On 6/20/24 9:20 AM, Christoph Hellwig wrote: > On Thu, Jun 20, 2024 at 04:15:23PM +0100, Matthew Wilcox wrote: >>> >>> and have O_DIRECT with a 32-bit memory alignment work just fine, where >>> before it would EINVAL. The sector size memory alignment thing has >>> always been odd and never rooted in anything other than "oh let's just >>> require the whole combination of size/disk offset/alignment to be sector >>> based". >> >> Oh, cool! https://man7.org/linux/man-pages/man2/open.2.html >> doesn't know about this yet; is anyone working on updating it? > > Just remember that there are two kinds of alignments: > > - the memory alignment, which Jens is talking about > - the offset/size alignment, which is set by the LBA size
Right, that's why I made the distinction above in terms of size, disk offset, and alignment - with the latter being what we're talking about, the memory alignment. -- Jens Axboe
