1 files changed, 57 insertions, 0 deletions
diff --git a/fs/btrfs/compat.h b/fs/btrfs/compat.h
new file mode 100644
index 0000000000..b354c17a5c
--- /dev/null
+++ b/fs/btrfs/compat.h
@@ -0,0 +1,57 @@
+// SPDX-License-Identifier: GPL-2.0+
+
+#ifndef __BTRFS_COMPAT_H__
+#define __BTRFS_COMPAT_H__
+
+#include <linux/errno.h>
+#include <fs_internal.h>
+#include <uuid.h>
+
+/* Provide a compatibility layer to make code syncing easier */
+
+/* A simple wraper to for error() used in btrfs-progs */
+#define error(fmt, ...)		pr_err("BTRFS: " fmt "\n", ##__VA_ARGS__)
+
+#define BTRFS_UUID_UNPARSED_SIZE	37
+
+/*
+ * Macros to generate set/get funcs for the struct fields
+ * assume there is a lefoo_to_cpu for every type, so lets make a simple
+ * one for u8:
+ */
+#define le8_to_cpu(v) (v)
+#define cpu_to_le8(v) (v)
+#define __le8 u8
+
+/*
+ * Read data from device specified by @desc and @part
+ *
+ * U-boot equivalent of pread().
+ *
+ * Return the bytes of data read.
+ * Return <0 for error.
+ */
+static inline int __btrfs_devread(struct blk_desc *desc,
+				  struct disk_partition *part,
+				  void *buf, size_t size, u64 offset)
+{
+	lbaint_t sector;
+	int byte_offset;
+	int ret;
+
+	sector = offset >> desc->log2blksz;
+	byte_offset = offset % desc->blksz;
+
+	/* fs_devread() return 0 for error, >0 for success */
+	ret = fs_devread(desc, part, sector, byte_offset, size, buf);
+	if (!ret)
+		return -EIO;
+	return size;
+}
+
+static inline void uuid_unparse(const u8 *uuid, char *out)
+{
+	return uuid_bin_to_str((unsigned char *)uuid, out, 0);
+}
+
+#endif