add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/fs/efivarfs/file.c
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@@ -1,10 +1,7 @@
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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/efi.h>
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@@ -54,6 +51,7 @@
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 	} else {
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 		inode_lock(inode);
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 		i_size_write(inode, datasize + sizeof(attributes));
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+		inode->i_mtime = current_time(inode);
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 		inode_unlock(inode);
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 	}
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..
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@@ -75,10 +73,8 @@
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 	ssize_t size = 0;
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 	int err;
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-	while (!__ratelimit(&file->f_cred->user->ratelimit)) {
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-		if (!msleep_interruptible(50))
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-			return -EINTR;
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-	}
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+	while (!__ratelimit(&file->f_cred->user->ratelimit))
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+		msleep(50);
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 	err = efivar_entry_size(var, &datasize);
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@@ -110,16 +106,22 @@
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 	return size;
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 }
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-static int
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-efivarfs_ioc_getxflags(struct file *file, void __user *arg)
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+static inline unsigned int efivarfs_getflags(struct inode *inode)
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 {
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-	struct inode *inode = file->f_mapping->host;
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 	unsigned int i_flags;
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 	unsigned int flags = 0;
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 	i_flags = inode->i_flags;
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 	if (i_flags & S_IMMUTABLE)
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 		flags |= FS_IMMUTABLE_FL;
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+	return flags;
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+}
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+
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+static int
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+efivarfs_ioc_getxflags(struct file *file, void __user *arg)
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+{
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+	struct inode *inode = file->f_mapping->host;
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+	unsigned int flags = efivarfs_getflags(inode);
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 	if (copy_to_user(arg, &flags, sizeof(flags)))
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 		return -EFAULT;
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@@ -132,6 +134,7 @@
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 	struct inode *inode = file->f_mapping->host;
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 	unsigned int flags;
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 	unsigned int i_flags = 0;
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+	unsigned int oldflags = efivarfs_getflags(inode);
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 	int error;
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 	if (!inode_owner_or_capable(inode))
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@@ -143,9 +146,6 @@
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 	if (flags & ~FS_IMMUTABLE_FL)
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 		return -EOPNOTSUPP;
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-	if (!capable(CAP_LINUX_IMMUTABLE))
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-		return -EPERM;
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-
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 	if (flags & FS_IMMUTABLE_FL)
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 		i_flags |= S_IMMUTABLE;
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..
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@@ -155,12 +155,16 @@
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 		return error;
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 	inode_lock(inode);
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+
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+	error = vfs_ioc_setflags_prepare(inode, oldflags, flags);
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+	if (error)
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+		goto out;
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+
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 	inode_set_flags(inode, i_flags, S_IMMUTABLE);
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+out:
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 	inode_unlock(inode);
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-
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 	mnt_drop_write_file(file);
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-
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-	return 0;
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+	return error;
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 }
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 static long