mm/hugetlb: convert hugetlb fault paths to use alloc_hugetlb_folio()
Change alloc_huge_page() to alloc_hugetlb_folio() by changing all callers to handle the now folio return type of the function. In this conversion, alloc_huge_page_vma() is also changed to alloc_hugetlb_folio_vma() and hugepage_add_new_anon_rmap() is changed to take in a folio directly. Many additions of '&folio->page' are cleaned up in subsequent patches. hugetlbfs_fallocate() is also refactored to use the RCU + page_cache_next_miss() API. Link: https://lkml.kernel.org/r/20230125170537.96973-5-sidhartha.kumar@oracle.com Suggested-by: Mike Kravetz <mike.kravetz@oracle.com> Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Sidhartha Kumar <sidhartha.kumar@oracle.com> Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Muchun Song <songmuchun@bytedance.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Sidhartha Kumar
Andrew Morton
parent
ea8e72f411
commit
d0ce0e47b3
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@ -819,8 +819,9 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
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* This is supposed to be the vaddr where the page is being
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* faulted in, but we have no vaddr here.
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*/
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struct page *page;
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struct folio *folio;
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unsigned long addr;
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bool present;
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cond_resched();
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@ -844,48 +845,49 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
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mutex_lock(&hugetlb_fault_mutex_table[hash]);
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/* See if already present in mapping to avoid alloc/free */
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page = find_get_page(mapping, index);
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if (page) {
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put_page(page);
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rcu_read_lock();
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present = page_cache_next_miss(mapping, index, 1) != index;
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rcu_read_unlock();
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if (present) {
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mutex_unlock(&hugetlb_fault_mutex_table[hash]);
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hugetlb_drop_vma_policy(&pseudo_vma);
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continue;
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}
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/*
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* Allocate page without setting the avoid_reserve argument.
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* Allocate folio without setting the avoid_reserve argument.
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* There certainly are no reserves associated with the
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* pseudo_vma. However, there could be shared mappings with
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* reserves for the file at the inode level. If we fallocate
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* pages in these areas, we need to consume the reserves
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* folios in these areas, we need to consume the reserves
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* to keep reservation accounting consistent.
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*/
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page = alloc_huge_page(&pseudo_vma, addr, 0);
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folio = alloc_hugetlb_folio(&pseudo_vma, addr, 0);
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hugetlb_drop_vma_policy(&pseudo_vma);
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if (IS_ERR(page)) {
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if (IS_ERR(folio)) {
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mutex_unlock(&hugetlb_fault_mutex_table[hash]);
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error = PTR_ERR(page);
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error = PTR_ERR(folio);
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goto out;
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}
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clear_huge_page(page, addr, pages_per_huge_page(h));
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__SetPageUptodate(page);
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error = hugetlb_add_to_page_cache(page, mapping, index);
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clear_huge_page(&folio->page, addr, pages_per_huge_page(h));
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__folio_mark_uptodate(folio);
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error = hugetlb_add_to_page_cache(&folio->page, mapping, index);
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if (unlikely(error)) {
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restore_reserve_on_error(h, &pseudo_vma, addr, page);
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put_page(page);
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restore_reserve_on_error(h, &pseudo_vma, addr, &folio->page);
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folio_put(folio);
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mutex_unlock(&hugetlb_fault_mutex_table[hash]);
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goto out;
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}
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mutex_unlock(&hugetlb_fault_mutex_table[hash]);
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SetHPageMigratable(page);
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folio_set_hugetlb_migratable(folio);
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/*
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* unlock_page because locked by hugetlb_add_to_page_cache()
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* put_page() due to reference from alloc_huge_page()
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* folio_unlock because locked by hugetlb_add_to_page_cache()
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* folio_put() due to reference from alloc_hugetlb_folio()
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*/
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unlock_page(page);
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put_page(page);
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folio_unlock(folio);
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folio_put(folio);
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}
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if (!(mode & FALLOC_FL_KEEP_SIZE) && offset + len > inode->i_size)
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@ -717,11 +717,11 @@ struct huge_bootmem_page {
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};
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int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list);
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struct page *alloc_huge_page(struct vm_area_struct *vma,
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struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
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unsigned long addr, int avoid_reserve);
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struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
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nodemask_t *nmask, gfp_t gfp_mask);
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struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
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struct folio *alloc_hugetlb_folio_vma(struct hstate *h, struct vm_area_struct *vma,
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unsigned long address);
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int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
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pgoff_t idx);
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@ -1033,7 +1033,7 @@ static inline int isolate_or_dissolve_huge_page(struct page *page,
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return -ENOMEM;
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}
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static inline struct page *alloc_huge_page(struct vm_area_struct *vma,
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static inline struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
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unsigned long addr,
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int avoid_reserve)
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{
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@ -1047,7 +1047,7 @@ alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
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return NULL;
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}
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static inline struct page *alloc_huge_page_vma(struct hstate *h,
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static inline struct folio *alloc_hugetlb_folio_vma(struct hstate *h,
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struct vm_area_struct *vma,
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unsigned long address)
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{
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@ -203,7 +203,7 @@ void page_remove_rmap(struct page *, struct vm_area_struct *,
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void hugepage_add_anon_rmap(struct page *, struct vm_area_struct *,
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unsigned long address, rmap_t flags);
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void hugepage_add_new_anon_rmap(struct page *, struct vm_area_struct *,
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void hugepage_add_new_anon_rmap(struct folio *, struct vm_area_struct *,
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unsigned long address);
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static inline void __page_dup_rmap(struct page *page, bool compound)
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201
mm/hugetlb.c
201
mm/hugetlb.c
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@ -2493,7 +2493,7 @@ struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
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}
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/* mempolicy aware migration callback */
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struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
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struct folio *alloc_hugetlb_folio_vma(struct hstate *h, struct vm_area_struct *vma,
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unsigned long address)
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{
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struct mempolicy *mpol;
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@ -2507,7 +2507,7 @@ struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
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folio = alloc_hugetlb_folio_nodemask(h, node, nodemask, gfp_mask);
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mpol_cond_put(mpol);
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return &folio->page;
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return folio;
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}
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/*
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@ -2798,14 +2798,14 @@ static long vma_del_reservation(struct hstate *h,
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/*
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* This routine is called to restore reservation information on error paths.
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* It should ONLY be called for pages allocated via alloc_huge_page(), and
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* the hugetlb mutex should remain held when calling this routine.
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* It should ONLY be called for folios allocated via alloc_hugetlb_folio(),
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* and the hugetlb mutex should remain held when calling this routine.
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*
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* It handles two specific cases:
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* 1) A reservation was in place and the page consumed the reservation.
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* HPageRestoreReserve is set in the page.
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* 2) No reservation was in place for the page, so HPageRestoreReserve is
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* not set. However, alloc_huge_page always updates the reserve map.
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* not set. However, alloc_hugetlb_folio always updates the reserve map.
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*
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* In case 1, free_huge_page later in the error path will increment the
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* global reserve count. But, free_huge_page does not have enough context
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@ -2814,7 +2814,7 @@ static long vma_del_reservation(struct hstate *h,
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* reserve count adjustments to be made by free_huge_page. Make sure the
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* reserve map indicates there is a reservation present.
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*
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* In case 2, simply undo reserve map modifications done by alloc_huge_page.
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* In case 2, simply undo reserve map modifications done by alloc_hugetlb_folio.
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*/
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void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
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unsigned long address, struct page *page)
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@ -2844,8 +2844,8 @@ void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
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if (!rc) {
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/*
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* This indicates there is an entry in the reserve map
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* not added by alloc_huge_page. We know it was added
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* before the alloc_huge_page call, otherwise
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* not added by alloc_hugetlb_folio. We know it was added
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* before the alloc_hugetlb_folio call, otherwise
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* hugetlb_restore_reserve would be set on the folio.
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* Remove the entry so that a subsequent allocation
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* does not consume a reservation.
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@ -3014,7 +3014,7 @@ int isolate_or_dissolve_huge_page(struct page *page, struct list_head *list)
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return ret;
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}
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struct page *alloc_huge_page(struct vm_area_struct *vma,
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struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma,
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unsigned long addr, int avoid_reserve)
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{
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struct hugepage_subpool *spool = subpool_vma(vma);
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@ -3023,7 +3023,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
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long map_chg, map_commit;
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long gbl_chg;
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int ret, idx;
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struct hugetlb_cgroup *h_cg;
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struct hugetlb_cgroup *h_cg = NULL;
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bool deferred_reserve;
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idx = hstate_index(h);
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@ -3130,7 +3130,7 @@ struct page *alloc_huge_page(struct vm_area_struct *vma,
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hugetlb_cgroup_uncharge_folio_rsvd(hstate_index(h),
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pages_per_huge_page(h), folio);
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}
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return &folio->page;
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return folio;
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out_uncharge_cgroup:
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hugetlb_cgroup_uncharge_cgroup(idx, pages_per_huge_page(h), h_cg);
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@ -4950,7 +4950,7 @@ hugetlb_install_folio(struct vm_area_struct *vma, pte_t *ptep, unsigned long add
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struct folio *new_folio)
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{
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__folio_mark_uptodate(new_folio);
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hugepage_add_new_anon_rmap(&new_folio->page, vma, addr);
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hugepage_add_new_anon_rmap(new_folio, vma, addr);
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set_huge_pte_at(vma->vm_mm, addr, ptep, make_huge_pte(vma, &new_folio->page, 1));
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hugetlb_count_add(pages_per_huge_page(hstate_vma(vma)), vma->vm_mm);
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folio_set_hugetlb_migratable(new_folio);
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@ -5080,34 +5080,34 @@ again:
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} else if (page_try_dup_anon_rmap(ptepage, true,
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src_vma)) {
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pte_t src_pte_old = entry;
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struct page *new;
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struct folio *new_folio;
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spin_unlock(src_ptl);
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spin_unlock(dst_ptl);
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/* Do not use reserve as it's private owned */
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new = alloc_huge_page(dst_vma, addr, 1);
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if (IS_ERR(new)) {
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new_folio = alloc_hugetlb_folio(dst_vma, addr, 1);
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if (IS_ERR(new_folio)) {
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put_page(ptepage);
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ret = PTR_ERR(new);
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ret = PTR_ERR(new_folio);
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break;
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}
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copy_user_huge_page(new, ptepage, addr, dst_vma,
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copy_user_huge_page(&new_folio->page, ptepage, addr, dst_vma,
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npages);
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put_page(ptepage);
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/* Install the new huge page if src pte stable */
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/* Install the new hugetlb folio if src pte stable */
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dst_ptl = huge_pte_lock(h, dst, dst_pte);
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src_ptl = huge_pte_lockptr(h, src, src_pte);
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spin_lock_nested(src_ptl, SINGLE_DEPTH_NESTING);
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entry = huge_ptep_get(src_pte);
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if (!pte_same(src_pte_old, entry)) {
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restore_reserve_on_error(h, dst_vma, addr,
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new);
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put_page(new);
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&new_folio->page);
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folio_put(new_folio);
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/* huge_ptep of dst_pte won't change as in child */
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goto again;
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}
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hugetlb_install_folio(dst_vma, dst_pte, addr, page_folio(new));
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hugetlb_install_folio(dst_vma, dst_pte, addr, new_folio);
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spin_unlock(src_ptl);
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spin_unlock(dst_ptl);
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continue;
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@ -5478,7 +5478,8 @@ static vm_fault_t hugetlb_wp(struct mm_struct *mm, struct vm_area_struct *vma,
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const bool unshare = flags & FAULT_FLAG_UNSHARE;
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pte_t pte;
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struct hstate *h = hstate_vma(vma);
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struct page *old_page, *new_page;
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struct page *old_page;
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struct folio *new_folio;
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int outside_reserve = 0;
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vm_fault_t ret = 0;
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unsigned long haddr = address & huge_page_mask(h);
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@ -5539,9 +5540,9 @@ retry_avoidcopy:
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* be acquired again before returning to the caller, as expected.
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*/
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spin_unlock(ptl);
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new_page = alloc_huge_page(vma, haddr, outside_reserve);
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new_folio = alloc_hugetlb_folio(vma, haddr, outside_reserve);
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if (IS_ERR(new_page)) {
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if (IS_ERR(new_folio)) {
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/*
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* If a process owning a MAP_PRIVATE mapping fails to COW,
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* it is due to references held by a child and an insufficient
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@ -5586,7 +5587,7 @@ retry_avoidcopy:
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return 0;
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}
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ret = vmf_error(PTR_ERR(new_page));
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ret = vmf_error(PTR_ERR(new_folio));
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goto out_release_old;
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}
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@ -5599,9 +5600,9 @@ retry_avoidcopy:
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goto out_release_all;
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}
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copy_user_huge_page(new_page, old_page, address, vma,
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copy_user_huge_page(&new_folio->page, old_page, address, vma,
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pages_per_huge_page(h));
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__SetPageUptodate(new_page);
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__folio_mark_uptodate(new_folio);
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mmu_notifier_range_init(&range, MMU_NOTIFY_CLEAR, 0, mm, haddr,
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haddr + huge_page_size(h));
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@ -5618,12 +5619,12 @@ retry_avoidcopy:
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huge_ptep_clear_flush(vma, haddr, ptep);
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mmu_notifier_invalidate_range(mm, range.start, range.end);
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page_remove_rmap(old_page, vma, true);
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hugepage_add_new_anon_rmap(new_page, vma, haddr);
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hugepage_add_new_anon_rmap(new_folio, vma, haddr);
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set_huge_pte_at(mm, haddr, ptep,
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make_huge_pte(vma, new_page, !unshare));
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SetHPageMigratable(new_page);
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make_huge_pte(vma, &new_folio->page, !unshare));
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folio_set_hugetlb_migratable(new_folio);
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/* Make the old page be freed below */
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new_page = old_page;
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new_folio = page_folio(old_page);
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}
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spin_unlock(ptl);
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mmu_notifier_invalidate_range_end(&range);
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@ -5632,9 +5633,9 @@ out_release_all:
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* No restore in case of successful pagetable update (Break COW or
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* unshare)
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*/
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if (new_page != old_page)
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restore_reserve_on_error(h, vma, haddr, new_page);
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put_page(new_page);
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if (new_folio != page_folio(old_page))
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restore_reserve_on_error(h, vma, haddr, &new_folio->page);
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folio_put(new_folio);
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out_release_old:
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put_page(old_page);
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@ -5753,11 +5754,11 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
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vm_fault_t ret = VM_FAULT_SIGBUS;
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int anon_rmap = 0;
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unsigned long size;
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struct page *page;
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struct folio *folio;
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pte_t new_pte;
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spinlock_t *ptl;
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unsigned long haddr = address & huge_page_mask(h);
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bool new_page, new_pagecache_page = false;
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bool new_folio, new_pagecache_folio = false;
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u32 hash = hugetlb_fault_mutex_hash(mapping, idx);
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/*
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@ -5776,9 +5777,9 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
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* Use page lock to guard against racing truncation
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* before we get page_table_lock.
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*/
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new_page = false;
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page = find_lock_page(mapping, idx);
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if (!page) {
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new_folio = false;
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folio = filemap_lock_folio(mapping, idx);
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if (!folio) {
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size = i_size_read(mapping->host) >> huge_page_shift(h);
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if (idx >= size)
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goto out;
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@ -5811,8 +5812,8 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
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VM_UFFD_MISSING);
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}
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page = alloc_huge_page(vma, haddr, 0);
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if (IS_ERR(page)) {
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folio = alloc_hugetlb_folio(vma, haddr, 0);
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||||
if (IS_ERR(folio)) {
|
||||
/*
|
||||
* Returning error will result in faulting task being
|
||||
* sent SIGBUS. The hugetlb fault mutex prevents two
|
||||
|
|
@ -5826,17 +5827,17 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
|
|||
* sure there really is no pte entry.
|
||||
*/
|
||||
if (hugetlb_pte_stable(h, mm, ptep, old_pte))
|
||||
ret = vmf_error(PTR_ERR(page));
|
||||
ret = vmf_error(PTR_ERR(folio));
|
||||
else
|
||||
ret = 0;
|
||||
goto out;
|
||||
}
|
||||
clear_huge_page(page, address, pages_per_huge_page(h));
|
||||
__SetPageUptodate(page);
|
||||
new_page = true;
|
||||
clear_huge_page(&folio->page, address, pages_per_huge_page(h));
|
||||
__folio_mark_uptodate(folio);
|
||||
new_folio = true;
|
||||
|
||||
if (vma->vm_flags & VM_MAYSHARE) {
|
||||
int err = hugetlb_add_to_page_cache(page, mapping, idx);
|
||||
int err = hugetlb_add_to_page_cache(&folio->page, mapping, idx);
|
||||
if (err) {
|
||||
/*
|
||||
* err can't be -EEXIST which implies someone
|
||||
|
|
@ -5845,13 +5846,13 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
|
|||
* to the page cache. So it's safe to call
|
||||
* restore_reserve_on_error() here.
|
||||
*/
|
||||
restore_reserve_on_error(h, vma, haddr, page);
|
||||
put_page(page);
|
||||
restore_reserve_on_error(h, vma, haddr, &folio->page);
|
||||
folio_put(folio);
|
||||
goto out;
|
||||
}
|
||||
new_pagecache_page = true;
|
||||
new_pagecache_folio = true;
|
||||
} else {
|
||||
lock_page(page);
|
||||
folio_lock(folio);
|
||||
if (unlikely(anon_vma_prepare(vma))) {
|
||||
ret = VM_FAULT_OOM;
|
||||
goto backout_unlocked;
|
||||
|
|
@ -5864,7 +5865,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
|
|||
* don't have hwpoisoned swap entry for errored virtual address.
|
||||
* So we need to block hugepage fault by PG_hwpoison bit check.
|
||||
*/
|
||||
if (unlikely(PageHWPoison(page))) {
|
||||
if (unlikely(folio_test_hwpoison(folio))) {
|
||||
ret = VM_FAULT_HWPOISON_LARGE |
|
||||
VM_FAULT_SET_HINDEX(hstate_index(h));
|
||||
goto backout_unlocked;
|
||||
|
|
@ -5872,8 +5873,8 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
|
|||
|
||||
/* Check for page in userfault range. */
|
||||
if (userfaultfd_minor(vma)) {
|
||||
unlock_page(page);
|
||||
put_page(page);
|
||||
folio_unlock(folio);
|
||||
folio_put(folio);
|
||||
/* See comment in userfaultfd_missing() block above */
|
||||
if (!hugetlb_pte_stable(h, mm, ptep, old_pte)) {
|
||||
ret = 0;
|
||||
|
|
@ -5907,10 +5908,10 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
|
|||
goto backout;
|
||||
|
||||
if (anon_rmap)
|
||||
hugepage_add_new_anon_rmap(page, vma, haddr);
|
||||
hugepage_add_new_anon_rmap(folio, vma, haddr);
|
||||
else
|
||||
page_dup_file_rmap(page, true);
|
||||
new_pte = make_huge_pte(vma, page, ((vma->vm_flags & VM_WRITE)
|
||||
page_dup_file_rmap(&folio->page, true);
|
||||
new_pte = make_huge_pte(vma, &folio->page, ((vma->vm_flags & VM_WRITE)
|
||||
&& (vma->vm_flags & VM_SHARED)));
|
||||
/*
|
||||
* If this pte was previously wr-protected, keep it wr-protected even
|
||||
|
|
@ -5923,20 +5924,20 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
|
|||
hugetlb_count_add(pages_per_huge_page(h), mm);
|
||||
if ((flags & FAULT_FLAG_WRITE) && !(vma->vm_flags & VM_SHARED)) {
|
||||
/* Optimization, do the COW without a second fault */
|
||||
ret = hugetlb_wp(mm, vma, address, ptep, flags, page, ptl);
|
||||
ret = hugetlb_wp(mm, vma, address, ptep, flags, &folio->page, ptl);
|
||||
}
|
||||
|
||||
spin_unlock(ptl);
|
||||
|
||||
/*
|
||||
* Only set HPageMigratable in newly allocated pages. Existing pages
|
||||
* found in the pagecache may not have HPageMigratableset if they have
|
||||
* Only set hugetlb_migratable in newly allocated pages. Existing pages
|
||||
* found in the pagecache may not have hugetlb_migratable if they have
|
||||
* been isolated for migration.
|
||||
*/
|
||||
if (new_page)
|
||||
SetHPageMigratable(page);
|
||||
if (new_folio)
|
||||
folio_set_hugetlb_migratable(folio);
|
||||
|
||||
unlock_page(page);
|
||||
folio_unlock(folio);
|
||||
out:
|
||||
hugetlb_vma_unlock_read(vma);
|
||||
mutex_unlock(&hugetlb_fault_mutex_table[hash]);
|
||||
|
|
@ -5945,11 +5946,11 @@ out:
|
|||
backout:
|
||||
spin_unlock(ptl);
|
||||
backout_unlocked:
|
||||
if (new_page && !new_pagecache_page)
|
||||
restore_reserve_on_error(h, vma, haddr, page);
|
||||
if (new_folio && !new_pagecache_folio)
|
||||
restore_reserve_on_error(h, vma, haddr, &folio->page);
|
||||
|
||||
unlock_page(page);
|
||||
put_page(page);
|
||||
folio_unlock(folio);
|
||||
folio_put(folio);
|
||||
goto out;
|
||||
}
|
||||
|
||||
|
|
@ -6173,16 +6174,16 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
|
|||
pte_t _dst_pte;
|
||||
spinlock_t *ptl;
|
||||
int ret = -ENOMEM;
|
||||
struct page *page;
|
||||
struct folio *folio;
|
||||
int writable;
|
||||
bool page_in_pagecache = false;
|
||||
bool folio_in_pagecache = false;
|
||||
|
||||
if (is_continue) {
|
||||
ret = -EFAULT;
|
||||
page = find_lock_page(mapping, idx);
|
||||
if (!page)
|
||||
folio = filemap_lock_folio(mapping, idx);
|
||||
if (!folio)
|
||||
goto out;
|
||||
page_in_pagecache = true;
|
||||
folio_in_pagecache = true;
|
||||
} else if (!*pagep) {
|
||||
/* If a page already exists, then it's UFFDIO_COPY for
|
||||
* a non-missing case. Return -EEXIST.
|
||||
|
|
@ -6193,34 +6194,34 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
|
|||
goto out;
|
||||
}
|
||||
|
||||
page = alloc_huge_page(dst_vma, dst_addr, 0);
|
||||
if (IS_ERR(page)) {
|
||||
folio = alloc_hugetlb_folio(dst_vma, dst_addr, 0);
|
||||
if (IS_ERR(folio)) {
|
||||
ret = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
|
||||
ret = copy_huge_page_from_user(page,
|
||||
ret = copy_huge_page_from_user(&folio->page,
|
||||
(const void __user *) src_addr,
|
||||
pages_per_huge_page(h), false);
|
||||
|
||||
/* fallback to copy_from_user outside mmap_lock */
|
||||
if (unlikely(ret)) {
|
||||
ret = -ENOENT;
|
||||
/* Free the allocated page which may have
|
||||
/* Free the allocated folio which may have
|
||||
* consumed a reservation.
|
||||
*/
|
||||
restore_reserve_on_error(h, dst_vma, dst_addr, page);
|
||||
put_page(page);
|
||||
restore_reserve_on_error(h, dst_vma, dst_addr, &folio->page);
|
||||
folio_put(folio);
|
||||
|
||||
/* Allocate a temporary page to hold the copied
|
||||
/* Allocate a temporary folio to hold the copied
|
||||
* contents.
|
||||
*/
|
||||
page = alloc_huge_page_vma(h, dst_vma, dst_addr);
|
||||
if (!page) {
|
||||
folio = alloc_hugetlb_folio_vma(h, dst_vma, dst_addr);
|
||||
if (!folio) {
|
||||
ret = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
*pagep = page;
|
||||
*pagep = &folio->page;
|
||||
/* Set the outparam pagep and return to the caller to
|
||||
* copy the contents outside the lock. Don't free the
|
||||
* page.
|
||||
|
|
@ -6236,25 +6237,25 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
|
|||
goto out;
|
||||
}
|
||||
|
||||
page = alloc_huge_page(dst_vma, dst_addr, 0);
|
||||
if (IS_ERR(page)) {
|
||||
folio = alloc_hugetlb_folio(dst_vma, dst_addr, 0);
|
||||
if (IS_ERR(folio)) {
|
||||
put_page(*pagep);
|
||||
ret = -ENOMEM;
|
||||
*pagep = NULL;
|
||||
goto out;
|
||||
}
|
||||
copy_user_huge_page(page, *pagep, dst_addr, dst_vma,
|
||||
copy_user_huge_page(&folio->page, *pagep, dst_addr, dst_vma,
|
||||
pages_per_huge_page(h));
|
||||
put_page(*pagep);
|
||||
*pagep = NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* The memory barrier inside __SetPageUptodate makes sure that
|
||||
* The memory barrier inside __folio_mark_uptodate makes sure that
|
||||
* preceding stores to the page contents become visible before
|
||||
* the set_pte_at() write.
|
||||
*/
|
||||
__SetPageUptodate(page);
|
||||
__folio_mark_uptodate(folio);
|
||||
|
||||
/* Add shared, newly allocated pages to the page cache. */
|
||||
if (vm_shared && !is_continue) {
|
||||
|
|
@ -6269,16 +6270,16 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
|
|||
* hugetlb_fault_mutex_table that here must be hold by
|
||||
* the caller.
|
||||
*/
|
||||
ret = hugetlb_add_to_page_cache(page, mapping, idx);
|
||||
ret = hugetlb_add_to_page_cache(&folio->page, mapping, idx);
|
||||
if (ret)
|
||||
goto out_release_nounlock;
|
||||
page_in_pagecache = true;
|
||||
folio_in_pagecache = true;
|
||||
}
|
||||
|
||||
ptl = huge_pte_lock(h, dst_mm, dst_pte);
|
||||
|
||||
ret = -EIO;
|
||||
if (PageHWPoison(page))
|
||||
if (folio_test_hwpoison(folio))
|
||||
goto out_release_unlock;
|
||||
|
||||
/*
|
||||
|
|
@ -6290,10 +6291,10 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
|
|||
if (!huge_pte_none_mostly(huge_ptep_get(dst_pte)))
|
||||
goto out_release_unlock;
|
||||
|
||||
if (page_in_pagecache)
|
||||
page_dup_file_rmap(page, true);
|
||||
if (folio_in_pagecache)
|
||||
page_dup_file_rmap(&folio->page, true);
|
||||
else
|
||||
hugepage_add_new_anon_rmap(page, dst_vma, dst_addr);
|
||||
hugepage_add_new_anon_rmap(folio, dst_vma, dst_addr);
|
||||
|
||||
/*
|
||||
* For either: (1) CONTINUE on a non-shared VMA, or (2) UFFDIO_COPY
|
||||
|
|
@ -6304,7 +6305,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
|
|||
else
|
||||
writable = dst_vma->vm_flags & VM_WRITE;
|
||||
|
||||
_dst_pte = make_huge_pte(dst_vma, page, writable);
|
||||
_dst_pte = make_huge_pte(dst_vma, &folio->page, writable);
|
||||
/*
|
||||
* Always mark UFFDIO_COPY page dirty; note that this may not be
|
||||
* extremely important for hugetlbfs for now since swapping is not
|
||||
|
|
@ -6326,20 +6327,20 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
|
|||
|
||||
spin_unlock(ptl);
|
||||
if (!is_continue)
|
||||
SetHPageMigratable(page);
|
||||
folio_set_hugetlb_migratable(folio);
|
||||
if (vm_shared || is_continue)
|
||||
unlock_page(page);
|
||||
folio_unlock(folio);
|
||||
ret = 0;
|
||||
out:
|
||||
return ret;
|
||||
out_release_unlock:
|
||||
spin_unlock(ptl);
|
||||
if (vm_shared || is_continue)
|
||||
unlock_page(page);
|
||||
folio_unlock(folio);
|
||||
out_release_nounlock:
|
||||
if (!page_in_pagecache)
|
||||
restore_reserve_on_error(h, dst_vma, dst_addr, page);
|
||||
put_page(page);
|
||||
if (!folio_in_pagecache)
|
||||
restore_reserve_on_error(h, dst_vma, dst_addr, &folio->page);
|
||||
folio_put(folio);
|
||||
goto out;
|
||||
}
|
||||
#endif /* CONFIG_USERFAULTFD */
|
||||
|
|
@ -6871,7 +6872,7 @@ bool hugetlb_reserve_pages(struct inode *inode,
|
|||
/*
|
||||
* pages in this range were added to the reserve
|
||||
* map between region_chg and region_add. This
|
||||
* indicates a race with alloc_huge_page. Adjust
|
||||
* indicates a race with alloc_hugetlb_folio. Adjust
|
||||
* the subpool and reserve counts modified above
|
||||
* based on the difference.
|
||||
*/
|
||||
|
|
|
|||
|
|
@ -1210,9 +1210,11 @@ static struct page *new_page(struct page *page, unsigned long start)
|
|||
break;
|
||||
}
|
||||
|
||||
if (folio_test_hugetlb(src))
|
||||
return alloc_huge_page_vma(page_hstate(&src->page),
|
||||
if (folio_test_hugetlb(src)) {
|
||||
dst = alloc_hugetlb_folio_vma(folio_hstate(src),
|
||||
vma, address);
|
||||
return &dst->page;
|
||||
}
|
||||
|
||||
if (folio_test_large(src))
|
||||
gfp = GFP_TRANSHUGE;
|
||||
|
|
|
|||
|
|
@ -2534,15 +2534,13 @@ void hugepage_add_anon_rmap(struct page *page, struct vm_area_struct *vma,
|
|||
!!(flags & RMAP_EXCLUSIVE));
|
||||
}
|
||||
|
||||
void hugepage_add_new_anon_rmap(struct page *page,
|
||||
void hugepage_add_new_anon_rmap(struct folio *folio,
|
||||
struct vm_area_struct *vma, unsigned long address)
|
||||
{
|
||||
struct folio *folio = page_folio(page);
|
||||
|
||||
BUG_ON(address < vma->vm_start || address >= vma->vm_end);
|
||||
/* increment count (starts at -1) */
|
||||
atomic_set(&folio->_entire_mapcount, 0);
|
||||
folio_clear_hugetlb_restore_reserve(folio);
|
||||
__page_set_anon_rmap(folio, page, vma, address, 1);
|
||||
__page_set_anon_rmap(folio, &folio->page, vma, address, 1);
|
||||
}
|
||||
#endif /* CONFIG_HUGETLB_PAGE */
|
||||
|
|
|
|||
Loading…
Reference in New Issue