btrfs: qgroup: use qgroup_iterator to replace tmp ulist in qgroup_update_refcnt()

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For function qgroup_update_refcnt(), we use @tmp list to iterate all the
involved qgroups of a subvolume.

It's a perfect match for qgroup_iterator facility, as that @tmp ulist
has a very limited lifespan (just inside the while() loop).

By migrating to qgroup_iterator, we can get rid of the GFP_ATOMIC memory
allocation and no error handling is needed.

Reviewed-by: Boris Burkov <boris@bur.io>
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 2023-09-02 08:13:56 +08:00 • committed by David Sterba

parent a0bdc04b07

commit a4a81383fb

1 changed files with 11 additions and 28 deletions

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fs/btrfs/qgroup.c

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