Subject: linux-next: build failure after merge of the folio tree

From: Stephen Rothwell <[email-masked]>
Date: Mon, 2 May 2022 18:04:25 +1000

Hi all,

After merging the folio tree, today's linux-next build (x86_64
allmodconfig) failed like this:

fs/erofs/fscache.c:255:10: error: 'const struct address_space_operations' has no member named 'readpage'
  255 |         .readpage = erofs_fscache_meta_readpage,
      |          ^~~~~~~~
fs/erofs/fscache.c:255:21: error: initialization of 'int (*)(struct page *, struct writeback_control *)' from incompatible pointer type 'int (*)(struct file *, struct page *)' [-Werror=incompatible-pointer-types]
  255 |         .readpage = erofs_fscache_meta_readpage,
      |                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~
fs/erofs/fscache.c:255:21: note: (near initialization for 'erofs_fscache_meta_aops.writepage')
fs/erofs/fscache.c:259:10: error: 'const struct address_space_operations' has no member named 'readpage'
  259 |         .readpage = erofs_fscache_readpage,
      |          ^~~~~~~~
fs/erofs/fscache.c:259:21: error: initialization of 'int (*)(struct page *, struct writeback_control *)' from incompatible pointer type 'int (*)(struct file *, struct page *)' [-Werror=incompatible-pointer-types]
  259 |         .readpage = erofs_fscache_readpage,
      |                     ^~~~~~~~~~~~~~~~~~~~~~
fs/erofs/fscache.c:259:21: note: (near initialization for 'erofs_fscache_access_aops.writepage')

Caused by commit

  00da6d4b7219 ("mm,fs: Remove stray references to ->readpage")

interacting with commits

  60aa7e805f00 ("erofs: implement fscache-based metadata read")
  e472f468adbe ("erofs: implement fscache-based data read for non-inline layout")

from the erofs tree.

I have applied the following merge fix patch.

From: Stephen Rothwell <[email-masked]>
Date: Mon, 2 May 2022 17:57:39 +1000
Subject: [PATCH] fixup for "mm,fs: Remove stray references to ->readpage"

interacting with commits

  60aa7e805f00 ("erofs: implement fscache-based metadata read")
  e472f468adbe ("erofs: implement fscache-based data read for non-inline layout")

Signed-off-by: Stephen Rothwell <[email-masked]>
---
 fs/erofs/fscache.c | 10 ++++------
 1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/fs/erofs/fscache.c b/fs/erofs/fscache.c
index a402d8f0a063..1bb2d0fc19c8 100644
--- a/fs/erofs/fscache.c
+++ b/fs/erofs/fscache.c
@@ -59,10 +59,9 @@ static int erofs_fscache_read_folios(struct fscache_cookie *cookie,
 	return ret;
 }
 
-static int erofs_fscache_meta_readpage(struct file *data, struct page *page)
+static int erofs_fscache_meta_read_folio(struct file *data, struct folio *folio)
 {
 	int ret;
-	struct folio *folio = page_folio(page);
 	struct super_block *sb = folio_mapping(folio)->host->i_sb;
 	struct erofs_map_dev mdev = {
 		.m_deviceid = 0,
@@ -110,9 +109,8 @@ static int erofs_fscache_readpage_inline(struct folio *folio,
 	return 0;
 }
 
-static int erofs_fscache_readpage(struct file *file, struct page *page)
+static int erofs_fscache_read_folio(struct file *file, struct folio *folio)
 {
-	struct folio *folio = page_folio(page);
 	struct inode *inode = folio_mapping(folio)->host;
 	struct super_block *sb = inode->i_sb;
 	struct erofs_map_blocks map;
@@ -252,11 +250,11 @@ static void erofs_fscache_readahead(struct readahead_control *rac)
 }
 
 static const struct address_space_operations erofs_fscache_meta_aops = {
-	.readpage = erofs_fscache_meta_readpage,
+	.read_folio = erofs_fscache_meta_read_folio,
 };
 
 const struct address_space_operations erofs_fscache_access_aops = {
-	.readpage = erofs_fscache_readpage,
+	.read_folio = erofs_fscache_read_folio,
 	.readahead = erofs_fscache_readahead,
 };
 
-- 
2.35.1

-- 
Cheers,
Stephen Rothwell