Implement the standard FS ops for writing/manipulating
efivars.
Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
---
fs/efivarfs.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
include/efi.h | 3 +-
2 files changed, 107 insertions(+), 1 deletion(-)
diff --git a/fs/efivarfs.c b/fs/efivarfs.c
index f54925133848..9a1503bd1387 100644
--- a/fs/efivarfs.c
+++ b/fs/efivarfs.c
@@ -126,6 +126,75 @@ static int efivarfs_parse_filename(const char *filename, efi_guid_t *vendor, s16
return 0;
}
+static int efivars_create(struct device_d *dev, const char *pathname, mode_t mode)
+{
+ struct efivarfs_priv *priv = dev->priv;
+ struct efivarfs_inode *inode;
+ efi_guid_t vendor;
+ efi_status_t efiret;
+ u8 dummydata;
+ char *name8;
+ s16 *name;
+ int ret;
+
+ if (pathname[0] == '/')
+ pathname++;
+
+ /* deny creating files with other vendor GUID than our own */
+ ret = efivarfs_parse_filename(pathname, &vendor, &name);
+ if (ret)
+ return -ENOENT;
+
+ if (memcmp(&vendor, &EFI_BAREBOX_VENDOR_GUID, sizeof(efi_guid_t)))
+ return -EPERM;
+
+ inode = xzalloc(sizeof(*inode));
+ inode->name = name;
+ inode->vendor = vendor;
+
+
+ name8 = strdup_wchar_to_char(inode->name);
+ inode->full_name = asprintf("%s-%pUl", name8, &inode->vendor);
+ free(name8);
+
+ efiret = RT->set_variable(inode->name, &inode->vendor,
+ EFI_VARIABLE_NON_VOLATILE |
+ EFI_VARIABLE_BOOTSERVICE_ACCESS |
+ EFI_VARIABLE_RUNTIME_ACCESS,
+ 1, &dummydata);
+ if (EFI_ERROR(efiret)) {
+ free(inode);
+ return -efi_errno(efiret);
+ }
+
+ list_add_tail(&inode->node, &priv->inodes);
+
+ return 0;
+}
+
+static int efivars_unlink(struct device_d *dev, const char *pathname)
+{
+ struct efivarfs_priv *priv = dev->priv;
+ struct efivarfs_inode *inode, *tmp;
+ efi_status_t efiret;
+
+ if (pathname[0] == '/')
+ pathname++;
+
+ list_for_each_entry_safe(inode, tmp, &priv->inodes, node) {
+ if (!strcmp(inode->full_name, pathname)) {
+ efiret = RT->set_variable(inode->name, &inode->vendor,
+ 0, 0, NULL);
+ if (EFI_ERROR(efiret))
+ return -efi_errno(efiret);
+ list_del(&inode->node);
+ free(inode);
+ }
+ }
+
+ return 0;
+}
+
struct efivars_file {
void *buf;
unsigned long size;
@@ -197,6 +266,38 @@ static int efivarfs_read(struct device_d *_dev, FILE *f, void *buf, size_t insiz
return insize;
}
+static int efivarfs_write(struct device_d *_dev, FILE *f, const void *buf, size_t insize)
+{
+ struct efivars_file *efile = f->inode;
+
+ if (efile->size < f->pos + insize) {
+ efile->buf = realloc(efile->buf, f->pos + insize);
+ efile->size = f->pos + insize;
+ }
+
+ memcpy(efile->buf + f->pos, buf, insize);
+
+ RT->set_variable(efile->name, &efile->vendor, efile->attributes,
+ efile->size ? efile->size : 1, efile->buf);
+
+ return insize;
+}
+
+static int efivarfs_truncate(struct device_d *dev, FILE *f, ulong size)
+{
+ struct efivars_file *efile = f->inode;
+
+ efile->size = size;
+ efile->buf = realloc(efile->buf, efile->size + sizeof(uint32_t));
+
+ RT->set_variable(efile->name, &efile->vendor, efile->attributes,
+ efile->size ? efile->size : 1, efile->buf);
+
+ f->size = efile->size;
+
+ return 0;
+}
+
static loff_t efivarfs_lseek(struct device_d *dev, FILE *f, loff_t pos)
{
f->pos = pos;
@@ -320,9 +421,13 @@ static void efivarfs_remove(struct device_d *dev)
}
static struct fs_driver_d efivarfs_driver = {
+ .create = efivars_create,
+ .unlink = efivars_unlink,
.open = efivarfs_open,
.close = efivarfs_close,
.read = efivarfs_read,
+ .write = efivarfs_write,
+ .truncate = efivarfs_truncate,
.lseek = efivarfs_lseek,
.opendir = efivarfs_opendir,
.readdir = efivarfs_readdir,
diff --git a/include/efi.h b/include/efi.h
index 507115881b55..cc6a0d81a543 100644
--- a/include/efi.h
+++ b/include/efi.h
@@ -279,7 +279,8 @@ typedef struct {
u32 *Attributes, unsigned long *data_size, void *data);
efi_status_t (EFIAPI *get_next_variable)(unsigned long *variable_name_size,
s16 *variable_name, efi_guid_t *vendor);
- void *set_variable;
+ efi_status_t (EFIAPI *set_variable)(s16 *variable_name, efi_guid_t *vendor,
+ u32 Attributes, unsigned long data_size, void *data);
void *get_next_high_mono_count;
void (EFIAPI *reset_system)(efi_reset_type_t reset_type, efi_status_t reset_status,
unsigned long data_size, void *reset_data);
--
2.1.1
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