f2fs: allow write page cache when writting cp
This patch allow write data to normal file when writting new checkpoint. We relax three limitations for write_begin path: 1. data allocation 2. node allocation 3. variables in checkpoint Signed-off-by: NYunlei He <heyunlei@huawei.com> Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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