btrfs: reloc: add backref_cache::pending_edge and backref_cache::useless_node

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These two new members will act the same as the existing local lists,
@useless and @list in build_backref_tree().

Currently build_backref_tree() is only executed serially, thus moving
such local list into backref_cache is still safe.

Also since we're here, use list_first_entry() to replace a lot of
list_entry() calls after !list_empty().

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Qu Wenruo 2020-03-05 13:48:31 +08:00 • committed by David Sterba

parent 9569cc203d

commit 8478028933

1 changed files with 46 additions and 28 deletions

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fs/btrfs/relocation.c

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