tune2fs: prevent enabling encryption flag on encoding-aware fs

The kernel will refuse to mount filesystems with the encryption and
encoding features enabled at the same time.  The encoding feature can
only be set at mke2fs time, so we can just prevent encryption from being
set at a later time by tune2fs.

Signed-off-by: Gabriel Krisman Bertazi <krisman@collabora.co.uk>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/misc/tune2fs.c b/misc/tune2fs.c
index cd4057c..fbdf78a 100644 (file)
--- a/misc/tune2fs.c
+++ b/misc/tune2fs.c
@@ -1401,6 +1401,12 @@ mmp_error:
        }
 
        if (FEATURE_ON(E2P_FEATURE_INCOMPAT, EXT4_FEATURE_INCOMPAT_ENCRYPT)) {
+               if (ext2fs_has_feature_fname_encoding(sb)) {
+                       fputs(_("Cannot enable encrypt feature on filesystems "
+                               "with the encoding feature enabled.\n"),
+                             stderr);
+                       return 1;
+               }
                fs->super->s_encrypt_algos[0] =
                        EXT4_ENCRYPTION_MODE_AES_256_XTS;
                fs->super->s_encrypt_algos[1] =