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OvmfPkg/VirtioFsDxe: implement EFI_FILE_PROTOCOL.GetPosition, .SetPosition

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Using the functions introduced previously, we can now implement
VirtioFsSimpleFileGetPosition() and VirtioFsSimpleFileSetPosition().

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: <20201216211125.19496-32-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
This commit is contained in:
Laszlo Ersek
2020-12-16 22:11:08 +01:00
committed by mergify[bot]
parent b6b240f94f
commit c4edb49b4f
5 changed files with 50 additions and 2 deletions
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40
OvmfPkg/VirtioFsDxe/SimpleFsSetPosition.c
View File

@ -16,5 +16,43 @@ VirtioFsSimpleFileSetPosition (
IN UINT64 Position
)
{
return EFI_DEVICE_ERROR;
VIRTIO_FS_FILE *VirtioFsFile;
VIRTIO_FS *VirtioFs;
EFI_STATUS Status;
VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE FuseAttr;
VirtioFsFile = VIRTIO_FS_FILE_FROM_SIMPLE_FILE (This);
//
// Directories can only be rewound, per spec.
//
if (VirtioFsFile->IsDirectory) {
if (Position != 0) {
return EFI_UNSUPPORTED;
}
VirtioFsFile->FilePosition = 0;
return EFI_SUCCESS;
}
//
// Regular file.
//
if (Position < MAX_UINT64) {
//
// Caller is requesting absolute file position.
//
VirtioFsFile->FilePosition = Position;
return EFI_SUCCESS;
}
//
// Caller is requesting a seek to EOF.
//
VirtioFs = VirtioFsFile->OwnerFs;
Status = VirtioFsFuseGetAttr (VirtioFs, VirtioFsFile->NodeId, &FuseAttr);
if (EFI_ERROR (Status)) {
return Status;
}
VirtioFsFile->FilePosition = FuseAttr.Size;
return EFI_SUCCESS;
}