[PATCH v2 0/3] smb: client: fix i_blocks accounting for swapfile xfstests

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

From: Huiwen He <hehuiwen@kylinos.cn>

This series fixes CIFS swapfile xfstests failures caused by incorrect local
i_blocks accounting while cached inode attributes can be used.

The patches cover three cases:

  1. Update i_blocks after contiguous writes, so fully written swapfiles do
     not look sparse.

  2. Do not grow i_blocks on EOF extension, since extending EOF does not
     prove that the range was allocated.

  3. After EOF-extending fallocate, refresh i_blocks from the
     server-reported AllocationSize.

In my setup, the write-created swapfile tests pass with the cifsacl mount
option:

        generic/472 generic/494 generic/497
        generic/569 generic/636 generic/643

generic/496 also passes with this series when the server really allocates the
fallocated range, for example with Samba:

        [scratch_share]
        strict allocate = yes

generic/495 depends on the server-reported allocation unit matching the page
size.  In my Samba setup this requires:

        [global]
        block size = 4096

---
Changes since v1:
- Patch 1 was updated to cover more CIFS write paths and to use common
  helpers for local i_blocks accounting.
- Patches 2 and 3 are unchanged.

Link to v1:
https://lore.kernel.org/linux-cifs/20260604150349.101716-1-huiwen.he@linux.dev/
---

Thanks,
Huiwen He

Huiwen He (3):
  smb/client: update i_blocks after contiguous writes
  smb/client: do not account EOF extension as allocation
  smb/client: refresh allocation size after fallocate

 fs/smb/client/cifsfs.c   |  4 ++--
 fs/smb/client/cifsfs.h   |  1 +
 fs/smb/client/cifsglob.h |  9 ++++---
 fs/smb/client/file.c     | 52 ++++++++++++++++++++++++++++++++++++++++
 fs/smb/client/inode.c    | 13 +++++++---
 fs/smb/client/smb2ops.c  | 15 ++++++++++++
 6 files changed, 86 insertions(+), 8 deletions(-)

-- 
2.43.0