switch shmem_file_setup() to alloc_file()

Signed-off-by: NAl Viro <viro@zeniv.linux.org.uk>

mm/shmem.c

@@ -2647,32 +2647,29 @@ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags
 	if (!dentry)
 		goto put_memory;
 
-	error = -ENFILE;
-	file = get_empty_filp();
-	if (!file)
-		goto put_dentry;
-
 	error = -ENOSPC;
 	inode = shmem_get_inode(root->d_sb, S_IFREG | S_IRWXUGO, 0, flags);
 	if (!inode)
-		goto close_file;
+		goto put_dentry;
 
 	d_instantiate(dentry, inode);
 	inode->i_size = size;
 	inode->i_nlink = 0;	/* It is unlinked */
-	init_file(file, shm_mnt, dentry, FMODE_WRITE | FMODE_READ,
-		  &shmem_file_operations);
-
 #ifndef CONFIG_MMU
 	error = ramfs_nommu_expand_for_mapping(inode, size);
 	if (error)
-		goto close_file;
+		goto put_dentry;
 #endif
+
+	error = -ENFILE;
+	file = alloc_file(shm_mnt, dentry, FMODE_WRITE | FMODE_READ,
+		  &shmem_file_operations);
+	if (!file)
+		goto put_dentry;
+
 	ima_counts_get(file);
 	return file;
 
-close_file:
-	put_filp(file);
 put_dentry:
 	dput(dentry);
 put_memory: