diff options
| author | Heinrich Schuchardt <heinrich.schuchardt@canonical.com> | 2023-09-10 07:54:45 +0300 |
|---|---|---|
| committer | Ard Biesheuvel <ardb@kernel.org> | 2023-09-11 12:10:02 +0300 |
| commit | 79b83606abc778aa3cbee535b362ce905d0b9448 (patch) | |
| tree | 870e98c342a29df53d8a0e99e9e5f9e281edfdfc /fs/efivarfs/super.c | |
| parent | e7761d827e99919c32400056a884e481ef008ec4 (diff) | |
| download | linux-79b83606abc778aa3cbee535b362ce905d0b9448.tar.xz | |
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 <heinrich.schuchardt@canonical.com>
[ardb: log warning on QueryVariableInfo() failure]
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
Diffstat (limited to 'fs/efivarfs/super.c')
| -rw-r--r-- | fs/efivarfs/super.c | 14 |
1 files changed, 10 insertions, 4 deletions
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 |