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/** @file
FUSE_STATFS wrapper for the Virtio Filesystem device.
Copyright (C) 2020, Red Hat, Inc.
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include "VirtioFsDxe.h"
/**
Send the FUSE_STATFS request to the Virtio Filesysem device, for retrieving
the attributes of the host-side filesystem that contains NodeId.
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_STATFS
request to. On output, the FUSE request counter
"VirtioFs->RequestId" will have been incremented.
@param[in] NodeId The inode whose containing filesystem is to be
queried for its attributes.
@param[out] FilesysAttr The VIRTIO_FS_FUSE_STATFS_RESPONSE object describing
the filesystem that underlies NodeId.
@retval EFI_SUCCESS FilesysAttr has been filled in.
@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
VirtioFsFuseStatFs (
IN OUT VIRTIO_FS *VirtioFs,
IN UINT64 NodeId,
OUT VIRTIO_FS_FUSE_STATFS_RESPONSE *FilesysAttr
)
{
VIRTIO_FS_FUSE_REQUEST CommonReq;
VIRTIO_FS_IO_VECTOR ReqIoVec[1];
VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
VIRTIO_FS_FUSE_RESPONSE CommonResp;
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;
ReqSgList.IoVec = ReqIoVec;
ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
RespIoVec[0].Buffer = &CommonResp;
RespIoVec[0].Size = sizeof CommonResp;
RespIoVec[1].Buffer = FilesysAttr;
RespIoVec[1].Size = sizeof *FilesysAttr;
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,
VirtioFsFuseOpStatFs, NodeId);
if (EFI_ERROR (Status)) {
return Status;
}
//
// 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 Errno=%d\n",
__FUNCTION__, VirtioFs->Label, NodeId, CommonResp.Error));
Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
}
return Status;
}
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