f2fs: sanity check size of nat and sit cache
Make sure number of entires doesn't exceed max journal size. Cc: stable@vger.kernel.org Signed-off-by: Jin Qian <jinqian@android.com> Reviewed-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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