linux-kernel - [GIT PULL 16/26] lightnvm: pblk: fix update line wp in OOB recovery

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Date:   Sat,  4 May 2019 20:38:01 +0200
From:   Matias Bjørling <mb@...htnvm.io>
To:     axboe@...com
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Igor Konopko <igor.j.konopko@...el.com>,
        Matias Bjørling <mb@...htnvm.io>
Subject: [GIT PULL 16/26] lightnvm: pblk: fix update line wp in OOB recovery

From: Igor Konopko <igor.j.konopko@...el.com>

In case of OOB recovery, we can hit the scenario when all the data in
line were written and some part of emeta was written too. In such
a case pblk_update_line_wp() function will call pblk_alloc_page()
function which will case to set left_msecs to value below zero
(since this field does not track emeta region) and thus will lead to
multiple kernel warnings. This patch fixes that issue.

Signed-off-by: Igor Konopko <igor.j.konopko@...el.com>
Reviewed-by: Javier González <javier@...igon.com>
Signed-off-by: Matias Bjørling <mb@...htnvm.io>
---
 drivers/lightnvm/pblk-recovery.c | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/drivers/lightnvm/pblk-recovery.c b/drivers/lightnvm/pblk-recovery.c
index 017874e03253..357e52980f2f 100644
--- a/drivers/lightnvm/pblk-recovery.c
+++ b/drivers/lightnvm/pblk-recovery.c
@@ -93,10 +93,24 @@ static int pblk_recov_l2p_from_emeta(struct pblk *pblk, struct pblk_line *line)
 static void pblk_update_line_wp(struct pblk *pblk, struct pblk_line *line,
 				u64 written_secs)
 {
+	struct pblk_line_mgmt *l_mg = &pblk->l_mg;
 	int i;
 
 	for (i = 0; i < written_secs; i += pblk->min_write_pgs)
-		pblk_alloc_page(pblk, line, pblk->min_write_pgs);
+		__pblk_alloc_page(pblk, line, pblk->min_write_pgs);
+
+	spin_lock(&l_mg->free_lock);
+	if (written_secs > line->left_msecs) {
+		/*
+		 * We have all data sectors written
+		 * and some emeta sectors written too.
+		 */
+		line->left_msecs = 0;
+	} else {
+		/* We have only some data sectors written. */
+		line->left_msecs -= written_secs;
+	}
+	spin_unlock(&l_mg->free_lock);
 }
 
 static u64 pblk_sec_in_open_line(struct pblk *pblk, struct pblk_line *line)
-- 
2.19.1