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