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2024-05-10 748e4f3d702def1a4bff191e0cf93b6a05340f01

 kernel/fs/efivarfs/super.c
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@@ -1,15 +1,13 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Copyright (C) 2012 Red Hat, Inc.
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  * Copyright (C) 2012 Jeremy Kerr <jeremy.kerr@canonical.com>
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- *
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- * This program is free software; you can redistribute it and/or modify
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- * it under the terms of the GNU General Public License version 2 as
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- * published by the Free Software Foundation.
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  */
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 #include <linux/ctype.h>
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 #include <linux/efi.h>
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 #include <linux/fs.h>
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+#include <linux/fs_context.h>
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 #include <linux/module.h>
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 #include <linux/pagemap.h>
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 #include <linux/ucs2_string.h>
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@@ -30,8 +28,6 @@
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 	.drop_inode = generic_delete_inode,
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 	.evict_inode = efivarfs_evict_inode,
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 };
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-
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-static struct super_block *efivarfs_sb;
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 /*
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  * Compare two efivarfs file names.
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@@ -194,13 +190,11 @@
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 	return 0;
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 }
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-static int efivarfs_fill_super(struct super_block *sb, void *data, int silent)
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+static int efivarfs_fill_super(struct super_block *sb, struct fs_context *fc)
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 {
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 	struct inode *inode = NULL;
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 	struct dentry *root;
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 	int err;
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-
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-	efivarfs_sb = sb;
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 	sb->s_maxbytes          = MAX_LFS_FILESIZE;
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 	sb->s_blocksize         = PAGE_SIZE;
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@@ -209,6 +203,9 @@
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 	sb->s_op                = &efivarfs_ops;
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 	sb->s_d_op		= &efivarfs_d_ops;
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 	sb->s_time_gran         = 1;
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+
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+	if (!efivar_supports_writes())
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+		sb->s_flags |= SB_RDONLY;
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 	inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0, true);
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 	if (!inode)
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@@ -229,16 +226,24 @@
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 	return err;
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 }
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-static struct dentry *efivarfs_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 efivarfs_get_tree(struct fs_context *fc)
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 {
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-	return mount_single(fs_type, flags, data, efivarfs_fill_super);
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+	return get_tree_single(fc, efivarfs_fill_super);
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+}
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+
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+static const struct fs_context_operations efivarfs_context_ops = {
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+	.get_tree	= efivarfs_get_tree,
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+};
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+
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+static int efivarfs_init_fs_context(struct fs_context *fc)
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+{
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+	fc->ops = &efivarfs_context_ops;
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+	return 0;
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 }
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 static void efivarfs_kill_sb(struct super_block *sb)
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 {
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 	kill_litter_super(sb);
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-	efivarfs_sb = NULL;
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 	/* Remove all entries and destroy */
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 	__efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL);
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@@ -247,15 +252,12 @@
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 static struct file_system_type efivarfs_type = {
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 	.owner   = THIS_MODULE,
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 	.name    = "efivarfs",
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-	.mount   = efivarfs_mount,
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+	.init_fs_context = efivarfs_init_fs_context,
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 	.kill_sb = efivarfs_kill_sb,
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 };
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 static __init int efivarfs_init(void)
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 {
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-	if (!efi_enabled(EFI_RUNTIME_SERVICES))
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-		return -ENODEV;
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-
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 	if (!efivars_kobject())
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 		return -ENODEV;
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@@ -270,6 +272,7 @@
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 MODULE_AUTHOR("Matthew Garrett, Jeremy Kerr");
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 MODULE_DESCRIPTION("EFI Variable Filesystem");
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 MODULE_LICENSE("GPL");
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+MODULE_IMPORT_NS(ANDROID_GKI_VFS_EXPORT_ONLY);
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 MODULE_ALIAS_FS("efivarfs");
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 module_init(efivarfs_init);