smb/server: fix posix state check for directory rename

Pass the source ksmbd_file to the rename helpers and use the per-handle
POSIX create-context state when deciding whether open children block a
directory rename.

work->tcon->posix_extensions only records whether POSIX extensions were
negotiated on the connection.  It does not indicate that the handles were
opened with POSIX create contexts.

Reproducer:

  1. server: systemctl start ksmbd
  2. client: mount -t cifs //${server_ip}/export /mnt
     # without posix option
  3. client: mkdir /mnt/dir1/; touch /mnt/dir1/file
  4. client: tail -f /mnt/dir1/file # open file
  5. client: mv /mnt/dir1 /mnt/dir2

Without this fix, the rename can succeed when it should fail with
"Permission denied".

Fixes: c841bd3d8dec ("ksmbd: deny renaming directory with open children")
Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>

0 files changed, 0 insertions, 0 deletions