Re: removing the remaining blockdev_direct_IO users

On Fri, Jul 10, 2026 at 09:51:09AM -0700, Viacheslav Dubeyko wrote:
> On Fri, 2026-07-10 at 07:07 +0200, Christoph Hellwig wrote:
> > Hi all,
> > 
> > we have 7 users of blockdev_direct_IO and one of the lower-level
> > __blockdev_direct_IO left, and I'd really like to get rid of them.
> > 
> > The filesystems are affs, fat, hfs, hfsplus, jfs, nilfs2, udf and
> > ocfs2,
> > and you are the relevant maintainers.  In 7.2 exfat converted
> > entirely
> > to iomap, which would be a really good example for a "simple" file
> > system.  Another options especially for the file systems supporting
> > foreign formats would be to just drop direct I/O support and reduce
> > the support burden.
> 
> I like the idea. I think we can try to switch HFS/HFS+ and NILFS2 on
> iomap approach. Do you have some initial patches for this? Which
> particular commit(s) converted the exfat to iomap? It will be good to
> take a deeper look into this conversion to estimate the complexity of
> HFS/HFS+, NILFS2 modifications.

Almost all commits in fs/exfat/ in 7.2-rc1, starting with
623f0aa1eca5c2a94ca1e4e5de719d062eac3b6c