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OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_OPEN 

Add the VirtioFsFuseOpen() function, for sending the FUSE_OPEN command to
the Virtio Filesystem device.

Cc: Ard Biesheuvel <ard.biesheuvel@arm.com>
Cc: Jordan Justen <jordan.l.justen@intel.com>
Cc: Philippe Mathieu-Daudé <philmd@redhat.com>
Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3097
Signed-off-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20201216211125.19496-19-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
This commit is contained in:
Laszlo Ersek 2020-12-16 22:10:55 +01:00 committed by mergify[bot]
parent 7e8c83f7d4
commit da82d2e3a0
4 changed files with 156 additions and 14 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

35
OvmfPkg/Include/IndustryStandard/VirtioFs.h
View File

@ -81,11 +81,18 @@ typedef struct {
//
#define VIRTIO_FS_FUSE_ROOT_DIR_NODE_ID 1
//
// Flags for VirtioFsFuseOpOpen.
//
#define VIRTIO_FS_FUSE_OPEN_REQ_F_RDONLY 0
#define VIRTIO_FS_FUSE_OPEN_REQ_F_RDWR 2
//
// FUSE operation codes.
//
typedef enum {
VirtioFsFuseOpForget = 2,
VirtioFsFuseOpOpen = 14,
VirtioFsFuseOpRelease = 18,
VirtioFsFuseOpFsync = 20,
VirtioFsFuseOpFlush = 25,
@ -123,6 +130,20 @@ typedef struct {
UINT64 NumberOfLookups;
} VIRTIO_FS_FUSE_FORGET_REQUEST;
//
// Headers for VirtioFsFuseOpOpen and VirtioFsFuseOpOpenDir.
//
typedef struct {
UINT32 Flags;
UINT32 Unused;
} VIRTIO_FS_FUSE_OPEN_REQUEST;
typedef struct {
UINT64 FileHandle;
UINT32 OpenFlags;
UINT32 Padding;
} VIRTIO_FS_FUSE_OPEN_RESPONSE;
//
// Header for VirtioFsFuseOpRelease and VirtioFsFuseOpReleaseDir.
//
@ -175,20 +196,6 @@ typedef struct {
UINT16 MapAlignment;
UINT32 Unused[8];
} VIRTIO_FS_FUSE_INIT_RESPONSE;
//
// Headers for VirtioFsFuseOpOpenDir.
//
typedef struct {
UINT32 Flags;
UINT32 Unused;
} VIRTIO_FS_FUSE_OPEN_REQUEST;
typedef struct {
UINT64 FileHandle;
UINT32 OpenFlags;
UINT32 Padding;
} VIRTIO_FS_FUSE_OPEN_RESPONSE;
#pragma pack ()
#endif // VIRTIO_FS_H_

126
OvmfPkg/VirtioFsDxe/FuseOpen.c Normal file
View File

@ -0,0 +1,126 @@
/** @file
FUSE_OPEN wrapper for the Virtio Filesystem device.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "VirtioFsDxe.h"
/**
Send a FUSE_OPEN request to the Virtio Filesystem device, for opening a
regular file.
The function may only be called after VirtioFsFuseInitSession() returns
successfully and before VirtioFsUninit() is called.
@param[in,out] VirtioFs The Virtio Filesystem device to send the FUSE_OPEN
request to. On output, the FUSE request counter
"VirtioFs->RequestId" will have been incremented.
@param[in] NodeId The inode number of the regular file to open.
@param[in] ReadWrite If TRUE, open the regular file in read-write mode.
If FALSE, open the regular file in read-only mode.
@param[out] FuseHandle The open handle to the regular file, returned by the
Virtio Filesystem device.
@retval EFI_SUCCESS The regular file has been opened.
@return The "errno" value mapped to an EFI_STATUS code, if the
Virtio Filesystem device explicitly reported an error.
@return Error codes propagated from VirtioFsSgListsValidate(),
VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit(),
VirtioFsFuseCheckResponse().
**/
EFI_STATUS
VirtioFsFuseOpen (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN BOOLEAN ReadWrite,
OUT UINT64 *FuseHandle
)
{
VIRTIO_FS_FUSE_REQUEST CommonReq;
VIRTIO_FS_FUSE_OPEN_REQUEST OpenReq;
VIRTIO_FS_IO_VECTOR ReqIoVec[2];
VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
VIRTIO_FS_FUSE_RESPONSE CommonResp;
VIRTIO_FS_FUSE_OPEN_RESPONSE OpenResp;
VIRTIO_FS_IO_VECTOR RespIoVec[2];
VIRTIO_FS_SCATTER_GATHER_LIST RespSgList;
EFI_STATUS Status;
//
// Set up the scatter-gather lists.
//
ReqIoVec[0].Buffer = &CommonReq;
ReqIoVec[0].Size = sizeof CommonReq;
ReqIoVec[1].Buffer = &OpenReq;
ReqIoVec[1].Size = sizeof OpenReq;
ReqSgList.IoVec = ReqIoVec;
ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
RespIoVec[0].Buffer = &CommonResp;
RespIoVec[0].Size = sizeof CommonResp;
RespIoVec[1].Buffer = &OpenResp;
RespIoVec[1].Size = sizeof OpenResp;
RespSgList.IoVec = RespIoVec;
RespSgList.NumVec = ARRAY_SIZE (RespIoVec);
//
// Validate the scatter-gather lists; calculate the total transfer sizes.
//
Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, &RespSgList);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Populate the common request header.
//
Status = VirtioFsFuseNewRequest (VirtioFs, &CommonReq, ReqSgList.TotalSize,
VirtioFsFuseOpOpen, NodeId);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Populate the FUSE_OPEN-specific fields.
//
OpenReq.Flags = (ReadWrite ?
VIRTIO_FS_FUSE_OPEN_REQ_F_RDWR :
VIRTIO_FS_FUSE_OPEN_REQ_F_RDONLY);
OpenReq.Unused = 0;
//
// Submit the request.
//
Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, &RespSgList);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Verify the response (all response buffers are fixed size).
//
Status = VirtioFsFuseCheckResponse (&RespSgList, CommonReq.Unique, NULL);
if (EFI_ERROR (Status)) {
if (Status == EFI_DEVICE_ERROR) {
DEBUG ((DEBUG_ERROR, "%a: Label=\"%s\" NodeId=%Lu ReadWrite=%d "
"Errno=%d\n", __FUNCTION__, VirtioFs->Label, NodeId, ReadWrite,
CommonResp.Error));
Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
}
return Status;
}
//
// Output the open handle.
//
*FuseHandle = OpenResp.FileHandle;
return EFI_SUCCESS;
}

8
OvmfPkg/VirtioFsDxe/VirtioFsDxe.h
View File

@ -235,6 +235,14 @@ VirtioFsFuseForget (
IN UINT64 NodeId
);
EFI_STATUS
VirtioFsFuseOpen (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN BOOLEAN ReadWrite,
OUT UINT64 *FuseHandle
);
EFI_STATUS
VirtioFsFuseReleaseFileOrDir (
IN OUT VIRTIO_FS *VirtioFs,

1
OvmfPkg/VirtioFsDxe/VirtioFsDxe.inf
View File

@ -86,6 +86,7 @@
FuseForget.c
FuseFsync.c
FuseInit.c
FuseOpen.c
FuseOpenDir.c
FuseRelease.c
Helpers.c