1 // SPDX-License-Identifier: GPL-2.0-only
29 	case EFIVAR_OPS_RDONLY:  in efivarfs_ops_notifier()
30 		sfi->sb->s_flags |= SB_RDONLY;  in efivarfs_ops_notifier()
32 	case EFIVAR_OPS_RDWR:  in efivarfs_ops_notifier()
33 		sfi->sb->s_flags &= ~SB_RDONLY;  in efivarfs_ops_notifier()
49 	struct super_block *sb = root->d_sb;  in efivarfs_show_options()
50 	struct efivarfs_fs_info *sbi = sb->s_fs_info;  in efivarfs_show_options()
51 	struct efivarfs_mount_opts *opts = &sbi->mount_opts;  in efivarfs_show_options()
53 	if (!uid_eq(opts->uid, GLOBAL_ROOT_UID))  in efivarfs_show_options()
55 				from_kuid_munged(&init_user_ns, opts->uid));  in efivarfs_show_options()
56 	if (!gid_eq(opts->gid, GLOBAL_ROOT_GID))  in efivarfs_show_options()
58 				from_kgid_munged(&init_user_ns, opts->gid));  in efivarfs_show_options()
68 	u64 id = huge_encode_dev(dentry->d_sb->s_dev);  in efivarfs_statfs()
87 	buf->f_bsize	= 1;  in efivarfs_statfs()
88 	buf->f_namelen	= NAME_MAX;  in efivarfs_statfs()
89 	buf->f_blocks	= storage_space;  in efivarfs_statfs()
90 	buf->f_bfree	= remaining_space;  in efivarfs_statfs()
91 	buf->f_type	= dentry->d_sb->s_magic;  in efivarfs_statfs()
92 	buf->f_fsid	= u64_to_fsid(id);  in efivarfs_statfs()
100 		buf->f_bavail = remaining_space - efivar_reserved_space();  in efivarfs_statfs()
102 		buf->f_bavail = 0;  in efivarfs_statfs()
118  *	1. A case-sensitive variable name
119  *	2. A case-insensitive GUID
121  * So we need to perform a case-sensitive match on part 1 and a
122  * case-insensitive match on part 2.
128 	int guid = len - EFI_VARIABLE_GUID_LEN;  in efivarfs_d_compare()
130 	if (name->len != len)  in efivarfs_d_compare()
133 	/* Case-sensitive compare for the variable name */  in efivarfs_d_compare()
134 	if (memcmp(str, name->name, guid))  in efivarfs_d_compare()
137 	/* Case-insensitive compare for the GUID */  in efivarfs_d_compare()
138 	return strncasecmp(name->name + guid, str + guid, EFI_VARIABLE_GUID_LEN);  in efivarfs_d_compare()
144 	const unsigned char *s = qstr->name;  in efivarfs_d_hash()
145 	unsigned int len = qstr->len;  in efivarfs_d_hash()
148 		return -EINVAL;  in efivarfs_d_hash()
150 	while (len-- > EFI_VARIABLE_GUID_LEN)  in efivarfs_d_hash()
153 	/* GUID is case-insensitive. */  in efivarfs_d_hash()
154 	while (len--)  in efivarfs_d_hash()
157 	qstr->hash = end_name_hash(hash);  in efivarfs_d_hash()
184 	return ERR_PTR(-ENOMEM);  in efivarfs_alloc_dentry()
194 	struct dentry *dentry, *root = sb->s_root;  in efivarfs_callback()
198 	int err = -ENOMEM;  in efivarfs_callback()
208 	memcpy(entry->var.VariableName, name16, name_size);  in efivarfs_callback()
209 	memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));  in efivarfs_callback()
211 	len = ucs2_utf8size(entry->var.VariableName);  in efivarfs_callback()
213 	/* name, plus '-', plus GUID, plus NUL*/  in efivarfs_callback()
218 	ucs2_as_utf8(name, entry->var.VariableName, len);  in efivarfs_callback()
220 	if (efivar_variable_is_removable(entry->var.VendorGuid, name, len))  in efivarfs_callback()
223 	name[len] = '-';  in efivarfs_callback()
225 	efi_guid_to_str(&entry->var.VendorGuid, name + len + 1);  in efivarfs_callback()
250 	inode->i_private = entry;  in efivarfs_callback()
251 	i_size_write(inode, size + sizeof(entry->var.Attributes));  in efivarfs_callback()
285 	struct efivarfs_fs_info *sbi = fc->s_fs_info;  in efivarfs_parse_param()
286 	struct efivarfs_mount_opts *opts = &sbi->mount_opts;  in efivarfs_parse_param()
295 	case Opt_uid:  in efivarfs_parse_param()
296 		opts->uid = result.uid;  in efivarfs_parse_param()
298 	case Opt_gid:  in efivarfs_parse_param()
299 		opts->gid = result.gid;  in efivarfs_parse_param()
302 		return -EINVAL;  in efivarfs_parse_param()
310 	struct efivarfs_fs_info *sfi = sb->s_fs_info;  in efivarfs_fill_super()
315 	sb->s_maxbytes          = MAX_LFS_FILESIZE;  in efivarfs_fill_super()
316 	sb->s_blocksize         = PAGE_SIZE;  in efivarfs_fill_super()
317 	sb->s_blocksize_bits    = PAGE_SHIFT;  in efivarfs_fill_super()
318 	sb->s_magic             = EFIVARFS_MAGIC;  in efivarfs_fill_super()
319 	sb->s_op                = &efivarfs_ops;  in efivarfs_fill_super()
320 	sb->s_d_op		= &efivarfs_d_ops;  in efivarfs_fill_super()
321 	sb->s_time_gran         = 1;  in efivarfs_fill_super()
324 		sb->s_flags |= SB_RDONLY;  in efivarfs_fill_super()
328 		return -ENOMEM;  in efivarfs_fill_super()
329 	inode->i_op = &efivarfs_dir_inode_operations;  in efivarfs_fill_super()
332 	sb->s_root = root;  in efivarfs_fill_super()
334 		return -ENOMEM;  in efivarfs_fill_super()
336 	sfi->sb = sb;  in efivarfs_fill_super()
337 	sfi->nb.notifier_call = efivarfs_ops_notifier;  in efivarfs_fill_super()
338 	err = blocking_notifier_chain_register(&efivar_ops_nh, &sfi->nb);  in efivarfs_fill_super()
342 	return efivar_init(efivarfs_callback, sb, &sfi->efivarfs_list);  in efivarfs_fill_super()
352 	if (!efivar_supports_writes() && !(fc->sb_flags & SB_RDONLY)) {  in efivarfs_reconfigure()
354 		return -EINVAL;  in efivarfs_reconfigure()
371 		return -EOPNOTSUPP;  in efivarfs_init_fs_context()
375 		return -ENOMEM;  in efivarfs_init_fs_context()
377 	INIT_LIST_HEAD(&sfi->efivarfs_list);  in efivarfs_init_fs_context()
379 	sfi->mount_opts.uid = GLOBAL_ROOT_UID;  in efivarfs_init_fs_context()
380 	sfi->mount_opts.gid = GLOBAL_ROOT_GID;  in efivarfs_init_fs_context()
382 	fc->s_fs_info = sfi;  in efivarfs_init_fs_context()
383 	fc->ops = &efivarfs_context_ops;  in efivarfs_init_fs_context()
389 	struct efivarfs_fs_info *sfi = sb->s_fs_info;  in efivarfs_kill_sb()
391 	blocking_notifier_chain_unregister(&efivar_ops_nh, &sfi->nb);  in efivarfs_kill_sb()
395 	efivar_entry_iter(efivarfs_destroy, &sfi->efivarfs_list, NULL);  in efivarfs_kill_sb()