buffer: remove folio_create_empty_buffers()

With all users converted, remove the old create_empty_buffers() and rename
folio_create_empty_buffers() to create_empty_buffers().

Link: https://lkml.kernel.org/r/20231016201114.1928083-28-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Pankaj Raghav <p.raghav@samsung.com>
Cc: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

fs/buffer.c

@@ -1641,7 +1641,7 @@ EXPORT_SYMBOL(block_invalidate_folio);
  * block_dirty_folio() via private_lock.  try_to_free_buffers
  * is already excluded via the folio lock.
  */
-struct buffer_head *folio_create_empty_buffers(struct folio *folio,
+struct buffer_head *create_empty_buffers(struct folio *folio,
 		unsigned long blocksize, unsigned long b_state)
 {
 	struct buffer_head *bh, *head, *tail;
@@ -1672,13 +1672,6 @@ struct buffer_head *folio_create_empty_buffers(struct folio *folio,
 
 	return head;
 }
-EXPORT_SYMBOL(folio_create_empty_buffers);
-
-void create_empty_buffers(struct page *page,
-			unsigned long blocksize, unsigned long b_state)
-{
-	folio_create_empty_buffers(page_folio(page), blocksize, b_state);
-}
 EXPORT_SYMBOL(create_empty_buffers);
 
 /**
@@ -1778,7 +1771,7 @@ static struct buffer_head *folio_create_buffers(struct folio *folio,
 
 	bh = folio_buffers(folio);
 	if (!bh)
-		bh = folio_create_empty_buffers(folio,
+		bh = create_empty_buffers(folio,
 				1 << READ_ONCE(inode->i_blkbits), b_state);
 	return bh;
 }
@@ -2681,7 +2674,7 @@ int block_truncate_page(struct address_space *mapping,
 
 	bh = folio_buffers(folio);
 	if (!bh)
-		bh = folio_create_empty_buffers(folio, blocksize, 0);
+		bh = create_empty_buffers(folio, blocksize, 0);
 
 	/* Find the buffer that contains "offset" */
 	offset = offset_in_folio(folio, from);

fs/ext4/inode.c

@@ -1021,7 +1021,7 @@ static int ext4_block_write_begin(struct folio *folio, loff_t pos, unsigned len,
 
 	head = folio_buffers(folio);
 	if (!head)
-		head = folio_create_empty_buffers(folio, blocksize, 0);
+		head = create_empty_buffers(folio, blocksize, 0);
 	bbits = ilog2(blocksize);
 	block = (sector_t)folio->index << (PAGE_SHIFT - bbits);
 
@@ -1151,7 +1151,7 @@ static int ext4_write_begin(struct file *file, struct address_space *mapping,
 	 * starting the handle.
 	 */
 	if (!folio_buffers(folio))
-		folio_create_empty_buffers(folio, inode->i_sb->s_blocksize, 0);
+		create_empty_buffers(folio, inode->i_sb->s_blocksize, 0);
 
 	folio_unlock(folio);
 
@@ -3642,7 +3642,7 @@ static int __ext4_block_zero_page_range(handle_t *handle,
 
 	bh = folio_buffers(folio);
 	if (!bh)
-		bh = folio_create_empty_buffers(folio, blocksize, 0);
+		bh = create_empty_buffers(folio, blocksize, 0);
 
 	/* Find the buffer that contains "offset" */
 	pos = blocksize;

fs/ext4/move_extent.c

@@ -184,7 +184,7 @@ mext_page_mkuptodate(struct folio *folio, unsigned from, unsigned to)
 	blocksize = i_blocksize(inode);
 	head = folio_buffers(folio);
 	if (!head)
-		head = folio_create_empty_buffers(folio, blocksize, 0);
+		head = create_empty_buffers(folio, blocksize, 0);
 
 	block = (sector_t)folio->index << (PAGE_SHIFT - inode->i_blkbits);
 	for (bh = head, block_start = 0; bh != head || !block_start;
@@ -380,7 +380,7 @@ move_extent_per_page(struct file *o_filp, struct inode *donor_inode,
 	 * but keeping in mind that i_size will not change */
 	bh = folio_buffers(folio[0]);
 	if (!bh)
-		bh = folio_create_empty_buffers(folio[0],
+		bh = create_empty_buffers(folio[0],
 				1 << orig_inode->i_blkbits, 0);
 	for (i = 0; i < data_offset_in_page; i++)
 		bh = bh->b_this_page;

fs/gfs2/aops.c

@@ -130,7 +130,7 @@ static int __gfs2_jdata_write_folio(struct folio *folio,
 	if (folio_test_checked(folio)) {
 		folio_clear_checked(folio);
 		if (!folio_buffers(folio)) {
-			folio_create_empty_buffers(folio,
+			create_empty_buffers(folio,
 					inode->i_sb->s_blocksize,
 					BIT(BH_Dirty)|BIT(BH_Uptodate));
 		}

fs/gfs2/bmap.c

@@ -71,7 +71,7 @@ static int gfs2_unstuffer_folio(struct gfs2_inode *ip, struct buffer_head *dibh,
 		struct buffer_head *bh = folio_buffers(folio);
 
 		if (!bh)
-			bh = folio_create_empty_buffers(folio,
+			bh = create_empty_buffers(folio,
 				BIT(inode->i_blkbits), BIT(BH_Uptodate));
 
 		if (!buffer_mapped(bh))

fs/gfs2/meta_io.c

@@ -134,7 +134,7 @@ struct buffer_head *gfs2_getbuf(struct gfs2_glock *gl, u64 blkno, int create)
 				mapping_gfp_mask(mapping) | __GFP_NOFAIL);
 		bh = folio_buffers(folio);
 		if (!bh)
-			bh = folio_create_empty_buffers(folio,
+			bh = create_empty_buffers(folio,
 				sdp->sd_sb.sb_bsize, 0);
 	} else {
 		folio = __filemap_get_folio(mapping, index,

fs/gfs2/quota.c

@@ -763,7 +763,7 @@ static int gfs2_write_buf_to_page(struct gfs2_sbd *sdp, unsigned long index,
 		return PTR_ERR(folio);
 	bh = folio_buffers(folio);
 	if (!bh)
-		bh = folio_create_empty_buffers(folio, bsize, 0);
+		bh = create_empty_buffers(folio, bsize, 0);
 
 	for (;;) {
 		/* Find the beginning block within the folio */

fs/mpage.c

@@ -119,7 +119,7 @@ static void map_buffer_to_folio(struct folio *folio, struct buffer_head *bh,
 			folio_mark_uptodate(folio);
 			return;
 		}
-		head = folio_create_empty_buffers(folio, i_blocksize(inode), 0);
+		head = create_empty_buffers(folio, i_blocksize(inode), 0);
 	}
 
 	page_bh = head;

fs/nilfs2/mdt.c

@@ -568,7 +568,7 @@ int nilfs_mdt_freeze_buffer(struct inode *inode, struct buffer_head *bh)
 
 	bh_frozen = folio_buffers(folio);
 	if (!bh_frozen)
-		bh_frozen = folio_create_empty_buffers(folio, 1 << blkbits, 0);
+		bh_frozen = create_empty_buffers(folio, 1 << blkbits, 0);
 
 	bh_frozen = get_nth_bh(bh_frozen, bh_offset(bh) >> blkbits);
 

fs/nilfs2/page.c

@@ -34,7 +34,7 @@ static struct buffer_head *__nilfs_get_folio_block(struct folio *folio,
 	struct buffer_head *bh = folio_buffers(folio);
 
 	if (!bh)
-		bh = folio_create_empty_buffers(folio, 1 << blkbits, b_state);
+		bh = create_empty_buffers(folio, 1 << blkbits, b_state);
 
 	first_block = (unsigned long)index << (PAGE_SHIFT - blkbits);
 	bh = get_nth_bh(bh, block - first_block);
@@ -204,7 +204,7 @@ static void nilfs_copy_folio(struct folio *dst, struct folio *src,
 	sbh = folio_buffers(src);
 	dbh = folio_buffers(dst);
 	if (!dbh)
-		dbh = folio_create_empty_buffers(dst, sbh->b_size, 0);
+		dbh = create_empty_buffers(dst, sbh->b_size, 0);
 
 	if (copy_dirty)
 		mask |= BIT(BH_Dirty);

fs/nilfs2/segment.c

@@ -732,7 +732,7 @@ static size_t nilfs_lookup_dirty_data_buffers(struct inode *inode,
 		}
 		head = folio_buffers(folio);
 		if (!head)
-			head = folio_create_empty_buffers(folio,
+			head = create_empty_buffers(folio,
 					i_blocksize(inode), 0);
 		folio_unlock(folio);
 

fs/ntfs/aops.c

@@ -189,7 +189,7 @@ static int ntfs_read_block(struct folio *folio)
 
 	head = folio_buffers(folio);
 	if (!head)
-		head = folio_create_empty_buffers(folio, blocksize, 0);
+		head = create_empty_buffers(folio, blocksize, 0);
 	bh = head;
 
 	/*
@@ -555,7 +555,7 @@ static int ntfs_write_block(struct folio *folio, struct writeback_control *wbc)
 	head = folio_buffers(folio);
 	if (!head) {
 		BUG_ON(!folio_test_uptodate(folio));
-		head = folio_create_empty_buffers(folio, blocksize,
+		head = create_empty_buffers(folio, blocksize,
 				(1 << BH_Uptodate) | (1 << BH_Dirty));
 	}
 	bh = head;

fs/ntfs/file.c

@@ -625,7 +625,7 @@ static int ntfs_prepare_pages_for_non_resident_write(struct page **pages,
 		 * create_empty_buffers() will create uptodate/dirty
 		 * buffers if the folio is uptodate/dirty.
 		 */
-		head = folio_create_empty_buffers(folio, blocksize, 0);
+		head = create_empty_buffers(folio, blocksize, 0);
 	bh = head;
 	do {
 		VCN cdelta;

fs/ntfs3/file.c

@@ -203,7 +203,7 @@ static int ntfs_zero_range(struct inode *inode, u64 vbo, u64 vbo_to)
 
 		head = folio_buffers(folio);
 		if (!head)
-			head = folio_create_empty_buffers(folio, blocksize, 0);
+			head = create_empty_buffers(folio, blocksize, 0);
 
 		bh = head;
 		bh_off = 0;

fs/ocfs2/aops.c

@@ -601,7 +601,7 @@ int ocfs2_map_page_blocks(struct page *page, u64 *p_blkno,
 
 	head = folio_buffers(folio);
 	if (!head)
-		head = folio_create_empty_buffers(folio, bsize, 0);
+		head = create_empty_buffers(folio, bsize, 0);
 
 	for (bh = head, block_start = 0; bh != head || !block_start;
 	     bh = bh->b_this_page, block_start += bsize) {

fs/reiserfs/inode.c

@@ -2539,7 +2539,7 @@ static int reiserfs_write_full_folio(struct folio *folio,
 	 */
 	head = folio_buffers(folio);
 	if (!head)
-		head = folio_create_empty_buffers(folio, s->s_blocksize,
+		head = create_empty_buffers(folio, s->s_blocksize,
 				     (1 << BH_Dirty) | (1 << BH_Uptodate));
 
 	/*

fs/ufs/util.c

@@ -264,6 +264,6 @@ struct folio *ufs_get_locked_folio(struct address_space *mapping,
 		}
 	}
 	if (!folio_buffers(folio))
-		folio_create_empty_buffers(folio, 1 << inode->i_blkbits, 0);
+		create_empty_buffers(folio, 1 << inode->i_blkbits, 0);
 	return folio;
 }

include/linux/buffer_head.h

@@ -201,9 +201,7 @@ struct buffer_head *folio_alloc_buffers(struct folio *folio, unsigned long size,
 					gfp_t gfp);
 struct buffer_head *alloc_page_buffers(struct page *page, unsigned long size,
 		bool retry);
-void create_empty_buffers(struct page *, unsigned long,
-			unsigned long b_state);
-struct buffer_head *folio_create_empty_buffers(struct folio *folio,
+struct buffer_head *create_empty_buffers(struct folio *folio,
 		unsigned long blocksize, unsigned long b_state);
 void end_buffer_read_sync(struct buffer_head *bh, int uptodate);
 void end_buffer_write_sync(struct buffer_head *bh, int uptodate);