fscrypt: Add in-place encryption mode
ext4 and f2fs require a bounce page when encrypting pages. However, not all filesystems will need that (eg. UBIFS). This is handled via a flag on fscrypt_operations where a fs implementation can select in-place encryption over using a bounce page (which is the default). Signed-off-by:David Gstir <david@sigma-star.at> Signed-off-by:
Richard Weinberger <richard@nod.at> Signed-off-by:
Theodore Ts'o <tytso@mit.edu>
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