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/** @file
FUSE_WRITE wrapper for the Virtio Filesystem device.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "VirtioFsDxe.h"
/**
Write a chunk to a regular file, by sending the FUSE_WRITE 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_WRITE
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 write to.
@param[in] FuseHandle The open handle to the regular file to write to.
@param[in] Offset The absolute file position at which to start
writing.
@param[in,out] Size On input, the number of bytes to write. On
successful return, the number of bytes actually
written, which may be smaller than the value on
input.
@param[in] Data The buffer to write to the regular file.
@retval EFI_SUCCESS Write successful. The caller is responsible for
checking Size to learn the actual byte count
transferred.
@retval EFI_BAD_BUFFER_SIZE On input, Size is larger than
"VirtioFs->MaxWrite".
@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
VirtioFsFuseWrite (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
IN UINT64 FuseHandle,
IN UINT64 Offset,
IN OUT UINT32 *Size,
IN VOID *Data
)
{
VIRTIO_FS_FUSE_REQUEST CommonReq;
VIRTIO_FS_FUSE_WRITE_REQUEST WriteReq;
VIRTIO_FS_IO_VECTOR ReqIoVec[3];
VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
VIRTIO_FS_FUSE_RESPONSE CommonResp;
VIRTIO_FS_FUSE_WRITE_RESPONSE WriteResp;
VIRTIO_FS_IO_VECTOR RespIoVec[2];
VIRTIO_FS_SCATTER_GATHER_LIST RespSgList;
EFI_STATUS Status;
//
// Honor the write buffer size limit of the Virtio Filesystem device.
//
if (*Size > VirtioFs->MaxWrite) {
return EFI_BAD_BUFFER_SIZE;
}
//
// Set up the scatter-gather lists.
//
ReqIoVec[0].Buffer = &CommonReq;
ReqIoVec[0].Size = sizeof CommonReq;
ReqIoVec[1].Buffer = &WriteReq;
ReqIoVec[1].Size = sizeof WriteReq;
ReqIoVec[2].Buffer = Data;
ReqIoVec[2].Size = *Size;
ReqSgList.IoVec = ReqIoVec;
ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
RespIoVec[0].Buffer = &CommonResp;
RespIoVec[0].Size = sizeof CommonResp;
RespIoVec[1].Buffer = &WriteResp;
RespIoVec[1].Size = sizeof WriteResp;
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,
VirtioFsFuseOpWrite, NodeId);
if (EFI_ERROR (Status)) {
return Status;
}
//
// Populate the FUSE_WRITE-specific fields.
//
WriteReq.FileHandle = FuseHandle;
WriteReq.Offset = Offset;
WriteReq.Size = *Size;
WriteReq.WriteFlags = 0;
WriteReq.LockOwner = 0;
WriteReq.Flags = 0;
WriteReq.Padding = 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 FuseHandle=%Lu "
"Offset=0x%Lx Size=0x%x Data@%p Errno=%d\n", __FUNCTION__,
VirtioFs->Label, NodeId, FuseHandle, Offset, *Size, Data,
CommonResp.Error));
Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
}
return Status;
}
//
// Report the actual transfer size.
//
*Size = WriteResp.Size;
return EFI_SUCCESS;
}
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