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efivarfs: fix statfs() on efivarfs

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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>
This commit is contained in:
Heinrich Schuchardt 2023-09-10 06:54:45 +02:00 committed by Ard Biesheuvel
parent e7761d827e
commit 79b83606ab
1 changed files with 10 additions and 4 deletions
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14
fs/efivarfs/super.c
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@ -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