btrfs: make btrfs_iget_path() return a btrfs inode instead

It's an internal function and btrfs_iget() is now returning a btrfs inode,
so change btrfs_iget_path() to also return a btrfs inode instead of a VFS
inode.

Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

Author: fdmanana

fs/btrfs/btrfs_inode.h

@@ -593,8 +593,8 @@ void btrfs_free_inode(struct inode *inode);
 int btrfs_drop_inode(struct inode *inode);
 int __init btrfs_init_cachep(void);
 void __cold btrfs_destroy_cachep(void);
-struct inode *btrfs_iget_path(u64 ino, struct btrfs_root *root,
-			      struct btrfs_path *path);
+struct btrfs_inode *btrfs_iget_path(u64 ino, struct btrfs_root *root,
+				    struct btrfs_path *path);
 struct btrfs_inode *btrfs_iget(u64 ino, struct btrfs_root *root);
 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
 				    struct folio *folio, u64 start, u64 len);

fs/btrfs/free-space-cache.c

@@ -88,7 +88,7 @@ static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
 	struct btrfs_disk_key disk_key;
 	struct btrfs_free_space_header *header;
 	struct extent_buffer *leaf;
-	struct inode *inode = NULL;
+	struct btrfs_inode *inode;
 	unsigned nofs_flag;
 	int ret;
 
@@ -120,13 +120,13 @@ static struct inode *__lookup_free_space_inode(struct btrfs_root *root,
 	btrfs_release_path(path);
 	memalloc_nofs_restore(nofs_flag);
 	if (IS_ERR(inode))
-		return inode;
+		return ERR_CAST(inode);
 
-	mapping_set_gfp_mask(inode->i_mapping,
-			mapping_gfp_constraint(inode->i_mapping,
+	mapping_set_gfp_mask(inode->vfs_inode.i_mapping,
+			mapping_gfp_constraint(inode->vfs_inode.i_mapping,
 			~(__GFP_FS | __GFP_HIGHMEM)));
 
-	return inode;
+	return &inode->vfs_inode;
 }
 
 struct inode *lookup_free_space_inode(struct btrfs_block_group *block_group,

fs/btrfs/inode.c

@@ -5642,8 +5642,8 @@ static struct btrfs_inode *btrfs_iget_locked(u64 ino, struct btrfs_root *root)
  * Get an inode object given its inode number and corresponding root.  Path is
  * preallocated to prevent recursing back to iget through allocator.
  */
-struct inode *btrfs_iget_path(u64 ino, struct btrfs_root *root,
-			      struct btrfs_path *path)
+struct btrfs_inode *btrfs_iget_path(u64 ino, struct btrfs_root *root,
+				    struct btrfs_path *path)
 {
 	struct btrfs_inode *inode;
 	int ret;
@@ -5653,14 +5653,14 @@ struct inode *btrfs_iget_path(u64 ino, struct btrfs_root *root,
 		return ERR_PTR(-ENOMEM);
 
 	if (!(inode->vfs_inode.i_state & I_NEW))
-		return &inode->vfs_inode;
+		return inode;
 
 	ret = btrfs_read_locked_inode(inode, path);
 	if (ret)
 		return ERR_PTR(ret);
 
 	unlock_new_inode(&inode->vfs_inode);
-	return &inode->vfs_inode;
+	return inode;
 }
 
 /*