Direct IO is very inflexible. A better way is this recommended by Linus in an old post: https://lkml.iu.edu/hypermail/linux/kernel/1005.2/01845.html https://l

Direct IO is very inflexible. A better way is this recommended by Linus in an old post: https://lkml.iu.edu/hypermail/linux/kernel/1005.2/01845.html https://lkml.iu.edu/hypermail/linux/kernel/1005.2/01845.html I implemented something along the same lines but a bit less spicy here: https://gitlab.com/nbdkit/nbdkit/-/commit/aa5a2183a6d16afd919174b5ba8222b2bccf4039 https://gitlab.com/nbdkit/nbdkit/-/commit/aa5a2183a6d16afd91...