dm-writecache: fix uncommitted_blocks underflow

Revert the commit 39495b12ef1cf602e6abd350dce2ef4199906531

writecache_bio_copy_ssd sets wc->uncommitted_blocks = 0; and then queues
the flush work: queue_work(wc->writeback_wq, &wc->flush_work);

It may be possible that discard is dispatched in this window, and the
discard would decrement wc->uncommitted_blocks to -1U.

Note that this bug is benign - wc->uncommitted_blocks is only used to
trigged autocommit, so decrementing it to -1U will trigger a spurious
autocommit, but won't cause any data corruption.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Assisted-by: Claude:claude-opus-5
Fixes: 39495b12ef1c ("dm writecache: correct uncommitted_block when discarding uncommitted entry")
Cc: stable@vger.kernel.org

0 files changed, 0 insertions, 0 deletions