+ buffer-replace-obvious-uses-of-b_page-with-b_folio.patch added to mm-unstable branch

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

The patch titled
     Subject: buffer: replace obvious uses of b_page with b_folio
has been added to the -mm mm-unstable branch.  Its filename is
     buffer-replace-obvious-uses-of-b_page-with-b_folio.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/buffer-replace-obvious-uses-of-b_page-with-b_folio.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: replace obvious uses of b_page with b_folio
Date: Thu, 15 Dec 2022 21:43:52 +0000

These cases just check if it's NULL, or use b_page to get to the page's
address space.  They are assumptions that b_page never points to a tail
page.

Link: https://lkml.kernel.org/r/20221215214402.3522366-3-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/buffer.c |   12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

--- a/fs/buffer.c~buffer-replace-obvious-uses-of-b_page-with-b_folio
+++ a/fs/buffer.c
@@ -321,7 +321,7 @@ static void end_buffer_async_read_io(str
 {
 	/* Decrypt if needed */
 	if (uptodate &&
-	    fscrypt_inode_uses_fs_layer_crypto(bh->b_page->mapping->host)) {
+	    fscrypt_inode_uses_fs_layer_crypto(bh->b_folio->mapping->host)) {
 		struct decrypt_bh_ctx *ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
 
 		if (ctx) {
@@ -570,7 +570,7 @@ void write_boundary_block(struct block_d
 void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode)
 {
 	struct address_space *mapping = inode->i_mapping;
-	struct address_space *buffer_mapping = bh->b_page->mapping;
+	struct address_space *buffer_mapping = bh->b_folio->mapping;
 
 	mark_buffer_dirty(bh);
 	if (!mapping->private_data) {
@@ -1073,7 +1073,7 @@ __getblk_slow(struct block_device *bdev,
  * and then attach the address_space's inode to its superblock's dirty
  * inode list.
  *
- * mark_buffer_dirty() is atomic.  It takes bh->b_page->mapping->private_lock,
+ * mark_buffer_dirty() is atomic.  It takes bh->b_folio->mapping->private_lock,
  * i_pages lock and mapping->host->i_lock.
  */
 void mark_buffer_dirty(struct buffer_head *bh)
@@ -1117,8 +1117,8 @@ void mark_buffer_write_io_error(struct b
 
 	set_buffer_write_io_error(bh);
 	/* FIXME: do we need to set this in both places? */
-	if (bh->b_page && bh->b_page->mapping)
-		mapping_set_error(bh->b_page->mapping, -EIO);
+	if (bh->b_folio && bh->b_folio->mapping)
+		mapping_set_error(bh->b_folio->mapping, -EIO);
 	if (bh->b_assoc_map)
 		mapping_set_error(bh->b_assoc_map, -EIO);
 	rcu_read_lock();
@@ -1154,7 +1154,7 @@ void __bforget(struct buffer_head *bh)
 {
 	clear_buffer_dirty(bh);
 	if (bh->b_assoc_map) {
-		struct address_space *buffer_mapping = bh->b_page->mapping;
+		struct address_space *buffer_mapping = bh->b_folio->mapping;
 
 		spin_lock(&buffer_mapping->private_lock);
 		list_del_init(&bh->b_assoc_buffers);
_

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

buffer-add-b_folio-as-an-alias-of-b_page.patch
buffer-replace-obvious-uses-of-b_page-with-b_folio.patch
buffer-use-b_folio-in-touch_buffer.patch
buffer-use-b_folio-in-end_buffer_async_read.patch
buffer-use-b_folio-in-end_buffer_async_write.patch
page_io-remove-buffer_head-include.patch
buffer-use-b_folio-in-mark_buffer_dirty.patch
gfs2-replace-obvious-uses-of-b_page-with-b_folio.patch
jbd2-replace-obvious-uses-of-b_page-with-b_folio.patch
nilfs2-replace-obvious-uses-of-b_page-with-b_folio.patch
reiserfs-replace-obvious-uses-of-b_page-with-b_folio.patch
mpage-use-b_folio-in-do_mpage_readpage.patch