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/** @file
EFI_FILE_PROTOCOL.GetInfo() member function for the Virtio Filesystem driver.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <Guid/FileSystemInfo.h> // gEfiFileSystemInfoGuid
#include <Guid/FileSystemVolumeLabelInfo.h> // gEfiFileSystemVolumeLabelInfo...
#include <Library/BaseLib.h> // StrSize()
#include <Library/BaseMemoryLib.h> // CompareGuid()
#include "VirtioFsDxe.h"
/**
Provide EFI_FILE_INFO about this particular file.
**/
STATIC
EFI_STATUS
GetFileInfo (
IN EFI_FILE_PROTOCOL *This,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
VIRTIO_FS_FILE *VirtioFsFile;
VIRTIO_FS *VirtioFs;
UINTN AllocSize;
UINTN BasenameSize;
EFI_STATUS Status;
EFI_FILE_INFO *FileInfo;
VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE FuseAttr;
VirtioFsFile = VIRTIO_FS_FILE_FROM_SIMPLE_FILE (This);
VirtioFs = VirtioFsFile->OwnerFs;
AllocSize = *BufferSize;
//
// Calculate the needed size.
//
BasenameSize = 0;
Status = VirtioFsGetBasename (VirtioFsFile->CanonicalPathname, NULL,
&BasenameSize);
ASSERT (Status == EFI_BUFFER_TOO_SMALL);
*BufferSize = OFFSET_OF (EFI_FILE_INFO, FileName) + BasenameSize;
if (*BufferSize > AllocSize) {
return EFI_BUFFER_TOO_SMALL;
}
//
// Set the structure size, and store the basename.
//
FileInfo = Buffer;
FileInfo->Size = *BufferSize;
Status = VirtioFsGetBasename (VirtioFsFile->CanonicalPathname,
FileInfo->FileName, &BasenameSize);
ASSERT_EFI_ERROR (Status);
//
// Fetch the file attributes, and convert them into the caller's buffer.
//
Status = VirtioFsFuseGetAttr (VirtioFs, VirtioFsFile->NodeId, &FuseAttr);
if (!EFI_ERROR (Status)) {
Status = VirtioFsFuseAttrToEfiFileInfo (&FuseAttr, FileInfo);
}
return (Status == EFI_BUFFER_TOO_SMALL) ? EFI_DEVICE_ERROR : Status;
}
/**
Provide EFI_FILE_SYSTEM_INFO about the filesystem this file lives on.
**/
STATIC
EFI_STATUS
GetFileSystemInfo (
IN EFI_FILE_PROTOCOL *This,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
VIRTIO_FS_FILE *VirtioFsFile;
VIRTIO_FS *VirtioFs;
UINTN AllocSize;
UINTN LabelSize;
EFI_STATUS Status;
VIRTIO_FS_FUSE_STATFS_RESPONSE FilesysAttr;
UINT64 MaxBlocks;
EFI_FILE_SYSTEM_INFO *FilesysInfo;
VirtioFsFile = VIRTIO_FS_FILE_FROM_SIMPLE_FILE (This);
VirtioFs = VirtioFsFile->OwnerFs;
AllocSize = *BufferSize;
//
// Calculate the needed size.
//
LabelSize = StrSize (VirtioFs->Label);
*BufferSize = OFFSET_OF (EFI_FILE_SYSTEM_INFO, VolumeLabel) + LabelSize;
if (*BufferSize > AllocSize) {
return EFI_BUFFER_TOO_SMALL;
}
//
// Fetch the filesystem attributes.
//
Status = VirtioFsFuseStatFs (VirtioFs, VirtioFsFile->NodeId, &FilesysAttr);
if (EFI_ERROR (Status)) {
return (Status == EFI_BUFFER_TOO_SMALL) ? EFI_DEVICE_ERROR : Status;
}
//
// Sanity checks...
//
if (FilesysAttr.Frsize != FilesysAttr.Bsize) {
return EFI_UNSUPPORTED;
}
if (FilesysAttr.Frsize == 0 || FilesysAttr.Blocks == 0 ||
FilesysAttr.Bavail > FilesysAttr.Blocks) {
return EFI_DEVICE_ERROR;
}
MaxBlocks = DivU64x32 (MAX_UINT64, FilesysAttr.Frsize);
if (FilesysAttr.Blocks > MaxBlocks || FilesysAttr.Bavail > MaxBlocks) {
return EFI_DEVICE_ERROR;
}
//
// Fill in EFI_FILE_SYSTEM_INFO.
//
FilesysInfo = Buffer;
FilesysInfo->Size = *BufferSize;
FilesysInfo->ReadOnly = FALSE;
FilesysInfo->VolumeSize = MultU64x32 (FilesysAttr.Blocks,
FilesysAttr.Frsize);
FilesysInfo->FreeSpace = MultU64x32 (FilesysAttr.Bavail,
FilesysAttr.Frsize);
FilesysInfo->BlockSize = FilesysAttr.Frsize;
CopyMem (FilesysInfo->VolumeLabel, VirtioFs->Label, LabelSize);
return EFI_SUCCESS;
}
/**
Return the filesystem label as EFI_FILE_SYSTEM_VOLUME_LABEL.
**/
STATIC
EFI_STATUS
GetFileSystemVolumeLabelInfo (
IN EFI_FILE_PROTOCOL *This,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
VIRTIO_FS_FILE *VirtioFsFile;
VIRTIO_FS *VirtioFs;
UINTN AllocSize;
UINTN LabelSize;
EFI_FILE_SYSTEM_VOLUME_LABEL *FilesysVolumeLabel;
VirtioFsFile = VIRTIO_FS_FILE_FROM_SIMPLE_FILE (This);
VirtioFs = VirtioFsFile->OwnerFs;
AllocSize = *BufferSize;
//
// Calculate the needed size.
//
LabelSize = StrSize (VirtioFs->Label);
*BufferSize = (OFFSET_OF (EFI_FILE_SYSTEM_VOLUME_LABEL, VolumeLabel) +
LabelSize);
if (*BufferSize > AllocSize) {
return EFI_BUFFER_TOO_SMALL;
}
//
// Store the label.
//
FilesysVolumeLabel = Buffer;
CopyMem (FilesysVolumeLabel->VolumeLabel, VirtioFs->Label, LabelSize);
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
VirtioFsSimpleFileGetInfo (
IN EFI_FILE_PROTOCOL *This,
IN EFI_GUID *InformationType,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
)
{
if (CompareGuid (InformationType, &gEfiFileInfoGuid)) {
return GetFileInfo (This, BufferSize, Buffer);
}
if (CompareGuid (InformationType, &gEfiFileSystemInfoGuid)) {
return GetFileSystemInfo (This, BufferSize, Buffer);
}
if (CompareGuid (InformationType, &gEfiFileSystemVolumeLabelInfoIdGuid)) {
return GetFileSystemVolumeLabelInfo (This, BufferSize, Buffer);
}
return EFI_UNSUPPORTED;
}
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