  > Doing atomic writes is extremely fragile if you are just on top of the filesystem.

This is not true, at least in Linux.

  pwritev2(fd, iov, iovcnt, offset, RWF_ATOMIC);

The requirements being that the write must be block-aligned and no larger than the underlying FS's guaranteed atomic write size

▲ tclancy 5 hours ago | parent [-]

Sure, but how many people using files as a data store even know to worry about atomicity?

	▲	sgarland 5 hours ago \| parent [-]
		They will learn eventually, and then they’ll get to write a blogpost describing something that any sysadmin or kernel dev could’ve told them. Win-win!