fs: Drop mapping_metadata_bhs from address space

Nobody uses mapping_metadata_bhs in struct address_space anymore. Just
remove it and with it all helper functions using it.

Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260326095354.16340-83-jack@suse.cz
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: jankara

fs/inode.c

@@ -276,7 +276,6 @@ int inode_init_always_gfp(struct super_block *sb, struct inode *inode, gfp_t gfp
 
 	mapping->a_ops = &empty_aops;
 	mapping->host = inode;
-	mapping->i_metadata_bhs.mapping = mapping;
 	mapping->flags = 0;
 	mapping->wb_err = 0;
 	atomic_set(&mapping->i_mmap_writable, 0);
@@ -484,8 +483,6 @@ static void __address_space_init_once(struct address_space *mapping)
 	init_rwsem(&mapping->i_mmap_rwsem);
 	INIT_LIST_HEAD(&mapping->i_private_list);
 	spin_lock_init(&mapping->i_private_lock);
-	spin_lock_init(&mapping->i_metadata_bhs.lock);
-	INIT_LIST_HEAD(&mapping->i_metadata_bhs.list);
 	mapping->i_mmap = RB_ROOT_CACHED;
 }
 

include/linux/buffer_head.h

@@ -207,28 +207,10 @@ void end_buffer_write_sync(struct buffer_head *bh, int uptodate);
 
 /* Things to do with metadata buffers list */
 void mmb_mark_buffer_dirty(struct buffer_head *bh, struct mapping_metadata_bhs *mmb);
-static inline void mark_buffer_dirty_inode(struct buffer_head *bh,
-					   struct inode *inode)
-{
-	mmb_mark_buffer_dirty(bh, &inode->i_data.i_metadata_bhs);
-}
 int mmb_fsync_noflush(struct file *file, struct mapping_metadata_bhs *mmb,
 		      loff_t start, loff_t end, bool datasync);
-static inline int generic_buffers_fsync_noflush(struct file *file,
-						loff_t start, loff_t end,
-						bool datasync)
-{
-	return mmb_fsync_noflush(file, &file->f_mapping->i_metadata_bhs,
-				 start, end, datasync);
-}
 int mmb_fsync(struct file *file, struct mapping_metadata_bhs *mmb,
 	      loff_t start, loff_t end, bool datasync);
-static inline int generic_buffers_fsync(struct file *file,
-					loff_t start, loff_t end, bool datasync)
-{
-	return mmb_fsync(file, &file->f_mapping->i_metadata_bhs,
-			 start, end, datasync);
-}
 void clean_bdev_aliases(struct block_device *bdev, sector_t block,
 			sector_t len);
 static inline void clean_bdev_bh_alias(struct buffer_head *bh)
@@ -537,14 +519,6 @@ void mmb_init(struct mapping_metadata_bhs *mmb, struct address_space *mapping);
 bool mmb_has_buffers(struct mapping_metadata_bhs *mmb);
 void mmb_invalidate(struct mapping_metadata_bhs *mmb);
 int mmb_sync(struct mapping_metadata_bhs *mmb);
-static inline void invalidate_inode_buffers(struct inode *inode)
-{
-	mmb_invalidate(&inode->i_data.i_metadata_bhs);
-}
-static inline int sync_mapping_buffers(struct address_space *mapping)
-{
-	return mmb_sync(&mapping->i_metadata_bhs);
-}
 void invalidate_bh_lrus(void);
 void invalidate_bh_lrus_cpu(void);
 bool has_bh_in_lru(int cpu, void *dummy);
@@ -555,8 +529,6 @@ extern int buffer_heads_over_limit;
 static inline void buffer_init(void) {}
 static inline bool try_to_free_buffers(struct folio *folio) { return true; }
 static inline int mmb_sync(struct mapping_metadata_bhs *mmb) { return 0; }
-static inline void invalidate_inode_buffers(struct inode *inode) {}
-static inline int sync_mapping_buffers(struct address_space *mapping) { return 0; }
 static inline void invalidate_bh_lrus(void) {}
 static inline void invalidate_bh_lrus_cpu(void) {}
 static inline bool has_bh_in_lru(int cpu, void *dummy) { return false; }

include/linux/fs.h

@@ -491,7 +491,6 @@ struct address_space {
 	errseq_t		wb_err;
 	spinlock_t		i_private_lock;
 	struct list_head	i_private_list;
-	struct mapping_metadata_bhs i_metadata_bhs;
 	struct rw_semaphore	i_mmap_rwsem;
 } __attribute__((aligned(sizeof(long)))) __randomize_layout;
 	/*