+ ext4-call-bdev_getblk-from-sb_getblk_gfp.patch added to mm-unstable branch

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

The patch titled
     Subject: ext4: call bdev_getblk() from sb_getblk_gfp()
has been added to the -mm mm-unstable branch.  Its filename is
     ext4-call-bdev_getblk-from-sb_getblk_gfp.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/ext4-call-bdev_getblk-from-sb_getblk_gfp.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: ext4: call bdev_getblk() from sb_getblk_gfp()
Date: Thu, 14 Sep 2023 16:00:10 +0100

Most of the callers of sb_getblk_gfp() already assumed that they were
passing the entire GFP flags to use.  Fix up the two callers that didn't,
and remove the __GFP_NOFAIL from them since they both appear to correctly
handle failure.

Link: https://lkml.kernel.org/r/20230914150011.843330-8-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Hui Zhu <teawater@antgroup.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 fs/ext4/super.c             |   10 ++++++++--
 include/linux/buffer_head.h |    6 +++---
 2 files changed, 11 insertions(+), 5 deletions(-)

--- a/fs/ext4/super.c~ext4-call-bdev_getblk-from-sb_getblk_gfp
+++ a/fs/ext4/super.c
@@ -244,13 +244,19 @@ static struct buffer_head *__ext4_sb_bre
 struct buffer_head *ext4_sb_bread(struct super_block *sb, sector_t block,
 				   blk_opf_t op_flags)
 {
-	return __ext4_sb_bread_gfp(sb, block, op_flags, __GFP_MOVABLE);
+	gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_inode->i_mapping,
+			~__GFP_FS) | __GFP_MOVABLE;
+
+	return __ext4_sb_bread_gfp(sb, block, op_flags, gfp);
 }
 
 struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
 					    sector_t block)
 {
-	return __ext4_sb_bread_gfp(sb, block, 0, 0);
+	gfp_t gfp = mapping_gfp_constraint(sb->s_bdev->bd_inode->i_mapping,
+			~__GFP_FS);
+
+	return __ext4_sb_bread_gfp(sb, block, 0, gfp);
 }
 
 void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block)
--- a/include/linux/buffer_head.h~ext4-call-bdev_getblk-from-sb_getblk_gfp
+++ a/include/linux/buffer_head.h
@@ -365,10 +365,10 @@ static inline struct buffer_head *sb_get
 	return __getblk(sb->s_bdev, block, sb->s_blocksize);
 }
 
-static inline struct buffer_head *
-sb_getblk_gfp(struct super_block *sb, sector_t block, gfp_t gfp)
+static inline struct buffer_head *sb_getblk_gfp(struct super_block *sb,
+		sector_t block, gfp_t gfp)
 {
-	return __getblk_gfp(sb->s_bdev, block, sb->s_blocksize, gfp);
+	return bdev_getblk(sb->s_bdev, block, sb->s_blocksize, gfp);
 }
 
 static inline struct buffer_head *
_

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

mm-convert-dax-lock-unlock-page-to-lock-unlock-folio.patch
buffer-pass-gfp-flags-to-folio_alloc_buffers.patch
buffer-hoist-gfp-flags-from-grow_dev_page-to-__getblk_gfp.patch
ext4-use-bdev_getblk-to-avoid-memory-reclaim-in-readahead-path.patch
buffer-use-bdev_getblk-to-avoid-memory-reclaim-in-readahead-path.patch
buffer-convert-getblk_unmovable-and-__getblk-to-use-bdev_getblk.patch
buffer-convert-sb_getblk-to-call-__getblk.patch
ext4-call-bdev_getblk-from-sb_getblk_gfp.patch
buffer-remove-__getblk_gfp.patch