btrfs: pass the new logical address to split_extent_map
split_extent_map splits off the first chunk of an extent map into a new one. One of the two users is the zoned I/O completion code that wants to rewrite the logical block start address right after this split. Pass in the logical address to be set in the split off first extent_map as an argument to avoid an extra extent tree lookup for this case. Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David Sterba <dsterba@suse.com>
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