/** @file | |
FUSE_GETATTR 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_GETATTR request to the Virtio Filesystem device, for fetching the | |
attributes of an inode. | |
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_GETATTR request to. On output, the FUSE request | |
counter "VirtioFs->RequestId" will have been | |
incremented. | |
@param[in] NodeId The inode number for which the attributes should be | |
retrieved. | |
@param[out] FuseAttr The VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE object | |
describing the properties of the inode. | |
@retval EFI_SUCCESS FuseAttr 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 | |
VirtioFsFuseGetAttr ( | |
IN OUT VIRTIO_FS *VirtioFs, | |
IN UINT64 NodeId, | |
OUT VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr | |
) | |
{ | |
VIRTIO_FS_FUSE_REQUEST CommonReq; | |
VIRTIO_FS_FUSE_GETATTR_REQUEST GetAttrReq; | |
VIRTIO_FS_IO_VECTOR ReqIoVec[2]; | |
VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList; | |
VIRTIO_FS_FUSE_RESPONSE CommonResp; | |
VIRTIO_FS_FUSE_GETATTR_RESPONSE GetAttrResp; | |
VIRTIO_FS_IO_VECTOR RespIoVec[3]; | |
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 = &GetAttrReq; | |
ReqIoVec[1].Size = sizeof GetAttrReq; | |
ReqSgList.IoVec = ReqIoVec; | |
ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec); | |
RespIoVec[0].Buffer = &CommonResp; | |
RespIoVec[0].Size = sizeof CommonResp; | |
RespIoVec[1].Buffer = &GetAttrResp; | |
RespIoVec[1].Size = sizeof GetAttrResp; | |
RespIoVec[2].Buffer = FuseAttr; | |
RespIoVec[2].Size = sizeof *FuseAttr; | |
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, | |
VirtioFsFuseOpGetAttr, | |
NodeId | |
); | |
if (EFI_ERROR (Status)) { | |
return Status; | |
} | |
// | |
// Populate the FUSE_GETATTR-specific fields. | |
// | |
GetAttrReq.GetAttrFlags = 0; | |
GetAttrReq.Dummy = 0; | |
GetAttrReq.FileHandle = 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 Errno=%d\n", | |
__func__, | |
VirtioFs->Label, | |
NodeId, | |
CommonResp.Error | |
)); | |
Status = VirtioFsErrnoToEfiStatus (CommonResp.Error); | |
} | |
return Status; | |
} |