mirror of https://github.com/acidanthera/audk.git
117 lines
3.7 KiB
C
117 lines
3.7 KiB
C
/** @file
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FUSE_GETATTR wrapper for the Virtio Filesystem device.
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Copyright (C) 2020, Red Hat, Inc.
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SPDX-License-Identifier: BSD-2-Clause-Patent
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**/
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#include "VirtioFsDxe.h"
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/**
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Send a FUSE_GETATTR request to the Virtio Filesystem device, for fetching the
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attributes of an inode.
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The function may only be called after VirtioFsFuseInitSession() returns
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successfully and before VirtioFsUninit() is called.
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@param[in,out] VirtioFs The Virtio Filesystem device to send the
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FUSE_GETATTR request to. On output, the FUSE request
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counter "VirtioFs->RequestId" will have been
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incremented.
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@param[in] NodeId The inode number for which the attributes should be
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retrieved.
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@param[out] FuseAttr The VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE object
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describing the properties of the inode.
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@retval EFI_SUCCESS FuseAttr has been filled in.
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@return The "errno" value mapped to an EFI_STATUS code, if the
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Virtio Filesystem device explicitly reported an error.
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@return Error codes propagated from VirtioFsSgListsValidate(),
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VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit(),
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VirtioFsFuseCheckResponse().
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**/
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EFI_STATUS
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VirtioFsFuseGetAttr (
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IN OUT VIRTIO_FS *VirtioFs,
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IN UINT64 NodeId,
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OUT VIRTIO_FS_FUSE_ATTRIBUTES_RESPONSE *FuseAttr
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)
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{
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VIRTIO_FS_FUSE_REQUEST CommonReq;
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VIRTIO_FS_FUSE_GETATTR_REQUEST GetAttrReq;
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VIRTIO_FS_IO_VECTOR ReqIoVec[2];
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VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
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VIRTIO_FS_FUSE_RESPONSE CommonResp;
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VIRTIO_FS_FUSE_GETATTR_RESPONSE GetAttrResp;
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VIRTIO_FS_IO_VECTOR RespIoVec[3];
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VIRTIO_FS_SCATTER_GATHER_LIST RespSgList;
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EFI_STATUS Status;
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//
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// Set up the scatter-gather lists.
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//
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ReqIoVec[0].Buffer = &CommonReq;
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ReqIoVec[0].Size = sizeof CommonReq;
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ReqIoVec[1].Buffer = &GetAttrReq;
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ReqIoVec[1].Size = sizeof GetAttrReq;
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ReqSgList.IoVec = ReqIoVec;
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ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
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RespIoVec[0].Buffer = &CommonResp;
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RespIoVec[0].Size = sizeof CommonResp;
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RespIoVec[1].Buffer = &GetAttrResp;
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RespIoVec[1].Size = sizeof GetAttrResp;
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RespIoVec[2].Buffer = FuseAttr;
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RespIoVec[2].Size = sizeof *FuseAttr;
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RespSgList.IoVec = RespIoVec;
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RespSgList.NumVec = ARRAY_SIZE (RespIoVec);
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//
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// Validate the scatter-gather lists; calculate the total transfer sizes.
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//
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Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, &RespSgList);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Populate the common request header.
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//
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Status = VirtioFsFuseNewRequest (VirtioFs, &CommonReq, ReqSgList.TotalSize,
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VirtioFsFuseOpGetAttr, NodeId);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Populate the FUSE_GETATTR-specific fields.
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//
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GetAttrReq.GetAttrFlags = 0;
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GetAttrReq.Dummy = 0;
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GetAttrReq.FileHandle = 0;
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//
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// Submit the request.
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//
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Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, &RespSgList);
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if (EFI_ERROR (Status)) {
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return Status;
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}
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//
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// Verify the response (all response buffers are fixed size).
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//
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Status = VirtioFsFuseCheckResponse (&RespSgList, CommonReq.Unique, NULL);
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if (Status == EFI_DEVICE_ERROR) {
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DEBUG ((DEBUG_ERROR, "%a: Label=\"%s\" NodeId=%Lu Errno=%d\n",
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__FUNCTION__, VirtioFs->Label, NodeId, CommonResp.Error));
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Status = VirtioFsErrnoToEfiStatus (CommonResp.Error);
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}
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return Status;
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}
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