diff options
Diffstat (limited to 'drivers/nvdimm/pfn.h')
| -rw-r--r-- | drivers/nvdimm/pfn.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/drivers/nvdimm/pfn.h b/drivers/nvdimm/pfn.h new file mode 100644 index 0000000000..37cb1b8a2a --- /dev/null +++ b/drivers/nvdimm/pfn.h @@ -0,0 +1,51 @@ +/* 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 */ |