add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/nvdimm/pfn.h
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@@ -1,14 +1,6 @@
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+/* 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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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms and conditions of the GNU General Public License,
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- * version 2, as published by the Free Software Foundation.
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- *
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- * This program is distributed in the hope it will be useful, but WITHOUT
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- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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- * more details.
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  */
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 #ifndef __NVDIMM_PFN_H
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@@ -32,27 +24,28 @@
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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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-	u8 padding[4000];
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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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-#ifdef CONFIG_SPARSEMEM
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-#define PFN_SECTION_ALIGN_DOWN(x) SECTION_ALIGN_DOWN(x)
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-#define PFN_SECTION_ALIGN_UP(x) SECTION_ALIGN_UP(x)
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-#else
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-/*
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- * In this case ZONE_DEVICE=n and we will disable 'pfn' device support,
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- * but we still want pmem to compile.
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- */
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-#define PFN_SECTION_ALIGN_DOWN(x) (x)
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-#define PFN_SECTION_ALIGN_UP(x) (x)
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-#endif
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-
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-#define PHYS_SECTION_ALIGN_DOWN(x) PFN_PHYS(PFN_SECTION_ALIGN_DOWN(PHYS_PFN(x)))
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-#define PHYS_SECTION_ALIGN_UP(x) PFN_PHYS(PFN_SECTION_ALIGN_UP(PHYS_PFN(x)))
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 #endif /* __NVDIMM_PFN_H */