| 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* |
| 3 | * Copyright (c) 2014-2015, Intel Corporation. |
| 4 | */ |
| 5 | |
| 6 | #ifndef __NVDIMM_PFN_H |
| 7 | #define __NVDIMM_PFN_H |
| 8 | |
| 9 | #include <linux/types.h> |
| 10 | #include <linux/mmzone.h> |
| 11 | |
| 12 | #define PFN_SIG_LEN 16 |
| 13 | #define PFN_SIG "NVDIMM_PFN_INFO\0" |
| 14 | #define DAX_SIG "NVDIMM_DAX_INFO\0" |
| 15 | |
| 16 | struct nd_pfn_sb { |
| 17 | u8 signature[PFN_SIG_LEN]; |
| 18 | u8 uuid[16]; |
| 19 | u8 parent_uuid[16]; |
| 20 | __le32 flags; |
| 21 | __le16 version_major; |
| 22 | __le16 version_minor; |
| 23 | __le64 dataoff; /* relative to namespace_base + start_pad */ |
| 24 | __le64 npfns; |
| 25 | __le32 mode; |
| 26 | /* minor-version-1 additions for section alignment */ |
| 27 | /** |
| 28 | * @start_pad: Deprecated attribute to pad start-misaligned namespaces |
| 29 | * |
| 30 | * start_pad is deprecated because the original definition did |
| 31 | * not comprehend that dataoff is relative to the base address |
| 32 | * of the namespace not the start_pad adjusted base. The result |
| 33 | * is that the dax path is broken, but the block-I/O path is |
| 34 | * not. The kernel will no longer create namespaces using start |
| 35 | * padding, but it still supports block-I/O for legacy |
| 36 | * configurations mainly to allow a backup, reconfigure the |
| 37 | * namespace, and restore flow to repair dax operation. |
| 38 | */ |
| 39 | __le32 start_pad; |
| 40 | __le32 end_trunc; |
| 41 | /* minor-version-2 record the base alignment of the mapping */ |
| 42 | __le32 align; |
| 43 | /* minor-version-3 guarantee the padding and flags are zero */ |
| 44 | /* minor-version-4 record the page size and struct page size */ |
| 45 | __le32 page_size; |
| 46 | __le16 page_struct_size; |
| 47 | u8 padding[3994]; |
| 48 | __le64 checksum; |
| 49 | }; |
| 50 | |
| 51 | #endif /* __NVDIMM_PFN_H */ |