From 79b83606abc778aa3cbee535b362ce905d0b9448 Mon Sep 17 00:00:00 2001 From: Heinrich Schuchardt Date: Sun, 10 Sep 2023 06:54:45 +0200 Subject: efivarfs: fix statfs() on efivarfs 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 EFI_UNSUPPORTED, just report the file system size as 0 as statfs_simple() previously did. Fixes: d86ff3333cb1 ("efivarfs: expose used and total size") Link: https://lore.kernel.org/all/20230910045445.41632-1-heinrich.schuchardt@canonical.com/ Signed-off-by: Heinrich Schuchardt [ardb: log warning on QueryVariableInfo() failure] Reviewed-by: Ilias Apalodimas Signed-off-by: Ard Biesheuvel --- fs/efivarfs/super.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) (limited to 'fs') diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c index e028fafa04f3..996271473609 100644 --- a/fs/efivarfs/super.c +++ b/fs/efivarfs/super.c @@ -32,10 +32,16 @@ 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); + /* Some UEFI firmware does not implement QueryVariableInfo() */ + storage_space = remaining_space = 0; + 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 && status != EFI_UNSUPPORTED) + pr_warn_ratelimited("query_variable_info() failed: 0x%lx\n", + status); + } /* * This is not a normal filesystem, so no point in pretending it has a block -- cgit v1.2.3