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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: ce12965 ("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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@ -426,6 +426,10 @@ struct btrfs_space_info {
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struct list_head ro_bgs;
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struct list_head priority_tickets;
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struct list_head tickets;
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/*
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* tickets_id just indicates the next ticket will be handled, so note
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* it's not stored per ticket.
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*/
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u64 tickets_id;
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struct rw_semaphore groups_sem;
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