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/** @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;
}
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