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tune2fsdoesn't allow flag removal; guess it could be simply due to confusion, since forcefully removing the flag does not actually stop the encryption at all.mke2fsandtune2fshave code to set additional flags (encryption algorithm) in the superblock when enabling the feature;debugfsdoes not and simply ignores the clear flag restrictions. So there is no deliberate implementation of this feature indebugfsand enabling the flag with it doesn't do the same thing asmke2fs/tune2fseither.fsckmakes that command look really risky. And I assume that command simply disables encryption/decryption processing by removing a flag, but encryption-related metadata (nonces, etc.) are still kept on the filesystem?fsckclears any encrypted data if the flag is disabled, although I don’t see anything like that in the source code so I suspect it doesn’t.)