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md/raid5: reshape using largest of old and new chunk size

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This ensures that even when old and new stripes are overlapping,
we will try to read all of the old before having to write any
of the new.

Signed-off-by: NeilBrown <neilb@suse.de>
This commit is contained in:
NeilBrown 2009-03-31 15:21:40 +11:00
parent e183eaedd5
commit 7a66138107
1 changed files with 22 additions and 12 deletions
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34
drivers/md/raid5.c
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@ -3738,6 +3738,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
int dd_idx;
sector_t writepos, safepos, gap;
sector_t stripe_addr;
int reshape_sectors;
if (sector_nr == 0) {
/* If restarting in the middle, skip the initial sectors */
@ -3755,6 +3756,15 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
}
}
/* We need to process a full chunk at a time.
* If old and new chunk sizes differ, we need to process the
* largest of these
*/
if (mddev->new_chunk > mddev->chunk_size)
reshape_sectors = mddev->new_chunk / 512;
else
reshape_sectors = mddev->chunk_size / 512;
/* we update the metadata when there is more than 3Meg
* in the block range (that is rather arbitrary, should
* probably be time based) or when the data about to be
@ -3768,12 +3778,12 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
safepos = conf->reshape_safe;
sector_div(safepos, data_disks);
if (mddev->delta_disks < 0) {
writepos -= conf->chunk_size/512;
safepos += conf->chunk_size/512;
writepos -= reshape_sectors;
safepos += reshape_sectors;
gap = conf->reshape_safe - conf->reshape_progress;
} else {
writepos += conf->chunk_size/512;
safepos -= conf->chunk_size/512;
writepos += reshape_sectors;
safepos -= reshape_sectors;
gap = conf->reshape_progress - conf->reshape_safe;
}
@ -3799,14 +3809,14 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
BUG_ON(conf->reshape_progress == 0);
stripe_addr = writepos;
BUG_ON((mddev->dev_sectors &
~((sector_t)conf->chunk_size / 512 - 1))
- (conf->chunk_size / 512) - stripe_addr
~((sector_t)reshape_sectors - 1))
- reshape_sectors - stripe_addr
!= sector_nr);
} else {
BUG_ON(writepos != sector_nr + conf->chunk_size / 512);
BUG_ON(writepos != sector_nr + reshape_sectors);
stripe_addr = sector_nr;
}
for (i=0; i < conf->chunk_size/512; i+= STRIPE_SECTORS) {
for (i = 0; i < reshape_sectors; i += STRIPE_SECTORS) {
int j;
int skipped = 0;
sh = get_active_stripe(conf, stripe_addr+i, 0, 0);
@ -3839,9 +3849,9 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
}
spin_lock_irq(&conf->device_lock);
if (mddev->delta_disks < 0)
conf->reshape_progress -= i * new_data_disks;
conf->reshape_progress -= reshape_sectors * new_data_disks;
else
conf->reshape_progress += i * new_data_disks;
conf->reshape_progress += reshape_sectors * new_data_disks;
spin_unlock_irq(&conf->device_lock);
/* Ok, those stripe are ready. We can start scheduling
* reads on the source stripes.
@ -3867,7 +3877,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
/* If this takes us to the resync_max point where we have to pause,
* then we need to write out the superblock.
*/
sector_nr += conf->chunk_size>>9;
sector_nr += reshape_sectors;
if (sector_nr >= mddev->resync_max) {
/* Cannot proceed until we've updated the superblock... */
wait_event(conf->wait_for_overlap,
@ -3883,7 +3893,7 @@ static sector_t reshape_request(mddev_t *mddev, sector_t sector_nr, int *skipped
spin_unlock_irq(&conf->device_lock);
wake_up(&conf->wait_for_overlap);
}
return conf->chunk_size>>9;
return reshape_sectors;
}
/* FIXME go_faster isn't used */