linux-kernel - [RFC PATCH 35/68] vfs: Convert xenfs to use the new mount API

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:   Wed, 27 Mar 2019 23:44:57 +0000
From:   David Howells <dhowells@...hat.com>
To:     viro@...iv.linux.org.uk
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, dhowells@...hat.com
Subject: [RFC PATCH 35/68] vfs: Convert xenfs to use the new mount API

Convert the xenfs filesystem to the new internal mount API as the old
one will be obsoleted and removed.  This allows greater flexibility in
communication of mount parameters between userspace, the VFS and the
filesystem.

See Documentation/filesystems/mount_api.txt for more information.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
cc: Juergen Gross <jgross@...e.com>
cc: Stefano Stabellini <sstabellini@...nel.org>
cc: xen-devel@...ts.xenproject.org
---

 drivers/xen/xenfs/super.c |   21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 71ddfb4cf61c..2e16214e9c7f 100644
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -13,6 +13,7 @@
 #include <linux/errno.h>
 #include <linux/module.h>
 #include <linux/fs.h>
+#include <linux/fs_context.h>
 #include <linux/magic.h>
 
 #include <xen/xen.h>
@@ -42,7 +43,7 @@ static const struct file_operations capabilities_file_ops = {
 	.llseek = default_llseek,
 };
 
-static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
+static int xenfs_fill_super(struct super_block *sb, struct fs_context *fc)
 {
 	static const struct tree_descr xenfs_files[] = {
 		[2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
@@ -67,17 +68,25 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
 			xen_initial_domain() ? xenfs_init_files : xenfs_files);
 }
 
-static struct dentry *xenfs_mount(struct file_system_type *fs_type,
-				  int flags, const char *dev_name,
-				  void *data)
+static int xenfs_get_tree(struct fs_context *fc)
 {
-	return mount_single(fs_type, flags, data, xenfs_fill_super);
+	return vfs_get_super(fc, vfs_get_single_super, xenfs_fill_super);
+}
+
+static const struct fs_context_operations xenfs_context_ops = {
+	.get_tree	= xenfs_get_tree,
+};
+
+static int xenfs_init_fs_context(struct fs_context *fc)
+{
+	fc->ops = &xenfs_context_ops;
+	return 0;
 }
 
 static struct file_system_type xenfs_type = {
 	.owner =	THIS_MODULE,
 	.name =		"xenfs",
-	.mount =	xenfs_mount,
+	.init_fs_context = xenfs_init_fs_context,
 	.kill_sb =	kill_litter_super,
 };
 MODULE_ALIAS_FS("xenfs");