[PATCH v5 0/4] smb/client: fix fallocate and allocation accounting

[Huiwen He <huiwen.he@linux.dev>]

From: Huiwen He <hehuiwen@kylinos.cn>

Changes in v5:

- Update patch 1 commit message to mention the generic/370 regression fix.
- Update patch 3 commit message to clarify the small EOF-extending mode 0
  fallocate case.
- Rework patch 4 to refresh AllocationSize after SetEOF instead of failing
  when AllocationSize does not grow, preserving compatibility with Samba
  "strict allocate = no" for requests such as "falloc 0 5M". This makes
  generic/496 and generic/701 pass on ksmbd.

- Drop the overlapping allocated ranges patch. It was a Sashiko review
  cleanup suggestion, not a fix for a reproducible Samba or ksmbd failure.

The following patches from v4 are dropped in v5:
  - smb/client: handle smb2_set_sparse() failure in EOF-extending fallocate
  - smb/client: handle smb2_set_sparse() failure in non-extending fallocate
  - smb/client: handle overlapping allocated ranges in fallocate

The following patches are already in upstream and are not resent:
  - smb/client: name the default fallocate mode
  - smb/client: preserve errors from smb2_set_sparse()
  - smb/client: do not account EOF extension as allocation

Link to v4:
https://lore.kernel.org/linux-cifs/20260626134719.158270-1-huiwen.he@linux.dev

Thanks,
Huiwen

Huiwen He (4):
  smb/client: refresh allocation size after duplicate extents
  smb/client: reduce fallocate zero buffer allocation
  smb/client: emulate small EOF-extending mode 0 fallocate ranges
  smb/client: refresh allocation after EOF-extending fallocate

 fs/smb/client/smb2ops.c   | 128 +++++++++++++++++++++++++++++++++++---
 fs/smb/client/smb2pdu.c   |  19 ++++++
 fs/smb/client/smb2proto.h |   3 +
 fs/smb/common/fscc.h      |   5 ++
 fs/smb/server/smb2pdu.h   |   4 --
 5 files changed, 146 insertions(+), 13 deletions(-)

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2.43.0