btrfs: extract inlined creation into a dedicated delalloc helper

Currently we call cow_file_range_inline() in different situations, from
regular cow_file_range() to compress_file_range().

This is because inline extent creation has different conditions based on
whether it's a compressed one or not.

But on the other hand, inline extent creation shouldn't be so
distributed, we can just have a dedicated branch in
btrfs_run_delalloc_range().

It will become more obvious for compressed inline cases, it makes no
sense to go through all the complex async extent mechanism just to
inline a single block.

So here we introduce a dedicated run_delalloc_inline() helper, and
remove all inline related handling from cow_file_range() and
compress_file_range().

There is a special update to inode_need_compress(), that a new
@check_inline parameter is introduced.
This is to allow inline specific checks to be done inside
run_delalloc_inline(), which allows single block compression, but
other call sites should always reject single block compression.

Reviewed-by: Boris Burkov <boris@bur.io>
Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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