2 Internal macro definitions, type definitions, and function declarations for
3 the Virtio Filesystem device driver.
5 Copyright (C) 2020, Red Hat, Inc.
7 SPDX-License-Identifier: BSD-2-Clause-Patent
10 #ifndef VIRTIO_FS_DXE_H_
11 #define VIRTIO_FS_DXE_H_
13 #include <Base.h> // SIGNATURE_64()
14 #include <Guid/FileInfo.h> // EFI_FILE_INFO
15 #include <IndustryStandard/VirtioFs.h> // VIRTIO_FS_TAG_BYTES
16 #include <Library/DebugLib.h> // CR()
17 #include <Protocol/SimpleFileSystem.h> // EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
18 #include <Protocol/VirtioDevice.h> // VIRTIO_DEVICE_PROTOCOL
19 #include <Uefi/UefiBaseType.h> // EFI_EVENT
21 #define VIRTIO_FS_SIG SIGNATURE_64 ('V', 'I', 'R', 'T', 'I', 'O', 'F', 'S')
23 #define VIRTIO_FS_FILE_SIG \
24 SIGNATURE_64 ('V', 'I', 'O', 'F', 'S', 'F', 'I', 'L')
27 // The following limit applies to two kinds of pathnames.
29 // - The length of a POSIX-style, canonical pathname *at rest* never exceeds
30 // VIRTIO_FS_MAX_PATHNAME_LENGTH. (Length is defined as the number of CHAR8
31 // elements in the canonical pathname, excluding the terminating '\0'.) This
32 // is an invariant that is ensured for canonical pathnames created, and that
33 // is assumed about canonical pathname inputs (which all originate
36 // - If the length of a UEFI-style pathname *argument*, originating directly or
37 // indirectly from the EFI_FILE_PROTOCOL caller, exceeds
38 // VIRTIO_FS_MAX_PATHNAME_LENGTH, then the argument is rejected. (Length is
39 // defined as the number of CHAR16 elements in the UEFI-style pathname,
40 // excluding the terminating L'\0'.) This is a restriction that's checked on
41 // external UEFI-style pathname inputs.
43 // The limit is not expected to be a practical limitation; it's only supposed
44 // to prevent attempts at overflowing size calculations. For both kinds of
45 // pathnames, separate limits could be used; a common limit is used purely for
48 #define VIRTIO_FS_MAX_PATHNAME_LENGTH ((UINTN)65535)
51 // Filesystem label encoded in UCS-2, transformed from the UTF-8 representation
52 // in "VIRTIO_FS_CONFIG.Tag", and NUL-terminated. Only the printable ASCII code
53 // points (U+0020 through U+007E) are supported.
55 typedef CHAR16 VIRTIO_FS_LABEL
[VIRTIO_FS_TAG_BYTES
+ 1];
58 // Main context structure, expressing an EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
59 // interface on top of the Virtio Filesystem device.
63 // Parts of this structure are initialized / torn down in various functions
64 // at various call depths. The table to the right should make it easier to
67 // field init function init depth
68 // ----------- ------------------ ----------
69 UINT64 Signature
; // DriverBindingStart 0
70 VIRTIO_DEVICE_PROTOCOL
*Virtio
; // DriverBindingStart 0
71 VIRTIO_FS_LABEL Label
; // VirtioFsInit 1
72 UINT16 QueueSize
; // VirtioFsInit 1
73 VRING Ring
; // VirtioRingInit 2
74 VOID
*RingMap
; // VirtioRingMap 2
75 UINT64 RequestId
; // FuseInitSession 1
76 EFI_EVENT ExitBoot
; // DriverBindingStart 0
77 LIST_ENTRY OpenFiles
; // DriverBindingStart 0
78 EFI_SIMPLE_FILE_SYSTEM_PROTOCOL SimpleFs
; // DriverBindingStart 0
81 #define VIRTIO_FS_FROM_SIMPLE_FS(SimpleFsReference) \
82 CR (SimpleFsReference, VIRTIO_FS, SimpleFs, VIRTIO_FS_SIG);
85 // Structure for describing a contiguous buffer, potentially mapped for Virtio
90 // The following fields originate from the owner of the buffer.
95 // All of the fields below, until the end of the structure, are
96 // zero-initialized when the structure is initially validated.
98 // Mapped, MappedAddress and Mapping are updated when the buffer is mapped
99 // for VirtioOperationBusMasterRead or VirtioOperationBusMasterWrite. They
100 // are again updated when the buffer is unmapped.
103 EFI_PHYSICAL_ADDRESS MappedAddress
;
106 // Transferred is updated after VirtioFlush() returns successfully:
107 // - for VirtioOperationBusMasterRead, Transferred is set to Size;
108 // - for VirtioOperationBusMasterWrite, Transferred is calculated from the
109 // UsedLen output parameter of VirtioFlush().
112 } VIRTIO_FS_IO_VECTOR
;
115 // Structure for describing a list of IO Vectors.
119 // The following fields originate from the owner of the buffers.
121 VIRTIO_FS_IO_VECTOR
*IoVec
;
124 // TotalSize is calculated when the scatter-gather list is initially
128 } VIRTIO_FS_SCATTER_GATHER_LIST
;
131 // Private context structure that exposes EFI_FILE_PROTOCOL on top of an open
132 // FUSE file reference.
136 EFI_FILE_PROTOCOL SimpleFile
;
138 BOOLEAN IsOpenForWriting
;
140 LIST_ENTRY OpenFilesEntry
;
141 CHAR8
*CanonicalPathname
;
143 // In the FUSE wire protocol, every request except FUSE_INIT refers to a
144 // file, namely by the "VIRTIO_FS_FUSE_REQUEST.NodeId" field; that is, by the
145 // inode number of the file. However, some of the FUSE requests that we need
146 // for some of the EFI_FILE_PROTOCOL member functions require an open file
147 // handle *in addition* to the inode number. For simplicity, whenever a
148 // VIRTIO_FS_FILE object is created, primarily defined by its NodeId field,
149 // we also *open* the referenced file at once, and save the returned file
150 // handle in the FuseHandle field. This way, when an EFI_FILE_PROTOCOL member
151 // function must send a FUSE request that needs the file handle *in addition*
152 // to the inode number, FuseHandle will be at our disposal at once.
158 #define VIRTIO_FS_FILE_FROM_SIMPLE_FILE(SimpleFileReference) \
159 CR (SimpleFileReference, VIRTIO_FS_FILE, SimpleFile, VIRTIO_FS_FILE_SIG);
161 #define VIRTIO_FS_FILE_FROM_OPEN_FILES_ENTRY(OpenFilesEntryReference) \
162 CR (OpenFilesEntryReference, VIRTIO_FS_FILE, OpenFilesEntry, \
166 // Initialization and helper routines for the Virtio Filesystem device.
171 IN OUT VIRTIO_FS
*VirtioFs
176 IN OUT VIRTIO_FS
*VirtioFs
182 IN EFI_EVENT ExitBootEvent
,
183 IN VOID
*VirtioFsAsVoid
187 VirtioFsSgListsValidate (
188 IN VIRTIO_FS
*VirtioFs
,
189 IN OUT VIRTIO_FS_SCATTER_GATHER_LIST
*RequestSgList
,
190 IN OUT VIRTIO_FS_SCATTER_GATHER_LIST
*ResponseSgList OPTIONAL
194 VirtioFsSgListsSubmit (
195 IN OUT VIRTIO_FS
*VirtioFs
,
196 IN OUT VIRTIO_FS_SCATTER_GATHER_LIST
*RequestSgList
,
197 IN OUT VIRTIO_FS_SCATTER_GATHER_LIST
*ResponseSgList OPTIONAL
201 VirtioFsFuseNewRequest (
202 IN OUT VIRTIO_FS
*VirtioFs
,
203 OUT VIRTIO_FS_FUSE_REQUEST
*Request
,
204 IN UINT32 RequestSize
,
205 IN VIRTIO_FS_FUSE_OPCODE Opcode
,
210 VirtioFsFuseCheckResponse (
211 IN VIRTIO_FS_SCATTER_GATHER_LIST
*ResponseSgList
,
213 OUT UINTN
*TailBufferFill
217 VirtioFsErrnoToEfiStatus (
224 IN CHAR16
*RhsPath16
,
225 OUT CHAR8
**ResultPath8
,
226 OUT BOOLEAN
*RootEscape
230 VirtioFsLookupMostSpecificParentDir (
231 IN OUT VIRTIO_FS
*VirtioFs
,
233 OUT UINT64
*DirNodeId
,
234 OUT CHAR8
**LastComponent
238 VirtioFsFuseAttrToEfiFileInfo (
239 IN VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE
*FuseAttr
,
240 OUT EFI_FILE_INFO
*FileInfo
244 // Wrapper functions for FUSE commands (primitives).
249 IN OUT VIRTIO_FS
*VirtioFs
,
253 OUT VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE
*FuseAttr
258 IN OUT VIRTIO_FS
*VirtioFs
,
264 IN OUT VIRTIO_FS
*VirtioFs
,
265 IN UINT64 ParentNodeId
,
272 IN OUT VIRTIO_FS
*VirtioFs
,
274 IN BOOLEAN ReadWrite
,
275 OUT UINT64
*FuseHandle
279 VirtioFsFuseReleaseFileOrDir (
280 IN OUT VIRTIO_FS
*VirtioFs
,
282 IN UINT64 FuseHandle
,
287 VirtioFsFuseFsyncFileOrDir (
288 IN OUT VIRTIO_FS
*VirtioFs
,
290 IN UINT64 FuseHandle
,
296 IN OUT VIRTIO_FS
*VirtioFs
,
302 VirtioFsFuseInitSession (
303 IN OUT VIRTIO_FS
*VirtioFs
307 VirtioFsFuseOpenDir (
308 IN OUT VIRTIO_FS
*VirtioFs
,
310 OUT UINT64
*FuseHandle
314 VirtioFsFuseOpenOrCreate (
315 IN OUT VIRTIO_FS
*VirtioFs
,
316 IN UINT64 ParentNodeId
,
319 OUT UINT64
*FuseHandle
323 // EFI_SIMPLE_FILE_SYSTEM_PROTOCOL member functions for the Virtio Filesystem
330 IN EFI_SIMPLE_FILE_SYSTEM_PROTOCOL
*This
,
331 OUT EFI_FILE_PROTOCOL
**Root
335 // EFI_FILE_PROTOCOL member functions for the Virtio Filesystem driver.
340 VirtioFsSimpleFileClose (
341 IN EFI_FILE_PROTOCOL
*This
346 VirtioFsSimpleFileDelete (
347 IN EFI_FILE_PROTOCOL
*This
352 VirtioFsSimpleFileFlush (
353 IN EFI_FILE_PROTOCOL
*This
358 VirtioFsSimpleFileGetInfo (
359 IN EFI_FILE_PROTOCOL
*This
,
360 IN EFI_GUID
*InformationType
,
361 IN OUT UINTN
*BufferSize
,
367 VirtioFsSimpleFileGetPosition (
368 IN EFI_FILE_PROTOCOL
*This
,
374 VirtioFsSimpleFileOpen (
375 IN EFI_FILE_PROTOCOL
*This
,
376 OUT EFI_FILE_PROTOCOL
**NewHandle
,
384 VirtioFsSimpleFileRead (
385 IN EFI_FILE_PROTOCOL
*This
,
386 IN OUT UINTN
*BufferSize
,
392 VirtioFsSimpleFileSetInfo (
393 IN EFI_FILE_PROTOCOL
*This
,
394 IN EFI_GUID
*InformationType
,
401 VirtioFsSimpleFileSetPosition (
402 IN EFI_FILE_PROTOCOL
*This
,
408 VirtioFsSimpleFileWrite (
409 IN EFI_FILE_PROTOCOL
*This
,
410 IN OUT UINTN
*BufferSize
,
414 #endif // VIRTIO_FS_DXE_H_