+ nilfs2-convert-nilfs_page_mkwrite-to-use-a-folio.patch added to mm-nonmm-unstable branch

+ nilfs2-convert-nilfs_page_mkwrite-to-use-a-folio.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: nilfs2: convert nilfs_page_mkwrite() to use a folio
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     nilfs2-convert-nilfs_page_mkwrite-to-use-a-folio.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/nilfs2-convert-nilfs_page_mkwrite-to-use-a-folio.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Subject: nilfs2: convert nilfs_page_mkwrite() to use a folio
Date: Tue, 14 Nov 2023 17:44:27 +0900

Using the new folio APIs saves seven hidden calls to compound_head().

Link: https://lkml.kernel.org/r/20231114084436.2755-12-konishi.ryusuke@gmail.com
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/nilfs2/file.c |   28 +++++++++++++++-------------
 1 file changed, 15 insertions(+), 13 deletions(-)

--- a/fs/nilfs2/file.c~nilfs2-convert-nilfs_page_mkwrite-to-use-a-folio
+++ a/fs/nilfs2/file.c
@@ -45,34 +45,36 @@ int nilfs_sync_file(struct file *file, l
 static vm_fault_t nilfs_page_mkwrite(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
-	struct page *page = vmf->page;
+	struct folio *folio = page_folio(vmf->page);
 	struct inode *inode = file_inode(vma->vm_file);
 	struct nilfs_transaction_info ti;
+	struct buffer_head *bh, *head;
 	int ret = 0;
 
 	if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info)))
 		return VM_FAULT_SIGBUS; /* -ENOSPC */
 
 	sb_start_pagefault(inode->i_sb);
-	lock_page(page);
-	if (page->mapping != inode->i_mapping ||
-	    page_offset(page) >= i_size_read(inode) || !PageUptodate(page)) {
-		unlock_page(page);
+	folio_lock(folio);
+	if (folio->mapping != inode->i_mapping ||
+	    folio_pos(folio) >= i_size_read(inode) ||
+	    !folio_test_uptodate(folio)) {
+		folio_unlock(folio);
 		ret = -EFAULT;	/* make the VM retry the fault */
 		goto out;
 	}
 
 	/*
-	 * check to see if the page is mapped already (no holes)
+	 * check to see if the folio is mapped already (no holes)
 	 */
-	if (PageMappedToDisk(page))
+	if (folio_test_mappedtodisk(folio))
 		goto mapped;
 
-	if (page_has_buffers(page)) {
-		struct buffer_head *bh, *head;
+	head = folio_buffers(folio);
+	if (head) {
 		int fully_mapped = 1;
 
-		bh = head = page_buffers(page);
+		bh = head;
 		do {
 			if (!buffer_mapped(bh)) {
 				fully_mapped = 0;
@@ -81,11 +83,11 @@ static vm_fault_t nilfs_page_mkwrite(str
 		} while (bh = bh->b_this_page, bh != head);
 
 		if (fully_mapped) {
-			SetPageMappedToDisk(page);
+			folio_set_mappedtodisk(folio);
 			goto mapped;
 		}
 	}
-	unlock_page(page);
+	folio_unlock(folio);
 
 	/*
 	 * fill hole blocks
@@ -105,7 +107,7 @@ static vm_fault_t nilfs_page_mkwrite(str
 	nilfs_transaction_commit(inode->i_sb);
 
  mapped:
-	wait_for_stable_page(page);
+	folio_wait_stable(folio);
  out:
 	sb_end_pagefault(inode->i_sb);
 	return vmf_fs_error(ret);
_

Patches currently in -mm which might be from willy@infradead.org are

mm-add-folio_zero_tail-and-use-it-in-ext4.patch
mm-add-folio_fill_tail-and-use-it-in-iomap.patch
gfs2-convert-stuffed_readpage-to-stuffed_read_folio.patch
mm-remove-test_set_page_writeback.patch
afs-do-not-test-the-return-value-of-folio_start_writeback.patch
smb-do-not-test-the-return-value-of-folio_start_writeback.patch
mm-return-void-from-folio_start_writeback-and-related-functions.patch
mm-make-mapping_evict_folio-the-preferred-way-to-evict-clean-folios.patch
mm-convert-__do_fault-to-use-a-folio.patch
mm-use-mapping_evict_folio-in-truncate_error_page.patch
mm-convert-soft_offline_in_use_page-to-use-a-folio.patch
mm-convert-isolate_page-to-mf_isolate_folio.patch
mm-remove-invalidate_inode_page.patch
buffer-return-bool-from-grow_dev_folio.patch
buffer-calculate-block-number-inside-folio_init_buffers.patch
buffer-fix-grow_buffers-for-block-size-page_size.patch
buffer-cast-block-to-loff_t-before-shifting-it.patch
buffer-fix-various-functions-for-block-size-page_size.patch
buffer-handle-large-folios-in-__block_write_begin_int.patch
buffer-fix-more-functions-for-block-size-page_size.patch
gfp-include-__gfp_nowarn-in-gfp_nowait.patch
nilfs2-add-nilfs_end_folio_io.patch
nilfs2-convert-nilfs_abort_logs-to-use-folios.patch
nilfs2-convert-nilfs_segctor_complete_write-to-use-folios.patch
nilfs2-convert-nilfs_forget_buffer-to-use-a-folio.patch
nilfs2-convert-to-nilfs_folio_buffers_clean.patch
nilfs2-convert-nilfs_writepage-to-use-a-folio.patch
nilfs2-convert-nilfs_mdt_write_page-to-use-a-folio.patch
nilfs2-convert-to-nilfs_clear_folio_dirty.patch
nilfs2-convert-to-__nilfs_clear_folio_dirty.patch
nilfs2-convert-nilfs_segctor_prepare_write-to-use-folios.patch
nilfs2-convert-nilfs_page_mkwrite-to-use-a-folio.patch
nilfs2-convert-nilfs_mdt_create_block-to-use-a-folio.patch
nilfs2-convert-nilfs_mdt_submit_block-to-use-a-folio.patch
nilfs2-convert-nilfs_gccache_submit_read_data-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_create_block-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_submit_block-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_delete-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_prepare_change_key-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_commit_change_key-to-use-a-folio.patch
nilfs2-convert-nilfs_btnode_abort_change_key-to-use-a-folio.patch