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OvmfPkg/VirtioFsDxe: add helper for determining file size update 

Add the VirtioFsGetFuseSizeUpdate() function, for determining whether an
EFI_FILE_PROTOCOL.SetInfo() invocation requests a file size update.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201216211125.19496-46-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
This commit is contained in:
Laszlo Ersek 2020-12-16 22:11:22 +01:00 committed by mergify[bot]
parent 647340b0ce
commit 6c33d7b2b1
2 changed files with 48 additions and 0 deletions
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40
OvmfPkg/VirtioFsDxe/Helpers.c
View File

@ -2173,3 +2173,43 @@ VirtioFsFuseDirentPlusToEfiFileInfo (
return EFI_SUCCESS;
}
/**
Given an EFI_FILE_INFO object received in an EFI_FILE_PROTOCOL.SetInfo()
call, determine whether updating the size of the file is necessary, relative
to an EFI_FILE_INFO object describing the current state of the file.
@param[in] Info The EFI_FILE_INFO describing the current state of the
file. The caller is responsible for populating Info on
input with VirtioFsFuseAttrToEfiFileInfo(), from the
current FUSE attributes of the file. The Info->Size and
Info->FileName members are ignored.
@param[in] NewInfo The EFI_FILE_INFO object received in the
EFI_FILE_PROTOCOL.SetInfo() call.
@param[out] Update Set to TRUE on output if the file size needs to be
updated. Set to FALSE otherwise.
@param[out] Size If Update is set to TRUE, then Size provides the new file
size to set. Otherwise, Size is not written to.
**/
VOID
VirtioFsGetFuseSizeUpdate (
IN EFI_FILE_INFO *Info,
IN EFI_FILE_INFO *NewInfo,
OUT BOOLEAN *Update,
OUT UINT64 *Size
)
{
BOOLEAN IsDirectory;
IsDirectory = (BOOLEAN)((Info->Attribute & EFI_FILE_DIRECTORY) != 0);
if (IsDirectory || Info->FileSize == NewInfo->FileSize) {
*Update = FALSE;
return;
}
*Update = TRUE;
*Size = NewInfo->FileSize;
}

8
OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
View File

@ -282,6 +282,14 @@ VirtioFsFuseDirentPlusToEfiFileInfo (
IN OUT EFI_FILE_INFO *FileInfo
);
VOID
VirtioFsGetFuseSizeUpdate (
IN EFI_FILE_INFO *Info,
IN EFI_FILE_INFO *NewInfo,
OUT BOOLEAN *Update,
OUT UINT64 *Size
);
//
// Wrapper functions for FUSE commands (primitives).
//