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 */ 52