On Thu, Jun 06, 2019 at 08:52:00AM -0700, Eric Biggers wrote:

From: Eric Biggers <redacted>

Add a function for filesystems to call to implement the
FS_IOC_MEASURE_VERITY ioctl.  This ioctl retrieves the file measurement
that fs-verity calculated for the given file and is enforcing for reads;
i.e., reads that don't match this hash will fail.  This ioctl can be
used for authentication or logging of file measurements in userspace.

See the "FS_IOC_MEASURE_VERITY" section of
Documentation/filesystems/fsverity.rst for the documentation.

Signed-off-by: Eric Biggers <redacted>

Looks good; you can add:

Reviewed-off-by: Theodore Ts'o [off-list ref]

						- Ted