[PATCH v2 0/4] Enable holes in copy_file_range()

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If copy_file_range performs a copy using splice, it converts holes
to zeros. This effort primarily changes this behavior to create
holes when it is possible. 

Even if copy_file_range() or clone_file_range() does not work for different
mounted filesystems, We should be able to splice files if they do not
belong the same super_block.

Changes since v1:
- Fixed bug when hole/data offset is farther than len
- [Amir] Refactor flags parameter

Changes since v0:
- [Amir] Carved out do_copy_file_range() which can be used by overlayfs

-- 
Goldwyn




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