linux-kernel - [PATCH AUTOSEL 4.14 22/36] md/raid5-cache: disable reshape completely

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Date:   Mon, 24 Sep 2018 14:49:06 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Shaohua Li <shli@...com>,
        Sasha Levin <Alexander.Levin@...rosoft.com>
Subject: [PATCH AUTOSEL 4.14 22/36] md/raid5-cache: disable reshape completely

From: Shaohua Li <shli@...com>

[ Upstream commit e254de6bcf3f5b6e78a92ac95fb91acef8adfe1a ]

We don't support reshape yet if an array supports log device. Previously we
determine the fact by checking ->log. However, ->log could be NULL after a log
device is removed, but the array is still marked to support log device. Don't
allow reshape in this case too. User can disable log device support by setting
'consistency_policy' to 'resync' then do reshape.

Reported-by: Xiao Ni <xni@...hat.com>
Tested-by: Xiao Ni <xni@...hat.com>
Signed-off-by: Shaohua Li <shli@...com>
Signed-off-by: Sasha Levin <alexander.levin@...rosoft.com>
---
 drivers/md/raid5-log.h | 5 +++++
 drivers/md/raid5.c     | 6 +++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/md/raid5-log.h b/drivers/md/raid5-log.h
index 284578b0a349..5c908c510c77 100644
--- a/drivers/md/raid5-log.h
+++ b/drivers/md/raid5-log.h
@@ -43,6 +43,11 @@ extern void ppl_write_stripe_run(struct r5conf *conf);
 extern void ppl_stripe_write_finished(struct stripe_head *sh);
 extern int ppl_modify_log(struct r5conf *conf, struct md_rdev *rdev, bool add);
 
+static inline bool raid5_has_log(struct r5conf *conf)
+{
+	return test_bit(MD_HAS_JOURNAL, &conf->mddev->flags);
+}
+
 static inline bool raid5_has_ppl(struct r5conf *conf)
 {
 	return test_bit(MD_HAS_PPL, &conf->mddev->flags);
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c
index 5018fb2352c2..dbf51b4c21b3 100644
--- a/drivers/md/raid5.c
+++ b/drivers/md/raid5.c
@@ -736,7 +736,7 @@ static bool stripe_can_batch(struct stripe_head *sh)
 {
 	struct r5conf *conf = sh->raid_conf;
 
-	if (conf->log || raid5_has_ppl(conf))
+	if (raid5_has_log(conf) || raid5_has_ppl(conf))
 		return false;
 	return test_bit(STRIPE_BATCH_READY, &sh->state) &&
 		!test_bit(STRIPE_BITMAP_PENDING, &sh->state) &&
@@ -7717,7 +7717,7 @@ static int raid5_resize(struct mddev *mddev, sector_t sectors)
 	sector_t newsize;
 	struct r5conf *conf = mddev->private;
 
-	if (conf->log || raid5_has_ppl(conf))
+	if (raid5_has_log(conf) || raid5_has_ppl(conf))
 		return -EINVAL;
 	sectors &= ~((sector_t)conf->chunk_sectors - 1);
 	newsize = raid5_size(mddev, sectors, mddev->raid_disks);
@@ -7768,7 +7768,7 @@ static int check_reshape(struct mddev *mddev)
 {
 	struct r5conf *conf = mddev->private;
 
-	if (conf->log || raid5_has_ppl(conf))
+	if (raid5_has_log(conf) || raid5_has_ppl(conf))
 		return -EINVAL;
 	if (mddev->delta_disks == 0 &&
 	    mddev->new_layout == mddev->layout &&
-- 
2.17.1