[PATCH v5 0/9] xfs: pNFS block layout fixes

[Daejun Park via B4 Relay]

The XFS side of the pNFS block and SCSI layout fixes. A pNFS client
alone can trigger the bugs fixed by patches 1 and 3 to 6. Patch 7
closes a race with a local process writing to a shared mapping.
Patches 8 and 9 make a LAYOUTCOMMIT stable the way fdatasync does.

Patch 3 needs patch 2. Patch 4 should not go without patches 2 and 3,
and patch 6 not without patch 5. Patches 1 to 6 are marked for stable.
XFS_BMAPI_CONVERT_ONLY takes bit 12 of the bmapi flags, which the
fs-verity series [1] also uses.

Tested on nfsd-testing plus this series in QEMU guests. nfsd exported
XFS on an nvmet-tcp namespace to pynfs ([2] and local tests for patches
5 and 6) and the Linux client, with KASAN and lockdep and also with
XFS_DEBUG. fstests -g quick ran on a local XFS. Each patch builds with
W=1 on for-next.

[1] https://lore.kernel.org/r/20261002223705.2175542-14-aalbersh@xxxxxxxxxx
[2] https://lore.kernel.org/r/20261014-pynfs-block-commit-v1-0-1723979f495f@xxxxxxxxxxx

---
Changes in v5:
- Cap the block count in xfs_iomap_write_direct() instead of
  xfs_fs_map_blocks().
- Clamp the layout length with min_t(), as min() rejects u64 against
  loff_t.
- Assert that XFS_BMAPI_CONVERT_ONLY allocated nothing.
- Shorter commit messages, with test results below the --- line.

Changes in v4:
- Limit a pNFS allocation to XFS_MAX_BMBT_EXTLEN blocks instead of
  refusing a count whose reservation would wrap.

Changes in v3:
- Post the XFS pNFS patches as one series.
- Split XFS_BMAPI_CONVERT_ONLY from its pNFS user.
- Return -ENOSR when nothing is mapped, and commit the transaction
  instead of cancelling it.
- Add the datasync arguments to xfs_log_force_inode() itself.

---
Daejun Park (9):
      xfs: mark the inode preallocated for pNFS write layouts past EOF
      xfs: add a flag to convert unwritten extents without allocating blocks
      xfs: refuse a pNFS LAYOUTCOMMIT of a range without blocks
      xfs: clamp a pNFS LAYOUTCOMMIT extent before computing its end
      xfs: cap the block count of xfs_iomap_write_direct() at one extent
      xfs: clamp the pNFS layout range to the maximum file size
      xfs: take the invalidate lock while mapping a pNFS layout
      xfs: add datasync and log_flushed arguments to xfs_log_force_inode()
      xfs: make pNFS LAYOUTCOMMIT stable the way fdatasync does

 fs/xfs/libxfs/xfs_bmap.c | 14 +++++++--
 fs/xfs/libxfs/xfs_bmap.h | 10 +++++-
 fs/xfs/xfs_export.c      |  2 +-
 fs/xfs/xfs_file.c        | 52 +++---------------------------
 fs/xfs/xfs_inode.c       | 36 ++++++++++++++++++---
 fs/xfs/xfs_inode.h       |  3 +-
 fs/xfs/xfs_ioend.c       |  2 +-
 fs/xfs/xfs_iomap.c       | 28 +++++++++++++++--
 fs/xfs/xfs_iomap.h       |  3 +-
 fs/xfs/xfs_pnfs.c        | 82 +++++++++++++++++++++++++++++++++---------------
 fs/xfs/xfs_zone_gc.c     |  2 +-
 11 files changed, 147 insertions(+), 87 deletions(-)
---
base-commit: ec8f62cc109a3f596b3c65dc0f1011c209239051
change-id: 20261015-xfs-pnfs-batch-85459210aeeb

Best regards,
-- 
Daejun Park <daejun7.park@xxxxxxxxxxx>