bfs: Track metadata bhs in fs-private inode part

Track metadata bhs for an inode in fs-private part of the inode.

Signed-off-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260326095354.16340-78-jack@suse.cz
Signed-off-by: Christian Brauner <brauner@kernel.org>

Author: jankara

fs/bfs/bfs.h

@@ -35,6 +35,7 @@ struct bfs_inode_info {
 	unsigned long i_dsk_ino; /* inode number from the disk, can be 0 */
 	unsigned long i_sblock;
 	unsigned long i_eblock;
+	struct mapping_metadata_bhs i_metadata_bhs;
 	struct inode vfs_inode;
 };
 

fs/bfs/dir.c

@@ -68,10 +68,17 @@ static int bfs_readdir(struct file *f, struct dir_context *ctx)
 	return 0;
 }
 
+static int bfs_fsync(struct file *file, loff_t start, loff_t end, int datasync)
+{
+	return mmb_fsync(file,
+			&BFS_I(file->f_mapping->host)->i_metadata_bhs,
+			start, end, datasync);
+}
+
 const struct file_operations bfs_dir_operations = {
 	.read		= generic_read_dir,
 	.iterate_shared	= bfs_readdir,
-	.fsync		= generic_buffers_fsync,
+	.fsync		= bfs_fsync,
 	.llseek		= generic_file_llseek,
 };
 
@@ -186,7 +193,7 @@ static int bfs_unlink(struct inode *dir, struct dentry *dentry)
 		set_nlink(inode, 1);
 	}
 	de->ino = 0;
-	mark_buffer_dirty_inode(bh, dir);
+	mmb_mark_buffer_dirty(bh, &BFS_I(dir)->i_metadata_bhs);
 	inode_set_mtime_to_ts(dir, inode_set_ctime_current(dir));
 	mark_inode_dirty(dir);
 	inode_set_ctime_to_ts(inode, inode_get_ctime(dir));
@@ -246,7 +253,7 @@ static int bfs_rename(struct mnt_idmap *idmap, struct inode *old_dir,
 		inode_set_ctime_current(new_inode);
 		inode_dec_link_count(new_inode);
 	}
-	mark_buffer_dirty_inode(old_bh, old_dir);
+	mmb_mark_buffer_dirty(old_bh, &BFS_I(old_dir)->i_metadata_bhs);
 	error = 0;
 
 end_rename:
@@ -296,7 +303,8 @@ static int bfs_add_entry(struct inode *dir, const struct qstr *child, int ino)
 				for (i = 0; i < BFS_NAMELEN; i++)
 					de->name[i] =
 						(i < namelen) ? name[i] : 0;
-				mark_buffer_dirty_inode(bh, dir);
+				mmb_mark_buffer_dirty(bh,
+						&BFS_I(dir)->i_metadata_bhs);
 				brelse(bh);
 				return 0;
 			}

fs/bfs/inode.c

@@ -188,8 +188,8 @@ static void bfs_evict_inode(struct inode *inode)
 
 	truncate_inode_pages_final(&inode->i_data);
 	if (inode->i_nlink)
-		sync_mapping_buffers(&inode->i_data);
-	invalidate_inode_buffers(inode);
+		mmb_sync(&BFS_I(inode)->i_metadata_bhs);
+	mmb_invalidate(&BFS_I(inode)->i_metadata_bhs);
 	clear_inode(inode);
 
 	if (inode->i_nlink)
@@ -259,6 +259,8 @@ static struct inode *bfs_alloc_inode(struct super_block *sb)
 	bi = alloc_inode_sb(sb, bfs_inode_cachep, GFP_KERNEL);
 	if (!bi)
 		return NULL;
+	mmb_init(&bi->i_metadata_bhs, &bi->vfs_inode.i_data);
+
 	return &bi->vfs_inode;
 }