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authorHeinz Mauelshagen <heinzm@redhat.com>2017-12-02 01:03:49 +0100
committerMike Snitzer <snitzer@redhat.com>2017-12-08 10:59:57 -0500
commit052b2b1e0689b30af2608d908916a16e9dbd0919 (patch)
treeed7a0895b39a80405dcd88d372ec812a73748304 /drivers/md/dm-raid.c
parent1af2048a3e87b4e982c53ad8cfb0c75d1a9c0a73 (diff)
downloadlinux-052b2b1e0689b30af2608d908916a16e9dbd0919.tar.bz2
dm raid: consume sizes after md_finish_reshape() completes changing them
The md raid personalities call md_finish_reshape() at the end of a reshape conversion which adjusts rdev->sectors. Correct/check rdev->sectors before initiating a reshape and raise the recovery pointer accordingly. Otherwise, the DM raid coordinated reshape will fail. Signed-off-by: Heinz Mauelshagen <heinzm@redhat.com> Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Diffstat (limited to 'drivers/md/dm-raid.c')
-rw-r--r--drivers/md/dm-raid.c42
1 files changed, 38 insertions, 4 deletions
diff --git a/drivers/md/dm-raid.c b/drivers/md/dm-raid.c
index 398314b6c31a..c3ea4337bf51 100644
--- a/drivers/md/dm-raid.c
+++ b/drivers/md/dm-raid.c
@@ -2640,12 +2640,19 @@ static int rs_adjust_data_offsets(struct raid_set *rs)
* Make sure we got a minimum amount of free sectors per device
*/
if (rs->data_offset &&
- to_sector(i_size_read(rdev->bdev->bd_inode)) - rdev->sectors < MIN_FREE_RESHAPE_SPACE) {
+ to_sector(i_size_read(rdev->bdev->bd_inode)) - rs->md.dev_sectors < MIN_FREE_RESHAPE_SPACE) {
rs->ti->error = data_offset ? "No space for forward reshape" :
"No space for backward reshape";
return -ENOSPC;
}
out:
+ /*
+ * Raise recovery_cp in case data_offset != 0 to
+ * avoid false recovery positives in the constructor.
+ */
+ if (rs->md.recovery_cp < rs->md.dev_sectors)
+ rs->md.recovery_cp += rs->dev[0].rdev.data_offset;
+
/* Adjust data offsets on all rdevs but on any raid4/5/6 journal device */
rdev_for_each(rdev, &rs->md) {
if (!test_bit(Journal, &rdev->flags)) {
@@ -2777,6 +2784,23 @@ static int rs_prepare_reshape(struct raid_set *rs)
return 0;
}
+/* Get reshape sectors from data_offsets or raid set */
+static sector_t _get_reshape_sectors(struct raid_set *rs)
+{
+ struct md_rdev *rdev;
+ sector_t reshape_sectors = 0;
+
+ rdev_for_each(rdev, &rs->md)
+ if (!test_bit(Journal, &rdev->flags)) {
+ reshape_sectors = (rdev->data_offset > rdev->new_data_offset) ?
+ rdev->data_offset - rdev->new_data_offset :
+ rdev->new_data_offset - rdev->data_offset;
+ break;
+ }
+
+ return max(reshape_sectors, (sector_t) rs->data_offset);
+}
+
/*
*
* - change raid layout
@@ -2788,6 +2812,7 @@ static int rs_setup_reshape(struct raid_set *rs)
{
int r = 0;
unsigned int cur_raid_devs, d;
+ sector_t reshape_sectors = _get_reshape_sectors(rs);
struct mddev *mddev = &rs->md;
struct md_rdev *rdev;
@@ -2804,13 +2829,13 @@ static int rs_setup_reshape(struct raid_set *rs)
/*
* Adjust array size:
*
- * - in case of adding disks, array size has
+ * - in case of adding disk(s), array size has
* to grow after the disk adding reshape,
* which'll hapen in the event handler;
* reshape will happen forward, so space has to
* be available at the beginning of each disk
*
- * - in case of removing disks, array size
+ * - in case of removing disk(s), array size
* has to shrink before starting the reshape,
* which'll happen here;
* reshape will happen backward, so space has to
@@ -2841,7 +2866,7 @@ static int rs_setup_reshape(struct raid_set *rs)
rdev->recovery_offset = rs_is_raid1(rs) ? 0 : MaxSector;
}
- mddev->reshape_backwards = 0; /* adding disks -> forward reshape */
+ mddev->reshape_backwards = 0; /* adding disk(s) -> forward reshape */
/* Remove disk(s) */
} else if (rs->delta_disks < 0) {
@@ -2874,6 +2899,15 @@ static int rs_setup_reshape(struct raid_set *rs)
mddev->reshape_backwards = rs->dev[0].rdev.data_offset ? 0 : 1;
}
+ /*
+ * Adjust device size for forward reshape
+ * because md_finish_reshape() reduces it.
+ */
+ if (!mddev->reshape_backwards)
+ rdev_for_each(rdev, &rs->md)
+ if (!test_bit(Journal, &rdev->flags))
+ rdev->sectors += reshape_sectors;
+
return r;
}