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dm cache: dirty flag was mistakenly being cleared when promoting via overwrite

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If the incoming bio is a WRITE and completely covers a block then we
don't bother to do any copying for a promotion operation.  Once this is
done the cache block and origin block will be different, so we need to
set it to 'dirty'.

Signed-off-by: Joe Thornber <ejt@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Cc: stable@vger.kernel.org
This commit is contained in:
Joe Thornber
2014-11-27 12:26:46 +00:00
committed by Mike Snitzer
parent f29a3147e2
commit 1e32134a5a
1 changed files with 7 additions and 3 deletions
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8
drivers/md/dm-cache-target.c
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@@ -988,10 +988,14 @@ static void migration_success_post_commit(struct dm_cache_migration *mg)
} }
} else { } else {
if (mg->requeue_holder) {
clear_dirty(cache, mg->new_oblock, mg->cblock); clear_dirty(cache, mg->new_oblock, mg->cblock);
if (mg->requeue_holder)
cell_defer(cache, mg->new_ocell, true); cell_defer(cache, mg->new_ocell, true);
else { } else {
/*
* The block was promoted via an overwrite, so it's dirty.
*/
set_dirty(cache, mg->new_oblock, mg->cblock);
bio_endio(mg->new_ocell->holder, 0); bio_endio(mg->new_ocell->holder, 0);
cell_defer(cache, mg->new_ocell, false); cell_defer(cache, mg->new_ocell, false);
} }