linux-kernel - [PATCH AUTOSEL for 4.14 127/135] lightnvm: pblk: fix changing GC group list for a line

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Date:   Thu, 7 Dec 2017 15:46:02 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Rakesh Pandit <rakesh@...era.com>,
        Matias Bjørling <m@...rling.me>,
        Jens Axboe <axboe@...nel.dk>, alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 4.14 127/135] lightnvm: pblk: fix changing GC
 group list for a line

From: Rakesh Pandit <rakesh@...era.com>

[ Upstream commit 27b978725d895e704aab44b99242a0514485d798 ]

pblk_line_gc_list seems to had a bug since the introduction of pblk in
getting GC list for a line. In b20ba1bc7 while redesigning the GC
algorithm, the naming for the GC thresholds was altered, but the
values for high_thrs and mid_thrs were not. The result is that when
moving to the GC lists, the mid threshold is never evaluated.

Fixes: a4bd217b4("lightnvm: physical block device (pblk) target")
Signed-off-by: Rakesh Pandit <rakesh@...era.com>
Signed-off-by: Matias Bjørling <m@...rling.me>
Signed-off-by: Jens Axboe <axboe@...nel.dk>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/lightnvm/pblk-init.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c
index 1a01f201e9e7..8ccfb95a72ff 100644
--- a/drivers/lightnvm/pblk-init.c
+++ b/drivers/lightnvm/pblk-init.c
@@ -681,8 +681,8 @@ static int pblk_lines_init(struct pblk *pblk)
 	lm->blk_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long);
 	lm->sec_bitmap_len = BITS_TO_LONGS(lm->sec_per_line) * sizeof(long);
 	lm->lun_bitmap_len = BITS_TO_LONGS(geo->nr_luns) * sizeof(long);
-	lm->high_thrs = lm->sec_per_line / 2;
-	lm->mid_thrs = lm->sec_per_line / 4;
+	lm->mid_thrs = lm->sec_per_line / 2;
+	lm->high_thrs = lm->sec_per_line / 4;
 	lm->meta_distance = (geo->nr_luns / 2) * pblk->min_write_pgs;
 
 	/* Calculate necessary pages for smeta. See comment over struct
-- 
2.11.0