alt Hacker NewsI would assume cp uses ioctl (with atomic copies of individual files on filesystems that support CoW like APFS and BTRFS), whereas sqlite probably uses mmap?
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lmz • 05/02/2025
So not a "naive" cp, but at least it calls a shared ioctl that is implemented buy multiple filesystems.
I was trying to find evidence that reflink copies are atomic and could not and LLMs seem to think they are not. So at best may be a btrfs only feature?