btrfs: remove super block argument from btrfs_iget()

It's pointless to pass a super block argument to btrfs_iget() because we
always pass a root and from it we can get the super block through:

root->fs_info->sb

So remove the super block argument.

Reviewed-by: Johannes Thumshirn <[e-mail]>
Reviewed-by: Josef Bacik <[e-mail]>
Reviewed-by: Qu Wenruo <[e-mail]>
Signed-off-by: Filipe Manana <[e-mail]>
Reviewed-by: David Sterba <[e-mail]>
Signed-off-by: David Sterba <[e-mail]>

fs/btrfs/btrfs_inode.h

···
 void __cold btrfs_destroy_cachep(void);
 struct inode *btrfs_iget_path(struct super_block *s, u64 ino,
 			      struct btrfs_root *root, struct btrfs_path *path);
-struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root);
+struct inode *btrfs_iget(u64 ino, struct btrfs_root *root);
 struct extent_map *btrfs_get_extent(struct btrfs_inode *inode,
 				    struct page *page, u64 start, u64 len);
 int btrfs_update_inode(struct btrfs_trans_handle *trans,

fs/btrfs/defrag.c

···
 		goto cleanup;
 	}
 
-	inode = btrfs_iget(fs_info->sb, defrag->ino, inode_root);
+	inode = btrfs_iget(defrag->ino, inode_root);
 	btrfs_put_root(inode_root);
 	if (IS_ERR(inode)) {
 		ret = PTR_ERR(inode);

fs/btrfs/export.c

···
 	if (IS_ERR(root))
 		return ERR_CAST(root);
 
-	inode = btrfs_iget(sb, objectid, root);
+	inode = btrfs_iget(objectid, root);
 	btrfs_put_root(root);
 	if (IS_ERR(inode))
 		return ERR_CAST(inode);
···
 					found_key.offset, 0);
 	}
 
-	return d_obtain_alias(btrfs_iget(fs_info->sb, key.objectid, root));
+	return d_obtain_alias(btrfs_iget(key.objectid, root));
 fail:
 	btrfs_free_path(path);
 	return ERR_PTR(ret);

fs/btrfs/inode.c

···
 		found_key.objectid = found_key.offset;
 		found_key.type = BTRFS_INODE_ITEM_KEY;
 		found_key.offset = 0;
-		inode = btrfs_iget(fs_info->sb, last_objectid, root);
+		inode = btrfs_iget(last_objectid, root);
 		if (IS_ERR(inode)) {
 			ret = PTR_ERR(inode);
 			inode = NULL;
···
 	return ERR_PTR(ret);
 }
 
-struct inode *btrfs_iget(struct super_block *s, u64 ino, struct btrfs_root *root)
+struct inode *btrfs_iget(u64 ino, struct btrfs_root *root)
 {
-	return btrfs_iget_path(s, ino, root, NULL);
+	return btrfs_iget_path(root->fs_info->sb, ino, root, NULL);
 }
 
 static struct inode *new_simple_dir(struct inode *dir,
···
 		return ERR_PTR(ret);
 
 	if (location.type == BTRFS_INODE_ITEM_KEY) {
-		inode = btrfs_iget(dir->i_sb, location.objectid, root);
+		inode = btrfs_iget(location.objectid, root);
 		if (IS_ERR(inode))
 			return inode;
 
···
 		else
 			inode = new_simple_dir(dir, &location, root);
 	} else {
-		inode = btrfs_iget(dir->i_sb, location.objectid, sub_root);
+		inode = btrfs_iget(location.objectid, sub_root);
 		btrfs_put_root(sub_root);
 
 		if (IS_ERR(inode))
···
 		 * Subvolumes inherit properties from their parent subvolume,
 		 * not the directory they were created in.
 		 */
-		parent = btrfs_iget(fs_info->sb, BTRFS_FIRST_FREE_OBJECTID,
-				    BTRFS_I(dir)->root);
+		parent = btrfs_iget(BTRFS_FIRST_FREE_OBJECTID, BTRFS_I(dir)->root);
 		if (IS_ERR(parent)) {
 			ret = PTR_ERR(parent);
 		} else {

fs/btrfs/ioctl.c

···
 				struct btrfs_ioctl_ino_lookup_user_args *args)
 {
 	struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info;
-	struct super_block *sb = inode->i_sb;
 	u64 upper_limit = btrfs_ino(BTRFS_I(inode));
 	u64 treeid = btrfs_root_id(BTRFS_I(inode)->root);
 	u64 dirid = args->dirid;
···
 			 * btree and lock the same leaf.
 			 */
 			btrfs_release_path(path);
-			temp_inode = btrfs_iget(sb, key2.objectid, root);
+			temp_inode = btrfs_iget(key2.objectid, root);
 			if (IS_ERR(temp_inode)) {
 				ret = PTR_ERR(temp_inode);
 				goto out_put;

fs/btrfs/relocation.c

···
 	if (inode)
 		goto truncate;
 
-	inode = btrfs_iget(fs_info->sb, ino, root);
+	inode = btrfs_iget(ino, root);
 	if (IS_ERR(inode))
 		return -ENOENT;
 
···
 	if (ret)
 		goto out;
 
-	inode = btrfs_iget(fs_info->sb, objectid, root);
+	inode = btrfs_iget(objectid, root);
 	if (IS_ERR(inode)) {
 		delete_orphan_inode(trans, root, objectid);
 		ret = PTR_ERR(inode);

fs/btrfs/send.c

···
 static int process_verity(struct send_ctx *sctx)
 {
 	int ret = 0;
-	struct btrfs_fs_info *fs_info = sctx->send_root->fs_info;
 	struct inode *inode;
 	struct fs_path *p;
 
-	inode = btrfs_iget(fs_info->sb, sctx->cur_ino, sctx->send_root);
+	inode = btrfs_iget(sctx->cur_ino, sctx->send_root);
 	if (IS_ERR(inode))
 		return PTR_ERR(inode);
 
···
 	size_t inline_size;
 	int ret;
 
-	inode = btrfs_iget(fs_info->sb, sctx->cur_ino, root);
+	inode = btrfs_iget(sctx->cur_ino, root);
 	if (IS_ERR(inode))
 		return PTR_ERR(inode);
 
···
 	u32 crc;
 	int ret;
 
-	inode = btrfs_iget(fs_info->sb, sctx->cur_ino, root);
+	inode = btrfs_iget(sctx->cur_ino, root);
 	if (IS_ERR(inode))
 		return PTR_ERR(inode);
 
···
 	if (sctx->cur_inode == NULL) {
 		struct btrfs_root *root = sctx->send_root;
 
-		sctx->cur_inode = btrfs_iget(root->fs_info->sb, sctx->cur_ino, root);
+		sctx->cur_inode = btrfs_iget(sctx->cur_ino, root);
 		if (IS_ERR(sctx->cur_inode)) {
 			int err = PTR_ERR(sctx->cur_inode);
 

fs/btrfs/super.c

···
 		return err;
 	}
 
-	inode = btrfs_iget(sb, BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root);
+	inode = btrfs_iget(BTRFS_FIRST_FREE_OBJECTID, fs_info->fs_root);
 	if (IS_ERR(inode)) {
 		err = PTR_ERR(inode);
 		btrfs_handle_fs_error(fs_info, err, NULL);

fs/btrfs/tree-log.c

···
 	 * attempt a transaction commit, resulting in a deadlock.
 	 */
 	nofs_flag = memalloc_nofs_save();
-	inode = btrfs_iget(root->fs_info->sb, objectid, root);
+	inode = btrfs_iget(objectid, root);
 	memalloc_nofs_restore(nofs_flag);
 
 	return inode;