Re: allow file systems to increase the minimum writeback chunk size v2

Andrew Morton
2025-10-22T18:38:26Z

On Wed, 22 Oct 2025 07:34:34 +0200 Christoph Hellwig <hch@lst.de> wrote:

> Looks like everything is reviewed now, can we get this queued up
> as it fixes nasty fragmentation for zoned XFS?
>
> It seems like the most recent writeback updates went through the VFS
> tree, although -mm has been quite common as well.

mpage, writeback, readahead, filemap, buffer.c etc have traditionally
been MM tree things (heck, I basically wrote them all a mere 20 years
ago).

They're transitioning to being fs things nowadays, and that makes sense
- filesystems are the clients for this code.

But please do keep cc'ing linux-mm and myself on this work.

> > fs/fs-writeback.c | 26 +++++++++-----------------
> > fs/super.c | 1 +
> > fs/xfs/xfs_zone_alloc.c | 28 ++++++++++++++++++++++++++--
> > include/linux/fs.h | 1 +
> > include/linux/writeback.h | 5 +++++

VFS tree, please.