+ buffer-convert-init_page_buffers-to-folio_init_buffers.patch added to mm-unstable branch

+ buffer-convert-init_page_buffers-to-folio_init_buffers.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: buffer: convert init_page_buffers() to folio_init_buffers()
has been added to the -mm mm-unstable branch.  Its filename is
     buffer-convert-init_page_buffers-to-folio_init_buffers.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/buffer-convert-init_page_buffers-to-folio_init_buffers.patch

This patch will later appear in the mm-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: buffer: convert init_page_buffers() to folio_init_buffers()
Date: Mon, 12 Jun 2023 22:01:38 +0100

Use the folio API and pass the folio from both callers.  Saves a hidden
call to compound_head().

Link: https://lkml.kernel.org/r/20230612210141.730128-12-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Bob Peterson <rpeterso@redhat.com>
Cc: Hannes Reinecke <hare@suse.com>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/buffer.c |   18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

--- a/fs/buffer.c~buffer-convert-init_page_buffers-to-folio_init_buffers
+++ a/fs/buffer.c
@@ -934,15 +934,14 @@ static sector_t blkdev_max_block(struct
 }
 
 /*
- * Initialise the state of a blockdev page's buffers.
+ * Initialise the state of a blockdev folio's buffers.
  */ 
-static sector_t
-init_page_buffers(struct page *page, struct block_device *bdev,
-			sector_t block, int size)
+static sector_t folio_init_buffers(struct folio *folio,
+		struct block_device *bdev, sector_t block, int size)
 {
-	struct buffer_head *head = page_buffers(page);
+	struct buffer_head *head = folio_buffers(folio);
 	struct buffer_head *bh = head;
-	int uptodate = PageUptodate(page);
+	bool uptodate = folio_test_uptodate(folio);
 	sector_t end_block = blkdev_max_block(bdev, size);
 
 	do {
@@ -998,9 +997,8 @@ grow_dev_page(struct block_device *bdev,
 	bh = folio_buffers(folio);
 	if (bh) {
 		if (bh->b_size == size) {
-			end_block = init_page_buffers(&folio->page, bdev,
-						(sector_t)index << sizebits,
-						size);
+			end_block = folio_init_buffers(folio, bdev,
+					(sector_t)index << sizebits, size);
 			goto done;
 		}
 		if (!try_to_free_buffers(folio))
@@ -1016,7 +1014,7 @@ grow_dev_page(struct block_device *bdev,
 	 */
 	spin_lock(&inode->i_mapping->private_lock);
 	link_dev_buffers(&folio->page, bh);
-	end_block = init_page_buffers(&folio->page, bdev,
+	end_block = folio_init_buffers(folio, bdev,
 			(sector_t)index << sizebits, size);
 	spin_unlock(&inode->i_mapping->private_lock);
 done:
_

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

gfs2-use-a-folio-inside-gfs2_jdata_writepage.patch
gfs2-pass-a-folio-to-__gfs2_jdata_write_folio.patch
gfs2-convert-gfs2_write_jdata_page-to-gfs2_write_jdata_folio.patch
buffer-convert-__block_write_full_page-to-__block_write_full_folio.patch
gfs2-support-ludicrously-large-folios-in-gfs2_trans_add_databufs.patch
buffer-make-block_write_full_page-handle-large-folios-correctly.patch
buffer-convert-block_page_mkwrite-to-use-a-folio.patch
buffer-convert-__block_commit_write-to-take-a-folio.patch
buffer-convert-page_zero_new_buffers-to-folio_zero_new_buffers.patch
buffer-convert-grow_dev_page-to-use-a-folio.patch
buffer-convert-init_page_buffers-to-folio_init_buffers.patch
buffer-convert-link_dev_buffers-to-take-a-folio.patch
buffer-use-a-folio-in-__find_get_block_slow.patch
buffer-convert-block_truncate_page-to-use-a-folio.patch