mirror of https://github.com/acidanthera/audk.git
85 lines
2.1 KiB
C
85 lines
2.1 KiB
C
/** @file
|
|
EFI_FILE_PROTOCOL.Write() member function for the Virtio Filesystem driver.
|
|
|
|
Copyright (C) 2020, Red Hat, Inc.
|
|
|
|
SPDX-License-Identifier: BSD-2-Clause-Patent
|
|
**/
|
|
|
|
#include "VirtioFsDxe.h"
|
|
|
|
EFI_STATUS
|
|
EFIAPI
|
|
VirtioFsSimpleFileWrite (
|
|
IN EFI_FILE_PROTOCOL *This,
|
|
IN OUT UINTN *BufferSize,
|
|
IN VOID *Buffer
|
|
)
|
|
{
|
|
VIRTIO_FS_FILE *VirtioFsFile;
|
|
VIRTIO_FS *VirtioFs;
|
|
EFI_STATUS Status;
|
|
UINTN Transferred;
|
|
UINTN Left;
|
|
|
|
VirtioFsFile = VIRTIO_FS_FILE_FROM_SIMPLE_FILE (This);
|
|
VirtioFs = VirtioFsFile->OwnerFs;
|
|
|
|
if (VirtioFsFile->IsDirectory) {
|
|
return EFI_UNSUPPORTED;
|
|
}
|
|
|
|
if (!VirtioFsFile->IsOpenForWriting) {
|
|
return EFI_ACCESS_DENIED;
|
|
}
|
|
|
|
Status = EFI_SUCCESS;
|
|
Transferred = 0;
|
|
Left = *BufferSize;
|
|
while (Left > 0) {
|
|
UINT32 WriteSize;
|
|
|
|
//
|
|
// Honor the write buffer size limit.
|
|
//
|
|
WriteSize = (UINT32)MIN ((UINTN)VirtioFs->MaxWrite, Left);
|
|
Status = VirtioFsFuseWrite (
|
|
VirtioFs,
|
|
VirtioFsFile->NodeId,
|
|
VirtioFsFile->FuseHandle,
|
|
VirtioFsFile->FilePosition + Transferred,
|
|
&WriteSize,
|
|
(UINT8 *)Buffer + Transferred
|
|
);
|
|
if (!EFI_ERROR (Status) && (WriteSize == 0)) {
|
|
//
|
|
// Progress should have been made.
|
|
//
|
|
Status = EFI_DEVICE_ERROR;
|
|
}
|
|
|
|
if (EFI_ERROR (Status)) {
|
|
break;
|
|
}
|
|
|
|
Transferred += WriteSize;
|
|
Left -= WriteSize;
|
|
}
|
|
|
|
*BufferSize = Transferred;
|
|
VirtioFsFile->FilePosition += Transferred;
|
|
//
|
|
// According to the UEFI spec,
|
|
//
|
|
// - 'Partial writes only occur when there has been a data error during the
|
|
// write attempt (such as "file space full")', and
|
|
//
|
|
// - (as an example) EFI_VOLUME_FULL is returned when 'The volume is full'.
|
|
//
|
|
// These together imply that after a partial write, we have to return an
|
|
// error. In other words, (Transferred > 0) is inconsequential for the return
|
|
// value.
|
|
//
|
|
return Status;
|
|
}
|