[RFC 3/8] Gluks: Add the basic framework

[Hyman Huang <yong.huang@smartx.com>]

Gluks would be a built-in format in the QEMU block layer.

Signed-off-by: Hyman Huang <yong.huang@smartx.com>
---
 block/generic-luks.c | 81 ++++++++++++++++++++++++++++++++++++++++++++
 block/generic-luks.h | 26 ++++++++++++++
 block/meson.build    |  1 +
 3 files changed, 108 insertions(+)
 create mode 100644 block/generic-luks.c
 create mode 100644 block/generic-luks.h

diff --git a/block/generic-luks.c b/block/generic-luks.c
new file mode 100644
index 0000000000..f23e202991
--- /dev/null
+++ b/block/generic-luks.c
@@ -0,0 +1,81 @@
+/*
+ * QEMU block driver for the generic luks encryption
+ *
+ * Copyright (c) 2024 SmartX Inc
+ *
+ * Author: Hyman Huang <yong.huang@smartx.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include "qemu/osdep.h"
+
+#include "block/block_int.h"
+#include "block/crypto.h"
+#include "crypto/block.h"
+
+#include "generic-luks.h"
+
+/* BDRVGLUKSState holds the state of one generic LUKS instance */
+typedef struct BDRVGLUKSState {
+    BlockCrypto crypto;
+    BdrvChild *header;      /* LUKS header node */
+    uint64_t header_size;   /* In bytes */
+} BDRVGLUKSState;
+
+static int gluks_open(BlockDriverState *bs, QDict *options, int flags,
+                      Error **errp)
+{
+    return 0;
+}
+
+static int coroutine_fn GRAPH_UNLOCKED
+gluks_co_create_opts(BlockDriver *drv, const char *filename,
+                     QemuOpts *opts, Error **errp)
+{
+    return 0;
+}
+
+static void
+gluks_child_perms(BlockDriverState *bs, BdrvChild *c,
+                  const BdrvChildRole role,
+                  BlockReopenQueue *reopen_queue,
+                  uint64_t perm, uint64_t shared,
+                  uint64_t *nperm, uint64_t *nshared)
+{
+
+}
+
+static int64_t coroutine_fn GRAPH_RDLOCK
+gluks_co_getlength(BlockDriverState *bs)
+{
+    return 0;
+}
+
+static BlockDriver bdrv_generic_luks = {
+    .format_name            = "gluks",
+    .instance_size          = sizeof(BDRVGLUKSState),
+    .bdrv_open              = gluks_open,
+    .bdrv_co_create_opts    = gluks_co_create_opts,
+    .bdrv_child_perm        = gluks_child_perms,
+    .bdrv_co_getlength      = gluks_co_getlength,
+};
+
+static void block_generic_luks_init(void)
+{
+    bdrv_register(&bdrv_generic_luks);
+}
+
+block_init(block_generic_luks_init);
diff --git a/block/generic-luks.h b/block/generic-luks.h
new file mode 100644
index 0000000000..2aae866fa4
--- /dev/null
+++ b/block/generic-luks.h
@@ -0,0 +1,26 @@
+/*
+ * QEMU block driver for the generic luks encryption
+ *
+ * Copyright (c) 2024 SmartX Inc
+ *
+ * Author: Hyman Huang <yong.huang@smartx.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef GENERIC_LUKS_H
+#define GENERIC_LUKS_H
+
+#endif /* GENERIC_LUKS_H */
diff --git a/block/meson.build b/block/meson.build
index 59ff6d380c..74f2da7bed 100644
--- a/block/meson.build
+++ b/block/meson.build
@@ -39,6 +39,7 @@ block_ss.add(files(
   'throttle.c',
   'throttle-groups.c',
   'write-threshold.c',
+  'generic-luks.c',
 ), zstd, zlib, gnutls)
 
 system_ss.add(when: 'CONFIG_TCG', if_true: files('blkreplay.c'))
-- 
2.39.1