btrfs: reloc: use wrapper to replace open-coded edge linking

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Since backref_edge is used to connect upper and lower backref nodes, and
needs to access both nodes, some code can look pretty nasty:

		list_add_tail(&edge->list[LOWER], &cur->upper);

The above code will link @cur to the LOWER side of the edge, while both
"LOWER" and "upper" words show up.  This can sometimes be very confusing
for reader to grasp.

This patch introduces a new wrapper, link_backref_edge(), to handle the
linking behavior.  Which also has extra ASSERT() to ensure caller won't
pass wrong nodes.

Also, this updates the comment of related lists of backref_node and
backref_edge, to make it more clear that each list points to what.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Nikolay Borisov <nborisov@suse.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 2020-02-24 09:19:02 +08:00 • committed by David Sterba

parent 4d81ea8bb4

commit 2a979612d5

1 changed files with 37 additions and 16 deletions

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fs/btrfs/relocation.c

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