From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 51300355020; Tue, 16 Dec 2025 11:50:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765885814; cv=none; b=bYDfPGp6gIxTn9iAMvtcnGOYfe7mT4k/WhBxglg2rBI8FI3sWZNh/A+kQz8laT6B9xoGCWvYj6OWGxqqME2RYx/jGl3GC6P64FOUV9Sl2IX06YLQYc9V1MNftikKXEhc9ygzlsXcKK7xHFdIiloNREjYQIpaPejGk3Qh6eZk8yg= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765885814; c=relaxed/simple; bh=i/bhMN3c2YAWcI8oXCJNGWZra2IShMthmG4YiWSBT7k=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=ZAyA8+xAbfcyRMzLKrNslevx72OWez07vzhySPCxZZ7Gshr7/+m0TpihKdcLHsYWpavH/G77+rtih9izzQ8fBxDIdsnOeioi0WyXe3Znv5wWMFKDW+WivIGW+bLXaAkoJ20FKmSiHxa9kwe+2LxU1/AarZlXzhVT+oNg1MuSi0o= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zBiYSUOy; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="zBiYSUOy" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 9B15EC4CEF1; Tue, 16 Dec 2025 11:50:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1765885814; bh=i/bhMN3c2YAWcI8oXCJNGWZra2IShMthmG4YiWSBT7k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zBiYSUOykKAczFDEK0U53oy/nLs57haHKh+OknfKH2Unhm4hjk4QudRlWW79PL+4m bTO1hnIaNUjnI47YOhhI0bi8c4OOL19qYKl99+SscMGHG3dKIcFZr1tNcy0sdmosgX Fcb/CLxaLU+vINbF9Ip/f2ZWeAYMOBTSHyW5Jtcs= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Miklos Szeredi , Al Viro , Sasha Levin Subject: [PATCH 6.17 253/507] fuse_ctl_add_conn(): fix nlink breakage in case of early failure Date: Tue, 16 Dec 2025 12:11:34 +0100 Message-ID: <20251216111354.657895061@linuxfoundation.org> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251216111345.522190956@linuxfoundation.org> References: <20251216111345.522190956@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.17-stable review patch. If anyone has any objections, please let me know. ------------------ From: Al Viro [ Upstream commit c460192aae197df1b4db1dca493c35ad529f1b64 ] fuse_ctl_remove_conn() used to decrement the link count of root manually; that got subsumed by simple_recursive_removal(), but in case when subdirectory creation has failed the latter won't get called. Just move the modification of parent's link count into fuse_ctl_add_dentry() to keep the things simple. Allows to get rid of the nlink argument as well... Fixes: fcaac5b42768 "fuse_ctl: use simple_recursive_removal()" Acked-by: Miklos Szeredi Signed-off-by: Al Viro Signed-off-by: Sasha Levin --- fs/fuse/control.c | 19 ++++++++++--------- 1 file changed, 10 insertions(+), 9 deletions(-) diff --git a/fs/fuse/control.c b/fs/fuse/control.c index bb407705603c2..5247df896c5d0 100644 --- a/fs/fuse/control.c +++ b/fs/fuse/control.c @@ -205,8 +205,7 @@ static const struct file_operations fuse_conn_congestion_threshold_ops = { static struct dentry *fuse_ctl_add_dentry(struct dentry *parent, struct fuse_conn *fc, - const char *name, - int mode, int nlink, + const char *name, int mode, const struct inode_operations *iop, const struct file_operations *fop) { @@ -232,7 +231,10 @@ static struct dentry *fuse_ctl_add_dentry(struct dentry *parent, if (iop) inode->i_op = iop; inode->i_fop = fop; - set_nlink(inode, nlink); + if (S_ISDIR(mode)) { + inc_nlink(d_inode(parent)); + inc_nlink(inode); + } inode->i_private = fc; d_add(dentry, inode); @@ -252,22 +254,21 @@ int fuse_ctl_add_conn(struct fuse_conn *fc) return 0; parent = fuse_control_sb->s_root; - inc_nlink(d_inode(parent)); sprintf(name, "%u", fc->dev); - parent = fuse_ctl_add_dentry(parent, fc, name, S_IFDIR | 0500, 2, + parent = fuse_ctl_add_dentry(parent, fc, name, S_IFDIR | 0500, &simple_dir_inode_operations, &simple_dir_operations); if (!parent) goto err; - if (!fuse_ctl_add_dentry(parent, fc, "waiting", S_IFREG | 0400, 1, + if (!fuse_ctl_add_dentry(parent, fc, "waiting", S_IFREG | 0400, NULL, &fuse_ctl_waiting_ops) || - !fuse_ctl_add_dentry(parent, fc, "abort", S_IFREG | 0200, 1, + !fuse_ctl_add_dentry(parent, fc, "abort", S_IFREG | 0200, NULL, &fuse_ctl_abort_ops) || !fuse_ctl_add_dentry(parent, fc, "max_background", S_IFREG | 0600, - 1, NULL, &fuse_conn_max_background_ops) || + NULL, &fuse_conn_max_background_ops) || !fuse_ctl_add_dentry(parent, fc, "congestion_threshold", - S_IFREG | 0600, 1, NULL, + S_IFREG | 0600, NULL, &fuse_conn_congestion_threshold_ops)) goto err; -- 2.51.0