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https://git.kernel.dk/cgit/fio/tree/t/io_uring.c

Not necessarily, while reflink works only within the boundaries of the same filesystem there are other optimizations that can operate across filesystems (even networked ones). For …

The fastest `cp` is actually doing no data copies at all (relying on copy-on-write), on filesystems with reflink support. Incidentally, coreutils v9.0 cp switched to doing reflinks…

Your first point is the correct one. Basically the offset passed to bdev_write_page() was wrong, and has been like that since it was introduced to swap code back in v3.16. In pract…