On Thu, Jun 20, 2019 at 11:16:58AM -0700, Eric Biggers wrote: > From: Eric Biggers <ebiggers@xxxxxxxxxx> > > Document how to test ext4, f2fs, and ubifs encryption with xfstests. > > Signed-off-by: Eric Biggers <ebiggers@xxxxxxxxxx> > --- > Documentation/filesystems/fscrypt.rst | 39 +++++++++++++++++++++++++++ > 1 file changed, 39 insertions(+) > > diff --git a/Documentation/filesystems/fscrypt.rst b/Documentation/filesystems/fscrypt.rst > index 87d4e266ffc86d..82efa41b0e6c02 100644 > --- a/Documentation/filesystems/fscrypt.rst > +++ b/Documentation/filesystems/fscrypt.rst > @@ -649,3 +649,42 @@ Note that the precise way that filenames are presented to userspace > without the key is subject to change in the future. It is only meant > as a way to temporarily present valid filenames so that commands like > ``rm -r`` work as expected on encrypted directories. > + > +Tests > +===== > + > +To test fscrypt, use xfstests, which is Linux's de facto standard > +filesystem test suite. First, run all the tests in the "encrypt" > +group on the relevant filesystem(s). For example, to test ext4 and > +f2fs encryption using `kvm-xfstests > +<https://github.com/tytso/xfstests-bld/blob/master/Documentation/kvm-quickstart.md>`_:: > + > + kvm-xfstests -c ext4,f2fs -g encrypt > + > +UBIFS encryption can also be tested this way, but it should be done in > +a separate command, and it takes some time for kvm-xfstests to set up > +emulated UBI volumes:: > + > + kvm-xfstests -c ubifs -g encrypt > + > +No tests should fail. However, tests that use non-default encryption > +modes (e.g. generic/549 and generic/550) will be skipped if the needed > +algorithms were not built into the kernel's crypto API. Also, tests > +that access the raw block device (e.g. generic/399, generic/548, > +generic/549, generic/550) will be skipped on UBIFS. > + > +Besides running the "encrypt" group tests, for ext4 and f2fs it's also > +possible to run most xfstests with the "test_dummy_encryption" mount > +option. This option causes all new files to be automatically > +encrypted with a dummy key, without having to make any API calls. > +This tests the encrypted I/O paths more thoroughly. To do this with > +kvm-xfstests, use the "encrypt" filesystem configuration:: > + > + kvm-xfstests -c ext4/encrypt,f2fs/encrypt -g auto > + > +Because this runs many more tests than "-g encrypt" does, it takes > +much longer to run; so also consider using `gce-xfstests > +<https://github.com/tytso/xfstests-bld/blob/master/Documentation/gce-xfstests.md>`_ > +instead of kvm-xfstests:: > + > + gce-xfstests -c ext4/encrypt,f2fs/encrypt -g auto > -- > 2.22.0.410.gd8fdbe21b5-goog > Applied to fscrypt.git for v5.3. - Eric
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