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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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