->task_data_direction == DMA_TO_DEVICE) {
+	if (data_direction == DMA_TO_DEVICE) {
+		struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
+		struct request_queue *q = bdev_get_queue(ib_dev->ibd_bd);
 		/*
-		 * Force data to disk if we pretend to not have a volatile
-		 * write cache, or the initiator set the Force Unit Access bit.
+		 * Force writethrough using WRITE_FUA if a volatile write cache
+		 * is not enabled, or if initiator set the Force Unit Access bit.
 		 */
-		if (dev->se_sub_dev->se_dev_attrib.emulate_write_cache == 0 ||
-		    (dev->se_sub_dev->se_dev_attrib.emulate_fua_write > 0 &&
-		     (cmd->se_cmd_flags & SCF_FUA)))
-			rw = WRITE_FUA;
-		else
+		if (q->flush_flags & REQ_FUA) {
+			if (cmd->se_cmd_flags & SCF_FUA)
+				rw = WRITE_FUA;
+			else if (!(q->flush_flags & REQ_FLUSH))
+				rw = WRITE_FUA;
+			else
+				rw = WRITE;
+		} else {
 			rw = WRITE;
+		}
 	} else {
 		rw = READ;
 	}
 
 	/*
-	 * Do starting conversion up from non 512-byte blocksize with
-	 * struct se_task SCSI blocksize into Linux/Block 512 units for BIO.
+	 * Convert the blocksize advertised to the initiator to the 512 byte
+	 * units unconditionally used by the Linux block layer.
 	 */
-	if (dev->se_sub_dev->se_dev_attrib.block_size == 4096)
-		block_lba = (task->task_lba << 3);
-	else if (dev->se_sub_dev->se_dev_attrib.block_size == 2048)
-		block_lba = (task->task_lba << 2);
-	else if (dev->se_sub_dev->se_dev_attrib.block_size == 1024)
-		block_lba = (task->task_lba << 1);
-	else if (dev->se_sub_dev->se_dev_attrib.block_size == 512)
-		block_lba = task->task_lba;
+	if (dev->dev_attrib.block_size == 4096)
+		block_lba = (cmd->t_task_lba << 3);
+	else if (dev->dev_attrib.block_size == 2048)
+		block_lba = (cmd->t_task_lba << 2);
+	else if (dev->dev_attrib.block_size == 1024)
+		block_lba = (cmd->t_task_lba << 1);
+	else if (dev->dev_attrib.block_size == 512)
+		block_lba = cmd->t_task_lba;
 	else {
 		pr_err("Unsupported SCSI -> BLOCK LBA conversion:"
-				" %u\n", dev->se_sub_dev->se_dev_attrib.block_size);
-		cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-		return -ENOSYS;
+				" %u\n", dev->dev_attrib.block_size);
+		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 	}
 
-	bio = iblock_get_bio(task, block_lba, sg_num);
-	if (!bio) {
-		cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-		return -ENOMEM;
+	ibr = kzalloc(sizeof(struct iblock_req), GFP_KERNEL);
+	if (!ibr)
+		goto fail;
+	cmd->priv = ibr;
+
+	if (!sgl_nents) {
+		atomic_set(&ibr->pending, 1);
+		iblock_complete_cmd(cmd);
+		return 0;
 	}
 
+	bio = iblock_get_bio(cmd, block_lba, sgl_nents);
+	if (!bio)
+		goto fail_free_ibr;
+
+	bio_start = bio;
 	bio_list_init(&list);
 	bio_list_add(&list, bio);
 
-	for_each_sg(task->task_sg, sg, task->task_sg_nents, i) {
+	atomic_set(&ibr->pending, 2);
+	bio_cnt = 1;
+
+	for_each_sg(sgl, sg, sgl_nents, i) {
 		/*
 		 * XXX: if the length the device accepts is shorter than the
 		 *	length of the S/G list entry this will cause and
@@ -581,10 +749,18 @@ static int iblock_do_task(struct se_task *task)
 		 */
 		while (bio_add_page(bio, sg_page(sg), sg->length, sg->offset)
 				!= sg->length) {
-			bio = iblock_get_bio(task, block_lba, sg_num);
+			if (bio_cnt >= IBLOCK_MAX_BIO_PER_TASK) {
+				iblock_submit_bios(&list, rw);
+				bio_cnt = 0;
+			}
+
+			bio = iblock_get_bio(cmd, block_lba, sg_num);
 			if (!bio)
-				goto fail;
+				goto fail_put_bios;
+
+			atomic_inc(&ibr->pending);
 			bio_list_add(&list, bio);
+			bio_cnt++;
 		}
 
 		/* Always in 512 byte units for Linux/Block */
@@ -592,94 +768,117 @@ static int iblock_do_task(struct se_task *task)
 		sg_num--;
 	}
 
-	blk_start_plug(&plug);
-	while ((bio = bio_list_pop(&list)))
-		submit_bio(rw, bio);
-	blk_finish_plug(&plug);
+	if (cmd->prot_type) {
+		int rc = iblock_alloc_bip(cmd, bio_start);
+		if (rc)
+			goto fail_put_bios;
+	}
 
+	iblock_submit_bios(&list, rw);
+	iblock_complete_cmd(cmd);
 	return 0;
 
-fail:
+fail_put_bios:
 	while ((bio = bio_list_pop(&list)))
 		bio_put(bio);
-	cmd->scsi_sense_reason = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
-	return -ENOMEM;
+fail_free_ibr:
+	kfree(ibr);
+fail:
+	return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 }
 
-static u32 iblock_get_device_rev(struct se_device *dev)
+static sector_t iblock_get_blocks(struct se_device *dev)
 {
-	return SCSI_SPC_2; /* Returns SPC-3 in Initiator Data */
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
+	struct block_device *bd = ib_dev->ibd_bd;
+	struct request_queue *q = bdev_get_queue(bd);
+
+	return iblock_emulate_read_cap_with_block_size(dev, bd, q);
 }
 
-static u32 iblock_get_device_type(struct se_device *dev)
+static sector_t iblock_get_alignment_offset_lbas(struct se_device *dev)
 {
-	return TYPE_DISK;
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
+	struct block_device *bd = ib_dev->ibd_bd;
+	int ret;
+
+	ret = bdev_alignment_offset(bd);
+	if (ret == -1)
+		return 0;
+
+	/* convert offset-bytes to offset-lbas */
+	return ret / bdev_logical_block_size(bd);
 }
 
-static sector_t iblock_get_blocks(struct se_device *dev)
+static unsigned int iblock_get_lbppbe(struct se_device *dev)
 {
-	struct iblock_dev *ibd = dev->dev_ptr;
-	struct block_device *bd = ibd->ibd_bd;
-	struct request_queue *q = bdev_get_queue(bd);
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
+	struct block_device *bd = ib_dev->ibd_bd;
+	int logs_per_phys = bdev_physical_block_size(bd) / bdev_logical_block_size(bd);
 
-	return iblock_emulate_read_cap_with_block_size(dev, bd, q);
+	return ilog2(logs_per_phys);
 }
 
-static void iblock_bio_done(struct bio *bio, int err)
+static unsigned int iblock_get_io_min(struct se_device *dev)
 {
-	struct se_task *task = bio->bi_private;
-	struct iblock_req *ibr = IBLOCK_REQ(task);
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
+	struct block_device *bd = ib_dev->ibd_bd;
 
-	/*
-	 * Set -EIO if !BIO_UPTODATE and the passed is still err=0
-	 */
-	if (!test_bit(BIO_UPTODATE, &bio->bi_flags) && !err)
-		err = -EIO;
+	return bdev_io_min(bd);
+}
 
-	if (err != 0) {
-		pr_err("test_bit(BIO_UPTODATE) failed for bio: %p,"
-			" err: %d\n", bio, err);
-		/*
-		 * Bump the ib_bio_err_cnt and release bio.
-		 */
-		atomic_inc(&ibr->ib_bio_err_cnt);
-		smp_mb__after_atomic_inc();
-	}
+static unsigned int iblock_get_io_opt(struct se_device *dev)
+{
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
+	struct block_device *bd = ib_dev->ibd_bd;
 
-	bio_put(bio);
+	return bdev_io_opt(bd);
+}
 
-	if (!atomic_dec_and_test(&ibr->ib_bio_cnt))
-		return;
+static struct sbc_ops iblock_sbc_ops = {
+	.execute_rw		= iblock_execute_rw,
+	.execute_sync_cache	= iblock_execute_sync_cache,
+	.execute_write_same	= iblock_execute_write_same,
+	.execute_write_same_unmap = iblock_execute_write_same_unmap,
+	.execute_unmap		= iblock_execute_unmap,
+};
+
+static sense_reason_t
+iblock_parse_cdb(struct se_cmd *cmd)
+{
+	return sbc_parse_cdb(cmd, &iblock_sbc_ops);
+}
 
-	pr_debug("done[%p] bio: %p task_lba: %llu bio_lba: %llu err=%d\n",
-		 task, bio, task->task_lba,
-		 (unsigned long long)bio->bi_sector, err);
+static bool iblock_get_write_cache(struct se_device *dev)
+{
+	struct iblock_dev *ib_dev = IBLOCK_DEV(dev);
+	struct block_device *bd = ib_dev->ibd_bd;
+	struct request_queue *q = bdev_get_queue(bd);
 
-	transport_complete_task(task, !atomic_read(&ibr->ib_bio_err_cnt));
+	return q->flush_flags & REQ_FLUSH;
 }
 
 static struct se_subsystem_api iblock_template = {
 	.name			= "iblock",
+	.inquiry_prod		= "IBLOCK",
+	.inquiry_rev		= IBLOCK_VERSION,
 	.owner			= THIS_MODULE,
 	.transport_type		= TRANSPORT_PLUGIN_VHBA_PDEV,
-	.write_cache_emulated	= 1,
-	.fua_write_emulated	= 1,
 	.attach_hba		= iblock_attach_hba,
 	.detach_hba		= iblock_detach_hba,
-	.allocate_virtdevice	= iblock_allocate_virtdevice,
-	.create_virtdevice	= iblock_create_virtdevice,
+	.alloc_device		= iblock_alloc_device,
+	.configure_device	= iblock_configure_device,
 	.free_device		= iblock_free_device,
-	.alloc_task		= iblock_alloc_task,
-	.do_task		= iblock_do_task,
-	.do_discard		= iblock_do_discard,
-	.do_sync_cache		= iblock_emulate_sync_cache,
-	.free_task		= iblock_free_task,
-	.check_configfs_dev_params = iblock_check_configfs_dev_params,
+	.parse_cdb		= iblock_parse_cdb,
 	.set_configfs_dev_params = iblock_set_configfs_dev_params,
 	.show_configfs_dev_params = iblock_show_configfs_dev_params,
-	.get_device_rev		= iblock_get_device_rev,
-	.get_device_type	= iblock_get_device_type,
+	.get_device_type	= sbc_get_device_type,
 	.get_blocks		= iblock_get_blocks,
+	.get_alignment_offset_lbas = iblock_get_alignment_offset_lbas,
+	.get_lbppbe		= iblock_get_lbppbe,
+	.get_io_min		= iblock_get_io_min,
+	.get_io_opt		= iblock_get_io_opt,
+	.get_write_cache	= iblock_get_write_cache,
 };
 
 static int __init iblock_module_init(void)
@@ -687,7 +886,7 @@ static int __init iblock_module_init(void)
 	return transport_subsystem_register(&iblock_template);
 }
 
-static void iblock_module_exit(void)
+static void __exit iblock_module_exit(void)
 {
 	transport_subsystem_release(&iblock_template);
 }