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- /* 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 */
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