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    From
    SubjectRe: partially encrypted filesystem
    Date
    Followup to:  <3FCE8CF5.4030006@pobox.com>
    By author: Jeff Garzik <jgarzik@pobox.com>
    In newsgroup: linux.dev.kernel
    >
    > Linus Torvalds wrote:
    > > With an encrypted filesystem, you can't do that. Or rather: you can do it
    > > if the filesystem is read-only, but you definitely CANNOT do it on
    > > writing. For writing you have to marshall the output buffer somewhere
    > > else (and quite frankly, it tends to become a lot easier if you can do
    > > that for reading too).
    > >
    > > And that in turn causes problems. You get all kinds of interesting
    > > deadlock schenarios when write-out requires more memory in order to
    > > succeed. So you need to get careful. Reading ends up being the much easier
    > > case (doesn't have the same deadlock issues _and_ you could do it in-place
    > > anyway).
    >
    >
    > FWIW zisofs and ntfs have to do this too, since X on-disk compressed
    > pages must be expanded to X+Y in-memory pages...
    >

    zisofs is read-only, so it doesn't apply.

    -hpa
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