Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2148 insertions, 0 deletions

diff --git a/drivers/lightnvm/pblk-core.c b/drivers/lightnvm/pblk-core.c
new file mode 100644
index 000000000..97c687314
--- /dev/null
+++ b/drivers/lightnvm/pblk-core.c
@@ -0,0 +1,2148 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2016 CNEX Labs
+ * Initial release: Javier Gonzalez <javier@cnexlabs.com>
+ *                  Matias Bjorling <matias@cnexlabs.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * pblk-core.c - pblk's core functionality
+ *
+ */
+
+#define CREATE_TRACE_POINTS
+
+#include "pblk.h"
+#include "pblk-trace.h"
+
+static void pblk_line_mark_bb(struct work_struct *work)
+{
+	struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
+									ws);
+	struct pblk *pblk = line_ws->pblk;
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct ppa_addr *ppa = line_ws->priv;
+	int ret;
+
+	ret = nvm_set_chunk_meta(dev, ppa, 1, NVM_BLK_T_GRWN_BAD);
+	if (ret) {
+		struct pblk_line *line;
+		int pos;
+
+		line = pblk_ppa_to_line(pblk, *ppa);
+		pos = pblk_ppa_to_pos(&dev->geo, *ppa);
+
+		pblk_err(pblk, "failed to mark bb, line:%d, pos:%d\n",
+				line->id, pos);
+	}
+
+	kfree(ppa);
+	mempool_free(line_ws, &pblk->gen_ws_pool);
+}
+
+static void pblk_mark_bb(struct pblk *pblk, struct pblk_line *line,
+			 struct ppa_addr ppa_addr)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	struct ppa_addr *ppa;
+	int pos = pblk_ppa_to_pos(geo, ppa_addr);
+
+	pblk_debug(pblk, "erase failed: line:%d, pos:%d\n", line->id, pos);
+	atomic_long_inc(&pblk->erase_failed);
+
+	atomic_dec(&line->blk_in_line);
+	if (test_and_set_bit(pos, line->blk_bitmap))
+		pblk_err(pblk, "attempted to erase bb: line:%d, pos:%d\n",
+							line->id, pos);
+
+	/* Not necessary to mark bad blocks on 2.0 spec. */
+	if (geo->version == NVM_OCSSD_SPEC_20)
+		return;
+
+	ppa = kmalloc(sizeof(struct ppa_addr), GFP_ATOMIC);
+	if (!ppa)
+		return;
+
+	*ppa = ppa_addr;
+	pblk_gen_run_ws(pblk, NULL, ppa, pblk_line_mark_bb,
+						GFP_ATOMIC, pblk->bb_wq);
+}
+
+static void __pblk_end_io_erase(struct pblk *pblk, struct nvm_rq *rqd)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	struct nvm_chk_meta *chunk;
+	struct pblk_line *line;
+	int pos;
+
+	line = pblk_ppa_to_line(pblk, rqd->ppa_addr);
+	pos = pblk_ppa_to_pos(geo, rqd->ppa_addr);
+	chunk = &line->chks[pos];
+
+	atomic_dec(&line->left_seblks);
+
+	if (rqd->error) {
+		trace_pblk_chunk_reset(pblk_disk_name(pblk),
+				&rqd->ppa_addr, PBLK_CHUNK_RESET_FAILED);
+
+		chunk->state = NVM_CHK_ST_OFFLINE;
+		pblk_mark_bb(pblk, line, rqd->ppa_addr);
+	} else {
+		trace_pblk_chunk_reset(pblk_disk_name(pblk),
+				&rqd->ppa_addr, PBLK_CHUNK_RESET_DONE);
+
+		chunk->state = NVM_CHK_ST_FREE;
+	}
+
+	trace_pblk_chunk_state(pblk_disk_name(pblk), &rqd->ppa_addr,
+				chunk->state);
+
+	atomic_dec(&pblk->inflight_io);
+}
+
+/* Erase completion assumes that only one block is erased at the time */
+static void pblk_end_io_erase(struct nvm_rq *rqd)
+{
+	struct pblk *pblk = rqd->private;
+
+	__pblk_end_io_erase(pblk, rqd);
+	mempool_free(rqd, &pblk->e_rq_pool);
+}
+
+/*
+ * Get information for all chunks from the device.
+ *
+ * The caller is responsible for freeing (vmalloc) the returned structure
+ */
+struct nvm_chk_meta *pblk_get_chunk_meta(struct pblk *pblk)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	struct nvm_chk_meta *meta;
+	struct ppa_addr ppa;
+	unsigned long len;
+	int ret;
+
+	ppa.ppa = 0;
+
+	len = geo->all_chunks * sizeof(*meta);
+	meta = vzalloc(len);
+	if (!meta)
+		return ERR_PTR(-ENOMEM);
+
+	ret = nvm_get_chunk_meta(dev, ppa, geo->all_chunks, meta);
+	if (ret) {
+		vfree(meta);
+		return ERR_PTR(-EIO);
+	}
+
+	return meta;
+}
+
+struct nvm_chk_meta *pblk_chunk_get_off(struct pblk *pblk,
+					      struct nvm_chk_meta *meta,
+					      struct ppa_addr ppa)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	int ch_off = ppa.m.grp * geo->num_chk * geo->num_lun;
+	int lun_off = ppa.m.pu * geo->num_chk;
+	int chk_off = ppa.m.chk;
+
+	return meta + ch_off + lun_off + chk_off;
+}
+
+void __pblk_map_invalidate(struct pblk *pblk, struct pblk_line *line,
+			   u64 paddr)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct list_head *move_list = NULL;
+
+	/* Lines being reclaimed (GC'ed) cannot be invalidated. Before the L2P
+	 * table is modified with reclaimed sectors, a check is done to endure
+	 * that newer updates are not overwritten.
+	 */
+	spin_lock(&line->lock);
+	WARN_ON(line->state == PBLK_LINESTATE_FREE);
+
+	if (test_and_set_bit(paddr, line->invalid_bitmap)) {
+		WARN_ONCE(1, "pblk: double invalidate\n");
+		spin_unlock(&line->lock);
+		return;
+	}
+	le32_add_cpu(line->vsc, -1);
+
+	if (line->state == PBLK_LINESTATE_CLOSED)
+		move_list = pblk_line_gc_list(pblk, line);
+	spin_unlock(&line->lock);
+
+	if (move_list) {
+		spin_lock(&l_mg->gc_lock);
+		spin_lock(&line->lock);
+		/* Prevent moving a line that has just been chosen for GC */
+		if (line->state == PBLK_LINESTATE_GC) {
+			spin_unlock(&line->lock);
+			spin_unlock(&l_mg->gc_lock);
+			return;
+		}
+		spin_unlock(&line->lock);
+
+		list_move_tail(&line->list, move_list);
+		spin_unlock(&l_mg->gc_lock);
+	}
+}
+
+void pblk_map_invalidate(struct pblk *pblk, struct ppa_addr ppa)
+{
+	struct pblk_line *line;
+	u64 paddr;
+
+#ifdef CONFIG_NVM_PBLK_DEBUG
+	/* Callers must ensure that the ppa points to a device address */
+	BUG_ON(pblk_addr_in_cache(ppa));
+	BUG_ON(pblk_ppa_empty(ppa));
+#endif
+
+	line = pblk_ppa_to_line(pblk, ppa);
+	paddr = pblk_dev_ppa_to_line_addr(pblk, ppa);
+
+	__pblk_map_invalidate(pblk, line, paddr);
+}
+
+static void pblk_invalidate_range(struct pblk *pblk, sector_t slba,
+				  unsigned int nr_secs)
+{
+	sector_t lba;
+
+	spin_lock(&pblk->trans_lock);
+	for (lba = slba; lba < slba + nr_secs; lba++) {
+		struct ppa_addr ppa;
+
+		ppa = pblk_trans_map_get(pblk, lba);
+
+		if (!pblk_addr_in_cache(ppa) && !pblk_ppa_empty(ppa))
+			pblk_map_invalidate(pblk, ppa);
+
+		pblk_ppa_set_empty(&ppa);
+		pblk_trans_map_set(pblk, lba, ppa);
+	}
+	spin_unlock(&pblk->trans_lock);
+}
+
+int pblk_alloc_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+
+	rqd->meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
+							&rqd->dma_meta_list);
+	if (!rqd->meta_list)
+		return -ENOMEM;
+
+	if (rqd->nr_ppas == 1)
+		return 0;
+
+	rqd->ppa_list = rqd->meta_list + pblk_dma_meta_size(pblk);
+	rqd->dma_ppa_list = rqd->dma_meta_list + pblk_dma_meta_size(pblk);
+
+	return 0;
+}
+
+void pblk_free_rqd_meta(struct pblk *pblk, struct nvm_rq *rqd)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+
+	if (rqd->meta_list)
+		nvm_dev_dma_free(dev->parent, rqd->meta_list,
+				rqd->dma_meta_list);
+}
+
+/* Caller must guarantee that the request is a valid type */
+struct nvm_rq *pblk_alloc_rqd(struct pblk *pblk, int type)
+{
+	mempool_t *pool;
+	struct nvm_rq *rqd;
+	int rq_size;
+
+	switch (type) {
+	case PBLK_WRITE:
+	case PBLK_WRITE_INT:
+		pool = &pblk->w_rq_pool;
+		rq_size = pblk_w_rq_size;
+		break;
+	case PBLK_READ:
+		pool = &pblk->r_rq_pool;
+		rq_size = pblk_g_rq_size;
+		break;
+	default:
+		pool = &pblk->e_rq_pool;
+		rq_size = pblk_g_rq_size;
+	}
+
+	rqd = mempool_alloc(pool, GFP_KERNEL);
+	memset(rqd, 0, rq_size);
+
+	return rqd;
+}
+
+/* Typically used on completion path. Cannot guarantee request consistency */
+void pblk_free_rqd(struct pblk *pblk, struct nvm_rq *rqd, int type)
+{
+	mempool_t *pool;
+
+	switch (type) {
+	case PBLK_WRITE:
+		kfree(((struct pblk_c_ctx *)nvm_rq_to_pdu(rqd))->lun_bitmap);
+		fallthrough;
+	case PBLK_WRITE_INT:
+		pool = &pblk->w_rq_pool;
+		break;
+	case PBLK_READ:
+		pool = &pblk->r_rq_pool;
+		break;
+	case PBLK_ERASE:
+		pool = &pblk->e_rq_pool;
+		break;
+	default:
+		pblk_err(pblk, "trying to free unknown rqd type\n");
+		return;
+	}
+
+	pblk_free_rqd_meta(pblk, rqd);
+	mempool_free(rqd, pool);
+}
+
+void pblk_bio_free_pages(struct pblk *pblk, struct bio *bio, int off,
+			 int nr_pages)
+{
+	struct bio_vec *bv;
+	struct page *page;
+	int i, e, nbv = 0;
+
+	for (i = 0; i < bio->bi_vcnt; i++) {
+		bv = &bio->bi_io_vec[i];
+		page = bv->bv_page;
+		for (e = 0; e < bv->bv_len; e += PBLK_EXPOSED_PAGE_SIZE, nbv++)
+			if (nbv >= off)
+				mempool_free(page++, &pblk->page_bio_pool);
+	}
+}
+
+int pblk_bio_add_pages(struct pblk *pblk, struct bio *bio, gfp_t flags,
+		       int nr_pages)
+{
+	struct request_queue *q = pblk->dev->q;
+	struct page *page;
+	int i, ret;
+
+	for (i = 0; i < nr_pages; i++) {
+		page = mempool_alloc(&pblk->page_bio_pool, flags);
+
+		ret = bio_add_pc_page(q, bio, page, PBLK_EXPOSED_PAGE_SIZE, 0);
+		if (ret != PBLK_EXPOSED_PAGE_SIZE) {
+			pblk_err(pblk, "could not add page to bio\n");
+			mempool_free(page, &pblk->page_bio_pool);
+			goto err;
+		}
+	}
+
+	return 0;
+err:
+	pblk_bio_free_pages(pblk, bio, (bio->bi_vcnt - i), i);
+	return -1;
+}
+
+void pblk_write_kick(struct pblk *pblk)
+{
+	wake_up_process(pblk->writer_ts);
+	mod_timer(&pblk->wtimer, jiffies + msecs_to_jiffies(1000));
+}
+
+void pblk_write_timer_fn(struct timer_list *t)
+{
+	struct pblk *pblk = from_timer(pblk, t, wtimer);
+
+	/* kick the write thread every tick to flush outstanding data */
+	pblk_write_kick(pblk);
+}
+
+void pblk_write_should_kick(struct pblk *pblk)
+{
+	unsigned int secs_avail = pblk_rb_read_count(&pblk->rwb);
+
+	if (secs_avail >= pblk->min_write_pgs_data)
+		pblk_write_kick(pblk);
+}
+
+static void pblk_wait_for_meta(struct pblk *pblk)
+{
+	do {
+		if (!atomic_read(&pblk->inflight_io))
+			break;
+
+		schedule();
+	} while (1);
+}
+
+static void pblk_flush_writer(struct pblk *pblk)
+{
+	pblk_rb_flush(&pblk->rwb);
+	do {
+		if (!pblk_rb_sync_count(&pblk->rwb))
+			break;
+
+		pblk_write_kick(pblk);
+		schedule();
+	} while (1);
+}
+
+struct list_head *pblk_line_gc_list(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct list_head *move_list = NULL;
+	int packed_meta = (le32_to_cpu(*line->vsc) / pblk->min_write_pgs_data)
+			* (pblk->min_write_pgs - pblk->min_write_pgs_data);
+	int vsc = le32_to_cpu(*line->vsc) + packed_meta;
+
+	lockdep_assert_held(&line->lock);
+
+	if (line->w_err_gc->has_write_err) {
+		if (line->gc_group != PBLK_LINEGC_WERR) {
+			line->gc_group = PBLK_LINEGC_WERR;
+			move_list = &l_mg->gc_werr_list;
+			pblk_rl_werr_line_in(&pblk->rl);
+		}
+	} else if (!vsc) {
+		if (line->gc_group != PBLK_LINEGC_FULL) {
+			line->gc_group = PBLK_LINEGC_FULL;
+			move_list = &l_mg->gc_full_list;
+		}
+	} else if (vsc < lm->high_thrs) {
+		if (line->gc_group != PBLK_LINEGC_HIGH) {
+			line->gc_group = PBLK_LINEGC_HIGH;
+			move_list = &l_mg->gc_high_list;
+		}
+	} else if (vsc < lm->mid_thrs) {
+		if (line->gc_group != PBLK_LINEGC_MID) {
+			line->gc_group = PBLK_LINEGC_MID;
+			move_list = &l_mg->gc_mid_list;
+		}
+	} else if (vsc < line->sec_in_line) {
+		if (line->gc_group != PBLK_LINEGC_LOW) {
+			line->gc_group = PBLK_LINEGC_LOW;
+			move_list = &l_mg->gc_low_list;
+		}
+	} else if (vsc == line->sec_in_line) {
+		if (line->gc_group != PBLK_LINEGC_EMPTY) {
+			line->gc_group = PBLK_LINEGC_EMPTY;
+			move_list = &l_mg->gc_empty_list;
+		}
+	} else {
+		line->state = PBLK_LINESTATE_CORRUPT;
+		trace_pblk_line_state(pblk_disk_name(pblk), line->id,
+					line->state);
+
+		line->gc_group = PBLK_LINEGC_NONE;
+		move_list =  &l_mg->corrupt_list;
+		pblk_err(pblk, "corrupted vsc for line %d, vsc:%d (%d/%d/%d)\n",
+						line->id, vsc,
+						line->sec_in_line,
+						lm->high_thrs, lm->mid_thrs);
+	}
+
+	return move_list;
+}
+
+void pblk_discard(struct pblk *pblk, struct bio *bio)
+{
+	sector_t slba = pblk_get_lba(bio);
+	sector_t nr_secs = pblk_get_secs(bio);
+
+	pblk_invalidate_range(pblk, slba, nr_secs);
+}
+
+void pblk_log_write_err(struct pblk *pblk, struct nvm_rq *rqd)
+{
+	atomic_long_inc(&pblk->write_failed);
+#ifdef CONFIG_NVM_PBLK_DEBUG
+	pblk_print_failed_rqd(pblk, rqd, rqd->error);
+#endif
+}
+
+void pblk_log_read_err(struct pblk *pblk, struct nvm_rq *rqd)
+{
+	/* Empty page read is not necessarily an error (e.g., L2P recovery) */
+	if (rqd->error == NVM_RSP_ERR_EMPTYPAGE) {
+		atomic_long_inc(&pblk->read_empty);
+		return;
+	}
+
+	switch (rqd->error) {
+	case NVM_RSP_WARN_HIGHECC:
+		atomic_long_inc(&pblk->read_high_ecc);
+		break;
+	case NVM_RSP_ERR_FAILECC:
+	case NVM_RSP_ERR_FAILCRC:
+		atomic_long_inc(&pblk->read_failed);
+		break;
+	default:
+		pblk_err(pblk, "unknown read error:%d\n", rqd->error);
+	}
+#ifdef CONFIG_NVM_PBLK_DEBUG
+	pblk_print_failed_rqd(pblk, rqd, rqd->error);
+#endif
+}
+
+void pblk_set_sec_per_write(struct pblk *pblk, int sec_per_write)
+{
+	pblk->sec_per_write = sec_per_write;
+}
+
+int pblk_submit_io(struct pblk *pblk, struct nvm_rq *rqd, void *buf)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+
+	atomic_inc(&pblk->inflight_io);
+
+#ifdef CONFIG_NVM_PBLK_DEBUG
+	if (pblk_check_io(pblk, rqd))
+		return NVM_IO_ERR;
+#endif
+
+	return nvm_submit_io(dev, rqd, buf);
+}
+
+void pblk_check_chunk_state_update(struct pblk *pblk, struct nvm_rq *rqd)
+{
+	struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
+
+	int i;
+
+	for (i = 0; i < rqd->nr_ppas; i++) {
+		struct ppa_addr *ppa = &ppa_list[i];
+		struct nvm_chk_meta *chunk = pblk_dev_ppa_to_chunk(pblk, *ppa);
+		u64 caddr = pblk_dev_ppa_to_chunk_addr(pblk, *ppa);
+
+		if (caddr == 0)
+			trace_pblk_chunk_state(pblk_disk_name(pblk),
+							ppa, NVM_CHK_ST_OPEN);
+		else if (caddr == (chunk->cnlb - 1))
+			trace_pblk_chunk_state(pblk_disk_name(pblk),
+							ppa, NVM_CHK_ST_CLOSED);
+	}
+}
+
+int pblk_submit_io_sync(struct pblk *pblk, struct nvm_rq *rqd, void *buf)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	int ret;
+
+	atomic_inc(&pblk->inflight_io);
+
+#ifdef CONFIG_NVM_PBLK_DEBUG
+	if (pblk_check_io(pblk, rqd))
+		return NVM_IO_ERR;
+#endif
+
+	ret = nvm_submit_io_sync(dev, rqd, buf);
+
+	if (trace_pblk_chunk_state_enabled() && !ret &&
+	    rqd->opcode == NVM_OP_PWRITE)
+		pblk_check_chunk_state_update(pblk, rqd);
+
+	return ret;
+}
+
+static int pblk_submit_io_sync_sem(struct pblk *pblk, struct nvm_rq *rqd,
+				   void *buf)
+{
+	struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
+	int ret;
+
+	pblk_down_chunk(pblk, ppa_list[0]);
+	ret = pblk_submit_io_sync(pblk, rqd, buf);
+	pblk_up_chunk(pblk, ppa_list[0]);
+
+	return ret;
+}
+
+int pblk_calc_secs(struct pblk *pblk, unsigned long secs_avail,
+		   unsigned long secs_to_flush, bool skip_meta)
+{
+	int max = pblk->sec_per_write;
+	int min = pblk->min_write_pgs;
+	int secs_to_sync = 0;
+
+	if (skip_meta && pblk->min_write_pgs_data != pblk->min_write_pgs)
+		min = max = pblk->min_write_pgs_data;
+
+	if (secs_avail >= max)
+		secs_to_sync = max;
+	else if (secs_avail >= min)
+		secs_to_sync = min * (secs_avail / min);
+	else if (secs_to_flush)
+		secs_to_sync = min;
+
+	return secs_to_sync;
+}
+
+void pblk_dealloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
+{
+	u64 addr;
+	int i;
+
+	spin_lock(&line->lock);
+	addr = find_next_zero_bit(line->map_bitmap,
+					pblk->lm.sec_per_line, line->cur_sec);
+	line->cur_sec = addr - nr_secs;
+
+	for (i = 0; i < nr_secs; i++, line->cur_sec--)
+		WARN_ON(!test_and_clear_bit(line->cur_sec, line->map_bitmap));
+	spin_unlock(&line->lock);
+}
+
+u64 __pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
+{
+	u64 addr;
+	int i;
+
+	lockdep_assert_held(&line->lock);
+
+	/* logic error: ppa out-of-bounds. Prevent generating bad address */
+	if (line->cur_sec + nr_secs > pblk->lm.sec_per_line) {
+		WARN(1, "pblk: page allocation out of bounds\n");
+		nr_secs = pblk->lm.sec_per_line - line->cur_sec;
+	}
+
+	line->cur_sec = addr = find_next_zero_bit(line->map_bitmap,
+					pblk->lm.sec_per_line, line->cur_sec);
+	for (i = 0; i < nr_secs; i++, line->cur_sec++)
+		WARN_ON(test_and_set_bit(line->cur_sec, line->map_bitmap));
+
+	return addr;
+}
+
+u64 pblk_alloc_page(struct pblk *pblk, struct pblk_line *line, int nr_secs)
+{
+	u64 addr;
+
+	/* Lock needed in case a write fails and a recovery needs to remap
+	 * failed write buffer entries
+	 */
+	spin_lock(&line->lock);
+	addr = __pblk_alloc_page(pblk, line, nr_secs);
+	line->left_msecs -= nr_secs;
+	WARN(line->left_msecs < 0, "pblk: page allocation out of bounds\n");
+	spin_unlock(&line->lock);
+
+	return addr;
+}
+
+u64 pblk_lookup_page(struct pblk *pblk, struct pblk_line *line)
+{
+	u64 paddr;
+
+	spin_lock(&line->lock);
+	paddr = find_next_zero_bit(line->map_bitmap,
+					pblk->lm.sec_per_line, line->cur_sec);
+	spin_unlock(&line->lock);
+
+	return paddr;
+}
+
+u64 pblk_line_smeta_start(struct pblk *pblk, struct pblk_line *line)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	struct pblk_line_meta *lm = &pblk->lm;
+	int bit;
+
+	/* This usually only happens on bad lines */
+	bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
+	if (bit >= lm->blk_per_line)
+		return -1;
+
+	return bit * geo->ws_opt;
+}
+
+int pblk_line_smeta_read(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct ppa_addr *ppa_list;
+	struct nvm_rq rqd;
+	u64 paddr = pblk_line_smeta_start(pblk, line);
+	int i, ret;
+
+	memset(&rqd, 0, sizeof(struct nvm_rq));
+
+	ret = pblk_alloc_rqd_meta(pblk, &rqd);
+	if (ret)
+		return ret;
+
+	rqd.opcode = NVM_OP_PREAD;
+	rqd.nr_ppas = lm->smeta_sec;
+	rqd.is_seq = 1;
+	ppa_list = nvm_rq_to_ppa_list(&rqd);
+
+	for (i = 0; i < lm->smeta_sec; i++, paddr++)
+		ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id);
+
+	ret = pblk_submit_io_sync(pblk, &rqd, line->smeta);
+	if (ret) {
+		pblk_err(pblk, "smeta I/O submission failed: %d\n", ret);
+		goto clear_rqd;
+	}
+
+	atomic_dec(&pblk->inflight_io);
+
+	if (rqd.error && rqd.error != NVM_RSP_WARN_HIGHECC) {
+		pblk_log_read_err(pblk, &rqd);
+		ret = -EIO;
+	}
+
+clear_rqd:
+	pblk_free_rqd_meta(pblk, &rqd);
+	return ret;
+}
+
+static int pblk_line_smeta_write(struct pblk *pblk, struct pblk_line *line,
+				 u64 paddr)
+{
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct ppa_addr *ppa_list;
+	struct nvm_rq rqd;
+	__le64 *lba_list = emeta_to_lbas(pblk, line->emeta->buf);
+	__le64 addr_empty = cpu_to_le64(ADDR_EMPTY);
+	int i, ret;
+
+	memset(&rqd, 0, sizeof(struct nvm_rq));
+
+	ret = pblk_alloc_rqd_meta(pblk, &rqd);
+	if (ret)
+		return ret;
+
+	rqd.opcode = NVM_OP_PWRITE;
+	rqd.nr_ppas = lm->smeta_sec;
+	rqd.is_seq = 1;
+	ppa_list = nvm_rq_to_ppa_list(&rqd);
+
+	for (i = 0; i < lm->smeta_sec; i++, paddr++) {
+		struct pblk_sec_meta *meta = pblk_get_meta(pblk,
+							   rqd.meta_list, i);
+
+		ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line->id);
+		meta->lba = lba_list[paddr] = addr_empty;
+	}
+
+	ret = pblk_submit_io_sync_sem(pblk, &rqd, line->smeta);
+	if (ret) {
+		pblk_err(pblk, "smeta I/O submission failed: %d\n", ret);
+		goto clear_rqd;
+	}
+
+	atomic_dec(&pblk->inflight_io);
+
+	if (rqd.error) {
+		pblk_log_write_err(pblk, &rqd);
+		ret = -EIO;
+	}
+
+clear_rqd:
+	pblk_free_rqd_meta(pblk, &rqd);
+	return ret;
+}
+
+int pblk_line_emeta_read(struct pblk *pblk, struct pblk_line *line,
+			 void *emeta_buf)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	struct pblk_line_meta *lm = &pblk->lm;
+	void *ppa_list_buf, *meta_list;
+	struct ppa_addr *ppa_list;
+	struct nvm_rq rqd;
+	u64 paddr = line->emeta_ssec;
+	dma_addr_t dma_ppa_list, dma_meta_list;
+	int min = pblk->min_write_pgs;
+	int left_ppas = lm->emeta_sec[0];
+	int line_id = line->id;
+	int rq_ppas, rq_len;
+	int i, j;
+	int ret;
+
+	meta_list = nvm_dev_dma_alloc(dev->parent, GFP_KERNEL,
+							&dma_meta_list);
+	if (!meta_list)
+		return -ENOMEM;
+
+	ppa_list_buf = meta_list + pblk_dma_meta_size(pblk);
+	dma_ppa_list = dma_meta_list + pblk_dma_meta_size(pblk);
+
+next_rq:
+	memset(&rqd, 0, sizeof(struct nvm_rq));
+
+	rq_ppas = pblk_calc_secs(pblk, left_ppas, 0, false);
+	rq_len = rq_ppas * geo->csecs;
+
+	rqd.meta_list = meta_list;
+	rqd.ppa_list = ppa_list_buf;
+	rqd.dma_meta_list = dma_meta_list;
+	rqd.dma_ppa_list = dma_ppa_list;
+	rqd.opcode = NVM_OP_PREAD;
+	rqd.nr_ppas = rq_ppas;
+	ppa_list = nvm_rq_to_ppa_list(&rqd);
+
+	for (i = 0; i < rqd.nr_ppas; ) {
+		struct ppa_addr ppa = addr_to_gen_ppa(pblk, paddr, line_id);
+		int pos = pblk_ppa_to_pos(geo, ppa);
+
+		if (pblk_io_aligned(pblk, rq_ppas))
+			rqd.is_seq = 1;
+
+		while (test_bit(pos, line->blk_bitmap)) {
+			paddr += min;
+			if (pblk_boundary_paddr_checks(pblk, paddr)) {
+				ret = -EINTR;
+				goto free_rqd_dma;
+			}
+
+			ppa = addr_to_gen_ppa(pblk, paddr, line_id);
+			pos = pblk_ppa_to_pos(geo, ppa);
+		}
+
+		if (pblk_boundary_paddr_checks(pblk, paddr + min)) {
+			ret = -EINTR;
+			goto free_rqd_dma;
+		}
+
+		for (j = 0; j < min; j++, i++, paddr++)
+			ppa_list[i] = addr_to_gen_ppa(pblk, paddr, line_id);
+	}
+
+	ret = pblk_submit_io_sync(pblk, &rqd, emeta_buf);
+	if (ret) {
+		pblk_err(pblk, "emeta I/O submission failed: %d\n", ret);
+		goto free_rqd_dma;
+	}
+
+	atomic_dec(&pblk->inflight_io);
+
+	if (rqd.error && rqd.error != NVM_RSP_WARN_HIGHECC) {
+		pblk_log_read_err(pblk, &rqd);
+		ret = -EIO;
+		goto free_rqd_dma;
+	}
+
+	emeta_buf += rq_len;
+	left_ppas -= rq_ppas;
+	if (left_ppas)
+		goto next_rq;
+
+free_rqd_dma:
+	nvm_dev_dma_free(dev->parent, rqd.meta_list, rqd.dma_meta_list);
+	return ret;
+}
+
+static void pblk_setup_e_rq(struct pblk *pblk, struct nvm_rq *rqd,
+			    struct ppa_addr ppa)
+{
+	rqd->opcode = NVM_OP_ERASE;
+	rqd->ppa_addr = ppa;
+	rqd->nr_ppas = 1;
+	rqd->is_seq = 1;
+	rqd->bio = NULL;
+}
+
+static int pblk_blk_erase_sync(struct pblk *pblk, struct ppa_addr ppa)
+{
+	struct nvm_rq rqd = {NULL};
+	int ret;
+
+	trace_pblk_chunk_reset(pblk_disk_name(pblk), &ppa,
+				PBLK_CHUNK_RESET_START);
+
+	pblk_setup_e_rq(pblk, &rqd, ppa);
+
+	/* The write thread schedules erases so that it minimizes disturbances
+	 * with writes. Thus, there is no need to take the LUN semaphore.
+	 */
+	ret = pblk_submit_io_sync(pblk, &rqd, NULL);
+	rqd.private = pblk;
+	__pblk_end_io_erase(pblk, &rqd);
+
+	return ret;
+}
+
+int pblk_line_erase(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct ppa_addr ppa;
+	int ret, bit = -1;
+
+	/* Erase only good blocks, one at a time */
+	do {
+		spin_lock(&line->lock);
+		bit = find_next_zero_bit(line->erase_bitmap, lm->blk_per_line,
+								bit + 1);
+		if (bit >= lm->blk_per_line) {
+			spin_unlock(&line->lock);
+			break;
+		}
+
+		ppa = pblk->luns[bit].bppa; /* set ch and lun */
+		ppa.a.blk = line->id;
+
+		atomic_dec(&line->left_eblks);
+		WARN_ON(test_and_set_bit(bit, line->erase_bitmap));
+		spin_unlock(&line->lock);
+
+		ret = pblk_blk_erase_sync(pblk, ppa);
+		if (ret) {
+			pblk_err(pblk, "failed to erase line %d\n", line->id);
+			return ret;
+		}
+	} while (1);
+
+	return 0;
+}
+
+static void pblk_line_setup_metadata(struct pblk_line *line,
+				     struct pblk_line_mgmt *l_mg,
+				     struct pblk_line_meta *lm)
+{
+	int meta_line;
+
+	lockdep_assert_held(&l_mg->free_lock);
+
+retry_meta:
+	meta_line = find_first_zero_bit(&l_mg->meta_bitmap, PBLK_DATA_LINES);
+	if (meta_line == PBLK_DATA_LINES) {
+		spin_unlock(&l_mg->free_lock);
+		io_schedule();
+		spin_lock(&l_mg->free_lock);
+		goto retry_meta;
+	}
+
+	set_bit(meta_line, &l_mg->meta_bitmap);
+	line->meta_line = meta_line;
+
+	line->smeta = l_mg->sline_meta[meta_line];
+	line->emeta = l_mg->eline_meta[meta_line];
+
+	memset(line->smeta, 0, lm->smeta_len);
+	memset(line->emeta->buf, 0, lm->emeta_len[0]);
+
+	line->emeta->mem = 0;
+	atomic_set(&line->emeta->sync, 0);
+}
+
+/* For now lines are always assumed full lines. Thus, smeta former and current
+ * lun bitmaps are omitted.
+ */
+static int pblk_line_init_metadata(struct pblk *pblk, struct pblk_line *line,
+				  struct pblk_line *cur)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct pblk_emeta *emeta = line->emeta;
+	struct line_emeta *emeta_buf = emeta->buf;
+	struct line_smeta *smeta_buf = (struct line_smeta *)line->smeta;
+	int nr_blk_line;
+
+	/* After erasing the line, new bad blocks might appear and we risk
+	 * having an invalid line
+	 */
+	nr_blk_line = lm->blk_per_line -
+			bitmap_weight(line->blk_bitmap, lm->blk_per_line);
+	if (nr_blk_line < lm->min_blk_line) {
+		spin_lock(&l_mg->free_lock);
+		spin_lock(&line->lock);
+		line->state = PBLK_LINESTATE_BAD;
+		trace_pblk_line_state(pblk_disk_name(pblk), line->id,
+					line->state);
+		spin_unlock(&line->lock);
+
+		list_add_tail(&line->list, &l_mg->bad_list);
+		spin_unlock(&l_mg->free_lock);
+
+		pblk_debug(pblk, "line %d is bad\n", line->id);
+
+		return 0;
+	}
+
+	/* Run-time metadata */
+	line->lun_bitmap = ((void *)(smeta_buf)) + sizeof(struct line_smeta);
+
+	/* Mark LUNs allocated in this line (all for now) */
+	bitmap_set(line->lun_bitmap, 0, lm->lun_bitmap_len);
+
+	smeta_buf->header.identifier = cpu_to_le32(PBLK_MAGIC);
+	guid_copy((guid_t *)&smeta_buf->header.uuid, &pblk->instance_uuid);
+	smeta_buf->header.id = cpu_to_le32(line->id);
+	smeta_buf->header.type = cpu_to_le16(line->type);
+	smeta_buf->header.version_major = SMETA_VERSION_MAJOR;
+	smeta_buf->header.version_minor = SMETA_VERSION_MINOR;
+
+	/* Start metadata */
+	smeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
+	smeta_buf->window_wr_lun = cpu_to_le32(geo->all_luns);
+
+	/* Fill metadata among lines */
+	if (cur) {
+		memcpy(line->lun_bitmap, cur->lun_bitmap, lm->lun_bitmap_len);
+		smeta_buf->prev_id = cpu_to_le32(cur->id);
+		cur->emeta->buf->next_id = cpu_to_le32(line->id);
+	} else {
+		smeta_buf->prev_id = cpu_to_le32(PBLK_LINE_EMPTY);
+	}
+
+	/* All smeta must be set at this point */
+	smeta_buf->header.crc = cpu_to_le32(
+			pblk_calc_meta_header_crc(pblk, &smeta_buf->header));
+	smeta_buf->crc = cpu_to_le32(pblk_calc_smeta_crc(pblk, smeta_buf));
+
+	/* End metadata */
+	memcpy(&emeta_buf->header, &smeta_buf->header,
+						sizeof(struct line_header));
+
+	emeta_buf->header.version_major = EMETA_VERSION_MAJOR;
+	emeta_buf->header.version_minor = EMETA_VERSION_MINOR;
+	emeta_buf->header.crc = cpu_to_le32(
+			pblk_calc_meta_header_crc(pblk, &emeta_buf->header));
+
+	emeta_buf->seq_nr = cpu_to_le64(line->seq_nr);
+	emeta_buf->nr_lbas = cpu_to_le64(line->sec_in_line);
+	emeta_buf->nr_valid_lbas = cpu_to_le64(0);
+	emeta_buf->next_id = cpu_to_le32(PBLK_LINE_EMPTY);
+	emeta_buf->crc = cpu_to_le32(0);
+	emeta_buf->prev_id = smeta_buf->prev_id;
+
+	return 1;
+}
+
+static int pblk_line_alloc_bitmaps(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+
+	line->map_bitmap = mempool_alloc(l_mg->bitmap_pool, GFP_KERNEL);
+	if (!line->map_bitmap)
+		return -ENOMEM;
+
+	memset(line->map_bitmap, 0, lm->sec_bitmap_len);
+
+	/* will be initialized using bb info from map_bitmap */
+	line->invalid_bitmap = mempool_alloc(l_mg->bitmap_pool, GFP_KERNEL);
+	if (!line->invalid_bitmap) {
+		mempool_free(line->map_bitmap, l_mg->bitmap_pool);
+		line->map_bitmap = NULL;
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
+/* For now lines are always assumed full lines. Thus, smeta former and current
+ * lun bitmaps are omitted.
+ */
+static int pblk_line_init_bb(struct pblk *pblk, struct pblk_line *line,
+			     int init)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	u64 off;
+	int bit = -1;
+	int emeta_secs;
+
+	line->sec_in_line = lm->sec_per_line;
+
+	/* Capture bad block information on line mapping bitmaps */
+	while ((bit = find_next_bit(line->blk_bitmap, lm->blk_per_line,
+					bit + 1)) < lm->blk_per_line) {
+		off = bit * geo->ws_opt;
+		bitmap_shift_left(l_mg->bb_aux, l_mg->bb_template, off,
+							lm->sec_per_line);
+		bitmap_or(line->map_bitmap, line->map_bitmap, l_mg->bb_aux,
+							lm->sec_per_line);
+		line->sec_in_line -= geo->clba;
+	}
+
+	/* Mark smeta metadata sectors as bad sectors */
+	bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
+	off = bit * geo->ws_opt;
+	bitmap_set(line->map_bitmap, off, lm->smeta_sec);
+	line->sec_in_line -= lm->smeta_sec;
+	line->cur_sec = off + lm->smeta_sec;
+
+	if (init && pblk_line_smeta_write(pblk, line, off)) {
+		pblk_debug(pblk, "line smeta I/O failed. Retry\n");
+		return 0;
+	}
+
+	bitmap_copy(line->invalid_bitmap, line->map_bitmap, lm->sec_per_line);
+
+	/* Mark emeta metadata sectors as bad sectors. We need to consider bad
+	 * blocks to make sure that there are enough sectors to store emeta
+	 */
+	emeta_secs = lm->emeta_sec[0];
+	off = lm->sec_per_line;
+	while (emeta_secs) {
+		off -= geo->ws_opt;
+		if (!test_bit(off, line->invalid_bitmap)) {
+			bitmap_set(line->invalid_bitmap, off, geo->ws_opt);
+			emeta_secs -= geo->ws_opt;
+		}
+	}
+
+	line->emeta_ssec = off;
+	line->sec_in_line -= lm->emeta_sec[0];
+	line->nr_valid_lbas = 0;
+	line->left_msecs = line->sec_in_line;
+	*line->vsc = cpu_to_le32(line->sec_in_line);
+
+	if (lm->sec_per_line - line->sec_in_line !=
+		bitmap_weight(line->invalid_bitmap, lm->sec_per_line)) {
+		spin_lock(&line->lock);
+		line->state = PBLK_LINESTATE_BAD;
+		trace_pblk_line_state(pblk_disk_name(pblk), line->id,
+					line->state);
+		spin_unlock(&line->lock);
+
+		list_add_tail(&line->list, &l_mg->bad_list);
+		pblk_err(pblk, "unexpected line %d is bad\n", line->id);
+
+		return 0;
+	}
+
+	return 1;
+}
+
+static int pblk_prepare_new_line(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	int blk_to_erase = atomic_read(&line->blk_in_line);
+	int i;
+
+	for (i = 0; i < lm->blk_per_line; i++) {
+		struct pblk_lun *rlun = &pblk->luns[i];
+		int pos = pblk_ppa_to_pos(geo, rlun->bppa);
+		int state = line->chks[pos].state;
+
+		/* Free chunks should not be erased */
+		if (state & NVM_CHK_ST_FREE) {
+			set_bit(pblk_ppa_to_pos(geo, rlun->bppa),
+							line->erase_bitmap);
+			blk_to_erase--;
+		}
+	}
+
+	return blk_to_erase;
+}
+
+static int pblk_line_prepare(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_meta *lm = &pblk->lm;
+	int blk_in_line = atomic_read(&line->blk_in_line);
+	int blk_to_erase;
+
+	/* Bad blocks do not need to be erased */
+	bitmap_copy(line->erase_bitmap, line->blk_bitmap, lm->blk_per_line);
+
+	spin_lock(&line->lock);
+
+	/* If we have not written to this line, we need to mark up free chunks
+	 * as already erased
+	 */
+	if (line->state == PBLK_LINESTATE_NEW) {
+		blk_to_erase = pblk_prepare_new_line(pblk, line);
+		line->state = PBLK_LINESTATE_FREE;
+		trace_pblk_line_state(pblk_disk_name(pblk), line->id,
+					line->state);
+	} else {
+		blk_to_erase = blk_in_line;
+	}
+
+	if (blk_in_line < lm->min_blk_line) {
+		spin_unlock(&line->lock);
+		return -EAGAIN;
+	}
+
+	if (line->state != PBLK_LINESTATE_FREE) {
+		WARN(1, "pblk: corrupted line %d, state %d\n",
+							line->id, line->state);
+		spin_unlock(&line->lock);
+		return -EINTR;
+	}
+
+	line->state = PBLK_LINESTATE_OPEN;
+	trace_pblk_line_state(pblk_disk_name(pblk), line->id,
+				line->state);
+
+	atomic_set(&line->left_eblks, blk_to_erase);
+	atomic_set(&line->left_seblks, blk_to_erase);
+
+	line->meta_distance = lm->meta_distance;
+	spin_unlock(&line->lock);
+
+	kref_init(&line->ref);
+	atomic_set(&line->sec_to_update, 0);
+
+	return 0;
+}
+
+/* Line allocations in the recovery path are always single threaded */
+int pblk_line_recov_alloc(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	int ret;
+
+	spin_lock(&l_mg->free_lock);
+	l_mg->data_line = line;
+	list_del(&line->list);
+
+	ret = pblk_line_prepare(pblk, line);
+	if (ret) {
+		list_add(&line->list, &l_mg->free_list);
+		spin_unlock(&l_mg->free_lock);
+		return ret;
+	}
+	spin_unlock(&l_mg->free_lock);
+
+	ret = pblk_line_alloc_bitmaps(pblk, line);
+	if (ret)
+		goto fail;
+
+	if (!pblk_line_init_bb(pblk, line, 0)) {
+		ret = -EINTR;
+		goto fail;
+	}
+
+	pblk_rl_free_lines_dec(&pblk->rl, line, true);
+	return 0;
+
+fail:
+	spin_lock(&l_mg->free_lock);
+	list_add(&line->list, &l_mg->free_list);
+	spin_unlock(&l_mg->free_lock);
+
+	return ret;
+}
+
+void pblk_line_recov_close(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+
+	mempool_free(line->map_bitmap, l_mg->bitmap_pool);
+	line->map_bitmap = NULL;
+	line->smeta = NULL;
+	line->emeta = NULL;
+}
+
+static void pblk_line_reinit(struct pblk_line *line)
+{
+	*line->vsc = cpu_to_le32(EMPTY_ENTRY);
+
+	line->map_bitmap = NULL;
+	line->invalid_bitmap = NULL;
+	line->smeta = NULL;
+	line->emeta = NULL;
+}
+
+void pblk_line_free(struct pblk_line *line)
+{
+	struct pblk *pblk = line->pblk;
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+
+	mempool_free(line->map_bitmap, l_mg->bitmap_pool);
+	mempool_free(line->invalid_bitmap, l_mg->bitmap_pool);
+
+	pblk_line_reinit(line);
+}
+
+struct pblk_line *pblk_line_get(struct pblk *pblk)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct pblk_line *line;
+	int ret, bit;
+
+	lockdep_assert_held(&l_mg->free_lock);
+
+retry:
+	if (list_empty(&l_mg->free_list)) {
+		pblk_err(pblk, "no free lines\n");
+		return NULL;
+	}
+
+	line = list_first_entry(&l_mg->free_list, struct pblk_line, list);
+	list_del(&line->list);
+	l_mg->nr_free_lines--;
+
+	bit = find_first_zero_bit(line->blk_bitmap, lm->blk_per_line);
+	if (unlikely(bit >= lm->blk_per_line)) {
+		spin_lock(&line->lock);
+		line->state = PBLK_LINESTATE_BAD;
+		trace_pblk_line_state(pblk_disk_name(pblk), line->id,
+					line->state);
+		spin_unlock(&line->lock);
+
+		list_add_tail(&line->list, &l_mg->bad_list);
+
+		pblk_debug(pblk, "line %d is bad\n", line->id);
+		goto retry;
+	}
+
+	ret = pblk_line_prepare(pblk, line);
+	if (ret) {
+		switch (ret) {
+		case -EAGAIN:
+			list_add(&line->list, &l_mg->bad_list);
+			goto retry;
+		case -EINTR:
+			list_add(&line->list, &l_mg->corrupt_list);
+			goto retry;
+		default:
+			pblk_err(pblk, "failed to prepare line %d\n", line->id);
+			list_add(&line->list, &l_mg->free_list);
+			l_mg->nr_free_lines++;
+			return NULL;
+		}
+	}
+
+	return line;
+}
+
+static struct pblk_line *pblk_line_retry(struct pblk *pblk,
+					 struct pblk_line *line)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct pblk_line *retry_line;
+
+retry:
+	spin_lock(&l_mg->free_lock);
+	retry_line = pblk_line_get(pblk);
+	if (!retry_line) {
+		l_mg->data_line = NULL;
+		spin_unlock(&l_mg->free_lock);
+		return NULL;
+	}
+
+	retry_line->map_bitmap = line->map_bitmap;
+	retry_line->invalid_bitmap = line->invalid_bitmap;
+	retry_line->smeta = line->smeta;
+	retry_line->emeta = line->emeta;
+	retry_line->meta_line = line->meta_line;
+
+	pblk_line_reinit(line);
+
+	l_mg->data_line = retry_line;
+	spin_unlock(&l_mg->free_lock);
+
+	pblk_rl_free_lines_dec(&pblk->rl, line, false);
+
+	if (pblk_line_erase(pblk, retry_line))
+		goto retry;
+
+	return retry_line;
+}
+
+static void pblk_set_space_limit(struct pblk *pblk)
+{
+	struct pblk_rl *rl = &pblk->rl;
+
+	atomic_set(&rl->rb_space, 0);
+}
+
+struct pblk_line *pblk_line_get_first_data(struct pblk *pblk)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct pblk_line *line;
+
+	spin_lock(&l_mg->free_lock);
+	line = pblk_line_get(pblk);
+	if (!line) {
+		spin_unlock(&l_mg->free_lock);
+		return NULL;
+	}
+
+	line->seq_nr = l_mg->d_seq_nr++;
+	line->type = PBLK_LINETYPE_DATA;
+	l_mg->data_line = line;
+
+	pblk_line_setup_metadata(line, l_mg, &pblk->lm);
+
+	/* Allocate next line for preparation */
+	l_mg->data_next = pblk_line_get(pblk);
+	if (!l_mg->data_next) {
+		/* If we cannot get a new line, we need to stop the pipeline.
+		 * Only allow as many writes in as we can store safely and then
+		 * fail gracefully
+		 */
+		pblk_set_space_limit(pblk);
+
+		l_mg->data_next = NULL;
+	} else {
+		l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
+		l_mg->data_next->type = PBLK_LINETYPE_DATA;
+	}
+	spin_unlock(&l_mg->free_lock);
+
+	if (pblk_line_alloc_bitmaps(pblk, line))
+		return NULL;
+
+	if (pblk_line_erase(pblk, line)) {
+		line = pblk_line_retry(pblk, line);
+		if (!line)
+			return NULL;
+	}
+
+retry_setup:
+	if (!pblk_line_init_metadata(pblk, line, NULL)) {
+		line = pblk_line_retry(pblk, line);
+		if (!line)
+			return NULL;
+
+		goto retry_setup;
+	}
+
+	if (!pblk_line_init_bb(pblk, line, 1)) {
+		line = pblk_line_retry(pblk, line);
+		if (!line)
+			return NULL;
+
+		goto retry_setup;
+	}
+
+	pblk_rl_free_lines_dec(&pblk->rl, line, true);
+
+	return line;
+}
+
+void pblk_ppa_to_line_put(struct pblk *pblk, struct ppa_addr ppa)
+{
+	struct pblk_line *line;
+
+	line = pblk_ppa_to_line(pblk, ppa);
+	kref_put(&line->ref, pblk_line_put_wq);
+}
+
+void pblk_rq_to_line_put(struct pblk *pblk, struct nvm_rq *rqd)
+{
+	struct ppa_addr *ppa_list = nvm_rq_to_ppa_list(rqd);
+	int i;
+
+	for (i = 0; i < rqd->nr_ppas; i++)
+		pblk_ppa_to_line_put(pblk, ppa_list[i]);
+}
+
+static void pblk_stop_writes(struct pblk *pblk, struct pblk_line *line)
+{
+	lockdep_assert_held(&pblk->l_mg.free_lock);
+
+	pblk_set_space_limit(pblk);
+	pblk->state = PBLK_STATE_STOPPING;
+	trace_pblk_state(pblk_disk_name(pblk), pblk->state);
+}
+
+static void pblk_line_close_meta_sync(struct pblk *pblk)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct pblk_line *line, *tline;
+	LIST_HEAD(list);
+
+	spin_lock(&l_mg->close_lock);
+	if (list_empty(&l_mg->emeta_list)) {
+		spin_unlock(&l_mg->close_lock);
+		return;
+	}
+
+	list_cut_position(&list, &l_mg->emeta_list, l_mg->emeta_list.prev);
+	spin_unlock(&l_mg->close_lock);
+
+	list_for_each_entry_safe(line, tline, &list, list) {
+		struct pblk_emeta *emeta = line->emeta;
+
+		while (emeta->mem < lm->emeta_len[0]) {
+			int ret;
+
+			ret = pblk_submit_meta_io(pblk, line);
+			if (ret) {
+				pblk_err(pblk, "sync meta line %d failed (%d)\n",
+							line->id, ret);
+				return;
+			}
+		}
+	}
+
+	pblk_wait_for_meta(pblk);
+	flush_workqueue(pblk->close_wq);
+}
+
+void __pblk_pipeline_flush(struct pblk *pblk)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	int ret;
+
+	spin_lock(&l_mg->free_lock);
+	if (pblk->state == PBLK_STATE_RECOVERING ||
+					pblk->state == PBLK_STATE_STOPPED) {
+		spin_unlock(&l_mg->free_lock);
+		return;
+	}
+	pblk->state = PBLK_STATE_RECOVERING;
+	trace_pblk_state(pblk_disk_name(pblk), pblk->state);
+	spin_unlock(&l_mg->free_lock);
+
+	pblk_flush_writer(pblk);
+	pblk_wait_for_meta(pblk);
+
+	ret = pblk_recov_pad(pblk);
+	if (ret) {
+		pblk_err(pblk, "could not close data on teardown(%d)\n", ret);
+		return;
+	}
+
+	flush_workqueue(pblk->bb_wq);
+	pblk_line_close_meta_sync(pblk);
+}
+
+void __pblk_pipeline_stop(struct pblk *pblk)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+
+	spin_lock(&l_mg->free_lock);
+	pblk->state = PBLK_STATE_STOPPED;
+	trace_pblk_state(pblk_disk_name(pblk), pblk->state);
+	l_mg->data_line = NULL;
+	l_mg->data_next = NULL;
+	spin_unlock(&l_mg->free_lock);
+}
+
+void pblk_pipeline_stop(struct pblk *pblk)
+{
+	__pblk_pipeline_flush(pblk);
+	__pblk_pipeline_stop(pblk);
+}
+
+struct pblk_line *pblk_line_replace_data(struct pblk *pblk)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct pblk_line *cur, *new = NULL;
+	unsigned int left_seblks;
+
+	new = l_mg->data_next;
+	if (!new)
+		goto out;
+
+	spin_lock(&l_mg->free_lock);
+	cur = l_mg->data_line;
+	l_mg->data_line = new;
+
+	pblk_line_setup_metadata(new, l_mg, &pblk->lm);
+	spin_unlock(&l_mg->free_lock);
+
+retry_erase:
+	left_seblks = atomic_read(&new->left_seblks);
+	if (left_seblks) {
+		/* If line is not fully erased, erase it */
+		if (atomic_read(&new->left_eblks)) {
+			if (pblk_line_erase(pblk, new))
+				goto out;
+		} else {
+			io_schedule();
+		}
+		goto retry_erase;
+	}
+
+	if (pblk_line_alloc_bitmaps(pblk, new))
+		return NULL;
+
+retry_setup:
+	if (!pblk_line_init_metadata(pblk, new, cur)) {
+		new = pblk_line_retry(pblk, new);
+		if (!new)
+			goto out;
+
+		goto retry_setup;
+	}
+
+	if (!pblk_line_init_bb(pblk, new, 1)) {
+		new = pblk_line_retry(pblk, new);
+		if (!new)
+			goto out;
+
+		goto retry_setup;
+	}
+
+	pblk_rl_free_lines_dec(&pblk->rl, new, true);
+
+	/* Allocate next line for preparation */
+	spin_lock(&l_mg->free_lock);
+	l_mg->data_next = pblk_line_get(pblk);
+	if (!l_mg->data_next) {
+		/* If we cannot get a new line, we need to stop the pipeline.
+		 * Only allow as many writes in as we can store safely and then
+		 * fail gracefully
+		 */
+		pblk_stop_writes(pblk, new);
+		l_mg->data_next = NULL;
+	} else {
+		l_mg->data_next->seq_nr = l_mg->d_seq_nr++;
+		l_mg->data_next->type = PBLK_LINETYPE_DATA;
+	}
+	spin_unlock(&l_mg->free_lock);
+
+out:
+	return new;
+}
+
+static void __pblk_line_put(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct pblk_gc *gc = &pblk->gc;
+
+	spin_lock(&line->lock);
+	WARN_ON(line->state != PBLK_LINESTATE_GC);
+	if (line->w_err_gc->has_gc_err) {
+		spin_unlock(&line->lock);
+		pblk_err(pblk, "line %d had errors during GC\n", line->id);
+		pblk_put_line_back(pblk, line);
+		line->w_err_gc->has_gc_err = 0;
+		return;
+	}
+
+	line->state = PBLK_LINESTATE_FREE;
+	trace_pblk_line_state(pblk_disk_name(pblk), line->id,
+					line->state);
+	line->gc_group = PBLK_LINEGC_NONE;
+	pblk_line_free(line);
+
+	if (line->w_err_gc->has_write_err) {
+		pblk_rl_werr_line_out(&pblk->rl);
+		line->w_err_gc->has_write_err = 0;
+	}
+
+	spin_unlock(&line->lock);
+	atomic_dec(&gc->pipeline_gc);
+
+	spin_lock(&l_mg->free_lock);
+	list_add_tail(&line->list, &l_mg->free_list);
+	l_mg->nr_free_lines++;
+	spin_unlock(&l_mg->free_lock);
+
+	pblk_rl_free_lines_inc(&pblk->rl, line);
+}
+
+static void pblk_line_put_ws(struct work_struct *work)
+{
+	struct pblk_line_ws *line_put_ws = container_of(work,
+						struct pblk_line_ws, ws);
+	struct pblk *pblk = line_put_ws->pblk;
+	struct pblk_line *line = line_put_ws->line;
+
+	__pblk_line_put(pblk, line);
+	mempool_free(line_put_ws, &pblk->gen_ws_pool);
+}
+
+void pblk_line_put(struct kref *ref)
+{
+	struct pblk_line *line = container_of(ref, struct pblk_line, ref);
+	struct pblk *pblk = line->pblk;
+
+	__pblk_line_put(pblk, line);
+}
+
+void pblk_line_put_wq(struct kref *ref)
+{
+	struct pblk_line *line = container_of(ref, struct pblk_line, ref);
+	struct pblk *pblk = line->pblk;
+	struct pblk_line_ws *line_put_ws;
+
+	line_put_ws = mempool_alloc(&pblk->gen_ws_pool, GFP_ATOMIC);
+	if (!line_put_ws)
+		return;
+
+	line_put_ws->pblk = pblk;
+	line_put_ws->line = line;
+	line_put_ws->priv = NULL;
+
+	INIT_WORK(&line_put_ws->ws, pblk_line_put_ws);
+	queue_work(pblk->r_end_wq, &line_put_ws->ws);
+}
+
+int pblk_blk_erase_async(struct pblk *pblk, struct ppa_addr ppa)
+{
+	struct nvm_rq *rqd;
+	int err;
+
+	rqd = pblk_alloc_rqd(pblk, PBLK_ERASE);
+
+	pblk_setup_e_rq(pblk, rqd, ppa);
+
+	rqd->end_io = pblk_end_io_erase;
+	rqd->private = pblk;
+
+	trace_pblk_chunk_reset(pblk_disk_name(pblk),
+				&ppa, PBLK_CHUNK_RESET_START);
+
+	/* The write thread schedules erases so that it minimizes disturbances
+	 * with writes. Thus, there is no need to take the LUN semaphore.
+	 */
+	err = pblk_submit_io(pblk, rqd, NULL);
+	if (err) {
+		struct nvm_tgt_dev *dev = pblk->dev;
+		struct nvm_geo *geo = &dev->geo;
+
+		pblk_err(pblk, "could not async erase line:%d,blk:%d\n",
+					pblk_ppa_to_line_id(ppa),
+					pblk_ppa_to_pos(geo, ppa));
+	}
+
+	return err;
+}
+
+struct pblk_line *pblk_line_get_data(struct pblk *pblk)
+{
+	return pblk->l_mg.data_line;
+}
+
+/* For now, always erase next line */
+struct pblk_line *pblk_line_get_erase(struct pblk *pblk)
+{
+	return pblk->l_mg.data_next;
+}
+
+int pblk_line_is_full(struct pblk_line *line)
+{
+	return (line->left_msecs == 0);
+}
+
+static void pblk_line_should_sync_meta(struct pblk *pblk)
+{
+	if (pblk_rl_is_limit(&pblk->rl))
+		pblk_line_close_meta_sync(pblk);
+}
+
+void pblk_line_close(struct pblk *pblk, struct pblk_line *line)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct list_head *move_list;
+	int i;
+
+#ifdef CONFIG_NVM_PBLK_DEBUG
+	WARN(!bitmap_full(line->map_bitmap, lm->sec_per_line),
+				"pblk: corrupt closed line %d\n", line->id);
+#endif
+
+	spin_lock(&l_mg->free_lock);
+	WARN_ON(!test_and_clear_bit(line->meta_line, &l_mg->meta_bitmap));
+	spin_unlock(&l_mg->free_lock);
+
+	spin_lock(&l_mg->gc_lock);
+	spin_lock(&line->lock);
+	WARN_ON(line->state != PBLK_LINESTATE_OPEN);
+	line->state = PBLK_LINESTATE_CLOSED;
+	move_list = pblk_line_gc_list(pblk, line);
+	list_add_tail(&line->list, move_list);
+
+	mempool_free(line->map_bitmap, l_mg->bitmap_pool);
+	line->map_bitmap = NULL;
+	line->smeta = NULL;
+	line->emeta = NULL;
+
+	for (i = 0; i < lm->blk_per_line; i++) {
+		struct pblk_lun *rlun = &pblk->luns[i];
+		int pos = pblk_ppa_to_pos(geo, rlun->bppa);
+		int state = line->chks[pos].state;
+
+		if (!(state & NVM_CHK_ST_OFFLINE))
+			state = NVM_CHK_ST_CLOSED;
+	}
+
+	spin_unlock(&line->lock);
+	spin_unlock(&l_mg->gc_lock);
+
+	trace_pblk_line_state(pblk_disk_name(pblk), line->id,
+					line->state);
+}
+
+void pblk_line_close_meta(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
+	struct pblk_line_meta *lm = &pblk->lm;
+	struct pblk_emeta *emeta = line->emeta;
+	struct line_emeta *emeta_buf = emeta->buf;
+	struct wa_counters *wa = emeta_to_wa(lm, emeta_buf);
+
+	/* No need for exact vsc value; avoid a big line lock and take aprox. */
+	memcpy(emeta_to_vsc(pblk, emeta_buf), l_mg->vsc_list, lm->vsc_list_len);
+	memcpy(emeta_to_bb(emeta_buf), line->blk_bitmap, lm->blk_bitmap_len);
+
+	wa->user = cpu_to_le64(atomic64_read(&pblk->user_wa));
+	wa->pad = cpu_to_le64(atomic64_read(&pblk->pad_wa));
+	wa->gc = cpu_to_le64(atomic64_read(&pblk->gc_wa));
+
+	if (le32_to_cpu(emeta_buf->header.identifier) != PBLK_MAGIC) {
+		emeta_buf->header.identifier = cpu_to_le32(PBLK_MAGIC);
+		guid_copy((guid_t *)&emeta_buf->header.uuid,
+							&pblk->instance_uuid);
+		emeta_buf->header.id = cpu_to_le32(line->id);
+		emeta_buf->header.type = cpu_to_le16(line->type);
+		emeta_buf->header.version_major = EMETA_VERSION_MAJOR;
+		emeta_buf->header.version_minor = EMETA_VERSION_MINOR;
+		emeta_buf->header.crc = cpu_to_le32(
+			pblk_calc_meta_header_crc(pblk, &emeta_buf->header));
+	}
+
+	emeta_buf->nr_valid_lbas = cpu_to_le64(line->nr_valid_lbas);
+	emeta_buf->crc = cpu_to_le32(pblk_calc_emeta_crc(pblk, emeta_buf));
+
+	spin_lock(&l_mg->close_lock);
+	spin_lock(&line->lock);
+
+	/* Update the in-memory start address for emeta, in case it has
+	 * shifted due to write errors
+	 */
+	if (line->emeta_ssec != line->cur_sec)
+		line->emeta_ssec = line->cur_sec;
+
+	list_add_tail(&line->list, &l_mg->emeta_list);
+	spin_unlock(&line->lock);
+	spin_unlock(&l_mg->close_lock);
+
+	pblk_line_should_sync_meta(pblk);
+}
+
+static void pblk_save_lba_list(struct pblk *pblk, struct pblk_line *line)
+{
+	struct pblk_line_meta *lm = &pblk->lm;
+	unsigned int lba_list_size = lm->emeta_len[2];
+	struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
+	struct pblk_emeta *emeta = line->emeta;
+
+	w_err_gc->lba_list = kvmalloc(lba_list_size, GFP_KERNEL);
+	memcpy(w_err_gc->lba_list, emeta_to_lbas(pblk, emeta->buf),
+				lba_list_size);
+}
+
+void pblk_line_close_ws(struct work_struct *work)
+{
+	struct pblk_line_ws *line_ws = container_of(work, struct pblk_line_ws,
+									ws);
+	struct pblk *pblk = line_ws->pblk;
+	struct pblk_line *line = line_ws->line;
+	struct pblk_w_err_gc *w_err_gc = line->w_err_gc;
+
+	/* Write errors makes the emeta start address stored in smeta invalid,
+	 * so keep a copy of the lba list until we've gc'd the line
+	 */
+	if (w_err_gc->has_write_err)
+		pblk_save_lba_list(pblk, line);
+
+	pblk_line_close(pblk, line);
+	mempool_free(line_ws, &pblk->gen_ws_pool);
+}
+
+void pblk_gen_run_ws(struct pblk *pblk, struct pblk_line *line, void *priv,
+		      void (*work)(struct work_struct *), gfp_t gfp_mask,
+		      struct workqueue_struct *wq)
+{
+	struct pblk_line_ws *line_ws;
+
+	line_ws = mempool_alloc(&pblk->gen_ws_pool, gfp_mask);
+
+	line_ws->pblk = pblk;
+	line_ws->line = line;
+	line_ws->priv = priv;
+
+	INIT_WORK(&line_ws->ws, work);
+	queue_work(wq, &line_ws->ws);
+}
+
+static void __pblk_down_chunk(struct pblk *pblk, int pos)
+{
+	struct pblk_lun *rlun = &pblk->luns[pos];
+	int ret;
+
+	/*
+	 * Only send one inflight I/O per LUN. Since we map at a page
+	 * granurality, all ppas in the I/O will map to the same LUN
+	 */
+
+	ret = down_timeout(&rlun->wr_sem, msecs_to_jiffies(30000));
+	if (ret == -ETIME || ret == -EINTR)
+		pblk_err(pblk, "taking lun semaphore timed out: err %d\n",
+				-ret);
+}
+
+void pblk_down_chunk(struct pblk *pblk, struct ppa_addr ppa)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	int pos = pblk_ppa_to_pos(geo, ppa);
+
+	__pblk_down_chunk(pblk, pos);
+}
+
+void pblk_down_rq(struct pblk *pblk, struct ppa_addr ppa,
+		  unsigned long *lun_bitmap)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	int pos = pblk_ppa_to_pos(geo, ppa);
+
+	/* If the LUN has been locked for this same request, do no attempt to
+	 * lock it again
+	 */
+	if (test_and_set_bit(pos, lun_bitmap))
+		return;
+
+	__pblk_down_chunk(pblk, pos);
+}
+
+void pblk_up_chunk(struct pblk *pblk, struct ppa_addr ppa)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	struct pblk_lun *rlun;
+	int pos = pblk_ppa_to_pos(geo, ppa);
+
+	rlun = &pblk->luns[pos];
+	up(&rlun->wr_sem);
+}
+
+void pblk_up_rq(struct pblk *pblk, unsigned long *lun_bitmap)
+{
+	struct nvm_tgt_dev *dev = pblk->dev;
+	struct nvm_geo *geo = &dev->geo;
+	struct pblk_lun *rlun;
+	int num_lun = geo->all_luns;
+	int bit = -1;
+
+	while ((bit = find_next_bit(lun_bitmap, num_lun, bit + 1)) < num_lun) {
+		rlun = &pblk->luns[bit];
+		up(&rlun->wr_sem);
+	}
+}
+
+void pblk_update_map(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
+{
+	struct ppa_addr ppa_l2p;
+
+	/* logic error: lba out-of-bounds. Ignore update */
+	if (!(lba < pblk->capacity)) {
+		WARN(1, "pblk: corrupted L2P map request\n");
+		return;
+	}
+
+	spin_lock(&pblk->trans_lock);
+	ppa_l2p = pblk_trans_map_get(pblk, lba);
+
+	if (!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p))
+		pblk_map_invalidate(pblk, ppa_l2p);
+
+	pblk_trans_map_set(pblk, lba, ppa);
+	spin_unlock(&pblk->trans_lock);
+}
+
+void pblk_update_map_cache(struct pblk *pblk, sector_t lba, struct ppa_addr ppa)
+{
+
+#ifdef CONFIG_NVM_PBLK_DEBUG
+	/* Callers must ensure that the ppa points to a cache address */
+	BUG_ON(!pblk_addr_in_cache(ppa));
+	BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa)));
+#endif
+
+	pblk_update_map(pblk, lba, ppa);
+}
+
+int pblk_update_map_gc(struct pblk *pblk, sector_t lba, struct ppa_addr ppa_new,
+		       struct pblk_line *gc_line, u64 paddr_gc)
+{
+	struct ppa_addr ppa_l2p, ppa_gc;
+	int ret = 1;
+
+#ifdef CONFIG_NVM_PBLK_DEBUG
+	/* Callers must ensure that the ppa points to a cache address */
+	BUG_ON(!pblk_addr_in_cache(ppa_new));
+	BUG_ON(pblk_rb_pos_oob(&pblk->rwb, pblk_addr_to_cacheline(ppa_new)));
+#endif
+
+	/* logic error: lba out-of-bounds. Ignore update */
+	if (!(lba < pblk->capacity)) {
+		WARN(1, "pblk: corrupted L2P map request\n");
+		return 0;
+	}
+
+	spin_lock(&pblk->trans_lock);
+	ppa_l2p = pblk_trans_map_get(pblk, lba);
+	ppa_gc = addr_to_gen_ppa(pblk, paddr_gc, gc_line->id);
+
+	if (!pblk_ppa_comp(ppa_l2p, ppa_gc)) {
+		spin_lock(&gc_line->lock);
+		WARN(!test_bit(paddr_gc, gc_line->invalid_bitmap),
+						"pblk: corrupted GC update");
+		spin_unlock(&gc_line->lock);
+
+		ret = 0;
+		goto out;
+	}
+
+	pblk_trans_map_set(pblk, lba, ppa_new);
+out:
+	spin_unlock(&pblk->trans_lock);
+	return ret;
+}
+
+void pblk_update_map_dev(struct pblk *pblk, sector_t lba,
+			 struct ppa_addr ppa_mapped, struct ppa_addr ppa_cache)
+{
+	struct ppa_addr ppa_l2p;
+
+#ifdef CONFIG_NVM_PBLK_DEBUG
+	/* Callers must ensure that the ppa points to a device address */
+	BUG_ON(pblk_addr_in_cache(ppa_mapped));
+#endif
+	/* Invalidate and discard padded entries */
+	if (lba == ADDR_EMPTY) {
+		atomic64_inc(&pblk->pad_wa);
+#ifdef CONFIG_NVM_PBLK_DEBUG
+		atomic_long_inc(&pblk->padded_wb);
+#endif
+		if (!pblk_ppa_empty(ppa_mapped))
+			pblk_map_invalidate(pblk, ppa_mapped);
+		return;
+	}
+
+	/* logic error: lba out-of-bounds. Ignore update */
+	if (!(lba < pblk->capacity)) {
+		WARN(1, "pblk: corrupted L2P map request\n");
+		return;
+	}
+
+	spin_lock(&pblk->trans_lock);
+	ppa_l2p = pblk_trans_map_get(pblk, lba);
+
+	/* Do not update L2P if the cacheline has been updated. In this case,
+	 * the mapped ppa must be invalidated
+	 */
+	if (!pblk_ppa_comp(ppa_l2p, ppa_cache)) {
+		if (!pblk_ppa_empty(ppa_mapped))
+			pblk_map_invalidate(pblk, ppa_mapped);
+		goto out;
+	}
+
+#ifdef CONFIG_NVM_PBLK_DEBUG
+	WARN_ON(!pblk_addr_in_cache(ppa_l2p) && !pblk_ppa_empty(ppa_l2p));
+#endif
+
+	pblk_trans_map_set(pblk, lba, ppa_mapped);
+out:
+	spin_unlock(&pblk->trans_lock);
+}
+
+int pblk_lookup_l2p_seq(struct pblk *pblk, struct ppa_addr *ppas,
+			 sector_t blba, int nr_secs, bool *from_cache)
+{
+	int i;
+
+	spin_lock(&pblk->trans_lock);
+	for (i = 0; i < nr_secs; i++) {
+		struct ppa_addr ppa;
+
+		ppa = ppas[i] = pblk_trans_map_get(pblk, blba + i);
+
+		/* If the L2P entry maps to a line, the reference is valid */
+		if (!pblk_ppa_empty(ppa) && !pblk_addr_in_cache(ppa)) {
+			struct pblk_line *line = pblk_ppa_to_line(pblk, ppa);
+
+			if (i > 0 && *from_cache)
+				break;
+			*from_cache = false;
+
+			kref_get(&line->ref);
+		} else {
+			if (i > 0 && !*from_cache)
+				break;
+			*from_cache = true;
+		}
+	}
+	spin_unlock(&pblk->trans_lock);
+	return i;
+}
+
+void pblk_lookup_l2p_rand(struct pblk *pblk, struct ppa_addr *ppas,
+			  u64 *lba_list, int nr_secs)
+{
+	u64 lba;
+	int i;
+
+	spin_lock(&pblk->trans_lock);
+	for (i = 0; i < nr_secs; i++) {
+		lba = lba_list[i];
+		if (lba != ADDR_EMPTY) {
+			/* logic error: lba out-of-bounds. Ignore update */
+			if (!(lba < pblk->capacity)) {
+				WARN(1, "pblk: corrupted L2P map request\n");
+				continue;
+			}
+			ppas[i] = pblk_trans_map_get(pblk, lba);
+		}
+	}
+	spin_unlock(&pblk->trans_lock);
+}
+
+void *pblk_get_meta_for_writes(struct pblk *pblk, struct nvm_rq *rqd)
+{
+	void *buffer;
+
+	if (pblk_is_oob_meta_supported(pblk)) {
+		/* Just use OOB metadata buffer as always */
+		buffer = rqd->meta_list;
+	} else {
+		/* We need to reuse last page of request (packed metadata)
+		 * in similar way as traditional oob metadata
+		 */
+		buffer = page_to_virt(
+			rqd->bio->bi_io_vec[rqd->bio->bi_vcnt - 1].bv_page);
+	}
+
+	return buffer;
+}
+
+void pblk_get_packed_meta(struct pblk *pblk, struct nvm_rq *rqd)
+{
+	void *meta_list = rqd->meta_list;
+	void *page;
+	int i = 0;
+
+	if (pblk_is_oob_meta_supported(pblk))
+		return;
+
+	page = page_to_virt(rqd->bio->bi_io_vec[rqd->bio->bi_vcnt - 1].bv_page);
+	/* We need to fill oob meta buffer with data from packed metadata */
+	for (; i < rqd->nr_ppas; i++)
+		memcpy(pblk_get_meta(pblk, meta_list, i),
+			page + (i * sizeof(struct pblk_sec_meta)),
+			sizeof(struct pblk_sec_meta));
+}