LU-18120 ldiskfs: improve a quota speedup patch

LU-18120 ldiskfs: improve a quota speedup patch

current patch might have a small window to make write duplicate,
lets avoid it.

HPe-bug-id: LUS-12432
Signed-off-by: Alexey Lyashkov <alexey.lyashkov@hpe.com>
Change-Id: I8de2e675d3bf5d5cbb41b25b04affe1d5e0d6411
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/55979
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andrew Perepechko <andrew.perepechko@hpe.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>