ubifs: Raise write version to 5
Starting with version 5 the following properties change:
- UBIFS_FLG_DOUBLE_HASH is mandatory
- UBIFS_FLG_ENCRYPTION is optional but depdens on UBIFS_FLG_DOUBLE_HASH
- Filesystems with unknown super block flags will be rejected, this
allows us in future to add new features without raising the UBIFS
write version.
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/fs/ubifs/sb.c b/fs/ubifs/sb.c
index 54cef70..7f1ead2 100644
--- a/fs/ubifs/sb.c
+++ b/fs/ubifs/sb.c
@@ -466,6 +466,16 @@
goto failed;
}
+ if (!c->double_hash && c->fmt_version >= 5) {
+ err = 16;
+ goto failed;
+ }
+
+ if (c->encrypted && c->fmt_version < 5) {
+ err = 17;
+ goto failed;
+ }
+
return 0;
failed:
@@ -624,6 +634,13 @@
c->double_hash = !!(sup_flags & UBIFS_FLG_DOUBLE_HASH);
c->encrypted = !!(sup_flags & UBIFS_FLG_ENCRYPTION);
+ if ((sup_flags & ~UBIFS_FLG_MASK) != 0) {
+ ubifs_err(c, "Unknown feature flags found: %#x",
+ sup_flags & ~UBIFS_FLG_MASK);
+ err = -EINVAL;
+ goto out;
+ }
+
#ifndef CONFIG_UBIFS_FS_ENCRYPTION
if (c->encrypted) {
ubifs_err(c, "file system contains encrypted files but UBIFS"