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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>
51 lines
1.3 KiB
C
51 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014-2016, Intel Corporation.
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*/
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#include "test/nfit_test.h"
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#include <linux/blkdev.h>
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#include <linux/dax.h>
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#include <pmem.h>
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#include <nd.h>
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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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{
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resource_size_t offset = PFN_PHYS(pgoff) + pmem->data_offset;
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if (unlikely(is_bad_pmem(&pmem->bb, PFN_PHYS(pgoff) / 512,
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PFN_PHYS(nr_pages))))
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return -EIO;
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/*
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* Limit dax to a single page at a time given vmalloc()-backed
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* in the nfit_test case.
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*/
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if (get_nfit_res(pmem->phys_addr + offset)) {
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struct page *page;
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if (kaddr)
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*kaddr = pmem->virt_addr + offset;
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page = vmalloc_to_page(pmem->virt_addr + offset);
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if (pfn)
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*pfn = page_to_pfn_t(page);
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pr_debug_ratelimited("%s: pmem: %p pgoff: %#lx pfn: %#lx\n",
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__func__, pmem, pgoff, page_to_pfn(page));
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return 1;
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}
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if (kaddr)
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*kaddr = pmem->virt_addr + offset;
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if (pfn)
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*pfn = phys_to_pfn_t(pmem->phys_addr + offset, pmem->pfn_flags);
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/*
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* If badblocks are present, limit known good range to the
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* requested range.
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*/
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if (unlikely(pmem->bb.count))
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return nr_pages;
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return PHYS_PFN(pmem->size - pmem->pfn_pad - offset);
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}
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