ntfs: reuse compression output workspace across write units

ntfs_write_cb() allocates output pages and creates input and output
vmaps for every compression unit. Sequential writes repeatedly pay
those allocation and page-table costs even though each unit has the
same maximum output size.
Allocate and map the output workspace once per write request. Access

input sub-blocks with kmap_local_page(), and reuse the output pages and
mapping for every compression unit in the request.

Reviewed-by: Hyunchul Lee <hyc.lee@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

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