Some firmware (notably U-Boot) provides GetVariable() and
GetNextVariableName() but not QueryVariableInfo().
With commit d86ff3333cb1 ("efivarfs: expose used and total size") the
statfs syscall was broken for such firmware.
If QueryVariableInfo() does not exist or returns an error, just report the
file-system size as 0 as statfs_simple() previously did.
Fixes: d86ff3333cb1 ("efivarfs: expose used and total size")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@xxxxxxxxxxxxx>
---
Tested on riscv64 StarFive VisionFive 2 with
Linux 6.5 and U-Boot v2023.10-rc4.
---
fs/efivarfs/super.c | 18 +++++++++++-------
1 file changed, 11 insertions(+), 7 deletions(-)
diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c
index e028fafa04f3..7f3064b948ab 100644
--- a/fs/efivarfs/super.c
+++ b/fs/efivarfs/super.c
@@ -32,11 +32,6 @@ static int efivarfs_statfs(struct dentry *dentry, struct kstatfs *buf)
u64 storage_space, remaining_space, max_variable_size;
efi_status_t status;
- status = efivar_query_variable_info(attr, &storage_space, &remaining_space,
- &max_variable_size);
- if (status != EFI_SUCCESS)
- return efi_status_to_err(status);
-
/*
* This is not a normal filesystem, so no point in pretending it has a block
* size; we declare f_bsize to 1, so that we can then report the exact value
@@ -44,10 +39,19 @@ static int efivarfs_statfs(struct dentry *dentry, struct kstatfs *buf)
*/
buf->f_bsize = 1;
buf->f_namelen = NAME_MAX;
- buf->f_blocks = storage_space;
- buf->f_bfree = remaining_space;
buf->f_type = dentry->d_sb->s_magic;
+ /* Some UEFI firmware does not implement QueryVariable() */
+ if (efi_rt_services_supported(EFI_RT_SUPPORTED_QUERY_VARIABLE_INFO)) {
+ status = efivar_query_variable_info(attr, &storage_space,
+ &remaining_space,
+ &max_variable_size);
+ if (status == EFI_SUCCESS) {
+ buf->f_blocks = storage_space;
+ buf->f_bfree = remaining_space;
+ }
+ }
+
/*
* In f_bavail we declare the free space that the kernel will allow writing
* when the storage_paranoia x86 quirk is active. To use more, users
--
2.40.1
