add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/jfs/namei.c
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@@ -1,20 +1,7 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /*
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  *   Copyright (C) International Business Machines Corp., 2000-2004
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  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
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- *
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- *   This program is free software;  you can redistribute it and/or modify
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- *   it under the terms of the GNU General Public License as published by
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- *   the Free Software Foundation; either version 2 of the License, or
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- *   (at your option) any later version.
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- *
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- *   This program is distributed in the hope that it will be useful,
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- *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
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- *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
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- *   the GNU General Public License for more details.
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- *
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- *   You should have received a copy of the GNU General Public License
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- *   along with this program;  if not, write to the Free Software
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- *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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  */
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 #include <linux/fs.h>
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@@ -203,7 +190,7 @@
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  * RETURN:	Errors from subroutines
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  *
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  * note:
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- * EACCESS: user needs search+write permission on the parent directory
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+ * EACCES: user needs search+write permission on the parent directory
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  */
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 static int jfs_mkdir(struct inode *dip, struct dentry *dentry, umode_t mode)
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 {
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@@ -811,6 +798,11 @@
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 	if (rc)
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 		goto out;
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+	if (isReadOnly(ip)) {
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+		jfs_error(ip->i_sb, "read-only filesystem\n");
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+		return -EROFS;
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+	}
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+
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 	tid = txBegin(ip->i_sb, 0);
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 	mutex_lock_nested(&JFS_IP(dir)->commit_mutex, COMMIT_MUTEX_PARENT);