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-rw-r--r--drivers/nvdimm/pfn.h51
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/nvdimm/pfn.h b/drivers/nvdimm/pfn.h
new file mode 100644
index 0000000000..37cb1b8a2a
--- /dev/null
+++ b/drivers/nvdimm/pfn.h
@@ -0,0 +1,51 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2014-2015, Intel Corporation.
+ */
+
+#ifndef __NVDIMM_PFN_H
+#define __NVDIMM_PFN_H
+
+#include <linux/types.h>
+#include <linux/mmzone.h>
+
+#define PFN_SIG_LEN 16
+#define PFN_SIG "NVDIMM_PFN_INFO\0"
+#define DAX_SIG "NVDIMM_DAX_INFO\0"
+
+struct nd_pfn_sb {
+ u8 signature[PFN_SIG_LEN];
+ u8 uuid[16];
+ u8 parent_uuid[16];
+ __le32 flags;
+ __le16 version_major;
+ __le16 version_minor;
+ __le64 dataoff; /* relative to namespace_base + start_pad */
+ __le64 npfns;
+ __le32 mode;
+ /* minor-version-1 additions for section alignment */
+ /**
+ * @start_pad: Deprecated attribute to pad start-misaligned namespaces
+ *
+ * start_pad is deprecated because the original definition did
+ * not comprehend that dataoff is relative to the base address
+ * of the namespace not the start_pad adjusted base. The result
+ * is that the dax path is broken, but the block-I/O path is
+ * not. The kernel will no longer create namespaces using start
+ * padding, but it still supports block-I/O for legacy
+ * configurations mainly to allow a backup, reconfigure the
+ * namespace, and restore flow to repair dax operation.
+ */
+ __le32 start_pad;
+ __le32 end_trunc;
+ /* minor-version-2 record the base alignment of the mapping */
+ __le32 align;
+ /* minor-version-3 guarantee the padding and flags are zero */
+ /* minor-version-4 record the page size and struct page size */
+ __le32 page_size;
+ __le16 page_struct_size;
+ u8 padding[3994];
+ __le64 checksum;
+};
+
+#endif /* __NVDIMM_PFN_H */