+ fs-buffer-convert-create_page_buffers-to-folio_create_buffers.patch added to mm-unstable branch

[Andrew Morton <akpm@linux-foundation.org>]

The patch titled
     Subject: fs/buffer: convert create_page_buffers to folio_create_buffers
has been added to the -mm mm-unstable branch.  Its filename is
     fs-buffer-convert-create_page_buffers-to-folio_create_buffers.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/fs-buffer-convert-create_page_buffers-to-folio_create_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: Pankaj Raghav <p.raghav@samsung.com>
Subject: fs/buffer: convert create_page_buffers to folio_create_buffers
Date: Mon, 17 Apr 2023 14:36:18 +0200

fs/buffer do not support large folios as there are many assumptions on the
folio size to be the host page size.  This conversion is one step towards
removing that assumption.  Also this conversion will reduce calls to
compound_head() if folio_create_buffers() calls
folio_create_empty_buffers().

Link: https://lkml.kernel.org/r/20230417123618.22094-5-p.raghav@samsung.com
Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Reviewed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/buffer.c |   23 +++++++++++++----------
 1 file changed, 13 insertions(+), 10 deletions(-)

--- a/fs/buffer.c~fs-buffer-convert-create_page_buffers-to-folio_create_buffers
+++ a/fs/buffer.c
@@ -1723,14 +1723,17 @@ static inline int block_size_bits(unsign
 	return ilog2(blocksize);
 }
 
-static struct buffer_head *create_page_buffers(struct page *page, struct inode *inode, unsigned int b_state)
+static struct buffer_head *folio_create_buffers(struct folio *folio,
+						struct inode *inode,
+						unsigned int b_state)
 {
-	BUG_ON(!PageLocked(page));
+	BUG_ON(!folio_test_locked(folio));
 
-	if (!page_has_buffers(page))
-		create_empty_buffers(page, 1 << READ_ONCE(inode->i_blkbits),
-				     b_state);
-	return page_buffers(page);
+	if (!folio_buffers(folio))
+		folio_create_empty_buffers(folio,
+					   1 << READ_ONCE(inode->i_blkbits),
+					   b_state);
+	return folio_buffers(folio);
 }
 
 /*
@@ -1774,8 +1777,8 @@ int __block_write_full_page(struct inode
 	int nr_underway = 0;
 	blk_opf_t write_flags = wbc_to_write_flags(wbc);
 
-	head = create_page_buffers(page, inode,
-					(1 << BH_Dirty)|(1 << BH_Uptodate));
+	head = folio_create_buffers(page_folio(page), inode,
+				    (1 << BH_Dirty) | (1 << BH_Uptodate));
 
 	/*
 	 * Be very careful.  We have no exclusion from block_dirty_folio
@@ -2038,7 +2041,7 @@ int __block_write_begin_int(struct folio
 	BUG_ON(to > PAGE_SIZE);
 	BUG_ON(from > to);
 
-	head = create_page_buffers(&folio->page, inode, 0);
+	head = folio_create_buffers(folio, inode, 0);
 	blocksize = head->b_size;
 	bbits = block_size_bits(blocksize);
 
@@ -2324,7 +2327,7 @@ int block_read_full_folio(struct folio *
 
 	VM_BUG_ON_FOLIO(folio_test_large(folio), folio);
 
-	head = create_page_buffers(&folio->page, inode, 0);
+	head = folio_create_buffers(folio, inode, 0);
 	blocksize = head->b_size;
 	bbits = block_size_bits(blocksize);
 
_

Patches currently in -mm which might be from p.raghav@samsung.com are

orangefs-use-folios-in-orangefs_readahead.patch
mpage-split-submit_bio-and-bio-end_io-handler-for-reads-and-writes.patch
mpage-use-folios-in-bio-end_io-handler.patch
fs-buffer-add-folio_set_bh-helper.patch
buffer-add-folio_alloc_buffers-helper.patch
fs-buffer-add-folio_create_empty_buffers-helper.patch
fs-buffer-convert-create_page_buffers-to-folio_create_buffers.patch