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dm writecache: correct uncommitted_block when discarding uncommitted entry

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commit 39495b12ef1cf602e6abd350dce2ef4199906531 upstream.

When uncommitted entry has been discarded, correct wc->uncommitted_block
for getting the exact number.

Fixes: 48debafe4f2fe ("dm: add writecache target")
Cc: stable@vger.kernel.org
Signed-off-by: Huaisheng Ye <yehs1@lenovo.com>
Acked-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Huaisheng Ye 2020-06-12 23:59:11 +08:00 committed by Sasha Levin
parent de1d70dad6
commit a51e71cbf6
1 changed files with 2 additions and 0 deletions
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2
drivers/md/dm-writecache.c
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@ -805,6 +805,8 @@ static void writecache_discard(struct dm_writecache *wc, sector_t start, sector_
writecache_wait_for_ios(wc, WRITE);
discarded_something = true;
}
if (!writecache_entry_is_committed(wc, e))
wc->uncommitted_blocks--;
writecache_free_entry(wc, e);
}