[PATCH 0/4] pNFS: Fix layoutcommit handling in block/scsi driver

[Sergey Bashirov <sergeybashirov@gmail.com>]

Depending on the allocation scheme and size, some files may have a large
number of extents. This series fixes the handling of large extent arrays
and allows the pNFS client to split large layoutcommits that exceed the
maximum RPC size accepted by the server into multiple requests.

Manually tested for the block layout driver:
sudo mount.nfs4 -v -o minorversion=2,sync,hard,noatime,  \
                      rsize=16384,wsize=16384,timeo=600, \
                      retrans=2 192.168.1.1:/mnt/export /mnt/pnfs
sudo fio --name=test --filename=/mnt/pnfs/test6.raw --size=10M \
         --rw=randwrite --ioengine=libaio --direct=1 --bs=4k   \
         --iodepth=128 --fallocate=none --verify=sha1
Trace:
    fio-1580  [012]  1258.595866: bl_ext_tree_prepare_commit:
        ret=-28, found 372 ranges, lwb=1531903, not all ranges encoded
    fio-1580  [012]  1258.609534: bl_ext_tree_prepare_commit:
        ret=-28, found 372 ranges, lwb=3104767, not all ranges encoded
    fio-1580  [012]  1258.655556: bl_ext_tree_prepare_commit:
        ret=-28, found 372 ranges, lwb=4644863, not all ranges encoded
    fio-1580  [012]  1258.699603: bl_ext_tree_prepare_commit:
        ret=-28, found 372 ranges, lwb=6176767, not all ranges encoded
    fio-1580  [012]  1258.743650: bl_ext_tree_prepare_commit:
        ret=-28, found 372 ranges, lwb=7708671, not all ranges encoded
    fio-1580  [012]  1258.787605: bl_ext_tree_prepare_commit:
        ret=-28, found 372 ranges, lwb=9236479, not all ranges encoded
    fio-1580  [012]  1258.817439: bl_ext_tree_prepare_commit:
        ret=0, found 295 ranges, lwb=10485759

Signed-off-by: Sergey Bashirov <sergeybashirov@gmail.com>
---
Sergey Bashirov (4):
  pNFS: Fix uninited ptr deref in block/scsi layout
  pNFS: Fix extent encoding in block/scsi layout
  pNFS: Add prepare commit trace to block/scsi layout
  pNFS: Handle RPC size limit for layoutcommits

 fs/nfs/blocklayout/extent_tree.c | 104 +++++++++++++++++++++++++++----
 fs/nfs/nfs4trace.c               |   1 +
 fs/nfs/nfs4trace.h               |  34 ++++++++++
 fs/nfs/pnfs.c                    |  11 +++-
 4 files changed, 134 insertions(+), 16 deletions(-)

-- 
2.43.0