f2fs: don't cache nat entry if out of memory
If we run out of memory, in cache_nat_entry, it's better to avoid loop for allocating memory to cache nat entry, so in low memory scenario, for read path of node block, I expect this can avoid unneeded latency. Signed-off-by: Chao Yu <yuchao0@huawei.com> Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
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