f2fs: use mnt_{want,drop}_write_file in ioctl
In interfaces of ioctl, mnt_{want,drop}_write_file should be used for: - get exclusion against file system freezing which may used by lvm snapshot. - do telling filesystem that a write is about to be performed on it, and make sure that the writes are permitted. Signed-off-by: NChao Yu <yuchao0@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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