On Wed, Aug 28, 2019 at 12:32:29PM +0200, Martijn Coenen wrote: > The loop driver assumes that if the passed in fd is opened with > O_DIRECT, the caller wants to use direct I/O on the loop device. > However, if the underlying filesystem has a different block size than > the loop block queue, direct I/O can't be enabled. Instead of requiring > userspace to manually change the blocksize and re-enable direct I/O, > just change the queue block size to match. Why can't we enable the block device in that case? All the usual block filesystems support 512 byte aligned direct I/O with a 4k file system block size (as long as the underlying block device sector size is also 512 bytes).
