btrfs: add necessary comments about tickets_id
authorWang Xiaoguang <wangxg.fnst@cn.fujitsu.com>
Mon, 7 Nov 2016 07:59:16 +0000 (15:59 +0800)
committerDavid Sterba <dsterba@suse.com>
Wed, 30 Nov 2016 12:45:14 +0000 (13:45 +0100)
commit939659dfd3ed4ff36dde532782207cfb0e5fbcf6
tree402a2e85e4e0f75657b8a156d51c3ab6172636cb
parentdc1a90c6aad8f0a4bd6e5e02c5244c6a760cd776
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>
fs/btrfs/ctree.h