1 // SPDX-License-Identifier: GPL-2.0-only
52 	buf->f_bsize	= 1;  in efivarfs_statfs()
53 	buf->f_namelen	= NAME_MAX;  in efivarfs_statfs()
54 	buf->f_blocks	= storage_space;  in efivarfs_statfs()
55 	buf->f_bfree	= remaining_space;  in efivarfs_statfs()
56 	buf->f_type	= dentry->d_sb->s_magic;  in efivarfs_statfs()
64 		buf->f_bavail = remaining_space - efivar_reserved_space();  in efivarfs_statfs()
66 		buf->f_bavail = 0;  in efivarfs_statfs()
81  *	1. A case-sensitive variable name
82  *	2. A case-insensitive GUID
84  * So we need to perform a case-sensitive match on part 1 and a
85  * case-insensitive match on part 2.
89 			      const struct qstr *name)  in efivarfs_d_compare()  argument
91 	int guid = len - EFI_VARIABLE_GUID_LEN;  in efivarfs_d_compare()
93 	if (name->len != len)  in efivarfs_d_compare()
96 	/* Case-sensitive compare for the variable name */  in efivarfs_d_compare()
97 	if (memcmp(str, name->name, guid))  in efivarfs_d_compare()
100 	/* Case-insensitive compare for the GUID */  in efivarfs_d_compare()
101 	return strncasecmp(name->name + guid, str + guid, EFI_VARIABLE_GUID_LEN);  in efivarfs_d_compare()
107 	const unsigned char *s = qstr->name;  in efivarfs_d_hash()
108 	unsigned int len = qstr->len;  in efivarfs_d_hash()
110 	while (len-- > EFI_VARIABLE_GUID_LEN)  in efivarfs_d_hash()
113 	/* GUID is case-insensitive. */  in efivarfs_d_hash()
114 	while (len--)  in efivarfs_d_hash()
117 	qstr->hash = end_name_hash(hash);  in efivarfs_d_hash()
127 static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name)  in efivarfs_alloc_dentry()  argument
133 	q.name = name;  in efivarfs_alloc_dentry()
134 	q.len = strlen(name);  in efivarfs_alloc_dentry()
144 	return ERR_PTR(-ENOMEM);  in efivarfs_alloc_dentry()
151 	struct efivar_entry *entry;  in efivarfs_callback()  local
153 	struct dentry *dentry, *root = sb->s_root;  in efivarfs_callback()
155 	char *name;  in efivarfs_callback()  local
157 	int err = -ENOMEM;  in efivarfs_callback()
163 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);  in efivarfs_callback()
164 	if (!entry)  in efivarfs_callback()
167 	memcpy(entry->var.VariableName, name16, name_size);  in efivarfs_callback()
168 	memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));  in efivarfs_callback()
170 	len = ucs2_utf8size(entry->var.VariableName);  in efivarfs_callback()
172 	/* name, plus '-', plus GUID, plus NUL*/  in efivarfs_callback()
173 	name = kmalloc(len + 1 + EFI_VARIABLE_GUID_LEN + 1, GFP_KERNEL);  in efivarfs_callback()
174 	if (!name)  in efivarfs_callback()
177 	ucs2_as_utf8(name, entry->var.VariableName, len);  in efivarfs_callback()
179 	if (efivar_variable_is_removable(entry->var.VendorGuid, name, len))  in efivarfs_callback()
182 	name[len] = '-';  in efivarfs_callback()
184 	efi_guid_to_str(&entry->var.VendorGuid, name + len + 1);  in efivarfs_callback()
186 	name[len + EFI_VARIABLE_GUID_LEN+1] = '\0';  in efivarfs_callback()
189 	strreplace(name, '/', '!');  in efivarfs_callback()
196 	dentry = efivarfs_alloc_dentry(root, name);  in efivarfs_callback()
202 	__efivar_entry_get(entry, NULL, &size, NULL);  in efivarfs_callback()
203 	__efivar_entry_add(entry, &efivarfs_list);  in efivarfs_callback()
206 	kfree(name);  in efivarfs_callback()
209 	inode->i_private = entry;  in efivarfs_callback()
210 	i_size_write(inode, size + sizeof(entry->var.Attributes));  in efivarfs_callback()
219 	kfree(name);  in efivarfs_callback()
221 	kfree(entry);  in efivarfs_callback()
225 static int efivarfs_destroy(struct efivar_entry *entry, void *data)  in efivarfs_destroy()  argument
227 	efivar_entry_remove(entry);  in efivarfs_destroy()
228 	kfree(entry);  in efivarfs_destroy()
239 		return -EOPNOTSUPP;  in efivarfs_fill_super()
241 	sb->s_maxbytes          = MAX_LFS_FILESIZE;  in efivarfs_fill_super()
242 	sb->s_blocksize         = PAGE_SIZE;  in efivarfs_fill_super()
243 	sb->s_blocksize_bits    = PAGE_SHIFT;  in efivarfs_fill_super()
244 	sb->s_magic             = EFIVARFS_MAGIC;  in efivarfs_fill_super()
245 	sb->s_op                = &efivarfs_ops;  in efivarfs_fill_super()
246 	sb->s_d_op		= &efivarfs_d_ops;  in efivarfs_fill_super()
247 	sb->s_time_gran         = 1;  in efivarfs_fill_super()
250 		sb->s_flags |= SB_RDONLY;  in efivarfs_fill_super()
254 		return -ENOMEM;  in efivarfs_fill_super()
255 	inode->i_op = &efivarfs_dir_inode_operations;  in efivarfs_fill_super()
258 	sb->s_root = root;  in efivarfs_fill_super()
260 		return -ENOMEM;  in efivarfs_fill_super()
278 	if (!efivar_supports_writes() && !(fc->sb_flags & SB_RDONLY)) {  in efivarfs_reconfigure()
280 		return -EINVAL;  in efivarfs_reconfigure()
293 	fc->ops = &efivarfs_context_ops;  in efivarfs_init_fs_context()
299 	struct efivarfs_fs_info *sfi = sb->s_fs_info;  in efivarfs_kill_sb()
313 	.name    = "efivarfs",