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OvmfPkg/VirtioFsDxe: implement the wrapper function for FUSE_FLUSH

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Add the VirtioFsFuseFlush() function, for sending the FUSE_FLUSH 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: <20201216211125.19496-15-lersek@redhat.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@arm.com>
This commit is contained in:
Laszlo Ersek
2020-12-16 22:10:51 +01:00
committed by mergify[bot]
parent 2e151d26ca
commit d047439952
4 changed files with 130 additions and 0 deletions
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111
OvmfPkg/VirtioFsDxe/FuseFlush.c Normal file
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/** @file
FUSE_FLUSH wrapper for the Virtio Filesystem device.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "VirtioFsDxe.h"
/**
Flush changes queued on the local virtualization host to the remote storage
server's memory (not storage device), over the network, by sending the
FUSE_FLUSH request to the Virtio Filesystem device.
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_FLUSH
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 flush.
@param[in] FuseHandle The open handle to the regular file to flush.
@retval EFI_SUCCESS The regular file has been flushed.
@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
VirtioFsFuseFlush (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN UINT64 FuseHandle
)
{
VIRTIO_FS_FUSE_REQUEST CommonReq;
VIRTIO_FS_FUSE_FLUSH_REQUEST FlushReq;
VIRTIO_FS_IO_VECTOR ReqIoVec[2];
VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
VIRTIO_FS_FUSE_RESPONSE CommonResp;
VIRTIO_FS_IO_VECTOR RespIoVec[1];
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 = &FlushReq;
ReqIoVec[1].Size = sizeof FlushReq;
ReqSgList.IoVec = ReqIoVec;
ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
RespIoVec[0].Buffer = &CommonResp;
RespIoVec[0].Size = sizeof CommonResp;
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,
VirtioFsFuseOpFlush, NodeId);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Populate the FUSE_FLUSH-specific fields.
//
FlushReq.FileHandle = FuseHandle;
FlushReq.Unused = 0;
FlushReq.Padding = 0;
FlushReq.LockOwner = 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 (Status == EFI_DEVICE_ERROR) {
DEBUG ((DEBUG_ERROR, "%a: Label=\"%s\" NodeId=%Lu FuseHandle=%Lu "
"Errno=%d\n", __FUNCTION__, VirtioFs->Label, NodeId, FuseHandle,
CommonResp.Error));
Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
}
return Status;
}