fs: efivars: implement write support
Implement the standard FS ops for writing/manipulating efivars. Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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c296bef5ed
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105
fs/efivarfs.c
105
fs/efivarfs.c
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@ -126,6 +126,75 @@ static int efivarfs_parse_filename(const char *filename, efi_guid_t *vendor, s16
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return 0;
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}
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static int efivars_create(struct device_d *dev, const char *pathname, mode_t mode)
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{
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struct efivarfs_priv *priv = dev->priv;
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struct efivarfs_inode *inode;
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efi_guid_t vendor;
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efi_status_t efiret;
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u8 dummydata;
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char *name8;
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s16 *name;
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int ret;
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if (pathname[0] == '/')
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pathname++;
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/* deny creating files with other vendor GUID than our own */
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ret = efivarfs_parse_filename(pathname, &vendor, &name);
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if (ret)
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return -ENOENT;
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if (memcmp(&vendor, &EFI_BAREBOX_VENDOR_GUID, sizeof(efi_guid_t)))
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return -EPERM;
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inode = xzalloc(sizeof(*inode));
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inode->name = name;
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inode->vendor = vendor;
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name8 = strdup_wchar_to_char(inode->name);
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inode->full_name = asprintf("%s-%pUl", name8, &inode->vendor);
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free(name8);
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efiret = RT->set_variable(inode->name, &inode->vendor,
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EFI_VARIABLE_NON_VOLATILE |
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EFI_VARIABLE_BOOTSERVICE_ACCESS |
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EFI_VARIABLE_RUNTIME_ACCESS,
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1, &dummydata);
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if (EFI_ERROR(efiret)) {
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free(inode);
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return -efi_errno(efiret);
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}
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list_add_tail(&inode->node, &priv->inodes);
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return 0;
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}
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static int efivars_unlink(struct device_d *dev, const char *pathname)
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{
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struct efivarfs_priv *priv = dev->priv;
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struct efivarfs_inode *inode, *tmp;
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efi_status_t efiret;
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if (pathname[0] == '/')
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pathname++;
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list_for_each_entry_safe(inode, tmp, &priv->inodes, node) {
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if (!strcmp(inode->full_name, pathname)) {
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efiret = RT->set_variable(inode->name, &inode->vendor,
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0, 0, NULL);
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if (EFI_ERROR(efiret))
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return -efi_errno(efiret);
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list_del(&inode->node);
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free(inode);
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}
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}
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return 0;
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}
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struct efivars_file {
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void *buf;
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unsigned long size;
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@ -197,6 +266,38 @@ static int efivarfs_read(struct device_d *_dev, FILE *f, void *buf, size_t insiz
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return insize;
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}
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static int efivarfs_write(struct device_d *_dev, FILE *f, const void *buf, size_t insize)
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{
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struct efivars_file *efile = f->inode;
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if (efile->size < f->pos + insize) {
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efile->buf = realloc(efile->buf, f->pos + insize);
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efile->size = f->pos + insize;
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}
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memcpy(efile->buf + f->pos, buf, insize);
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RT->set_variable(efile->name, &efile->vendor, efile->attributes,
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efile->size ? efile->size : 1, efile->buf);
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return insize;
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}
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static int efivarfs_truncate(struct device_d *dev, FILE *f, ulong size)
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{
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struct efivars_file *efile = f->inode;
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efile->size = size;
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efile->buf = realloc(efile->buf, efile->size + sizeof(uint32_t));
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RT->set_variable(efile->name, &efile->vendor, efile->attributes,
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efile->size ? efile->size : 1, efile->buf);
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f->size = efile->size;
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return 0;
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}
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static loff_t efivarfs_lseek(struct device_d *dev, FILE *f, loff_t pos)
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{
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f->pos = pos;
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@ -320,9 +421,13 @@ static void efivarfs_remove(struct device_d *dev)
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}
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static struct fs_driver_d efivarfs_driver = {
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.create = efivars_create,
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.unlink = efivars_unlink,
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.open = efivarfs_open,
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.close = efivarfs_close,
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.read = efivarfs_read,
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.write = efivarfs_write,
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.truncate = efivarfs_truncate,
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.lseek = efivarfs_lseek,
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.opendir = efivarfs_opendir,
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.readdir = efivarfs_readdir,
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@ -279,7 +279,8 @@ typedef struct {
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u32 *Attributes, unsigned long *data_size, void *data);
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efi_status_t (EFIAPI *get_next_variable)(unsigned long *variable_name_size,
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s16 *variable_name, efi_guid_t *vendor);
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void *set_variable;
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efi_status_t (EFIAPI *set_variable)(s16 *variable_name, efi_guid_t *vendor,
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u32 Attributes, unsigned long data_size, void *data);
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void *get_next_high_mono_count;
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void (EFIAPI *reset_system)(efi_reset_type_t reset_type, efi_status_t reset_status,
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unsigned long data_size, void *reset_data);
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