diff options
author | Matt Fleming <matt.fleming@intel.com> | 2013-02-08 17:27:24 +0100 |
---|---|---|
committer | Matt Fleming <matt.fleming@intel.com> | 2013-04-17 14:25:09 +0200 |
commit | d68772b7c83f4b518be15ae96f4827c8ed02f684 (patch) | |
tree | b3408a750976edf6e0b62bfce3e26d1c9685a907 /drivers/firmware/efivars.c | |
parent | efivars: Move pstore code into the new EFI directory (diff) | |
download | linux-d68772b7c83f4b518be15ae96f4827c8ed02f684.tar.xz linux-d68772b7c83f4b518be15ae96f4827c8ed02f684.zip |
efivarfs: Move to fs/efivarfs
Now that efivarfs uses the efivar API, move it out of efivars.c and
into fs/efivarfs where it belongs. This move will eventually allow us
to enable the efivarfs code without having to also enable
CONFIG_EFI_VARS built, and vice versa.
Furthermore, things like,
mount -t efivarfs none /sys/firmware/efi/efivars
will now work if efivarfs is built as a module without requiring the
use of MODULE_ALIAS(), which would have been necessary when the
efivarfs code was part of efivars.c.
Cc: Matthew Garrett <matthew.garrett@nebula.com>
Cc: Jeremy Kerr <jk@ozlabs.org>
Reviewed-by: Tom Gundersen <teg@jklm.no>
Tested-by: Tom Gundersen <teg@jklm.no>
Signed-off-by: Matt Fleming <matt.fleming@intel.com>
Diffstat (limited to 'drivers/firmware/efivars.c')
-rw-r--r-- | drivers/firmware/efivars.c | 496 |
1 files changed, 0 insertions, 496 deletions
diff --git a/drivers/firmware/efivars.c b/drivers/firmware/efivars.c index 5e7c3b1acde9..af396758482f 100644 --- a/drivers/firmware/efivars.c +++ b/drivers/firmware/efivars.c @@ -94,7 +94,6 @@ MODULE_DESCRIPTION("sysfs interface to EFI Variables"); MODULE_LICENSE("GPL"); MODULE_VERSION(EFIVARS_VERSION); -static LIST_HEAD(efivarfs_list); LIST_HEAD(efivar_sysfs_list); EXPORT_SYMBOL_GPL(efivar_sysfs_list); @@ -558,12 +557,6 @@ static struct kobj_type efivar_ktype = { .default_attrs = def_attrs, }; -static int efivarfs_file_open(struct inode *inode, struct file *file) -{ - file->private_data = inode->i_private; - return 0; -} - static int efi_status_to_err(efi_status_t status) { int err; @@ -597,493 +590,6 @@ static int efi_status_to_err(efi_status_t status) return err; } -static ssize_t efivarfs_file_write(struct file *file, - const char __user *userbuf, size_t count, loff_t *ppos) -{ - struct efivar_entry *var = file->private_data; - void *data; - u32 attributes; - struct inode *inode = file->f_mapping->host; - unsigned long datasize = count - sizeof(attributes); - ssize_t bytes = 0; - bool set = false; - - if (count < sizeof(attributes)) - return -EINVAL; - - if (copy_from_user(&attributes, userbuf, sizeof(attributes))) - return -EFAULT; - - if (attributes & ~(EFI_VARIABLE_MASK)) - return -EINVAL; - - data = kmalloc(datasize, GFP_KERNEL); - if (!data) - return -ENOMEM; - - if (copy_from_user(data, userbuf + sizeof(attributes), datasize)) { - bytes = -EFAULT; - goto out; - } - - bytes = efivar_entry_set_get_size(var, attributes, &datasize, - data, &set); - if (!set && bytes) - goto out; - - if (!bytes) { - mutex_lock(&inode->i_mutex); - i_size_write(inode, datasize + sizeof(attributes)); - mutex_unlock(&inode->i_mutex); - } else if (bytes == -ENOENT) { - drop_nlink(inode); - d_delete(file->f_dentry); - dput(file->f_dentry); - } else - pr_warn("efivarfs: inconsistent EFI variable implementation? " - "status=%zu\n", bytes); - - bytes = count; - -out: - kfree(data); - - return bytes; -} - -static ssize_t efivarfs_file_read(struct file *file, char __user *userbuf, - size_t count, loff_t *ppos) -{ - struct efivar_entry *var = file->private_data; - unsigned long datasize = 0; - u32 attributes; - void *data; - ssize_t size = 0; - int err; - - err = efivar_entry_size(var, &datasize); - if (err) - return err; - - data = kmalloc(datasize + sizeof(attributes), GFP_KERNEL); - - if (!data) - return -ENOMEM; - - size = efivar_entry_get(var, &attributes, &datasize, - data + sizeof(attributes)); - if (size) - goto out_free; - - memcpy(data, &attributes, sizeof(attributes)); - size = simple_read_from_buffer(userbuf, count, ppos, - data, datasize + sizeof(attributes)); -out_free: - kfree(data); - - return size; -} - -static void efivarfs_evict_inode(struct inode *inode) -{ - clear_inode(inode); -} - -static const struct super_operations efivarfs_ops = { - .statfs = simple_statfs, - .drop_inode = generic_delete_inode, - .evict_inode = efivarfs_evict_inode, - .show_options = generic_show_options, -}; - -static struct super_block *efivarfs_sb; - -static const struct inode_operations efivarfs_dir_inode_operations; - -static const struct file_operations efivarfs_file_operations = { - .open = efivarfs_file_open, - .read = efivarfs_file_read, - .write = efivarfs_file_write, - .llseek = no_llseek, -}; - -static struct inode *efivarfs_get_inode(struct super_block *sb, - const struct inode *dir, int mode, dev_t dev) -{ - struct inode *inode = new_inode(sb); - - if (inode) { - inode->i_ino = get_next_ino(); - inode->i_mode = mode; - inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME; - switch (mode & S_IFMT) { - case S_IFREG: - inode->i_fop = &efivarfs_file_operations; - break; - case S_IFDIR: - inode->i_op = &efivarfs_dir_inode_operations; - inode->i_fop = &simple_dir_operations; - inc_nlink(inode); - break; - } - } - return inode; -} - -/* - * Return true if 'str' is a valid efivarfs filename of the form, - * - * VariableName-12345678-1234-1234-1234-1234567891bc - */ -static bool efivarfs_valid_name(const char *str, int len) -{ - static const char dashes[EFI_VARIABLE_GUID_LEN] = { - [8] = 1, [13] = 1, [18] = 1, [23] = 1 - }; - const char *s = str + len - EFI_VARIABLE_GUID_LEN; - int i; - - /* - * We need a GUID, plus at least one letter for the variable name, - * plus the '-' separator - */ - if (len < EFI_VARIABLE_GUID_LEN + 2) - return false; - - /* GUID must be preceded by a '-' */ - if (*(s - 1) != '-') - return false; - - /* - * Validate that 's' is of the correct format, e.g. - * - * 12345678-1234-1234-1234-123456789abc - */ - for (i = 0; i < EFI_VARIABLE_GUID_LEN; i++) { - if (dashes[i]) { - if (*s++ != '-') - return false; - } else { - if (!isxdigit(*s++)) - return false; - } - } - - return true; -} - -static void efivarfs_hex_to_guid(const char *str, efi_guid_t *guid) -{ - guid->b[0] = hex_to_bin(str[6]) << 4 | hex_to_bin(str[7]); - guid->b[1] = hex_to_bin(str[4]) << 4 | hex_to_bin(str[5]); - guid->b[2] = hex_to_bin(str[2]) << 4 | hex_to_bin(str[3]); - guid->b[3] = hex_to_bin(str[0]) << 4 | hex_to_bin(str[1]); - guid->b[4] = hex_to_bin(str[11]) << 4 | hex_to_bin(str[12]); - guid->b[5] = hex_to_bin(str[9]) << 4 | hex_to_bin(str[10]); - guid->b[6] = hex_to_bin(str[16]) << 4 | hex_to_bin(str[17]); - guid->b[7] = hex_to_bin(str[14]) << 4 | hex_to_bin(str[15]); - guid->b[8] = hex_to_bin(str[19]) << 4 | hex_to_bin(str[20]); - guid->b[9] = hex_to_bin(str[21]) << 4 | hex_to_bin(str[22]); - guid->b[10] = hex_to_bin(str[24]) << 4 | hex_to_bin(str[25]); - guid->b[11] = hex_to_bin(str[26]) << 4 | hex_to_bin(str[27]); - guid->b[12] = hex_to_bin(str[28]) << 4 | hex_to_bin(str[29]); - guid->b[13] = hex_to_bin(str[30]) << 4 | hex_to_bin(str[31]); - guid->b[14] = hex_to_bin(str[32]) << 4 | hex_to_bin(str[33]); - guid->b[15] = hex_to_bin(str[34]) << 4 | hex_to_bin(str[35]); -} - -static int efivarfs_create(struct inode *dir, struct dentry *dentry, - umode_t mode, bool excl) -{ - struct inode *inode; - struct efivar_entry *var; - int namelen, i = 0, err = 0; - - if (!efivarfs_valid_name(dentry->d_name.name, dentry->d_name.len)) - return -EINVAL; - - inode = efivarfs_get_inode(dir->i_sb, dir, mode, 0); - if (!inode) - return -ENOMEM; - - var = kzalloc(sizeof(struct efivar_entry), GFP_KERNEL); - if (!var) { - err = -ENOMEM; - goto out; - } - - /* length of the variable name itself: remove GUID and separator */ - namelen = dentry->d_name.len - EFI_VARIABLE_GUID_LEN - 1; - - efivarfs_hex_to_guid(dentry->d_name.name + namelen + 1, - &var->var.VendorGuid); - - for (i = 0; i < namelen; i++) - var->var.VariableName[i] = dentry->d_name.name[i]; - - var->var.VariableName[i] = '\0'; - - inode->i_private = var; - - efivar_entry_add(var, &efivarfs_list); - d_instantiate(dentry, inode); - dget(dentry); -out: - if (err) { - kfree(var); - iput(inode); - } - return err; -} - -static int efivarfs_unlink(struct inode *dir, struct dentry *dentry) -{ - struct efivar_entry *var = dentry->d_inode->i_private; - - if (efivar_entry_delete(var)) - return -EINVAL; - - drop_nlink(dentry->d_inode); - dput(dentry); - return 0; -}; - -/* - * Compare two efivarfs file names. - * - * An efivarfs filename is composed of two parts, - * - * 1. A case-sensitive variable name - * 2. A case-insensitive GUID - * - * So we need to perform a case-sensitive match on part 1 and a - * case-insensitive match on part 2. - */ -static int efivarfs_d_compare(const struct dentry *parent, const struct inode *pinode, - const struct dentry *dentry, const struct inode *inode, - unsigned int len, const char *str, - const struct qstr *name) -{ - int guid = len - EFI_VARIABLE_GUID_LEN; - - if (name->len != len) - return 1; - - /* Case-sensitive compare for the variable name */ - if (memcmp(str, name->name, guid)) - return 1; - - /* Case-insensitive compare for the GUID */ - return strncasecmp(name->name + guid, str + guid, EFI_VARIABLE_GUID_LEN); -} - -static int efivarfs_d_hash(const struct dentry *dentry, - const struct inode *inode, struct qstr *qstr) -{ - unsigned long hash = init_name_hash(); - const unsigned char *s = qstr->name; - unsigned int len = qstr->len; - - if (!efivarfs_valid_name(s, len)) - return -EINVAL; - - while (len-- > EFI_VARIABLE_GUID_LEN) - hash = partial_name_hash(*s++, hash); - - /* GUID is case-insensitive. */ - while (len--) - hash = partial_name_hash(tolower(*s++), hash); - - qstr->hash = end_name_hash(hash); - return 0; -} - -/* - * Retaining negative dentries for an in-memory filesystem just wastes - * memory and lookup time: arrange for them to be deleted immediately. - */ -static int efivarfs_delete_dentry(const struct dentry *dentry) -{ - return 1; -} - -static struct dentry_operations efivarfs_d_ops = { - .d_compare = efivarfs_d_compare, - .d_hash = efivarfs_d_hash, - .d_delete = efivarfs_delete_dentry, -}; - -static struct dentry *efivarfs_alloc_dentry(struct dentry *parent, char *name) -{ - struct dentry *d; - struct qstr q; - int err; - - q.name = name; - q.len = strlen(name); - - err = efivarfs_d_hash(NULL, NULL, &q); - if (err) - return ERR_PTR(err); - - d = d_alloc(parent, &q); - if (d) - return d; - - return ERR_PTR(-ENOMEM); -} - -static int efivarfs_callback(efi_char16_t *name16, efi_guid_t vendor, - unsigned long name_size, void *data) -{ - struct super_block *sb = (struct super_block *)data; - struct efivar_entry *entry; - struct inode *inode = NULL; - struct dentry *dentry, *root = sb->s_root; - unsigned long size = 0; - char *name; - int len, i; - int err = -ENOMEM; - - entry = kmalloc(sizeof(*entry), GFP_KERNEL); - if (!entry) - return err; - - memcpy(entry->var.VariableName, name16, name_size); - memcpy(&(entry->var.VendorGuid), &vendor, sizeof(efi_guid_t)); - - len = utf16_strlen(entry->var.VariableName); - - /* name, plus '-', plus GUID, plus NUL*/ - name = kmalloc(len + 1 + EFI_VARIABLE_GUID_LEN + 1, GFP_KERNEL); - if (!name) - goto fail; - - for (i = 0; i < len; i++) - name[i] = entry->var.VariableName[i] & 0xFF; - - name[len] = '-'; - - efi_guid_unparse(&entry->var.VendorGuid, name + len + 1); - - name[len + EFI_VARIABLE_GUID_LEN+1] = '\0'; - - inode = efivarfs_get_inode(sb, root->d_inode, S_IFREG | 0644, 0); - if (!inode) - goto fail_name; - - dentry = efivarfs_alloc_dentry(root, name); - if (IS_ERR(dentry)) { - err = PTR_ERR(dentry); - goto fail_inode; - } - - /* copied by the above to local storage in the dentry. */ - kfree(name); - - efivar_entry_size(entry, &size); - efivar_entry_add(entry, &efivarfs_list); - - mutex_lock(&inode->i_mutex); - inode->i_private = entry; - i_size_write(inode, size + sizeof(entry->var.Attributes)); - mutex_unlock(&inode->i_mutex); - d_add(dentry, inode); - - return 0; - -fail_inode: - iput(inode); -fail_name: - kfree(name); -fail: - kfree(entry); - return err; -} - -static int efivarfs_destroy(struct efivar_entry *entry, void *data) -{ - efivar_entry_remove(entry); - kfree(entry); - return 0; -} - -static int efivarfs_fill_super(struct super_block *sb, void *data, int silent) -{ - struct inode *inode = NULL; - struct dentry *root; - int err; - - efivarfs_sb = sb; - - sb->s_maxbytes = MAX_LFS_FILESIZE; - sb->s_blocksize = PAGE_CACHE_SIZE; - sb->s_blocksize_bits = PAGE_CACHE_SHIFT; - sb->s_magic = EFIVARFS_MAGIC; - sb->s_op = &efivarfs_ops; - sb->s_d_op = &efivarfs_d_ops; - sb->s_time_gran = 1; - - inode = efivarfs_get_inode(sb, NULL, S_IFDIR | 0755, 0); - if (!inode) - return -ENOMEM; - inode->i_op = &efivarfs_dir_inode_operations; - - root = d_make_root(inode); - sb->s_root = root; - if (!root) - return -ENOMEM; - - INIT_LIST_HEAD(&efivarfs_list); - - err = efivar_init(efivarfs_callback, (void *)sb, false, - true, &efivarfs_list); - if (err) - __efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL); - - return err; -} - -static struct dentry *efivarfs_mount(struct file_system_type *fs_type, - int flags, const char *dev_name, void *data) -{ - return mount_single(fs_type, flags, data, efivarfs_fill_super); -} - -static void efivarfs_kill_sb(struct super_block *sb) -{ - kill_litter_super(sb); - efivarfs_sb = NULL; - - /* Remove all entries and destroy */ - __efivar_entry_iter(efivarfs_destroy, &efivarfs_list, NULL, NULL); -} - -static struct file_system_type efivarfs_type = { - .name = "efivarfs", - .mount = efivarfs_mount, - .kill_sb = efivarfs_kill_sb, -}; -MODULE_ALIAS_FS("efivarfs"); - -/* - * Handle negative dentry. - */ -static struct dentry *efivarfs_lookup(struct inode *dir, struct dentry *dentry, - unsigned int flags) -{ - if (dentry->d_name.len > NAME_MAX) - return ERR_PTR(-ENAMETOOLONG); - d_add(dentry, NULL); - return NULL; -} - -static const struct inode_operations efivarfs_dir_inode_operations = { - .lookup = efivarfs_lookup, - .unlink = efivarfs_unlink, - .create = efivarfs_create, -}; - static ssize_t efivar_create(struct file *filp, struct kobject *kobj, struct bin_attribute *bin_attr, char *buf, loff_t pos, size_t count) @@ -2164,8 +1670,6 @@ int efivars_register(struct efivars *efivars, __efivars = efivars; - register_filesystem(&efivarfs_type); - return 0; } EXPORT_SYMBOL_GPL(efivars_register); |