/* 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 */