tmp64 = (long long)max_buds * c->leb_size;
if (big_lpt)
sup_flags |= UBIFS_FLG_BIGLPT;
+ sup_flags |= UBIFS_FLG_DOUBLE_HASH;
sup->ch.node_type = UBIFS_SB_NODE;
sup->key_hash = UBIFS_KEY_HASH_R5;
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:
memcpy(&c->uuid, &sup->uuid, 16);
c->big_lpt = !!(sup_flags & UBIFS_FLG_BIGLPT);
c->space_fixup = !!(sup_flags & UBIFS_FLG_SPACE_FIXUP);
+ 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"
+ " was built without crypto support.");
+ err = -EINVAL;
+ goto out;
+ }
+#endif
/* Automatically increase file system size to the maximum size */
c->old_leb_cnt = c->leb_cnt;
ubifs_msg(c, "free space fixup complete");
return err;
}
+
+int ubifs_enable_encryption(struct ubifs_info *c)
+{
+ int err;
+ struct ubifs_sb_node *sup;
+
+ if (c->encrypted)
+ return 0;
+
+ if (c->ro_mount || c->ro_media)
+ return -EROFS;
+
+ if (c->fmt_version < 5) {
+ ubifs_err(c, "on-flash format version 5 is needed for encryption");
+ return -EINVAL;
+ }
+
+ sup = ubifs_read_sb_node(c);
+ if (IS_ERR(sup))
+ return PTR_ERR(sup);
+
+ sup->flags |= cpu_to_le32(UBIFS_FLG_ENCRYPTION);
+
+ err = ubifs_write_sb_node(c, sup);
+ if (!err)
+ c->encrypted = 1;
+ kfree(sup);
+
+ return err;
+}