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- /** @file
- FUSE_OPENDIR 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_OPENDIR request to the Virtio Filesystem device, for opening a
- directory.
- 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_OPENDIR request to. On output, the FUSE request
- counter "VirtioFs->RequestId" will have been
- incremented.
- @param[in] NodeId The inode number of the directory to open.
- @param[out] FuseHandle The open file handle returned by the Virtio
- Filesystem device.
- @retval EFI_SUCCESS The directory has been opened.
- @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
- VirtioFsFuseOpenDir (
- IN OUT VIRTIO_FS *VirtioFs,
- IN UINT64 NodeId,
- OUT UINT64 *FuseHandle
- )
- {
- VIRTIO_FS_FUSE_REQUEST CommonReq;
- VIRTIO_FS_FUSE_OPEN_REQUEST OpenReq;
- VIRTIO_FS_IO_VECTOR ReqIoVec[2];
- VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
- VIRTIO_FS_FUSE_RESPONSE CommonResp;
- VIRTIO_FS_FUSE_OPEN_RESPONSE OpenResp;
- 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;
- ReqIoVec[1].Buffer = &OpenReq;
- ReqIoVec[1].Size = sizeof OpenReq;
- ReqSgList.IoVec = ReqIoVec;
- ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
- RespIoVec[0].Buffer = &CommonResp;
- RespIoVec[0].Size = sizeof CommonResp;
- RespIoVec[1].Buffer = &OpenResp;
- RespIoVec[1].Size = sizeof OpenResp;
- 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,
- VirtioFsFuseOpOpenDir,
- NodeId
- );
- if (EFI_ERROR (Status)) {
- return Status;
- }
- //
- // Populate the FUSE_OPENDIR-specific fields.
- //
- OpenReq.Flags = 0;
- OpenReq.Unused = 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 (EFI_ERROR (Status)) {
- 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;
- }
- //
- // Output the open file handle.
- //
- *FuseHandle = OpenResp.FileHandle;
- return EFI_SUCCESS;
- }
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