f2fs: add roll-forward recovery process for encrypted dentry
Add roll-forward recovery process for encrypted dentry, so the first fsync issued to an encrypted file does not need writing checkpoint. This improves the performance of the following test at thousands of small files: open -> write -> fsync -> close Signed-off-by: NShuoran Liu <liushuoran@huawei.com> Acked-by: NChao Yu <yuchao0@huawei.com> [Jaegeuk Kim: modify kernel message to show encrypted names] Signed-off-by: NJaegeuk Kim <jaegeuk@kernel.org>
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