From c0324e29b4494560ed68af50f7be814838e2bfc3 Mon Sep 17 00:00:00 2001
From: zhangxiaoyu <zhangxiaoyu58@huawei.com>
Date: Fri, 29 Dec 2023 16:26:13 +0800
Subject: [PATCH] add storage block code for embedded image

Signed-off-by: zhangxiaoyu <zhangxiaoyu58@huawei.com>
---
 src/lxc/meson.build       |  2 +
 src/lxc/storage/block.c   | 86 +++++++++++++++++++++++++++++++++++++++
 src/lxc/storage/block.h   | 41 +++++++++++++++++++
 src/lxc/storage/storage.c | 24 +++++++++++
 4 files changed, 153 insertions(+)
 create mode 100644 src/lxc/storage/block.c
 create mode 100644 src/lxc/storage/block.h

diff --git a/src/lxc/meson.build b/src/lxc/meson.build
index 6c4ba6a..bffed73 100644
--- a/src/lxc/meson.build
+++ b/src/lxc/meson.build
@@ -145,6 +145,8 @@ if want_isulad
         'exec_commands.h',
         'isulad_utils.c',
         'isulad_utils.h',
+        'storage/block.c',
+        'storage/block.h',
         'path.c',
         'path.h',
         'json/defs.c',
diff --git a/src/lxc/storage/block.c b/src/lxc/storage/block.c
new file mode 100644
index 0000000..eb75e70
--- /dev/null
+++ b/src/lxc/storage/block.c
@@ -0,0 +1,86 @@
+/*
+ * lxc: linux Container library
+ *
+ * (C) Copyright IBM Corp. 2007, 2008
+ *
+ * Authors:
+ * Daniel Lezcano <daniel.lezcano at free.fr>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+#include <stdint.h>
+#include <string.h>
+
+#include "config.h"
+#include "log.h"
+#include "storage.h"
+#include "storage_utils.h"
+#include "utils.h"
+
+lxc_log_define(blk, lxc);
+
+int blk_destroy(struct lxc_storage *orig)
+{
+	return 0;
+}
+
+bool blk_detect(const char *path)
+{
+	struct stat statbuf;
+	int ret;
+
+	if (!strncmp(path, "blk:", 4))
+		return true;
+
+	ret = stat(path, &statbuf);
+	if (ret == -1 && errno == EPERM) {
+		SYSERROR("blk_detect: failed to look at \"%s\"", path);
+		return false;
+	}
+
+	if (ret == 0 && S_ISBLK(statbuf.st_mode))
+		return true;
+
+	return false;
+}
+
+int blk_mount(struct lxc_storage *bdev)
+{
+	const char *src;
+	if (strcmp(bdev->type, "blk"))
+		return -22;
+
+	if (!bdev->src || !bdev->dest)
+		return -22;
+
+	src = lxc_storage_get_path(bdev->src, bdev->type);
+
+	return mount_unknown_fs(src, bdev->dest, bdev->mntopts);
+}
+
+int blk_umount(struct lxc_storage *bdev)
+{
+	if (strcmp(bdev->type, "blk"))
+		return -22;
+
+	if (!bdev->src || !bdev->dest)
+		return -22;
+
+	return umount(bdev->dest);
+}
diff --git a/src/lxc/storage/block.h b/src/lxc/storage/block.h
new file mode 100644
index 0000000..2fa7565
--- /dev/null
+++ b/src/lxc/storage/block.h
@@ -0,0 +1,41 @@
+/*
+ * lxc: linux Container library
+ *
+ * (C) Copyright IBM Corp. 2007, 2008
+ *
+ * Authors:
+ * Daniel Lezcano <daniel.lezcano at free.fr>
+ *
+ * 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, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __LXC_BLK_H
+#define __LXC_BLK_H
+
+#include <stdbool.h>
+#include <stdint.h>
+
+struct lxc_storage;
+
+struct bdev_specs;
+
+struct lxc_conf;
+
+extern int blk_destroy(struct lxc_storage *orig);
+extern bool blk_detect(const char *path);
+extern int blk_mount(struct lxc_storage *bdev);
+extern int blk_umount(struct lxc_storage *bdev);
+
+#endif /* __LXC_BLK_H */
diff --git a/src/lxc/storage/storage.c b/src/lxc/storage/storage.c
index 39756d0..2aa26f9 100644
--- a/src/lxc/storage/storage.c
+++ b/src/lxc/storage/storage.c
@@ -39,6 +39,10 @@
 #include "storage_utils.h"
 #include "utils.h"
 #include "zfs.h"
+#ifdef HAVE_ISULAD
+#include "block.h"
+#endif
+
 
 #if !HAVE_STRLCPY
 #include "strlcpy.h"
@@ -162,6 +166,22 @@ static const struct lxc_storage_ops zfs_ops = {
     .can_backup = true,
 };
 
+#ifdef HAVE_ISULAD
+/* block */
+static const struct lxc_storage_ops blk_ops = {
+    .detect = &blk_detect,
+    .mount = &blk_mount,
+    .umount = &blk_umount,
+    .clone_paths = NULL,
+    .destroy = &blk_destroy,
+    .create = NULL,
+    .copy = NULL,
+    .snapshot = NULL,
+    .can_snapshot = false,
+    .can_backup = true,
+};
+#endif
+
 struct lxc_storage_type {
 	const char *name;
 	const struct lxc_storage_ops *ops;
@@ -177,6 +197,10 @@ static const struct lxc_storage_type bdevs[] = {
 	{ .name = "overlayfs", .ops = &ovl_ops,   },
 	{ .name = "loop",      .ops = &loop_ops,  },
 	{ .name = "nbd",       .ops = &nbd_ops,   },
+#ifdef HAVE_ISULAD
+	//isulad: block device
+	{ .name = "blk",       .ops = &blk_ops,   },
+#endif
 };
 
 static const size_t numbdevs = sizeof(bdevs) / sizeof(struct lxc_storage_type);
-- 
2.25.1