1/* 2 * Copyright (c) 2014-2015, Intel Corporation. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms and conditions of the GNU General Public License, 6 * version 2, as published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope it will be useful, but WITHOUT 9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for 11 * more details. 12 */ 13 14#ifndef __NVDIMM_PFN_H 15#define __NVDIMM_PFN_H 16 17#include <linux/types.h> 18#include <linux/mmzone.h> 19 20#define PFN_SIG_LEN 16 21#define PFN_SIG "NVDIMM_PFN_INFO\0" 22#define DAX_SIG "NVDIMM_DAX_INFO\0" 23 24struct nd_pfn_sb { 25 u8 signature[PFN_SIG_LEN]; 26 u8 uuid[16]; 27 u8 parent_uuid[16]; 28 __le32 flags; 29 __le16 version_major; 30 __le16 version_minor; 31 __le64 dataoff; /* relative to namespace_base + start_pad */ 32 __le64 npfns; 33 __le32 mode; 34 /* minor-version-1 additions for section alignment */ 35 /** 36 * @start_pad: Deprecated attribute to pad start-misaligned namespaces 37 * 38 * start_pad is deprecated because the original definition did 39 * not comprehend that dataoff is relative to the base address 40 * of the namespace not the start_pad adjusted base. The result 41 * is that the dax path is broken, but the block-I/O path is 42 * not. The kernel will no longer create namespaces using start 43 * padding, but it still supports block-I/O for legacy 44 * configurations mainly to allow a backup, reconfigure the 45 * namespace, and restore flow to repair dax operation. 46 */ 47 __le32 start_pad; 48 __le32 end_trunc; 49 /* minor-version-2 record the base alignment of the mapping */ 50 __le32 align; 51 /* minor-version-3 guarantee the padding and flags are zero */ 52 /* minor-version-4 record the page size and struct page size */ 53 __le32 page_size; 54 __le16 page_struct_size; 55 u8 padding[3994]; 56 __le64 checksum; 57}; 58 59#endif /* __NVDIMM_PFN_H */ 60