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- /** @file
- FUSE_FORGET wrapper for the Virtio Filesystem device.
- Copyright (C) 2020, Red Hat, Inc.
- SPDX-License-Identifier: BSD-2-Clause-Patent
- **/
- #include "VirtioFsDxe.h"
- /**
- Make the Virtio Filesysem device drop one reference count from a NodeId that
- the driver looked up by filename.
- Send the FUSE_FORGET request to the Virtio Filesysem device for this. Unlike
- most other FUSE requests, FUSE_FORGET doesn't elicit a response, not even the
- common VIRTIO_FS_FUSE_RESPONSE header.
- 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_FORGET
- request to. On output, the FUSE request counter
- "VirtioFs->RequestId" will have been incremented.
- @param[in] NodeId The inode number that the client learned by way of
- lookup, and that the server should now un-reference
- exactly once.
- @retval EFI_SUCCESS The FUSE_FORGET request has been submitted.
- @return Error codes propagated from VirtioFsSgListsValidate(),
- VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit().
- **/
- EFI_STATUS
- VirtioFsFuseForget (
- IN OUT VIRTIO_FS *VirtioFs,
- IN UINT64 NodeId
- )
- {
- VIRTIO_FS_FUSE_REQUEST CommonReq;
- VIRTIO_FS_FUSE_FORGET_REQUEST ForgetReq;
- VIRTIO_FS_IO_VECTOR ReqIoVec[2];
- VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
- EFI_STATUS Status;
- //
- // Set up the scatter-gather list (note: only request).
- //
- ReqIoVec[0].Buffer = &CommonReq;
- ReqIoVec[0].Size = sizeof CommonReq;
- ReqIoVec[1].Buffer = &ForgetReq;
- ReqIoVec[1].Size = sizeof ForgetReq;
- ReqSgList.IoVec = ReqIoVec;
- ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
- //
- // Validate the scatter-gather list (request only); calculate the total
- // transfer size.
- //
- Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, NULL);
- if (EFI_ERROR (Status)) {
- return Status;
- }
- //
- // Populate the common request header.
- //
- Status = VirtioFsFuseNewRequest (
- VirtioFs,
- &CommonReq,
- ReqSgList.TotalSize,
- VirtioFsFuseOpForget,
- NodeId
- );
- if (EFI_ERROR (Status)) {
- return Status;
- }
- //
- // Populate the FUSE_FORGET-specific fields.
- //
- ForgetReq.NumberOfLookups = 1;
- //
- // Submit the request. There's not going to be a response.
- //
- Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, NULL);
- return Status;
- }
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