[Devel] [PATCH VZ9 0/4] dm-ploop: truncate helpers cleanup and read-only table fix

[Vasileios Almpanis]

The series consists of four patches:

- Add a new do_ftruncate() helper that operates directly on a struct file, 
  allowing in-kernel callers to truncate files without going through file descriptor based interfaces.
- Export do_ftruncate() so it can be used by other kernel subsystems.
- Revert the recently introduced vfs_truncate2() helper, which becomes 
  redundant after exporting do_ftruncate() and adds unnecessary API surface.
- Fix dm-ploop target constructor logic to avoid preallocating clusters when the table 
  is created in read-only mode. Userspace may still pass the optional fallo_new_clu argument,
  but preallocation must be skipped for read-only ploop devices.

https://virtuozzo.atlassian.net/browse/VSTOR-123292
Signed-off-by: Vasileios Almpanis <vasileios.almpanis at virtuozzo.com>

Tony Solomonik (1):
  Add do_ftruncate that truncates a struct file

Vasileios Almpanis (3):
  fs: Export do_ftruncate
  Revert "fs: Introduce vfs_truncate2() with file argument"
  dm-ploop: dont preallocate clusters for read only table

 drivers/md/dm-ploop-map.c    |  2 +-
 drivers/md/dm-ploop-target.c |  2 +-
 drivers/md/dm-qcow2-map.c    |  2 +-
 fs/internal.h                |  1 +
 fs/open.c                    | 60 +++++++++++++++++++-----------------
 include/linux/fs.h           |  7 ++---
 kernel/trace/bpf_trace.c     |  3 +-
 7 files changed, 40 insertions(+), 37 deletions(-)

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2.43.0