Btrfs: fix misuse of trans block rsv
At the beginning of create_pending_snapshot, trans->block_rsv is set to pending->block_rsv and is used for snapshot things, however, when it is done, we do not recover it as will. Signed-off-by: NLiu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: NChris Mason <chris.mason@oracle.com>
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