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fscrypt: introduce fscrypt_needs_contents_encryption()
Add a function fscrypt_needs_contents_encryption() which takes an inode and returns true if it's an encrypted regular file and the kernel was built with fscrypt support. This will allow replacing duplicated checks of IS_ENCRYPTED() && S_ISREG() on the I/O paths in ext4 and f2fs, while also optimizing out unneeded code when !CONFIG_FS_ENCRYPTION. Link: https://lore.kernel.org/r/20191209205021.231767-1-ebiggers@kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com>
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