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e511c4a3d2
Up till now, dax_direct_access() is used implicitly for normal
access, but for the purpose of recovery write, dax range with
poison is requested. To make the interface clear, introduce
enum dax_access_mode {
DAX_ACCESS,
DAX_RECOVERY_WRITE,
}
where DAX_ACCESS is used for normal dax access, and
DAX_RECOVERY_WRITE is used for dax recovery write.
Suggested-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Jane Chu <jane.chu@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Vivek Goyal <vgoyal@redhat.com>
Link: https://lore.kernel.org/r/165247982851.52965.11024212198889762949.stgit@dwillia2-desk3.amr.corp.intel.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __NVDIMM_PMEM_H__
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#define __NVDIMM_PMEM_H__
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#include <linux/page-flags.h>
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#include <linux/badblocks.h>
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#include <linux/memremap.h>
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#include <linux/types.h>
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#include <linux/pfn_t.h>
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#include <linux/fs.h>
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enum dax_access_mode;
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/* this definition is in it's own header for tools/testing/nvdimm to consume */
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struct pmem_device {
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/* One contiguous memory region per device */
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phys_addr_t phys_addr;
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/* when non-zero this device is hosting a 'pfn' instance */
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phys_addr_t data_offset;
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u64 pfn_flags;
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void *virt_addr;
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/* immutable base size of the namespace */
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size_t size;
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/* trim size when namespace capacity has been section aligned */
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u32 pfn_pad;
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struct kernfs_node *bb_state;
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struct badblocks bb;
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struct dax_device *dax_dev;
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struct gendisk *disk;
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struct dev_pagemap pgmap;
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};
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long __pmem_direct_access(struct pmem_device *pmem, pgoff_t pgoff,
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long nr_pages, enum dax_access_mode mode, void **kaddr,
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pfn_t *pfn);
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#ifdef CONFIG_MEMORY_FAILURE
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static inline bool test_and_clear_pmem_poison(struct page *page)
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{
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return TestClearPageHWPoison(page);
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}
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#else
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static inline bool test_and_clear_pmem_poison(struct page *page)
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{
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return false;
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}
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#endif
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#endif /* __NVDIMM_PMEM_H__ */
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