23 lines
585 B
C
23 lines
585 B
C
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#include <linux/bio.h>
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#include <linux/io.h>
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#include <linux/export.h>
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#include <xen/page.h>
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bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
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const struct bio_vec *vec2)
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{
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#if XEN_PAGE_SIZE == PAGE_SIZE
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unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page));
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unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page));
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return bfn1 + PFN_DOWN(vec1->bv_offset + vec1->bv_len) == bfn2;
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#else
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/*
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* XXX: Add support for merging bio_vec when using different page
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* size in Xen and Linux.
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*/
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return 0;
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#endif
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}
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EXPORT_SYMBOL(xen_biovec_phys_mergeable);
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