btrfs: add necessary comments about tickets_id
Tickets_id's name may result in some misunderstandings, it just indicates the next ticket will be handled and is not stored per ticket. Fixes: ce129655 ("btrfs: introduce tickets_id to determine whether asynchronous metadata reclaim work makes progress") Signed-off-by: Wang Xiaoguang <wangxg.fnst@cn.fujitsu.com> Signed-off-by: David Sterba <dsterba@suse.com>
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