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btrfs-progs: remove comments about delayed ref in backref.c

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There is no delayed ref in btrfs-progs, so remove related comments.

Signed-off-by: Su Yue <suy.fnst@cn.fujitsu.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Su Yue 2018-04-24 13:52:31 +08:00 committed by David Sterba
parent 8606fe4bcb
commit 6a42806d74
1 changed files with 3 additions and 16 deletions
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19
backref.c
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@ -155,19 +155,6 @@ static void init_pref_state(struct pref_state *prefstate)
* - if you cannot add the parent or a correct key, then we will look into the
* block later to set a correct key
*
* delayed refs
* ============
* backref type | shared | indirect | shared | indirect
* information | tree | tree | data | data
* --------------------+--------+----------+--------+----------
* parent logical | y | - | - | -
* key to resolve | - | y | y | y
* tree block logical | - | - | - | -
* root for resolving | y | y | y | y
*
* - column 1: we've the parent -> done
* - column 2, 3, 4: we use the key to find the parent
*
* on disk refs (inline or keyed)
* ==============================
* backref type | shared | indirect | shared | indirect
@ -735,9 +722,9 @@ static int __add_keyed_refs(struct btrfs_fs_info *fs_info,
}
/*
* this adds all existing backrefs (inline backrefs, backrefs and delayed
* refs) for the given bytenr to the refs list, merges duplicates and resolves
* indirect refs to their parent bytenr.
* this adds all existing backrefs (inline backrefs, backrefs for the given
* bytenr to the refs list, merges duplicates and resolves indirect refs to
* their parent bytenr.
* When roots are found, they're added to the roots list
*
* FIXME some caching might speed things up