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https://github.com/CloverHackyColor/CloverBootloader.git
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91 lines
2.7 KiB
C
91 lines
2.7 KiB
C
/** @file
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FUSE_FORGET 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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Make the Virtio Filesysem device drop one reference count from a NodeId that
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the driver looked up by filename.
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Send the FUSE_FORGET request to the Virtio Filesysem device for this. Unlike
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most other FUSE requests, FUSE_FORGET doesn't elicit a response, not even the
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common VIRTIO_FS_FUSE_RESPONSE header.
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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_FORGET
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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 that the client learned by way of
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lookup, and that the server should now un-reference
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exactly once.
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@retval EFI_SUCCESS The FUSE_FORGET request has been submitted.
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@return Error codes propagated from VirtioFsSgListsValidate(),
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VirtioFsFuseNewRequest(), VirtioFsSgListsSubmit().
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**/
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EFI_STATUS
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VirtioFsFuseForget (
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IN OUT VIRTIO_FS *VirtioFs,
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IN UINT64 NodeId
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)
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{
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VIRTIO_FS_FUSE_REQUEST CommonReq;
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VIRTIO_FS_FUSE_FORGET_REQUEST ForgetReq;
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VIRTIO_FS_IO_VECTOR ReqIoVec[2];
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VIRTIO_FS_SCATTER_GATHER_LIST ReqSgList;
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EFI_STATUS Status;
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//
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// Set up the scatter-gather list (note: only request).
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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 = &ForgetReq;
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ReqIoVec[1].Size = sizeof ForgetReq;
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ReqSgList.IoVec = ReqIoVec;
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ReqSgList.NumVec = ARRAY_SIZE (ReqIoVec);
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//
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// Validate the scatter-gather list (request only); calculate the total
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// transfer size.
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//
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Status = VirtioFsSgListsValidate (VirtioFs, &ReqSgList, NULL);
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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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VirtioFsFuseOpForget,
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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_FORGET-specific fields.
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//
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ForgetReq.NumberOfLookups = 1;
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//
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// Submit the request. There's not going to be a response.
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//
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Status = VirtioFsSgListsSubmit (VirtioFs, &ReqSgList, NULL);
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return Status;
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}
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