From 28c209f73c9c84491590c679f7ea77c9a7109e48 Mon Sep 17 00:00:00 2001 From: "Matthew Wilcox (Oracle)" Date: Thu, 12 May 2022 20:23:05 -0700 Subject: [PATCH] mm/shmem: convert shmem_getpage_gfp to use a folio Rename shmem_alloc_and_acct_page() to shmem_alloc_and_acct_folio() and have it return a folio, then use a folio throuughout shmem_getpage_gfp(). It continues to return a struct page. Link: https://lkml.kernel.org/r/20220504182857.4013401-23-willy@infradead.org Signed-off-by: Matthew Wilcox (Oracle) Reviewed-by: Christoph Hellwig Signed-off-by: Andrew Morton --- mm/shmem.c | 95 ++++++++++++++++++++++++------------------------------ 1 file changed, 43 insertions(+), 52 deletions(-) diff --git a/mm/shmem.c b/mm/shmem.c index d5b23932357d3..edcaba7c67ff3 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -1563,8 +1563,7 @@ static struct page *shmem_alloc_page(gfp_t gfp, return &shmem_alloc_folio(gfp, info, index)->page; } -static struct page *shmem_alloc_and_acct_page(gfp_t gfp, - struct inode *inode, +static struct folio *shmem_alloc_and_acct_folio(gfp_t gfp, struct inode *inode, pgoff_t index, bool huge) { struct shmem_inode_info *info = SHMEM_I(inode); @@ -1586,7 +1585,7 @@ static struct page *shmem_alloc_and_acct_page(gfp_t gfp, if (folio) { __folio_set_locked(folio); __folio_set_swapbacked(folio); - return &folio->page; + return folio; } err = -ENOMEM; @@ -1800,7 +1799,6 @@ static int shmem_getpage_gfp(struct inode *inode, pgoff_t index, struct shmem_sb_info *sbinfo; struct mm_struct *charge_mm; struct folio *folio; - struct page *page; pgoff_t hindex = index; gfp_t huge_gfp; int error; @@ -1818,19 +1816,18 @@ repeat: sbinfo = SHMEM_SB(inode->i_sb); charge_mm = vma ? vma->vm_mm : NULL; - page = pagecache_get_page(mapping, index, - FGP_ENTRY | FGP_HEAD | FGP_LOCK, 0); - - if (page && vma && userfaultfd_minor(vma)) { - if (!xa_is_value(page)) { - unlock_page(page); - put_page(page); + folio = __filemap_get_folio(mapping, index, FGP_ENTRY | FGP_LOCK, 0); + if (folio && vma && userfaultfd_minor(vma)) { + if (!xa_is_value(folio)) { + folio_unlock(folio); + folio_put(folio); } *fault_type = handle_userfault(vmf, VM_UFFD_MINOR); return 0; } - if (xa_is_value(page)) { + if (xa_is_value(folio)) { + struct page *page = &folio->page; error = shmem_swapin_page(inode, index, &page, sgp, gfp, vma, fault_type); if (error == -EEXIST) @@ -1840,17 +1837,17 @@ repeat: return error; } - if (page) { - hindex = page->index; + if (folio) { + hindex = folio->index; if (sgp == SGP_WRITE) - mark_page_accessed(page); - if (PageUptodate(page)) + folio_mark_accessed(folio); + if (folio_test_uptodate(folio)) goto out; /* fallocated page */ if (sgp != SGP_READ) goto clear; - unlock_page(page); - put_page(page); + folio_unlock(folio); + folio_put(folio); } /* @@ -1877,17 +1874,16 @@ repeat: huge_gfp = vma_thp_gfp_mask(vma); huge_gfp = limit_gfp_mask(huge_gfp, gfp); - page = shmem_alloc_and_acct_page(huge_gfp, inode, index, true); - if (IS_ERR(page)) { + folio = shmem_alloc_and_acct_folio(huge_gfp, inode, index, true); + if (IS_ERR(folio)) { alloc_nohuge: - page = shmem_alloc_and_acct_page(gfp, inode, - index, false); + folio = shmem_alloc_and_acct_folio(gfp, inode, index, false); } - if (IS_ERR(page)) { + if (IS_ERR(folio)) { int retry = 5; - error = PTR_ERR(page); - page = NULL; + error = PTR_ERR(folio); + folio = NULL; if (error != -ENOSPC) goto unlock; /* @@ -1906,30 +1902,26 @@ alloc_nohuge: goto unlock; } - if (PageTransHuge(page)) - hindex = round_down(index, HPAGE_PMD_NR); - else - hindex = index; + hindex = round_down(index, folio_nr_pages(folio)); if (sgp == SGP_WRITE) - __SetPageReferenced(page); + __folio_set_referenced(folio); - folio = page_folio(page); error = shmem_add_to_page_cache(folio, mapping, hindex, NULL, gfp & GFP_RECLAIM_MASK, charge_mm); if (error) goto unacct; - lru_cache_add(page); + folio_add_lru(folio); spin_lock_irq(&info->lock); - info->alloced += compound_nr(page); - inode->i_blocks += BLOCKS_PER_PAGE << compound_order(page); + info->alloced += folio_nr_pages(folio); + inode->i_blocks += BLOCKS_PER_PAGE << folio_order(folio); shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); alloced = true; - if (PageTransHuge(page) && + if (folio_test_pmd_mappable(folio) && DIV_ROUND_UP(i_size_read(inode), PAGE_SIZE) < hindex + HPAGE_PMD_NR - 1) { /* @@ -1960,22 +1952,21 @@ clear: * but SGP_FALLOC on a page fallocated earlier must initialize * it now, lest undo on failure cancel our earlier guarantee. */ - if (sgp != SGP_WRITE && !PageUptodate(page)) { - int i; + if (sgp != SGP_WRITE && !folio_test_uptodate(folio)) { + long i, n = folio_nr_pages(folio); - for (i = 0; i < compound_nr(page); i++) { - clear_highpage(page + i); - flush_dcache_page(page + i); - } - SetPageUptodate(page); + for (i = 0; i < n; i++) + clear_highpage(folio_page(folio, i)); + flush_dcache_folio(folio); + folio_mark_uptodate(folio); } /* Perhaps the file has been truncated since we checked */ if (sgp <= SGP_CACHE && ((loff_t)index << PAGE_SHIFT) >= i_size_read(inode)) { if (alloced) { - ClearPageDirty(page); - delete_from_page_cache(page); + folio_clear_dirty(folio); + filemap_remove_folio(folio); spin_lock_irq(&info->lock); shmem_recalc_inode(inode); spin_unlock_irq(&info->lock); @@ -1984,24 +1975,24 @@ clear: goto unlock; } out: - *pagep = page + index - hindex; + *pagep = folio_page(folio, index - hindex); return 0; /* * Error recovery. */ unacct: - shmem_inode_unacct_blocks(inode, compound_nr(page)); + shmem_inode_unacct_blocks(inode, folio_nr_pages(folio)); - if (PageTransHuge(page)) { - unlock_page(page); - put_page(page); + if (folio_test_large(folio)) { + folio_unlock(folio); + folio_put(folio); goto alloc_nohuge; } unlock: - if (page) { - unlock_page(page); - put_page(page); + if (folio) { + folio_unlock(folio); + folio_put(folio); } if (error == -ENOSPC && !once++) { spin_lock_irq(&info->lock); -- 2.39.5