Release 4.9 drivers/xen/biomerge.c

#include <linux/bio.h>
#include <linux/io.h>
#include <linux/export.h>
#include <xen/page.h>



bool xen_biovec_phys_mergeable(const struct bio_vec *vec1,
			       const struct bio_vec *vec2)
{
#if XEN_PAGE_SIZE == PAGE_SIZE
	unsigned long bfn1 = pfn_to_bfn(page_to_pfn(vec1->bv_page));
	unsigned long bfn2 = pfn_to_bfn(page_to_pfn(vec2->bv_page));

	return __BIOVEC_PHYS_MERGEABLE(vec1, vec2) &&
		((bfn1 == bfn2) || ((bfn1+1) == bfn2));
#else
	/*
         * XXX: Add support for merging bio_vec when using different page
         * size in Xen and Linux.
         */
	return 0;
#endif
}
Contributors
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jeremy fitzhardinge
jeremy fitzhardinge
63
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julien grall
julien grall
21
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2
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84
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3
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EXPORT_SYMBOL(xen_biovec_phys_mergeable);
Overall Contributors
Person
Tokens
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jeremy fitzhardinge
jeremy fitzhardinge
72
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1
20.00%
julien grall
julien grall
21
20.79%
2
40.00%
matthew wilcox
matthew wilcox
5
4.95%
1
20.00%
stephen rothwell
stephen rothwell
3
2.97%
1
20.00%
Total
101
100.00%
5
100.00%
  
Directory: drivers/xen