On Tue, Nov 01, 2022 at 03:00:30PM -0400, Stefan Hajnoczi wrote: > Linux dm-crypt returns errno EIO from unaligned O_DIRECT pread(2) calls.
Citation needed. For direct I/O to block devices, the kernel's block layer checks the alignment before the I/O is actually submitted to the underlying block device. See https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/block/fops.c?h=v6.1-rc3#n306 > Buglink: https://gitlab.com/qemu-project/qemu/-/issues/1290 That "bug" seems to be based on a misunderstanding of the kernel source code, and not any actual testing. I just tested it, and the error code is EINVAL. - Eric
