common/encrypt: allow the use of 'fscrypt:' as key prefix

fscrypt keys have used the $FSTYP as prefix.  However this format is being
deprecated -- newer kernels already allow the usage of the generic
'fscrypt:' prefix for ext4 and f2fs.  This patch allows the usage of this
new prefix for testing filesystems that have never supported the old
format, but keeping the $FSTYP prefix for filesystems that support it, so
that old kernels can be tested.

Signed-off-by: Luís Henriques <>
Signed-off-by: Jeff Layton <>
1 file changed