buffer: convert getblk_unmovable() and __getblk() to use bdev_getblk()

mainline inclusion
from mainline-v6.7-rc1
category: bugfix

Move these two functions up in the file for the benefit of the next patch,
and pass in all of the GFP flags to use instead of the partial GFP flags
used by __getblk_gfp().

Link: https://lkml.kernel.org/r/20230914150011.843330-6-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>
(cherry picked from commit c645e65)
Signed-off-by: Wentao Guan <guanwentao@uniontech.com>

Author: Matthew Wilcox (Oracle)

include/linux/buffer_head.h

@@ -340,6 +340,28 @@ sb_breadahead(struct super_block *sb, sector_t block)
 	__breadahead(sb->s_bdev, block, sb->s_blocksize);
 }
 
+static inline struct buffer_head *getblk_unmovable(struct block_device *bdev,
+		sector_t block, unsigned size)
+{
+	gfp_t gfp;
+
+	gfp = mapping_gfp_constraint(bdev->bd_inode->i_mapping, ~__GFP_FS);
+	gfp |= __GFP_NOFAIL;
+
+	return bdev_getblk(bdev, block, size, gfp);
+}
+
+static inline struct buffer_head *__getblk(struct block_device *bdev,
+		sector_t block, unsigned size)
+{
+	gfp_t gfp;
+
+	gfp = mapping_gfp_constraint(bdev->bd_inode->i_mapping, ~__GFP_FS);
+	gfp |= __GFP_MOVABLE | __GFP_NOFAIL;
+
+	return bdev_getblk(bdev, block, size, gfp);
+}
+
 static inline struct buffer_head *
 sb_getblk(struct super_block *sb, sector_t block)
 {
@@ -387,20 +409,6 @@ static inline void lock_buffer(struct buffer_head *bh)
 		__lock_buffer(bh);
 }
 
-static inline struct buffer_head *getblk_unmovable(struct block_device *bdev,
-						   sector_t block,
-						   unsigned size)
-{
-	return __getblk_gfp(bdev, block, size, 0);
-}
-
-static inline struct buffer_head *__getblk(struct block_device *bdev,
-					   sector_t block,
-					   unsigned size)
-{
-	return __getblk_gfp(bdev, block, size, __GFP_MOVABLE);
-}
-
 static inline void bh_readahead(struct buffer_head *bh, blk_opf_t op_flags)
 {
 	if (!buffer_uptodate(bh) && trylock_buffer(bh)) {