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23 lines
617 B
23 lines
617 B
// SPDX-License-Identifier: GPL-2.0 |
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#include <linux/bio.h> |
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#include <linux/export.h> |
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#include <xen/xen.h> |
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#include <xen/page.h> |
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/* check if @page can be merged with 'vec1' */ |
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bool xen_biovec_phys_mergeable(const struct bio_vec *vec1, |
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const struct page *page) |
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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(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 false; |
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#endif |
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}
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