add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/xen/xenfs/super.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  *  xenfs.c - a filesystem for passing info between the a domain and
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  *  the hypervisor.
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@@ -13,6 +14,7 @@
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 #include <linux/errno.h>
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 #include <linux/module.h>
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 #include <linux/fs.h>
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+#include <linux/fs_context.h>
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 #include <linux/magic.h>
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 #include <xen/xen.h>
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@@ -42,7 +44,7 @@
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 	.llseek = default_llseek,
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 };
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-static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
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+static int xenfs_fill_super(struct super_block *sb, struct fs_context *fc)
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 {
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 	static const struct tree_descr xenfs_files[] = {
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 		[2] = { "xenbus", &xen_xenbus_fops, S_IRUSR|S_IWUSR },
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@@ -67,17 +69,25 @@
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 			xen_initial_domain() ? xenfs_init_files : xenfs_files);
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 }
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-static struct dentry *xenfs_mount(struct file_system_type *fs_type,
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-				  int flags, const char *dev_name,
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-				  void *data)
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+static int xenfs_get_tree(struct fs_context *fc)
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 {
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-	return mount_single(fs_type, flags, data, xenfs_fill_super);
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+	return get_tree_single(fc, xenfs_fill_super);
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+}
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+
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+static const struct fs_context_operations xenfs_context_ops = {
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+	.get_tree	= xenfs_get_tree,
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+};
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+
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+static int xenfs_init_fs_context(struct fs_context *fc)
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+{
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+	fc->ops = &xenfs_context_ops;
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+	return 0;
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 }
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 static struct file_system_type xenfs_type = {
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 	.owner =	THIS_MODULE,
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 	.name =		"xenfs",
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-	.mount =	xenfs_mount,
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+	.init_fs_context = xenfs_init_fs_context,
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 	.kill_sb =	kill_litter_super,
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 };
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 MODULE_ALIAS_FS("xenfs");