43 lines
1.3 KiB
Diff
43 lines
1.3 KiB
Diff
From: Joe Thornber <ejt@redhat.com>
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Date: Thu, 27 Nov 2014 12:26:46 +0000
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Subject: [PATCH] dm cache: dirty flag was mistakenly being cleared when
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promoting via overwrite
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If the incoming bio is a WRITE and completely covers a block then we
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don't bother to do any copying for a promotion operation. Once this is
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done the cache block and origin block will be different, so we need to
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set it to 'dirty'.
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Signed-off-by: Joe Thornber <ejt@redhat.com>
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Signed-off-by: Mike Snitzer <snitzer@redhat.com>
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Cc: stable@vger.kernel.org
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---
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drivers/md/dm-cache-target.c | 10 +++++++---
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1 file changed, 7 insertions(+), 3 deletions(-)
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diff --git a/drivers/md/dm-cache-target.c b/drivers/md/dm-cache-target.c
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index 6f7086355691..387b93d81138 100644
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--- a/drivers/md/dm-cache-target.c
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+++ b/drivers/md/dm-cache-target.c
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@@ -951,10 +951,14 @@ static void migration_success_post_commit(struct dm_cache_migration *mg)
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}
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} else {
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- clear_dirty(cache, mg->new_oblock, mg->cblock);
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- if (mg->requeue_holder)
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+ if (mg->requeue_holder) {
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+ clear_dirty(cache, mg->new_oblock, mg->cblock);
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cell_defer(cache, mg->new_ocell, true);
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- else {
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+ } else {
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+ /*
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+ * The block was promoted via an overwrite, so it's dirty.
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+ */
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+ set_dirty(cache, mg->new_oblock, mg->cblock);
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bio_endio(mg->new_ocell->holder, 0);
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cell_defer(cache, mg->new_ocell, false);
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}
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--
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2.1.0
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