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audk/OvmfPkg/VirtioFsDxe/VirtioFsDxe.h

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/** @file
Internal macro definitions, type definitions, and function declarations for
the Virtio Filesystem device driver.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#ifndef VIRTIO_FS_DXE_H_
#define VIRTIO_FS_DXE_H_
#include <Base.h> // SIGNATURE_64()
#include <Guid/FileInfo.h> // EFI_FILE_INFO
#include <IndustryStandard/VirtioFs.h> // VIRTIO_FS_TAG_BYTES
#include <Library/DebugLib.h> // CR()
#include <Protocol/SimpleFileSystem.h> // EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
#include <Protocol/VirtioDevice.h> // VIRTIO_DEVICE_PROTOCOL
#include <Uefi/UefiBaseType.h> // EFI_EVENT
#define VIRTIO_FS_SIG SIGNATURE_64 ('V', 'I', 'R', 'T', 'I', 'O', 'F', 'S')
#define VIRTIO_FS_FILE_SIG \
SIGNATURE_64 ('V', 'I', 'O', 'F', 'S', 'F', 'I', 'L')
//
// The following limit applies to two kinds of pathnames.
//
// - The length of a POSIX-style, canonical pathname *at rest* never exceeds
// VIRTIO_FS_MAX_PATHNAME_LENGTH. (Length is defined as the number of CHAR8
// elements in the canonical pathname, excluding the terminating '\0'.) This
// is an invariant that is ensured for canonical pathnames created, and that
// is assumed about canonical pathname inputs (which all originate
// internally).
//
// - If the length of a UEFI-style pathname *argument*, originating directly or
// indirectly from the EFI_FILE_PROTOCOL caller, exceeds
// VIRTIO_FS_MAX_PATHNAME_LENGTH, then the argument is rejected. (Length is
// defined as the number of CHAR16 elements in the UEFI-style pathname,
// excluding the terminating L'\0'.) This is a restriction that's checked on
// external UEFI-style pathname inputs.
//
// The limit is not expected to be a practical limitation; it's only supposed
// to prevent attempts at overflowing size calculations. For both kinds of
// pathnames, separate limits could be used; a common limit is used purely for
// simplicity.
//
#define VIRTIO_FS_MAX_PATHNAME_LENGTH ((UINTN)65535)
//
// Maximum value for VIRTIO_FS_FILE.NumFileInfo.
//
#define VIRTIO_FS_FILE_MAX_FILE_INFO 256
//
// Filesystem label encoded in UCS-2, transformed from the UTF-8 representation
// in "VIRTIO_FS_CONFIG.Tag", and NUL-terminated. Only the printable ASCII code
// points (U+0020 through U+007E) are supported.
//
typedef CHAR16 VIRTIO_FS_LABEL[VIRTIO_FS_TAG_BYTES + 1];
//
// Main context structure, expressing an EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
// interface on top of the Virtio Filesystem device.
//
typedef struct {
//
// Parts of this structure are initialized / torn down in various functions
// at various call depths. The table to the right should make it easier to
// track them.
//
// field init function init depth
// ----------- ------------------ ----------
UINT64 Signature; // DriverBindingStart 0
VIRTIO_DEVICE_PROTOCOL *Virtio; // DriverBindingStart 0
VIRTIO_FS_LABEL Label; // VirtioFsInit 1
UINT16 QueueSize; // VirtioFsInit 1
VRING Ring; // VirtioRingInit 2
VOID *RingMap; // VirtioRingMap 2
UINT64 RequestId; // FuseInitSession 1
UINT32 MaxWrite; // FuseInitSession 1
EFI_EVENT ExitBoot; // DriverBindingStart 0
LIST_ENTRY OpenFiles; // DriverBindingStart 0
EFI_SIMPLE_FILE_SYSTEM_PROTOCOL SimpleFs; // DriverBindingStart 0
} VIRTIO_FS;
#define VIRTIO_FS_FROM_SIMPLE_FS(SimpleFsReference) \
CR (SimpleFsReference, VIRTIO_FS, SimpleFs, VIRTIO_FS_SIG);
//
// Structure for describing a contiguous buffer, potentially mapped for Virtio
// transfer.
//
typedef struct {
//
// The following fields originate from the owner of the buffer.
//
VOID *Buffer;
UINTN Size;
//
// All of the fields below, until the end of the structure, are
// zero-initialized when the structure is initially validated.
//
// Mapped, MappedAddress and Mapping are updated when the buffer is mapped
// for VirtioOperationBusMasterRead or VirtioOperationBusMasterWrite. They
// are again updated when the buffer is unmapped.
//
BOOLEAN Mapped;
EFI_PHYSICAL_ADDRESS MappedAddress;
VOID *Mapping;
//
// Transferred is updated after VirtioFlush() returns successfully:
// - for VirtioOperationBusMasterRead, Transferred is set to Size;
// - for VirtioOperationBusMasterWrite, Transferred is calculated from the
// UsedLen output parameter of VirtioFlush().
//
UINTN Transferred;
} VIRTIO_FS_IO_VECTOR;
//
// Structure for describing a list of IO Vectors.
//
typedef struct {
//
// The following fields originate from the owner of the buffers.
//
VIRTIO_FS_IO_VECTOR *IoVec;
UINTN NumVec;
//
// TotalSize is calculated when the scatter-gather list is initially
// validated.
//
UINT32 TotalSize;
} VIRTIO_FS_SCATTER_GATHER_LIST;
//
// Private context structure that exposes EFI_FILE_PROTOCOL on top of an open
// FUSE file reference.
//
typedef struct {
UINT64 Signature;
EFI_FILE_PROTOCOL SimpleFile;
BOOLEAN IsDirectory;
BOOLEAN IsOpenForWriting;
VIRTIO_FS *OwnerFs;
LIST_ENTRY OpenFilesEntry;
CHAR8 *CanonicalPathname;
UINT64 FilePosition;
//
// In the FUSE wire protocol, every request except FUSE_INIT refers to a
// file, namely by the "VIRTIO_FS_FUSE_REQUEST.NodeId" field; that is, by the
// inode number of the file. However, some of the FUSE requests that we need
// for some of the EFI_FILE_PROTOCOL member functions require an open file
// handle *in addition* to the inode number. For simplicity, whenever a
// VIRTIO_FS_FILE object is created, primarily defined by its NodeId field,
// we also *open* the referenced file at once, and save the returned file
// handle in the FuseHandle field. This way, when an EFI_FILE_PROTOCOL member
// function must send a FUSE request that needs the file handle *in addition*
// to the inode number, FuseHandle will be at our disposal at once.
//
UINT64 NodeId;
UINT64 FuseHandle;
//
// EFI_FILE_INFO objects cached for an in-flight directory read.
//
// For reading through a directory stream with tolerable performance, we have
// to call FUSE_READDIRPLUS each time with such a buffer that can deliver a
// good number of variable size records (VIRTIO_FS_FUSE_DIRENTPLUS_RESPONSE
// elements). Every time we do that, we turn the whole bunch into an array of
// EFI_FILE_INFOs immediately. EFI_FILE_PROTOCOL.Read() invocations (on
// directories) will be served from this EFI_FILE_INFO cache.
//
UINT8 *FileInfoArray;
UINTN SingleFileInfoSize;
UINTN NumFileInfo;
UINTN NextFileInfo;
} VIRTIO_FS_FILE;
#define VIRTIO_FS_FILE_FROM_SIMPLE_FILE(SimpleFileReference) \
CR (SimpleFileReference, VIRTIO_FS_FILE, SimpleFile, VIRTIO_FS_FILE_SIG);
#define VIRTIO_FS_FILE_FROM_OPEN_FILES_ENTRY(OpenFilesEntryReference) \
CR (OpenFilesEntryReference, VIRTIO_FS_FILE, OpenFilesEntry, \
VIRTIO_FS_FILE_SIG);
//
// Initialization and helper routines for the Virtio Filesystem device.
//
EFI_STATUS
VirtioFsInit (
IN OUT VIRTIO_FS *VirtioFs
);
VOID
VirtioFsUninit (
IN OUT VIRTIO_FS *VirtioFs
);
VOID
EFIAPI
VirtioFsExitBoot (
IN EFI_EVENT ExitBootEvent,
IN VOID *VirtioFsAsVoid
);
EFI_STATUS
VirtioFsSgListsValidate (
IN VIRTIO_FS *VirtioFs,
IN OUT VIRTIO_FS_SCATTER_GATHER_LIST *RequestSgList,
IN OUT VIRTIO_FS_SCATTER_GATHER_LIST *ResponseSgList OPTIONAL
);
EFI_STATUS
VirtioFsSgListsSubmit (
IN OUT VIRTIO_FS *VirtioFs,
IN OUT VIRTIO_FS_SCATTER_GATHER_LIST *RequestSgList,
IN OUT VIRTIO_FS_SCATTER_GATHER_LIST *ResponseSgList OPTIONAL
);
EFI_STATUS
VirtioFsFuseNewRequest (
IN OUT VIRTIO_FS *VirtioFs,
OUT VIRTIO_FS_FUSE_REQUEST *Request,
IN UINT32 RequestSize,
IN VIRTIO_FS_FUSE_OPCODE Opcode,
IN UINT64 NodeId
);
EFI_STATUS
VirtioFsFuseCheckResponse (
IN VIRTIO_FS_SCATTER_GATHER_LIST *ResponseSgList,
IN UINT64 RequestId,
OUT UINTN *TailBufferFill
);
EFI_STATUS
VirtioFsErrnoToEfiStatus (
IN INT32 Errno
);
EFI_STATUS
VirtioFsAppendPath (
IN CHAR8 *LhsPath8,
IN CHAR16 *RhsPath16,
OUT CHAR8 **ResultPath8,
OUT BOOLEAN *RootEscape
);
EFI_STATUS
VirtioFsLookupMostSpecificParentDir (
IN OUT VIRTIO_FS *VirtioFs,
IN OUT CHAR8 *Path,
OUT UINT64 *DirNodeId,
OUT CHAR8 **LastComponent
);
EFI_STATUS
VirtioFsGetBasename (
IN CHAR8 *Path,
OUT CHAR16 *Basename OPTIONAL,
IN OUT UINTN *BasenameSize
);
EFI_STATUS
VirtioFsComposeRenameDestination (
IN CHAR8 *LhsPath8,
IN CHAR16 *RhsPath16,
OUT CHAR8 **ResultPath8,
OUT BOOLEAN *RootEscape
);
EFI_STATUS
VirtioFsFuseAttrToEfiFileInfo (
IN VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr,
OUT EFI_FILE_INFO *FileInfo
);
EFI_STATUS
VirtioFsFuseDirentPlusToEfiFileInfo (
IN VIRTIO_FS_FUSE_DIRENTPLUS_RESPONSE *FuseDirent,
IN OUT EFI_FILE_INFO *FileInfo
);
VOID
VirtioFsGetFuseSizeUpdate (
IN EFI_FILE_INFO *Info,
IN EFI_FILE_INFO *NewInfo,
OUT BOOLEAN *Update,
OUT UINT64 *Size
);
EFI_STATUS
VirtioFsGetFuseTimeUpdates (
IN EFI_FILE_INFO *Info,
IN EFI_FILE_INFO *NewInfo,
OUT BOOLEAN *UpdateAtime,
OUT BOOLEAN *UpdateMtime,
OUT UINT64 *Atime,
OUT UINT64 *Mtime
);
EFI_STATUS
VirtioFsGetFuseModeUpdate (
IN EFI_FILE_INFO *Info,
IN EFI_FILE_INFO *NewInfo,
OUT BOOLEAN *Update,
OUT UINT32 *Mode
);
//
// Wrapper functions for FUSE commands (primitives).
//
EFI_STATUS
VirtioFsFuseLookup (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 DirNodeId,
IN CHAR8 *Name,
OUT UINT64 *NodeId,
OUT VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr
);
EFI_STATUS
VirtioFsFuseForget (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId
);
EFI_STATUS
VirtioFsFuseGetAttr (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
OUT VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr
);
EFI_STATUS
VirtioFsFuseSetAttr (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN UINT64 *Size OPTIONAL,
IN UINT64 *Atime OPTIONAL,
IN UINT64 *Mtime OPTIONAL,
IN UINT32 *Mode OPTIONAL
);
EFI_STATUS
VirtioFsFuseMkDir (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 ParentNodeId,
IN CHAR8 *Name,
OUT UINT64 *NodeId
);
EFI_STATUS
VirtioFsFuseRemoveFileOrDir (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 ParentNodeId,
IN CHAR8 *Name,
IN BOOLEAN IsDir
);
EFI_STATUS
VirtioFsFuseOpen (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN BOOLEAN ReadWrite,
OUT UINT64 *FuseHandle
);
EFI_STATUS
VirtioFsFuseReadFileOrDir (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN UINT64 FuseHandle,
IN BOOLEAN IsDir,
IN UINT64 Offset,
IN OUT UINT32 *Size,
OUT VOID *Data
);
EFI_STATUS
VirtioFsFuseWrite (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN UINT64 FuseHandle,
IN UINT64 Offset,
IN OUT UINT32 *Size,
IN VOID *Data
);
EFI_STATUS
VirtioFsFuseStatFs (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
OUT VIRTIO_FS_FUSE_STATFS_RESPONSE *FilesysAttr
);
EFI_STATUS
VirtioFsFuseReleaseFileOrDir (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN UINT64 FuseHandle,
IN BOOLEAN IsDir
);
EFI_STATUS
VirtioFsFuseFsyncFileOrDir (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN UINT64 FuseHandle,
IN BOOLEAN IsDir
);
EFI_STATUS
VirtioFsFuseFlush (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN UINT64 FuseHandle
);
EFI_STATUS
VirtioFsFuseInitSession (
IN OUT VIRTIO_FS *VirtioFs
);
EFI_STATUS
VirtioFsFuseOpenDir (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
OUT UINT64 *FuseHandle
);
EFI_STATUS
VirtioFsFuseOpenOrCreate (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 ParentNodeId,
IN CHAR8 *Name,
OUT UINT64 *NodeId,
OUT UINT64 *FuseHandle
);
EFI_STATUS
VirtioFsFuseRename (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 OldParentNodeId,
IN CHAR8 *OldName,
IN UINT64 NewParentNodeId,
IN CHAR8 *NewName
);
//
// EFI_SIMPLE_FILE_SYSTEM_PROTOCOL member functions for the Virtio Filesystem
// driver.
//
EFI_STATUS
EFIAPI
VirtioFsOpenVolume (
IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL *This,
OUT EFI_FILE_PROTOCOL **Root
);
//
// EFI_FILE_PROTOCOL member functions for the Virtio Filesystem driver.
//
EFI_STATUS
EFIAPI
VirtioFsSimpleFileClose (
IN EFI_FILE_PROTOCOL *This
);
EFI_STATUS
EFIAPI
VirtioFsSimpleFileDelete (
IN EFI_FILE_PROTOCOL *This
);
EFI_STATUS
EFIAPI
VirtioFsSimpleFileFlush (
IN EFI_FILE_PROTOCOL *This
);
EFI_STATUS
EFIAPI
VirtioFsSimpleFileGetInfo (
IN EFI_FILE_PROTOCOL *This,
IN EFI_GUID *InformationType,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
);
EFI_STATUS
EFIAPI
VirtioFsSimpleFileGetPosition (
IN EFI_FILE_PROTOCOL *This,
OUT UINT64 *Position
);
EFI_STATUS
EFIAPI
VirtioFsSimpleFileOpen (
IN EFI_FILE_PROTOCOL *This,
OUT EFI_FILE_PROTOCOL **NewHandle,
IN CHAR16 *FileName,
IN UINT64 OpenMode,
IN UINT64 Attributes
);
EFI_STATUS
EFIAPI
VirtioFsSimpleFileRead (
IN EFI_FILE_PROTOCOL *This,
IN OUT UINTN *BufferSize,
OUT VOID *Buffer
);
EFI_STATUS
EFIAPI
VirtioFsSimpleFileSetInfo (
IN EFI_FILE_PROTOCOL *This,
IN EFI_GUID *InformationType,
IN UINTN BufferSize,
IN VOID *Buffer
);
EFI_STATUS
EFIAPI
VirtioFsSimpleFileSetPosition (
IN EFI_FILE_PROTOCOL *This,
IN UINT64 Position
);
EFI_STATUS
EFIAPI
VirtioFsSimpleFileWrite (
IN EFI_FILE_PROTOCOL *This,
IN OUT UINTN *BufferSize,
IN VOID *Buffer
);
#endif // VIRTIO_FS_DXE_H_
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