[PATCH v2 01/16] lightnvm: pblk: warn when there are opened chunks

[Igor Konopko <igor.j.konopko@xxxxxxxxx>]

In case of factory pblk init, we might have a situation when there are
some opened chunks. Based on OCSSD spec we are not allowed to transform
chunks from the open state directly to the free state, so such a reset
can lead to IO error (even that most of the controller will allow for
for such a operation anyway), so we would like to warn users about such
a situation at least.

Signed-off-by: Igor Konopko <igor.j.konopko@xxxxxxxxx>
Reviewed-by: Javier González <javier@xxxxxxxxxxx>
---
 drivers/lightnvm/pblk-init.c | 22 +++++++++++++++-------
 1 file changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 1e227a0..e2e1193 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -712,7 +712,7 @@ static int pblk_set_provision(struct pblk *pblk, int nr_free_chks)
 }
 
 static int pblk_setup_line_meta_chk(struct pblk *pblk, struct pblk_line *line,
-				   struct nvm_chk_meta *meta)
+				   struct nvm_chk_meta *meta, int *opened)
 {
 	struct nvm_tgt_dev *dev = pblk->dev;
 	struct nvm_geo *geo = &dev->geo;
@@ -748,6 +748,9 @@ static int pblk_setup_line_meta_chk(struct pblk *pblk, struct pblk_line *line,
 			continue;
 		}
 
+		if (chunk->state & NVM_CHK_ST_OPEN)
+			(*opened)++;
+
 		if (!(chunk->state & NVM_CHK_ST_OFFLINE))
 			continue;
 
@@ -759,7 +762,7 @@ static int pblk_setup_line_meta_chk(struct pblk *pblk, struct pblk_line *line,
 }
 
 static long pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
-				 void *chunk_meta, int line_id)
+				 void *chunk_meta, int line_id, int *opened)
 {
 	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 	struct pblk_line_meta *lm = &pblk->lm;
@@ -773,7 +776,7 @@ static long pblk_setup_line_meta(struct pblk *pblk, struct pblk_line *line,
 	line->vsc = &l_mg->vsc_list[line_id];
 	spin_lock_init(&line->lock);
 
-	nr_bad_chks = pblk_setup_line_meta_chk(pblk, line, chunk_meta);
+	nr_bad_chks = pblk_setup_line_meta_chk(pblk, line, chunk_meta, opened);
 
 	chk_in_line = lm->blk_per_line - nr_bad_chks;
 	if (nr_bad_chks < 0 || nr_bad_chks > lm->blk_per_line ||
@@ -1019,12 +1022,12 @@ static int pblk_line_meta_init(struct pblk *pblk)
 	return 0;
 }
 
-static int pblk_lines_init(struct pblk *pblk)
+static int pblk_lines_init(struct pblk *pblk, bool factory)
 {
 	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 	struct pblk_line *line;
 	void *chunk_meta;
-	int nr_free_chks = 0;
+	int nr_free_chks = 0, nr_opened_chks = 0;
 	int i, ret;
 
 	ret = pblk_line_meta_init(pblk);
@@ -1059,7 +1062,8 @@ static int pblk_lines_init(struct pblk *pblk)
 		if (ret)
 			goto fail_free_lines;
 
-		nr_free_chks += pblk_setup_line_meta(pblk, line, chunk_meta, i);
+		nr_free_chks += pblk_setup_line_meta(pblk, line, chunk_meta, i,
+							&nr_opened_chks);
 
 		trace_pblk_line_state(pblk_disk_name(pblk), line->id,
 								line->state);
@@ -1071,6 +1075,10 @@ static int pblk_lines_init(struct pblk *pblk)
 		goto fail_free_lines;
 	}
 
+	if (factory && nr_opened_chks)
+		pblk_warn(pblk, "%d opened chunks during factory creation\n",
+				nr_opened_chks);
+
 	ret = pblk_set_provision(pblk, nr_free_chks);
 	if (ret)
 		goto fail_free_lines;
@@ -1235,7 +1243,7 @@ static void *pblk_init(struct nvm_tgt_dev *dev, struct gendisk *tdisk,
 		goto fail;
 	}
 
-	ret = pblk_lines_init(pblk);
+	ret = pblk_lines_init(pblk, flags & NVM_TARGET_FACTORY);
 	if (ret) {
 		pblk_err(pblk, "could not initialize lines\n");
 		goto fail_free_core;
-- 
2.9.5