linux-kernel - [PATCH 31/38] vfs: Convert gadgetfs to fs

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Date:   Thu, 14 Mar 2019 16:13:06 +0000
From:   David Howells <dhowells@...hat.com>
To:     viro@...iv.linux.org.uk
Cc:     Felipe Balbi <balbi@...nel.org>, linux-usb@...r.kernel.org,
        dhowells@...hat.com, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 31/38] vfs: Convert gadgetfs to fs_context

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Felipe Balbi <balbi@...nel.org>
cc: linux-usb@...r.kernel.org
---

 drivers/usb/gadget/legacy/inode.c |   21 +++++++++++++++------
 1 file changed, 15 insertions(+), 6 deletions(-)

diff --git a/drivers/usb/gadget/legacy/inode.c b/drivers/usb/gadget/legacy/inode.c
index 249277d0e53f..441da16ffc39 100644
--- a/drivers/usb/gadget/legacy/inode.c
+++ b/drivers/usb/gadget/legacy/inode.c
@@ -12,6 +12,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/fs.h>
+#include <linux/fs_context.h>
 #include <linux/pagemap.h>
 #include <linux/uts.h>
 #include <linux/wait.h>
@@ -1990,7 +1991,7 @@ static const struct super_operations gadget_fs_operations = {
 };
 
 static int
-gadgetfs_fill_super (struct super_block *sb, void *opts, int silent)
+gadgetfs_fill_super (struct super_block *sb, struct fs_context *fc)
 {
 	struct inode	*inode;
 	struct dev_data	*dev;
@@ -2044,11 +2045,19 @@ gadgetfs_fill_super (struct super_block *sb, void *opts, int silent)
 }
 
 /* "mount -t gadgetfs path /dev/gadget" ends up here */
-static struct dentry *
-gadgetfs_mount (struct file_system_type *t, int flags,
-		const char *path, void *opts)
+static int gadgetfs_get_tree(struct fs_context *fc)
 {
-	return mount_single (t, flags, opts, gadgetfs_fill_super);
+	return vfs_get_super(fc, vfs_get_single_super, gadgetfs_fill_super);
+}
+
+static const struct fs_context_operations gadgetfs_context_ops = {
+	.get_tree	= gadgetfs_get_tree,
+};
+
+static int gadgetfs_init_fs_context(struct fs_context *fc)
+{
+	fc->ops = &gadgetfs_context_ops;
+	return 0;
 }
 
 static void
@@ -2068,7 +2077,7 @@ gadgetfs_kill_sb (struct super_block *sb)
 static struct file_system_type gadgetfs_type = {
 	.owner		= THIS_MODULE,
 	.name		= shortname,
-	.mount		= gadgetfs_mount,
+	.init_fs_context = gadgetfs_init_fs_context,
 	.kill_sb	= gadgetfs_kill_sb,
 };
 MODULE_ALIAS_FS("gadgetfs");