[PATCH 21/41] fs: Stop using i_private_data for metadata bh tracking

[Jan Kara <jack@suse.cz>]

All filesystem using generic metadata bh tracking are using bdev mapping
as a backing for these bhs. Stop using i_private_data for it and get to
bdev mapping directly.

Signed-off-by: Jan Kara <jack@suse.cz>
---
 fs/buffer.c | 13 +++++--------
 1 file changed, 5 insertions(+), 8 deletions(-)

diff --git a/fs/buffer.c b/fs/buffer.c
index bd48644e1bf8..c85ccfb1a4ec 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -574,9 +574,10 @@ static int osync_buffers_list(spinlock_t *lock, struct list_head *list)
  */
 int sync_mapping_buffers(struct address_space *mapping)
 {
-	struct address_space *buffer_mapping = mapping->i_private_data;
+	struct address_space *buffer_mapping =
+				mapping->host->i_sb->s_bdev->bd_mapping;
 
-	if (buffer_mapping == NULL || list_empty(&mapping->i_private_list))
+	if (list_empty(&mapping->i_private_list))
 		return 0;
 
 	return fsync_buffers_list(&buffer_mapping->i_private_lock,
@@ -679,11 +680,6 @@ void mark_buffer_dirty_inode(struct buffer_head *bh, struct inode *inode)
 	struct address_space *buffer_mapping = bh->b_folio->mapping;
 
 	mark_buffer_dirty(bh);
-	if (!mapping->i_private_data) {
-		mapping->i_private_data = buffer_mapping;
-	} else {
-		BUG_ON(mapping->i_private_data != buffer_mapping);
-	}
 	if (!bh->b_assoc_map) {
 		spin_lock(&buffer_mapping->i_private_lock);
 		list_move_tail(&bh->b_assoc_buffers,
@@ -868,7 +864,8 @@ void invalidate_inode_buffers(struct inode *inode)
 	if (inode_has_buffers(inode)) {
 		struct address_space *mapping = &inode->i_data;
 		struct list_head *list = &mapping->i_private_list;
-		struct address_space *buffer_mapping = mapping->i_private_data;
+		struct address_space *buffer_mapping =
+				mapping->host->i_sb->s_bdev->bd_mapping;
 
 		spin_lock(&buffer_mapping->i_private_lock);
 		while (!list_empty(list))
-- 
2.51.0