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| author | NeilBrown <neilb@suse.de> | 2012-05-20 23:27:00 (GMT) |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2012-05-20 23:27:00 (GMT) |
| commit | c6563a8c38fde3c1c7fc925a10bde3ca20799301 (patch) | |
| tree | 3916ae8247149a9dcf39ee1ca262f97be39071eb /drivers/md/raid5.c | |
| parent | 2c810cddc44d6f95cef75df3f07fc0850ff92417 (diff) | |
| download | linux-c6563a8c38fde3c1c7fc925a10bde3ca20799301.tar.xz | |
md: add possibility to change data-offset for devices.
When reshaping we can avoid costly intermediate backup by
changing the 'start' address of the array on the device
(if there is enough room).
So as a first step, allow such a change to be requested
through sysfs, and recorded in v1.x metadata.
(As we didn't previous check that all 'pad' fields were zero,
we need a new FEATURE flag for this.
A (belatedly) check that all remaining 'pad' fields are
zero to avoid a repeat of this)
The new data offset must be requested separately for each device.
This allows each to have a different change in the data offset.
This is not likely to be used often but as data_offset can be
set per-device, new_data_offset should be too.
This patch also removes the 'acknowledged' arg to rdev_set_badblocks as
it is never used and never will be. At the same time we add a new
arg ('in_new') which is currently always zero but will be used more
soon.
When a reshape finishes we will need to update the data_offset
and rdev->sectors. So provide an exported function to do that.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'drivers/md/raid5.c')
| -rw-r--r-- | drivers/md/raid5.c | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/drivers/md/raid5.c b/drivers/md/raid5.c index 0abbd34..3705585 100644 --- a/drivers/md/raid5.c +++ b/drivers/md/raid5.c @@ -3561,7 +3561,7 @@ finish: if (test_and_clear_bit(R5_MadeGood, &dev->flags)) { rdev = conf->disks[i].rdev; rdev_clear_badblocks(rdev, sh->sector, - STRIPE_SECTORS); + STRIPE_SECTORS, 0); rdev_dec_pending(rdev, conf->mddev); } if (test_and_clear_bit(R5_MadeGoodRepl, &dev->flags)) { @@ -3570,7 +3570,7 @@ finish: /* rdev have been moved down */ rdev = conf->disks[i].rdev; rdev_clear_badblocks(rdev, sh->sector, - STRIPE_SECTORS); + STRIPE_SECTORS, 0); rdev_dec_pending(rdev, conf->mddev); } } @@ -5505,10 +5505,14 @@ static int raid5_start_reshape(struct mddev *mddev) if (!check_stripe_cache(mddev)) return -ENOSPC; - rdev_for_each(rdev, mddev) + rdev_for_each(rdev, mddev) { + /* Don't support changing data_offset yet */ + if (rdev->new_data_offset != rdev->data_offset) + return -EINVAL; if (!test_bit(In_sync, &rdev->flags) && !test_bit(Faulty, &rdev->flags)) spares++; + } if (spares - mddev->degraded < mddev->delta_disks - conf->max_degraded) /* Not enough devices even to make a degraded array |