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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>
This commit is contained in:
Heinz Mauelshagen 2017-12-02 01:03:49 +01:00 committed by Mike Snitzer
parent 1af2048a3e
commit 052b2b1e06
1 changed files with 38 additions and 4 deletions
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42
drivers/md/dm-raid.c
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@ -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;
}