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md: be cautious about using ->curr_resync_completed for ->recovery_offset

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The ->recovery_offset shows how much of a non-InSync device is actually
in sync - how much has been recoveryed.

When performing a recovery, ->curr_resync and ->curr_resync_completed
follow the device address being recovered and so can be used to update
->recovery_offset.

When performing a reshape, ->curr_resync* might follow the device
addresses (raid5) or might follow array addresses (raid10), so cannot
in general be used to set ->recovery_offset.  When reshaping backwards,
->curre_resync* measures from the *end* of the array-or-device, so is
particularly unhelpful.

So change the common code in md.c to only use ->curr_resync_complete
for the simple recovery case, and add code to raid5.c to update
->recovery_offset during a forwards reshape.

Signed-off-by: NeilBrown <neilb@suse.com>
Signed-off-by: Shaohua Li <shli@fb.com>
This commit is contained in:
NeilBrown 2017-10-17 16:18:36 +11:00 committed by Shaohua Li
parent 39b4954c0a
commit db0505d320
2 changed files with 46 additions and 11 deletions
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33
drivers/md/md.c
View File

@ -2454,10 +2454,18 @@ repeat:
}
}
/* First make sure individual recovery_offsets are correct */
/*
* First make sure individual recovery_offsets are correct
* curr_resync_completed can only be used during recovery.
* During reshape/resync it might use array-addresses rather
* that device addresses.
*/
rdev_for_each(rdev, mddev) {
if (rdev->raid_disk >= 0 &&
mddev->delta_disks >= 0 &&
test_bit(MD_RECOVERY_RUNNING, &mddev->recovery) &&
test_bit(MD_RECOVERY_RECOVER, &mddev->recovery) &&
!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
!test_bit(Journal, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags) &&
mddev->curr_resync_completed > rdev->recovery_offset)
@ -8491,16 +8499,19 @@ void md_do_sync(struct md_thread *thread)
} else {
if (!test_bit(MD_RECOVERY_INTR, &mddev->recovery))
mddev->curr_resync = MaxSector;
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev)
if (rdev->raid_disk >= 0 &&
mddev->delta_disks >= 0 &&
!test_bit(Journal, &rdev->flags) &&
!test_bit(Faulty, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags) &&
rdev->recovery_offset < mddev->curr_resync)
rdev->recovery_offset = mddev->curr_resync;
rcu_read_unlock();
if (!test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
test_bit(MD_RECOVERY_RECOVER, &mddev->recovery)) {
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev)
if (rdev->raid_disk >= 0 &&
mddev->delta_disks >= 0 &&
!test_bit(Journal, &rdev->flags) &&
!test_bit(Faulty, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags) &&
rdev->recovery_offset < mddev->curr_resync)
rdev->recovery_offset = mddev->curr_resync;
rcu_read_unlock();
}
}
}
skip:

24
drivers/md/raid5.c
View File

@ -5738,6 +5738,7 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
*/
struct r5conf *conf = mddev->private;
struct stripe_head *sh;
struct md_rdev *rdev;
sector_t first_sector, last_sector;
int raid_disks = conf->previous_raid_disks;
int data_disks = raid_disks - conf->max_degraded;
@ -5860,6 +5861,15 @@ static sector_t reshape_request(struct mddev *mddev, sector_t sector_nr, int *sk
return 0;
mddev->reshape_position = conf->reshape_progress;
mddev->curr_resync_completed = sector_nr;
if (!mddev->reshape_backwards)
/* Can update recovery_offset */
rdev_for_each(rdev, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Journal, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags) &&
rdev->recovery_offset < sector_nr)
rdev->recovery_offset = sector_nr;
conf->reshape_checkpoint = jiffies;
set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
md_wakeup_thread(mddev->thread);
@ -5958,6 +5968,14 @@ finish:
goto ret;
mddev->reshape_position = conf->reshape_progress;
mddev->curr_resync_completed = sector_nr;
if (!mddev->reshape_backwards)
/* Can update recovery_offset */
rdev_for_each(rdev, mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Journal, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags) &&
rdev->recovery_offset < sector_nr)
rdev->recovery_offset = sector_nr;
conf->reshape_checkpoint = jiffies;
set_bit(MD_SB_CHANGE_DEVS, &mddev->sb_flags);
md_wakeup_thread(mddev->thread);
@ -7945,6 +7963,7 @@ static void end_reshape(struct r5conf *conf)
{
if (!test_bit(MD_RECOVERY_INTR, &conf->mddev->recovery)) {
struct md_rdev *rdev;
spin_lock_irq(&conf->device_lock);
conf->previous_raid_disks = conf->raid_disks;
@ -7952,6 +7971,11 @@ static void end_reshape(struct r5conf *conf)
smp_wmb();
conf->reshape_progress = MaxSector;
conf->mddev->reshape_position = MaxSector;
rdev_for_each(rdev, conf->mddev)
if (rdev->raid_disk >= 0 &&
!test_bit(Journal, &rdev->flags) &&
!test_bit(In_sync, &rdev->flags))
rdev->recovery_offset = MaxSector;
spin_unlock_irq(&conf->device_lock);
wake_up(&conf->wait_for_overlap);