Message-Id: <1453811633-3721-2-git-send-email-ww.tao0320@gmail.com>
Date:	Tue, 26 Jan 2016 20:33:53 +0800
From:	Wenwei Tao <ww.tao0320@...il.com>
To:	mb@...htnvm.io
Cc:	linux-kernel@...r.kernel.org, linux-block@...r.kernel.org
Subject: [PATCH v2 2/2] lightnvm: add non-continuous lun target creation support

When create a target, we specify the begin lunid and
the end lunid, and get the corresponding continuous
luns from media manager, if one of the luns is not free,
we failed to create the target, even if the device's
total free luns are enough.

So add non-continuous lun target creation support,
thus we can improve the backend device's space utilization.
Signed-off-by: Wenwei Tao <ww.tao0320@...il.com>
---
Changes since v1:
-use NVM_FIXED instead NVM_C_FIXED in gennvm_get_lun
-add target creation flags check
-rebase to v4.5-rc1
 
 drivers/lightnvm/core.c       |  36 ++++---
 drivers/lightnvm/gennvm.c     |  42 ++++++++-
 drivers/lightnvm/rrpc.c       | 215 +++++++++++++++++++++++++++---------------
 drivers/lightnvm/rrpc.h       |   6 +-
 include/linux/lightnvm.h      |  24 ++++-
 include/uapi/linux/lightnvm.h |   3 +
 6 files changed, 229 insertions(+), 97 deletions(-)

diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
index 27a59e8..7de5855 100644
--- a/drivers/lightnvm/core.c
+++ b/drivers/lightnvm/core.c
@@ -28,7 +28,6 @@
 #include <linux/miscdevice.h>
 #include <linux/lightnvm.h>
 #include <linux/sched/sysctl.h>
-#include <uapi/linux/lightnvm.h>
 
 static LIST_HEAD(nvm_targets);
 static LIST_HEAD(nvm_mgrs);
@@ -468,6 +467,11 @@ static int nvm_core_init(struct nvm_dev *dev)
 				dev->luns_per_chnl *
 				dev->nr_chnls;
 	dev->total_pages = dev->total_blocks * dev->pgs_per_blk;
+	dev->lun_map = kcalloc(BITS_TO_LONGS(dev->nr_luns),
+			sizeof(unsigned long), GFP_KERNEL);
+	if (!dev->lun_map)
+		return -ENOMEM;
+
 	INIT_LIST_HEAD(&dev->online_targets);
 	mutex_init(&dev->mlock);
 	spin_lock_init(&dev->lock);
@@ -610,6 +614,7 @@ void nvm_unregister(char *disk_name)
 	up_write(&nvm_lock);
 
 	nvm_exit(dev);
+	kfree(dev->lun_map);
 	kfree(dev);
 }
 EXPORT_SYMBOL(nvm_unregister);
@@ -626,6 +631,7 @@ static int nvm_create_target(struct nvm_dev *dev,
 	struct gendisk *tdisk;
 	struct nvm_tgt_type *tt;
 	struct nvm_target *t;
+	unsigned long flags;
 	void *targetdata;
 
 	if (!dev->mt) {
@@ -670,7 +676,8 @@ static int nvm_create_target(struct nvm_dev *dev,
 	tdisk->fops = &nvm_fops;
 	tdisk->queue = tqueue;
 
-	targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end);
+	flags = calc_nvm_create_bits(create->flags);
+	targetdata = tt->init(dev, tdisk, s->lun_begin, s->lun_end, flags);
 	if (IS_ERR(targetdata))
 		goto err_init;
 
@@ -736,6 +743,15 @@ static int __nvm_configure_create(struct nvm_ioctl_create *create)
 		pr_err("nvm: config type not valid\n");
 		return -EINVAL;
 	}
+
+	if (create->flags) {
+		if (!(create->flags & NVM_C_FLAGS) ||
+			(create->flags & ~NVM_C_FLAGS)) {
+			pr_err("nvm: create flags not supported\n");
+			return -EINVAL;
+		}
+	}
+
 	s = &create->conf.s;
 
 	if (s->lun_begin > s->lun_end || s->lun_end > dev->nr_luns) {
@@ -824,15 +840,14 @@ static int nvm_configure_create(const char *val)
 	char opcode;
 	int lun_begin, lun_end, ret;
 
-	ret = sscanf(val, "%c %256s %256s %48s %u:%u", &opcode, create.dev,
-						create.tgtname, create.tgttype,
-						&lun_begin, &lun_end);
-	if (ret != 6) {
-		pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end\".\n");
+	ret = sscanf(val, "%c %256s %256s %48s %u:%u %u", &opcode, create.dev,
+					create.tgtname, create.tgttype,
+					&lun_begin, &lun_end, &create.flags);
+	if (ret != 7) {
+		pr_err("nvm: invalid command. Use \"opcode device name tgttype lun_begin:lun_end flags\".\n");
 		return -EINVAL;
 	}
 
-	create.flags = 0;
 	create.conf.type = NVM_CONFIG_TYPE_SIMPLE;
 	create.conf.s.lun_begin = lun_begin;
 	create.conf.s.lun_end = lun_end;
@@ -1002,11 +1017,6 @@ static long nvm_ioctl_dev_create(struct file *file, void __user *arg)
 	create.tgttype[NVM_TTYPE_NAME_MAX - 1] = '\0';
 	create.tgtname[DISK_NAME_LEN - 1] = '\0';
 
-	if (create.flags != 0) {
-		pr_err("nvm: no flags supported\n");
-		return -EINVAL;
-	}
-
 	return __nvm_configure_create(&create);
 }
 
diff --git a/drivers/lightnvm/gennvm.c b/drivers/lightnvm/gennvm.c
index 34ea4ff..0400390 100644
--- a/drivers/lightnvm/gennvm.c
+++ b/drivers/lightnvm/gennvm.c
@@ -185,6 +185,9 @@ static int gennvm_block_map(u64 slba, u32 nlb, __le64 *entries, void *private)
 		lun_id = div_u64(pba, dev->sec_per_lun);
 		lun = &gn->luns[lun_id];
 
+		if (!test_bit(lun_id, dev->lun_map))
+			__set_bit(lun_id, dev->lun_map);
+
 		/* Calculate block offset into lun */
 		pba = pba - (dev->sec_per_lun * lun_id);
 		blk = &lun->vlun.blocks[div_u64(pba, dev->sec_per_blk)];
@@ -475,11 +478,45 @@ static int gennvm_erase_blk(struct nvm_dev *dev, struct nvm_block *blk,
 	return nvm_erase_ppa(dev, &addr, 1);
 }
 
-static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid)
+static struct nvm_lun *gennvm_get_lun(struct nvm_dev *dev, int lunid,
+						unsigned long flags)
 {
 	struct gen_nvm *gn = dev->mp;
+	unsigned long *lun_map = dev->lun_map;
+	struct nvm_lun *lun =  NULL;
+	int id;
+
+	if (WARN_ON(lunid >= dev->nr_luns))
+		return NULL;
+
+	if (flags & NVM_NOALLOC)
+		return &gn->luns[lunid].vlun;
+
+	spin_lock(&dev->lock);
+	if (flags & NVM_FIXED) {
+		if (test_and_set_bit(lunid, lun_map)) {
+			pr_err("gennvm: lun %u is inuse\n", lunid);
+			goto out;
+		} else {
+			lun = &gn->luns[lunid].vlun;
+			goto out;
+		}
+	}
+	id = find_next_zero_bit(lun_map, dev->nr_luns, 0);
+	if (id < dev->nr_luns) {
+		__set_bit(id, lun_map);
+		lun =  &gn->luns[id].vlun;
+	} else
+		pr_err("gennvm: dev %s has no free luns\n", dev->name);
+
+out:
+	spin_unlock(&dev->lock);
+	return lun;
+}
 
-	return &gn->luns[lunid].vlun;
+static inline void gennvm_put_lun(struct nvm_dev *dev, int lunid)
+{
+	WARN_ON(!test_and_clear_bit(lunid, dev->lun_map));
 }
 
 static void gennvm_lun_info_print(struct nvm_dev *dev)
@@ -520,6 +557,7 @@ static struct nvmm_type gennvm = {
 	.erase_blk		= gennvm_erase_blk,
 
 	.get_lun		= gennvm_get_lun,
+	.put_lun		= gennvm_put_lun,
 	.lun_info_print		= gennvm_lun_info_print,
 
 	.get_area		= gennvm_get_area,
diff --git a/drivers/lightnvm/rrpc.c b/drivers/lightnvm/rrpc.c
index c8c27f9..59bca9c 100644
--- a/drivers/lightnvm/rrpc.c
+++ b/drivers/lightnvm/rrpc.c
@@ -23,28 +23,35 @@ static int rrpc_submit_io(struct rrpc *rrpc, struct bio *bio,
 				struct nvm_rq *rqd, unsigned long flags);
 
 #define rrpc_for_each_lun(rrpc, rlun, i) \
-		for ((i) = 0, rlun = &(rrpc)->luns[0]; \
-			(i) < (rrpc)->nr_luns; (i)++, rlun = &(rrpc)->luns[(i)])
+	for ((i) = 0, rlun = &(rrpc)->luns[0]; \
+		(i) < (rrpc)->nr_luns; (i)++, rlun = &(rrpc)->luns[(i)])
+
+static inline u64 lun_poffset(struct nvm_lun *lun, struct nvm_dev *dev)
+{
+	return lun->id * dev->sec_per_lun;
+}
 
 static void rrpc_page_invalidate(struct rrpc *rrpc, struct rrpc_addr *a)
 {
 	struct rrpc_block *rblk = a->rblk;
-	unsigned int pg_offset;
+	struct rrpc_lun *rlun = rblk->rlun;
+	u64 pg_offset;
 
-	lockdep_assert_held(&rrpc->rev_lock);
+	lockdep_assert_held(&rlun->rev_lock);
 
 	if (a->addr == ADDR_EMPTY || !rblk)
 		return;
 
 	spin_lock(&rblk->lock);
 
-	div_u64_rem(a->addr, rrpc->dev->pgs_per_blk, &pg_offset);
+	div_u64_rem(a->addr, rrpc->dev->pgs_per_blk, (u32 *)&pg_offset);
 	WARN_ON(test_and_set_bit(pg_offset, rblk->invalid_pages));
 	rblk->nr_invalid_pages++;
 
 	spin_unlock(&rblk->lock);
 
-	rrpc->rev_trans_map[a->addr - rrpc->poffset].addr = ADDR_EMPTY;
+	pg_offset = lun_poffset(rlun->parent, rrpc->dev);
+	rlun->rev_trans_map[a->addr - pg_offset].addr = ADDR_EMPTY;
 }
 
 static void rrpc_invalidate_range(struct rrpc *rrpc, sector_t slba,
@@ -52,14 +59,15 @@ static void rrpc_invalidate_range(struct rrpc *rrpc, sector_t slba,
 {
 	sector_t i;
 
-	spin_lock(&rrpc->rev_lock);
 	for (i = slba; i < slba + len; i++) {
 		struct rrpc_addr *gp = &rrpc->trans_map[i];
+		struct rrpc_lun *rlun = gp->rblk->rlun;
 
+		spin_lock(&rlun->rev_lock);
 		rrpc_page_invalidate(rrpc, gp);
+		spin_unlock(&rlun->rev_lock);
 		gp->rblk = NULL;
 	}
-	spin_unlock(&rrpc->rev_lock);
 }
 
 static struct nvm_rq *rrpc_inflight_laddr_acquire(struct rrpc *rrpc,
@@ -281,13 +289,14 @@ static void rrpc_end_sync_bio(struct bio *bio)
 static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
 {
 	struct request_queue *q = rrpc->dev->q;
+	struct rrpc_lun *rlun = rblk->rlun;
 	struct rrpc_rev_addr *rev;
 	struct nvm_rq *rqd;
 	struct bio *bio;
 	struct page *page;
 	int slot;
 	int nr_pgs_per_blk = rrpc->dev->pgs_per_blk;
-	u64 phys_addr;
+	u64 phys_addr, poffset;
 	DECLARE_COMPLETION_ONSTACK(wait);
 
 	if (bitmap_full(rblk->invalid_pages, nr_pgs_per_blk))
@@ -303,6 +312,7 @@ static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
 	if (!page)
 		return -ENOMEM;
 
+	poffset = lun_poffset(rlun->parent, rrpc->dev);
 	while ((slot = find_first_zero_bit(rblk->invalid_pages,
 					    nr_pgs_per_blk)) < nr_pgs_per_blk) {
 
@@ -310,23 +320,23 @@ static int rrpc_move_valid_pages(struct rrpc *rrpc, struct rrpc_block *rblk)
 		phys_addr = (rblk->parent->id * nr_pgs_per_blk) + slot;
 
 try:
-		spin_lock(&rrpc->rev_lock);
+		spin_lock(&rlun->rev_lock);
 		/* Get logical address from physical to logical table */
-		rev = &rrpc->rev_trans_map[phys_addr - rrpc->poffset];
+		rev = &rlun->rev_trans_map[phys_addr - poffset];
 		/* already updated by previous regular write */
 		if (rev->addr == ADDR_EMPTY) {
-			spin_unlock(&rrpc->rev_lock);
+			spin_unlock(&rlun->rev_lock);
 			continue;
 		}
 
 		rqd = rrpc_inflight_laddr_acquire(rrpc, rev->addr, 1);
 		if (IS_ERR_OR_NULL(rqd)) {
-			spin_unlock(&rrpc->rev_lock);
+			spin_unlock(&rlun->rev_lock);
 			schedule();
 			goto try;
 		}
 
-		spin_unlock(&rrpc->rev_lock);
+		spin_unlock(&rlun->rev_lock);
 
 		/* Perform read to do GC */
 		bio->bi_iter.bi_sector = rrpc_get_sector(rev->addr);
@@ -395,7 +405,7 @@ static void rrpc_block_gc(struct work_struct *work)
 	struct rrpc_block *rblk = gcb->rblk;
 	struct nvm_dev *dev = rrpc->dev;
 	struct nvm_lun *lun = rblk->parent->lun;
-	struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset];
+	struct rrpc_lun *rlun = lun->private;
 
 	mempool_free(gcb, rrpc->gcb_pool);
 	pr_debug("nvm: block '%lu' being reclaimed\n", rblk->parent->id);
@@ -497,7 +507,7 @@ static void rrpc_gc_queue(struct work_struct *work)
 	struct rrpc *rrpc = gcb->rrpc;
 	struct rrpc_block *rblk = gcb->rblk;
 	struct nvm_lun *lun = rblk->parent->lun;
-	struct rrpc_lun *rlun = &rrpc->luns[lun->id - rrpc->lun_offset];
+	struct rrpc_lun *rlun = lun->private;
 
 	spin_lock(&rlun->lock);
 	list_add_tail(&rblk->prio, &rlun->prio_list);
@@ -540,22 +550,24 @@ static struct rrpc_lun *rrpc_get_lun_rr(struct rrpc *rrpc, int is_gc)
 static struct rrpc_addr *rrpc_update_map(struct rrpc *rrpc, sector_t laddr,
 					struct rrpc_block *rblk, u64 paddr)
 {
+	struct rrpc_lun *rlun = rblk->rlun;
 	struct rrpc_addr *gp;
 	struct rrpc_rev_addr *rev;
+	u64 poffset = lun_poffset(rlun->parent, rrpc->dev);
 
 	BUG_ON(laddr >= rrpc->nr_pages);
 
 	gp = &rrpc->trans_map[laddr];
-	spin_lock(&rrpc->rev_lock);
+	spin_lock(&rlun->rev_lock);
 	if (gp->rblk)
 		rrpc_page_invalidate(rrpc, gp);
 
 	gp->addr = paddr;
 	gp->rblk = rblk;
 
-	rev = &rrpc->rev_trans_map[gp->addr - rrpc->poffset];
+	rev = &rlun->rev_trans_map[gp->addr - poffset];
 	rev->addr = laddr;
-	spin_unlock(&rrpc->rev_lock);
+	spin_unlock(&rlun->rev_lock);
 
 	return gp;
 }
@@ -956,8 +968,6 @@ static void rrpc_requeue(struct work_struct *work)
 
 static void rrpc_gc_free(struct rrpc *rrpc)
 {
-	struct rrpc_lun *rlun;
-	int i;
 
 	if (rrpc->krqd_wq)
 		destroy_workqueue(rrpc->krqd_wq);
@@ -965,16 +975,6 @@ static void rrpc_gc_free(struct rrpc *rrpc)
 	if (rrpc->kgc_wq)
 		destroy_workqueue(rrpc->kgc_wq);
 
-	if (!rrpc->luns)
-		return;
-
-	for (i = 0; i < rrpc->nr_luns; i++) {
-		rlun = &rrpc->luns[i];
-
-		if (!rlun->blocks)
-			break;
-		vfree(rlun->blocks);
-	}
 }
 
 static int rrpc_gc_init(struct rrpc *rrpc)
@@ -995,7 +995,6 @@ static int rrpc_gc_init(struct rrpc *rrpc)
 
 static void rrpc_map_free(struct rrpc *rrpc)
 {
-	vfree(rrpc->rev_trans_map);
 	vfree(rrpc->trans_map);
 }
 
@@ -1003,19 +1002,28 @@ static int rrpc_l2p_update(u64 slba, u32 nlb, __le64 *entries, void *private)
 {
 	struct rrpc *rrpc = (struct rrpc *)private;
 	struct nvm_dev *dev = rrpc->dev;
-	struct rrpc_addr *addr = rrpc->trans_map + slba;
-	struct rrpc_rev_addr *raddr = rrpc->rev_trans_map;
+	struct rrpc_addr *addr;
+	struct rrpc_rev_addr *raddr;
 	sector_t max_pages = dev->total_pages * (dev->sec_size >> 9);
-	u64 elba = slba + nlb;
-	u64 i;
+	int page_size = dev->sec_per_pg * dev->sec_size;
+	u64 elba, i;
+
+	elba = slba + nlb;
 
 	if (unlikely(elba > dev->total_pages)) {
 		pr_err("nvm: L2P data from device is out of bounds!\n");
 		return -EINVAL;
 	}
 
+	slba -= rrpc->soffset >> (ilog2(page_size) - 9);
+	addr = rrpc->trans_map + slba;
 	for (i = 0; i < nlb; i++) {
+		struct rrpc_lun *rlun;
+		struct nvm_lun *lun;
 		u64 pba = le64_to_cpu(entries[i]);
+		u64 poffset;
+		int lunid;
+
 		/* LNVM treats address-spaces as silos, LBA and PBA are
 		 * equally large and zero-indexed.
 		 */
@@ -1031,8 +1039,15 @@ static int rrpc_l2p_update(u64 slba, u32 nlb, __le64 *entries, void *private)
 		if (!pba)
 			continue;
 
+		lunid = div_u64(pba, dev->sec_per_lun);
+		lun = dev->mt->get_lun(dev, lunid, NVM_NOALLOC);
+		if (unlikely(!lun))
+			return -EINVAL;
+		rlun = lun->private;
+		raddr = rlun->rev_trans_map;
+		poffset = lun_poffset(lun, dev);
 		addr[i].addr = pba;
-		raddr[pba].addr = slba + i;
+		raddr[pba - poffset].addr = slba + i;
 	}
 
 	return 0;
@@ -1059,17 +1074,11 @@ static int rrpc_map_init(struct rrpc *rrpc)
 	if (!rrpc->trans_map)
 		return -ENOMEM;
 
-	rrpc->rev_trans_map = vmalloc(sizeof(struct rrpc_rev_addr)
-							* rrpc->nr_pages);
-	if (!rrpc->rev_trans_map)
-		return -ENOMEM;
 
 	for (i = 0; i < rrpc->nr_pages; i++) {
 		struct rrpc_addr *p = &rrpc->trans_map[i];
-		struct rrpc_rev_addr *r = &rrpc->rev_trans_map[i];
 
 		p->addr = ADDR_EMPTY;
-		r->addr = ADDR_EMPTY;
 	}
 
 	if (!dev->ops->get_l2p_tbl)
@@ -1140,21 +1149,85 @@ static void rrpc_core_free(struct rrpc *rrpc)
 
 static void rrpc_luns_free(struct rrpc *rrpc)
 {
+	struct nvm_dev *dev = rrpc->dev;
+	struct rrpc_lun *rlun;
+	struct nvm_lun *lun;
+	int i;
+
+	if (!rrpc->luns)
+		return;
+
+	for (i = 0; i < rrpc->nr_luns; i++) {
+		rlun = &rrpc->luns[i];
+		if (!rlun)
+			break;
+		lun = rlun->parent;
+		dev->mt->put_lun(dev, lun->id);
+		vfree(rlun->rev_trans_map);
+		vfree(rlun->blocks);
+	}
 	kfree(rrpc->luns);
+	rrpc->luns = NULL;
+
+}
+
+static int rrpc_lun_init(struct rrpc *rrpc, struct rrpc_lun *rlun,
+			struct nvm_lun *lun)
+{
+	struct nvm_dev *dev = rrpc->dev;
+	int i;
+
+	rlun->rev_trans_map = vmalloc(sizeof(struct rrpc_rev_addr) *
+					dev->sec_per_lun);
+	if (!rlun->rev_trans_map)
+		return -ENOMEM;
+
+	for (i = 0; i < dev->sec_per_lun; i++) {
+		struct rrpc_rev_addr *r = &rlun->rev_trans_map[i];
+
+		r->addr = ADDR_EMPTY;
+	}
+	rlun->blocks = vzalloc(sizeof(struct rrpc_block) * dev->blks_per_lun);
+	if (!rlun->blocks) {
+		vfree(rlun->rev_trans_map);
+		return -ENOMEM;
+	}
+
+	for (i = 0; i < dev->blks_per_lun; i++) {
+		struct rrpc_block *rblk = &rlun->blocks[i];
+		struct nvm_block *blk = &lun->blocks[i];
+
+		rblk->parent = blk;
+		rblk->rlun = rlun;
+		INIT_LIST_HEAD(&rblk->prio);
+		spin_lock_init(&rblk->lock);
+	}
+
+	rlun->rrpc = rrpc;
+	rlun->parent = lun;
+	lun->private = rlun;
+	INIT_LIST_HEAD(&rlun->prio_list);
+	INIT_LIST_HEAD(&rlun->open_list);
+	INIT_LIST_HEAD(&rlun->closed_list);
+	INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
+	spin_lock_init(&rlun->lock);
+	spin_lock_init(&rlun->rev_lock);
+
+	return 0;
 }
 
-static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
+static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end,
+		unsigned long flags)
 {
 	struct nvm_dev *dev = rrpc->dev;
 	struct rrpc_lun *rlun;
-	int i, j;
+	int i, ret;
 
 	if (dev->pgs_per_blk > MAX_INVALID_PAGES_STORAGE * BITS_PER_LONG) {
 		pr_err("rrpc: number of pages per block too high.");
 		return -EINVAL;
 	}
 
-	spin_lock_init(&rrpc->rev_lock);
 
 	rrpc->luns = kcalloc(rrpc->nr_luns, sizeof(struct rrpc_lun),
 								GFP_KERNEL);
@@ -1163,40 +1236,29 @@ static int rrpc_luns_init(struct rrpc *rrpc, int lun_begin, int lun_end)
 
 	/* 1:1 mapping */
 	for (i = 0; i < rrpc->nr_luns; i++) {
-		struct nvm_lun *lun = dev->mt->get_lun(dev, lun_begin + i);
+		struct nvm_lun *lun = dev->mt->get_lun(dev,
+					lun_begin + i, flags);
 
-		rlun = &rrpc->luns[i];
-		rlun->rrpc = rrpc;
-		rlun->parent = lun;
-		INIT_LIST_HEAD(&rlun->prio_list);
-		INIT_LIST_HEAD(&rlun->open_list);
-		INIT_LIST_HEAD(&rlun->closed_list);
+		if (!lun) {
+			ret = -EINVAL;
+			goto err;
+		}
 
-		INIT_WORK(&rlun->ws_gc, rrpc_lun_gc);
-		spin_lock_init(&rlun->lock);
+		rlun = &rrpc->luns[i];
+		ret = rrpc_lun_init(rrpc, rlun, lun);
+		if (!ret)
+			goto err;
 
 		rrpc->total_blocks += dev->blks_per_lun;
 		rrpc->nr_pages += dev->sec_per_lun;
 
-		rlun->blocks = vzalloc(sizeof(struct rrpc_block) *
-						rrpc->dev->blks_per_lun);
-		if (!rlun->blocks)
-			goto err;
-
-		for (j = 0; j < rrpc->dev->blks_per_lun; j++) {
-			struct rrpc_block *rblk = &rlun->blocks[j];
-			struct nvm_block *blk = &lun->blocks[j];
-
-			rblk->parent = blk;
-			rblk->rlun = rlun;
-			INIT_LIST_HEAD(&rblk->prio);
-			spin_lock_init(&rblk->lock);
-		}
 	}
 
 	return 0;
 err:
-	return -ENOMEM;
+	rrpc_luns_free(rrpc);
+	return ret;
+
 }
 
 static int rrpc_area_init(struct rrpc *rrpc, sector_t *begin)
@@ -1269,14 +1331,16 @@ static sector_t rrpc_capacity(void *private)
 static void rrpc_block_map_update(struct rrpc *rrpc, struct rrpc_block *rblk)
 {
 	struct nvm_dev *dev = rrpc->dev;
+	struct rrpc_lun *rlun = rblk->rlun;
 	int offset;
 	struct rrpc_addr *laddr;
-	u64 paddr, pladdr;
+	u64 paddr, pladdr, poffset;
 
+	poffset = lun_poffset(rlun->parent, dev);
 	for (offset = 0; offset < dev->pgs_per_blk; offset++) {
 		paddr = block_to_addr(rrpc, rblk) + offset;
 
-		pladdr = rrpc->rev_trans_map[paddr].addr;
+		pladdr = rlun->rev_trans_map[paddr - poffset].addr;
 		if (pladdr == ADDR_EMPTY)
 			continue;
 
@@ -1341,7 +1405,7 @@ err:
 static struct nvm_tgt_type tt_rrpc;
 
 static void *rrpc_init(struct nvm_dev *dev, struct gendisk *tdisk,
-						int lun_begin, int lun_end)
+		int lun_begin, int lun_end, unsigned long flags)
 {
 	struct request_queue *bqueue = dev->q;
 	struct request_queue *tqueue = tdisk->queue;
@@ -1379,15 +1443,12 @@ static void *rrpc_init(struct nvm_dev *dev, struct gendisk *tdisk,
 	}
 	rrpc->soffset = soffset;
 
-	ret = rrpc_luns_init(rrpc, lun_begin, lun_end);
+	ret = rrpc_luns_init(rrpc, lun_begin, lun_end, flags);
 	if (ret) {
 		pr_err("nvm: rrpc: could not initialize luns\n");
 		goto err;
 	}
 
-	rrpc->poffset = dev->sec_per_lun * lun_begin;
-	rrpc->lun_offset = lun_begin;
-
 	ret = rrpc_core_init(rrpc);
 	if (ret) {
 		pr_err("nvm: rrpc: could not initialize core\n");
diff --git a/drivers/lightnvm/rrpc.h b/drivers/lightnvm/rrpc.h
index 9380c68..4d756d8 100644
--- a/drivers/lightnvm/rrpc.h
+++ b/drivers/lightnvm/rrpc.h
@@ -86,6 +86,9 @@ struct rrpc_lun {
 					 */
 
 	struct work_struct ws_gc;
+	/* store a reverse map for garbage collection */
+	struct rrpc_rev_addr *rev_trans_map;
+	spinlock_t rev_lock;
 
 	spinlock_t lock;
 };
@@ -124,9 +127,6 @@ struct rrpc {
 	 * addresses are used when writing to the disk block device.
 	 */
 	struct rrpc_addr *trans_map;
-	/* also store a reverse map for garbage collection */
-	struct rrpc_rev_addr *rev_trans_map;
-	spinlock_t rev_lock;
 
 	struct rrpc_inflight inflights;
 
diff --git a/include/linux/lightnvm.h b/include/linux/lightnvm.h
index 18f1bb0..88a9d2b 100644
--- a/include/linux/lightnvm.h
+++ b/include/linux/lightnvm.h
@@ -212,6 +212,20 @@ struct nvm_tgt_instance {
 #define NVM_VERSION_MINOR 0
 #define NVM_VERSION_PATCH 0
 
+#define NVM_FIXED	0X0001
+#define NVM_NOALLOC	0X0002
+
+/* These are stolen from mman.h */
+#define _calc_nvm_trans(x, bit1, bit2) \
+	((bit1) <= (bit2) ? ((x) & (bit1)) * ((bit2) / (bit1)) \
+		: ((x) & (bit1)) / ((bit1) / (bit2)))
+
+static inline unsigned long
+calc_nvm_create_bits(__u32 c_flags)
+{
+	return _calc_nvm_trans(c_flags, NVM_C_FIXED, NVM_FIXED);
+}
+
 struct nvm_rq;
 typedef void (nvm_end_io_fn)(struct nvm_rq *);
 
@@ -271,6 +285,7 @@ struct nvm_lun {
 	spinlock_t lock;
 
 	struct nvm_block *blocks;
+	void *private;
 };
 
 enum {
@@ -342,6 +357,8 @@ struct nvm_dev {
 	int nr_luns;
 	unsigned max_pages_per_blk;
 
+	unsigned long *lun_map;
+
 	void *ppalist_pool;
 
 	struct nvm_id identity;
@@ -424,7 +441,8 @@ static inline int ppa_to_slc(struct nvm_dev *dev, int slc_pg)
 
 typedef blk_qc_t (nvm_tgt_make_rq_fn)(struct request_queue *, struct bio *);
 typedef sector_t (nvm_tgt_capacity_fn)(void *);
-typedef void *(nvm_tgt_init_fn)(struct nvm_dev *, struct gendisk *, int, int);
+typedef void *(nvm_tgt_init_fn)(struct nvm_dev *, struct gendisk *, int, int,
+				unsigned long);
 typedef void (nvm_tgt_exit_fn)(void *);
 
 struct nvm_tgt_type {
@@ -461,7 +479,8 @@ typedef void (nvmm_flush_blk_fn)(struct nvm_dev *, struct nvm_block *);
 typedef int (nvmm_submit_io_fn)(struct nvm_dev *, struct nvm_rq *);
 typedef int (nvmm_erase_blk_fn)(struct nvm_dev *, struct nvm_block *,
 								unsigned long);
-typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int);
+typedef struct nvm_lun *(nvmm_get_lun_fn)(struct nvm_dev *, int, unsigned long);
+typedef void (nvmm_put_lun_fn)(struct nvm_dev *, int);
 typedef void (nvmm_lun_info_print_fn)(struct nvm_dev *);
 
 typedef int (nvmm_get_area_fn)(struct nvm_dev *, sector_t *, sector_t);
@@ -488,6 +507,7 @@ struct nvmm_type {
 
 	/* Configuration management */
 	nvmm_get_lun_fn *get_lun;
+	nvmm_put_lun_fn *put_lun;
 
 	/* Statistics */
 	nvmm_lun_info_print_fn *lun_info_print;
diff --git a/include/uapi/linux/lightnvm.h b/include/uapi/linux/lightnvm.h
index 774a431..700f8b2 100644
--- a/include/uapi/linux/lightnvm.h
+++ b/include/uapi/linux/lightnvm.h
@@ -37,6 +37,9 @@
 
 #define NVM_CTRL_FILE "/dev/lightnvm/control"
 
+#define NVM_C_FIXED	0X0001  /* Interpret lun exactly */
+#define NVM_C_FLAGS	NVM_C_FIXED
+
 struct nvm_ioctl_info_tgt {
 	__u32 version[3];
 	__u32 reserved;
-- 
1.8.3.1

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