On Mon, Nov 27, 2023 at 05:08:22PM +0000, Trond Myklebust wrote: > Note that APPEND would only really work with O_DIRECT, since it is > anathema to cached I/O to not be able to control the placement of the > data. Yes. > In addition, the model will always break down if someone decides they > want to write a log entry of size > wsize. Once you have to split up > the data, you (obviously) lose the atomicity you need in order to write > a contiguous record. Yes. Note that there is work going on to define atomic I/O limits on the various Linux lists currently. Although in the block layer we also have a separate limit for the maximum append size already.
