mainline inclusion
from mainline-5.2-rc1
commit 22f96b38
category: feature
bugzilla: https://bugzilla.openeuler.org/show_bug.cgi?id=27
CVE: NA
---------------------------

This just pulls out the ksys_sync_file_range() code to work on a struct
file instead of an fd, so we can use it elsewhere.
Signed-off-by: NJens Axboe <axboe@kernel.dk>

Conflicts:
	fs/sync.c
	include/linux/fs.h
	[ Patch c553ea4f("fs/sync.c: sync_file_range(2) may use
	  WB_SYNC_ALL writeback") applied earlier. ]
Signed-off-by: NZhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Nyangerkun <yangerkun@huawei.com>
Reviewed-by: Nzhangyi (F) <yi.zhang@huawei.com>
Signed-off-by: NCheng Jian <cj.chengjian@huawei.com>