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140 lines
4.0 KiB
C
140 lines
4.0 KiB
C
/** @file
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FUSE_OPEN 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_OPEN request to the Virtio Filesystem device, for opening a
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regular file.
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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 FUSE_OPEN
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request to. On output, the FUSE request counter
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"VirtioFs->RequestId" will have been incremented.
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@param[in] NodeId The inode number of the regular file to open.
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@param[in] ReadWrite If TRUE, open the regular file in read-write mode.
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If FALSE, open the regular file in read-only mode.
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@param[out] FuseHandle The open handle to the regular file, returned by the
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Virtio Filesystem device.
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@retval EFI_SUCCESS The regular file has been opened.
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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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VirtioFsFuseOpen (
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IN OUT VIRTIO_FS *VirtioFs,
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IN UINT64 NodeId,
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IN BOOLEAN ReadWrite,
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OUT UINT64 *FuseHandle
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)
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{
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VIRTIO_FS_FUSE_REQUEST CommonReq;
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VIRTIO_FS_FUSE_OPEN_REQUEST OpenReq;
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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_OPEN_RESPONSE OpenResp;
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VIRTIO_FS_IO_VECTOR RespIoVec[2];
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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 = &OpenReq;
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ReqIoVec[1].Size = sizeof OpenReq;
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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 = &OpenResp;
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RespIoVec[1].Size = sizeof OpenResp;
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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 (
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VirtioFs,
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&CommonReq,
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ReqSgList.TotalSize,
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VirtioFsFuseOpOpen,
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NodeId
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);
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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_OPEN-specific fields.
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//
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OpenReq.Flags = (ReadWrite ?
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VIRTIO_FS_FUSE_OPEN_REQ_F_RDWR :
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VIRTIO_FS_FUSE_OPEN_REQ_F_RDONLY);
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OpenReq.Unused = 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 (EFI_ERROR (Status)) {
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if (Status == EFI_DEVICE_ERROR) {
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DEBUG ((
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DEBUG_ERROR,
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"%a: Label=\"%s\" NodeId=%Lu ReadWrite=%d "
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"Errno=%d\n",
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__func__,
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VirtioFs->Label,
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NodeId,
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ReadWrite,
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CommonResp.Error
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));
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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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//
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// Output the open handle.
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//
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*FuseHandle = OpenResp.FileHandle;
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return EFI_SUCCESS;
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}
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