1 // SPDX-License-Identifier: GPL-2.0-only
37  *	1. A case-sensitive variable name
38  *	2. A case-insensitive GUID
40  * So we need to perform a case-sensitive match on part 1 and a
41  * case-insensitive match on part 2.
45 			      const struct qstr *name)  in efivarfs_d_compare()  argument
47 	int guid = len - EFI_VARIABLE_GUID_LEN;  in efivarfs_d_compare()
49 	if (name->len != len)  in efivarfs_d_compare()
52 	/* Case-sensitive compare for the variable name */  in efivarfs_d_compare()
53 	if (memcmp(str, name->name, guid))  in efivarfs_d_compare()
56 	/* Case-insensitive compare for the GUID */  in efivarfs_d_compare()
57 	return strncasecmp(name->name + guid, str + guid, EFI_VARIABLE_GUID_LEN);  in efivarfs_d_compare()
63 	const unsigned char *s = qstr->name;  in efivarfs_d_hash()
64 	unsigned int len = qstr->len;  in efivarfs_d_hash()
67 		return -EINVAL;  in efivarfs_d_hash()
69 	while (len-- > EFI_VARIABLE_GUID_LEN)  in efivarfs_d_hash()
72 	/* GUID is case-insensitive. */  in efivarfs_d_hash()
73 	while (len--)  in efivarfs_d_hash()
76 	qstr->hash = end_name_hash(hash);  in efivarfs_d_hash()
86 static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name)  in efivarfs_alloc_dentry()  argument
92 	q.name = name;  in efivarfs_alloc_dentry()
93 	q.len = strlen(name);  in efivarfs_alloc_dentry()
103 	return ERR_PTR(-ENOMEM);  in efivarfs_alloc_dentry()
110 	struct efivar_entry *entry;  in efivarfs_callback()  local
112 	struct dentry *dentry, *root = sb->s_root;  in efivarfs_callback()
114 	char *name;  in efivarfs_callback()  local
116 	int err = -ENOMEM;  in efivarfs_callback()
119 	entry = kzalloc(sizeof(*entry), GFP_KERNEL);  in efivarfs_callback()
120 	if (!entry)  in efivarfs_callback()
123 	memcpy(entry->var.VariableName, name16, name_size);  in efivarfs_callback()
124 	memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t));  in efivarfs_callback()
126 	len = ucs2_utf8size(entry->var.VariableName);  in efivarfs_callback()
128 	/* name, plus '-', plus GUID, plus NUL*/  in efivarfs_callback()
129 	name = kmalloc(len + 1 + EFI_VARIABLE_GUID_LEN + 1, GFP_KERNEL);  in efivarfs_callback()
130 	if (!name)  in efivarfs_callback()
133 	ucs2_as_utf8(name, entry->var.VariableName, len);  in efivarfs_callback()
135 	if (efivar_variable_is_removable(entry->var.VendorGuid, name, len))  in efivarfs_callback()
138 	name[len] = '-';  in efivarfs_callback()
140 	efi_guid_to_str(&entry->var.VendorGuid, name + len + 1);  in efivarfs_callback()
142 	name[len + EFI_VARIABLE_GUID_LEN+1] = '\0';  in efivarfs_callback()
145 	strreplace(name, '/', '!');  in efivarfs_callback()
152 	dentry = efivarfs_alloc_dentry(root, name);  in efivarfs_callback()
158 	__efivar_entry_get(entry, NULL, &size, NULL);  in efivarfs_callback()
159 	__efivar_entry_add(entry, &efivarfs_list);  in efivarfs_callback()
162 	kfree(name);  in efivarfs_callback()
165 	inode->i_private = entry;  in efivarfs_callback()
166 	i_size_write(inode, size + sizeof(entry->var.Attributes));  in efivarfs_callback()
175 	kfree(name);  in efivarfs_callback()
177 	kfree(entry);  in efivarfs_callback()
181 static int efivarfs_destroy(struct efivar_entry *entry, void *data)  in efivarfs_destroy()  argument
183 	efivar_entry_remove(entry);  in efivarfs_destroy()
184 	kfree(entry);  in efivarfs_destroy()
194 	sb->s_maxbytes          = MAX_LFS_FILESIZE;  in efivarfs_fill_super()
195 	sb->s_blocksize         = PAGE_SIZE;  in efivarfs_fill_super()
196 	sb->s_blocksize_bits    = PAGE_SHIFT;  in efivarfs_fill_super()
197 	sb->s_magic             = EFIVARFS_MAGIC;  in efivarfs_fill_super()
198 	sb->s_op                = &efivarfs_ops;  in efivarfs_fill_super()
199 	sb->s_d_op		= &efivarfs_d_ops;  in efivarfs_fill_super()
200 	sb->s_time_gran         = 1;  in efivarfs_fill_super()
203 		sb->s_flags |= SB_RDONLY;  in efivarfs_fill_super()
207 		return -ENOMEM;  in efivarfs_fill_super()
208 	inode->i_op = &efivarfs_dir_inode_operations;  in efivarfs_fill_super()
211 	sb->s_root = root;  in efivarfs_fill_super()
213 		return -ENOMEM;  in efivarfs_fill_super()
235 	fc->ops = &efivarfs_context_ops;  in efivarfs_init_fs_context()
249 	.name    = "efivarfs",
257 		return -ENODEV;  in efivarfs_init()