mm/hugetlb: convert hugetlb_add_to_page_cache to take in a folio

Every caller of hugetlb_add_to_page_cache() is now passing in
&folio->page, change the function to take in a folio directly and clean up
the call sites.

Link: https://lkml.kernel.org/r/20230125170537.96973-7-sidhartha.kumar@oracle.comSigned-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: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

fs/hugetlbfs/inode.c

@@ -871,7 +871,7 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
 		}
 		clear_huge_page(&folio->page, addr, pages_per_huge_page(h));
 		__folio_mark_uptodate(folio);
-		error = hugetlb_add_to_page_cache(&folio->page, mapping, index);
+		error = hugetlb_add_to_page_cache(folio, mapping, index);
 		if (unlikely(error)) {
 			restore_reserve_on_error(h, &pseudo_vma, addr, folio);
 			folio_put(folio);

include/linux/hugetlb.h

@@ -723,7 +723,7 @@ struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid,
 				nodemask_t *nmask, gfp_t gfp_mask);
 struct folio *alloc_hugetlb_folio_vma(struct hstate *h, struct vm_area_struct *vma,
 				unsigned long address);
-int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
+int hugetlb_add_to_page_cache(struct folio *folio, struct address_space *mapping,
 			pgoff_t idx);
 void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
 				unsigned long address, struct folio *folio);

mm/hugetlb.c

@@ -5662,10 +5662,9 @@ static bool hugetlbfs_pagecache_present(struct hstate *h,
 	return present;
 }
 
-int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
+int hugetlb_add_to_page_cache(struct folio *folio, struct address_space *mapping,
 			   pgoff_t idx)
 {
-	struct folio *folio = page_folio(page);
 	struct inode *inode = mapping->host;
 	struct hstate *h = hstate_inode(inode);
 	int err;
@@ -5677,7 +5676,7 @@ int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
 		__folio_clear_locked(folio);
 		return err;
 	}
-	ClearHPageRestoreReserve(page);
+	folio_clear_hugetlb_restore_reserve(folio);
 
 	/*
 	 * mark folio dirty so that it will not be removed from cache/file
@@ -5836,7 +5835,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
 		new_folio = true;
 
 		if (vma->vm_flags & VM_MAYSHARE) {
-			int err = hugetlb_add_to_page_cache(&folio->page, mapping, idx);
+			int err = hugetlb_add_to_page_cache(folio, mapping, idx);
 			if (err) {
 				/*
 				 * err can't be -EEXIST which implies someone
@@ -6269,7 +6268,7 @@ 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(&folio->page, mapping, idx);
+		ret = hugetlb_add_to_page_cache(folio, mapping, idx);
 		if (ret)
 			goto out_release_nounlock;
 		folio_in_pagecache = true;