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The documentation for add_new_free_space() is stale and no longer correct:
1) It's no longer used only when caching a block group. It's also called
when creating a block group (btrfs_make_block_group()), when reading
a block group at mount time (read_one_block_group()) and when reading
the free space tree for a block group (typically the first time we
attempt to allocate from the block group);
2) It has nothing to do with pinned extents. It only deals with the
excluded extents io tree, which is used to track the locations of
super blocks in order to make sure we never add the location of a
super block to the free space cache of a block group.
So update the documention and also add a description of the arguments
and return values.
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
28f6089490