[PATCH nfs-utils v2 0/4] exports: add support for new read_io= and write_io= export options

[Jeff Layton <jlayton@kernel.org>]

This is the companion patch series to [1]. Chuck suggested we change the
export options to read_io= and write_io=. That's the only real change
in this version.

The last patch in this adds a new nfsd-iomode-advisor script that
watches various stats on the server and advises the admin what mode to
use.

I consider the advisor optional as it was largely vibe-coded. I'm not
sure I'd trust its advice that far, but it's probably better than
guessing. I did test it on a range of different machine types and it
seemed to do the right thing.

[1]: https://lore.kernel.org/linux-nfs/20261029-export-iomode-v2-6-fe8ec6251a36@kernel.org/

Signed-off-by: Jeff Layton <jlayton@kernel.org>
---
Changes in v2:
- Rename riomode=/wiomode= to read_io=/write_io= to match the kernel series.
- Link to v1: https://lore.kernel.org/r/20261027-master-v1-0-6f1f7a35a83b@kernel.org

---
Jeff Layton (4):
      exportfs/mountd/exportd: track the svc_export policy highest attribute
      exports: Add read_io= and write_io= export options
      exportfs: Display and document read_io= and write_io=
      nfsd-iomode-advisor: recommend read_io= and write_io= for an export

 configure.ac                                      |    3 +-
 support/export/cache.c                            |   59 +-
 support/export/export_policy.c                    |   29 +-
 support/export/v4root.c                           |    2 +
 support/include/exportfs.h                        |    3 +
 support/include/nfsd_netlink.h                    |   12 +
 support/include/nfslib.h                          |   14 +
 support/nfs/exports.c                             |   51 +
 tools/Makefile.am                                 |    2 +-
 tools/nfsd-iomode-advisor/Makefile.am             |   14 +
 tools/nfsd-iomode-advisor/nfsd-iomode-advisor.man |  232 ++++
 tools/nfsd-iomode-advisor/nfsd-iomode-advisor.py  | 1198 +++++++++++++++++++++
 utils/exportfs/exportfs.c                         |   34 +
 utils/exportfs/exports.man                        |   22 +
 14 files changed, 1671 insertions(+), 4 deletions(-)
---
base-commit: 0ed4324cbbb8020039d338d597c1422a980f7085
change-id: 20261014-master-b5afd69e3772

Best regards,
-- 
Jeff Layton <jlayton@kernel.org>