add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/configfs/mount.c
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@@ -1,22 +1,8 @@
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+// SPDX-License-Identifier: GPL-2.0-or-later
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 /* -*- mode: c; c-basic-offset: 8; -*-
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  * vim: noexpandtab sw=8 ts=8 sts=0:
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  *
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  * mount.c - operations for initializing and mounting configfs.
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- *
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- * This program is free software; you can redistribute it and/or
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- * modify it under the terms of the GNU General Public
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- * License as published by the Free Software Foundation; either
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- * version 2 of the License, or (at your option) any later version.
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- *
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- * This program is distributed in the hope that it will be useful,
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- * but WITHOUT ANY WARRANTY; without even the implied warranty of
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- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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- * General Public License for more details.
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- *
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- * You should have received a copy of the GNU General Public
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- * License along with this program; if not, write to the
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- * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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- * Boston, MA 021110-1307, USA.
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  *
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  * Based on sysfs:
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  * 	sysfs is Copyright (C) 2001, 2002, 2003 Patrick Mochel
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@@ -27,6 +13,7 @@
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 #include <linux/fs.h>
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 #include <linux/module.h>
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 #include <linux/mount.h>
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+#include <linux/fs_context.h>
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 #include <linux/pagemap.h>
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 #include <linux/init.h>
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 #include <linux/slab.h>
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@@ -41,9 +28,18 @@
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 struct kmem_cache *configfs_dir_cachep;
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 static int configfs_mnt_count = 0;
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+
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+static void configfs_free_inode(struct inode *inode)
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+{
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+	if (S_ISLNK(inode->i_mode))
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+		kfree(inode->i_link);
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+	free_inode_nonrcu(inode);
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+}
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+
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 static const struct super_operations configfs_ops = {
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 	.statfs		= simple_statfs,
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 	.drop_inode	= generic_delete_inode,
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+	.free_inode	= configfs_free_inode,
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 };
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 static struct config_group configfs_root_group = {
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@@ -66,7 +62,7 @@
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 	.s_iattr	= NULL,
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 };
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-static int configfs_fill_super(struct super_block *sb, void *data, int silent)
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+static int configfs_fill_super(struct super_block *sb, struct fs_context *fc)
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 {
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 	struct inode *inode;
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 	struct dentry *root;
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@@ -102,16 +98,25 @@
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 	return 0;
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 }
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-static struct dentry *configfs_do_mount(struct file_system_type *fs_type,
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-	int flags, const char *dev_name, void *data)
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+static int configfs_get_tree(struct fs_context *fc)
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 {
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-	return mount_single(fs_type, flags, data, configfs_fill_super);
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+	return get_tree_single(fc, configfs_fill_super);
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+}
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+
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+static const struct fs_context_operations configfs_context_ops = {
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+	.get_tree	= configfs_get_tree,
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+};
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+
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+static int configfs_init_fs_context(struct fs_context *fc)
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+{
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+	fc->ops = &configfs_context_ops;
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+	return 0;
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 }
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 static struct file_system_type configfs_fs_type = {
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 	.owner		= THIS_MODULE,
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 	.name		= "configfs",
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-	.mount		= configfs_do_mount,
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+	.init_fs_context = configfs_init_fs_context,
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 	.kill_sb	= kill_litter_super,
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 };
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 MODULE_ALIAS_FS("configfs");
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@@ -168,6 +173,7 @@
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 MODULE_AUTHOR("Oracle");
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 MODULE_LICENSE("GPL");
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+MODULE_IMPORT_NS(VFS_internal_I_am_really_a_filesystem_and_am_NOT_a_driver);
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 MODULE_VERSION("0.0.2");
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 MODULE_DESCRIPTION("Simple RAM filesystem for user driven kernel subsystem configuration.");
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