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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org, Heinz Mauelshagen <heinzm@redhat.com>,
        Mike Snitzer <snitzer@redhat.com>,
        Sasha Levin <alexander.levin@microsoft.com>
Subject: [PATCH 4.14 086/109] dm raid: fix raid set size revalidation
Date:   Fri, 16 Mar 2018 16:23:55 +0100
Message-Id: <20180316152334.604059087@linuxfoundation.org>
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4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Heinz Mauelshagen <heinzm@redhat.com>


[ Upstream commit 61e06e2c3ebd986050958513bfa40dceed756f8f ]

The raid set size is being revalidated unconditionally before a
reshaping conversion is started.  MD requires the size to only be
reduced in case of a stripe removing (i.e. shrinking) reshape but not
when growing because the raid array has to stay small until after the
growing reshape finishes.

Fix by avoiding the size revalidation in preresume unless a shrinking
reshape is requested.

Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
 drivers/md/dm-raid.c |   30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -675,15 +675,11 @@ static struct raid_type *get_raid_type_b
 	return NULL;
 }
 
-/*
- * Conditionally change bdev capacity of @rs
- * in case of a disk add/remove reshape
- */
-static void rs_set_capacity(struct raid_set *rs)
+/* Adjust rdev sectors */
+static void rs_set_rdev_sectors(struct raid_set *rs)
 {
 	struct mddev *mddev = &rs->md;
 	struct md_rdev *rdev;
-	struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table));
 
 	/*
 	 * raid10 sets rdev->sector to the device size, which
@@ -692,8 +688,16 @@ static void rs_set_capacity(struct raid_
 	rdev_for_each(rdev, mddev)
 		if (!test_bit(Journal, &rdev->flags))
 			rdev->sectors = mddev->dev_sectors;
+}
 
-	set_capacity(gendisk, mddev->array_sectors);
+/*
+ * Change bdev capacity of @rs in case of a disk add/remove reshape
+ */
+static void rs_set_capacity(struct raid_set *rs)
+{
+	struct gendisk *gendisk = dm_disk(dm_table_get_md(rs->ti->table));
+
+	set_capacity(gendisk, rs->md.array_sectors);
 	revalidate_disk(gendisk);
 }
 
@@ -1674,8 +1678,11 @@ static void do_table_event(struct work_s
 	struct raid_set *rs = container_of(ws, struct raid_set, md.event_work);
 
 	smp_rmb(); /* Make sure we access most actual mddev properties */
-	if (!rs_is_reshaping(rs))
+	if (!rs_is_reshaping(rs)) {
+		if (rs_is_raid10(rs))
+			rs_set_rdev_sectors(rs);
 		rs_set_capacity(rs);
+	}
 	dm_table_event(rs->ti->table);
 }
 
@@ -3845,11 +3852,10 @@ static int raid_preresume(struct dm_targ
 		mddev->resync_min = mddev->recovery_cp;
 	}
 
-	rs_set_capacity(rs);
-
 	/* Check for any reshape request unless new raid set */
 	if (test_and_clear_bit(RT_FLAG_RESHAPE_RS, &rs->runtime_flags)) {
 		/* Initiate a reshape. */
+		rs_set_rdev_sectors(rs);
 		mddev_lock_nointr(mddev);
 		r = rs_start_reshape(rs);
 		mddev_unlock(mddev);
@@ -3878,6 +3884,10 @@ static void raid_resume(struct dm_target
 	mddev->ro = 0;
 	mddev->in_sync = 0;
 
+	/* Only reduce raid set size before running a disk removing reshape. */
+	if (mddev->delta_disks < 0)
+		rs_set_capacity(rs);
+
 	/*
 	 * Keep the RAID set frozen if reshape/rebuild flags are set.
 	 * The RAID set is unfrozen once the next table load/resume,