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/** @file
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL.OpenVolume() member function for the Virtio
Filesystem driver.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Library/BaseLib.h> // InsertTailList()
#include <Library/MemoryAllocationLib.h> // AllocatePool()
#include "VirtioFsDxe.h"
/**
Open the root directory on the Virtio Filesystem.
Refer to EFI_SIMPLE_FILE_SYSTEM_PROTOCOL_OPEN_VOLUME for the interface
contract.
**/
EFI_STATUS
EFIAPI
VirtioFsOpenVolume (
IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *This,
OUT EFI_FILE_PROTOCOL **Root
)
{
VIRTIO_FS *VirtioFs;
VIRTIO_FS_FILE *VirtioFsFile;
EFI_STATUS Status;
CHAR8 *CanonicalPathname;
UINT64 RootDirHandle;
VirtioFs = VIRTIO_FS_FROM_SIMPLE_FS (This);
VirtioFsFile = AllocatePool (sizeof *VirtioFsFile);
if (VirtioFsFile == NULL) {
return EFI_OUT_OF_RESOURCES;
}
CanonicalPathname = AllocateCopyPool (sizeof "/", "/");
if (CanonicalPathname == NULL) {
Status = EFI_OUT_OF_RESOURCES;
goto FreeVirtioFsFile;
}
//
// Open the root directory.
//
Status = VirtioFsFuseOpenDir (
VirtioFs,
VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID,
&RootDirHandle
);
if (EFI_ERROR (Status)) {
goto FreeCanonicalPathname;
}
//
// Populate the new VIRTIO_FS_FILE object.
//
VirtioFsFile->Signature = VIRTIO_FS_FILE_SIG;
VirtioFsFile->SimpleFile.Revision = EFI_FILE_PROTOCOL_REVISION;
VirtioFsFile->SimpleFile.Open = VirtioFsSimpleFileOpen;
VirtioFsFile->SimpleFile.Close = VirtioFsSimpleFileClose;
VirtioFsFile->SimpleFile.Delete = VirtioFsSimpleFileDelete;
VirtioFsFile->SimpleFile.Read = VirtioFsSimpleFileRead;
VirtioFsFile->SimpleFile.Write = VirtioFsSimpleFileWrite;
VirtioFsFile->SimpleFile.GetPosition = VirtioFsSimpleFileGetPosition;
VirtioFsFile->SimpleFile.SetPosition = VirtioFsSimpleFileSetPosition;
VirtioFsFile->SimpleFile.GetInfo = VirtioFsSimpleFileGetInfo;
VirtioFsFile->SimpleFile.SetInfo = VirtioFsSimpleFileSetInfo;
VirtioFsFile->SimpleFile.Flush = VirtioFsSimpleFileFlush;
VirtioFsFile->IsDirectory = TRUE;
VirtioFsFile->IsOpenForWriting = FALSE;
VirtioFsFile->OwnerFs = VirtioFs;
VirtioFsFile->CanonicalPathname = CanonicalPathname;
VirtioFsFile->FilePosition = 0;
VirtioFsFile->NodeId = VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID;
VirtioFsFile->FuseHandle = RootDirHandle;
VirtioFsFile->FileInfoArray = NULL;
VirtioFsFile->SingleFileInfoSize = 0;
VirtioFsFile->NumFileInfo = 0;
VirtioFsFile->NextFileInfo = 0;
//
// One more file open for the filesystem.
//
InsertTailList (&VirtioFs->OpenFiles, &VirtioFsFile->OpenFilesEntry);
*Root = &VirtioFsFile->SimpleFile;
return EFI_SUCCESS;
FreeCanonicalPathname:
FreePool (CanonicalPathname);
FreeVirtioFsFile:
FreePool (VirtioFsFile);
return Status;
}
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