btrfs: clean up cow_file_range_inline()
The start parameter to cow_file_range_inline() (and insert_inline_extent()) is always 0, so get rid of it and simplify the logic in those two functions. Pass btrfs_inode to insert_inline_extent() and remove the redundant root parameter. Also document the requirements for creating an inline extent. No functional change. Signed-off-by: NOmar Sandoval <osandov@fb.com> Reviewed-by: NDavid Sterba <dsterba@suse.com> Signed-off-by: NDavid Sterba <dsterba@suse.com>
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