linux-kernel - [PATCH 4.9 90/97] reiserfs: fix handling of -EOPNOTSUPP in reiserfs_for_each

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Date:   Wed, 22 Jan 2020 10:29:34 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Michael Brunnbauer <brunni@...estate.de>,
        Jeff Mahoney <jeffm@...e.com>, Jan Kara <jack@...e.cz>
Subject: [PATCH 4.9 90/97] reiserfs: fix handling of -EOPNOTSUPP in reiserfs_for_each_xattr

From: Jeff Mahoney <jeffm@...e.com>

commit 394440d469413fa9b74f88a11f144d76017221f2 upstream.

Commit 60e4cf67a58 (reiserfs: fix extended attributes on the root
directory) introduced a regression open_xa_root started returning
-EOPNOTSUPP but it was not handled properly in reiserfs_for_each_xattr.

When the reiserfs module is built without CONFIG_REISERFS_FS_XATTR,
deleting an inode would result in a warning and chowning an inode
would also result in a warning and then fail to complete.

With CONFIG_REISERFS_FS_XATTR enabled, the xattr root would always be
present for read-write operations.

This commit handles -EOPNOSUPP in the same way -ENODATA is handled.

Fixes: 60e4cf67a582 ("reiserfs: fix extended attributes on the root directory")
CC: stable@...r.kernel.org	# Commit 60e4cf67a58 was picked up by stable
Link: https://lore.kernel.org/r/20200115180059.6935-1-jeffm@suse.com
Reported-by: Michael Brunnbauer <brunni@...estate.de>
Signed-off-by: Jeff Mahoney <jeffm@...e.com>
Signed-off-by: Jan Kara <jack@...e.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 fs/reiserfs/xattr.c |    8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

--- a/fs/reiserfs/xattr.c
+++ b/fs/reiserfs/xattr.c
@@ -318,8 +318,12 @@ static int reiserfs_for_each_xattr(struc
 out_dir:
 	dput(dir);
 out:
-	/* -ENODATA isn't an error */
-	if (err == -ENODATA)
+	/*
+	 * -ENODATA: this object doesn't have any xattrs
+	 * -EOPNOTSUPP: this file system doesn't have xattrs enabled on disk.
+	 * Neither are errors
+	 */
+	if (err == -ENODATA || err == -EOPNOTSUPP)
 		err = 0;
 	return err;
 }