fs: Drop i_private_list from address_space

Nobody is using i_private_list anymore. Remove it.

Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260326095354.16340-84-jack@suse.cz
Tested-by: syzbot@syzkaller.appspotmail.com
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: jankara

fs/inode.c

@@ -481,7 +481,6 @@ static void __address_space_init_once(struct address_space *mapping)
 {
 	xa_init_flags(&mapping->i_pages, XA_FLAGS_LOCK_IRQ | XA_FLAGS_ACCOUNT);
 	init_rwsem(&mapping->i_mmap_rwsem);
-	INIT_LIST_HEAD(&mapping->i_private_list);
 	spin_lock_init(&mapping->i_private_lock);
 	mapping->i_mmap = RB_ROOT_CACHED;
 }
@@ -795,7 +794,6 @@ void clear_inode(struct inode *inode)
 	 * nor even WARN_ON(!mapping_empty).
 	 */
 	xa_unlock_irq(&inode->i_data.i_pages);
-	BUG_ON(!list_empty(&inode->i_data.i_private_list));
 	BUG_ON(!(inode_state_read_once(inode) & I_FREEING));
 	BUG_ON(inode_state_read_once(inode) & I_CLEAR);
 	BUG_ON(!list_empty(&inode->i_wb_list));

include/linux/fs.h

@@ -471,7 +471,6 @@ struct mapping_metadata_bhs {
  * @flags: Error bits and flags (AS_*).
  * @wb_err: The most recent error which has occurred.
  * @i_private_lock: For use by the owner of the address_space.
- * @i_private_list: For use by the owner of the address_space.
  */
 struct address_space {
 	struct inode		*host;
@@ -490,7 +489,6 @@ struct address_space {
 	unsigned long		flags;
 	errseq_t		wb_err;
 	spinlock_t		i_private_lock;
-	struct list_head	i_private_list;
 	struct rw_semaphore	i_mmap_rwsem;
 } __attribute__((aligned(sizeof(long)))) __randomize_layout;
 	/*