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Use the new name for fscrypt constants and structures which have been
given a new name.
Also use the named constant for the DIRECT_KEY fscrypt policy flag.
No change in behavior. This is just preparing for future work.
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As new encryption modes are being added to the kernel that use 128 bit
keys (see https://patchwork.kernel.org/patch/9741913), we will need the
encryption modes to be more descriptive.
This change breaks backwards compatibility for the protobuf, but that's
fine because we have not released yet.
Change-Id: Ifb58d3d5a42db491f1e5393c12f3d260d9a091de
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This commit adds in IsValid() checks for the metadata structures that
let us enforce stronger invariants than those imposed by the protobuf
package. The main uses of this will be to check that metadata is valid
before writing it to the filesystem, and to check that the filesystem
contains valid metadata before returning it to the user. These functions
also will log the exact reason if the validity checks fail.
To have these checks in the metadata package, all of the various
constants have been moved to a single metadata/constants.go file. The
uses of these constants were changed accordingly.
Finally, this commit standardizes our use of errors so that they always
begin with an appropriate prefix.
Change-Id: I99008e2ee803ebe5f6236eb8d83fc83efcd22718
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