Messages in this thread Patch in this message | | | From | Yin Fengwei <> | Subject | [PATCH v2 1/3] mm: add functions folio_in_range() and folio_within_vma() | Date | Wed, 9 Aug 2023 14:11:03 +0800 |
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It will be used to check whether the folio is mapped to specific VMA and whether the mapping address of folio is in the range.
Also a helper function folio_within_vma() to check whether folio is in the range of vma based on folio_in_range().
Signed-off-by: Yin Fengwei <fengwei.yin@intel.com> --- mm/internal.h | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+)
diff --git a/mm/internal.h b/mm/internal.h index 154da4f0d557..5d1b71010fd2 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -585,6 +585,41 @@ extern long faultin_vma_page_range(struct vm_area_struct *vma, bool write, int *locked); extern bool mlock_future_ok(struct mm_struct *mm, unsigned long flags, unsigned long bytes); + +static inline bool +folio_in_range(struct folio *folio, struct vm_area_struct *vma, + unsigned long start, unsigned long end) +{ + pgoff_t pgoff, addr; + unsigned long vma_pglen = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT; + + VM_WARN_ON_FOLIO(folio_test_ksm(folio), folio); + if (start > end) + return false; + + if (start < vma->vm_start) + start = vma->vm_start; + + if (end > vma->vm_end) + end = vma->vm_end; + + pgoff = folio_pgoff(folio); + + /* if folio start address is not in vma range */ + if (!in_range(pgoff, vma->vm_pgoff, vma_pglen)) + return false; + + addr = vma->vm_start + ((pgoff - vma->vm_pgoff) << PAGE_SHIFT); + + return !(addr < start || end - addr < folio_size(folio)); +} + +static inline bool +folio_within_vma(struct folio *folio, struct vm_area_struct *vma) +{ + return folio_in_range(folio, vma, vma->vm_start, vma->vm_end); +} + /* * mlock_vma_folio() and munlock_vma_folio(): * should be called with vma's mmap_lock held for read or write, -- 2.39.2
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